Design, manufacture, testing and commissioning of 45mva 132/22kV class 1 power transformers for ESKOM distribution (5-year as-and-when contract)

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an as-and-when required basis over a five-year period for Eskom's distribution division. The specific unit covered by this document is a 20MVA, 33/11kV YNyn0 power transformer.

Returnable documents — all must be completed, signed and submitted with the bid:

• Technical Schedules A and B for the 20MVA, 33/11kV YNyn0 power transformer.
• Deviation Schedule listing any proposed deviations with reasons and evidence that each deviation is more cost-effective than the specified requirement.
• Design Parameter Schedule.
• General Information Schedule.
• Type test and routine test certificates.
• Detailed list of recommended spares.
• The tender document must be signed by the supplier, factory and Eskom representatives.

Disqualification risks:

• Incomplete or unsigned returnable documents.
• Deviations offered without supporting evidence of cost-effectiveness.

Bidders must complete and submit the Technical Schedules A and B, the Deviation Schedule, the Design Parameter Schedule, and the General Information Schedule. Bidders must provide evidence of compliance with the specified technical requirements, including guaranteed losses and impedance. Bidders must submit type test and routine test certificates. Bidders must provide a detailed list of recommended spares. Bidders must sign the tender document. No specific eligibility criteria such as CSD registration, B-BBEE, or CIDB grading are mentioned in the provided content.

Scope: Supply of a 20MVA, 33/11kV YNyn0 power transformer, Class 1, on an as-and-when required basis over a five-year period.

Key technical requirements:

• Continuous rated power: 20 MVA ONAN; ONAF not applicable.
• Rated voltages: primary 33 kV r.m.s, secondary 11 kV r.m.s.
• Voltage tapping range: +5% to -15% of principal tapping ratio, in steps of 1.25%, with 17 positions including transition positions.
• Vector group: YNyn0; core type; 3 limbs; ONAN cooling.
• Operating environment: very heavy pollution level; corrosion protection per Eskom specification 240-56030674.
• Impedance at 75°C on principal tapping: 6%; on extreme minus tapping: >5%; tolerances per IEC, with +10%/-0% on extreme minus tapping.
• Temperature rises at altitude 1,800 m: top oil 55°K, windings 60°K, hotspot of winding <73°K, hotspot of metal parts in contact with oil <80°K.
• Maximum acoustic noise: 71 dB(A).
• Heavy duty type: yes.
• Insulation levels: impulse withstand for primary 200 kV peak, secondary 95 kV peak; 60-second separate source primary 70 kV r.m.s, secondary 28 kV r.m.s; induced-overvoltage primary to earth 66 kV r.m.s, secondary 22 kV r.m.s.
• Main terminals and bushings: outdoor type; primary bushing stem 38 x 125 mm, impulse withstand 250 kV peak, power frequency withstand 95 kV r.m.s, total creepage 1,612 mm; secondary bushing stem 26 x 125 mm, impulse withstand 200 kV peak, power frequency withstand 70 kV r.m.s, total creepage 1,116 mm; neutral bushing stem 38 x 125 mm, impulse withstand 250 kV peak, power frequency withstand 95 kV r.m.s, total creepage 1,612 mm.
• Physical arrangement: compliance with figures 2 and 3; overall dimensions height 5,500 mm, length 6,400 mm, width 5,000 mm.
• Safe withstand vacuum at sea level: 1.5 kPa.
• Transformer oil type: per Eskom specification 240-75661431.
• Tap-changer: OLTC, Y-neutral end, 300,000 maintenance-free operations; nominal 50 Hz ratings voltage 33 kV; insulation levels phase-to-phase 200 kV peak; 50 Hz withstand phase-to-phase 70 kV r.m.s; driving motor 3-phase, 400 V a.c.
• Indicating and protective devices: pressure relief device per Eskom specification 240-56063871; oil- and gas-actuated relay per Eskom specification 240-56063908; no conservator bag required; dehydrating breathers per Eskom specification 240-56062529; oil level indicators per specification 240-56356191; oil and winding temperature thermometers digital plus analogue.
• Losses: no plus tolerance allowed; no-load losses at 90%, 100% and 110% of rated power (100% value used in financial evaluation); load losses at extreme plus, nominal and extreme minus tap positions (average of the three used for loss evaluation).
• Maximum current density in windings: to be stated by bidder.
• Core steel, core dimensions, winding design, inter-winding insulation and other design parameters: to be completed in the Design Parameter Schedule.
• Oil quantities, masses, zero sequence impedances, transport filling medium and training details: to be completed in the General Information Schedule.
• Delivery and off-loading: transformer delivered to works info; supplier off-loads and transfers to operating position; rise/fall to off-loading position 500 mm; impact recorders on tank.
• Erection: erected ready for service; 4 layers x 4 mm (total 16 mm) of Malthoid required.
• Tests: type tests for first-of-design units (temperature rise, acoustic noise); routine tests include lightning impulse, capacitances, short duration AC with partial discharge, zero sequence impedance, and low voltage tests (frequency response analysis, ratio, magnetisation, impedance on all tap positions, winding DC resistance, bushing tan delta, overall winding insulation, insulation resistance, CT magnetisation and ratio).

Loss evaluation will be performed using the average of the three load loss values (extreme plus, nominal, extreme minus tap positions). The no-load loss value at 100% rated power will be used in financial evaluation. No plus tolerance allowed on losses.

No specific compliance requirements such as CSD registration, B-BBEE, or CIDB grading are mentioned in the provided content.

The tender covers the full lifecycle of Class 1 power transformers for Eskom's Distribution Division, from design and engineering through manufacture, testing, supply, shipping, transportation, delivery, installation, erection, site-testing, and commissioning. The contract operates on an as-and-when required basis over a five-year period.

Clarification meeting (non-compulsory): 26 August 2026 at 11h00 via MS Teams. Meeting link: https://teams.microsoft.com/meet/380420127532682?p=3Okt4nODymuBXm6qaW; Meeting ID: 380 420 127 532 682; Passcode: HU2pk7ec. Contact Eugene Labuschagne at [email protected] if unable to access.

Clarification queries must be submitted 5 working days before the tender submission deadline.

Tender validity period: 54 weeks from the closing date and time.

Eskom Representative: Eugene Labuschagne

Tel: 021 980 3570

E-mail: [email protected]

All queries and clarifications must be addressed in writing to the Eskom Representative. No other Eskom official may be contacted.

Tenders must be submitted electronically via the Eskom E-tendering site by the closing date and time. No hard copies will be accepted. Documents must be uploaded in PDF format, with a maximum upload size of 500 megabytes per document and a total submission limit of 4 gigabytes. No zip or compressed files may be uploaded. If a tender is resubmitted, only the latest version will be accepted. The submission status must be indicated as complete. Late tenders will not be accepted.

Returnable documents required at tender closing (disqualifiable if not submitted):

• Annexure A: Authorisation Form (with certified resolution or power of attorney as applicable)
• Annexure B: Acknowledgement Form
• Annexure C: Tenderer's Particulars
• Annexure D: Integrity Pact Declaration Form
• Annexure G1-G4: SBD 6.2 Declaration Certificate for Local Production and Content, including Annexures C, D, and E
• Annexure H: SBD 1 Invitation to Bid
• Annexure J: SBD 4 Bidders Disclosure
• E-tendering Help Manual acknowledgement form

Returnables required at tender closing (non-disqualifiable, but must be submitted within 5 working days if requested):

• Tax clearance certificate (for tenderers not providing a SARS e-filing PIN or CSD number)
• Tax Evaluation Questionnaire (if applicable)
• Proof of compliance with Employment Equity Act (for designated employers)
• NEC3 ECC Contract completed in full

Returnables required prior to contract award:

• CSD registration (CSD number or CSD report)
• Safety documents: COIDA certificate, OHS plan, costing for SHE management, Baseline Risk Assessment, SHE policy, SHE competency CVs, OHS policy, safe work procedure for transformer installation, loading and offloading procedure
• Quality documents: ISO 9001 certification, evidence of QMS in operation, draft contract/project quality plan, draft Inspection and Test Plan or Quality Control Plan, Form A
• Environmental documents: Environmental Policy, organogram, appointment letter, competence training records, aspects and impacts register, waste management plan, emergency preparedness and response plan, risk register, objectives and targets register, environmental management plan, ES past performance declaration, incident register, MSDS for hazardous substances

Additional documents for joint ventures: letter of intent or valid JV agreement, confirmation of single business entity, details of a single designated bank account.

Disqualification risks: failure to submit any disqualifiable returnable, submitting more than one tender, subcontracting 100% of the scope, being on any restricted or defaulters list, having a conflict of interest, or being of a nationality on an international sanctions list.

This is a two-stage pre-qualification process.

Stage 1: Pre-Qualification

• Tenderers are assessed against basic compliance, mandatory requirements, technical/functionality compliance, objective criteria (designated sectors), and contractual compliance (SHEQ).
• Suppliers meeting all technical and contractual requirements are listed on the Technically Evaluated and Accepted Products (TEAP) Distribution Database.
• Technical evaluation is based on the technical evaluation criteria for power transformers (document 240-171000616 Rev 1).
• Bidders must meet all mandatory requirements and score a minimum of 80 points out of the discretionary requirements.
• Factory assessment will be conducted on all suppliers passing the technical threshold. If the tenderer is not the OEM, the factory evaluation will take place at the nominated factory.
• Price is not evaluated in Stage 1.

Stage 2: Closed Competitive RFQ Process

• Pre-qualified suppliers are invited to participate in closed competitive Requests for Quotations (RFQs) on an as-and-when-required basis.
• Evaluation in Stage 2 consists of: Step 1: Price and Preference Points/Specific Goals; Step 2: Objective Criteria Assessment (Designated Sectors, Subcontracting, NIPP); Step 3: SDL&I Objectives; Step 4: Order Placement.
• Prices are evaluated inclusive of VAT, corrected for arithmetical errors, excluding contingencies, adjusted for variations, and compared on a Net Present Value basis.
• Unconditional discounts are considered in evaluation; conditional discounts are applied at payment.
• Ranking of tenderers occurs only in Stage 2.

Objective Criteria:

• Class 1 Power Transformers is a designated sector with a mandatory 80% local content requirement. If this cannot be met, tenderers must obtain a DTIC exemption letter and submit it as a mandatory returnable at tender closing.
• Subcontracting: up to 30% subcontracting will be considered for contracts R30 million and above, with beneficiaries being EMEs or QSEs that are at least 51% black-owned. Possible scope for subcontracting includes shipping, transportation, delivery, installation, and erection. Proof of subcontract agreements, CSD reports, and B-BBEE certificates must be submitted before contract award.
• NIPP applies to contracts with imported content equal to or exceeding USD 5 million.

SDL&I objectives (not part of scoring but contractual obligations): transformation (B-BBEE improvement or retention plan), local procurement content, procurement spend on entities with minimum 51% black ownership, jobs, and skills development.

Scope: Design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing, and commissioning of Class 1 power transformers on an as-and-when required basis over a five-year period for the Distribution Division.

Technical documents: Standard 240-68973110 Rev 3 and Technical Evaluation Criteria 240-171000616 Rev 1 are loaded on the Eskom Tender Bulletin Technical Folder.

Technical schedules A and B must be completely filled and submitted at tender closing.

Factory assessment will be conducted on all suppliers passing the technical evaluation threshold. If the tenderer is not the OEM, the factory evaluation will take place at the nominated factory where the equipment will be manufactured, to ensure capability and capacity to manufacture Class 1 power transformers.

Prices are not applicable for Stage 1 of the pre-qualification process. Pricing will only be evaluated during Stage 2, where pre-qualified suppliers participate in a closed competitive RFQ process.

Eskom standard payment terms: for contracts below R50 million (including VAT), payment within 30 days of receipt of undisputed invoices; for contracts above R50 million (including VAT), payment within 60 days.

Eskom reserves the right to negotiate with preferred bidders if tendered prices are not market-related.

Security for performance required at Stage 2: parent company guarantee OR performance bond (names of two financial institutions to be submitted with the tender), and retention bond valid for the defects period. Financial institutions must be selected from Eskom-approved list.

Eligibility: Tenderers must not be under any restriction to do business with Eskom or State-Owned Companies, must not be on the National Treasury Tender Defaulters list or Eskom's restricted suppliers list, and must not have a conflict of interest. Tenderers must not be of a nationality on any international sanctions list. Tenderers must not submit more than one tender (except as a JV partner) and must not subcontract 100% of the scope. JV/consortium agreements must state joint and several liability.

CSD registration: Not mandatory at tender closing, but mandatory prior to contract award. Tenderers may register at www.treasury.gov.za.

Tax compliance: Tenderers must provide a SARS e-filing PIN for verification, or if not registered on CSD (foreign suppliers), provide a current valid tax compliance certificate by contract award. Foreign suppliers with no South African footprint must complete SBD 1 but no proof of tax compliance is required.

B-BBEE: Proof of B-BBEE status level of contributor is required (certificate, sworn affidavit, or other prescribed requirement).

Local content: Mandatory 80% local content for Class 1 Power Transformers, calculated per SATS 1286:2011. Tenderers must submit SBD 6.2 and Annexures G2, G3, G4. If unable to meet the 80% requirement, a DTIC exemption letter must be submitted as a mandatory returnable.

Employment Equity: Designated employers must provide proof of compliance with the Employment Equity Act, including proof of submission of the EE report to the Department of Labour (South African tenderers only).

CIDB: Not applicable.

Contract skills development goals and contract participation goals: Not applicable.

The document is a technical schedule for a 5MVA, 66/3.3kV YNd1 power transformer, covering purchaser-specific requirements (Schedule A) and guaranteed technical particulars (Schedule B). It includes sections for purchasing details, delivery and off-loading, erection, tests, ratings, voltages, tapping, transformer type, operating environment, losses, impedance, temperature rises, acoustic noise, insulation, bushings, physical arrangement, cooling equipment, tap-changers, drawings and manuals, and indicating/protective devices.

Bidders must complete Technical Schedules A and B for the 5MVA transformer, providing guaranteed technical particulars. The deviation schedule must list any deviations with reasons and evidence that each deviation is more cost-effective than the specified requirement. The design parameter schedule and general information schedule must be completed, covering core steel, winding design, insulation, oil quantities, masses, and zero sequence impedances. A detailed list of recommended spares must be provided. No standard eligibility criteria (CSD, tax clearance, B-BBEE) are stated in the document.

The transformer is a 5MVA, 66/3.3kV, YNd1, core-type, ONAN-cooled unit, class 1, heavy duty, with a 3-limb core. Continuous rated power is 5 MVA (ONAN); ONAF is not applicable. Primary voltage is 66 kV r.m.s, secondary 3.3 kV r.m.s. Tapping range is +5% to -15% of principal ratio in 1.25% steps, with 17 positions including transitions. Resulting no-load voltages: 66 kV on principal tapping, 69.3 kV on extreme plus, 56.1 kV on extreme minus. Vector group YNd1. Cooling is ONAN. Operating environment: very heavy pollution, corrosion protection per Eskom specification 240-56030674. Maximum acoustic noise 71 dB(A). Temperature rises at 1800 m altitude: top oil 55 K, windings 60 K, hotspot of winding <73 K, hotspot of metal parts in contact with oil <80 K. Primary/secondary impedance at 75°C on principal tapping is 9%, on extreme plus unspecified, on extreme minus >7%; tolerances per IEC, with extreme minus tolerance +10%/-0. Minimum insulation: impulse withstand for primary 350 kV peak, secondary 40 kV peak; 60-second separate source primary 95 kV r.m.s, secondary 10 kV r.m.s; induced-overvoltage primary to earth 140 kV r.m.s, secondary 6.6 kV r.m.s. Main terminals and bushings are outdoor type. Primary bushing: stem 38 x 125 mm, current rating 1250 A (incl 20% overcurrent), impulse withstand 450 kV peak at 1800 m, power frequency withstand 155 kV r.m.s, total creepage 2247.5 mm. Secondary bushing: stem 26 x 125 mm, current rating 1050.97 A, impulse withstand 200 kV peak, power frequency withstand 70 kV r.m.s, total creepage 1116 mm. Neutral terminal: stem 38 x 125 mm, current rating 1250 A, impulse withstand 450 kV peak, power frequency withstand 155 kV r.m.s, total creepage 2247.5 mm. Overall dimensions: height 5500 mm, length 6400 mm, width 5000 mm. Safe withstand vacuum at sea level 1.5 kPa. Transformer oil type per Eskom specification 240-75661431. Tap-changer is OLTC, located at Y-neutral end, with 300000 maintenance-free operations; nominal 50 Hz ratings: voltage 44 kV, current 61.82 A (both non-vacuum and vacuum types); insulation level phase-to-phase 250 kV peak; 50 Hz withstand phase-to-phase 95 kV r.m.s. Drawings: 1 set as per clause 3.22; manuals: 5 hard copies plus 1 electronic. Indicating and protective devices: pressure relief device per 240-56063871, oil- and gas-actuated relay per 240-56063908, no conservator bag required, dehydrating breathers per 240-56062529, oil level indicators per 240-56356191, oil and winding temperature thermometers digital plus analogue. Type test and routine test certificates must be submitted. Losses: no plus tolerance allowed; no-load losses at 90%, 100% (used in financial evaluation), and 110% of rated power; load losses at extreme plus, nominal, and extreme minus tap positions (loss evaluation uses the average of the three). Losses for cooling fans (power and current) to be provided. Maximum current density in windings to be provided. Delivery: transformer delivered to Works Info, off-loaded and transferred to operating position by supplier, with 500 mm rise or fall to off-loading position, impact recorders on tank. Erection: erected ready for service, with 4 layers x 4 mm (total 16 mm) of Malthoid. Tests: temperature rise (type), lightning impulse (routine), chopped impulse (special), acoustic noise (type), capacitances (routine), short duration AC with partial discharge (routine), zero sequence impedance (routine), and low voltage tests including frequency response analysis, ratio, magnetisation, impedance on extreme plus/nominal/extreme minus taps, winding DC resistance on all taps, bushing tan delta and capacitance, overall winding insulation, insulation resistance to earth, and CT magnetisation and ratio (all routine).

No specific requirements found

Supply of 5 MVA, 44/6.6 kV YNd1 Class 1 power transformers on an as-and-when required basis over five years for Eskom Distribution. Scope includes design, manufacture, testing, delivery, installation, erection, site-testing and commissioning.

Bidders must offer a Class 1 power transformer meeting the technical schedules. The no-load loss at 100% rated power will be used in financial evaluation. Loss evaluation uses the average of load losses at extreme plus, nominal, and extreme minus tap positions. Bidders must complete and sign the Technical Schedule, Deviation Schedule (if any), Design Parameter Schedule, and General Information Schedule. Evidence of compliance with referenced Eskom specifications is required. No additional eligibility criteria such as CSD, B-BBEE, or CIDB grading are stated.

Transformer rating: 5 MVA, 44/6.6 kV, vector group YNd1, core type, 3 limbs, ONAN cooling, heavy duty type.

Voltage tapping range: +5% to -15% in 1.25% steps, 17 positions including transitions.

Impedance on principal tapping: 10%; extreme minus tapping minimum >9%; tolerances per IEC, extreme minus +10/-0.

Temperature rises at 1800 m altitude: top oil 55 K, windings 60 K, hotspot <73 K, metal parts <80 K.

Insulation levels: primary impulse 250 kV peak, secondary 75 kV peak; power frequency primary 70 kV, secondary 20 kV; induced overvoltage primary 95 kV, secondary 22 kV.

Bushings: outdoor type, primary and neutral 1000 A, secondary 525.5 A; creepage distances 1612 mm primary/neutral, 1116 mm secondary.

Overall dimensions: height 5500 mm, length 6400 mm, width 5000 mm.

Tap-changer: OLTC, 300,000 maintenance-free operations, 33 kV, 92.7 A, located at Y-neutral end.

Oil type per Eskom spec 240-75661431; corrosion protection per 240-56030674; pollution level very heavy.

Safe withstand vacuum at sea level: 1.5 kPa.

Drawings: 1 set; manuals: 5 hard copy + 1 electronic.

Indicating devices: digital+analogue oil and winding temperature thermometers; pressure relief, oil/gas relay, dehydrating breathers, oil level indicators per referenced Eskom specs; no conservator bag required.

Type tests required for first-of-design units; routine tests include lightning impulse, capacitances, short duration AC with partial discharge, zero sequence impedance, low voltage tests (FRA, ratio, magnetisation, impedance, DC resistance, bushing tan delta, overall insulation, insulation resistance, CT tests).

Bidders must provide detailed test plan for evaluation and schedule of type and routine test certificates.

Deviations must be listed with reasons and evidence of cost-effectiveness.

The document is a technical schedule for a 2.5 MVA, 22/3.3 kV Dyn11 power transformer, covering purchaser-specific requirements and bidder-offered guarantees and technical particulars.

Returnable documents: the Technical Schedules A and B, Design Parameter Schedule, General Information Schedule, and Deviation Schedule must be completed and signed by the supplier and factory. Any deviations from the specification must be listed in the Deviation Schedule with reasons and evidence that the deviation is more cost-effective than the specified requirement. A detailed test plan must be provided for evaluation. The document does not specify a submission channel or disqualification rules beyond completing the schedules.

No formal scoring split or preference point system is stated. The no-load loss at 100% rated power will be used in financial evaluation. Loss evaluation will use the average of load losses at extreme plus, nominal, and extreme minus tap positions. No plus tolerance is allowed on transformer losses. Bidders must complete and sign the Technical Schedules, Design Schedule, Deviation Schedule, and General Information Schedule.

The transformer is a 2.5 MVA, 22/3.3 kV, Dyn11, class 1 power transformer, core type, 3 limbs, ONAN cooling, heavy duty, for outdoor installation at an altitude of 1 800 m in a very heavy pollution environment.

• Delivery: supplier off-loads from transport vehicle and transfers to operating position; rise or fall to off-loading position 500 mm; acceleration limit unspecified; impact recorder on tank.
• Erection: erected ready for service; 4 layers x 4 mm (total 16 mm) of Malthoid under base.
• Ratings: continuous ONAN rating 2.5 MVA; ONAF not applicable. Primary 22 kV r.m.s, secondary 3.3 kV r.m.s. Tapping range +5% to -5% of principal ratio in 2.5% steps, 5 positions. No-load voltage on principal tapping 22 kV, extreme plus 23.1 kV, extreme minus 20.9 kV.
• Impedance at 75 °C on principal tapping 6%; extreme minus tapping minimum >5%; tolerances per IEC on principal and extreme plus, extreme minus +10% / -0%.
• Temperature rises at 1 800 m: top oil 55 °K, windings by resistance 60 °K, hotspot of winding < 73 °K, hotspot of metal parts in contact with oil < 80 °K.
• Insulation: impulse withstand primary 150 kV peak, secondary 40 kV peak; 60-second separate source primary 50 kV r.m.s, secondary 10 kV r.m.s; induced overvoltage primary to earth 44 kV r.m.s, secondary 6.6 kV r.m.s.
• Bushings: outdoor type; primary and secondary stem 26 x 125 mm; primary current rating >80 A, secondary >263 A (incl 20% overcurrent); impulse withstand 200 kV peak at 1 800 m; power frequency withstand 70 kV r.m.s; total creepage 1 116 mm.
• Physical: overall height 5 500 mm, length 6 400 mm, width 5 000 mm; transport dimensions and weight to be offered; tank base plate type and thickness to be offered.
• Tap-changer: off-circuit tap switch (OCTS), tappings at Y-neutral end; nominal 50 Hz voltage 22 kV, current >80 A (non-vacuum and vacuum); insulation phase-to-phase 150 kV peak impulse, 50 kV r.m.s 50 Hz withstand.
• Accessories: pressure relief device, oil- and gas-actuated relay, dehydrating breathers, oil level indicators, oil and winding temperature thermometers (digital and analogue) per specified Eskom specifications; conservator bag not required.
• Drawings and manuals: 1 set of drawings as per clause 3.22; 5 hard copy plus 1 electronic manual.
• Tests: routine tests include lightning impulse, capacitances, short duration AC with partial discharge, zero sequence impedance (three winding), frequency response (factory and site), ratio, magnetisation, impedance on all tap positions, winding DC resistance, bushing tan delta, overall winding insulation, insulation resistance, CT magnetisation and ratio. Type tests: temperature rise, acoustic noise. Special test: chopped impulse. Type tests are for first-of-design units only, but Eskom may request them for any transformer.
• Losses: no-load losses at 90%, 100% and 110% of rated power to be offered; load losses at extreme plus, nominal, and extreme minus tap positions to be offered; no plus tolerance allowed.
• Corrosion protection per Eskom specification 240-56030674; oil type per 240-75661431; safe withstand vacuum 1.5 kPa at sea level.
• Maximum acoustic noise as per IEC.
• Maximum current density in primary and secondary windings to be offered.
• Core steel manufacturer, grade, thickness, core dimensions, cross-sectional areas, total core mass, design flux density, volts/turn, winding design details (type, turns, diameters, radial build, heights, conductor size, insulation, current density, masses) to be offered in the Design Parameter Schedule.
• Oil quantities, masses (core steel, insulation, active part, tank, coolers, oil, greatest transportation mass), zero sequence impedances, filling medium for transport, and training of purchaser's staff to be offered in the General Information Schedule.
• Spares recommended by manufacturer to be provided as a detailed list.

No specific compliance requirements such as CSD registration, tax status, B-BBEE, or CIDB grading are stated in the document.

The works includes design, detailed engineering, design review, manufacturing, testing at the contractor's works, shipping, local transport, offloading, installation and assembly, oil filling, testing, commissioning and supply of fully functional power transformers as stipulated in the purchase order. The works is done strictly in accordance with the Employer's Specification 240-68973110, all accompanying commercial annexures and documents, and agreed test and inspection plan. The works includes the entire power transformer auxiliary equipment normally supplied with a new transformer including but not limited to conservator tank, breathers, HV and MV Bushings, Radiators and Fans, Tap Changer, Protection equipment, Instrumentation, Valves, controls and marshalling kiosks. The works operates effectively for at least 40 years (expected design life).

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Bidders must be registered on the Central Supplier Database (CSD) and be tax compliant. Bidders must have a quality management system complying with ISO 9001 and ISO 14001, accepted by Eskom. Bidders must be able to provide a warranty that is conditional on installation supervision by an approved engineer/technician. Bidders must comply with Eskom Specification 240-68973110 and all normative references. Bidders must complete and sign Schedules A and B for each transformer, which take precedence over other specifications. Bidders must complete standard National Treasury forms including SBD 4 (Declaration of Interest), SBD 6.1 (Preference Points Claim), SBD 8 (Declaration of Bidder's Past Supply Chain Management Practices), and SBD 9 (Certificate of Independent Bid Determination).

Scope of works: design, detailed engineering, design review, manufacturing, testing at the contractor's works, shipping, local transport, offloading, installation and assembly, oil filling, testing, commissioning and supply of fully functional power transformers as stipulated in the purchase order.

Works must be performed strictly in accordance with:

• Employer's Specification 240-68973110 (Specification for Power Transformers rated for 1.25 MVA and above with a highest voltage of 2.2kV and above, including normative references).
• All accompanying commercial annexures and documents.
• Agreed test and inspection plan.

Scope of supply includes but is not limited to: all windings, tank and supporting structures, core, bushings, tap changer (on-load and/or off-circuit), radiators, fans and cooling equipment, protection equipment (PRV, Buchholz relays), digital temperature indicators, mechanical WTI & OTI, bagged conservator tank, cabling to marshalling interface box, kiosks and panels, on-line dissolved gas monitors, corrosion protection painting, dehydrating breathers, insulating oil, and transformer fast depressurisation and fire prevention equipment.

All individual units of the same SAP Number must be interchangeable with each other, including major components such as fans, bushings, oil pumps.

Expected design life: at least 40 years.

Design responsibilities:

• Contractor performs design and detailed engineering with drawings as detailed in the specification and accompanying Schedules A&B for each unit.
• Design review with the Employer present before closure of design detail.
• Outline drawings, design details and supporting documents must be provided to the Employer's Project Manager within 6 weeks of order placement, prior to ordering any materials.

Manufacturing and testing:

• Employer reserves the right to perform product or equipment inspections at any time with prior notice.
• Employer's representatives may attend and witness factory acceptance testing; Project Manager must be notified 12 weeks before the intended test date.

Transport, delivery, off-loading and installation:

• Contractor responsible for transport from factory to Employer's applicable Strategic Store, and for commissioning and installation at the store.
• Delivery and off-loading per A&B Schedules as stated in Purchase Orders.
• On completion, transformer handed over with all relevant test results and signed certificates.
• Minimum of 2 impact recorders fitted before transport: one inside the tank on the active part, one outside on the tank wall. Recorders stopped or removed only once transformer is in final position, witnessed by Employer's representative and signed by both parties.
• Continuous record of horizontal, vertical and longitudinal shock and vibration from lifting at factory to final placement.
• All bushings transported with shock/impact indicators per bushing specification 240-56062799.
• Contractor must provide allowable G Force values in the B schedule with tolerances.
• Impact recorder results at loading, after loading onto vehicle, and after off-loading onto plinth must be included in the inspection and test plan.
• Sweep Frequency Response Analysis (SFRA) and insulation resistance tests done on all windings prior to loading, repeated once transformer is in position at the store, and if supplied from abroad, repeated on the ship before offloading at the harbour.
• SFRA performed on highest tap position (tap position = 1 for Eskom Distribution transformers).
• Results of SFRA, insulation resistance, and transport vibration and shock monitoring submitted to Employer's Project Manager to demonstrate no damage or winding movement.
• Dry-air pressure indication must be readable from ground level.
• Contractor must notify Project Manager at least 6 weeks in advance of proposed transport dates with relevant details.

Testing and commissioning:

• Contractor responsible for comprehensive installation including all auxiliary plant (bushings, tap changer, conservator tank, radiators, marshalling kiosk, Buchholz relay, etc.).
• All tests listed in 240-68973110 must be performed and results documented.
• Contractor must maintain a safe and clean working environment at Eskom Strategic Stores.

Tools, blanking plates and spares:

• Contractor provides special tools or keys required for maintenance or adjustments, excluding long-term tap changer maintenance tools.
• Blanking plates supplied with transformers, painted to same specification as tank, remain property of Employer.
• Recommended spares list supplied after final design, including item descriptions, reference numbers, quantities, prices, guaranteed supply period, and recommended routine maintenance. Local supply indicated where possible.

Documentation to be submitted:

• QA Manual: 2 copies, ex-works + 2 weeks.
• Operating & Maintenance Manual: 2 copies, before commissioning of the Works.
• Soft copy of above: 1 copy, ex-works + 2 weeks.

Training:

• Contractor provides training to Employer's personnel in operation and maintenance.
• Two Master Training Manuals and electronic media (e.g. video) accepted; each trainee receives individual copy.
• Up to 15 people trained, duration up to two days.
• Training for store people and site staff responsible for maintenance.
• Training completed before hand-over; proof of training submitted as part of handing over documents.
• Engineering staff training arranged on ad-hoc basis in line with design, manufacturing, testing, and life management of transformers; proposal brought to Employer for acceptance.

Warranty:

• Applicable only if transformer installed by or under supervision of an engineer/technician approved by the factory.
• Storage or moving after storage must be supervised by manufacturer's supervisor or approved engineer/technician.
• If site not ready, Employer responsible for unit until site ready, adhering to Contractor's storage procedure.
• In other circumstances, Contractor remains responsible for handling and storage.
• Normal wear and tear, inadequate maintenance, Force Majeure, and damage not Contractor's fault are not covered.

Schedules A & B:

• Schedule A: Employer's specific requirements.
• Schedule B: Guarantees and technical particulars of equipment offered; Contractor guarantees values entered.
• Schedule A&B takes precedence over all other specifications.

Site work:

• Employer performs: bonding of bushings to ground, earthing of tank, cabling from marshalling interface box, connection of tap changer heater, provision of unobstructed access.
• Contractor responsible for all cabling from transformer and components to marshalling interface box, and supply and installation of all components necessary for completion.

Programme:

• First programme submitted to Employer for acceptance within six weeks of Purchase Order date, in MS Projects format, containing all activities, durations, resource details, start and completion dates, and milestones.

Completion:

• Sectional completion phases: design freeze, installation, unit completion.
• Design freeze: design review completed, design in totality, single line, general arrangement and detail drawings, all new plant interfaces, commissioning procedures, QA plans, inspection and test plans, manufacturing PQPs.
• Installation: signed clearance and test certificates, one set of red lined as-built drawings, completed PQPs, training manuals available, personnel fully trained, operating and maintenance manuals delivered, no defects, oil samples taken before and after installation.
• Unit completion: no outstanding defects, all documentation delivered, all QC documentation signed off.

Work provided by completion date: design, supply, delivery, removal of debris, corrosion protection, installation and commissioning, operating and maintenance manuals, training, as-built drawings, all quality documentation signed off.

Labour:

• All staff (permanent, non-permanent, part-time, sub-contracted, labour only) are Contractor's responsibility for supervision and control.

Restrictions:

• Contractor may interface with Employer's Protection and Metering department (PT&M), maintenance departments, and others.

Site materials:

• All removed plant and material remains property of Employer; Contractor stores at dedicated area.

Invoices:

• Must include: registered company name, VAT registration number, Employer's Contract & Purchase Order number, invoice sequence number, Employer's VAT registration number, and Contractor statement reflecting all payments and status.

Drawings:

• Applicable drawings in Annexures; additional drawings can be applied for.
• All new drawings become property of Employer.
• All drawings must adhere to 240-68973110.

Specifications and special requirements:

• Standards listed in annexure and referenced documents apply; revision as at date of Contract placement; Contractor responsible for obtaining latest revisions.
• Transportation limitations reflected in drawings and Annexure B.
• Notification time: 6 weeks prior to F.A.T's for local factories; 12 weeks for factories outside South Africa.
• Factory performance figures provided every 6 months; annual figures audited by independent body; deviations from quoted failure rates or on-time delivery rate must be reported.

The Contractor performs the design and detailed engineering with drawings of the works and affected power transformer auxiliary equipment as detailed in the specification and accompanying schedules A&B for each unit. The scope of supply includes all windings, tank and supporting structures, core, bushings, tap changer, radiators, fans and cooling equipment, protection equipment, digital temperature indicators, bagged conservator tank, cabling to marshalling interface box, kiosks, panels, on-line dissolved gas monitors, corrosion protection painting, dehydrating breathers, insulating oil, and transformer fast depressurisation and fire prevention equipment. All individual units of the same SAP Number must be interchangeable with each other, including major components. The Contractor shall perform a design review with the Employer present before closure of the design detail, and must provide outline drawings, design details and supporting documents to the Employer's Project Manager within 6 weeks of order placement, prior to ordering of any materials.

The Contractor is responsible for transport of the transformer from the factory to the Employer's applicable Strategic Store, and for commissioning and installation at the store. Transformers are to be delivered and off-loaded in accordance with A&B Schedules. On completion, the transformer must be handed over with all relevant test results and signed certificates. A minimum of 2 impact recorders are to be fitted to the transformer before transport, one inside the tank on the active part and one on the outside wall. The recorders are stopped or removed only once the transformer is in its final position, witnessed by the Employer's representative. One continuous record of shock and vibration is recorded from lifting at the factory to final placement. All bushings must be transported with shock/impact indicators per bushing specification 240-56062799. The Contractor must provide information on allowable G Force for the units in the B schedule. Results of impact recorders at loading, after loading onto vehicle, and after off-loading onto plinth must be included in the inspection and test plan. Sweep Frequency Response Analysis (SFRA) and insulation resistance tests are done on all windings prior to loading, and repeated once the transformer is in position at the store, and if supplied from abroad, repeated on the ship before offloading. The Contractor must submit results of SFRA, insulation resistance, and transport vibration and shock monitoring to the Employer's Project Manager. Dry-air pressure indication must be readable from ground level. The Contractor must notify the Project Manager at least 6 weeks in advance of proposed transport dates with relevant details.

The Contractor is responsible for comprehensive installation of the transformer, including all auxiliary plant necessary for proper operation such as bushings, tap changer, conservator tank, radiators, marshalling kiosk, buchholz relay, etc. The Contractor must perform all necessary testing and inspections to ensure safe commissioning, and ensure all tests listed in 240-68973110 are performed and results documented. The Contractor must maintain a safe and clean working environment for the duration of the Contract at Eskom Strategic Stores.

The Contractor provides any special tools or keys required for maintenance or affecting adjustments, excluding special tools for long-term tap changer maintenance. The Contractor supplies transformers with all blanking plates, which remain the property of the Employer, painted to the same specification as the transformer tank. The Contractor supplies a list of recommended spares for the works after final design, including item descriptions, reference numbers, quantity recommended, prices, and guaranteed supply period, and details recommended routine maintenance. Where possible, local supply of plant and material must be indicated.

The Contractor supplies the following minimum documentation: QA Manual (2 copies, ex-works + 2 weeks), Operating & Maintenance Manual (2 copies, before commissioning of the Works), and soft copy of the above (1 copy, ex-works + 2 weeks).

The Contractor shall provide training to the Employer at different levels. For site staff, the Contractor provides training in operation and maintenance of the works, with a list of recommended training activities including duration and location. The Contractor provides two Master Training Manuals and an electronic media like video is accepted. Each person trained receives an individual copy of the training manual. The Project Manager will provide the number of Employer's personnel to be trained up to a maximum of 15 people and duration up to two days. Training is given to store people for units being delivered and erected for storage, and site staff responsible for maintenance for units being installed and commissioned. Training must be completed before hand-over of the works, and proof of training submitted as part of handing over documents. For engineering staff, training shall be arranged on ad-hoc basis in line with design, manufacturing, testing, and life management of transformers. The Contractor shall bring a proposal to the Employer for acceptance, and during each contract review, the OEM shall produce records of training done.

The Employer performs the following specific tasks at the strategic store: bonding of transformer bushings to ground, earthing of the transformer tank, cabling from marshalling interface box, connection of the tap changer heater to the relevant supply, and provision of unobstructed access to site. The Contractor is responsible for all cabling from the transformer and its components to the marshalling interface box as well as the supply and installation of all components necessary for completion of the works. The Employer will provide all relevant information pertaining to the site.

The Contractor submits a first program to the Employer for acceptance within six weeks of the Purchase Order date. The program contains all activities, durations, resource details, start date, completion date and relevant milestone dates, submitted in MS Projects format.

Sectional completion for the transformer includes the following phases: Design freeze (design review completed, design in totality according to Works Information, single line, general arrangement and detail drawings, all new plant interfaces, commissioning/re-commissioning procedures, quality assurance plans, inspection and test plans, manufacturing PQPs); Installation (signed clearance and test certificates, one set of red lined as-built drawings, completed PQPs, training manuals available, personnel fully trained, operating and maintenance manuals delivered, no defects and installation according to Works Information, oil samples taken before and after installation); Unit completion (no outstanding defects, all documentation as required in Section 2.3.4 delivered, all quality control documentation signed off with no outstanding issues).

The following works are provided by the Contractor by the completion date: design, supply whole of the works, deliver whole of the works, removal of all debris, tools and equipment used during erection, corrosion protection on whole of the works, installation and commissioning of the works, operating and maintenance manuals, employer staff training and training manuals, as-built drawings for whole of the works, and all quality documentation signed off with no outstanding actions.

Special requirements include: transportation requirements and limitations as reflected in the drawings and additional information provided in Annexure B; notification time for local factories of 6 weeks prior to F.A.T's and for factories outside South Africa of 12 weeks prior to F.A.T's; and factory performance figures to be provided every 6 months, with annual performance figures audited by an independent body, and the Contractor must inform the Employer of any deviations from quoted factory failure rates or on-time delivery rate.

Power transformers are to be manufactured in accordance with a quality assurance management system complying with the latest ISO 9001 and ISO 14001 standards, and must be accepted by the Employer. The Employer reserves the right to conduct surveillance and periodic inspections at the Contractor's works during the manufacturing phase. The Contractor submits Process Quality Plans (PQPs) to the Employer for acceptance 6 weeks after the Purchase Order date, including all witness and hold points. Draft copies are submitted and discussed during the design review phase.

PQPs must cover: manufacturing (including design stages and all processes up to and including testing), transport ex-works from factory to final position at the applicable store, and assembly and commissioning at site. PQPs must include details of the process, acceptance by the Employer, a list of signatures (with reference to the owner) for completing all steps, hold points and witness points, references to certificates or important documentation, and breakdown of the main process into individual tasks or steps with signature and date for each.

Factory testing scope is detailed in the A&B schedules and standard 240-68973110, with acceptance criteria per the latest IEC standard as at the date of the order. The Employer reserves the right to be present during any or all tests. The Contractor must inform the Employer of the testing date 12 weeks in advance. The Employer's Project Manager releases a power transformer for despatch only when all tests have been successfully completed and all necessary quality documentation completed. The Employer's Project Manager must give the instruction for despatch within 48 hours from successful test.

Design review meetings are scheduled to ensure common understanding of specific requirements and applicable standards, structured as detailed in 240-68973110, scheduled by the Contractor at least 12 weeks before the meeting (6 weeks for local factories). The design review meeting will be held at the manufacturer's works or as otherwise specified. The Contractor minutes all important information during the design review process and ensures all outstanding actions are addressed and agreed upon by all parties before manufacturing starts.

The Contractor demonstrates compliance to the applicable Quality documents as referenced in the specifications. The Contractor authorises all documents submitted as demonstration of compliance to the quality requirements of the contract. Before plant is placed in service, the Contractor is to certify that it is in safe condition.

Warranty is only applicable if the transformer has been installed by, or under the supervision of, an engineer/technician approved by the respective factory. Preparation for storage or moving after storage must be supervised by the manufacturer's supervisor or an approved engineer/technician. If the site is not ready for installation and commissioning, the Employer is responsible for the unit until the site is ready, and must adhere to the Contractor's storage procedure. In all other circumstances, the Contractor remains responsible for handling and storage of items. Equipment must be handled and maintained in compliance with manufacturer's instructions and not exposed to conditions other than those defined by the Contract. Normal wear and tear, inadequate maintenance, Force Majeure, and any damage not considered the Contractor's fault are not covered by warranty.

Schedule A specifies the Employer's requirements. Schedule B specifies guarantees and technical particulars of equipment offered by the Contractor, who guarantees the values entered in Schedule B. Schedule A&B takes precedence over all other specifications.

All staff, whether permanent, non-permanent, part-time, sub-contracted, or labour only supply, are the Contractor's responsibility in terms of supervision and control.

The Contractor may interface with the Employer's Protection and Metering department (PT&M), the Employer's maintenance departments, and any other.

All plant and material that are removed remain the property of the Employer. The Contractor stores the removed plant and material at a dedicated area.

Invoices must include: registered name of the company, VAT registration number, Employer's Contract & Purchase Order number, invoice sequence number, Employer's VAT registration number, and a Contractor statement reflecting all payments and status.

Applicable drawings for this contract are contained in the Annexures. Additional drawings required to supply the works can be applied for by the Contractor. All new drawings become the property of the Employer. All drawings provided by the Contractor must adhere to 240-68973110.

The following standards and those listed in the annexure contain provisions that, through reference in text, constitute requirements of this document, including reference documents referred to in these standards. The revision as at the date of Contract placement is applicable. The Contractor is responsible for obtaining the latest revision of these documents.

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an as-and-when required basis over a five-year period for Eskom's distribution division. The technical schedules specify a 5 MVA, 22/2.2 kV YNyn0 power transformer as a representative unit.

Returnable documents — the bid pack comprises the Technical Schedule, Deviation Schedule, Design Parameter Schedule and General Information Schedule, all of which must be completed and signed. Bidders must also submit a detailed test plan for evaluation, a schedule of type test and routine test certificates, and a list of recommended spares. Any deviations from the specification must be listed in the Deviation Schedule with reasons and evidence that the deviation is more cost-effective than the specified design. The tender document must be signed by the supplier, factory and Eskom representatives as required.

Bidders must complete all schedules (Technical, Deviation, Design Parameter, General Information) and provide a detailed test plan. Loss evaluation will be performed using the average of load losses at extreme plus, nominal and extreme minus tap positions; no plus tolerance is allowed on transformer losses. The no-load loss at 100% rated power will be used in the financial evaluation. Type tests are required for first-of-design units only, although Eskom may request them for any transformer. Deviations must be justified as more cost-effective.

The tender covers the design, manufacture, testing, supply, delivery, installation and commissioning of Class 1 power transformers on an as-and-when basis over five years. This technical schedule specifies a 5 MVA, 22/2.2 kV YNyn0 power transformer with the following key parameters:

• Continuous rated power: 5 MVA (ONAN); ONAF not applicable.
• Rated voltages: primary 22 kV r.m.s, secondary 2.2 kV r.m.s.
• Tapping range: +5% to -15% of principal tapping ratio, in 1.25% steps, 17 positions.
• No-load voltage on principal tapping 22 kV, extreme plus 23.1 kV, extreme minus 18.7 kV.
• Vector group YNyn0, core type, 3 limbs, ONAN cooling.
• Impedance at 75°C on principal tapping 6%, extreme minus >5%; tolerances per IEC, extreme minus +10/-0%.
• Temperature rises at 1800 m altitude: top oil 55 K, windings 60 K, hotspot <73 K, metal parts <80 K.
• Insulation levels: impulse withstand primary 150 kV peak, secondary 40 kV peak; 60-second separate source primary 50 kV r.m.s, secondary 10 kV r.m.s; induced overvoltage primary 44 kV r.m.s, secondary 4.4 kV r.m.s.
• Bushings: outdoor type, primary stem 26 x 125 mm, current rating >159 A, impulse withstand 200 kV peak, power frequency 70 kV r.m.s, total creepage 1116 mm; secondary stem 26 x 125 mm, current rating >526 A, same withstand and creepage.
• Overall dimensions: height 5500 mm, length 6400 mm, width 5000 mm.
• Tap-changer: OLTC, Y-neutral end, 300,000 maintenance-free operations, rated 22 kV, current >185 A (both non-vacuum and vacuum), insulation phase-to-phase 150 kV peak, 50 Hz withstand 50 kV r.m.s.
• Safe withstand vacuum at sea level 1.5 kPa.
• Corrosion protection per Eskom spec 240-56030674; pollution level very heavy.
• Heavy duty type: YES.
• Oil type per Eskom spec 240-75661431.
• Indicating/protective devices: pressure relief device per 240-56063871, oil- and gas-actuated relay per 240-56063908, dehydrating breathers per 240-56062529, oil level indicators per 240-56356191, oil and winding temperature thermometers digital+analogue.
• Conservator bag not required.
• Drawings: 1 set per clause 3.22; manuals 5 hard copy + 1 electronic.
• Training on components to be provided to purchaser's staff.
• Delivery: transformer delivered to works info, off-loaded and transferred to operating position by supplier; off-loading rise/fall 500 mm; impact recorders on tank.
• Erection: erected ready for service, with 4 layers x 4 mm Malthoid (total 16 mm).
• Tests: routine tests include lightning impulse, capacitances, short duration AC with partial discharge, zero sequence impedance, low voltage tests (frequency response analysis at factory and site, ratio, magnetisation, impedance on all tap positions, winding DC resistance, bushing tan delta, overall insulation, insulation resistance, CT magnetisation and ratio); type tests include temperature rise and acoustic noise; special test chopped impulse.
• Design schedule requires bidders to provide core steel details, core dimensions, cross-sectional areas, core mass, flux densities, volts/turn, winding design details (type, turns, diameters, radial build, heights, conductor size, insulation, current density, masses), inter-winding insulation barriers, and zero sequence impedances.
• General information schedule requires oil quantities, masses (core steel, insulation, active part, tank, coolers, oil, greatest transport mass), zero sequence impedances, filling medium for transport, and training details.

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an "as and when" required basis over a five (5) year period for distribution division. This specific document covers the technical schedules for an 80 MVA, 132/44 kV YNd1 power transformer.

Returnable documents — the technical schedules (A and B) must be completed with guaranteed values and technical particulars, and the deviation schedule must list any deviations with justification and evidence of cost-effectiveness. Standard SBD forms must be completed and signed: SBD 4 (Declaration of Interest), SBD 6.1 (Preference Points Claim), SBD 6.2 (Declaration for Local Production and Content), SBD 8 (Declaration of Bidder's Past Supply Chain Management Practices), and SBD 9 (Certificate of Independent Bid Determination). Bidders must also provide a detailed test plan for evaluation and a list of recommended spares.

The tender is evaluated on the technical schedules (A and B) with guaranteed values and technical particulars. Loss evaluation will be performed using the average of the no-load loss values at 90%, 100%, and 110% of rated power, and the load loss values at extreme plus, nominal, and extreme minus tap positions. The no-load loss at 100% will be used in the financial evaluation. No plus tolerance is allowed on transformer losses. Bidders must provide a detailed test plan for evaluation.

The transformer is a Class 1, 80 MVA, 132/44 kV, YNd1 power transformer with ONAN/ONAF cooling. It must be delivered to the works info location, off-loaded and transferred to the operating position by the supplier. The off-loading position has a rise or fall of 500 mm. The transformer must be erected ready for service on a 4 layers x 4 mm layer (total 16 mm) of Malthoid. Tests required: temperature rise tests (type), lightning impulse test (routine), chopped impulse test (routine), acoustic noise level measurements (type), determination of capacitances (routine), short duration AC tests with partial discharge measurements (routine), zero sequence impedance measurement for three winding transformers (routine), and low voltage tests including frequency response analysis (factory and site), ratio, magnetisation, impedance on extreme plus, nominal and extreme minus tap positions, winding DC resistance on all taps, bushings tan delta and capacitance, overall winding insulation, insulation resistance to earth, and current transformer magnetisation and ratio test (all routine). Continuous rated power: 56 MVA ONAN (70% of ONAF) and 80 MVA ONAF. Rated voltage: 132 kV primary, 44 kV secondary. Voltage tapping range: +5% to -15% of the ratio on the principal tapping, in steps of 1.25%, with 17 positions including transition positions. Resulting no-load voltage: 132 kV on principal tapping, 138.6 kV on extreme plus, 112.2 kV on extreme minus. Vector group YNd1, core type, 3 limbs, winding arrangement Core/LV/HV/RW. Operating environment: corrosion protection per Eskom specification 240-56030674, pollution level very heavy. Maximum current density in windings: primary (outer) and secondary (inner) to be provided. Transformer losses: no load losses at 90%, 100%, and 110% of rated power, and load losses at extreme plus, nominal, and extreme minus tap positions, all to be provided. Losses for cooling equipment (fans): power and current to be provided. Primary/secondary impedance at 75 °C at rated MVA: 11% on principal tapping, maximum on extreme plus tapping, >10% on extreme minus tapping. Tolerances per IEC on principal and extreme plus tapping, +10/-0 on extreme minus tapping. Temperature rises at altitude of 1800 m: top oil 55 °K, windings (by resistance) 60 °K, hotspot of winding <73 °K, hotspot of metal parts in contact with oil <80 °K. Maximum acoustic noise 80 dB(A). Heavy duty type: yes. Minimum insulation for windings: impulse withstand test voltage for line terminal 550 kV peak primary, 250 kV peak secondary; sixty-second separate source 38+ kV r.m.s primary, 70x kV r.m.s secondary; sixty-second induced-overvoltage withstand test voltages 230 kV r.m.s primary to earth, 95 kV r.m.s secondary. Main terminals and bushings: outdoor oil/air type. Primary bushing details: stem size 38 x 125 mm, impulse withstand voltage at 1800m 650 kV peak, power frequency withstand voltage 275 kV r.m.s, total creepage >4495 mm. Secondary bushing details: stem size 38 x 125 mm, impulse withstand voltage at 1800m 250 kV peak, power frequency withstand voltage 95 kV r.m.s, total creepage >1612 mm. Neutral bushing details: stem size 38 x 125 mm, impulse withstand voltage at 1800m 650 kV peak, power frequency withstand voltage 275 kV r.m.s, total creepage >4495 mm. Physical arrangement: compliance with Figure 2 and 3, overall dimensions of complete unit: height 5500 mm, length 6400 mm, width 5000 mm. Transport dimensions and tank dimensions to be provided. Cooling equipment: radiators and motors details to be provided. Safe withstand vacuum at sea level 1.5 kPA. Transformer oil type per Eskom specification 240-75661431. Tap-changers: OLTC type, tap-changer manufacturer, model, precise electrical location of tappings at Y-neutral end, number of maintenance free operations 300000, nominal 50 Hz ratings: voltage 132 kV, current (non-vacuum type) 494 A, current (vacuum type) to be provided. Insulation levels of tap-changer: phase-to-phase 110+ kV peak, 50 Hz withstand phase-to-phase 230 kV r.m.s. Tap-changer contacts: selector, selector switch, diverter switch, tie-in resistor used (yes/no), value of tie-in resistor, transition resistor, driving motor type 3 phase, supply voltage 400 V a.c, power and current to be provided. Drawings and manuals: quantity of drawings as per 3.22 is 1, quantity of manuals (hard copy + electronic) is 5 + 1. Indicating and protective devices: tap-changer protective device (specify type), pressure relief device per Eskom specification 240-56063871, oil- and gas-actuated relay per Eskom specification 240-56063908, conservator bag required yes, conservator bag type to be provided, dehydrating breathers per Eskom specification 240-56062529, oil level indicators per specification 240-56356191, oil temperature thermometer digital+analogue, winding temperature thermometer(s) digital+analogue. Schedule of type test and routine test certificates submitted: yes. Spares recommended by manufacturer: provide detailed list.

Bidders must complete and submit the standard SBD forms: SBD 4 (Declaration of Interest), SBD 6.1 (Preference Points Claim), SBD 6.2 (Declaration for Local Production and Content), SBD 8 (Declaration of Bidder's Past Supply Chain Management Practices), and SBD 9 (Certificate of Independent Bid Determination).

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an "as and when" required basis over a five-year period for Eskom's distribution division. The specific transformer covered by this technical schedule is a 5 MVA, 88/11 kV, YNd1 power transformer.

Bidders must complete and sign the Technical Schedules, Deviation Schedule, Design Parameter Schedules, and General Information Schedule. They must provide type test and routine test certificates for the offered transformer design. Bidders must comply with Eskom specifications referenced in the tender (e.g., 240-56030674 for corrosion protection, 240-56063871 for pressure relief device, 240-56063908 for oil- and gas-actuated relay, 240-56062529 for dehydrating breathers, 240-56356191 for oil level indicators, 240-75661431 for transformer oil type). The tender document does not specify additional eligibility criteria such as CSD registration, B-BBEE requirements, or CIDB grading.

The transformer is a 5 MVA, 88/11 kV, YNd1, Class 1 power transformer, core type, with ONAN cooling, 3 limbs, and a vector group YNd1. It must be heavy duty, with a 5 MVA continuous rating on ONAN, and no ONAF rating. Primary voltage is 88 kV r.m.s, secondary 11 kV r.m.s. Voltage tapping range is +5% to -15% of the principal tapping ratio, in steps of 1.25%, with 17 positions including transition positions. Resulting no-load voltage on principal tapping is 88 kV, on extreme plus tapping 92.4 kV, on extreme minus tapping 74.8 kV. Primary/secondary impedance at 75°C on principal tapping is 10%, on extreme minus tapping >9%, with IEC tolerances and +10/-0 tolerance on extreme minus tapping. Temperature rises at 1800 m altitude: top oil 55 K, windings by resistance 60 K, hotspot of winding <73 K, hotspot of metal parts in contact with oil <80 K. Maximum acoustic noise as per IEC. Minimum insulation: impulse withstand for primary line terminal 450 kV peak, secondary 95 kV peak; 60-second separate source primary 95 kV r.m.s, secondary 28 kV r.m.s; 60-second induced-overvoltage primary to earth 185 kV r.m.s, secondary 22 kV r.m.s. Main terminals and bushings are outdoor type. Primary bushing: stem 38 x 125 mm, current rating 1250 A (incl 20% overcurrent), impulse withstand at 1800 m 550 kV peak, power frequency withstand 230 kV r.m.s, total creepage 3813 mm. Secondary bushing: stem 26 x 125 mm, current rating >630 A, impulse withstand 200 kV peak, power frequency withstand 70 kV r.m.s, total creepage 1116 mm. Neutral terminal: stem 38 x 125 mm, current rating 1250 A, impulse withstand 550 kV peak, power frequency withstand 230 kV r.m.s, total creepage 3813 mm. Overall dimensions: height 5500 mm, length 6400 mm, width 5000 mm. Safe withstand vacuum at sea level 1.5 kPa. Transformer oil type per Eskom specification 240-75661431. Tap-changer is OLTC, located at Y-neutral end, with 300,000 maintenance-free operations, nominal 50 Hz ratings: voltage 44 kV, current >93 A (both non-vacuum and vacuum types), insulation levels phase-to-phase 250 kV peak, 50 Hz withstand phase-to-phase 95 kV r.m.s. Drawings: 1 set as per clause 3.22; manuals: 5 hard copies + 1 electronic. Indicating and protective devices: tap-changer protective device to be specified, pressure relief device per Eskom spec 240-56063871, oil- and gas-actuated relay per 240-56063908, no conservator bag required, dehydrating breathers per 240-56062529, oil level indicators per 240-56356191, oil temperature thermometer digital+analogue, winding temperature thermometer digital+analogue. Type test and routine test certificates must be submitted. Bidders must provide a detailed list of recommended spares. Delivery: transformer delivered to Works Info, off-loaded and transferred to operating position by supplier, distance from off-loading position 0 m, rise or fall 500 mm, impact recorders on tank. Erection: erected ready for service, with 4 layers x 4 mm (total 16 mm) of Malthoid. Tests: temperature rise tests (type), lightning impulse (routine), chopped impulse (special), acoustic noise level measurements (type), determination of capacitances (routine), short duration AC tests with partial discharge measurements (routine), zero sequence impedance measurement for three winding transformers (routine), low voltage tests including frequency response analysis (factory and site), ratio, magnetisation, impedance on extreme plus, nominal and extreme minus tap positions, winding DC resistance on all taps, bushings tan delta and capacitance, overall winding insulation (tan delta and capacitance), insulation resistance to earth, current transformer magnetisation and ratio test (all routine). No plus tolerance allowed on transformer losses; no-load losses at 100% will be used in final evaluation; loss evaluation will use average of load losses at extreme plus, nominal, and extreme minus tap positions. Maximum current density in windings to be specified. Corrosion protection per Eskom spec 240-56030674, pollution level very heavy. Core steel, core dimensions, cross sectional areas, total core mass, design flux density, volts/turn, winding design details (including conductor size, insulation, current density, masses), inter-winding insulation details, oil quantities, masses, zero sequence impedances, filling medium for transport, and training of purchaser's staff must be provided in the Design Parameter and General Information Schedules. Training on components is to be provided, with details of how training will be conducted.

No specific compliance requirements beyond completing the technical schedules and providing test certificates are stated in the document.

This document sets out the technical evaluation criteria for Class 1 distribution power transformers and oil-immersed shunt reactors. It applies to interim tenders supplementing CORP4565 needs. The evaluation covers design, manufacturing, factory testing, shipment, transport, erection, commissioning, and after-sales technical support. Bidders must present, reference, and index all required information in Technical Schedules AB and associated annexures.

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Returnable documents:

• Schedule AB must be completely filled in, with no blanks or TBA entries. Where Schedule A shows 'xxxxxxxx', bidders must still provide a value or meaningful response.
• All technical information must be clearly indexed in the submission package.
• It is acceptable to submit a record of an already approved design if bidding with the same design.

Disqualification risks:

• Any mandatory requirement not met, including incomplete documents or missing information.
• Failure to score at least 80 points on discretionary requirements.
• Failure to pass the factory capability assessment (unless exempted).
• Failure to submit a corrective action plan within 60 days or implement corrections within 180 days after a factory assessment identifies gaps.

Evaluation stages:

1. Mandatory requirements (Annex A and B): completeness of documents and technical compliance. Any 'No' results in disqualification.
2. Discretionary requirements (Annex C): bidders must score at least 80 points out of the available discretionary points.
3. Factory capability assessment (Annex D): pre-contract requirement for each factory intended to produce units for Eskom.

Mandatory technical requirements include correct ratings (MVA and voltages), vector group, winding arrangement, tap changer positioning, and impedances as per Schedule A.

Discretionary scoring items include design evaluation (dielectric, forces, thermal, magnetic parameters), transport/shipping dimensions and weight, bushing technology, and tap changer type.

Factory assessment grading: 3 = Fully Compliant, 2 = Partially Compliant, 1 = Not Compliant. A fully compliant factory must be graded 3 on all facets.

Scope: Class 1 distribution power transformers and oil-immersed shunt reactors, as and when required over a five-year period.

Applicable standards and specifications:

• 240-60725684: Specification for oil immersed HV and EHV Power Reactors
• 240-68973110: Specification for power transformers rated above 1.25MVA and with highest voltage of 2.2kV or above
• 240-56062799: Capacitor Bushings for Application in Power Transformers and Shunt Reactors
• 240-105658000 (QM58): Supplier Quality Management Specification
• ISO 9001: Quality management systems
• IEC/SANS 60076: Transformer manufacturing compliance

Design evaluation parameters:

• Dielectric: maximum DIL stress of 7kV/mm per 240-68973110 Section 3.6.4
• Forces: ability to withstand short circuit per 240-68973110 Section 3.4.8
• Thermal: temperature rises at altitude of 1 800 m as per AB Schedules
• Magnetic: primary/secondary impedance at 75°C at rated MVA, design flux density at Un, and core design per 240-68973110 Section 3.5.1

Bushing requirements: dry or paperless technology with composite insulator, in line with specification 240-56062799. Clear drawings of selected items required; no full catalogues accepted.

Evaluation methodology: desktop exercise using tender returns and factory assessment. Bidders must meet all mandatory requirements and score at least 80 points on discretionary requirements. Factory capability assessments are mandatory for each factory intended to produce units for Eskom, with exemptions for valid accreditations.

Factory assessment covers design process flow, design tools and competence, design technology backup, design review records, R&D capabilities, manufacturing equipment, maintenance, tool control, plant capacity, capacity increase plans, core manufacturing methods (cutting, burr, stacking, assembly, winding, pressing), tank manufacturing methods, active part assembly, drying plant methods, auxiliary wiring, testing facilities, and quality management systems.

Factory capability assessment questionnaire covers:

• Factory profile: range of transformers manufactured, years of experience for each type.
• Design criteria basis and guidelines (electrical and mechanical).
• Design team composition, structure, numbers, and experience levels.
• Successful implementation of OD cooling design.
• Proof of designs passing short-circuit testing at an independent facility.
• Design safety factors/margins implemented (dielectric, thermal, forces, conductor yield strengths, infinite bus).
• Design process flow charts/systems for similar products.
• Internal design verification/validation processes.
• Process for design change requests (concessions).
• Engineering tools used and staff experience levels.
• Technology partners and use of academic/research institutions.
• Design review, type approval, and records for largest capacity and highest voltage units.
• R&D ownership and initiatives to reduce transformer losses.

Factory capability assessment verifies design capability, manufacturing capacity, quality management systems, testing facilities, engineering competence, and ability to consistently manufacture transformers compliant with IEC/SANS 60076. Assessments are conducted per QM58 and ISO 9001 Clause 8.4. Grading: 3 = Fully Compliant, 2 = Partially Compliant, 1 = Not Compliant. Corrective action plans required within 60 days, implementation within 180 days. Failure results in disqualification.

Quality management requirements include:

• ISO 9001 certification with scope covering design, manufacturing, supply, testing, refurbishment, and repair of transformers.
• Approved and current Welding Procedure Specification (WPS) displayed at point of use; qualified and certified welders.
• Approved, implemented, and signed-off Quality Control Plans (QCPs).
• Documented register of special processes per QM58, with controls to ensure consistent and effective execution.
• Pre-approved supplier list, incoming material inspection, material certificate review, and traceability from receipt through final delivery.
• Documented CAPA process for non-conformances; formal review and approval of deviations and concessions.
• Test equipment calibrated and traceable to national or international standards.
• HV testing facilities accredited against ISO/IEC 17025, or third-party verification by an accredited facility.

Factory capability assessment:

• Mandatory for each factory intended to produce units for Eskom, unless exempted by a valid accreditation or assessment report recognised by Eskom and issued within the preceding 24 months.
• Accreditation is granted based on the demonstrated capability of the manufacturing facility, not the commercial structure.
• Where a supplier is a distributor, agent, or local representative, the actual manufacturing facility must be assessed.

Quality management:

• QMS must be certified to ISO 9001, with the certified scope covering design, manufacturing, supply, testing, refurbishment, and repair of transformers.
• For multi-site certifications, the audited factory must be included in the certification schedule.

Testing facilities:

• HV testing facilities must be accredited against ISO/IEC 17025, or have third-party verification by an accredited facility.
• Test equipment must be calibrated and traceable to national or international standards.

Other compliance:

• Welding Procedure Specification (WPS) approved, current, and displayed at point of use; welders formally qualified and certified.
• Quality Control Plans (QCPs) approved, implemented, and signed off.
• Documented register of special processes per QM58.
• Material traceability maintained from receipt through manufacturing, assembly, testing, and final delivery.

Factory accreditation is a risk management and supplier qualification process. Accreditation is granted based on the demonstrated capability of the manufacturing facility, not the commercial structure through which products are offered. Eskom reserves the right to conduct additional assessment visits for non-conformances observed during factory acceptance tests.

Mandatory requirements:

• Completeness of documents: all required information submitted, no blanks or TBA. Missing information leads to disqualification.
• Technical requirements: ratings (MVA and voltages), vector group, winding arrangement, tap changer positioning, and impedances as per Schedule A. Non-compliance leads to disqualification.

Discretionary requirements: scored per Annex C; minimum 80 points required.

Factory capability assessment: mandatory for each factory intended to produce units for Eskom, unless exempted by valid accreditation not older than 24 months. Grading: 3 = Fully Compliant, 2 = Partially Compliant, 1 = Not Compliant. Corrective action plans required within 60 days, implementation within 180 days. Failure results in disqualification.

Technical evaluation criteria for Class 1 distribution power transformers. Bidders must meet all mandatory requirements and score a minimum of 80 points out of the discretionary requirements. Mandatory requirements include completeness of documents and technical requirements. Discretionary requirements are scored per Annex C. Factory capability assessment is a pre-contract requirement, mandatory for each factory intended to produce units for Eskom, with exemptions for valid accreditations. Assessment grades: 3 = Fully Compliant, 2 = Partially Compliant, 1 = Not Compliant. Corrective action plans required within 60 days, implementation within 180 days. Failure results in disqualification.

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an "as and when" required basis over a five (5) year period for distribution division. The technical schedules cover a 10MVA, 33/22kV YNyn0 power transformer.

Bidders must complete and sign the technical schedules (Schedule A and B) for the technical, design, and information schedules. Bidders must list any deviations in the deviation schedule with reasons and evidence of cost-effectiveness. Bidders must provide type test and routine test certificates. Bidders must provide a detailed list of recommended spares. Bidders must provide training on components. The document does not specify other eligibility criteria such as CSD registration, tax status, B-BBEE, or CIDB grading.

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an "as and when" required basis over a five (5) year period for distribution division.

Technical schedules A and B for a 10MVA, 33/22kV YNyn0 power transformer:

• Rated power: 10 MVA (ONAN), ONAF not applicable.
• Rated voltages: Primary 33 kV r.m.s, Secondary 22 kV r.m.s.
• Voltage tapping range: +5% to -15% of principal tapping ratio, in steps of 1.25%, with 17 positions (including transition positions).
• Resulting no-load voltage with MV constant: 33 kV on principal tapping, 34.65 kV on extreme plus tapping, 28.05 kV on extreme minus tapping.
• Transformer type: Core type, 3 limbs, vector group YNyn0, cooling ONAN.
• Operating environment: Corrosion protection per Eskom specification 240-56030674, pollution level very heavy.
• Maximum current density in windings: to be provided by bidder.
• Transformer losses: No plus tolerance allowed. No-load losses at 90%, 100% (used in financial evaluation), and 110% of rated power; load losses at extreme plus, nominal, and extreme minus tap positions (loss evaluation uses average of these three values).
• Losses for cooling equipment (fans): power and current to be provided.
• Primary/secondary impedance at 75°C at rated MVA: 6% on principal tapping, maximum on extreme plus tapping, >5% on extreme minus tapping. Tolerances per IEC on principal and extreme plus tapping; on extreme minus tapping +10% / -0%.
• Temperature rises at altitude of 1800 m: top oil 55°K, windings (by resistance) 60°K, hotspot of winding <73°K, hotspot of metal parts in contact with oil <80°K.
• Maximum acoustic noise: as per IEC.
• Heavy duty type: Yes.
• Minimum insulation for windings: Impulse withstand test voltage for line terminal: Primary 200 kV peak, Secondary 150 kV peak. Sixty-second separate source: Primary 70 kV r.m.s, Secondary 50 kV r.m.s. Sixty-second induced-overvoltage withstand test voltages: Primary to earth 66 kV r.m.s, Secondary 44 kV r.m.s.
• Main terminals & bushings: Outdoor type. Primary bushing and HV neutral terminal: stem size 26 x 125 mm, current rating 1000 A (incl 20% overcurrent), impulse withstand voltage at 1800m 250 kV peak, power frequency withstand voltage 95 kV r.m.s, total creepage 1612 mm, protected creepage (<50% of total) to be provided. Secondary bushing and LV neutral terminal: stem size 26 x 125 mm, current rating 315.29 A (incl 20% overcurrent), impulse withstand voltage at 1800m 200 kV peak, power frequency withstand voltage 70 kV r.m.s, total creepage 1116 mm, protected creepage to be provided.
• Physical arrangement: Compliance with Figure 2 & 3 required. Overall dimensions of complete unit: height 5500 mm, length 6400 mm, width 5000 mm. Transport dimensions and tank dimensions to be provided.
• Cooling equipment: Radiators material type and thickness to be provided; motors (forced cooling) make and type to be provided.
• Safe withstand vacuum at sea level: 1.5 kPa.
• Transformer oil type: per Eskom specification 240-75661431.
• Tap-changers: OLTC type. Tap-changer manufacturer, model, precise electrical location of tappings (Y-neutral end), diagrammatic arrangement drawing number, number of maintenance free operations 300000. Nominal 50 Hz ratings: voltage 33 kV, current (non-vacuum and vacuum type) 247.29 A. Insulation levels: phase-to-phase 200 kV peak; 50 Hz withstand phase-to-phase 70 kV r.m.s. Tap-changer contacts (selector, selector switch, diverter switch) and tie-in resistor details to be provided. Tap-changer driving motor type, supply voltage, power, and current to be provided.
• Drawings & manuals: Quantity of drawings as per 3.22: 1; quantity of manuals (hard copy + electronic): 5 + 1.
• Indicating and protective devices: Tap-changer protective device (detail) to be specified; pressure relief device per Eskom specification 240-56063871; oil- and gas-actuated relay per Eskom specification 240-56063908; conservator bag not required; dehydrating breathers per Eskom specification 240-56062529; oil level indicators per specification 240-56356191; oil temperature thermometer digital+analogue; winding temperature thermometer digital+analogue.
• Schedule of type test & routine test certificates submitted: Yes.
• Spares recommended by manufacturer: detailed list to be provided.

Design parameter schedules (Schedule A and B) require bidders to provide details on core steel (manufacturer, grade, thickness), core dimensions (window height, distance between core limb centres, core diameter, filling factor), cross sectional areas (wound limbs, yoke), total core mass, design flux density at Un for wound limbs and yoke, volts/turn, winding design (arrangement, conductor yield strength, and for each winding: type, number of turns, inner/outer diameter, radial build, electrical/magnetic height, conductor size/number/configuration, conductor insulation, current density, gradient winding - oil, number/width/thickness of support spacers per turn, total copper mass, dry insulation mass, total conductor mass), inter-winding insulation (number of barriers, barrier thickness, distance from windings, distance between barriers for CORE-LV, LV-HV, HV-TAP, and phase-to-phase).

General information schedule requires bidders to provide transformer general information (manufacturer, place of manufacture), oil quantities (transformer tank, tap-changer, radiators, conservator), masses (core steel, total dry insulation, total active part, tank and fittings, coolers, oil, greatest transportation mass), primary/secondary zero sequence impedances on principal, extreme plus, and extreme minus tapping, filling medium for transport, and training of purchaser's staff (training provided on components, details of how training will be conducted).

The tender covers the design, detailed engineering, manufacture, testing, supply, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an "as and when" required basis over a five-year period for distribution division. The technical schedules specify a 10MVA, 22/6.6kV YNyn0 power transformer with detailed requirements for performance, testing, and physical arrangement.

Bidders must be able to supply Class 1 power transformers and complete all required schedules. The document does not specify formal eligibility criteria such as CSD registration, tax clearance, B-BBEE requirements, or CIDB grading. Bidders must comply with the technical specification and provide all requested guarantees and particulars. The deviation schedule requires that any deviations must be justified as more cost-effective than the specified requirements. No other explicit eligibility criteria are stated in the provided content.

The tender is for the design, detailed engineering, manufacture, testing, supply, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an "as and when" required basis over a five-year period for distribution division.

Technical schedules A and B cover a 10MVA, 22/6.6kV YNyn0 power transformer.

Key technical requirements:

• Transformer class: Class 1
• Rated power: 2.5 MVA ONAN (continuous rated power for all tappings)
• Rated voltages: Primary 22 kV, Secondary 6.6 kV
• Voltage tapping range: +5% to -5% of principal tapping ratio, steps of 2.5%, 5 positions
• Vector group: YNyn0
• Type: Core type, 3 limbs
• Cooling: ONAN
• Pollution level: Very Heavy
• Corrosion protection: As per Eskom specification 240-56030674
• Temperature rises at altitude 1800 m: Top oil 55 K, windings 60 K, hotspot of winding < 73 K, hotspot of metal parts in contact with oil < 80 K
• Maximum acoustic noise: as per IEC
• Heavy duty type: YES
• Impulse withstand test voltage: Primary 150 kV peak, Secondary 75 kV peak
• Sixty-second separate source: Primary 50 kV r.m.s, Secondary 22 kV r.m.s
• Sixty-second induced-overvoltage: Primary to earth 44 kV r.m.s, Secondary 14 kV r.m.s
• Main terminals and bushings: Outdoor type, details specified for primary and secondary bushings including stem size, current rating, impulse withstand, power frequency withstand, total creepage
• Physical arrangement: Overall dimensions height 5500 mm, length 6400 mm, width 5000 mm; compliance with figures 2 and 3
• Safe withstand vacuum at sea level: 1.5 kPa
• Transformer oil type: As per Eskom specification 240-75661431
• Tap-changers: OCTS type, tappings at Y-neutral end, nominal 50 Hz ratings voltage 22 kV, current >80 A
• Drawings: 1 set as per clause 3.22; Manuals: 5 hard copies + 1 electronic
• Indicating and protective devices: Pressure relief device, oil- and gas-actuated relay, dehydrating breathers, oil level indicators, oil temperature thermometer (digital+analogue), winding temperature thermometer (digital+analogue) as per specified Eskom specifications
• No conservator bag required
• Losses: No plus tolerance allowed; no-load losses at 90%, 100% (used in financial evaluation), 110%; load losses at extreme plus, nominal, extreme minus tap positions; loss evaluation uses average of the three load loss values
• Primary/secondary impedance at 75°C at rated MVA: 6% on principal tapping, >5% on extreme minus tapping; tolerances per IEC, extreme minus tapping +10/-0
• Minimum insulation for windings: impulse withstand and power frequency withstand as specified
• Maximum current density in windings: to be provided by bidder
• Design parameter schedules require bidders to provide core steel details, core dimensions, cross-sectional areas, total core mass, design flux density, volts/turn, winding design details (type, turns, diameters, radial build, heights, conductor size, current density, masses), inter-winding insulation details
• General information schedule requires bidders to provide manufacturer, place of manufacture, oil quantities, masses, zero sequence impedances, filling medium for transport, and training details
• Tests: Type tests for first of design units only (temperature rise, acoustic noise); routine tests include lightning impulse, capacitances, short duration AC with partial discharge, zero sequence impedance, low voltage tests (frequency response analysis, ratio, magnetisation, impedance on all tap positions, winding DC resistance, bushings tan delta, overall winding insulation, insulation resistance, CT magnetisation and ratio); special test: chopped impulse
• Impact recorders on tank
• Off-loading: Supplier to off-load and transfer to operating position; rise/fall to off-loading position 500 mm
• Erection: Erected ready for service, including 4 layers x 4 mm (total 16 mm) Malthoid
• Spares recommended by manufacturer: detailed list required
• Schedule of type test and routine test certificates: Yes

The tender covers the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an "as and when" required basis over a five (5) year period for distribution division. The technical schedule specifies a 5MVA, 88/22kV YNd1 power transformer.

Bidders must complete the technical schedules (Schedule A and B) for the 5MVA transformer, providing guaranteed technical particulars. Bidders must complete the deviation schedule, listing any deviations with reasons and evidence of cost-effectiveness. Bidders must complete the design parameter schedule and general information schedule. The tender includes standard National Treasury forms (SBD/MBD) which must be completed, including declaration of interest, preference points claim, and certificate of independent bid determination. Bidders must be registered on the Central Supplier Database (CSD) and be tax compliant.

The tender is for the design, detailed engineering, manufacture, testing, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an "as and when" required basis over a five (5) year period for distribution division. The technical schedule specifies a 5MVA, 88/22kV YNd1 power transformer. Key technical requirements include:

• Continuous rated power: 5 MVA (ONAN cooling)
• Rated voltage: Primary 88 kV, Secondary 22 kV
• Voltage tapping range: +5% to -15% of principal tapping ratio, in 1.25% steps, 17 positions
• Vector group: YNd1
• Transformer type: Core, 3 limbs
• Operating environment: Very heavy pollution, corrosion protection per Eskom specification 240-56030674
• Temperature rises at altitude 1800 m: Top oil 55 K, windings 60 K, hotspot of winding < 73 K, hotspot of metal parts < 80 K
• Maximum acoustic noise: 77 dB(A)
• Heavy duty type: Yes
• Minimum insulation: Impulse withstand 450 kV peak (primary), 150 kV peak (secondary); 60-second separate source 95 kV r.m.s (primary), 50 kV r.m.s (secondary); induced-overvoltage 150 kV r.m.s (primary to earth), 44 kV r.m.s (secondary)
• Main terminals: Outdoor bushings; primary bushing stem 38 x 125 mm, impulse withstand 550 kV peak, power frequency withstand 230 kV r.m.s, total creepage 3813 mm; secondary bushing stem 26 x 125 mm, impulse withstand 200 kV peak, power frequency withstand 70 kV r.m.s, total creepage 1116 mm; neutral bushing similar to primary
• Overall dimensions: Height 5500 mm, length 6400 mm, width 5000 mm
• Tap-changer: OLTC, 300,000 maintenance-free operations, 44 kV, current >300 A (non-vacuum), phase-to-phase insulation 250 kV peak, 50 Hz withstand 95 kV r.m.s, driving motor 3-phase 400 V a.c
• Safe withstand vacuum: 1.5 kPa
• Transformer oil type: per Eskom specification 240-75661431
• Indicating and protective devices: pressure relief device per 240-56063871, oil- and gas-actuated relay per 240-56063908, dehydrating breathers per 240-56062529, oil level indicators per 240-56356191, digital+analogue oil and winding temperature thermometers
• Drawings: 1 set, manuals: 5 hard copy + 1 electronic
• Type tests (first of design units): temperature rise, acoustic noise level; routine tests: lightning impulse, capacitances, short duration AC with partial discharge, zero sequence impedance, low voltage tests (frequency response analysis, ratio, magnetisation, impedance on all tap positions, winding DC resistance, bushings tan delta, overall winding insulation, insulation resistance, CT magnetisation and ratio)
• No plus tolerance allowed on losses; loss evaluation uses average of load losses at extreme plus, nominal and extreme minus tap positions
• No-load loss at 100% will be used in financial evaluation
• Impedance on principal tapping: 10%; on extreme minus tapping: >9%; tolerances per IEC, extreme minus +10/-0
• Bidders must provide detailed test plan for evaluation of minimum insulation
• Bidders must complete Schedule B (guarantees and technical particulars) with their offered values for all items marked xxxxxxxxxx in Schedule A
• Deviations must be listed in the deviation schedule with reasons and evidence that they are more cost-effective

Bidders must be registered on the Central Supplier Database (CSD) and be tax compliant. Standard National Treasury forms (SBD/MBD) must be completed, including declaration of interest, preference points claim, and certificate of independent bid determination.

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an as-and-when required basis over a five-year period for the distribution division. The specific transformer covered by the technical schedules is a 2.5 MVA, 44/2.2 kV Yd9 power transformer.

Bidders must complete and sign the Technical Schedules, Deviation Schedule, Design Parameter Schedule, and General Information Schedule.

• The Deviation Schedule requires listing any deviations with reasons and evidence that the deviation is more cost-effective than the specified requirement.
• Bidders must provide a detailed list of recommended spares.
• No scoring split, preference point system, or minimum qualifying thresholds are stated.

The tender covers the design, detailed engineering, manufacture, testing, supply, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an as-and-when required basis over five years.

• Transformer rating: 2.5 MVA, 44/2.2 kV, vector group Yd9.
• Cooling: ONAN; continuous rated power 2.5 MVA.
• Voltage tapping range: +5% to -15% of principal ratio, steps of 1.25%, 17 positions.
• Impedance on principal tapping: 6%; extreme minus tapping minimum >5%; tolerances per IEC, extreme minus +10/-0.
• Temperature rises at 1 800 m altitude: top oil 55 K, windings 60 K, hotspot <73 K, metal parts <80 K.
• Insulation levels: primary impulse 250 kV peak, secondary 40 kV peak; 60-second power frequency primary 70 kV r.m.s, secondary 10 kV r.m.s.
• No-load losses at 100% (used in financial evaluation) and load losses at three tap positions must be stated; no plus tolerance allowed.
• Loss evaluation uses the average of load losses at extreme plus, nominal and extreme minus tap positions.
• Maximum acoustic noise per IEC.
• Heavy duty type: yes.
• Operating environment: very heavy pollution; corrosion protection per Eskom specification 240-56030674.
• Delivery: transformer delivered to works, off-loaded and transferred to operating position by supplier; rise/fall to off-loading position 500 mm; impact recorders on tank.
• Erection: erected ready for service; 4 layers x 4 mm Malthoid under base.
• Tests: type tests for first-of-design units (temperature rise, acoustic noise); routine tests include lightning impulse, short duration AC with partial discharge, low voltage tests (frequency response, ratio, magnetisation, impedance, winding DC resistance, bushing tan delta, overall insulation, insulation resistance, CT tests); special test: chopped impulse.
• Tap-changer: OCTS type, Y-neutral end, 300 000 maintenance-free operations, nominal 50 Hz ratings 33 kV / 46.4 A.
• Main terminals: outdoor bushings; primary current rating 1000 A, secondary 788 A, neutral 1000 A; creepage distances specified.
• Physical arrangement: overall dimensions 5500 mm high x 6400 mm long x 5000 mm wide; compliance with figures required.
• Oil type per Eskom specification 240-75661431; conservator bag not required.
• Drawings: 1 set; manuals: 5 hard copy + 1 electronic.
• Indicating devices: digital+analogue oil and winding temperature thermometers; pressure relief, oil/gas relay, dehydrating breathers per Eskom specifications.
• Design parameters to be completed: core steel, core dimensions, winding design details, inter-winding insulation.
• General information: manufacturer, place of manufacture, oil quantities, masses, zero sequence impedances, transport filling medium, training of purchaser's staff.

The tender covers the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an as-and-when required basis over a five-year period for Eskom's distribution division. The specific unit detailed in the technical schedules is a 20MVA, 132/22kV YNd1 power transformer.

Bidders must complete all technical schedules (Schedule A and B) for the 20MVA, 132/22kV YNd1 power transformer.

• Any deviations from the specification must be listed in the deviation schedule with reasons and evidence that the deviation is at least as cost-effective as the specified design.
• Type test certificates must be submitted for first-of-design units; Eskom may request type tests for any transformer.
• A detailed spares list recommended by the manufacturer must be provided.
• Training for purchaser's staff on components must be provided, with details of how training will be conducted.
• Bidders must comply with all referenced Eskom specifications (e.g., corrosion protection, pressure relief device, oil- and gas-actuated relay, dehydrating breathers, oil level indicators).
• Technical, design, and information schedules must be signed by the supplier, factory, and Eskom representatives.
• No explicit eligibility criteria such as CSD registration, B-BBEE, or CIDB grading are stated in the provided content.

The tender is for the design, detailed engineering, manufacture, testing, supply, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an as-and-when required basis over a five-year period for Eskom's distribution division.

Key technical requirements for the 20MVA, 132/22kV YNd1 power transformer:

• Rated power: 20 MVA (ONAN cooling); ONAF not applicable.
• Rated voltages: Primary 132 kV r.m.s, Secondary 22 kV r.m.s.
• Vector group: YNd1; core-type transformer with 3 limbs.
• Voltage tapping range: +5% to -15% of principal tapping ratio, in 1.25% steps, with 17 positions including transition positions.
• Resulting no-load voltage: 132 kV on principal tapping, 138.6 kV on extreme plus, 112.2 kV on extreme minus.
• Impedance at 75°C on principal tapping: 11%; extreme minus tapping minimum >10%; tolerances per IEC, with +10%/-0% on extreme minus.
• Temperature rises at 1800 m altitude: top oil 55°K, windings 60°K, hotspot of winding <73°K, hotspot of metal parts in contact with oil <80°K.
• Maximum acoustic noise: 77 dB(A).
• Insulation levels: Impulse withstand 550 kV peak (primary), 150 kV peak (secondary); 60-second separate source 95 kV r.m.s (primary), 50 kV r.m.s (secondary); induced-overvoltage 230 kV r.m.s (primary to earth), 44 kV r.m.s (secondary).
• Main terminals and bushings: outdoor type; primary bushing stem 38 x 125 mm, impulse withstand 650 kV peak, power frequency withstand 275 kV r.m.s, total creepage 4495 mm; secondary bushing stem 26 x 125 mm, impulse withstand 250 kV peak, power frequency withstand 95 kV r.m.s, total creepage >1612 mm; neutral bushing similar to primary.
• Overall dimensions of complete unit: height 5500 mm, length 6400 mm, width 5000 mm.
• Safe withstand vacuum at sea level: 1.5 kPa.
• Transformer oil type per Eskom specification 240-75661431.
• Tap-changer: OLTC, located at Y-neutral end, 300,000 maintenance-free operations; nominal ratings 44 kV, >300 A (non-vacuum); insulation levels phase-to-phase 250 kV peak, 50 Hz withstand 95 kV r.m.s; driving motor 3-phase, 400 V a.c.
• Cooling equipment: radiators; motors for forced cooling if applicable.
• Indicating and protective devices: tap-changer protective device, pressure relief device per Eskom spec 240-56063871, oil- and gas-actuated relay per 240-56063908, no conservator bag required, dehydrating breathers per 240-56062529, oil level indicators per 240-56356191, digital and analogue oil and winding temperature thermometers.
• Drawings and manuals: 1 set of drawings as per clause 3.22, 5 hard copies plus 1 electronic copy of manuals.
• Losses: no plus tolerance allowed; no-load losses at 90%, 100% (used in financial evaluation), and 110% of rated power; load losses at extreme plus, nominal, and extreme minus tap positions (evaluation uses average of the three); losses for cooling equipment (fans) to be provided.
• Maximum current density in windings to be provided.
• Heavy duty type: YES.
• Corrosion protection per Eskom specification 240-56030674; pollution level: Very Heavy.
• Delivery: transformer delivered to works info; supplier off-loads and transfers to intended operating position; rise/fall to off-loading position 500 mm; impact recorders on tank.
• Erection: erected ready for service; 4 layers x 4 mm (total 16 mm) of Malthoid.
• Tests: temperature rise (type), lightning impulse (routine), acoustic noise (type), capacitances (routine), short duration AC with partial discharge (routine), zero sequence impedance (routine), low voltage tests including frequency response analysis (factory and site), ratio, magnetisation, impedance on all tap positions, winding DC resistance, bushing tan delta and capacitance, overall winding insulation, insulation resistance, CT magnetisation and ratio (all routine).
• Design parameters to be completed in Schedule B: core steel manufacturer, grade, thickness; core dimensions (window height, limb centres, diameter, filling factor); cross-sectional areas; total core mass; design flux density; volts/turn; winding design details (type, turns, diameters, radial build, heights, conductor size, insulation, current density, gradient, spacers, masses) for LV, HV, and TAP windings; inter-winding insulation barriers and distances.
• General information to be completed: manufacturer, place of manufacture, oil quantities, masses (core steel, insulation, active part, tank, coolers, oil, greatest transportation mass), zero sequence impedances, filling medium for transport, training details.

Bidders must comply with all referenced Eskom specifications, including:

• Corrosion protection per 240-56030674.
• Pressure relief device per 240-56063871.
• Oil- and gas-actuated relay per 240-56063908.
• Dehydrating breathers per 240-56062529.
• Oil level indicators per 240-56356191.
• Transformer oil type per 240-75661431.
• No specific CSD, B-BBEE, or CIDB requirements are stated in the provided content.

The tender covers the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an "as and when" required basis over a five (5) year period for distribution division. The document provides technical schedules for a 10MVA, 44/11kV YNd1 power transformer, including purchaser's specific requirements and guarantees/technical particulars.

Bidders must complete and sign the technical schedules, deviation schedule, and provide guarantees and technical particulars in Schedule B. The document does not specify additional eligibility criteria such as CSD registration, tax clearance, B-BBEE, or CIDB grading.

The tender is for the design, detailed engineering, manufacture, testing, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an "as and when" required basis over a five (5) year period for distribution division.

Technical Schedules A and B for a 10MVA, 44/11kV YNd1 Power Transformer:

• Purchaser's specific requirements (Schedule A) and guarantees and technical particulars of equipment offered (Schedule B).
• SAP No: 185775.
• Class: Class 1.
• Delivery: Transformer delivered to Works Info; supplier off-loads and transfers to intended operating position; rise or fall to off-loading position 500 mm; impact recorders on tank.
• Erection: Erected ready for service; 4 layers x 4 mm (total 16 mm) of Malthoid.
• Tests: Type tests for first of design units only (Eskom may request for any transformer). Temperature rise tests (Type), Lightning Impulse Test (Routine), Chopped Impulse Test (Special), Acoustic noise level measurements (Type), Determination of capacitances (Routine), Short duration AC tests with partial discharge measurements (Routine), Zero sequence impedance measurement for three winding transformers (Routine), Low Voltage Tests (Routine): Frequency Response Analysis (Factory & Site), Ratio, Magnetisation, Impedance on extreme plus, nominal and extreme minus tap positions, Winding DC resistance on all taps, Bushings tan delta and capacitance, Overall winding insulation, Insulation resistance to earth, Current Transformer Magnetisation and ratio test.
• Continuous rated power: ONAN 10 MVA; ONAF N/A.
• Rated voltage: Primary 44 kV r.m.s; Secondary 11 kV r.m.s.
• Voltage tapping range: Max +5%, Min -15%, steps 1.25%, 17 positions.
• Resulting no-load voltage with MV constant: Principal tapping 44 kV, extreme plus 46.2 kV, extreme minus 37.4 kV.
• Transformer type: Vector group YNd1; CORE; 3 limbs; winding arrangement as specified; cooling ONAN.
• Operating environment: Corrosion protection per Eskom spec 240-56030674; pollution level Very Heavy.
• Maximum current density in windings: Primary (outer) and Secondary (inner) to be provided.
• Transformer losses: No plus tolerance allowed. No load losses at 90%, 100% (used in financial evaluation), 110%. Load losses at extreme plus, nominal, extreme minus tap positions. Loss evaluation uses average of the three load loss values.
• Losses for cooling equipment (fans): power and current to be provided.
• Primary/Secondary impedance at 75°C at rated MVA: Principal tapping 10%; extreme plus to be provided; extreme minus >9%. Tolerances per IEC; extreme minus +10/-0.
• Temperature rises at altitude 1800 m: Top oil 55°K, windings 60°K, hotspot of winding <73°K, hotspot of metal parts in contact with oil <80°K.
• Maximum acoustic noise: as per IEC.
• Heavy Duty Type: YES.
• Minimum insulation for windings: Impulse withstand test voltage for line terminal: Primary 250 kV peak, Secondary 95 kV peak. Sixty-second separate source: Primary 70 kV r.m.s, Secondary 28 kV r.m.s. Sixty-second induced-overvoltage withstand: Primary to earth 95 kV r.m.s, Secondary 22 kV r.m.s.
• Main terminals & bushings: Outdoor type. Primary bushing: stem 26 x 125 mm, current rating 1000 A (incl 20% overcurrent), impulse withstand at 1800m 250 kV peak, power frequency withstand 95 kV r.m.s, total creepage 1612 mm. Secondary bushing: stem 26 x 125 mm, current rating 630.58 A, impulse withstand 200 kV peak, power frequency withstand 70 kV r.m.s, total creepage 375.1 mm. Neutral terminal: stem 26 x 125 mm, current rating 1000 A, impulse withstand 250 kV peak, power frequency withstand 95 kV r.m.s, total creepage 1612 mm.
• Physical arrangement: Compliance with Figure 2 & 3. Overall dimensions: height 5500 mm, length 6400 mm, width 5000 mm. Transport dimensions and tank dimensions to be provided.
• Cooling equipment: radiators and motors details to be provided.
• Safe withstand vacuum at sea level: 1.5 kPA.
• Transformer oil type: per Eskom spec 240-75661431.
• Tap-changers: OLTC; tappings at Y-neutral end; 300000 maintenance free operations; nominal 50 Hz ratings: voltage 33 kV, current >185 A (non-vacuum and vacuum); insulation levels phase-to-phase 200 kV peak; 50 Hz withstand phase-to-phase 70 kV r.m.s; tie-in resistor used? Yes/No; driving motor details to be provided.
• Drawings & Manuals: 1 set of drawings as per 3.22; 5 hard copy + 1 electronic manuals.
• Indicating and protective devices: Tap-changer protective device to be specified; pressure relief device per Eskom spec 240-56063871; oil- and gas-actuated relay per Eskom spec 240-56063908; conservator bag required NO; dehydrating breathers per Eskom spec 240-56062529; oil level indicators per spec 240-56356191; oil temperature thermometer Digital+Analogue; winding temperature thermometer Digital+Analogue.
• Schedule of type test & routine test certificates submitted: Yes.
• Spares recommended by manufacturer: provide detailed list.

Design Parameter Schedules:

• Core steel: manufacturer, grade, thickness to be provided.
• Core dimensions: window height, distance between core limb centres, core diameter, filling factor to be provided.
• Cross sectional areas: wound limbs and yoke to be provided.
• Total core mass to be provided.
• Design flux density at Un for wound limbs and yoke to be provided.
• Volts/turn at the above flux densities to be provided.
• Winding design: winding arrangement (CORE / LV / HV / TAP), conductor yield strength, and for each winding (LV, HV, TAP): type, number of turns, inner/outer diameter, radial build, electrical/magnetic height, conductor size/number/configuration, conductor insulation, current density, gradient winding - oil, number/width/thickness of support spacers per turn, total copper mass, dry insulation mass, total conductor mass.
• Inter-winding insulation: CORE-LV, LV-HV, HV-TAP, phase to phase: number of barriers, barrier thickness, distance from windings, distance between barriers.

General Information Schedule:

• Transformer general information: manufacturer, place of manufacture.
• Oil quantities: transformer tank, tap-changer, radiators, conservator (main & tap-changer).
• Masses: core steel, total dry insulation, total active part, tank and fittings, coolers, oil, greatest transportation mass.
• Primary/Secondary zero sequence impedances on principal, extreme plus, extreme minus tapping.
• Filling medium for transport.
• Training of purchaser's staff: training provided on components (Yes); details provided of how training is going to be conducted on purchaser's staff (Yes).

Deviation Schedule:

• Any deviations offered to the specification must be listed with reasons, and evidence provided that the proposed deviation will be at least more cost-effective than that specified by Eskom.

No specific compliance requirements stated in the document.

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an "as and when" required basis over a five (5) year period for distribution division. The technical schedules cover a 45MVA, 132/22kV YNd1 power transformer.

Bidders must complete and sign the Technical Schedule, Deviation Schedule, Design Parameter Schedule, and General Information Schedule. The document does not specify other eligibility criteria such as CSD registration, tax clearance, or B-BBEE requirements.

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an "as and when" required basis over a five (5) year period for distribution division.

Technical Schedules A and B cover a 45MVA, 132/22kV YNd1 power transformer.

Key technical requirements:

• Continuous rated power: 45 MVA (ONAN), ONAF not applicable.
• Rated voltages: primary 132 kV r.m.s, secondary 22 kV r.m.s.
• Voltage tapping range: +5% to -15% of principal ratio, steps of 1.25%, 17 positions.
• Resulting no-load voltage: 132 kV principal, 138.6 kV extreme plus, 112.2 kV extreme minus.
• Vector group: YNd1, core type, 3 limbs, ONAN cooling.
• Operating environment: corrosion protection per Eskom spec 240-56030674, pollution level very heavy.
• No-load losses at 90%, 100%, 110% of rated power; 100% value used in financial evaluation. No plus tolerance allowed.
• Load losses at extreme plus, nominal, and extreme minus tap positions; evaluation uses average of the three.
• Primary/secondary impedance at 75°C on principal tapping: 11%; extreme minus tapping minimum >10%.
• Temperature rises at altitude 1800 m: top oil 55 K, windings 60 K, hotspot of winding <73 K, hotspot of metal parts in contact with oil <80 K.
• Maximum acoustic noise: 77 dB(A).
• Heavy duty type: yes.
• Insulation levels: impulse withstand primary 550 kV peak, secondary 150 kV peak; 60-second separate source primary 95 kV r.m.s, secondary 50 kV r.m.s; induced overvoltage primary to earth 230 kV r.m.s, secondary 44 kV r.m.s.
• Main terminals and bushings: outdoor type; primary bushing stem 38 x 125 mm, impulse withstand 650 kV peak, power frequency 275 kV r.m.s, total creepage 4495 mm; secondary bushing stem 26 x 125 mm, impulse withstand 200 kV peak, power frequency 70 kV r.m.s, total creepage >1116 mm; neutral bushing same as primary.
• Overall dimensions of complete unit: height 5500 mm, length 6400 mm, width 5000 mm.
• Safe withstand vacuum at sea level: 1.5 kPa.
• Transformer oil type per Eskom spec 240-75661431.
• Tap-changer: OLTC, tappings at Y-neutral end, maintenance-free operations 300000, nominal 50 Hz ratings voltage 44 kV, current >300 A (non-vacuum), insulation levels phase-to-phase 250 kV peak, 50 Hz withstand 95 kV r.m.s, driving motor 3 phase 400 V a.c.
• Drawings: quantity 1; manuals: 5 hard copy + 1 electronic.
• Indicating and protective devices: pressure relief device per Eskom spec 240-56063871, oil- and gas-actuated relay per Eskom spec 240-56063908, conservator bag not required, dehydrating breathers per Eskom spec 240-56062529, oil level indicators per spec 240-56356191, oil and winding temperature thermometers digital + analogue.
• Type test and routine test certificates to be submitted.
• Spares recommended by manufacturer to be listed.

Design Parameter Schedule requires bidders to provide core steel details, core dimensions, cross-sectional areas, core mass, design flux density, volts/turn, winding design details (type, turns, diameters, radial build, heights, conductor size/insulation, current density, masses), inter-winding insulation details.

General Information Schedule requires manufacturer, place of manufacture, oil quantities, masses (core steel, insulation, active part, tank, coolers, oil, greatest transportation mass), zero sequence impedances, filling medium for transport, and training of purchaser's staff (training on components and details of how training will be conducted).

Deviation Schedule: any deviations to the specification must be listed with reasons and evidence that the deviation is at least as cost-effective as specified.

The tender covers the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an "as and when" required basis over a five (5) year period for distribution division. The technical schedules specify a 1.25MVA, 22/11kV YNyn0 power transformer with detailed requirements for ratings, voltages, impedance, temperature rises, insulation levels, bushings, tap-changer, protective devices, losses, tests, drawings, manuals, and spares. Bidders must complete the Technical Schedules (A and B), Design Parameter Schedules, and Information Schedule, and list any deviations with justification.

Bidders must complete and sign the Technical Schedules (A and B), Design Parameter Schedules, and Information Schedule. The tender includes standard National Treasury forms (SBD/MBD) that must be completed, including SBD 4 (Declaration of Interest), SBD 6.1 (Preference Points Claim), SBD 6.2 (Declaration for Local Production and Content), SBD 8 (Declaration of Bidder's Past Supply Chain Management Practices), SBD 9 (Certificate of Independent Bid Determination), and an Authority to Sign/Board Resolution. Bidders must be registered on the Central Supplier Database (CSD) and be in good standing with SARS and the relevant professional bodies. Bidders must comply with the PPPFA 80/20 or 90/10 preference point system as applicable. Bidders must provide evidence of local production and content as required by SBD 6.2.

The tender covers the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an "as and when" required basis over a five (5) year period for distribution division.

Technical Schedules A and B specify a 1.25MVA, 22/11kV YNyn0 power transformer with the following key requirements:

• Rated power: 1.25 MVA (ONAN cooling only; ONAF not applicable)
• Rated voltages: Primary 22 kV r.m.s, Secondary 11 kV r.m.s
• Voltage tapping range: +5% to -5% of principal tapping ratio, in 2.5% steps, 5 positions
• Vector group: YNyn0; core type; 3 limbs
• Impedance at 75°C on principal tapping: 6%; extreme minus tapping minimum >5%; tolerances per IEC (+10%/-0% on extreme minus)
• Temperature rises at 1800 m altitude: top oil 55°K, windings 60°K, hotspot of winding <73°K, hotspot of metal parts in contact with oil <80°K
• Maximum acoustic noise: 59 dB(A)
• Heavy duty type: YES
• Insulation levels: impulse withstand 150 kV peak (primary), 95 kV peak (secondary); 60-second separate source 50 kV r.m.s (primary), 28 kV r.m.s (secondary); induced-overvoltage 44 kV r.m.s (primary to earth), 22 kV r.m.s (secondary)
• Main terminals/bushings: outdoor type; primary bushing stem 26 x 125 mm, current rating >40 A, impulse withstand 200 kV peak, power frequency withstand 70 kV r.m.s, total creepage 1116 mm; secondary bushing stem 26 x 125 mm, impulse withstand 150 kV peak, power frequency withstand 50 kV r.m.s, total creepage 682 mm; neutral HV and LV bushing same as primary
• Physical arrangement: overall dimensions height 5500 mm, length 6400 mm, width 5000 mm; compliance with Figures 2 & 3 required
• Safe withstand vacuum at sea level: 1.5 kPa
• Transformer oil type per Eskom specification 240-75661431
• Tap-changer: OCTS type, tappings at Y-neutral end, nominal voltage 22 kV, current >300 A (non-vacuum) or >40 A (vacuum), insulation levels phase-to-phase 150 kV peak and 50 kV r.m.s
• Indicating/protective devices: pressure relief device per 240-56063871, oil- and gas-actuated relay per 240-56063908, dehydrating breathers per 240-56062529, oil level indicators per 240-56356191, oil temperature thermometer digital + analogue, winding temperature thermometer digital + analogue; no conservator bag required
• Corrosion protection per Eskom specification 240-56030674; pollution level very heavy
• Losses: no plus tolerance allowed; no-load losses at 90%, 100% (used in financial evaluation), and 110% of rated power; load losses at extreme plus, nominal, and extreme minus tap positions (average used for loss evaluation); cooling equipment losses (fans) power and current
• Maximum current density in windings: primary (outer) and secondary (inner) to be stated
• Tests: temperature rise (type), lightning impulse (routine), acoustic noise (type), capacitances (routine), short duration AC with partial discharge (routine), zero sequence impedance (routine), frequency response analysis (routine), ratio, magnetisation, impedance on extreme plus/nominal/extreme minus taps, winding DC resistance on all taps, bushings tan delta and capacitance, overall winding insulation, insulation resistance to earth, CT magnetisation and ratio (all routine)
• Drawings: quantity 1 per 3.2.2; manuals: 5 hard copy + 1 electronic
• Type test and routine test certificates to be submitted
• Spares recommended by manufacturer to be listed

Design Parameter Schedules require bidders to provide details on core steel (manufacturer, grade, thickness), core dimensions (window height, distance between core limb centres, core diameter, filling factor), cross-sectional areas, total core mass, design flux density, volts/turn, winding design (type, turns, diameters, radial build, heights, conductor size/configuration/insulation, current density, gradient, spacers, copper mass, insulation mass, conductor mass) for LV, HV and TAP windings, and inter-winding insulation details (barriers, thickness, distances).

Information Schedule requires general information: manufacturer, place of manufacture, oil quantities (tank, tap-changer, radiators, conservator), masses (core steel, dry insulation, active part, tank and fittings, coolers, oil, greatest transportation mass), zero sequence impedances, filling medium for transport, and training of purchaser's staff (training provided on components, details of how training will be conducted).

Deviation schedule: any deviations offered must be listed with reasons and evidence that the deviation is at least as cost-effective as specified.

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an as-and-when required basis over a five-year period for Eskom's distribution division. The technical schedules specify a 40MVA, 132/11kV YNd1 power transformer with detailed performance, insulation, bushing, tap-changer, cooling, and testing requirements.

Unable to extract eligibility criteria

The tender covers the design, detailed engineering, manufacture, testing, supply, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an as-and-when required basis over a five-year period.

Specific technical requirements for the 40MVA, 132/11kV YNd1 transformer:

• Rated power: 40 MVA ONAN (no ONAF rating).
• Rated voltages: primary 132 kV, secondary 11 kV.
• Vector group: YNd1, core type, 3 limbs.
• Tapping range: +5% to -15% in 1.25% steps, 17 positions.
• No-load voltage on principal tapping: 132 kV; extreme plus: 138.6 kV; extreme minus: 112.2 kV.
• Impedance on principal tapping: 22%; extreme minus tapping minimum >20%; tolerances per IEC, with extreme minus tapping +10%/-0.
• Temperature rises at 1800 m altitude: top oil 55 K, windings 60 K, hotspot winding <73 K, hotspot metal parts <80 K.
• Maximum acoustic noise: 77 dB(A).
• Heavy duty type: Yes.
• Insulation levels: primary impulse 550 kV peak, secondary 95 kV peak; primary power frequency 95 kV r.m.s, secondary 28 kV r.m.s; induced overvoltage primary to earth 230 kV r.m.s, secondary 22 kV r.m.s.
• Bushings: outdoor type; primary stem 38 x 125 mm, impulse withstand 650 kV peak, power frequency 275 kV r.m.s, total creepage 4495 mm; secondary stem 26 x 125 mm, impulse withstand 200 kV peak, power frequency 70 kV r.m.s, total creepage >1116 mm; neutral bushing similar to primary.
• Overall dimensions: height 5500 mm, length 6400 mm, width 5000 mm.
• Safe withstand vacuum at sea level: 1.5 kPa.
• Tap-changer: OLTC, Y-neutral end, 300,000 maintenance-free operations, rated voltage 44 kV, current >300 A (non-vacuum), insulation phase-to-phase 250 kV peak and 95 kV r.m.s, driving motor 3-phase 400 V a.c.
• Cooling equipment: radiators; fans power and current to be specified.
• Transformer oil type per Eskom specification 240-75661431.
• Corrosion protection per Eskom specification 240-56030674; pollution level very heavy.
• No plus tolerance allowed on transformer losses; no-load losses at 90%, 100% (used in financial evaluation) and 110% of rated power; load losses at extreme plus, nominal and extreme minus tap positions (evaluation uses average of the three).
• Losses for cooling equipment (fans) to be specified.
• Maximum current density in windings to be specified.
• Type tests: temperature rise, acoustic noise level; routine tests: lightning impulse, capacitances, short duration AC with partial discharge, zero sequence impedance (three-winding), low voltage tests including frequency response analysis (factory and site), ratio, magnetisation, impedance on all tap positions, winding DC resistance, bushing tan delta and capacitance, overall winding insulation, insulation resistance, CT magnetisation and ratio.
• Type test certificates and routine test certificates to be submitted.
• Spares recommended by manufacturer to be listed.
• Drawings: quantity 1; manuals: 5 hard copy + 1 electronic.
• Indicating and protective devices: pressure relief device per Eskom spec 240-56063871, oil- and gas-actuated relay per 240-56063908, dehydrating breathers per 240-56062529, oil level indicators per 240-56356191, oil and winding temperature thermometers digital + analogue; no conservator bag required.
• Design schedule requires bidders to provide core steel details, core dimensions, cross-sectional areas, core mass, flux densities, volts/turn, winding design details (type, turns, diameters, radial build, heights, conductor size and insulation, current density, copper mass), inter-winding insulation barriers, and zero sequence impedances.
• Information schedule requires oil quantities, masses (core, insulation, active part, tank, coolers, oil, greatest transport mass), filling medium for transport, and training of purchaser's staff.
• Deviation schedule: any deviations must be listed with reasons and evidence that the deviation is more cost-effective than Eskom's specification.

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an as-and-when-required basis over a five-year period for Eskom's distribution division. The technical documentation specifies a 20MVA, 132/44/22kV YNa0d1 power transformer.

Bidders must complete and sign the Deviation Schedule, listing any deviations with reasons and evidence that the deviation is more cost-effective than the specified requirement.

Returnable forms include standard National Treasury forms: SBD 4 (Declaration of Interest), SBD 6.1 (Preference Points Claim), SBD 8 (Declaration of Bidder's Past Supply Chain Management Practices), and SBD 9 (Certificate of Independent Bid Determination).

Bidders must be registered on the Central Supplier Database (CSD) and hold a valid SARS tax clearance. B-BBEE status level is required for preference points.

The tender covers the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an as-and-when-required basis over a five-year period.

Key technical requirements for the 20MVA, 132/44/22kV YNa0d1 transformer:

• Continuous rated power: 14 MVA ONAN (70% of ONAF), 20 MVA ONAF, 10 MVA ONAN tertiary.
• Rated voltages: primary 132 kV, secondary 44 kV, tertiary 22 kV.
• Voltage tapping range: +5% to -15% of principal tapping ratio, in 1.25% steps, 17 positions.
• Vector group YNa0d1; core type; 3 limbs; cooling ONAN/ONAF.
• Temperature rises at 1 800 m altitude: top oil 55 K, windings 60 K, hotspot of winding < 73 K, hotspot of metal parts in contact with oil < 80 K.
• Maximum acoustic noise 80 dB(A).
• Heavy duty type: yes.
• Impulse withstand voltages: primary 550 kV peak, secondary 250 kV peak, tertiary 150 kV peak, neutral 110 kV peak.
• Sixty-second separate source withstand: primary, secondary and neutral 70 kV r.m.s, tertiary 50 kV r.m.s.
• Induced overvoltage withstand: primary to earth 230 kV r.m.s, secondary 95 kV r.m.s, tertiary 44 kV r.m.s.
• Primary/secondary impedance on principal tapping 11%, on extreme minus tapping >10%; tolerances per IEC, extreme minus tapping +10/-0.
• No plus tolerance allowed on transformer losses; loss evaluation uses the average of load losses at extreme plus, nominal and extreme minus tap positions.
• No-load loss at 100% is used in financial evaluation.
• Main terminals and bushings: outdoor oil/air type; primary bushing stem 38 x 125 mm, impulse withstand 650 kV peak, power frequency withstand 275 kV r.m.s, total creepage 4 495 mm; secondary bushing stem 38 x 125 mm, impulse withstand 550 kV peak, power frequency withstand 230 kV r.m.s, total creepage 3 813 mm; tertiary bushing stem 26 x 125 mm, impulse withstand 250 kV peak, power frequency withstand 95 kV r.m.s, total creepage 1 612 mm; neutral terminal stem 26 x 125 mm, impulse withstand 250 kV peak, power frequency withstand 95 kV r.m.s, total creepage 1 612 mm.
• Overall dimensions of complete unit: height 5 500 mm, length 6 400 mm, width 5 000 mm.
• Safe withstand vacuum at sea level 1.5 kPa.
• Tap-changer: OLTC, line end (CW), 300 000 maintenance-free operations, nominal 50 Hz ratings voltage 88 kV, current 493.99 A (both non-vacuum and vacuum types), insulation phase-to-phase 550 kV peak, 50 Hz withstand phase-to-phase 230 kV r.m.s.
• Transformer oil per Eskom specification 240-75661431.
• Corrosion protection per Eskom specification 240-56030674; pollution level very heavy.
• Indicating and protective devices: pressure relief device per 240-56063871, oil- and gas-actuated relay per 240-56063908, dehydrating breathers per 240-56062529, oil level indicators per 240-56356191, digital and analogue oil and winding temperature thermometers.
• Conservator bag required.
• Quantity of drawings as per clause 3.22: 1; quantity of manuals: 5 hard copy + 1 electronic.
• Type test and routine test certificates must be submitted.
• Manufacturer must provide a detailed list of recommended spares.
• Training of purchaser's staff on components is required, with details of how training will be conducted.
• Bidders must complete Technical Schedules A and B, the Design Parameter Schedule, and the General Information Schedule, providing guaranteed technical particulars.
• Deviations must be listed in the Deviation Schedule with reasons and evidence of cost-effectiveness.

Bidders must be registered on the Central Supplier Database (CSD) and be in good standing with SARS tax clearance.

B-BBEE status level is required for preference points.

Returnable forms include SBD 4 (Declaration of Interest), SBD 6.1 (Preference Points Claim), SBD 8 (Declaration of Bidder's Past Supply Chain Management Practices), and SBD 9 (Certificate of Independent Bid Determination).

This is a technical schedule for a 40 MVA, 132/33 kV YNd1 power transformer. The document comprises Technical Schedules A and B: Schedule A lists the purchaser's specific requirements, Schedule B is for the bidder's guarantees and technical particulars of the equipment offered. The pack also includes a deviation schedule, a design parameter schedule, and a general information schedule.

Bidders must complete and submit Technical Schedules A and B as part of the offer. Any deviations from the specification must be listed in the deviation schedule with reasons and evidence that the deviation is more cost-effective than the specified requirement. Type test and routine test certificates must be submitted. Loss evaluation will use the no-load loss at 100% rated power and the average of load losses at extreme plus, nominal, and extreme minus tap positions.

Supply of a 40 MVA, 132/33 kV, YNd1, class 1 power transformer, core type, 3 limbs, ONAN/ONAF cooling, heavy duty, for outdoor installation at an altitude of 1800 m. Continuous rated power: 160 MVA ONAN (70% of ONAF); ONAF rating not specified. Rated voltages: primary 132 kV, secondary 33 kV. Tapping range: +5% to -15% of principal tapping ratio in 1.25% steps, 17 positions. No-load voltage on principal tapping 132 kV, extreme plus 138.6 kV, extreme minus 112.2 kV. Impedance on principal tapping 11%, extreme minus >10%, extreme plus to be offered. Tolerances per IEC, extreme minus +10%/-0. Temperature rises at 1800 m: top oil 55 K, windings 60 K, hotspot of winding <73 K, hotspot of metal parts in contact with oil <80 K. Maximum acoustic noise 77 dB(A). Insulation levels: impulse withstand primary 550 kV peak, secondary 200 kV peak; 60-second separate source primary 95 kV, secondary 70 kV; induced overvoltage primary to earth 230 kV, secondary 66 kV. Bushings: outdoor type, primary stem 38 x 125 mm, secondary 26 x 125 mm, neutral 38 x 125 mm; primary and neutral impulse withstand 650 kV peak, secondary 250 kV peak; power frequency withstand primary and neutral 275 kV, secondary 95 kV; total creepage primary and neutral 4495 mm, secondary 1612 mm. Overall dimensions: height 5000 mm, length 10500 mm, width 4300 mm. Safe withstand vacuum at sea level 1.5 kPa. Transformer oil per Eskom specification 240-75661431. Tap-changer: OLTC, tappings at Y-neutral end, 300000 maintenance-free operations, nominal ratings voltage 44 kV, current (non-vacuum) >300 A, insulation phase-to-phase 250 kV peak, 50 Hz withstand phase-to-phase 95 kV, driving motor 3-phase 400 V a.c. Corrosion protection per Eskom specification 240-56030674, pollution level very heavy. Off-loading: supplier to off-load and transfer to operating position, rise/fall 500 mm. Erection: erected ready for service, 4 layers x 4 mm Malthoid (total 16 mm). Impact recorders on tank. Tests: temperature rise and acoustic noise as type tests; lightning impulse, capacitances, short duration AC with partial discharge, zero sequence impedance, and low voltage tests (frequency response, ratio, magnetisation, impedance on all tap positions, winding DC resistance, bushing tan delta, overall winding insulation, insulation resistance, CT magnetisation and ratio) as routine tests. Drawings: 1 set; manuals: 5 hard copies + 1 electronic. Indicating devices: pressure relief, oil/gas-actuated relay, dehydrating breathers, oil level indicators, digital and analogue oil and winding temperature thermometers per specified Eskom specifications; no conservator bag. Type test and routine test certificates to be submitted. Spares list to be provided. Design parameters to be completed in Design Parameter Schedule: core steel manufacturer, grade, thickness; core dimensions; cross-sectional areas; core mass; flux density; volts/turn; winding design details (type, turns, diameters, radial build, heights, conductor size, insulation, current density, gradient, spacers, masses); inter-winding insulation barriers and distances. General information to be provided: manufacturer, place of manufacture, oil quantities, masses (core steel, insulation, active part, tank, coolers, oil, greatest transport mass), zero sequence impedances, transport filling medium, training for purchaser's staff.

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an as-and-when required basis over a five-year period for the distribution division. The technical schedules specify a 10 MVA, 22/2.2 kV YNyn0 power transformer.

Bidders must complete and sign the Technical Schedule (Schedule A and B), the Deviation Schedule, the Design Parameter Schedule, and the General Information Schedule. A detailed test plan must be provided for evaluation. Type test and routine test certificates must be submitted. A detailed list of recommended spares must be provided. Bidders must confirm training on components and provide details of how training will be conducted.

The tender covers the design, detailed engineering, manufacture, testing, supply, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an as-and-when required basis over a five-year period for the distribution division. The technical schedules specify a 10 MVA, 22/2.2 kV YNyn0 power transformer with ONAN cooling, core type, 3 limbs, and a vector group of YNyn0. The transformer must be heavy duty type, with a pollution level of very heavy, and corrosion protection as per Eskom specification 240-56030674. The unit must be erected ready for service, with off-loading and transfer to the operating position by the supplier. The transformer must be delivered to Works Info, with a rise or fall to off-loading position of 500 mm. Impact recorders are required on the tank. The continuous rated power is 10 MVA ONAN, with ONAF not applicable. Rated voltages are 22 kV primary and 2.2 kV secondary. The voltage tapping range is +5% to -15% in steps of 1.25%, with 17 positions. No-load voltage on principal tapping is 22 kV, on extreme plus tapping 23.1 kV, and on extreme minus tapping 18.7 kV. Maximum current density in windings is to be specified by the bidder. Transformer losses: no load losses at 90%, 100% (used in financial evaluation), and 110% of rated power; load losses at extreme plus, nominal, and extreme minus tap positions, with loss evaluation using the average of the three values. No plus tolerance is allowed on losses. Losses for cooling equipment (fans) must be specified. Primary/secondary impedance at 75°C on principal tapping is 6%, on extreme plus tapping to be specified, and on extreme minus tapping greater than 5%. Tolerances on guaranteed impedances are per IEC, with extreme minus tapping tolerance +10% / -0%. Temperature rises at altitude of 1800 m: top oil 55 K, windings by resistance 60 K, hotspot of winding less than 73 K, hotspot of metal parts in contact with oil less than 80 K. Maximum acoustic noise as per IEC. Minimum insulation for windings: impulse withstand test voltage for primary line terminal 150 kV peak, secondary 40 kV peak; sixty-second separate source primary 50 kV r.m.s, secondary 10 kV r.m.s; sixty-second induced-overvoltage withstand primary to earth 44 kV r.m.s, secondary 6.6 kV r.m.s. Main terminals and bushings are outdoor type. Primary bushing details: stem size 26 x 125 mm, current rating 315.29164477141353 A, impulse withstand voltage at 1800 m 200 kV peak, power frequency withstand voltage 70 kV r.m.s, total creepage 1116 mm. Secondary bushing details: stem size 26 x 125 mm, current rating 3152.9164477141353 A, impulse withstand voltage at 1800 m 200 kV peak, power frequency withstand voltage 70 kV r.m.s, total creepage 1116 mm. Physical arrangement must comply with Figures 2 and 3. Overall dimensions of complete unit: height 5500 mm, length 6400 mm, width 5000 mm. Transport dimensions and weight to be specified. Tank base plate type, length, and thickness to be specified. Cooling equipment: radiators material type and thickness to be specified; motors make and type to be specified. Safe withstand vacuum at sea level is 1.5 kPa. Transformer oil type per Eskom specification 240-75661431. Tap-changers: type OCTS, with manufacturer, model number, and precise electrical location of tappings at Y-neutral end to be specified. Number of maintenance free operations is 300000. Nominal 50 Hz ratings of tap-changer: voltage 22 kV, current 370.93134678989827 A (both non-vacuum and vacuum type). Insulation levels of tap-changer phase-to-phase 150 kV peak, 50 Hz withstand phase-to-phase 50 kV r.m.s. Tap-changer contacts (selector, selector switch, diverter switch) and tie-in resistor details to be specified. Tap-changer driving motor type, supply voltage, power, and current to be specified. Drawings and manuals: 1 set of drawings as per clause 3.2.2, 5 hard copy plus 1 electronic manual. Indicating and protective devices: tap-changer protective device to be specified, pressure relief device per Eskom specification 240-56063871, oil- and gas-actuated relay per Eskom specification 240-56063908, conservator bag not required, dehydrating breathers per Eskom specification 240-56062529, oil level indicators per specification 240-56356191, oil temperature thermometer digital and analogue, winding temperature thermometer digital and analogue. Type test and routine test certificates must be submitted. A detailed list of recommended spares must be provided. Tests: temperature rise tests (type), lightning impulse test (routine), chopped impulse test (special), acoustic noise level measurements (type), determination of capacitances (routine), short duration AC tests with partial discharge measurements (routine), zero sequence impedance measurement for three winding transformers (routine), low voltage tests including frequency response analysis (factory and site), ratio, magnetisation, impedance on extreme plus, nominal and extreme minus tap positions, winding DC resistance on all taps, bushings tan delta and capacitance, overall winding insulation, insulation resistance to earth, current transformer magnetisation and ratio test (all routine).

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an as-and-when required basis over a five-year period for Eskom's distribution division.

The technical schedules cover a 160 MVA, 132/66/22 kV, YNa0d1 power transformer, with Schedule A setting out the purchaser's specific requirements and Schedule B for the bidder's guarantees and technical particulars.

Returnable documents — the Technical Schedule, Deviation Schedule, Design Parameter Schedule and Information Schedule must be completed, signed and submitted with the bid.

Deviation Schedule — any deviation from the specification must be listed with reasons and evidence that it is more cost-effective than the specified design.

Signatures — the schedules require signatures from the supplier, the factory and Eskom.

Disqualification risks — incomplete or unsigned schedules, or deviations offered without the required justification and evidence.

Bidders must complete and sign the Technical Schedule, Deviation Schedule, Design Parameter Schedule and Information Schedule.

Loss evaluation — no-load losses at 100% of rated power will be used in the financial evaluation; load losses will be evaluated using the average of the extreme plus, nominal and extreme minus tap positions.

No plus tolerance is allowed on transformer losses.

Compliance with the referenced Eskom specifications is required for corrosion protection, pressure relief device, oil- and gas-actuated relay, dehydrating breathers and oil level indicators.

No other eligibility criteria (e.g., CSD registration, B-BBEE, CIDB grading) are stated in the provided document.

Equipment — a 160 MVA, 132/66/22 kV, YNa0d1, three-limb, core-type power transformer, Class 1, with ONAN/ONAF cooling.

Rated power — 112 MVA ONAN (70% of ONAF), 160 MVA ONAF, 10 MVA ONAN tertiary.

Voltages — primary 132 kV r.m.s, secondary 66 kV r.m.s, tertiary 22 kV r.m.s.

Tapping range — +5% to -15% of the principal tapping ratio in 1.25% steps, 17 positions including transition positions.

Impedances — primary/secondary 10% on principal tapping (minimum 9% on extreme minus); primary/tertiary 55% on principal tapping (minimum 50% on extreme minus). Tolerances per IEC on principal and extreme plus; +10% / -0% on extreme minus.

Temperature rises at 1 800 m altitude — top oil 55 °K, windings 60 °K, hotspot of winding < 73 °K, hotspot of metal parts in contact with oil < 80 °K.

Maximum acoustic noise — 80 dB(A).

Insulation levels — impulse withstand: primary 550 kV peak, secondary 350 kV peak, tertiary 150 kV peak, neutral 110+ kV peak; 60-second separate source: primary, secondary and neutral 38+ kV r.m.s, tertiary 50 kV r.m.s; 60-second induced overvoltage: primary to earth 230 kV r.m.s, secondary 140 kV r.m.s, tertiary 44 kV r.m.s.

Bushings — outdoor oil/air type; primary stem 38 x 125 mm, impulse withstand 650 kV peak, power frequency withstand 275 kV r.m.s, total creepage > 4 495 mm; secondary stem 38 x 125 mm, impulse withstand 450 kV peak, power frequency withstand 155 kV r.m.s, total creepage > 2 247.5 mm; tertiary stem 26 x 125 mm, impulse withstand 200 kV peak, power frequency withstand 70 kV r.m.s, total creepage > 744 mm; neutral stem 38 x 125 mm, impulse withstand 450 kV peak, power frequency withstand 155 kV r.m.s, total creepage > 2 247.5 mm.

Physical arrangement — overall dimensions: height 5 500 mm, length 6 400 mm, width 5 000 mm; compliance with Figures 2 and 3 required.

Tap-changer — OLTC, line end (CW), 300 000 maintenance-free operations, 66 kV, 987.979 A (both non-vacuum and vacuum), phase-to-phase insulation 350 kV peak, 50 Hz withstand 140 kV r.m.s, 3-phase driving motor at 400 V a.c.

Safe withstand vacuum at sea level — 1.5 kPa.

Transformer oil — per Eskom specification 240-75661431.

Corrosion protection — per Eskom specification 240-56030674; pollution level very heavy.

Heavy duty type — yes.

Tests — temperature rise and acoustic noise are type tests; lightning impulse, chopped impulse, capacitance determination, short duration AC with partial discharge, zero sequence impedance, and all low voltage tests (frequency response, ratio, magnetisation, impedance on all tap positions, winding DC resistance, bushing tan delta, overall winding insulation, insulation resistance, CT magnetisation and ratio) are routine tests. Type tests are for first-of-design units only, but Eskom may request them for any transformer.

Drawings and manuals — 1 set of drawings as per clause 3.22; 5 hard copy plus 1 electronic manual.

Indicating and protective devices — pressure relief device per 240-56063871, oil- and gas-actuated relay per 240-56063908, dehydrating breathers per 240-56062529, oil level indicators per 240-56356191; conservator bag required; oil and winding temperature thermometers digital plus analogue.

Training — training on components and details of how training will be conducted on purchaser's staff must be provided.

Spares — a detailed list of manufacturer-recommended spares must be provided.

Type test and routine test certificates — schedule of certificates must be submitted.

Compliance with the referenced Eskom specifications is required for corrosion protection (240-56030674), pressure relief device (240-56063871), oil- and gas-actuated relay (240-56063908), dehydrating breathers (240-56062529), oil level indicators (240-56356191) and transformer oil (240-75661431).

No other compliance requirements (e.g., CSD registration, B-BBEE, CIDB) are stated in the provided document.

Scope: design, detailed engineering, manufacture, testing, supply, installation, and commissioning of Class 1 power transformers (2.5 MVA, 88/6.6 kV YNd1) for Eskom Distribution Division on an as-and-when-required basis over 5 years.

Returnable documents — all must be completed, signed and submitted: - Technical Schedules A and B (purchaser-specific requirements and guarantees/technical particulars). - Deviation Schedule: list all proposed deviations with justification and cost-effectiveness evidence. - SBD 1 (Invitation to Bid): bidder and contact details as the offer cover page. - SBD 4 (Declaration of Interest): disclosure of any state employment or connections to the department. - SBD 6.1 (Preference Points Claim): B-BBEE points claim under PPPFA. - SBD 6.2 (Declaration for Local Production and Content). - SBD 8 (Declaration of Bidder's Past Supply Chain Management Practices). - SBD 9 (Certificate of Independent Bid Determination): no collusion or price disclosure. Disqualification risks: - Any returnable form left unsigned or omitted. - Incomplete or unsigned technical schedules or deviation schedule.

Evaluation stages: - Technical compliance: mandatory pass/fail based on completion of Technical Schedules A and B and adherence to specifications. - Deviation assessment: proposed deviations must be justified and proven cost-effective. - Preference points: B-BBEE scoring via SBD 6.1 under PPPFA. No minimum qualifying thresholds or scoring split stated.

Scope: design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an as-and-when-required basis over 5 years for Eskom Distribution Division.

Transformer specifications: - Rating: 2.5 MVA, 88/6.6 kV, YNd1 vector group. - Type: Core, 3-limb, ONAN cooling. - Voltage tapping range: +5% to -15% in 17 steps of 1.25%. - No-load voltage: 88 kV (principal), 92.4 kV (extreme plus), 74.8 kV (extreme minus). - Impedance at 75°C: 6% on principal tapping, >5% on extreme minus tapping. - Temperature rises at 1800 m altitude: top oil 55°K, windings 60°K, hotspot <73°K. - Maximum acoustic noise: 71 dB(A). - Insulation: impulse withstand 450 kV (primary), 75 kV (secondary); 60-second withstand 95 kV (primary), 20 kV (secondary). - Bushings: primary (38x125 mm, 550 kV impulse, 230 kV r.m.s), secondary (26x125 mm, 200 kV impulse, 70 kV r.m.s), neutral (38x125 mm, 550 kV impulse, 230 kV r.m.s). - Tap-changer: OLTC, 300,000 maintenance-free operations, Y-neutral end, 44 kV, >300 A (non-vacuum). - Corrosion protection: as per Eskom specification 240-56030674. - Pollution level: Very Heavy. - Dimensions: height 5500 mm, length 6400 mm, width 5000 mm. - Tests: routine tests include lightning impulse, acoustic noise, capacitance, short-duration AC with partial discharge, low-voltage tests (FRA, ratio, magnetisation, impedance, DC resistance, tan delta, insulation resistance). Type tests include temperature rise and acoustic noise level measurements. - Heavy Duty Type: Yes. - Oil type: Eskom specification 240-75661431. - Drawings and manuals: 1 hard copy drawing, 5 hard copy manuals + 1 electronic. - Indicating/protective devices: pressure relief (Eskom spec 240-56063871), oil/gas-actuated relay (Eskom spec 240-56063908), dehydrating breathers (Eskom spec 240-56062529), oil level indicators (Eskom spec 240-56356191), oil/winding temperature thermometers (digital + analogue). - Spares: detailed list required. - Training: provided on components with method details.

Returnable forms: - SBD 1, SBD 4, SBD 6.1, SBD 6.2, SBD 8, SBD 9. No explicit CIDB grading, CSD registration, tax compliance, or B-BBEE level requirements stated in the document.

The tender is for the design, detailed engineering, manufacture, testing, supply, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an as-and-when required basis over a five-year period for Eskom's distribution division. This document covers the technical schedules for a 10 MVA, 88/33 kV YNd1 power transformer.

Bidders must complete and sign the Technical Schedule, Deviation Schedule, Design Parameter Schedule, and General Information Schedule. The document does not specify additional eligibility criteria such as CSD registration, tax clearance, or B-BBEE requirements.

The tender covers the supply of a 10 MVA, 88/33 kV YNd1 Class 1 power transformer.

• Delivery: transformer delivered to site, off-loaded and transferred to operating position by supplier; off-loading rise/fall 500 mm.
• Erection: erected ready for service; 4 layers x 4 mm (total 16 mm) Malthoid base required.
• Tests: routine tests include lightning impulse, capacitances, short duration AC with partial discharge, zero sequence impedance, frequency response analysis (factory and site), ratio, magnetisation, impedance on all tap positions, winding DC resistance, bushing tan delta, overall winding insulation, insulation resistance, CT magnetisation and ratio. Type tests (temperature rise, acoustic noise) for first-of-design units; Eskom may request type tests for any transformer.
• Ratings: continuous ONAN 10 MVA; primary 88 kV, secondary 33 kV; tapping range +5% to -15% in 1.25% steps, 17 positions.
• No-load voltages: 88 kV principal, 92.4 kV extreme plus, 74.8 kV extreme minus.
• Transformer type: core type, 3 limbs, vector group YNd1, ONAN cooling.
• Operating environment: corrosion protection per Eskom spec 240-56030674; pollution level very heavy.
• Losses: no plus tolerance allowed; no-load losses at 90%, 100% (used in financial evaluation) and 110%; load losses at extreme plus, nominal and extreme minus taps (evaluation uses average of three).
• Impedance at 75°C: 10% on principal tapping, >9% on extreme minus; tolerances per IEC, extreme minus +10/-0.
• Temperature rises at 1800 m altitude: top oil 55 K, windings 60 K, hotspot <73 K, metal parts <80 K.
• Maximum acoustic noise: 73 dB(A).
• Heavy duty type: yes.
• Insulation levels: primary impulse 450 kV peak, secondary 200 kV peak; 60-second separate source primary 95 kV, secondary 70 kV; induced overvoltage primary 150 kV, secondary 66 kV.
• Bushings: outdoor type; primary stem 38 x 125 mm, impulse 550 kV, power frequency 230 kV, total creepage 3813 mm; secondary stem 26 x 125 mm, impulse 250 kV, power frequency 95 kV, total creepage 1612 mm; neutral similar to primary.
• Physical arrangement: compliance with figures; overall dimensions height 5500 mm, length 6400 mm, width 5000 mm.
• Safe withstand vacuum at sea level: 1.5 kPa.
• Oil type per Eskom spec 240-75661431.
• Tap-changer: OLTC, Y-neutral end, 300,000 maintenance-free operations; nominal 50 Hz ratings 44 kV, current >300 A (non-vacuum); insulation phase-to-phase 250 kV peak, 95 kV r.m.s; driving motor 3-phase 400 V a.c.
• Drawings: 1 set per clause 3.22; manuals 5 hard copy + 1 electronic.
• Protective devices: pressure relief per spec 240-56063871, oil/gas relay per 240-56063908, no conservator bag, dehydrating breathers per 240-56062529, oil level indicators per 240-56356191, digital+analogue oil and winding temperature thermometers.
• Type and routine test certificates to be submitted.
• Spares: manufacturer's recommended list required.
• Design parameters to be completed: core steel manufacturer, grade, thickness; core dimensions; cross-sectional areas; core mass; flux densities; volts/turn; winding design details (type, turns, diameters, radial build, heights, conductor size, insulation, current density, masses) for LV, HV and tap windings; inter-winding insulation barriers.
• General information to be completed: manufacturer, place of manufacture, oil quantities, masses (core steel, insulation, active part, tank, coolers, oil, greatest transport mass), zero sequence impedances, transport filling medium, training of purchaser's staff.
• Deviation schedule: any deviations must be listed with reasons and evidence that the deviation is more cost-effective than specified.

The eTendering system is a web-based platform that replaces manual submission of tender documents at Eskom offices. Suppliers must register on the system, verify their email, and use a one-time PIN to log in. The system allows uploading of tender documents under the correct category. The document provided is a help manual for the eTendering system, not the tender specification.

For problems with the Tender Bulletin, eTendering, or OpenText systems, contact the buyer responsible for the published tender. No specific contact details are provided.

Bidders must submit electronically via the Eskom eTendering system at https://eTendering.eskom.co.za. Registration on the system is required before access is granted; a one-time PIN is sent to the registered cellphone and email. A CSD number is required to gain access. Upload documents under the correct category (technical, commercial, finance, etc.). Each file must not exceed 50MB and the total of all files must not exceed 900MB. Finalise the submission by clicking 'Finalize Submission' and then 'Finalise and Close Submission'. After finalisation, an email with the submission ID is sent; keep this email for future enquiries. Bidders must verify all required documents are uploaded before finalising.

No evaluation criteria are stated in the available document. Bidders must have a CSD number to access the eTendering system.

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an 'as and when' required basis over a five-year period for the distribution division. The document provided is a supplier help manual for the eTendering system, not the technical specification document.

Bidders must have a valid CSD number to access the eTendering system. No other compliance requirements are stated in the available document.

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Bidders must submit a signed coating manufacturer's data sheet with the tender. All coatings must be from the same manufacturer; compatible locally available alternatives required for overseas-painted equipment. Bidders must comply with referenced standards: SABS SM 772/SANS 5772, SABS SM 769/SANS 5769, SABS 1091:2004, SABS ISO 1461, SABS ISO 2808, SANS 10064, ISO 8501-1, SIS 055900, ASTM E376. No other eligibility criteria (e.g., CSD registration, B-BBEE, CIDB grading) are stated in the provided document.

This document is a standard for corrosion protection and maintenance painting of new and in-service transformers and reactors. It applies to all new, refurbished, maintained, repaired and completely repainted transformers and reactors across Eskom Holdings Limited Divisions.

Coating material composition:

• A signed copy of the coating manufacturer's data sheet(s) must be submitted with the tender.
• All paint systems must provide protection in C5 (Very High Marine and Industrial) environments as classified by ISO, with high durability and maintenance intervals exceeding 15 years in C5.
• All coats on a given system must come from the same coating manufacturer. For overseas-painted equipment, compatible locally available alternatives must be provided by the OEM.
• Where a primer coat was applied in the factory, the contractor must check compatibility of proposed coatings with the primer.
• All coatings for Eskom Transmission must be solvent based; water based coatings only with special written approval.

Surface preparation:

• Degreasing: Remove all oil, grease and harmful deposits. Use water-based degreaser, followed by high-pressure washing with municipal grade water. Allow to dry completely before coating.
• Abrasive blast cleaning: Welds must be free of slag, inclusions and pinholes; remove weld spatter. Blast on dry surfaces with dry air, relative humidity below 85%, ambient temperature above +5°C. Primer coat within 4 hours or same working shift if cleanliness maintained; never leave blast cleaned surfaces uncoated overnight. Blasting media must meet quality requirements (pH not below 6.20, conductivity of water-soluble salts not exceeding 150 μS/cm, moisture content not exceeding 0.5%, minimum hardness 6 on Moh's scale, specific gravity minimum 2.5, maximum free silica 1% by weight, free of oil, grease, clay, humus, chlorides and bitumen). Remove all blasting media and dust after blasting; dispose of used and unused media at approved facility. Protect cables, bushings, nameplates, gauge glasses and other equipment during on-site blasting.
• Mechanical wire-brushing or grinding: Only for repairs and maintenance on already painted units. Remove oil and grease first. Do not prepare bushing base flanges, aluminium tapchanger head covers, hot dipped galvanised parts and protective devices for painting. For complete repaint, sand entire surface to remove old paint residue.

Application of coatings:

• All work under supervision of an experienced supervisor. Coatings must be smooth, continuous, free from sags and runs. Stripe coat boltholes, edges and corrosion-prone areas.
• Surfaces resting on concrete or inaccessible after erection must receive full coating system before erection; additional stripe coat on base edges before lowering onto plinth.
• Touch up paintwork damaged during transport or erection. Mask labels and areas not to be painted; remove any overspray.
• Spot repairs must extend at least 25 mm beyond damaged areas and reinstate each previous coat.
• No cleaning or coating when site conditions adversely affect operations. Contractor provides protective equipment to prevent contamination.
• Store newly primed steelwork clear of ground on trestles; ensure drainage. Storage of galvanized components per SABS ISO 1461.
• Protect equipment nameplates and identification plates from coatings. For site installed units, remove cables from cable rails before surface preparation; secure with stainless steel strapping after final coat.

Coating systems and thicknesses:

• External new units: Blast to SA 2.5 (ISO 8501-1:2007). Primer: twin-pack zinc rich or general purpose epoxy, >80% zinc by weight in dry film, typical 90 microns (70-110). Stripe coat edges and crucial areas with same material but different colour. Intermediate: twin-pack high build MIO pigmented epoxy, typical 150 microns (140-160). Top coat: twin-pack high build aliphatic polyurethane acrylic, typical 70 microns (60-80). Total dry film thickness typical 310 microns (270-350).
• External maintenance: Surface prep by mechanical wire-brushing, blast cleaning or grinding. Same coating system and thicknesses as new units.
• Internal new units: Paint must be unaffected by transformer oil at operating temperatures and must not influence dissolved gas analysis. Blast to Grade Sa 2.5. Internal coating: twin-pack high-solid high-build epoxy primer, typical 70 microns (60-80).
• Blanking covers: Same system as external new units.
• Terminal boxes and marshalling kiosks: External per external new units; internal twin-pack high-solid high-build epoxy primer, typical 70 microns (60-80).

Coating colour:

• Each coat a different colour from previous. Stripe coat same type as first coat but different colour.
• Topcoat colour: Cloud Grey SABS F48 (RAL 7035) for all new, refurbished and completely repainted units. Entire transformer (main tank, pipe work, conservator) same colour.
• Older transformers: Dark Admiralty or Battleship Grey G13 with white conservator; maintenance uses original colour, complete repaint uses Cloud Grey SABS F48.
• Internal main tank primer: brilliant white. Terminal boxes and marshalling kiosks external same as main tank, internal brilliant white.

Quality control:

• During blast cleaning, relative humidity must not exceed 85% and ambient temperature must be above 5°C.
• Finish for wire brushed and blast cleaned surfaces per ISO 8501-1 or SIS 055900.
• Blast profile roughness measured per SABS 772, as specified by material manufacturer's technical note. Blast profile (Sa 2.5) must not exceed specified thickness of primer or first coat. Severely corroded surfaces with profiles >40 microns require an additional primer coat; agree on suitable profile range with coating manufacturer.
• Application method and drying times as per product data sheet submitted with tender and approved by Purchaser.
• Coating thickness measured per ASTM E376 or SABS ISO 2080 on contaminant-free surfaces using calibrated electronic instruments. In disputes, both inspectors' dry film thickness testers re-calibrated; percentage variation applied as standard deviation.
• Each coat thickness must be within specified ranges; no individual reading below minimum or above maximum. Deficient film thickness rectified at Contractor's expense to Purchaser's approval. Excessive thickness per Manufacturer's recommended maximum.
• Paintwork considered defective if latent defects appear during guarantee period that could lead to general breakdown of coating system.

Technical evaluation and final approval:

• This specification serves as a minimum requirement for contractors supplying new transformers and reactors, performing complete refurbishment, and/or doing site repairs and maintenance.
• Any deviation from this specification must be approved by Eskom Transmission in writing.
• Alternatives will be considered; final written approval provided once technical evaluation completed and paint application system found compliant with this specification and Eskom Transmission requirements.

The tender is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an 'as and when' required basis over a five-year period for the distribution division. The specific transformer covered in the technical schedules is a 10MVA, 88/6.6kV YNd1 power transformer.

Returnable documents: bidders must complete and sign the technical schedules (Schedule A and B), the deviation schedule, and the standard National Treasury forms (SBD/MBD) including declaration of interest, preference points claim, local production declaration, and certificate of independent bid determination. No specific submission channel or format is stated in the provided content.

Bidders must complete and sign the technical schedules (Schedule A and B) and the deviation schedule. The tender includes standard National Treasury forms (SBD/MBD) which must be completed, including declaration of interest, preference points claim, local production declaration, and certificate of independent bid determination. No specific eligibility criteria such as CSD registration, CIDB grading, or B-BBEE thresholds are stated in the provided content.

The tender is for a 10MVA, 88/6.6kV YNd1 power transformer, Class 1, with ONAN cooling. Key technical requirements include:

• Rated power: 10 MVA (ONAN), ONAF not applicable.
• Rated voltages: primary 88 kV, secondary 6.6 kV.
• Tapping range: +5% to -15% of principal tapping ratio, in 1.25% steps, 17 positions.
• Vector group: YNd1, core type, 3 limbs.
• Impedance on principal tapping: 10%, extreme minus tapping >9%, tolerances per IEC with +10/-0 on extreme minus.
• Temperature rises at 1800 m altitude: top oil 55 K, windings 60 K, hotspot <73 K, metal parts <80 K.
• Insulation levels: primary impulse 450 kV peak, secondary 75 kV peak; primary power frequency 95 kV r.m.s, secondary 28 kV r.m.s.
• Bushing details: primary stem 38 x 125 mm, current rating 1250 A, impulse 550 kV peak, creepage 3813 mm; secondary stem 26 x 125 mm, current rating >630 A, impulse 200 kV peak, creepage 1116 mm; neutral similar to primary.
• Overall dimensions: height 5500 mm, length 6400 mm, width 5000 mm.
• Tap-changer: OLTC, Y-neutral end, 300,000 maintenance-free operations, voltage 44 kV, current >93 A.
• Losses: no-load losses at 100% will be used in financial evaluation; load losses averaged over extreme plus, nominal, and extreme minus tap positions.
• Tests: routine tests include lightning impulse, short duration AC with partial discharge, low voltage tests (frequency response, ratio, magnetisation, impedance, winding resistance, bushing tan delta, insulation resistance, CT tests); type tests include temperature rise and acoustic noise; special test is chopped impulse.
• Delivery: transformer delivered to works info, off-loaded and transferred to operating position by supplier, distance 0 m, rise/fall 500 mm, impact recorders on tank.
• Erection: erected ready for service, with 4 layers x 4 mm Malthoid (total 16 mm).
• Operating environment: very heavy pollution, corrosion protection per Eskom spec 240-56030674.
• Oil type per Eskom spec 240-75661431.
• Drawings: 1 set, manuals 5 hard copies + 1 electronic.
• Indicating devices: digital and analogue oil and winding temperature thermometers, pressure relief device per spec, oil and gas actuated relay per spec, dehydrating breathers per spec, oil level indicators per spec, no conservator bag.
• Spares: manufacturer to provide detailed list.
• Bidders must complete Schedule B with guaranteed technical particulars; Schedule A contains purchaser's specific requirements.

No specific financial requirements are stated in the provided content.

No specific compliance requirements are stated in the provided content. Standard National Treasury forms (SBD/MBD) must be completed, including declaration of interest, preference points claim, local production declaration, and certificate of independent bid determination.

The contract is for the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers. Work is on an as-and-when required basis over a five-year period for the Distribution Division. A full scope of work is attached to the tender pack.

Environmental evaluation is pass/fail with two parts. Part A (medium category) scores 0 or 1 per KPI: 0 if the document is not submitted or does not meet minimum requirements, 1 if it does. Part B scores 0 or 1 on the same basis. Required submissions: a signed Annexure B acknowledging Eskom's SHE rules; an Environmental Management Plan covering waste management, environmental induction, incident management and emergency planning; for medium and high risk work, identification of environmental aspects and impacts with methodology and controls; and an environmental (or SHE/SHEQ) policy signed by the company owner, CEO or MD committing to compliance and duty of care. Bidders must also hold a valid ISO 14001 certificate. The overall result is Approved or Not Approved.

The scope covers the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers. Work is on an as-and-when required basis over a five-year period for the Distribution Division. A full scope of work is attached to the tender pack.

Bidders must submit a signed Annexure B acknowledging Eskom's SHE rules and requirements. A valid ISO 14001 Environmental Management Standard certificate is required. The environmental policy must be signed by the company owner, CEO or MD.

The tender covers the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of Class 1 power transformers on an as-and-when required basis over a five-year period for Eskom's distribution division. The specific transformer covered by the technical schedules is a 20 MVA, 44/22 kV YNd1 power transformer.

Returnable documents — the Technical Schedules, Design Parameter Schedules, and General Information Schedule must be completed, signed, and submitted with the bid. Any deviations from the specification must be listed in the Deviation Schedule, with reasons and evidence that the deviation is more cost-effective than the specified requirement.

Bidders must complete and sign the Technical Schedules, Design Parameter Schedules, and General Information Schedule. Any deviations must be listed in the Deviation Schedule with reasons and evidence of cost-effectiveness. Bidders must comply with Eskom specifications referenced in the document (e.g., 240-56030674 for corrosion protection, 240-56063871 for pressure relief device, 240-56063908 for oil- and gas-actuated relay, 240-56062529 for dehydrating breathers, 240-56356191 for oil level indicators). The document does not specify other eligibility criteria such as CSD registration, tax clearance, or B-BBEE requirements.

The tender is for the supply of a 20 MVA, 44/22 kV YNd1 power transformer, Class 1, heavy duty type, with ONAN cooling. The transformer must be delivered to the works, off-loaded, and erected ready for service. The supplier must provide impact recorders on the tank. The transformer must be designed for a very heavy pollution level and an altitude of 1,800 m. Key technical requirements include:

• Rated power: 20 MVA (ONAN), ONAF not applicable.
• Primary voltage: 44 kV r.m.s; secondary voltage: 22 kV r.m.s.
• Tapping range: +5% to -15% of principal ratio, in 1.25% steps, 17 positions.
• Vector group: YNd1; core type; 3 limbs.
• Impedance on principal tapping: 11%; on extreme minus tapping: >10%; tolerances per IEC, with +10%/-0% on extreme minus.
• Temperature rises at 1,800 m: top oil 55 K, windings 60 K, hotspot <73 K, metal parts <80 K.
• Maximum acoustic noise: 71 dB(A).
• Insulation levels: impulse withstand 250 kV peak (primary), 150 kV peak (secondary); power frequency 70 kV r.m.s (primary), 50 kV r.m.s (secondary); induced overvoltage 95 kV r.m.s (primary), 44 kV r.m.s (secondary).
• Bushings: outdoor type; primary stem 38 x 125 mm, current rating 1250 A; secondary stem 26 x 125 mm, current rating 630.58 A; neutral stem 38 x 125 mm, current rating 1250 A; total creepage 1612 mm for all.
• Overall dimensions: height 5500 mm, length 6400 mm, width 5000 mm.
• Safe withstand vacuum: 1.5 kPa.
• Tap-changer: OLTC, 300,000 maintenance-free operations, rated 44 kV, current 370.93 A (both non-vacuum and vacuum types).
• Losses: no plus tolerance allowed; no-load losses at 100% will be used in financial evaluation; load losses averaged over extreme plus, nominal, and extreme minus tap positions.
• Tests: type tests for temperature rise, acoustic noise; routine tests for lightning impulse, capacitances, partial discharge, zero sequence impedance, and various low voltage tests; special test for chopped impulse. Type tests are for first-of-design units only, but Eskom may request them for any unit.
• Drawings and manuals: 1 set of drawings, 5 hard copy + 1 electronic manual.
• Indicating/protective devices: pressure relief device, oil- and gas-actuated relay, dehydrating breathers, oil level indicators, oil and winding temperature thermometers (digital + analogue). No conservator bag required.
• Transformer oil type per Eskom specification 240-75661431.
• Corrosion protection per Eskom specification 240-56030674.
• The Design Parameter Schedule requires bidders to provide detailed design data on core steel, core dimensions, winding design, inter-winding insulation, and other parameters.
• The General Information Schedule requires bidders to provide manufacturer details, oil quantities, masses, zero sequence impedances, transport filling medium, and training details.

The tender covers the design, detailed engineering, manufacture, testing at works, supply, shipping, transportation, delivery, installation, erection, site-testing and commissioning of class 1 power transformers on an as-and-when required basis over a five-year period for Eskom's distribution division. The technical schedules specify a 20MVA, 88/44kV YNd1 power transformer.

Returnable documents — all must be completed, signed and submitted with the bid:

• Technical Schedule (Schedule A and B) for the 20MVA, 88/44kV YNd1 power transformer.
• Deviation Schedule listing any deviations offered, with reasons and evidence that each deviation is more cost-effective than the specified requirement.
• Design Parameter Schedule (Schedule A and B).
• General Information Schedule (Schedule A and B).
• Standard National Treasury forms: SBD 4 (Declaration of Interest), SBD 6.1 (Preference Points Claim), SBD 8 (Past SCM Practices), SBD 9 (Certificate of Independent Bid Determination), and an Authority to Sign.
• Proof of Central Supplier Database (CSD) registration and a valid tax clearance.
• A detailed list of recommended spares.

Disqualification risks:

• Any required schedule or form left incomplete, unsigned or omitted.
• Bids received after the closing time.

Bidders must complete and sign the Technical Schedule, Deviation Schedule, Design Schedule, and General Information Schedule. The tender includes standard National Treasury forms (SBD) which must be completed, including SBD 4 (Declaration of Interest), SBD 6.1 (Preference Points Claim), SBD 8 (Past SCM Practices), SBD 9 (Certificate of Independent Bid Determination), and an Authority to Sign. Bidders must be registered on the Central Supplier Database (CSD) and have a valid tax clearance. Bidders must provide a detailed list of recommended spares.

Transformer type and rating:

• 20MVA, 88/44kV, vector group YNd1, core type, 3 limbs, ONAN cooling.
• Heavy duty type, outdoor main terminals and bushings.
• Continuous rated power: 20 MVA ONAN; ONAF not applicable.
• Rated voltages: primary 88 kV r.m.s, secondary 44 kV r.m.s.
• Tapping range: +5% to -15% of principal ratio, in 1.25% steps, 17 positions including transition positions.
• Resulting no-load voltage with MV constant: 88 kV on principal tapping, 92.4 kV on extreme plus, 74.8 kV on extreme minus.

Losses (no plus tolerance allowed):

• No-load losses to be quoted at 90%, 100% and 110% of rated power; the 100% value is used in financial evaluation.
• Load losses to be quoted at extreme plus, nominal and extreme minus tap positions; evaluation uses the average of the three.
• Losses for cooling fans (power and current) to be quoted.

Impedance and temperature: