Provision of outside plant mv switchgear upgrade at arnot power station – 3-Year contract

Tenderer’s / Supplier’s name: ………………………………………………. Tender Ref number: ………………………………….

Returnable Documents: The tenderer must submit the following OHS tender returnables:

• Annexure B: Signed acknowledgement of Eskom's OHS legal and other requirements.
• Health and Safety Plan: Must address project/scope of work OHS risks and align with health and safety specifications.
• Detailed costing for OHS management: Must be broken down, not a lump sum, based on overall scope and risk assessment.
• Baseline OHS Risk Assessment (BRA): Must include methodology for identifying, assessing, and managing OHS risks.
• Valid Letter of Good Standing (COIDA or equivalent).
• OHS policy signed by CEO, complying with OHS Act Section 7.
• OHS Competency: CVs, qualifications, and certificates as required for the scope.

Mandatory eligibility is contingent on the complete and compliant submission of all listed OHS returnables (items 1-7). Failure to submit any required document, or submission in a non-compliant format (e.g., lump-sum OHS costing), will likely result in disqualification or a 'Not Recommended' evaluation. The tenderer must operate under a valid COIDA registration or equivalent.

Tenderer’s / Supplier’s name: ………………………………………………. Tender Ref number: ………………………………….

Scope of work: ………………………………………………………………………………………………………………………

• For explanatory notes on listed OHS requirements, refer to 240 - 77433139 Annexure A: Supplier Risk Category.

No specific requirements found

Title: Generation Air-Insulated 240-56227573 Unique Identifier: Withdrawable AC Metal- Enclosed Switchgear and Controlgear for Rated N/A Voltages above 1kV up to and including 52kV

Suppliers must demonstrate capability to meet the extensive technical specifications. Eligibility is implicitly based on the ability to provide equipment that is type-tested to the referenced standards (SANS 62271 series, IEC standards, etc.) and the specific requirements of this Eskom Generation standard. Suppliers must submit relevant type test reports during tender to validate equipment ratings against Eskom's system conditions. The equipment and manufacturing processes must comply with referenced quality standards (e.g., ISO 9001, ISO 17025).

This document contains the standard requirements of new air-insulated withdrawable AC metal-enclosed

switchgear and controlgear for rated voltages above 1kV and up to and including 52kV for indoor

installations in accordance with SANS 62271-200.

The basic requirements for design, operations and maintenance shall be defined in this standard as

applicable in the power generation plants belonging to Eskom Generation Group.

The requirements for withdrawable AC metal-enclosed switchgear and controlgear for rated voltages

above 1kV and up to and including 52kV for indoor installations in special environmental conditions such

as nuclear applications are not included in this standard. Those requirements for switchgear for

installation and use in special environmental conditions (i.e. exposure to high temperature, exposure to

high pressure, earthquakes etc.), shall be subject to additional requirements.

This standard excludes requirements for metal-enclosed switchgear used in secondary distribution in the

form of Ring Main Units (RMU). The requirements for RMUs are outlined in the Eskom Distribution

Standard 240-56030406.

This standard includes requirements for 10 to 100MVA generator circuit-breakers and it excludes

requirements for generator circuit-breakers that are rated 100 MVA and above. The requirements for

generator circuit-breakers rated above 100MVA are outlined in the Eskom Generation Standard 24056227522. This standard also excludes generator circuit-breakers intended for use in applications for

pumped storage installations.

2. Supporting clauses

2.1 Scope

2.1.1 Purpose

The standard describes requirements for new air-insulated withdrawable AC metal-enclosed switchgear

and controlgear for rated voltages above 1kV and up to and including 52kV for indoor installation.

In order to ensure standardisation, the withdrawable AC metal-enclosed switchgear and controlgear

covered by this standard shall be type tested, of modular design with air-insulated busbars for use on

three phase systems at a rated frequency of 50Hz.

The standard also describes requirements for generator circuit-breakers for generators rated 10 MVA to

100MVA. These generator circuit-breakers are traditionally housed in an AC metal-enclosed switchgear

and controlgear.

Components contained within the withdrawable metal-enclosed switchgear and controlgear functional

unit shall be designed, manufactured and tested in accordance with their respective relevant standards.

The manufacturer shall design and supply the necessary connections, interconnecting wiring, supporting

steelwork, holding-down bolts, guards, labels, other interfaces to structural foundations, accepted

documentation, accessories etc. required to make a complete functional assembly that comply with this

standard.

2.1.2 Applicability

This document shall apply to the Eskom Generation Group.

Controlled disclosure

When downloaded from the EDMS, this document is uncontrolled and the responsibility rests with the user to ensure it is in line

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

2.2 Normative/informative references

Parties using this document shall apply the most recent edition of the documents listed in the following

paragraphs.

2.2.1 Normative

The following documents (all parts including any amendments) contain provisions for this standard. For

referenced standards, the latest revision of the document shall apply.

[1] 240-114967625 Operating Regulations for High-Voltage Systems.

[2] 240-75655504 Corrosion protection standard for new indoor and outdoor Eskom equipment,

components, materials and structures manufactured from steel Standard.

[3] 240-143485806 Generation Auxiliary Plant MV Protection Standard.

[4] 240-56357424 MV and LV Switchgear Protection Standard.

[5] 240-56227589 List of Approved Electronic Devices to be used on Eskom Power Stations.

[6] 240-64685228 Generic Specific for Protection Intelligent Electronic Devices (IEDs)

[7] 240-150642762 Generation Plant Safety Regulations.

[8] 240-71432150 Plant Labelling Standard.

[9] 240-86973501 Engineering Drawing Standard - common requirements

[10] 240-56065202 Switchgear training requirements from original equipment manufacturers standard.

[11] TBA Engineering Drawing Symbol Standard.

[12] 0.00-002839 MV and LV Switchgear Outdoor Isolator Padlock.

[13] 0.00-10341-01 MV and LV Switchgear Lugs and Terminals.

[14] 0.00-10341-02 MV and LV Switchgear Pre-Insulated Lugs and Sleeves.

[15] 0.00-10341-03 MV and LV Switchgear Wiring and Termination.

[16] 0.00-10341-04 MV and LV Switchgear Circuit Function Letters.

[17] 0.00-10343-01 MV, LV and DC Switchgear Labels and Nameplate Details English Designation

Only Arrangement Diagram.

[18] 0.00-10343-02 General Labels & Nameplate Details Arrangement Diagram.

[19] OHS Act Occupational Health and Safety Act (Act ) and Regulations.

[20] SANS 1091 National Colour Standards.

[21] SANS 1574 Electric Cables- Flexible Cords and Flexible Cables.

[22] SANS 10142-2 The Wiring of Premises Part 2: MV Installations above 1kV a.c. not exceeding

22kV a.c. and upto and including 3 MVA installed capacity.

[23] SANS 876 Cable terminations and live conductors within air-filled enclosures (insulation co-

ordination) for rated a.c. voltages from 7.2 kV up to and including 36 kV.

[24] SANS 60529 Degrees of Protection Provided by Enclosures (IP Code)

[25] SANS 61000 Electromagnetic Compatibility (all relevant parts).

Controlled disclosure

When downloaded from the EDMS, this document is uncontrolled and the responsibility rests with the user to ensure it is in line

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

[26] SANS 61243-5 Live working – Voltage Detectors – Part 5: Voltage Detecting Systems (VDS).

[27] SANS 62271-1 High-Voltage Switchgear and Controlgear – Part 1: Common Standards.

[28] SANS 62271-100 High-Voltage Switchgear and Controlgear – Part 100: High-Voltage

Alternating-Current Circuit-Breakers.

[28] SANS 62271–102 High-Voltage Switchgear and Controlgear – Part 102: Alternating Current

Disconnectors and Earthing Switches.

[29] SANS 62271–200 High-Voltage Switchgear and Controlgear – Part 200: AC Metal-Enclosed

Switchgear and Controlgear for Rated Voltages above 1 kV and up to and

including 52 kV.

[30] SANS 62271-307 High-Voltage Switchgear and Controlgear – Part 200: Guidance for the

extension of validity of type tests of AC metal and Solid Insulation Enclosed

Switchgear and Controlgear for rated voltages above 1kV and up to and including

52kV.

[31] SANS 61869-1 Instrument transformers Part 1: General requirements.

[32] SANS 61869-2 Instrument transformers Part 2: Additional requirements for current transformers.

[33] SANS 61869-3 Instrument transformers Part 3: Additional requirements for inductive voltage

transformers.

[34] SANS 1019 Standard Voltages, Currents and Insulation Levels for Electricity Supply.

[35] SANS 61508 Functional Safety of Electrical/electronic/programmable Electronic Safety-related

Systems. All Parts

[36] SANS 61511 Functional Safety - Safety Instrumented Systems for the Process Industry Sector.

All Parts.

[37] SANS 1195 Busbars.

[38] SANS 1411-1 Materials of Insulated Electric Cables and Flexible Cords: Part 1: Conductors.

[39] SANS 61213 Mechanical Cable Glands.

[40] SANS 60060 High-Voltage Test Techniques.

[41] SANS 60269 Low-Voltage Fuses.

[42] SANS 60947 Low Voltage Switchgear and Controlgear. All parts

[43] SANS 61238-1 Compression and Mechanical Connections for Power Cables for Rated Voltages

up to 30 kV(Um=36kV) Part 1: Test methods and requirements.

[44] IEC 60051 Direct-Acting Analogue Electrical Measuring Instruments and their Accessories.

[45] IEC 60688 Electrical Measuring Transducers for Converting AC and DC Electrical Quantities

to Analogue or Digital Signals.

[46] IEC/IEEE 62271-37-013 High-Voltage Switchgear and Controlgear – Part 37-013: Alternative –

current generator circuit-breakers.

[47] IEEE Std C37.013a Standard for AC High Voltage Generator Circuit-breakers Rated on a

Symmetrical Current Basis – Amendment 1: Supplement for Use with Generator

Rated 10-100 MVA.

[48] ISO 17025 General Requirements for the Competence of Testing and Calibration Laboratories

Controlled disclosure

When downloaded from the EDMS, this document is uncontrolled and the responsibility rests with the user to ensure it is in line

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

[49] ISO 9001 Quality Management Systems.

[50] CDA Publication 22 Copper Development Association (CDA), Publication 22, Copper for

busbars.

[51] IEC 60038 Standard Voltages.

[52] IEC 60518 Dimensional standardisation of terminals for high-voltage switchgear and

controlgear.

[53] EPRI 10003471 Electrical Connector Guideline.

2.2.2 Informative

Not applicable.

2.3 Definitions

The definitions contained in SANS 62271 shall apply. The following are the definitions of specific

uncommon terms used in the document

Definition Description

Abnormal Power Supply Conditions whereby switchgear is operated within the design and

System Conditions testing requirements but outside the normal system voltage and

frequency but within the fault current specified.

Behind-Closed-Door This refer to the design of switchgear where the circuit-breaker

Operation compartment is such that the circuit-breaker is withdrawable and can

be moved from the service position to the disconnected or test

position and vice versa with the front door of the circuit-breaker

compartment closed and locked.

Busbar Extension Dummy A panel which is only contain the busbar functional compartment, and

Panel is designed and installed between two adjacent panels to provide

spacing for cable termination alignment. (See definition of Panel

below)

Earth bar Metallic bar forming part of the switchboard and used as a conductor

for grounding and or earth path circuits as may be connected with it.

Electrical Life of Components The electrical and mechanical designed operational life of equipment

and components, in terms of the number of electrical operations,

mechanical operations, age, etc.

Exhaust Duct Mechanism used to evacuate gasses generated during an internal arc

to the outside of the room. This shall be installed at the top of the

switchboard and it shall be connected to the explosion vent and shall

have a type tested sealed lid.

Explosion vent Mechanism used to discharge gasses from functional unit enclosure

into an exhaust duct to relieve the pressure generated during an

internal arc. This shall normally be installed at the top of the enclosure

and shall form part of the functional unit.

Controlled disclosure

When downloaded from the EDMS, this document is uncontrolled and the responsibility rests with the user to ensure it is in line

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

Definition Description

IAC AFLR Internal arc classification for type A (operator safety) accessibility for

the front side, lateral side and rear side of the panel

Joggle Chamber Custom designed metal enclosed panel used to align the busbars of

different types of metal-enclosed switchgear

Mechanical Life The life expectancy of the component which shall be determined by

the mechanical operations of the component. The mechanical

operational life expectancy shall be determined irrespective of the

electrical operational load.

Panel General term referring to a functional unit of metal-enclosed

switchgear in accordance with SANS 62271-200.

Specialised tools Any purpose-built tools that are necessary to carry out major (or

specialised) maintenance on a circuit-breaker and its components

Switchboard A complete switchgear assembly consisting of number of switchgear

panels (switchgear panels include incomer panels, feeder panels,

bus-section panels where cables are used to connect two bus-section

breakers, VT panels, etc.).

2.3.1 Disclosure Classification

Controlled disclosure: controlled disclosure to external parties (either enforced by law, or

discretionary).

2.4 Abbreviations

AC Alternating Current

AFLR A-(operator safety), Front, Lateral, Rear

CoE Centre of Excellence

CSMES SC Cable Systems and Metal Enclosed Switchgear Study Committee

CT Current Transformer

DC Direct Current

EPRI Electric Power Research Institute

HMI Human Machine Interface

HRC High Rupturing Current/Capacity

IAC Internal Arc Classified

IEC International Electrotechnical Commission

IEEE Institute of Electrical and Electronics Engineers

IP International Protection code

ISO International Organization for Standardization

Controlled disclosure

When downloaded from the EDMS, this document is uncontrolled and the responsibility rests with the user to ensure it is in line

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

LSC Loss of Service Continuity

LV Low Voltage

MCB Miniature Circuit-Breaker

MES CG Metal Enclosed Switchgear Care Group

MV Medium Voltage

NPS Negative Phase Sequence

ORHVS Operating Regulations of High Voltage Systems

PILC Paper Insulated Lead Covered

PM Partitions Metallic

PPS Positive Phase Sequence

RMU Ring Main Unit

SANS South African National Standards

VDS Voltage Detection System

VT Voltage Transformer

XLPE Cross-linked Polyethylene

2.5 Roles and responsibilities

 Generation Asset Management is the custodian of the standard.

 Generation power stations should ensure that acquisition of all new MV switchgear is done

in accordance to the provisions of this document.

 This document shall be used in conjunction with the technical specification.

2.6 Process for monitoring

None

2.7 Related/supporting documents

[54] 240-93576770 Technical A&B Schedule Template

[55] 240-93576642 Compliance Schedule Template

[56] 240-77300784 MV Switchgear Schedules Template

Controlled disclosure

When downloaded from the EDMS, this document is uncontrolled and the responsibility rests with the user to ensure it is in line

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

3. Standard of air-insulated withdrawable medium voltage metal-

Enclosed switchgear and controlgear

3.1 Ratings and operating conditions

3.1.1 Panel Ratings

a) The ratings selected for the switchgear and controlgear, their operating devices and the auxiliary

equipment shall be in accordance with SANS 62271-200, and shall be provided in each project

specific Switchgear Schedules (240-77300784) and Technical Schedule A&B (240-93576770).

b) The associated temperature rise for the rated normal current specified in each Technical Schedule

A&B and Switchgear Schedule shall be in accordance with SANS 62271-200. The panel types shall

be fully type tested at the specified current ratings.

c) For motor starters, the temperature rise current ratings shall take into account the impact of the

motor starting current and the number of starts per hour specified.

3.1.2 Ratings for Switching Devices

a) The circuit-breaker shall be capable of continuously carrying the circuit-breaker current rating as

specified and at the specified altitude for an ambient temperature of 40oC.

b) All assigned current ratings relate to the circuit-breaker in the in-service position within the fully

assembled and functional unit.

c) The circuit-breaker shall be capable of interrupting, making, latching against and able to withstand

the specified fault duties at the maximum specified voltage.

d) The electrical endurance for the circuit-breaker shall be classified as Class E2 in accordance with

SANS 62271-100 without reclosing, unless otherwise specified for special applications.

e) The mechanical endurance for the circuit-breaker shall be classified as Class M2 in accordance with

SANS 62271-100.

f) The electrical endurance for Earthing devices shall be Class E2 in accordance with SANS 62271-

102, as a minimum.

g) The mechanical endurance for Earthing devices shall be Class M1 in accordance with SANS 62271-

h) The short-circuit withstand current rating and insulation level of an earthing device shall match that

of the panel. This excludes the special installations such as small generating plant (less than

100MVA) where power evacuation system consists of metal enclosed switchgear.

i) The connection between the earthing device and the panel earth bar shall be designed to withstand

the panel short-circuit withstand rating for same duration.

3.1.3 System Characteristics and Operating Conditions

The following system characteristics and operating conditions may be experienced on Eskom

Generation Plants where medium voltage withdrawable metal enclosed switchgear and controlgear will

be installed. It is therefore required that during tender submissions, suppliers need to indicate and submit

where applicable, the relevant SANS/IEC type test reports that can be used to validate equipment

ratings against these system characteristics and operating conditions.

a) Main power system normal power supply conditions may occur simultaneously as follows:

 Voltage: ± 5%

Controlled disclosure

When downloaded from the EDMS, this document is uncontrolled and the responsibility rests with the user to ensure it is in line

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

 Negative Phase Sequence (NPS) voltage up to 0.02 of nominal Positive Phase Sequence (PPS)

voltage

 The Zero Phase Sequence Voltage component can be up to 1% of the PPS component.

b) Circuit-breaker auxiliary coils shall be functional under the following conditions for both AC and DC

applications:

 Shunt closing release – between 85% and 110% of the rated supply voltage.

 Shunt opening release – between 85% and 110% of the rated supply voltage.

 Under-voltage release - below 35% of the rated supply voltage.

c) The harmonic distortion of the supply voltage under normal operation shall be as follows:

 The Total Harmonic Distortion (THD) of the voltage can be up to 5% of the fundamental

component.

 The voltage waveform can contain harmonic components up to the 100th harmonic.

 The amplitude of any individual component can be up to 1% of the fundamental component.

d) The amplitude and duration of temporary abnormal voltage operating characteristics which can

occur on the power supply shall be as follows:

 Short Duration Abnormal Conditions: Short duration under voltage conditions arise either due to

a loss of supply or the supply voltage being depressed due to a short circuit on the network.

 Loss of Power Supply:

i. When the supply is disconnected, the supply voltage either drops rapidly to 0% of

nominal value or it is sustained at low amplitude at a reduced frequency because of back

generation of electrical drives.

ii. The initial voltage amplitude during these conditions is less than 80% of nominal value

and decays with a time constant of up to 1.5 seconds.

iii. The time duration from loss of supply until supply restoration is between 1 second and

2.5 seconds.

3.1.4 Switchgear Operating Conditions

a) The switchgear shall comply with the power station operating conditions and with the operating

requirements of 240-114967625: Operating Regulations for High-voltage Systems.

b) Under normal and abnormal conditions, in the events the following may occur during which all the

safety requirements of the switchgear and controlgear shall be met;

 A fault can occur when moving a withdrawable component (e.g. a circuit-breaker) from the

disconnected, earthed or test position to the service position and vice versa

 An earth switch can be applied onto a live power circuit

 A low voltage compartment investigation can be performed while the functional unit is live

 VTs’ can be racked in/out with the switchboard energised

 A cable can be terminated in an isolated cable compartment whilst the busbars of the isolated

compartment panel and adjacent cable compartments are live

 Busbar VT panel can be racked out and accessed whilst the busbars and adjacent circuit-breaker

compartments are alive.

Controlled disclosure

When downloaded from the EDMS, this document is uncontrolled and the responsibility rests with the user to ensure it is in line

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

3.2 Panel design and construction

3.2.1 Service Conditions

The normal service conditions for indoor switchgear and controlgear specified in SANS 62271-1 shall

apply. The following additional specific requirements shall be taken into account:

a) A minimum ambient air temperature of -5 0C;

Note: A maximum ambient air temperature of 40 0C is applicable, in accordance with the ‘normal’

service conditions for indoor switchgear as specified in SANS 62271-1.

b) The switchgear shall be installed up to altitudes of 1800 m;

Note: Due (in part) to the fact that the switchgear and controlgear shall be used up to altitudes of 1800

m AMSL (Above Mean Sea Level), higher insulation withstand levels shall be specified in project

specific Switchgear Schedules (240-77300784). No further altitude correction factors are

therefore required for altitudes above 1000 m AMSL in accordance with SANS 62271-1.

3.2.2 General Requirements

a) The switchgear and controlgear shall be of indoor use, air-insulated, metal-enclosed and internal arc

classified in accordance with SANS 62271-200.

b) The switchgear and controlgear shall be internal arc classified AFLR for 1 second in accordance

with SANS 62271-200.

c) The switchgear and controlgear shall be of behind-closed-door operation i.e circuit-breaker

compartment door shall not be part of the circuit-breaker.

d) The switchboards shall be of modular designs that allow for the subsequent addition of identical

panels.

e) The switchgear and controlgear shall be clearly marked with the ratings to which the equipment has

been type tested. This rating shall be in the nameplate.

f) Design information relating to the type tested and routine tested components and moulded

components (i.e. spouts, bushings, insulators) shall be made available i.e. during tendering to clarify

the materials, manufacturing method, design and manufacturing location for these components.

3.2.3 Panel Architecture

Single busbar design is required for withdrawable indoor metal enclosed switchgear and shall include the

following defined panels (functional units):

a) “Incomer” panels incorporating a withdrawable three-pole operated circuit-breaker, cable earthing

switch and cable compartment fitted with CTs, VTs and VDS;

b) “feeder” panels incorporating a withdrawable three-pole operated circuit-breaker, cable earthing

switch and cable compartment fitted with CTs and VDS;

c) “bus-section” and “interconnector) panels incorporating a withdrawable three-pole operated circuit-

breaker, CTs, VTs and VDS on both busbar sections; and

d) “VT” panels incorporating a withdrawable VT and busbar earthing switch.

Note: Switchgear schedule (240-77300784) shall indicate the required panels for a specific project.

Controlled disclosure

When downloaded from the EDMS, this document is uncontrolled and the responsibility rests with the user to ensure it is in line

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

3.2.4 Segregation of Compartments

3.2.4.1 General

As a minimum, separate compartments shall be provided for the different panels forming a switchboard

as follows:

 Circuit-breaker compartment

 Main busbar compartment

 Low voltage compartment

 Power cable compartment

 Busbar earthing device compartment

 VT compartment

3.2.4.2 Low Voltage Compartment

a) The low voltage compartment shall be located at the front and top position of the functional unit.

b) The compartment shall be designed to house all equipment required for the protection, control and

monitoring functionalities specified.

c) The Human Machine Interface (HMI) shall be located on the compartment door and all control

facilities shall be accessible from the front of the panel.

d) The compartment door shall be of swing frame design.

e) The low voltage compartment design shall allow for control cables to be added either from the top or

the bottom.

f) Slots or holes used to channel control cables into the low voltage compartment shall be sealed off to

prevent debris from adjacent compartments during an arc flash incident.

3.2.4.3 Power Cable Compartment

a) The power cable terminations and current transformers shall be accessible from the power cable

compartment.

b) The panel shall be designed such that it allows for disconnection of power cables, removal and

replacement of current transformers with the main busbars energised. In other words, the panel

shall be designed such that arc flash occurring in one compartment does not propagate to other

compartments.

c) The power cable compartment shall comply with the SANS 876 and shall provide for both single

core or three core cables type 2 (shrouded) terminations, unless otherwise specified.

d) Special procedures shall be required to access the power cable compartment in accordance with

ORHVS in 240-114967625.

3.2.4.4 Main Busbar Compartment

a) The main busbar compartment shall house the busbars and the busbar support structures.

Controlled disclosure

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

b) Special procedures shall be required to access the main busbar compartment in accordance with

ORHVS in 240-114967625.

3.2.4.5 Circuit-breaker Compartment

a) A dedicated compartment shall be provided to house the circuit-breaker.

b) The compartment of the withdrawable device shall be an operator-accessible compartment as per

interlocking requirements.

c) The switchgear panels design shall be the mid-mount/ floor-mount withdrawable type, that shall

ensure to provide:

1. Integral Motorised Racking of the circuit-breakers on panel mounted rails/ guided panel floor

plates within the switchgear panel, and

2. Withdrawing or inserting of the withdrawable mounted circuit-breakers in and out of the

switchgear panels shall be achieved by ensuring the correct floor level alignment for trolleys or

circuit-breaker floor level wheel movement during the switch room design. This floor level alignment

requires the switchgear room floor design to consider where applicable:

• cable trench mounted base frame alignment to the onsite casted switchgear room floor level,

• concrete floor levels where switchgear panels are mounted directly on top of the floor, and

• steel base raised floor levels.

3. Positive circuit-breaker position indication and catch-like mechanisms shall be provided to

confirm the status and physical correct position of the cassette mounted circuit-breaker on the panel

mounted rails inside the switchgear panels for; the ready to withdrawal position, the inserted and

ready to rack in position and the in-service position.

d) A hole shall be provided on the circuit-breaker door aligning with the OFF pushbutton of the circuit-

breaker. This is to allow circuit-breaker to be tripped directly during an emergency. The special tool

shall be provided to trip the circuit-breaker or an attached mechanism on the door shall be provided

for the tripping function of the circuit-breaker.

e) The ON pushbutton of the circuit-breaker shall be blanked off to prevent the circuit-breaker from

being closed directly. The circuit-breaker shall be closed via the IED at bay level or via the

Scada/dcs.

3.2.4.6 Busbar Earthing Device Compartment

a) The busbar earthing device compartment shall be a special-accessible compartment and requires

that the switchboard and all incoming and outgoing supplies to be isolated and tools shall be

required to open this compartment. The isolations shall comply with requirements of ORHVS in 240-

114967625 and Generation Plant Safety Regulations 240-150642762.

b) The busbar earthing device compartment shall be on the same panel as the VT compartment.

c) The busbar earthing device shall be operated from the front and the outside of the panel.

d) The busbar earthing device shall be of the fixed type. The use of a withdrawable device shall be

subject to Eskom acceptance.

Controlled disclosure

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

3.2.4.7 VT Compartment

a) The compartment of the VT device shall be a separate panel with an operator-accessible

compartment as per interlocking requirements to prevent access to the VT while racked in.

b) The VT shall be of the withdrawable type.

3.2.5 Service Continuity Classification

The loss of service continuity category shall be LSC2B in accordance with SANS 62271-200.

3.2.6 Partition Class and Shutters

a) Partition class PM classification as defined in SANS 62271-200 shall be required for shutters to the

breaker compartment when breaker is withdrawn to the disconnected, test, earthed or removed

position.

b) Automatically-operated shutters shall be provided so that on racking out of the circuit-breaker, these

shutters cover the busbar and cable connection points inside the spouts automatically to prevent

inadvertent contact with live busbars and cables.

c) Orifice shutter operation shall be positively driven in both directions. Solely gravity operated shutters

shall not be accepted.

d) Orifice shutters shall be automatically operated by the movement of the withdrawable part.

e) Spout shutters shall be arranged to operate independently for the busbar spout shutters and cable

connection spout shutters. These shutters shall be capable of being padlocked in the open and

closed position. Shutters shall operate without lubrication and shall be constructed in such a

manner as to ensure fail-safe operation.

f) Shutter endurance and reliability shall be proven by type testing to the number of operations as

specified.

g) Busbar spout shutters shall be coloured red and labelled with the word “BUSBAR” in black letters at

least 50 mm high.

h) Cable spout shutters shall be coloured yellow and labelled with the word “CABLE” in black letters at

least 50 mm high.

i) In case of bus-section circuit-breakers of switchboards joined by busbars both shutters shall be

labelled “BUSBAR”.

3.2.7 Cooling

a) The use of natural cooling on functional units is preferred over forced cooling.

b) Where forced cooling forms part of the standard design and type testing, the design shall be in

compliance with the following requirements:

c) No tripping of the circuit-breaker shall be allowed if the fan fails.

d) Monitoring of the fans shall be done using fan failure indications and alarms.

e) The cooling fan motor assembly shall be readily available in South Africa.

f) Low speed high volume fans shall be used.

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

3.2.8 Degree of Protection

a) The required minimum degree of protection shall be in accordance with SANS 60529:

1. IPXXB for live parts (inside LV compartment), and

2. IP3X for cable boxes.

b) The degrees of protection of the switchboard offered shall be IP4X.

3.2.9 Panel Fasteners, Doors and Covers

a) Fasteners used in the construction of the functional unit shall not deviate from those used in the type

tested panels.

b) If the panel fastener is also the locking mechanism, provision shall be made for a padlock with

dimensions as specified in Figure 1.

c) Where the design allows for lift-off covers for the cable compartment, the cover shall be

mechanically interlocked with the cable earthing device. The cover shall only be removed if the

cable earth switch is applied.

d) All compartment doors housing a circuit-breaker or Busbar VT shall be fitted with a front window, for

the purpose of indicating the mechanical status of the component within, that was part of the type

testing for internal arc compliance.

e) Cable compartments shall be fitted with a bolted cover or doors. Interlocks are mandatory when

accessing the cable VT.

f) Cable compartment doors shall be tool-based accessible and lockable.

g) Where doors are provided for empty compartments, the doors shall be pad-lockable with a padlock

as shown in Figure 1.

Figure 1: Eskom standard padlock.

3.2.9.1 Padlocking facilities

a) Facilities shall be provided to padlock the following:

1. all orifice shutters individually in the closed position;

2. the circuit-breaker in each of the service and test/disconnected positions;

3. the integral earthing switches in both the open and earthing positions; and

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

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4. the circuit-breaker where applicable when it is supplied with the mechanical closing device

button.

b) All padlock facility positions shall be labelled.

c) All padlocking facilities shall be suitable for padlocks that have a shackle diameter of 8 mm, as

shown in Figure 1.

3.2.10 Corrosion Protection

a) Steelwork shall be corrosion protected in accordance with the standard 240-75655504. Where

corrosion protection is not in accordance with the Eskom standard, the tenderer shall provide proof

that the method of corrosion protection applied is equal or better than the stipulated requirements in

240-75655504.

b) The colour of the final coating shall be in accordance with SANS 1091.

3.2.11 Labels and Colour Coding

3.2.11.1 General

a) All local paint colours shall be standard colours in accordance with SANS 1091. Imported colours

(RAL) shall match local colours.

b) All labels shall be in accordance with labelling standards found in 240-71432150 and 0.00-10343

Sheets 1 and 2.

c) Labels shall be inscribed in English. The content of the label shall be provided by Eskom following

the relevant plant codification standard.

3.2.11.2 Colour Coding of Switchboards

All switchgear panels need to be painted as per the system voltage categories in Table 1 below. For

voltage categories not covered in Table 1, special instructions will be provided for each project by

Eskom. The painting of panels shall include all front covers, side covers and back covers.

Table 1: Colour Coding of Switchboards.

Voltage (kV) Colour

15 Local H09

Imported RAL 6028

11 Local H09

Imported RAL 6028

6.6 Local B32

Imported RAL 2000

3.3 Local B32

Imported RAL 2000

3.2.11.3 Warning Labels for Internal Arc Classified Board

a) In cases where the design of the functional unit is such that the blow out is to the top of the

functional units in order as to fulfil the IAC requirements, the switchboard shall be labelled to provide

warning messages to people working on the panels.

b) The following is the prescription for the warning labels required:

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

c) DO NOT CLIMB ON TOP OF THE SWITCHGEAR WHEN ENERGISED. The labels shall be

installed at the rear and the sides of the switchboard. The number of labels on the rear shall depend

on the length of the board.

d) DO NOT STEP ON THE PRESSURE RELIEF FLAPS. The labels shall be installed at locations

clearly visible and in close vicinity to the flaps.

e) The warning labels shall be of red lettering on a white background.

3.2.12 Busbars and Connections

a) The main busbars compartment and connections inside the busbar compartment shall be air

insulated and the clearances shall not compromise the specified voltage withstand levels. The

busbars shall be supplied as per the type tested arrangement, including any additional insulation

shrouding or tubes that were used.

b) Cables are not allowed to be used for busbars or busbar connections inside the circuit-breaker,

busbar voltage transformer and busbar compartments.

c) All busbars shall be marked per panel in such a manner that they shall be easily identifiable as to

the phase or pole they are connected to when covers are removed. It is recommended to use heat

shrink tube for marking however, the material used for marking the busbars is subject to Eskom

acceptance.

d) Busbar connections shall be made with at least two bolts and the overlap is sufficient to ensure

ample mechanical strength and joint conductivity. The busbar connections shall match those of a

type tested panel. Silver tinted or tinted copper joint interfaces are preferred.

3.2.13 Spouts, Bushings and Insulators

a) Moulded type bushings and spouts shall be used as the connection between circuit-breakers and

busbars.

b) All bushings and insulators shall have permissible levels of partial discharge in accordance with

SANS 62271-200.

3.2.14 Insulating Materials

a) The insulation material shall be identical to the material used during voltage withstand and

temperature rise type testing.

b) Insulating materials may be used in areas where the insulation level criteria cannot be met with air

as an insulating medium.

c) Where insulation on busbars is required, it shall be of the heat shrink type with non-static

characteristics.

d) Where insulating barriers are required, the material used shall be of a non-static type.

3.2.15 Auxiliary Circuit Wiring and Identification

a) The wiring, terminals, lugs, identification and installation shall be in accordance with Drawing

0.00/10341.

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

b) All control wiring shall be of a neat appearance and suitably braced, placed in wire trunks, clipped

and/or laced to prevent vibration and not to be deformed under through fault conditions.

Connections to equipment on swing doors shall be arranged so as to give a twisting motion and not

a bending motion to the conductor.

c) For identification all leads shall be marked at both ends with an approved type of marking device in

accordance with the schematic diagram. Interlocking type ferrules with permanent black letters

impressed on a white or yellow background are preferred. The number ferrule shall not fall off when

disconnecting the wire. Ferrules shall read in a consistent manner in both vertical and horizontal

planes (see Drawing 0.00/10341 Sheets 3 and 4).

d) Control wire sheaths shall be coloured as follows:

1. AC circuits: Black

2. DC circuits: Grey

3. Earthing: Green and yellow

4. CT and VT wiring shall be coloured as per the phase - red, white, blue and black (neutral).

 CT wiring: Wiring between the current transformer and the low voltage compartment

terminals shall be coloured as per the phases – red, white, blue and black (neutral) with

wire numbers in accordance in Drawing 0.00/10341 Sheets 4.

 VT wiring: Wiring between the voltage transformer and the first fuse shall be coloured as per

the phases. After the first fuse the AC wiring shall be all black with wire numbers in

accordance in Drawing 0.00/10341 Sheets 4.

e) Control wiring shall be terminated with pre-insulated compression type lugs. Each terminal strip

mounting rail shall be provided with not less than 10% spare length with a minimum of 50 mm. Not

more than two conductors shall be connected to any side of a terminal, so that the size of all

terminals is suitable for the termination of two cables/wires of 4 mm2 each.

f) For top cable entry into the low voltage compartment, gland plates for control cables shall be

provided . An arrangement of terminals in the low voltage compartment allow for easy termination of

all cables brought in. The number of control terminals shall be in accordance with the control

drawings for that specific panel. Allowance shall be made for any possible inter-panel or looped bus

wiring, from one low voltage compartment to the next low voltage compartment.

g) All external control cables shall be brought into the low voltage compartment, within a separate

channel from the power cable compartment.

3.2.16 Power Cable Entry and Termination

3.2.16.1 Power Cable Termination

a) The power cable compartment shall be adequately sized to allow for the termination in air.

Allowance shall be made inside the cable compartment to install the termination kits for either PILC

or XLPE MV cables of the same voltage rating as the panel, unless otherwise specified.

b) The distance between cable termination points and adjacent structures within the compartment shall

be in accordance with SANS 876.

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

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c) Provision shall be made to allow for the termination of multiple cables per phase. It is required to

always provide one termination flag per cable to be terminated. The number of cables shall be

provided in the MV Switchgear Schedule 240-77300784.

3.2.16.2 Gland Plates

a) Gland plates shall be of pre-galvanised or aluminium sheets and the switchgear manufacturer shall

provide a means to ensure good metallic contact between the gland plate and the body of the panel.

The number of cables shall be provided in the MV Switchgear Schedule 240-77300784

b) There shall be an earth path continuity for the armouring through gland, gland plate to panel and

earth bar.

c) For single-core cables, a non-ferrous or split-stainless steel gland plate shall be used to eliminate

eddy currents.

3.2.16.3 Cable Entry Arrangements

The minimum requirements shall be as per the SANS 876: Distance from terminal centre line to gland

plate or cable clamp. Any through wall plates or gland plates mounted between the bushing centre line

and cable clamps shall be a minimum distance of 800 mm from the bushing centre line to the through

wall plate or gland plate to allow for standard Eskom three core cable terminations, unless otherwise

specified. For single-core cables the minimum distance shall be 600mm from terminal centre line to

gland plate or cable clamp.

3.2.16.4 Vermin and Fire Proofing of Cable Compartment and LV Compartment

a) All cable compartments shall be designed to be sealed off with a 2 hour fire retardant material of at

least 50 mm thick at floor level, after the cables have been installed, to ensure that fire cannot

propagate from the basement/trench into the switchgear cable compartment.

b) For top entry of control cables into the LV compartment, all unused gland holes shall be sealed.

c) The space provided beneath the switchgear panel in the trench shall allow for the installation of fire

retardant material, to the extent that during an internal arc in the cable compartment there shall be

no pressure release or any smoke or heat to the front of the panel, the rear of the panel, into the

cable trench or tunnel or any adjacent compartments and functional units.

3.2.17 Earthing

a) Holes shall be provided for connecting the station earth to the switchboard earthing bar inside the

switchgear panels. The earthing bar shall not extend outside the last panel.

b) Provision shall be made for the earthing bar to be connected to the station earth mat at least at both

ends of the board and for boards exceeding 15 m in length shall be connected to the station earth in

at least three places.

c) For any earth bar, it is required to provide 25 mm wide earth bar with a suitable thickness calculated

to provide an equivalent fault current carrying capacity of at least 200 A/mm2. The impact of holes in

the earth bars shall also be considered to ensure the fault current rating equivalent cross section

required.

d) All doors and covers shall be earthed to ensure that the touch potential does not exceed the safe

values as specified in the OHS Act.

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

3.2.18 Busbar Extension Dummy Panels

a) The busbar extension dummy panel shall be designed and constructed to ensure compliance to the

type tested switchgear panel design and arrangement.

b) Where Busbar extension dummy panels are installed the main busbars shall not be accessible.

3.3 Special consideration for internal arc proof design

a) Pressure relief flaps in a power compartment shall be designed such that the gasses are not

directed to any other compartment during an internal arc fault.

b) Each power compartment shall have dedicated exhaust channel inside the panel to the pressure

relief flaps.

c) Each compartment shall contain the arc without spreading it to other compartments.

d) Each functional unit (panel) shall contain the arc without spreading it to any other functional unit/s.

e) Due to the internal arc classification and for maintenance purposes, no VTs or earthing device shall

be installed within the pressure relief area on top of any functional unit.

f) On fault levels equal and above 25kA, all switchboards shall be equipped and type tested with

exhausting ducts to channel the hot gasses generated by internal arc fault to the outside of the

substation. All applicable type test reports and type test videos shall be provided during tender

evaluations.

g) On fault levels below 25kA, the design of switchboard may allow for venting to the inside of the

substation switchgear room subject to Eskom’s acceptance. In such a case, proof of type test

reports and type test videos shall be submitted for Eskom tender evaluations. During design phase

simulation reports, by calculation or other means, shall be submitted to declare that it is safe to vent

inside the substation(s).

h) Switchboard fitted with the exhaust duct shall not have common duct with the next switchboard. (i.e.

Switchboard A shall not have common ducts with Switchboard B even if they are connected by

bisection circuit-breakers.

i) For substations with soft ceilings and/or windows (glass), venting shall be directed to the outside of

the substation via the exhausting duct.

j) IAC requirements shall be upheld while working in the low voltage compartment. Hence, the

channels or conduits between the power compartments and the low voltage compartments should

be sealed accordingly and type tested with the LV compartment door removed.

3.4 Circuit-breakers

3.4.1 General

a) Circuit-breakers shall be in accordance with SANS 62271–100

b) Circuit-breakers are of the triple-pole withdrawal type with visible indication which is mechanically

interlocked with the circuit-breaker.

c) The arc-quenching medium and/or insulation are of the type tested as specified.

d) Withdrawable circuit-breakers are housed in a circuit-breaker compartment of the “behind close

door” design.

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

e) The circuit-breaker operation under emergency operating conditions shall comply with the “behind

close door” design.

f) Total current interruption (break) time as defined in SANS 62271-100 shall not be greater than the

time duration specified, under all operating conditions.

g) Where circuit-breakers are used, the power connecting arms are fully insulated. Bare copper as

connecting arms are not acceptable.

h) Where bus-zone protection is required, the bus-section circuit-breaker design shall allow for the

installation of current transformers on each side of the bus-section circuit-breaker.

i) Where vacuum interrupters are used in the circuit-breaker design, only the type tested vacuum

interrupter design or product specific code as per the type test report designation shall be offered

during tender evaluation.

3.4.2 Inter-changeability

The circuit-breaker main and secondary circuit contacts shall be such that all circuit-breakers of the

same type, current rating and auxiliary configuration are interchangeable. However, it shall not be

possible to insert a circuit-breaker of lower rating into a circuit of a higher current rating.

3.4.3 Circuit-breaker mid-mount trolley/floor-mount connections

a) Where the control connections between the circuit-breaker mid-mount/floor-mount trolley and the

circuit-breaker compartment are made by means of flexible connections these shall be contained in

a flexible conduit.

b) If metallic conduit (between the control plug and circuit-breaker) is provided, this shall be covered by

an approved insulating material. A means shall be provided to retain the flexible connection out of

the path of the circuit-breaker when the mid-mount trolley/floor-mount is inserted into or removed

from the circuit-breaker compartment.

c) Where control connectors are of the multi-pin design the connecting pins and female studs shall be

of the removable design and secured into position.

3.4.4 Mechanisms and Closing Devices

a) Mechanisms as per SANS 62271-1, SANS 62271-100, SANS 62271-102 and SANS 62271-200

shall be provided.

b) All conventional circuit-breakers and actuator circuit-breakers electrically-operated closing devices

including mechanism charging motors shall be suitable for operation at any voltage between 85%

and 110% of nominal control voltage measured at the terminals of the device.

c) The circuit-breaker shall close correctly when an electrical closing pulse of 100 ms duration is

applied to the closing coil.

d) The total power drawn by the closing coil, excluding closing solenoids, shall not exceed 1200 VA per

circuit-breaker.

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

3.4.5 Tripping Devices

a) All conventional circuit-breakers and actuator circuit-breakers electric tripping devices shall be of the

shunt type, suitable for operating at any voltage between 85% and 110% of the rated control voltage

measured at the device terminals.

b) Two normally-open auxiliary contacts in parallel shall be included per tripping circuit in series with

the trip coil.

c) Circuit-breakers design shall make provision for the installation of a second tripping coil as per the

voltage specified. This second trip coil shall form an integral part of the design of the circuit-breaker

complete with interlocking.

d) Circuit-breakers design shall make provision for the installation of an under voltage release coil as

per the voltage specified in MV Switchgear Schedule 240-77300784.

e) This under voltage release coil shall form an integral part of the design of the circuit-breaker

complete with interlocking.

f) Where a circuit-breaker is used for safety application, such as Boiler Protection Systems, it shall

meet the specified safety integrity level (SIL) requirements as a minimum. A confirmation that safety

requirement is met must be provided with tender submissions in the form of certification to SANS

61508 or SANS 61511 whichever applicable, datasheet of under voltage release coil, safety

application notes, etc.

3.4.6 Indicating Devices

a) A positive driven mechanical indicating device to show whether the circuit-breaker is open or closed

shall be provided. The devices are labelled as follows:

1. Circuit-breaker close: ON or I – white lettering on a red background

2. Circuit-breaker open (Trip): OFF or O – white lettering on green background

Note: The Eskom colour coding convention for trip/close actuators is opposite to that specified in IEC 60073 (i.e.

IEC requires trip red and close green).

b) Lettering size shall not be less than 10 mm. The method of securing the labels shall be as per the

requirements of this standard.

c) Where the circuit-breaker position is not visible from the front of the panel, a positive driven

mechanical indicator shall be provided to indicate whether the circuit-breaker is in the service or

disconnected position, or state the position of the integral-connected disconnector, whichever is

applicable.

d) All mechanical indicators shall be clearly visible from the front of the panel and are type tested for

the number of operations of the operating device to prove the reliability of the indicating mechanism.

3.4.7 Auxiliary Contacts

a) Auxiliary contacts shall be readily accessible and the preference shall be for contacts with a

pronounced wiping action.

b) Sufficient auxiliary contacts shall be provided as per the schematic drawings and the requirements

for spare contacts.

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

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c) The spare contacts shall be easily replaceable with normally open or normally closed contacts and

shall be wired to the outgoing control terminals. Auxiliary contacts positively follow the action of the

main contacts.

d) Suitable arrangements shall be made to ensure that circuit-breaker auxiliary contacts only signal the

change of state when the circuit-breaker is in the service and disconnected position.

e) Where insufficient contacts are available, a continuously rated slave relay shall be provided but is

used for indication circuits only.

3.4.8 Control Connector

a) Control connectors shall be of the multi-pin design with removable pins for male and female

connectors.

b) Connectors shall be of on load design.

c) Control connectors shall have the facility to be coded to differentiate between different circuit-

breaker types, ratings and functions or protection schemes for the same rated circuit-breakers.

3.4.9 Insulation Level

a) Internal insulation and clearances in air shall comply with the requirements for live conductors in

accordance with SANS 876; unless otherwise proven by dielectric and partial discharge type testing

to the required insulation levels.

Note: In general, this type of air-insulated switchgear is designed for either type 1 (bare) or type 2

(shrouded/covered) live conductor arrangements in accordance with SANS 876.

b) The insulation level of all circuit-breakers, busbars, busbar connections and any other related

components shall be in accordance with the values specified in MV Switchgear Schedule 240-

c) The use of insulation material barriers for phase segregation to increase the insulation level shall be

not acceptable if not type tested.

d) No insulation material shall be used that may lead to material ageing and degradation for the

insulation levels specified over time, or may lead to partial discharge of the panel due to ageing or

possible dust collection.

e) Where insulating materials are part of the integral design of the switchgear, the life expectancy shall

be guaranteed by means of testing where applicable and material data sheets for the prescribed

installation conditions.

3.5 Disconnectors

a) Disconnector shall be in accordance with SANS 62271–102.

b) All disconnectors shall be of the air-break, triple-pole, gang-operated type.

c) Use of fully functional circuit-breaker switchgear panel in the racked out (disconnected) position to

fulfil the on-load isolation purpose is allowed.

d) The disconnector position indicator shall be visible from the front of the panel. A positive driven

mechanical indicating device to show whether the disconnector is open or closed shall be provided.

The requirements in Clause 3.4.6 also apply to disconnector.

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

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e) All disconnectors shall be operated by means of a handle and from the front with the panel door

closed.

f) Provision shall be made for a mechanism that enables padlocking in both the “ON” and “OFF”

positions to inhibit operation of the disconnector.

g) The closing operation of the disconnector shall require minimal application of speed and force on the

operating handle.

3.6 Earthing devices

3.6.1 General

a) Earthing devices shall be in accordance with SANS 62271–102.

b) The switchgear design shall include busbar and cable earthing devices as an integral part of the

associated functional unit.

c) All earthing devices shall be operated from the front and outside of the panel.

d) Earthing switches shall be fitted with motorising mechanism to allow for applying of earth remotely.

e) Provision shall be made for a mechanism that enables padlocking in both the “ON” and “OFF”

positions to inhibit operation of the earthing devices.

f) Interlocks shall be provided in accordance with SANS 62271-200.

g) Earthing of cables or busbars via the enclosure and supporting structures shall not be acceptable.

h) The earthing device position indicator shall be visible from the front of the panel. A positive driven

mechanical indicating device to show whether the earthing device is open or closed shall be

provided. The requirements in Clause 3.4.6 also apply to earthing devices.

3.6.2 Busbar Earthing Devices

a) Busbar earthing devices shall be provided for the main busbars.

b) Busbar earthing devices shall be used to provide connection between all three phases of the main

busbars and main earth bar through isolating bushings where applicable.

c) The busbar earthing device may only be mounted in the busbar compartment.

3.6.3 Cable Earthing Device

a) Cable earthing switches shall be provided for all incoming and feeder circuit panels.

b) Interlocking shall be required for the cable earthing device to be applied before the cable

compartment door or cover can be opened.

c) Interlocking shall also be provided for utilizing the cable live indication system (VDS) to prevent

closing of the earthing switch onto live cables.

d) Cable earthing devices shall be connected between all three phases of the cable terminals and main

earth bar.

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

3.7 Special requirements for generator circuit-breaker

3.7.1 General

a) This standard includes requirements for 10 to 100MVA generator circuit-breakers and it excludes

requirements for generator circuit-breakers that are rated 100 MVA and above. These generator

circuit-breakers are housed in an AC metal enclosed switchgear and controlgear.

b) Metal enclosed switchgear and controlgear used for power generation and export system shall

comply with all the requirements of this Eskom MV Switchgear standard with the following

exceptions;

1. The earthing switches’ short-circuit making capability (electrical endurance class) shall be rated

above the anticipated earth fault level.

2. The rated short-time withstand current and duration of the earthing switch may not match that

of the functional unit/panel and shall be rated above the anticipated fault level.

c) The circuit-breaker duty cycle of “CO – 30 minutes – CO” is applicable only in the case of the rated

short-circuit current interruption duty. For non-fault interruption, the duty of “CO - 3 minutes – CO” is

applicable.

3.8 Accessories

3.8.1 Current Transformers

a) Current transformers shall comply with SANS 61869 part 1 and 2.

b) Current transformers shall be installed inside the associated functional unit such that they are easily

accessible and removable.

c) The short-time withstand current rating of current transformers shall not be less than that of the

associated circuit-breaker.

d) Secondary windings of current transformers shall be earthed at one point only. Each group of

current transformers (i.e. protection, metering etc.) shall be earthed to the earth bar using solid wire.

e) All current transformers shall be of air-cooled design and the cooling shall be through natural flow of

air.

f) Additional rating plates made of a durable material shall be provided with markings as per

SANS 61869-2. The information on the additional rating plates shall be duplicated from that

appearing on each current transformer and shall be located within the low voltage compartment in a

position giving easy visibility.

g) The phase colour with which each current transformer is associated shall appear on the CT name

plate that is mounted inside the LV compartment door.

3.8.2 Voltage Transformer

a) VTs shall comply with SANS 61869 part 1 and 3.

b) VTs shall be of the resin encapsulated type and air-cooled design. The cooling shall be through

natural flow of air.

c) VTs shall be of the single-phase design, where applicable for motor starter panels.

Controlled disclosure

When downloaded from the EDMS, this document is uncontrolled and the responsibility rests with the user to ensure it is in line

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

d) VTs s shall be of the withdrawable type.

e) The primary side of busbar connected VT panels shall be connected to the busbars via adequately

rated HRC fuses. It shall not be possible to gain access to these HRC fuses with the VT in the

service position.

f) The busbar connected VT shall be of the plug-in type and arranged such that it can be isolated and

removed without affecting the associated circuits.

g) When VTs are withdrawn, the spouts shall be closable by means of automatic shutters. The

shutters shall have padlocking facilities.

h) Provision shall be made to enable locking of the busbar connected VT in the “service” position.

i) All VTs shall be star primary and star secondary connected. The VT shall be earthed at both the

primary and secondary star points.

j) The circuit on the secondary side of the VT shall be protected with the use of either fuses or mcb’s.

The protection devices shall be mounted on the VT in order to include the wiring from the VT to the

LV compartment in the protected circuit.

k) The secondary fuses of the cable VT shall be easily accessible without any danger of having to work

in a live chamber. No fuses or mcb’s shall be fitted in a phase-circuit that is connected to earth.

l) The VT shall be connected to the earth bar by means of solid wires.

3.8.3 Indicating and Measurement Instruments

a) All instruments shall be of the flush-mounting industrial type in accordance with IEC 60051 for

indicating instruments of Class 1.5 category.

b) Transducers shall conform to IEC 60688.

3.8.4 Cable and Busbar Live Indicators

An “integrated” voltage detection system (VDS) with fixed voltage indicators and test points in

accordance with SANS 61243-5 shall be provided for cable live indication on each incomer and feeder

panels, and busbar live indication on each bus section and/or bus coupler panel.

3.8.5 Wiring and Cable Lugs

a) Control wiring lugs and their application with different types of terminals shall be in accordance with

Drawing 0.00-10341 Sheets 1 to 4.

b) Crimping on of power lugs shall be in accordance with SANS 61238-1. Crimping tools shall be re-

calibrated according to their manufacturer’s standards.

3.8.6 Nameplates and Labels

a) Each switchgear panel shall be labelled in accordance with the nameplate requirement of SANS

62271-200. In addition to the requirements of SANS 62271-200.

b) Each circuit-breaker shall be separately labelled in accordance with the nameplate requirement of

SANS 62271-100. The following additional information shall be provided for the circuit-breaker

operating mechanism:

1. Type designation,

Controlled disclosure

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with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

2. Manufacturer OEM name,

3. The relevant SANS reference number,

4. Trip-coil voltage, current, d.c. resistance (at 20 0C),

5. Close-coil voltage, current, d.c. resistance (at 20 0C), and

6. Motor voltage and current (starting peak current and nominal running current).

c) Each switchboard labels shall be provided with a labels which complies with the standards found in

240-71432150 and 0.00-10343 Sheets 1 and 2.

d) Main, circuit description, components and operating labels shall be in accordance with 240-

3.9 Switchgear interlocking systems

a) All interlocks shall be in accordance with SANS 62271(relevant parts).

b) Mandatory mechanical interlocks shall be provided for the withdrawable circuit-breakers to ensure

that:

1. The circuit-breaker can only be engaged and disengaged to/from the service position when the

circuit-breaker main contacts are fully open.

2. The circuit-breaker can only be operated when it is in the service, or disconnected or test

position.

3. The circuit-breaker compartment front cover or door is trapped in the close position and cannot

be removed/opened when the circuit-breaker is in the service position and during racking of the

circuit-breaker.

4. Integral earth switches, if fitted, cannot be closed unless the circuit-breaker is in the disconnected

position and cable VDS indication is dead.

5. For flexible auxiliary connections, the multi-pin connector must be engaged and the control

supply switched on to enable the circuit-breaker to be placed in the service position.

6. Circuit-breakers cannot be closed unless the cable earth switch is in the open position.

7. Busbar earthing is only possible when all busbar supply circuit-breakers and circuit-breakers of

feeder panels are in the disconnected position.

8. With the circuit-breaker in the disconnected position and the circuit-breaker compartment door

open, the circuit-breaker cannot be moved from the disconnected position to the service position.

9. The cable compartment door can only be open if the earth switch is in the earthed position (i.e.

earth switch applied).

c) The requirements for non-mechanical interlocks shall conform to required operating philosophy

presented by Eskom, defined schematic drawings and SANS 62271-200.

d) Where blocking magnets are used as part of the system interlocking, the rating of the blocking

magnets shall be continuously rated and shall comply with the control voltage rating and variations.

e) Where electrical system interlocking is preferred, the details shall be specified by Eskom.

Controlled disclosure

When downloaded from the EDMS, this document is uncontrolled and the responsibility rests with the user to ensure it is in line

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

3.10 Testing

3.10.1 Type Test

a) The type tests shall be carried out on all types of functional units in accordance with SANS 62271-

b) Where extension of validity of type tests is performed, SANS 62271-307 guide shall be used to

perform interpolation of characteristics covering various designs and rating aspects.

c) The electrical components affecting the performance of the functional unit shall be type tested in

accordance with the relevant parts of SANS 62271 and other applicable standards.

d) CTs shall be type tested in accordance with SANS 61869 part 1 and 2.

e) VTs shall be type tested in accordance with SANS 61869 part 1 and 3.

f) Cable live indicators shall be type tested in accordance with SANS 61243-5.

g) The indoor switchgear panels (functional units) shall be type tested in accordance with SANS

62271-200, under the authority of a laboratory accredited by a full member (MRA signatory) of ILAC

(International Laboratory Accreditation Cooperation). Type test authorities for switchgear and

controlgear shall be accredited in accordance with ISO 17025.

h) All type tests and extension of validity of type tests shall be verified and accepted by Eskom before

manufacturing can start.

3.10.2 Routine Tests

a) Routine tests shall be performed on each of the functional units and associated components.

b) Switchgear and controlgear shall be routine tested in accordance with the relevant parts of SANS

c) CTs shall be tested in accordance with SANS 61869-2.

d) VTs shall be tested in accordance with SANS 61869-3.

e) All the other components forming part of the functional unit shall be tested in accordance with the

applicable standards to prove functionality.

f) For prototype panels, full range of the required routine tests shall be conducted in accordance with

SANS 62271 (all relevant parts) and witnessed by Eskom.

3.10.3 Special Test – Open door LV compartment

a) The LV compartment design shall ensure that no internal arc flashover or debris within the circuit

breaker, busbar or cable compartments shall vent into the LV compartment i.e. the internal arc

classification achieved for the switchgear panels shall be of such a nature that opening the LV

compartment door does not compromise the type tested IAC. Sufficient proof shall be submitted

from the already performed IAC type tests performed to proof that. If no proof can be submitted

during tendering, the re-type testing of the complete switchgear panel with LV compartment door

open for internal arc classification shall be required prior to contract conclusion.

If no proof can be submitted during tendering, the re-type testing of the complete switchgear panel

with LV compartment door open for internal arc classification. The following are the requirements;

Controlled disclosure

When downloaded from the EDMS, this document is uncontrolled and the responsibility rests with the user to ensure it is in line

with the authorised version on the system.

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

3.2.16.4 Vermin and Fire Proofing of Cable Compartment and LV Compartment ..................................... 21

3.2.17 Earthing ................................................................................................................................................. 21

3.2.18 Busbar Extension Dummy Panels ......................................................................................................... 22

3.3 Special consideration for internal arc proof design ......................................................... 22

3.4 Circuit-breakers ..................................................................................................................................... 22

3.4.1 General .................................................................................................................................................... 22

3.4.2 Inter-changeability ................................................................................................................................... 23

3.4.3 Circuit-breaker mid-mount trolley/floor-mount connections .................................................................... 23

3.4.4 Mechanisms and Closing Devices .......................................................................................................... 23

3.4.5 Tripping Devices ...................................................................................................................................... 24

3.4.6 Indicating Devices ................................................................................................................................... 24

3.4.7 Auxiliary Contacts .................................................................................................................................... 24

3.4.8 Control Connector ................................................................................................................................... 25

3.4.9 Insulation Level ....................................................................................................................................... 25

3.5 Disconnectors ......................................................................................................................................... 25

3.6 Earthing devices ..................................................................................................................................... 26

3.6.1 General .................................................................................................................................................... 26

3.6.2 Busbar Earthing Devices ......................................................................................................................... 26

3.6.3 Cable Earthing Device ............................................................................................................................. 26

3.7 Special requirements for generator circuit-breaker ........................................................ 27

3.7.1 General .................................................................................................................................................... 27

3.8 Accessories ............................................................................................................................................... 27

3.8.1 Current Transformers .............................................................................................................................. 27

3.8.2 Voltage Transformer ................................................................................................................................ 27

3.8.3 Indicating and Measurement Instruments ............................................................................................... 28

3.8.4 Cable and Busbar Live Indicators ........................................................................................................... 28

3.8.5 Wiring and Cable Lugs ............................................................................................................................ 28

3.8.6 Nameplates and Labels ........................................................................................................................... 28

3.9 Switchgear interlocking systems .................................................................................................. 29

3.10 Testing ....................................................................................................................................................... 30

3.10.1 Type Test ............................................................................................................................................... 30

3.10.2 Routine Tests ........................................................................................................................................ 30

3.10.3 Special Test – Open door LV compartment .......................................................................................... 30

3.11 Maintenance and operation ............................................................................................................. 31

3.11.1 Maintenance and Operating Tools ........................................................................................................ 31

3.11.2 Maintenance and Operating Instructions .............................................................................................. 31

3.12 Training ..................................................................................................................................................... 31

3.13 Documentation ....................................................................................................................................... 31

3.13.1 Language............................................................................................................................................... 31

3.13.2 Type Test Reports ................................................................................................................................. 31

3.13.3 Manuals and Drawings .......................................................................................................................... 32

3.14 Packaging, transportation and handling ................................................................................. 32

3.15 Spares ........................................................................................................................................................ 33

3.15.1 Availability of spares .............................................................................................................................. 33

3.15.2 Identification of spares .......................................................................................................................... 34

4. Authorisation .................................................................................................................................................. 34

5. Revisions ............................................................................................................................................................ 35

6. Development team ......................................................................................................................................... 35

7. Acknowledgements ...................................................................................................................................... 35

Annex 1: technical schedule c- type testing requirements .......................................................... 36

Annex 2: technical a & b schedule for generation air-insulated withdrawable ac

Metal-enclosed switchgear and controlgear for rated voltages above 1kv up

To and including 52kv .................................................................................................................................. 40

Annex 3: mv switchgear schedule .............................................................................................................. 60

[37] SANS 1195 Busbars.

[38] SANS 1411-1 Materials of Insulated Electric Cables and Flexible Cords: Part 1: Conductors.

[39] SANS 61213 Mechanical Cable Glands.

[40] SANS 60060 High-Voltage Test Techniques.

[41] SANS 60269 Low-Voltage Fuses.

[42] SANS 60947 Low Voltage Switchgear and Controlgear. All parts

[43] SANS 61238-1 Compression and Mechanical Connections for Power Cables for Rated Voltages

up to 30 kV(Um=36kV) Part 1: Test methods and requirements.

[44] IEC 60051 Direct-Acting Analogue Electrical Measuring Instruments and their Accessories.

[45] IEC 60688 Electrical Measuring Transducers for Converting AC and DC Electrical Quantities

to Analogue or Digital Signals.

[46] IEC/IEEE 62271-37-013 High-Voltage Switchgear and Controlgear – Part 37-013: Alternative –

current generator circuit-breakers.

[47] IEEE Std C37.013a Standard for AC High Voltage Generator Circuit-breakers Rated on a

Symmetrical Current Basis – Amendment 1: Supplement for Use with Generator

Rated 10-100 MVA.

[48] ISO 17025 General Requirements for the Competence of Testing and Calibration Laboratories

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

[49] ISO 9001 Quality Management Systems.

[50] CDA Publication 22 Copper Development Association (CDA), Publication 22, Copper for

busbars.

[51] IEC 60038 Standard Voltages.

[52] IEC 60518 Dimensional standardisation of terminals for high-voltage switchgear and

controlgear.

[53] EPRI 10003471 Electrical Connector Guideline.

2.2.2 Informative

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

3.2.8 Degree of Protection

a) The required minimum degree of protection shall be in accordance with SANS 60529:

1. IPXXB for live parts (inside LV compartment), and

2. IP3X for cable boxes.

b) The degrees of protection of the switchboard offered shall be IP4X.

3.2.9 Panel Fasteners, Doors and Covers

a) Fasteners used in the construction of the functional unit shall not deviate from those used in the type

tested panels.

b) If the panel fastener is also the locking mechanism, provision shall be made for a padlock with

dimensions as specified in Figure 1.

c) Where the design allows for lift-off covers for the cable compartment, the cover shall be

mechanically interlocked with the cable earthing device. The cover shall only be removed if the

cable earth switch is applied.

d) All compartment doors housing a circuit-breaker or Busbar VT shall be fitted with a front window, for

the purpose of indicating the mechanical status of the component within, that was part of the type

testing for internal arc compliance.

e) Cable compartments shall be fitted with a bolted cover or doors. Interlocks are mandatory when

accessing the cable VT.

f) Cable compartment doors shall be tool-based accessible and lockable.

g) Where doors are provided for empty compartments, the doors shall be pad-lockable with a padlock

as shown in Figure 1.

Figure 1: Eskom standard padlock.

3.2.9.1 Padlocking facilities

a) Facilities shall be provided to padlock the following:

1. all orifice shutters individually in the closed position;

2. the circuit-breaker in each of the service and test/disconnected positions;

3. the integral earthing switches in both the open and earthing positions; and

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

c) DO NOT CLIMB ON TOP OF THE SWITCHGEAR WHEN ENERGISED. The labels shall be

installed at the rear and the sides of the switchboard. The number of labels on the rear shall depend

on the length of the board.

d) DO NOT STEP ON THE PRESSURE RELIEF FLAPS. The labels shall be installed at locations

clearly visible and in close vicinity to the flaps.

e) The warning labels shall be of red lettering on a white background.

3.2.12 Busbars and Connections

a) The main busbars compartment and connections inside the busbar compartment shall be air

insulated and the clearances shall not compromise the specified voltage withstand levels. The

busbars shall be supplied as per the type tested arrangement, including any additional insulation

shrouding or tubes that were used.

b) Cables are not allowed to be used for busbars or busbar connections inside the circuit-breaker,

busbar voltage transformer and busbar compartments.

c) All busbars shall be marked per panel in such a manner that they shall be easily identifiable as to

the phase or pole they are connected to when covers are removed. It is recommended to use heat

shrink tube for marking however, the material used for marking the busbars is subject to Eskom

acceptance.

d) Busbar connections shall be made with at least two bolts and the overlap is sufficient to ensure

ample mechanical strength and joint conductivity. The busbar connections shall match those of a

type tested panel. Silver tinted or tinted copper joint interfaces are preferred.

3.2.13 Spouts, Bushings and Insulators

a) Moulded type bushings and spouts shall be used as the connection between circuit-breakers and

busbars.

b) All bushings and insulators shall have permissible levels of partial discharge in accordance with

SANS 62271-200.

3.2.14 Insulating Materials

a) The insulation material shall be identical to the material used during voltage withstand and

temperature rise type testing.

b) Insulating materials may be used in areas where the insulation level criteria cannot be met with air

as an insulating medium.

c) Where insulation on busbars is required, it shall be of the heat shrink type with non-static

characteristics.

d) Where insulating barriers are required, the material used shall be of a non-static type.

3.2.15 Auxiliary Circuit Wiring and Identification

a) The wiring, terminals, lugs, identification and installation shall be in accordance with Drawing

0.00/10341.

with the authorised version on the system.

Generation Air-Insulated Withdrawable AC Metal-Enclosed Unique Identifier: 240-56227573

Switchgear and Controlgear for Rated Voltages above 1kV up Revision: 2

to and including 52kV Standard Page:

3.10 Testing

3.10.1 Type Test

a) The type tests shall be carried out on all types of functional units in accordance with SANS 62271-

b) Where extension of validity of type tests is performed, SANS 62271-307 guide shall be used to

perform interpolation of characteristics covering various designs and rating aspects.

c) The electrical components affecting the performance of the functional unit shall be type tested in

accordance with the relevant parts of SANS 62271 and other applicable standards.

d) CTs shall be type tested in accordance with SANS 61869 part 1 and 2.

e) VTs shall be type tested in accordance with SANS 61869 part 1 and 3.

f) Cable live indicators shall be type tested in accordance with SANS 61243-5.

g) The indoor switchgear panels (functional units) shall be type tested in accordance with SANS

62271-200, under the authority of a laboratory accredited by a full member (MRA signatory) of ILAC

(International Laboratory Accreditation Cooperation). Type test authorities for switchgear and

controlgear shall be accredited in accordance with ISO 17025.

h) All type tests and extension of validity of type tests shall be verified and accepted by Eskom before

manufacturing can start.

3.10.2 Routine Tests

a) Routine tests shall be performed on each of the functional units and associated components.

b) Switchgear and controlgear shall be routine tested in accordance with the relevant parts of SANS

c) CTs shall be tested in accordance with SANS 61869-2.

d) VTs shall be tested in accordance with SANS 61869-3.

e) All the other components forming part of the functional unit shall be tested in accordance with the

applicable standards to prove functionality.

f) For prototype panels, full range of the required routine tests shall be conducted in accordance with

SANS 62271 (all relevant parts) and witnessed by Eskom.

3.10.3 Special Test – Open door LV compartment

a) The LV compartment design shall ensure that no internal arc flashover or debris within the circuit

breaker, busbar or cable compartments shall vent into the LV compartment i.e. the internal arc

classification achieved for the switchgear panels shall be of such a nature that opening the LV

compartment door does not compromise the type tested IAC. Sufficient proof shall be submitted

from the already performed IAC type tests performed to proof that. If no proof can be submitted

during tendering, the re-type testing of the complete switchgear panel with LV compartment door

open for internal arc classification shall be required prior to contract conclusion.

evaluations.

reports and type test videos shall be submitted for Eskom tender evaluations. During design phase

applicable standards to prove functionality.

[48] ISO 17025 General Requirements for the Competence of Testing and Calibration Laboratories

[49] ISO 9001 Quality Management Systems.

This is a technical standard document outlining the minimum protection requirements for medium voltage (MV) and low voltage (LV) plant at Eskom power stations.

• Purpose: To be used as a standard when purchasing new protection schemes.
• Scope: Presents principles for electrical protection of MV and LV equipment, describing general tripping principles, protective relay functions, and associated equipment aspects.
• Applicability: Applies throughout Eskom Holdings Limited Divisions.
• The document includes extensive definitions, abbreviations, and detailed technical requirements for protection functions, tripping, settings, instrument transformers, DC supplies, grading, technologies, and specific protection applications (switchgear, cables, transformers, motors).
• Note: A memorandum indicates that MV protection portions have been superseded by a newer standard.

{"name":null,"email":null,"phone":"016 457 5295","department":null,"address":null}

While explicit commercial eligibility criteria (like B-BBEE, registration) are not stated in these technical excerpts, eligibility will be strongly determined by technical capability. Suppliers must have proven expertise in high-voltage electrical engineering, specifically in MV switchgear protection systems compliant with Eskom's stringent and proprietary standards. Experience working on Eskom Generation power stations is highly advantageous. Suppliers must be able to access and apply the latest controlled Eskom standards.

This is a technical standard document, not a tender specification. The document outlines minimum protection requirements for MV and LV plant at Eskom power stations. It is intended as a standard for purchasing new protection schemes.

• Scope: Describes principles for electrical protection of MV and LV equipment in power stations, including tripping principles, protective relay functions, and associated equipment.
• Applicability: Applies throughout Eskom Holdings Limited Divisions.
• Key technical requirements:
• Protection must safeguard personnel and primary plant against faults and abnormal conditions.
• Main protection (e.g., differential, instantaneous overcurrent) must be instantaneous (<20ms) for critical/high fault level plant.
• Back-up protection (e.g., IDMT overcurrent/earth fault) is required on all plant.
• MV switchgear circuit breakers must be withdrawable type.
• LV switchgear breakers must be MCCBs or MCBs; no fuses on AC systems.
• All voltage functions must measure three phases and have fuse fail protection.
• All circuits require DC fail and trip circuit supervision.
• Equipment must be compatible with IEC 61850 and have GPS/time sync capability.
• Relay integration and configuration must be done by the contractor in conjunction with Eskom.
• Detailed specifications are provided for instrument transformers, auxiliary DC supplies, grading, protection technologies, and specific protection for switchgear, cables, transformers, motors, and earthing resistors.
• Note: A memorandum states that MV protection requirements in this standard have been superseded by a new standard (240-143485806). Specific excluded sections include Transformer Differential (for transformers >5MVA), MV Motor Protection, and Earthing Resistor Protection.

No specific compliance requirements (like CSD, tax, CIDB) are stated in the document.

• B-BBEE: A minimum Level 3 is noted, but this appears to be a placeholder or external note, not extracted from the standard itself.

The document is a technical standard focused on electrical protection, not a health and safety plan. However, it includes requirements that contribute to personnel and plant safety:

• Protection must be provided to protect personnel and primary plant against damage due to faults or abnormal conditions.
• Specific safety-related protection functions include arc detection protection for flashovers in switchgear compartments.
• Earthing requirements (resistance or solid) are specified to stabilise arcing earth faults and minimise damage.
• Temperature monitoring and protection (e.g., for transformer oil/winding, resistor oil) are required to prevent overheating.
• The standard ensures electrical systems are designed to isolate faults quickly, reducing risk to personnel and equipment.

This document is the Eskom Earthing and Lightning Protection Standard (240-56356396, Revision 2). It is not a tender document but a technical standard that defines requirements for the design, supply, installation, and testing of earthing and lightning protection systems at Eskom Generation power stations.

Primary objectives:

• Ensure personnel safety and prevent damage to installations.
• Provide a common voltage reference and mitigate disturbances caused by lightning, electrical faults, or normal plant operation.

Scope: Applies to electrical and instrumentation systems within Eskom Generation.

The document includes extensive definitions, referenced standards, design principles, material specifications, installation guidelines, and testing requirements.

While this standard document does not list explicit tender eligibility criteria, it implies that eligible bidders must possess demonstrable expertise in high-voltage power station earthing and lightning protection systems. They must have the technical capability to fully comply with the extensive Eskom and South African National Standards (SANS) referenced within the document. Proven experience mitigating challenges like copper theft and corrosion in industrial settings is advantageous.

This is a technical standard document, not a tender specification. It defines the design, supply, installation, and testing requirements for earthing and lightning protection systems at Eskom Generation power stations.

Key requirements for bidders to note:

• Scope: Applies to electrical and instrumentation systems for power station earthing and lightning protection, including design guidelines, application info, maintenance, and test plans.
• Primary Goal: Ensure personnel safety and prevent damage to installations.
• Secondary Goal: Serve as a common voltage reference and mitigate disturbances from lightning, electrical faults, or normal plant operation.
• Design Criteria:

• Limit touch and step potentials; provide a low impedance return path for fault currents.

• Target maximum earth resistance for the complete system is 10 milli-ohms, maintainable up to 45m distances.

• Protect installation against lightning, surges, spikes, and other induced interferences.

• Key Standards: Compliance with numerous referenced Eskom, IEC, IEEE, NRS, and SANS standards is mandatory (e.g., SANS 10142-1, SANS 62305 series, IEEE 665).
• Materials: Primarily annealed copper (e.g., 10mm diameter rod for earth mat, 50x3.15mm strap). Alternatives like aluminium or steel may be used in high-theft-risk areas with appropriate sizing and bonding.
• Installation: Detailed requirements for cable racking earthing, power/control cable segregation and shielding, surge protection device (SPD) zoning and coordination, and earthing of all structural elements, equipment, and buildings.
• Testing & Maintenance: Includes visual inspections, earth resistance measurements (target ≤10 milli-ohms), continuity tests, and detailed documentation.
• The document is a controlled disclosure standard (240-56356396 Rev 2) and must be used in conjunction with specific project tender documents.

The standard prescribes a detailed methodology for implementing earthing and lightning protection:

• Zoning Approach: Use a 'Zone of Protection' concept with Lightning Protection Zones (LPZ 0A to LPZ 3) to progressively attenuate electromagnetic interference. Install Surge Protective Devices (SPDs) at zone boundaries.
• Uniform Grounding: Apply equipotential grounding principles at all structural levels (floor, equipment cubicle, circuit board) to ensure electromagnetic compatibility (EMC).
• Interfacing Dissimilar Systems: Address matching problems between systems with different grounding principles using isolation transformers, opto-couplers, optical fibres, or common mode inductors.
• Installation Practices: Specific guidelines for cable racking earthing, segregation of power and control cables, shielding methodologies, and connection techniques (brazing, exothermic welding).

The document does not specify bidder experience or personnel qualifications. It defines the role of an 'Earthing Contractor' as a contractor appointed to install earthing conductors on cable racking and connect electrical/mechanical equipment to earth. It implies that contractors must have the skill to execute specialized connections (brazing, exothermic welding) which are material and skill-dependent.

The standard mandates rigorous testing, maintenance, and documentation to ensure system integrity:

• Testing & Maintenance: Includes visual inspections, earth resistance measurements (target ≤10 milli-ohms), continuity measurements, and the use of earthing triangles for testing.
• Documentation & Records: Requires maintenance of design standards, drawings, maintenance plans (PMs), test reports, visual check reports, and copper theft reports.
• Drawings & Specifications: Must comply with Eskom drawing standard 0.54/393.
• Surge Protection Devices (SPDs): Should be integrated into a routine maintenance inspection program to confirm operational status.

The document does not list standard tender compliance requirements (CSD, tax, B-BBEE, CIDB, etc.). It is a technical standard. Compliance is required with the extensive list of referenced technical standards and Eskom specifications, including:

• Eskom Standards: 0.54/393 (Earthing Standards), 240-170000153 (Copper Conductors), 240-84854974 (Continuity Measurement), 240-170000349 (Copper-Clad Steel Conductors), 240-17000053 (Exothermic Weld Connections).
• International Standards: IEC 61662, IEEE 665, IEEE 1050, NRS 042.
• South African National Standards (SANS): A comprehensive list including SANS 121, SANS 10142-1, SANS 10313, SANS 62305 series (Lightning Protection), SANS 61000 series (EMC), SANS 61643 series (Surge Protective Devices).
• Bidders must apply the most recent edition of all referenced documents.

The core purpose of the earthing system is personnel safety. Key safety-related requirements include:

• Primary Goal: Protect personnel from electric shock and prevent equipment damage.
• Design to limit touch and step potentials during fault conditions.
• Address challenges like copper theft, excavation work, and corrosion that compromise safety.
• Implement a zoning concept (Lightning Protection Zones - LPZs) to manage electromagnetic interference and protect sensitive equipment.
• Ensure proper earthing of all metal parts: conduits, cable racks, equipment enclosures, structural steel, reinforcing steel, metal roofs, and piping.
• Fire protection systems require specific earthing and EMC filtering to prevent false operations in harsh environments (e.g., Transformer yards).

The document does not contain tender evaluation criteria. It is a technical standard. The extracted text appears to be fragmented and does not describe a scoring method for bid evaluation.

• The tenderer must complete and sign the form to acknowledge and accept Eskom Supplier Quality Requirements as per 240-105658000 Specification and ISO 9001 Standard.
• The tender is for the provision of Outside Plant MV Switchgear Upgrade at Arnot Power Station for a period of 3 years.

Returnable Documents: The tenderer must complete and sign the form to acknowledge and accept Eskom Supplier Quality Requirements as per 240-105658000 Specification and ISO 9001 Standard.

• The project replaces obsolete and unsafe outside plant MV switchgear at Arnot Power Station to improve safety and reliability.
• The scope covers design, supply, installation, testing, commissioning, and handover of new MV switchgear, battery chargers, control cabling, structures, and HVAC systems.
• The document includes technical schedules, single line diagrams, equipment lists, protection schemes, and cable routing details.

• The project involves replacement of outside plant MV switchgear at Arnot Power Station for improved safety, reliability, and maintainability.
• The scope includes decommissioning and removal of existing MV switchgear, battery chargers, extraction fans, and associated cabling.
• Installation of new MV switchgear complying with Eskom standards: 240-56227573 (air-insulated withdrawable switchgear), 240-56030406 (ring main units), and 240-143485806 (protection standards).
• New switchgear must be fitted with latest technology protection schemes (IED relays or self-powered relays) as per equipment schedule.
• Replacement and testing of power cables as per Eskom standard 240-56227443.
• Provision of support structures, HVAC upgrades in switchgear rooms, and interface with existing control systems (C&I).
• Cable works include routing, replacement, testing, termination, and compliance with SANS standards for cable types (e.g., PILCSWA, PVC/SWA/PVC, XLPE).
• Detailed switchgear schedules specify technical requirements for multiple boards (e.g., 11kV Station Boards, Coal Conveyor Boards, ASQ Boards, Sewage Plant Board) including ratings for voltage, current, fault current, impulse withstand, etc.
• The contractor must update as-built drawings, including single line diagrams, cable schedules, substation layouts, and schematic diagrams.

• The design must ensure standardization for operation, maintenance, and lifecycle cost reduction.
• All components and materials must be new.
• Equipment must function under ambient environmental conditions at the plant.
• Safety requirements include: no mounting on removable walkways, shielding of live parts, and lockable enclosures with padlock provision.
• The contractor must employ a uniform design approach across works for compatibility and interoperability.
• Maintenance plans with intervals and work instructions must be documented.
• Use of readily replaceable components to minimise outage times.
• Compliance with Eskom standards referenced in the technical specification is mandatory.

• Evaluation will assess compliance with engineering requirements, quality control, supply, installation, training, testing, commissioning, and handover.
• Bidders must adhere to Eskom design guidelines, including HVAC (240-70164623) and thermal insulation standards (240-56247004).

• Contract for the provision of Outside Plant MV Switchgear Upgrade at Arnot Power Station for a period of 3 years.
• Contract documents include Part C1 Agreements & Contract Data, Part C2 Pricing Data, Part C3 Scope of Work, and Part C4 Site Information.

• Completion date for the whole of the works: 31 December 2030.
• Key dates: Detail Design due 30 January 2027; Design Approval due 30 March 2027.
• Defects date: 52 weeks after completion of the whole works.
• Access dates: To be specified per part of the site.
• Contractor must submit first programme for acceptance within 2 weeks of the Contract Date.
• Contractor submits revised programmes at intervals no longer than 4 weeks.
• Assessment interval for payments: between the 25th day of each successive month.
• Payment period: 4 weeks from assessment.

• Project Manager: Donald Mabena, email [email protected], address Private Bag X2, Rietkuil, 1097.
• Supervisor: Lesego Kehimile, address Private X2, Rietkuil, 1097.
• Employer: Eskom Holdings SOC Ltd, registered office Megawatt Park, Maxwell Drive, Sandton, Johannesburg.
• Adjudicator: To be selected from ICE-SA Division panel (www.ice-sa.org.za) or appointed by AFSA if parties cannot agree.

• Submit the completed Form of Offer and Acceptance (C1.1) with all required signatures.
• Include the Schedule of Deviations if any deviations from the tender documents are agreed.
• The tenderer must provide their CIDB registration number (if applicable) on the Offer form.
• The Employer will return one copy of the signed Form of Offer and Acceptance, including the Schedule of Deviations, to the tenderer before the end of the validity period.
• Failure to provide required securities, bonds, guarantees, proof of insurance, or other documentation within two weeks of receiving the signed agreement may constitute repudiation.

• Tenderer must complete Contract Data Part Two, including Contractor name, address, contact details, key persons, fee percentages, activity schedule, and tendered total of Prices.
• Guidance notes available from Engineering Contract Strategies (tel 011 803 3008, www.ecs.co.za).
• Tender schedule must include CVs for key persons.

Contractor must complete Part 2 of Contract Data (to be provided at tender stage); have relevant experience in MV switchgear upgrades; comply with South African law; potentially require CIDB registration (if applicable); must not have conflicts of interest or engage in prohibited actions (corruption, fraud, etc.); joint ventures must declare structure and accept joint liability; must maintain B-BBEE status throughout contract period.

• Scope: Outside Plant MV Switchgear Upgrade at Arnot Power Station, including supply, installation, testing, and commissioning of 11kV switchgear and associated systems.
• Key components: 11kV Station Boards 1 and 2, 11kV Conveyor Boards 1-9, Ring Main Units (RMUs), protection relays, CTs, VTs, SCADA interfaces, and DC chargers.
• Works include decommissioning and removal of existing switchgear and chargers, design, local protection and automation devices, cable joints, terminations, construction, erection, and commissioning.
• Site establishment includes provision of containers (kitchen, storage, ablution), safety files, medicals, police clearances, PPE, and travel.
• Works Information is contained in Part C3: Scope of Work and referenced drawings.

• Contractor must provide details of key persons, including names, jobs, responsibilities, qualifications, and experience.
• CVs for key persons must be appended to the tender schedule.
• Contractor must specify direct and subcontracted fee percentages.
• Activity schedule must be prepared by Contractor, breaking down work into priced lump-sum activities linked to programme.

• Defects date is 52 weeks after completion; defect correction period is 1 week.
• Works must be without defects that would delay or be covered by immediately following work for payment.
• Quality assurance includes testing and commissioning of all supplied switchgear, protection systems, and SCADA interfaces.
• Contractor must ensure all works comply with Works Information and referenced standards.

• Pricing based on NEC3 Option A: lump sum prices for each activity in the activity schedule.
• Activity schedule includes preliminaries (site establishment, de-establishment, safety files, medicals, PPE, travel) and detailed items for switchgear supply, installation, testing, and commissioning.
• Example items: 11kV Station Board 1 includes supply of 15 panels, chargers, decommissioning, design, protection devices, SCADA, cable joints, terminations, construction, and commissioning.
• Prices must be exclusive of VAT; VAT at 15% added to total.
• Price adjustment for inflation using SEIFSA indices for labour, transport, and electrical components.

• Contract uses NEC3 Option A: Priced contract with activity schedule. Payment is based on completed activities only.
• Prices are lump sums for each activity; no part payment for incomplete activities.
• Currency: South African Rand.
• Payment terms: Assessment interval between the 25th of each month; payment within 4 weeks.
• Interest rate: Standard Bank prime rate for ZAR amounts, LIBOR for other currencies.
• Retention: 5% retention percentage; retention free amount to be specified.
• Price adjustment for inflation applies using SEIFSA indices (Labour 50%, Transport 5%, Electrical 30%, Non-adjustable 15%).
• Tax invoices must be submitted within one week of payment certificate, including Eskom VAT number 4740101508.

• B-BBEE: Contractor must notify Eskom within 7 days of any change in B-BBEE status and submit updated verification certificate within 30 days. Decrease in status may lead to re-negotiation or termination.
• CIDB registration number must be provided if applicable.
• Joint ventures are jointly and severally liable; composition changes require Employer consent.
• Compliance with all applicable health, safety, and environmental laws, including Construction Regulations 2014 and Asbestos Regulations.
• Insurance required as per Insurance Tables A and B, covering works, liability, and employer's risks.
• Confidentiality obligations apply; no disclosure of contract information without consent.
• Ethics clause prohibits corrupt, fraudulent, coercive, collusive, or obstructive actions.

• Contractor must take all reasonable precautions for health and safety on site.
• Eskom may appoint Contractor as Principal Contractor under Construction Regulations 2014.
• Contractor warrants prices include sufficient amount for compliance with health and safety laws and regulations.
• Asbestos management: Eskom ensures ambient air meets asbestos regulations; Contractor may perform parallel measurements at own cost.
• If asbestos is identified, risk assessment and control measures required; personnel may stop work until area declared safe.
• Safety requirements include safety file establishment, annual medicals, police clearances, and provision of SANS-standard PPE (flame retardant clothing, hard hats, eye protection, safety boots, ear muffs, gloves).

• Contractor must comply with all applicable environmental laws, regulations, and contract guidelines.
• Asbestos removal and disposal must be done by a registered asbestos contractor at Eskom's expense, in line with South African legislation.
• Weather data from Witbank station used for compensation events; compensation may be notified if recorded weather exceeds one-in-ten-year return values.

• Contract based on NEC3 Engineering and Construction Contract April 2013, Option A (Priced contract with activity schedule).
• Dispute resolution Option W1; secondary options include price adjustment for inflation, changes in law, sectional completion, limitation of liability, retention, and key performance indicators.
• Additional conditions (Z clauses) cover cession, joint ventures, B-BBEE status changes, confidentiality, health and safety, environmental compliance, tax invoices, compensation events, ethics, insurance, nuclear liability, and asbestos management.
• Retention percentage is 5%; retention free amount to be specified.
• Liability limitations: Contractor's liability for indirect/consequential loss limited to R0; total liability limited to total of Prices except for excluded matters.
• Defects correction period: 1 week.
• Contract law: Republic of South Africa; language: English.

• Closing date: 21 August 2026 at 10h00.
• A clarification meeting will be held on 30 July 2026 from 09h00 to 12h00 at Arnot Power Station.

• Contact Person: Phomello Thobejane.
• Email: [email protected].
• Phone: +27 13 297 9684.

Returnable documents are required but not specified in detail.

Tenderers must have a CIDB contractor grading of 8EP or 8ME or higher. Joint ventures are permitted if all members are CIDB registered, the lead partner meets the grading requirement (or is one level below), and the combined grading equals or exceeds 8EP/8ME.

• CIDB Requirements are applicable.
• Tenderers must have a Construction Industry Development Board (CIDB) contractor grading of 8EP or 8ME or higher.
• Joint ventures are eligible provided every member is registered with the CIDB, and the lead partner has a contractor grading designation in the 8EP or 8ME class of construction work (or not lower than one level below).

• Tenderers must have a CIDB contractor grading of 8EP or 8ME or higher.
• Joint ventures are eligible if all members are CIDB registered, and the lead partner meets the grading requirement (or is not lower than one level below).

• Contact details: Phone +27 13 297 9684, Email [email protected].

The tender pertains to the provision of Outside Plant MV Switchgear Upgrade at Arnot Power Station for a 3-year period. Compliance with Eskom’s OHS legal and other requirements is a critical component, as outlined in Annexure B (Acknowledgement Form).

Companies must have experience in similar MV switchgear upgrade projects, ability to manage subcontractors effectively, proven OHS compliance track record, resources to execute 3-year contract, and willingness to align company processes with ESKOM's OHS requirements post-award.

The tender requires compliance with Eskom’s Occupational Health and Safety (OHS) legal and other requirements. Key points include:

• Compliance with Eskom Contractor Health and Safety Requirements Standard 32-136, OHS specifications, Occupational Health and Safety Act 85 of 1993, and Compensation for Occupational Diseases and Illnesses Act 130 of 1993.
• Post-award, the supplier must align company processes with Eskom’s OHS policies, procedures, and standards.
• Penalties apply for non-conformance with Eskom or statutory OHS requirements by the main supplier, contractors, or sub-suppliers.
• All employees (including contractors/suppliers) must undergo Eskom and company-specific inductions.
• The main contractor/supplier must: demonstrate selection criteria for appointing sub-contractors/suppliers, notify Eskom prior to their appointment, ensure they have adequate resources and competencies, and manage their compliance with legal and Eskom requirements.
• The main supplier must monitor sub-contractors/suppliers via audits/assessments for OHS compliance and provide grounds for termination if necessary.
• Non-compliance by sub-contractors/suppliers is the main supplier’s responsibility, including performance and penalty processes.
• Eskom may verify compliance and request testimonials/references or client contact details for similar past work.

Compliance with Eskom’s OHS legal requirements is mandatory. This includes adherence to:

• Eskom Contractor Health and Safety Requirements Standard 32-136
• Occupational Health and Safety Act 85 of 1993
• Compensation for Occupational Diseases and Illnesses Act 130 of 1993
• Additional OHS specifications provided by Eskom.

• Closing date: 21 August 2026 at 10h00.
• Clarification meeting: 30 July 2026 from 10h00 to 12h00 at Arnot Power Station.

• Clarification meeting: 30 July 2026 from 10h00 to 12h00 at Arnot Power Station.

• CIDB contractor grading of 8EP or 8ME or higher is required.
• Joint ventures (JVs) are eligible if:
• Every JV member is registered with the CIDB.
• The lead partner has a CIDB grading of 8EP or 8ME (or not lower than one level below the required grading) and possesses the required recognition status.
• The combined CIDB grading of the JV meets or exceeds 8EP or 8ME, as calculated per CIDB regulations or Regulations 25(1B) or 25(7A).

• CIDB contractor grading of 8EP or 8ME or higher is required.
• Joint ventures (JVs) are eligible if:
• Every JV member is registered with the CIDB.
• The lead partner has a CIDB grading of 8EP or 8ME (or not lower than one level below the required grading) and possesses the required recognition status.
• The combined CIDB grading of the JV meets or exceeds 8EP or 8ME, as calculated per CIDB regulations or Regulations 25(1B) or 25(7A).

• Contact person: Phomello Thobejane.
• Email: [email protected].
• Phone: +27 13 297 9684.

This document is an Eskom Generation standard for Medium Voltage Protection of auxiliary plant. It provides:

• An overview of Eskom's extensive electrical reticulation system within power stations, covering both inside the power house and outside plant (common plant) areas.
• The purpose is to guide protection engineering practitioners, outlining protection philosophies and serving as a reference for new MV protection schemes on refurbished or new plants.
• It standardises best practices and specific Eskom requirements but allows for fit-for-purpose designs, requiring rigorous review before use in tender specifications.
• The scope is limited to MV protection for power system elements connected to MV sources, excluding generating unit protection, low voltage protection, and communication requirements for substation automation.
• Key definitions and abbreviations are provided for terms like back-up protection, clean/dirty DC supplies, critical plant, and various technical acronyms (IED, CT, VT, etc.).
• Roles and responsibilities are assigned to the Generation Electrical Plant CoE, protection engineering practitioners, and setting practitioners for compliance and application.

While not explicitly stated in this standard, eligibility for the related tender would implicitly require: Proven expertise in Eskom's MV protection philosophy and standards; Ability to supply and configure IEDs from Eskom's approved list (ref. 240-56227589); Engineering personnel qualified to perform protection setting calculations per this guide; Compliance with all normative references (e.g., IEC 61800-4, Eskom engineering procedures); Capability to execute work under 'Controlled Disclosure' classification.

This document is a technical standard for Medium Voltage Protection in Eskom Generation power stations. It outlines the protection philosophy, requirements, and design principles for electrical protection systems on medium voltage (MV) reticulation. Key points for bidders:

• The scope covers MV protection for power system elements inside the power house and common plant (outside plant) circuits, but excludes generating unit protection and low voltage protection.
• The document serves as a reference and guide for new MV protection schemes on refurbished or new plants, providing recommended setting values.
• It applies throughout Eskom Generation and accommodates different primary plant layouts and protection approaches.
• The protection philosophy requires each electrical fault to be detected by a main and at least one back-up protection function, powered from two different DC supplies.
• Protection must operate for primary faults but may be blocked for secondary faults (e.g., CT/VT failures) if supervision functions unambiguously detect them, with alarms triggered.
• General requirements cover control circuit design (fuse or MCB-based), redundancy (protection functions, trip coils, DC supplies), CT/VT specifications, DC supply standards (clean/dirty), and extensive interfacing with switchgear, unit control (DCS/BPS), and station control.
• The document references numerous Eskom standards and procedures (e.g., ISO 9001, engineering change management, drawing standards) that must be complied with.
• Protection IEDs and auxiliary relays must be from Eskom's approved list (240-56227589).

The document outlines the methodology for MV protection design and implementation:

• Protection philosophy requires each fault to have main and back-up detection, with protection powered from two different DC supplies.
• Supervision functions may block protection for secondary faults, with alarms triggered.
• Control circuit design follows two approaches: fuse-based or MCB-based, each with specific grading and monitoring requirements.
• Redundancy is applied to protection functions, trip coils, and DC supplies, with selector switches for DC source selection.
• Interfacing with switchgear, unit control (DCS/BPS), and station control is standardised, including binary inputs/outputs and alarm groupings.
• The methodology allows for fit-for-purpose designs but requires rigorous review.

The document specifies requirements for supervision and testing to ensure protection quality and reliability:

• Voltage and current transformer supervision functions may be used to block protection functions (e.g., current differential) for secondary faults (e.g., momentarily open CT circuits), provided back-up protection is not blocked and alarms are triggered.
• Approved test blocks must be used for secondary injection testing of IEDs without disconnecting wires; they must short-circuit CT inputs and disconnect VT quantities safely.
• Test blocks with additional contacts should isolate trip circuits when a test handle is inserted to prevent unintended tripping during testing.
• For breakers tested in any position, a breaker fail contact must be wired in series with a test block contact to prevent trip testing from initiating breaker fail trips to upstream circuits.
• De-energise-to-trip (no-volt) coils for signals like boiler protection trips must be monitored with approved relays that have a mechanical cam to simulate an energised state for testing when BPS is unavailable.
• Personnel must isolate unwanted remote tripping during testing and reinstate afterwards, with remote testing conducted to ensure no inadvertent isolations block remote operation.

The document references several normative standards and procedures that must be applied. Bidders must ensure compliance with:

• ISO 9001 Quality Management Systems.
• Eskom engineering procedures: Engineering Change Management (240-53114002), Project Engineering Change Management (240-53114026), Design Review (240-53113685), Registration for Engineering Work (240-49104739), Manage Engineering Accountability (240-53113953).
• Eskom Documentation Management Standard (32-644).
• Eskom standards for MV AC Variable Frequency Drives (240-50237146), Engineering Drawing (240-86973501), MV & LV Switchgear terminations and wiring (0.00/10341).
• International standard IEC 61800-4 for adjustable speed electrical power drive systems.
• Protection IEDs and auxiliary relays must be from Eskom's approved list (240-56227589 - List of Approved Electronic Devices).
• Note: No specific B-BBEE, tax, CIDB, or other typical tender compliance requirements are stated in the extracted content.

The document includes safety-related requirements for protection and control systems:

• Tripping and closing principles, safety tripping (especially for coal-fired plants), and BPS tripping interfaces are detailed.
• Interlocking principles prevent incorrect switching, with provisions for manual override under emergency conditions.
• Setting principles for various protection functions (e.g., DMT/IDMT over current, earth fault protection) ensure safe operation.
• Wiring and drawing requirements standardise installations.
• The protection philosophy emphasises preventing damage to plant and ensuring safe fault clearance.
• Redundancy requirements (e.g., dual DC supplies, trip coils) enhance dependability and safety.
• Interfaces with unit control (DCS/BPS) and station control include fail-safe mechanisms and alarm groupings to prevent unsafe operations.
• Breaker fail protection must trip all sources of supply and includes isolation features.
• The document stresses that regulatory and safety requirements cannot be ignored in designs.

The document references normative standards and procedures that form part of the contractual framework. Bidders must apply:

• ISO 9001 Quality Management Systems.
• Eskom procedures for Engineering Change Management (240-53114002), Project Engineering Change Management (240-53114026), Design Review (240-53113685), Registration for Engineering Work (240-49104739), and Manage Engineering Accountability (240-53113953).
• Eskom Documentation Management Standard (32-644).
• Eskom standards for MV AC Variable Frequency Drives (240-50237146) and Engineering Drawing (240-86973501).
• Eskom standard for MV & LV Switchgear terminations and wiring (0.00/10341).
• International standard IEC 61800-4 for adjustable speed electrical power drive systems.

This specification standardises and rationalises medium voltage Ring Main Units (RMUs) and IRTU fitted RMUs for Eskom, including remote terminal units and protection systems for free-standing indoor/outdoor applications. It covers distribution automation, IPP applications, high-risk enclosures, and 36 kV units for Generation and Distribution.

Returnable Documents: The full Technical Schedules B (including Test Schedules and Deviation Schedules) must be completed and submitted together with Technical Schedules A for approval at the time of tender. This includes individual RMU and IRTU fitted RMU item Technical Schedules.

Suppliers must be conversant with and comply fully with Specification 240-56030406. They must obtain all necessary supporting documents. Suppliers must have ISO 9001 Quality Management Systems (normative reference). Any deviation constitutes non-conformance unless agreed in advance by a delegated Eskom Cable Systems Specialist based on sound engineering judgement. Proof of performance for protection systems up to the circuit-breaker's rated short-circuit breaking current is required. SPRs using external DIP switches/potentiometers for settings are not accepted. Configuration software must be provided at no extra cost and be compatible with specified Windows OS.

This specification covers Eskom’s requirements for new factory-assembled Ring Main Units (RMUs) and Integrated Remote Terminal Unit (IRTU) fitted RMUs rated for three-phase cable systems from 3.6 kV to 36 kV, for freestanding indoor or outdoor operation at 50 Hz. It distinguishes between inland and coastal applications and excludes bulk metering kiosks. Key requirements include compliance with SANS 1874 and other referenced standards, specific configurations, lightning impulse withstand levels, cable test facilities, remote tripping, fuse-link specifications, protection equipment (SPR or IED), RTU requirements, DC supply, control plant enclosure, plant status controls, wiring, LV AC power supply, MV cable termination enclosures, gas pressure indication, live circuit indication, earth fault indication, padlock protection, concrete plinths, corrosion protection, documentation, testing, and marking.

Suppliers must comply with ISO 9001 and other referenced standards. Specific requirements include software/firmware version control, configuration management, test reports, and vendor responsibilities for setup and testing.

All RMUs and IRTU fitted RMUs must comply with SANS 1874 and this specification, with this specification taking precedence in case of conflict. Suppliers must be conversant with and comply with all requirements; no deviations are accepted without prior agreement from Eskom. The process for monitoring uses technical evaluation criteria and technical schedules A and B as per SANS 1874.

Safety requirements include internal arc classification testing per SANS/IEC 62271-202 for outdoor RMUs and SANS/IEC 62271-200 for indoor units, with submission of type test reports and videos for Eskom safety review. Live circuit indication and earth fault indication are mandated.

Environmental considerations include corrosion protection based on inland (medium pollution) or coastal (very heavy pollution) classifications per SANS 60815-1, with specific corrosivity ratings and detailed specifications referenced.

The specification outlines technical requirements for RMUs and IRTU fitted RMUs, including configurations, testing, protection systems, wiring, power supply, enclosures, and documentation. It references Eskom standards and drawings, with no explicit contractual terms like duration or penalties provided.

The evaluation includes detailed protection requirements for IRTU fitted RMUs with Protection IEDs, covering harmonic restraint, overcurrent and earth fault functions, directional power, live load blocking, negative phase sequence, frequency and voltage protection, measurement functions, event recording, configuration software, and sensor requirements. Suppliers must provide specific technical details in schedules.

• Provision of Outside Plant MV Switchgear Upgrade at Arnot Power Station for a period of 3 years. Tender number E3263GXPARN. Issue date 22 July 2026.

• Closing date and time: 21 August 2026 at 10:00.
• Clarification meeting/site visit: 30 July 2026 at 10:00 at Arnot Power Station. This is non-compulsory, but attendance is advised to understand requirements. Tenderers must confirm attendance with the Eskom Representative and bring full PPE if site visit is required.
• Deadline for clarification queries: 5 working days before tender submission deadline.
• Tender validity period: 12 weeks from closing date.

• Clarification meeting/site visit: 30 July 2026 at 10:00 at Arnot Power Station. Non-compulsory but advised. Confirm attendance with Eskom Representative and bring full PPE if site visit required.

• Eskom Representative: Phomello Thobejane. Telephone: 013 297 9684. Email: [email protected].
• All queries and clarifications must be addressed in writing to the Eskom Representative only.
• Fraud and corruption reporting: 0800 11 2722 / [email protected].

• Submit electronically via Eskom E-tendering site before the closing date and time. The submission status must be indicated as complete.
• Upload documents in PDF format. The price list must be submitted in both PDF and Excel format.
• Maximum upload size per document is 500 MB, total submission restricted to 4 GB. No ZIP/compressed files. No hard copies accepted.
• If resubmitting, only the latest version will be accepted; previous submissions become null and void.
• Mandatory returnables required at tender closing (disqualifiable if missing): Authorization Form (Annexure A), Acknowledgement Form (Annexure B), Tenderer’s Particulars (Annexure C), Integrity Pact Declaration (Annexure D), CPA for local/imported goods (Annexures E/F), SBD 6.2 for local content (Annexures G1-G4), SBD 1 (Annexure H), SBD 4 (Annexure J), and E-tendering Help Manual acknowledgement form.
• Non-disqualifiable returnables: SBD 6.1 Preference Points Claim Form (Annexure I). If incomplete, you may be given 5 working days to correct.
• For joint ventures: submit a letter of intent or valid JV agreement, confirmation of single business entity, and details of a single designated bank account.
• Ensure all items on the price list are priced; failure to price renders the tender non-responsive.
• Late tenders will not be accepted.

Tenderer (or JV partners) must not be under any restriction to do business with Eskom or the state; not have nationality from a sanctioned country; not submit multiple tenders (except for system limits); JV must have joint and several liability; no conflicts of interest; not restricted by National Treasury, Eskom, or on Tender Defaulters list; must have required CIDB grading of 8EP or 8ME or higher (for JV, lead partner must meet grading and combined grading must equal or exceed).

• Scope: Provision of Outside Plant MV Switchgear Upgrade at Arnot Power Station for a period of 3 years.
• Equipment requirements: All major equipment (switchgear, protection devices, data communication, cabling) must be proven technology. Submit a list of equipment/components offered.
• Experience: Provide evidence of similar projects (client references, contracts, completion certificates). Reference projects must have a minimum duration of five years since installation.
• OEM requirements: If not the Original Equipment Manufacturer (OEM), provide a license agreement letter with the OEM valid for the contract duration.
• Technical standards: Comply with IEC 62271-200 and Eskom standards 240-56227573, 240-56357424, 240-56030406, and Generation Auxiliary Plant Medium Voltage Protection Standard. Submit internal arc test certificates, short-circuit withstand certificates, routine test certificates, and accredited type test reports. If tested to other standards, provide comparison proving equivalence to IEC standards.
• Quality Management: Submit either valid ISO 9001 certification or documented QMS evidence meeting ISO 9001 requirements. Provide draft Contract Quality Plan and Quality Control Plan/Inspection and Test Plan specific to the scope.

• Provide evidence of experience in similar projects: client reference letters, contract awards, completion/commissioning certificates. Reference projects must have a minimum duration of five years since installation.
• List protection devices per Eskom standard 240-56227586 (approved electronic devices).

• Submit either valid ISO 9001 certification (with defined scope, approved authority, international accreditation, and valid expiry) OR documented QMS evidence including: QMS manual, quality policy, quality objectives, document control, control of nonconforming outputs, corrective action, and internal audit procedures.
• Provide evidence of QMS in operation: organization chart/responsibility matrix, criteria for external providers, latest internal audit report, latest certification audit report (not older than 12 months), and management review records.
• Submit draft Contract Quality Plan and Quality Control Plan/Inspection and Test Plan specific to the scope.

• Pricing schedule/BOQ is attached as a separate document. Submit completed schedule in PDF and Excel formats.
• Ensure all items are priced. Cataloguing line item required if applicable.
• No alternative tenders allowed.

• Pricing format: Submit pricing schedule/BOQ in PDF and Excel. Ensure all items are priced.
• Payment terms: For contracts below R50 million (incl. VAT), payment within 30 days of undisputed invoice. For contracts above R50 million (incl. VAT), payment within 60 days.
• Cataloguing: If required, include a line item for cataloguing in the pricing schedule; Eskom will pay for this.
• No alternative tenders allowed.
• Conditional discounts not considered in evaluation but implemented at payment.

• CIDB grading: Tenderers must have a CIDB contractor grading of 8EP or 8ME or higher. Joint ventures must have all members registered; lead partner must have at least 8EP/8ME grading.
• CSD registration is mandatory.
• B-BBEE: Submit proof of B-BBEE status level (certificate or sworn affidavit) for preference points scoring.
• Tax compliance: Local tenderers must provide SARS e-filing PIN for verification or tax clearance certificate. Foreign tenderers with South African footprint must submit tax clearance certificate; those without footprint complete SBD1 only.
• Employment Equity: South African designated employers must submit proof of compliance with Employment Equity Act.
• Safety: South African tenderers must submit COIDA certificate of good standing or proof of application.
• Environmental: Comply with all environmental legislation, Eskom SHEQ Policy, and station EMS (ISO 14001). Submit CEO/Director-signed commitment to environmental management.
• Contract Skills Development Goals (CSDG): Mandatory 0.25% for mechanical and electrical engineering works. Failure to meet renders tender non-responsive.
• Contract Participation Goals (CPG): Applicable; achieve at least 5% engagement of targeted enterprises.

• Comply with OHS Act and all applicable Eskom rules, procedures, and regulations.
• Submit Health and Safety Plan/OHS Manual specific to the site/activities.
• Provide OHS costing based on scope and risks, covering PPE, training, first aid, ablutions, safety signs, and campaigns.
• Submit valid COIDA certificate of good standing or proof of application (South African tenderers only).
• Provide signed OHS policy and proof of OHS competency for personnel.
• Safety requirements are for tender evaluation; upon contract award, comply with Arnot Power Station’s safety file requirements.

• Strictly comply with all environmental legislation including Section 24 of Constitution, NEMA, and other relevant laws.
• Adhere to Arnot Power Station’s Environmental Management System (ISO 14001:2015) and Eskom SHEQ Policy, Emergency Preparedness Procedure, Environmental Manual, and Waste Management Procedure.
• Submit CEO/Director-signed commitment to good environmental management practices and legislative compliance.

• Contract conditions: NEC 3 Engineering and Construction Contract with core clauses, main option A (priced contract with activity schedule), dispute resolution option W1, and secondary options X1, X2, X5, X7, X15, X16, X18, X20, and Z.
• Tender validity: 12 weeks from closing date.
• Eligibility restrictions: Tenderers must not be from countries on international sanctions lists, submit more than one tender (except on E-tendering with size limits), have conflicts of interest, be signed by unauthorized persons, restricted by National Treasury or Eskom, or subcontract 100% of the scope.
• Subcontracting with subsidiaries must be declared to avoid fronting allegations.

• Market research indicates an open tender process.

• Closing date: 21 August 2026 at 10:00.
• Project duration: 3 years.

• Business Unit: Arnot Power Station.
• Name of Buyer: Constance Ndhlovu.

• Tenderers must subcontract a minimum of 5% of the contract value to an EME or QSE which is at least 51% owned by black people living in rural or underdeveloped areas or townships.
• Submit mandatory subcontracting returnables: a signed subcontracting agreement with the subcontractor’s company registration documents (CK and B-BBEE certificate or sworn affidavit), OR copies of subcontracting contracts/agreements OR letters of intent to subcontract signed by the tenderer and earmarked subcontractor.
• Suppliers must submit quarterly SDL&I reports to Eskom.
• An SDL&I Implementation Schedule must be completed and returned to the SDL&I representative within 28 days after contract award.
• Failure to meet SDL&I obligations may invoke retention clauses and penalties.

All tenderers eligible, but scoring and award depend on B-BBEE status and price. Tenderers without valid B-BBEE docs can only score out of 80 for price (lose all 10 B-BBEE points). Non-compliance with CIDB CSDG or local content documentation (SBD 6.2, Annex C) renders tender non-responsive. Must meet designated sector local content threshold (90% for electrical cables).

• Scope: Outside Plant MV Switchgear Upgrade at Arnot Power Station.
• Project duration: 3 years.
• CIDB Construction Skills Development Goal (CSDG) applies: Suppliers must match Eskom’s targets of 0.25% for Mechanical Engineering Works and 0.25% for Electrical Engineering Works.
• Failure to meet the mandatory CIDB CSDG percentage will render the tender non-responsive.

• Tenderers may engage SETA-accredited training providers to participate in developing critical and scarce skills.
• Tenderers are responsible for the full cost of skills development for candidates (excluding Eskom employees and registered learners).
• Tenderers are advised to approach relevant SETAs for grants, subsidies, and incentives, and SARS for tax rebates earmarked for skills development.

• Tender responses must separate pricing into components as per the Price Schedule included in the tender documents.
• Local procurement content is calculated as total spending minus the imported component.

• Pricing must be separated into local and imported components as per the Price Schedule.
• Local procurement content is defined as total spending minus the imported component.
• Eskom will retain 2% of every invoice (excluding VAT) as security for SDL&I obligation fulfilment.

• B-BBEE: A valid B-BBEE certificate issued by a SANAS accredited verification agency, or a sworn affidavit/CIPS affidavit, is required to claim preference points. Eskom does not accept sworn affidavits with electronic signatures.
• Proof of ownership/shareholding (preferably CIPC documentation) including a shareholding breakdown must be provided.
• Certified ID copies of shareholders must be submitted.
• Proof of Disability must be provided where applicable.
• Local Content: For designated sectors (Electrical and Telecommunication cables), a 90% local content threshold must be achieved. SBD 6.2 Declaration Form and Annex C (Local Content Declaration-Summary Schedule) are mandatory returnables.
• CIDB: Mandatory CIDB compulsory training applies. Suppliers must match Eskom’s CSDG targets of 0.25% for Mechanical and Electrical Engineering Works.
• B-BBEE Improvement Plan: Tenderers must submit a B-BBEE improvement or retention plan within 30 days of signing the contract. Specific migration milestones are required based on B-BBEE status level at award.
• Subcontracting: Minimum 5% of contract value must be subcontracted to designated EMEs/QSEs.
• Sworn Affidavit Validity: Detailed requirements are provided for the validity of sworn affidavits, including deponent details, enterprise information, revenue, B-BBEE status level, and commissioner of oath rules.

• The Commissioner of Oath cannot be an employee or ex officio of the enterprise, as a person cannot commission a sworn affidavit in which they have an interest.

• Eskom will retain 2% of every invoice (excluding VAT) as security for fulfilling all SDL&I obligations.
• Retained amounts will only be released upon:

• Receipt of SDL&I progress reports from the contractor.
• Fulfilment of all SDL&I obligations by the contractor.
• Submission of an approved compliance report by the SDL&I Department.

• Suppliers must submit quarterly SDL&I reports to Eskom.
• Eskom will review reports within 30 days and notify suppliers in writing if obligations are not met.
• Suppliers must implement corrective measures before the next report if obligations are not met, otherwise retention clauses will be invoked.
• An SDL&I Implementation Schedule must be completed and returned to the SDL&I representative within 28 days after contract award for monitoring and reporting.

• Potential subcontracting/outsourcing scope includes labour, material, and transportation of material.

• Tenderers who fail to provide B-BBEE documentation will score 0 points for specific goals and may only score out of 80 points for price.

Project: Replacement of obsolete MV switchgear at Arnot Power Station.

• Existing switchgear is end-of-life, unsupported, unreliable, and unsafe due to past explosions and non-compliance with arc protection standards.
• New switchgear must comply with internal arc standards, incorporate arc mitigation, and meet current regulatory requirements.
• Full scope includes decommissioning, removal, design, manufacturing, testing, installation, commissioning, and handover.

To avoid disqualification, you must submit the following returnable documents:

• Compliance Declaration.
• Internal arc test certificate.
• Accredited type test certificate and reports.
• Short-circuit withstand certificate.
• Routine test certificate for the supplied panels.
• Fully completed Schedules: 240-9357677_technical schedule AB Arnot PS and 240-56030406 RMU Technical Schedule A&B, and Protection Technical Schedule A and B.
• A list of equipment, components, and technologies offered for switchgear, protection devices, data communication systems, and cabling works.
• Evidence of experience in similar projects: client reference letters, contract award documents, completion or commissioning certificates.
• A letter committing or confirming that major equipment (switchgear, protection devices, data communication) is supplied by the Original Equipment Manufacturer (OEM). If you are not the OEM, provide a written licence agreement with the OEM, valid for the contract duration.
• If type testing lab is not a member of Short-circuit Test Liaison (STL), provide proof of its ISO/IEC 17025 compliance.
• List all type test certificate numbers for the equipment offered.
• Reference list of identical equipment must show projects where technology was used, with client names, country, year, and a minimum of five years since installation.
• Protection devices must be listed in Eskom standard 240-56227586.

Mandatory returnable documents:

• Compliance Declaration.
• Internal arc test certificate.
• Accredited type test certificate and reports.
• Short-circuit withstand certificate.
• Routine test certificate for supplied panels.
• Fully completed Schedules: 240-9357677_technical schedule AB Arnot PS and 240-56030406 RMU Technical Schedule A&B, and Protection Technical Schedule A and B.
• List of equipment, components, and technologies offered for switchgear, protection devices, data communication systems, cabling.
• Evidence of similar project experience: client reference letters, contract award documents, completion or commissioning certificates.
• Letter committing that major equipment is supplied by the OEM; if not, provide OEM licence agreement valid for contract duration.

Mandatory criteria: 1) Submission of all required compliance schedules and documentation. 2) Proof of switchgear compliance with internal arc protection standards (IEC 62271-200). 3) All major equipment must be from the OEM or backed by a license agreement valid for the contract duration. 4) Demonstrated experience with similar projects and technology.

Project: Replacement of outside plant MV switchgear at Arnot Power Station over 3 years.

Scope includes:

• Decommissioning and removal of existing MV switchgear, battery chargers, batteries, associated power and control cables, and extraction fans.
• Relocation of removed equipment to dedicated site areas.
• Design and manufacturing of new MV switchgear.
• Factory acceptance testing (FAT), supply, delivery, offloading, positioning, and installation in outside plant MV switchgear rooms.
• Site acceptance testing (SAT), commissioning, and final handover.

Key technical drivers:

• Existing switchgear is end-of-life, unsupported by OEM, with unreliable protection and past explosion incidents.
• Non-compliant with current internal arc protection standards; lacks arc containment features.
• Obsolete, difficult to maintain, with spare parts unavailable.

New switchgear must:

• Comply with internal arc protection standards (e.g., IEC 62271-200).
• Incorporate advanced arc mitigation systems.
• Align with current regulatory and safety requirements.
• Improve reliability and ensure safe, stable electrical supply.

Referenced standards and documents:

• Eskom standards: 240-56227573, 240-56357424, 240-56030406, 240-56227586.
• Iec 62271-200.
• Works Information/Technical Specification for the project.

Qualitative evaluation includes methodology aspects:

• Proposed design documentation for protection schemes (8% weighting).
• Interface design with C&I system (4% weighting).
• Submission of design drawings as per Works Information (8% weighting).
• Maintenance plan (4% weighting).
• Training as per Works Information (2% weighting).

Bidder experience requirements:

• Provide evidence of experience in projects of similar nature and complexity: client reference letters, contract award documents, completion or commissioning certificates.
• Reference list of identical equipment must indicate projects where the technology was implemented, including client names, country, year, and a minimum of five years since installation.
• Arnot Power Station will verify the evidence provided.

If the type testing laboratory used is not a member of Short-circuit Test Liaison (STL), you must provide proof of the laboratory's compliance with ISO/IEC 17025 requirements.

Mandatory compliance requirements:

• Equipment must comply with type testing requirements, including internal arc tests as per IEC 62271-200 or equivalent standards.
• Submit compliance declaration and all required test certificates.
• Major equipment (switchgear, protection devices, data communication systems, cabling) must be of proven technology.
• Provide evidence of experience in similar projects: client references, contract awards, completion certificates.
• Major equipment must be supplied by the Original Equipment Manufacturer (OEM) or with a valid OEM licence agreement for the contract duration.
• Protection devices must be listed in Eskom standard 240-56227586 (List of approved electronic devices).
• If type testing lab is not an STL member, prove ISO/IEC 17025 compliance.

Note: The document is a Controlled Disclosure tender technical evaluation strategy. It references Eskom procurement policy and generation tender evaluation procedure.

Safety critical issues with existing switchgear:

• Unreliable protection systems and past explosions causing equipment damage.
• Non-compliant with current internal arc standards; lacks arc containment, allowing faults to propagate.
• Difficult to maintain due to obsolescence and spare parts unavailability.

The replacement project will address these to ensure a safe and stable electrical supply with compliant, advanced arc mitigation systems.

The replacement project aims to eliminate obsolescence, improve reliability, and ensure a safe, stable electrical supply. New switchgear must comply with internal arc protection standards and incorporate advanced arc mitigation systems.

Mandatory submission requirements:

• Compliance Declaration, internal arc test certificate, accredited type test certificate and reports, short-circuit withstand certificate, routine test certificate.
• Fully completed schedules: 240-9357677_technical schedule AB Arnot PS and 240-56030406 RMU Technical Schedule A&B, and Protection Technical Schedule A and B.
• List of equipment, components, and technologies offered for switchgear, protection devices, data communication systems, cabling.
• Evidence of similar project experience: client references, contract awards, completion certificates.
• Letter committing that major equipment is supplied by the OEM; if not, provide OEM licence agreement valid for contract duration.
• If type testing lab is not STL member, prove ISO/IEC 17025 compliance.
• List all type test certificate numbers.
• Reference list showing projects where technology was used, with client details and minimum five years since installation.
• Protection devices must be listed in Eskom standard 240-56227586.

This section details the technical evaluation strategy. See the main evaluationCriteria section for structured criteria and scoring.

This document is Eskom's 'List of Approved Electronic Devices to be used on Eskom Power Stations' (Standard 36-726).

• It provides a list of products (e.g., protective IEDs, relays, other electronic devices) approved for installation on Eskom power station electrical plant.
• Its purpose is to guide Eskom engineering teams in product selection for protection, excitation, and measurement systems in new designs or modifications.
• It applies to all Eskom Generation sites.
• The document includes extensive appendices categorising approved devices by function (e.g., generator protection, motor protection).

Suppliers must demonstrate the ability to supply and support equipment from the approved manufacturers listed in the standard's appendices. Technical proposals must align with the device functions and communication protocols specified for each application. Suppliers are responsible for ensuring any proposed device firmware/hardware versions are compatible with the approved versions listed, as per notes in section 3.2.

This document is Eskom's standard list of approved electronic devices for power station electrical plant.

• Purpose: Guides Eskom teams in selecting products (protection, excitation, measurement) for new schemes or modifications.
• Applicability: Applies to all Eskom Generation sites.
• Key References: Must use the latest editions of referenced Eskom standards, including:
• 240-64685228: Generic specification for protective intelligent electronic devices (IEDs).
• 36-726: This list itself.
• Cyber Security Standard for Operational Technology (240-55410927).
• Information Security – IT/OT Remote Access Standard (32-373).
• Device Lists: Approved, not approved, obsolete, and on-hold devices are listed by function in appendices (e.g., Generator Protection, Transformer Protection).
• Type Testing Requirements:
• Tenderers can submit existing type test certificates from independent labs, scrutinised by Eskom.
• Evidence from substantially similar equipment may be accepted.
• Type testing, if required, is at the Tenderer's expense.
• Protective IEDs must be tested per 240-64685228.
• Other electronic devices require a suite of tests (EMC, insulation, environmental) selected based on technology.
• Important Notes:
• Devices supplied may have higher firmware; hardware must be the same as tested.
• Devices on 'On Hold' status may not be used for new designs.
• Criteria for Status Change:
• Devices can be moved to 'On Hold' for issuing incorrect trips, repeated failures, or not aligning with Eskom protection philosophy.
• Devices can return to 'Approved' after re-engineering, firmware updates, or improved documentation.

The document defines quality assurance processes for electronic devices.

• Type Testing: Mandatory for device families; certificates and detailed independent lab reports are required.
• Conformance Evidence: Submitted certification must clearly show conformance to standards.
• Device Status Management:
• Devices can be placed 'On Hold' for performance issues (e.g., incorrect trips, repeated failures), incompatibility with Eskom practices, or poor documentation.
• Devices can be reinstated to 'Approved' after re-engineering, firmware updates, or provision of satisfactory documentation.
• Testing Standards: Specifies detailed test requirements for EMC, insulation resistance, and environmental conditions (vibration, shock, temperature, humidity).
• Reference Documents: Requires adherence to a suite of Eskom specification documents for measurement and metering equipment.

The document specifies technical compliance requirements for electronic devices used on Eskom power stations.

• Approved Devices: Bidders must propose devices listed as 'Pass' or 'Approved' in the relevant appendices.
• Testing Compliance:
• Devices must have passed type testing per the guidelines, or equivalent evidence must be submitted.
• Test reports must be from an independent laboratory and reviewed by a skilled Eskom employee.
• Standards Compliance: All devices must conform to the referenced Eskom standards and international norms (e.g., IEC, ANSI) for EMC, insulation, and environmental tests.
• Documentation: Operation manuals and documentation for devices must be clear and understood by Eskom staff.
• Status Adherence: Devices listed as 'On Hold', 'Fail', or 'Not Approved' should not be proposed for new schemes.

The document specifies environmental testing requirements for electronic devices.

• Tests must be performed according to international standards (IEC).
• Environmental Test Requirements include:
• Vibration tests (sinusoidal) per IEC60255-21-1, Class 1.
• Shock and bump test per IEC60255-21-1, Class 1.
• Seismic test per IEC60255-21-3, Class 1.
• Cold test: Operate with tolerance at -10°C (LCD screen operative) per IEC60068-2-1.
• Dry heat test: Operate with tolerance at +55°C per IEC60068-2-2.
• Cyclic temperature and humidity test per IEC60068-2-30 (25°C/95% RH to 55°C/95% RH, 12+12 hour cycle).

• This document outlines Eskom's Life-Saving Rules, a set of safety standards to enforce zero tolerance for at-risk behaviours.
• The rules are designed to prevent serious injuries and fatalities and apply to all Eskom employees, agents, consultants, and contractors at all Eskom sites.
• The standard clarifies the six most prominent causes of serious incidents within Eskom.

• Closing date: 13 February 2025.

To be eligible to work on Eskom sites, a contractor must: 1. Formally integrate these Life-Saving Rules into their site safety management system. 2. Have a documented process for training all site personnel on these rules and obtaining signed acknowledgements. 3. Have a compliant disciplinary process to address violations within 5 working days. 4. Ensure all operational procedures align with the extensive referenced normative documents (e.g., Plant Safety Regulations, High Voltage Operating Regulations, Working at Heights Standard).

• The work must comply with Eskom's Life-Saving Rules, which apply to all contractors.
• The six Life-Saving Rules are:

1. OPEN, ISOLATE, TEST, EARTH AND CREATE AN EQUIPOTENTIAL ZONE BEFORE TOUCH: No electrical work may be performed unless the worker is trained, authorised, has a valid permit, conducts a pre-task risk assessment, follows specific safety procedures, works within an equipotential zone (for medium/high voltage), and wears appropriate PPE.
2. HOOK UP AT HEIGHT: No work at height may be performed unless a Fall Protection Plan is developed, the worker is medically fit and trained, a specific risk assessment is conducted, and an Eskom-approved fall arrest system is used.
3. BUCKLE UP: Seat belts are mandatory for all vehicle occupants at all times on Eskom business.
4. BE SOBER: No person under the influence of alcohol or drugs is permitted on site or to conduct Eskom business.
5. ENSURE THAT YOU HAVE A PERMIT TO WORK: A valid Permit to Work (PTW) is required, governed by Plant Safety Regulations, Operating Regulations for High Voltage Systems, Low Voltage Operating Regulations, or other applicable permit systems.
6. ENSURE SAFE LIVE WORKING: Live workers must adhere to basic principles, maintain minimum approach distances, only perform live work (no mixing with dead work), and only perform authorised tasks documented in the respective Task Manual.

• Contractors must ensure all employees are trained, competent, and authorised for tasks.
• Violation of Life-Saving Rules is treated as serious misconduct with zero tolerance, leading to disciplinary action and potential suspension of contractor activities.

• For live work, the contractor's methodology must ensure all basic live work principles are adhered to as per the relevant High Voltage Live Working Standard.
• Workers must observe and maintain the minimum approach distance (MAD).
• Live work and dead work must not be mixed on the same site at the same time.

• Compliance with the Life-Saving Rules standard will be monitored through annual audit and inspection plans.

• Contractors must comply with the Occupational Health and Safety Act.
• Contractors must adhere to Eskom's Contractor Health and Safety Requirements (document 32-136).
• Compliance with ISO 45001 Occupational Health and Safety Management Systems is referenced.
• Contractors are defined broadly and include all entities performing work for Eskom.

• Contractors must fully comply with Eskom's Life-Saving Rules and all referenced health and safety documents, including the Occupational Health and Safety Act, ISO 45001, and specific Eskom procedures for contractor safety, working at heights, substance abuse, incident management, and personal protective equipment.
• A contractor is defined as any employer formally contracted by Eskom to perform work or supply services, products, or equipment.
• Violation of a Life-Saving Rule will result in a disciplinary process. Eskom has a zero-tolerance stance and may suspend a contractor's activities. The contractor must remove the violating employee from site and initiate disciplinary proceedings within five working days.

• The tender evaluation will consider adherence to ISO 9001 Quality Management Systems.
• The Safety, Health, Environment and Quality Policy (document 32-727) will be a reference point.