11 kV Indoor Switchgear - SCADA Controlled · 11 kV Indoor Switchgear - SCADA Controlled T HR EL...

11 kV Indoor Switchgear - SCADA Controlled

T HR EL 01001 SP

Specification

Version 1.0

Issued Date: 16 September 2014

Important Warning

This document is one of a set of standards developed solely and specifically for use on the rail network owned or managed by the NSW

Government and its agencies. It is not suitable for any other purpose. You must not use or adapt it or rely upon it in any way unless you

are authorised in writing to do so by a relevant NSW Government agency.

If this document forms part of a contract with, or is a condition of approval by, a NSW Government agency, use of the document is

subject to the terms of the contract or approval.

This document may not be current. Current standards are available for download from the Asset Standards Authority website at

www.asa.transport.nsw.gov.au.

© State of NSW through Transport for NSW

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Standard governance

Owner: Lead Electrical Engineer, Asset Standards Authority

Authoriser: Chief Engineer Rail, Asset Standards Authority

Approver: Director, Asset Standards Authority on behalf of ASA Configuration Control Board

Document history

Version Summary of change 1.0 First issue

For queries regarding this document,

please email the ASA at

[email protected]

or visit www.asa.transport.nsw.gov.au

© State of NSW through Transport for NSW

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© State of NSW through Transport for NSW of 59

Preface The Asset Standards Authority (ASA) is an independent unit within Transport for NSW (TfNSW)

and is the network design and standards authority for defined NSW transport assets.

The ASA is responsible for developing engineering governance frameworks to support industry

delivery in the assurance of design, safety, integrity, construction, and commissioning of

transport assets for the whole asset life cycle. In order to achieve this, the ASA effectively

discharges obligations as the authority for various technical, process, and planning matters

across the asset life cycle.

The ASA collaborates with industry using stakeholder engagement activities to assist in

achieving its mission. These activities help align the ASA to broader government expectations of

making it clearer, simpler, and more attractive to do business within the NSW transport industry,

allowing the supply chain to deliver safe, efficient, and competent transport services.

The ASA develops, maintains, controls, and publishes a suite of standards and other

documentation for transport assets of TfNSW. Further, the ASA ensures that these standards

are performance based to create opportunities for innovation and improve access to a broader

competitive supply chain.

This standard has been updated from RailCorp document EP 01 00 00 02 SP 11kV AC Indoor

SCADA Controlled Switchgear Fitted with Stationary (Non-Withdrawable) Switching Devices.

This RailCorp document is withdrawn with the publication of this specification.

This document is a first issue.

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Table of contents 1. Introduction............................................................................................................................................6 2. Purpose...................................................................................................................................................6 2.1. Scope ..................................................................................................................................................................... 6 2.2. Application............................................................................................................................................................. 6 3. Reference documents ...........................................................................................................................6 4. Terms and definitions ...........................................................................................................................8 5. Functional requirements of 11 kV indoor switchgear........................................................................9 6. Switchboard requirements .................................................................................................................10 6.1. Circuit breaker specific ratings.......................................................................................................................... 12 6.2. Busbar inter-panel partition ............................................................................................................................... 13 6.3. Busbar earthing facility ...................................................................................................................................... 13 6.4. Switchboard extension ....................................................................................................................................... 13 7. Earthing bar..........................................................................................................................................14 7.1. Transient earth clamp......................................................................................................................................... 14 8. Current transformers for circuit breaker...........................................................................................15 8.1. Current transformer rating plate ........................................................................................................................ 15 9. Voltage transformers for switchboards ............................................................................................15 10. Low voltage cabinet for secondary equipment ................................................................................16 11. Circuit breakers....................................................................................................................................16 11.1. Circuit breaker interrupters................................................................................................................................ 16 11.2. Circuit breaker operating mechanisms ............................................................................................................. 17 11.3. Circuit breaker indications ................................................................................................................................. 18 12. Switchgear auxiliary equipment.........................................................................................................18 13. Interlocks ..............................................................................................................................................19 13.1. Mechanical interlocks ......................................................................................................................................... 20 14. Circuit breaker and switch panel HV cable compartment ...............................................................20 14.1. Fully insulated cable terminations..................................................................................................................... 21 14.2. Non-fully insulated cable terminations ............................................................................................................. 21 14.3. Cable compartment size ..................................................................................................................................... 21 15. Surge arresters for 11 kV switchboards............................................................................................22 16. Circuit earthing facilities.....................................................................................................................22 17. Voltage detecting system ...................................................................................................................23 18. Circuit test facilities.............................................................................................................................23 19. Padlocking............................................................................................................................................23 20. Floor fixing and penetration details...................................................................................................24 21. Segregation of LV wiring in HV compartment ..................................................................................24 22. Instruments, transducers and metering............................................................................................24 22.1. Current transducers............................................................................................................................................ 24 22.2. Voltage transducers............................................................................................................................................ 25 22.3. Ammeters............................................................................................................................................................. 25 22.4. Voltmeters............................................................................................................................................................ 25 22.5. Watthour meter.................................................................................................................................................... 25

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23. Busbar and circuit protection.............................................................................................................25 23.1. High impedance bus zone protection................................................................................................................ 26 23.2. Internal arc fault detection scheme ................................................................................................................... 26 23.3. Feeder protection................................................................................................................................................ 26 23.4. System transformer protection.......................................................................................................................... 26 23.5. Distribution transformer protection................................................................................................................... 26 24. SCADA indications and controls .......................................................................................................27 24.1. Binary indication and ACCB control ................................................................................................................. 27 24.2. Analogue indication ............................................................................................................................................ 27 24.3. Controls ............................................................................................................................................................... 28 Appendix A - Switchboard configurations...................................................................................................29 A.1 Switchboard configurations ...............................................................................................................29 A.1.1 Switchboard panel configuration codes ........................................................................................................... 29 A.1.2 Bus coupling circuit breaker.............................................................................................................................. 31 A.1.3 Capacitor/harmonic filter circuit breaker .......................................................................................................... 31 A.1.4 Feeder circuit breaker (non Auto)...................................................................................................................... 33 A.1.5 Feeder network switch (supervisory indication only)...................................................................................... 33 Appendix B - Typical switchboard configurations......................................................................................34 B.1 Supply point switchboard configurations.........................................................................................34 B.2 Switching station switchboard configurations.................................................................................34 B.3 System substation switchboard configurations ..............................................................................34 B.4 Mid point switching switchboard configuration...............................................................................35 B.5 Bus coupled circuit breaker switchboard .........................................................................................35 B.6 Example switchboard configurations................................................................................................35 Appendix C - Integrated system support requirements .............................................................................46 C.1 Integrated support objectives ............................................................................................................46 C.2 Equipment supplier deliverable .........................................................................................................46 Appendix D - Tests .........................................................................................................................................47 D.1 Routine tests ........................................................................................................................................47 D.2 Type tests .............................................................................................................................................47 Appendix E - Data set associated with the equipment ...............................................................................48 E.1 Information ...........................................................................................................................................48 E.2 Technical schedule..............................................................................................................................48 E.3 Life cycle costing.................................................................................................................................48 Appendix F - Technical schedule..................................................................................................................49 Appendix G - Guide to information requirements for Request for Tender...............................................58

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1. Introduction This document details the requirements for indoor 11 kV non-withdrawable SCADA controlled

switchgear for use in the RailCorp distribution system.

All information required to ensure that the switchgear is electrically suitable for the RailCorp

network is contained in this document or referenced by this document.

2. Purpose The purpose of this document is to specify the requirements for 11 kV non-withdrawable

SCADA controlled switchgear to enable suitable equipment to be procured for use in the

RailCorp network.

2.1. Scope This document provides the specifications of factory assembled, type tested, metal enclosed,

single busbar, fixed (stationary) switching devices designed for indoor installation on railway

distribution systems operating at nominal 11 kV ac, three-phase, 50 Hz.

The switchgear panels include equipment that comprises of a fixed functional unit with an

associated off-load disconnector and interlocked earthing facility, in combination with the

associated SCADA control, measuring, indicating, alarm and protective equipment, including

interconnections, accessories, enclosures and supporting structure.

2.2. Application The requirements of this document apply to purchase or installation of a new 11 kV indoor

switchboard in a RailCorp substation. These requirements are applicable from the date of issue

of this specification.

The requirements of this document are not applicable to existing 11 kV indoor switchboards

currently in service in the RailCorp network.

3. Reference documents International standards

IEC 61243-5 Voltage detection systems

Australian standards

AS 1852.441:1985 International electrotechnical vocabulary - Switchgear, controlgear and fuses

AS 1931.1:1996 High-voltage test techniques - General definitions and test requirements

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AS 2067:2008 Substations and high voltage installations exceeding 1 kV ac

AS 2629:2008 Separable insulated connectors for power distribution systems above 1 kV

AS 2700:2011 Colour standards for general purposes

AS 3760:2010 In-service safety inspection and testing of electrical equipment

AS 60044.1:2007 Instrument transformers - Current transformers

AS 60044.2:2007 Instrument transformers – Inductive voltage transformers

AS 60137:2008 Insulated bushings for alternating voltages above 1000 V

AS 60265.1:2001 High-voltage switches - Switches for rated voltages above 1 kV and less than

52 kV

AS 60270:2001 High-voltage test techniques – Partial discharge measurements

AS 60417(all parts) Graphical symbols for use on equipment (identical to IEC 60417)

AS 60529:2004 Degrees of protection provided by enclosures (IP Code)

AS 62271.1:2012 High-Voltage switchgear and controlgear - Common specifications

AS 62271.100:2008 High-voltage switchgear and controlgear - High voltage alternating-current

circuit breakers

AS 62271.102:2005 High-voltage switchgear and controlgear - Alternating current

disconnectors (isolators) and earthing switches

AS 62271.200:2005 High-voltage switchgear and control gear – A.C. metal enclosed switchgear

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

AS 62271.301:2005 High voltage switchgear and control gear - Dimensional standardardization

of terminals

Transport for NSW standards

Several significant sets of requirements applicable to 11 kV ac indoor, supervisory controlled

switchgear are common to other classes of equipment and are set out in the following TfNSW

standards.

The equipment shall comply with the relevant requirements set out therein.

T HR EL 00002 PR Electrical Power Equipment - Integrated Support Requirements

T HR EL 00003 SP Common Requirements for Electric Power Equipment

EP 00 00 00 13 SP Electrical Power Equipment - Design Ranges of Ambient Conditions

EP 19 00 00 02 SP Protection System Requirements for the High Voltage Network

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EP 21 00 00 01 SP Insulation Coordination and Surge Arrester Selection

EP 90 10 00 02 SP Standard Voltage Tolerances

4. Terms and definitions The following terms and definitions apply in this document:

ACCB alternating current circuit breaker

ASA Asset Standards Authority

CT current transformer

MTM protection relay for the multi-tripping of ACCBs

This is a manually reset relay with a hand reset flag.

NER neutral earthing resistor

RTU remote terminal unit

SCADA supervisory controlled and data acquisition system

TfNSW Transport for New South Wales

UGOH underground to overhead (aerial line)

VDS voltage detection system

VPIS voltage presence indicating system

VT voltage transformer

For the purpose of this specification, the terms and definitions in AS 1852.441 and the following

apply:

circuit breaker a mechanical switching device that is capable of making, carrying and breaking

currents under normal circuit conditions, and also of making, carrying for a specified time and

breaking currents under specified abnormal conditions, such as those of a short-circuit

circuit breaker panel a switchgear panel complete with a fixed circuit breaker,

switch-disconnector, earthing switch and protection and control equipment

earthing switch as defined in AS 1852(441) 441-14-11

fixed circuit breaker a circuit breaker which is not a withdrawable part of the panel assembly in

which it is mounted

metal enclosed switchgear and controlgear switchgear and controlgear assemblies with an

external metal enclosure intended to be earthed and completely assembled, except for external

connections

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non-withdrawable switchgear switchgear such as circuit breaker and switches, which are not

a withdrawable part of the panel assembly in which they are mounted

rated insulation level the combinations of the rated lightning impulse withstand voltage and the

rated short duration power frequency withstand voltage specified in AS 2650

rated normal current for main circuits and switching devices, the rms value of the current that

they are designed to carry continuously under the specified conditions of use and behaviour

rated peak withstand current for main and earthing circuits, the peak current associated with

the first major loop of the short-time withstand current that a mechanical switching device is

designed to carry in the closed position under prescribed conditions of use and behaviour

rated short-time withstand current for main and earthing circuits, the rms value of current that

the switching device is designed to carry in the closed position during a specified short time

under prescribed conditions of use and behaviour

rated voltage the highest rms phase-to-phase voltage of the supply on which the switchgear is

designed to operate

switch a mechanical switching device that is capable of making, carrying and breaking currents

under normal circuit conditions, which can include specified operating overload conditions, and

also capable of carrying for a specified time, currents under specified abnormal circuit

conditions such as those of a short-circuit

switchboard two or more switchgear panels coupled together in various combinations

switch-disconnector as defined in AS 1852(441) 441-14-12

switchgear a general term that covers switching devices and their combination with associated

control, measuring, indicating, alarm, protective and regulating equipment, also assemblies of

such devices and equipment with associated interconnections, accessories, enclosures and

supporting structures, intended, in principle, for use in connection with the generation,

transmission, distribution and conversion of electric energy

5. Functional requirements of 11 kV indoor switchgear The 11 kV indoor switchgear shall consist of 11 kV busbar, fixed type circuit breakers,

disconnectors and associated control and protection equipment.

The 11 kV indoor switchgear shall provide for the following:

x connection of 11 kV feeders, bus tie cables, system transformer and distribution

transformer circuits to the 11 kV busbar

x isolation and earthing of feeders, bus tie cables, system transformer and distribution

transformer circuits

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x protection and SCADA control for 11 kV feeders, system transformer and distribution

transformer circuits and sections on the 11 kV busbar

x connection, protection and SCADA control of 11 kV harmonic filter or capacitor banks

x means to perform a dc test on the HV cables, without disturbing existing HV cable

connections

6. Switchboard requirements Table 1 provides details of general requirements of a switchboard for 11 kV indoor switchgear.

Table 1 - Switchboard general requirements

Parameter Designation

Switchboard type Metal enclosed

Class Indoor

Method of neutral earthing of the system Effectively earthed and non-effectively earthed

Main device type Non-withdrawable (stationary)

Busbar insulation medium Cast resin or air

IP rating IP3X

Possible extension to switchboard Both sides

The switchboard shall be designed and manufactured in accordance with the standards stated

in Table 2 and Table 3 along with the specific class and classification.

Table 2 - Switchboard standards

Equipment Standard

Switchgear (common specifications)

Metal enclosed switchgear

AS 62271.1

AS 62271.200

Current transformer AS 60044.1

Voltage transformer AS 60044.2

Degrees of protection provided by enclosure (IP

code)

AS 60529

General AS 2067

Switchgear status indicators

(definite indication of position)

AS 62271.102 Appendix A

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Table 3 - Switchboard standards with class

Designation Standard Class

Service conditions AS 62271.1 Normal (except for temperature which

shall comply with EP 00 00 00 13 SP)

Refer to note 1.

Partition class AS 62271.200 PI

Internal arc classification (IAC) AS 62271.200 AFLR

Earthing switch AS 62271.102 E2

Disconnector AS 62271.102 M2

Switch AS 60265 - 1 M1, E3

Circuit breaker (except

capacitor)

Capacitor switching

AS 62271.100

AS 62271.100

M2, E2, C1

M2, E2, C1

Note 1: Where the switchgear does not meet the temperature requirements of

EP 00 00 00 13 SP, then the applicable derating factors shall be provided.

Table 4 details switchboard and specific equipment rating requirements.

Table 4 – Switchboard common ratings

Parameter Rating

Number of phases 3

Rated system voltage (Ur) 12 kV (minimum)

Rated frequency (fr) 50 Hz

Busbar

Rated normal current

Single

630 A or 1250 A Refer note 1.

Rated lightning impulse withstand voltage (Up)

Common value

Across the isolating distance

95 kV (peak) Refer note 2.

110 kV (peak)

Rated short-duration power-frequency withstand

voltage (Ud)

Common value

Across the isolating distance

28 kV (rms)

32 kV (rms)

Rated short time withstand current (Ik)

(for main and earthing circuits)

16 kA (rms)

Rated peak withstand current (Ip)


40 kA (peak)

Rated duration of short circuit (tk)


1 sec

Internal arc classification (IAC)

Arc test current

Arc test current duration

AFLR

16 kA

1 sec

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Parameter Rating

Rated supply voltage of closing and opening

devices and of auxiliary and control circuits (Ua)

Refer to note 3.

Option 1 – 125 V dc


Partial discharge level of complete switchboard

including all components

< 50 pC

Note 1: The required busbar rating for a particular location is specified on the

approved proposed operating diagram provided at the time of order.

Note 2: The rated lightning impulse withstand voltages mentioned are specific to

Australian conditions and compatibility with the existing RailCorp network. These

values are not from the current version of AS62271.1.

Note 3: Auxiliary voltage will be nominated at time of order of switchboard. These

requirements are specified in T HR EL 00003 ST, Common Requirements for Electric

Power Equipment.

6.1. Circuit breaker specific ratings Table 5 and Table 6 provide details of specific ratings for the circuit breakers.

Table 5 – ACCB Common Ratings -1

Parameter (common to all ACCBs) Rating

Rated supply voltage of closing and opening

devices and of auxiliary and control circuits (Ua)

Refer to note 1.



Rated normal current (Ir)2 - Bus Tie

Refer to note 2.

Option 1 – 630 A

Option 2 – 1250 A

Feeder ≥400 A

System transformer ≥630 A

Distribution transformer ≥200 A

Capacitor/harmonic filter ≥400 A

Rated short circuit breaking current (Isc) 16 kA

Rated duration of short circuit (tk) 1 sec

Interrupter type Vacuum

Number of trip coils 2 independently operated coils

Number of close coils 1

Breaking time < 60 msec (max)

Command response time both ON and OFF < 25 msec (max)

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Parameter (common to all ACCBs) Rating

Rated operating sequence O - 0.3s-CO-3min-CO

Cables connected Bottom front or rear and optional

top

Table 6 - ACCB Common Ratings -2

Parameter (applicable to capacitor ACCB) Rating

Rated short-duration withstand voltage (across the

isolating distance) (Ud)

12 kV ac rms with 13.5 kV dc

offset

Note 1: Auxiliary voltage will be nominated at time of order of switchboard. These

requirements are specified in T HR EL 00003 ST Common Requirements for Electric

Power Equipment.

Note 2: The current ratings for the switchboard are mentioned in the proposed

electrical operating diagram, provided at the time of order.

The requirements specified in this document ensure that the switchboards will fully integrate into

the RailCorp network in terms of operability, maintainability and technical compatibility.

6.2. Busbar inter-panel partition The switchboard shall be designed to have a partition between panels in the busbar

compartment. This is required to contain an electrical fault associated with the busbar to the

panel where the fault originated.

6.3. Busbar earthing facility If any part of the busbar requires routine maintenance then busbar earthing facilities shall be

provided.

6.4. Switchboard extension The switchboard and associated functional units shall be designed so that an extension to an

existing switchboard is possible at both ends with minimal dismantling to the existing

switchboard.

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7. Earthing bar Each switchgear panel shall include two copper earthing bars, rated for maximum fault levels

and not less than 120 mm² cross section area to facilitate earthing.

To assist with stray current mitigation measures from the dc traction system, it may be

necessary to connect 11 kV cable screens to a separate cable screen earth bar on feeder

panels only. This arrangement is to facilitate future installation of a transient earth clamp.

The cable screen earth bar shall be connected to the switchboard earth bar via removable links

and shall be isolated from similar bars in adjacent panels.

The cable screen earth bar shall be insulated from the frame of the switchboard by insulated

mounts that have been rated for maximum earth potential rise and tested for at least 11/√3 kV

for 1 minute.

The cable screen earth bar shall provide for connection of the removable link, three HV cable

screens and two cable connections holes for a transient earth clamp.

The switchboard earth bar shall interconnect adjacent switchgear panels and provide the

following:

x switchgear bonding

x two cable connections to the main substation earth grid

x a removable link per feeder panel for connection to the insulated earth screen earthing bar

x three cable screens for panels other than feeders

x requirements for circuit test facility

Earth termination requirements are provided in T HR EL 00003 ST.

7.1. Transient earth clamp The transient clamp acts as a dc decoupler to provide dc isolation between earthing points that

are still ac connected. Under an ac earth fault the clamp impedance momentarily changes state

to a virtual short circuit, acting to provide a direct connection of HV cable screens to the

switchboard earth bar. The transient earth clamp blocks the path to dc stray current that may

otherwise flow via the cable screen.

Transient earth clamps (if required) are installed on feeder panels only.

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8. Current transformers for circuit breaker The circuit breaker panels shall be provided with protection and metering current transformers in

compliance with EP 19 00 00 02 SP Protection System Requirements for the High Voltage

Network.

The typical quantity of CTs required is as follows:

x feeder panel: 4 (BZ, PW, OC, metering)

x transformer panel: 4 (BZ, Tx diff, OC, metering)

x bus-tie panel: 2 (BZ, bus-tie cable protection)

Where an alternative busbar scheme (such as arc detection) is installed then a CT for BZ will

not be required.

Refer to Appendix B for further detail on typical CT ratio and class.

Specific CT requirements for individual switchboards will be provided in the protection concept

report for individual switchboards which is issued at the time of order.

8.1. Current transformer rating plate A rating plate shall be fitted to each current transformer. A second identical plate shall be fixed

within the LV compartment in a position that facilitates ease of access to read the information.

9. Voltage transformers for switchboards A three-phase voltage transformer or three single phase voltage transformers in compliance

with EP 19 00 00 02 SP shall be provided for each switchboard. A voltage transformer (VT) is

required for each busbar and incoming supply transformer ACCB.

Specific VT requirements for individual switchboards will be provided in the approved protection

concept report which is issued at the time of order.

For the maintenance and commissioning of protection relays, voltage conditions that would

occur during earth faults shall be simulated and the supplier shall explain how this is achieved.

The VT alarm, protection relay VT supply alarm and phase failure relay shall be in accordance

with EP 19 00 00 02 SP.

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10. Low voltage cabinet for secondary equipment The secondary equipment including protective relays, controls, transducers, metering and other

systems shall be housed in a low voltage cabinet located on the relevant circuit breaker panel.

The location of the panel shall be suitable to enable the installation of all secondary wiring and

accessibility for terminating wiring, programming of protection relays and general testing and

commissioning activities.

The low voltage panel shall be a lockable, closed, fully shrouded and arc resistant cabinet of

IP3X standard suitable for accommodating digital protection relays, test blocks, panel meters

and other secondary equipment for control and measurement. Where it is appropriate,

equipment may be mounted on a torsion resistant panel door.

The cabinet shall be fitted with a removable gland plate, cable ducting and terminals. The layout

within the cabinet shall ensure for the following:

x adequate room is provided for the termination of multi-core control cables, dc auxiliary

supply cables and other miscellaneous cables that are required for interfacing with

equipment within the substation

x cable terminals shall be readily accessible to enable connection of test equipment

associated with protection relay testing and commissioning

x cable ducting within the cabinet shall be located to allow for the installation of multi-core

control cables

In particular, adequate room between duct and cable entry points to allow for the bending

radius of cables

x internal cabinet colour shall be white

Refer to T HR EL 00003 ST for details on low voltage wiring, terminals and labelling

requirements.

Mechanical drive elements shall not be installed in the low voltage cabinet.

11. Circuit breakers Circuit breaker panels shall comprise of a fixed circuit breaker, switch-disconnector and earthing

switch and shall have specific ratings as specified in Table 5 and Table 6.

11.1. Circuit breaker interrupters Interrupters shall be capable of at least 10,000 operations at rated current and at least 50

operations at rated short circuit breaking current.

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The contacts of the interrupter shall be held open by a positive fail-safe device independent of

interrupter vacuum. The closing arrangement shall be designed to give a positive closing action

while overcoming the contact hold open device.

11.2. Circuit breaker operating mechanisms The circuit breaker operating mechanism shall be an integral part of the circuit breaker.

The circuit breaker busbar isolator and associated earth switch shall be actuated mechanically.

Auxiliary switches shall provide indication of each switch position.

Any part of the circuit breaker mechanism that requires routine inspection and maintenance

shall not be enclosed in any gas tight compartment.

All circuit breaker operating mechanisms shall be the stored energy type by means of energy

stored in a motor-charged spring with manual and electrical release.

Solenoid based mechanisms shall not be used.

Magnetic actuator type operating mechanisms will be considered, provided that full technical

details of the proposed arrangement are supplied. Typical details shall include principle of

operation, auxiliary power supply requirements, details on manual operation and how the

requirement for duplicate trip coils is addressed. The suitability of existing dc battery and

associated dc circuit wiring shall require assessment in existing locations.

11.2.1. Circuit breaker closing mechanism The circuit breaker closing mechanism shall be electrically operated, trip-free. The circuit

breaker mechanism shall provide lockout that prevents closing, as specified in

Section 441 14 23 of AS 1852 (441): 1985.

All circuit breakers in the closed position shall be able to trip-close-trip before the spring needs

to be charged again.

11.2.2. Circuit breaker operation and control The circuit breakers shall be arranged for operation by local control and by remote supervisory

control. Refer to Section 24.3 for further details.

The circuit breaker shall close without delay when the close command signal is applied. While

this command signal is applied, the circuit breaker shall not make a second attempt to close if it

fails to close on the first attempt.

The circuit breaker shall open without delay when the open command signal is applied

independently to any of the trip coils or to all trip coils simultaneously.

A mechanical push-button or similar device for tripping the circuit breaker shall be provided.

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Continuously rated control equipment shall be provided to make the successful closing of the

circuit breaker independent of the length of time that the control switch is held in the CLOSE

position. This shall ensure that only one closing attempt can be made if the control switch is

held in the CLOSE position.

11.2.3. Circuit breaker auxiliary contacts A minimum of two normally open and two normally closed auxiliary switches rated at 5 amperes

in a 125 V dc inductive circuit or a 415 V ac circuit shall be provided. These auxiliary switches

shall be provided in addition to those essential to the circuit breaker operation.

11.3. Circuit breaker indications The circuit breaker and switch panel shall have indications clearly visible from the front of the

panel (that is, either on the circuit breaker or on the circuit breaker panel).

The circuit breaker / switchgear panel shall have the following definite indications:

x circuit breaker open/close

This shall be implemented by a mechanically operated indicator, indelibly marked, to show

whether the circuit breaker is open or closed. The word OPEN shall be visible only if the

circuit breaker is open and the word CLOSED shall be visible only if the circuit breaker is

closed. If colours are used in addition, then the colour green shall indicate the open

condition and the colour red shall indicate the closed condition.

x switch disconnector open/close (if applicable)

This shall be implemented by a mechanically operated indicator.

x earth switch position

This shall be implemented by a mechanically operated indicator.

x stored energy device charged/discharged

x non-resettable operation counter (nominally mechanical)

However, alternatives shall be accepted after if approved by ASA.

12. Switchgear auxiliary equipment Each switchgear panel shall be fitted with a control panel with the following:

x a local CLOSE and OPEN switch or push-buttons coloured red and green respectively

x LOCAL – REMOTE (SUPERVISORY) changeover switch

x electrically operated indicating lights of the LED type

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x a set of terminals for the termination of auxiliary wiring

All auxiliary wiring for remote closing and tripping circuits, incoming dc control supplies and

all spare auxiliary switches shall be connected to these terminals

This control panel shall have the capability for installing instruments to measure voltage, current

and energy. The requirement for which instruments are to be installed will be specified at the

time of order.

The requirements of any instrumentation to be fitted are set out in Section 22.

Each switchboard shall be fitted with a voltmeter and associated phase selection switch to

indicate the bus voltage.

Anti-condensation heaters where required shall be provided.

13. Interlocks Interlocking requirements regarding operating lever actuation shall be designed to interrogation

interlock principles. Operating levers can only be inserted or actuating forces may only act on

the components if this is permitted by the appropriate operating condition of the associated

functional unit.

Digital switchgear interlock units are not accepted.

Actuating levers shall remove or insert in clearly defined positions 'Close' or 'Open'.

The interlocking shall comply with the following conditions:

x interlock between busbar isolator and outgoing earthing switch

x interlock between busbar isolator and circuit breaker

x interlock between the switch disconnector and the outgoing earthing switch

x interlock between the cable compartment cover and the outgoing earthing switch

For cable testing, specific equipment shall be provided to eliminate the outgoing earth.

Interlocks shall ensure that the disconnector cannot be moved or operated unless the circuit

breaker is open.

Interlocks shall ensure that the circuit breaker cannot be closed unless the disconnector is fully

in the 'closed', 'isolated' or 'earth' position.

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13.1. Mechanical interlocks Facilities provided for operational access to parts of the switchgear panel that contain live

components shall be mechanically interlocked. Access to such parts is not possible unless all

live parts have been rendered safe, either by a visibly applied earth connection or by positively

disconnected and screened from the remaining live parts.

Mechanical interlocks shall be provided to ensure positive and substantial protection against

malfunction.

Mechanical interlocks shall be designed and constructed to ensure dependable fail-safe

operation.

Positive mechanical interlocking shall be provided to prevent inadvertent switching from the ON

position to the EARTH position without a definite stop in the OFF position, or from the EARTH

position to the ON position without a definite stop in the OFF position.

Access to the test terminals shall only be possible when the associated earth switch is in the

EARTH position.

When the circuit test facility is in use, the disconnection shall not be able to close.

The operator shall directly observe the making of the contacts in the circuit EARTH position.

If the earthing of a circuit is not visible, the corresponding indication shall be directly coupled to

the earthing mechanism to ensure fail-safe indication.

If the switchgear panel is designed in a way that the circuit to be earthed is earthed through the

main contacts of the circuit breaker, then the circuit breaker shall be interlocked. This is done so

that it cannot be tripped by the protection relays or SCADA control while the circuit is earthed.

An analysis shall be provided detailing the integrity of the interlocking system. The analysis shall

include all possible failure modes and the controls employed to prevent an unsafe operation.

A table shall be provided of all possible and inhibited states the switchgear may occupy.

14. Circuit breaker and switch panel HV cable compartment Each circuit breaker and switch panel shall be equipped with an 11 kV cable compartment

interlocked with the ACCB for connection of the 11 kV cables.

Due to the variety in physical configurations of existing substations in the RailCorp network

there is the requirement for two separate options for access to the high voltage cable

terminations.

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The two options are as follows:

x access to the high voltage cables from the front

x access to the high voltage cables from the rear

The cable bushings shall be arranged side by side facing the front of the switchboard. Bushings

shall be positioned to suit connection of three core cables with tails of equal length to facilitate

phase transposition without re-terminating the cable.

All cable compartments shall be adequately sealed to prevent entry of vermin and dust in

compliance with IP3X.

Each circuit breaker and switch panel shall provide the means to perform a dc cable test on the

HV cables, without disturbing existing HV cable connections.

14.1. Fully insulated cable terminations All cable termination compartments shall be suitable for dead-break, separable, fully insulated

and shielded system for connection of HV cables. The separable, insulated, shielded

connection system shall comply with AS 2629 (or equivalent IEC, EN) and relevant ratings

specified in Section 6.

14.2. Non-fully insulated cable terminations All cable termination compartments shall be suitable for air insulated termination. The

compartment shall have at a minimum the clearances specified in AS 2067.

To provide protection against flashover due to rodents or high humidity, removable and

re-installable elastomeric insulating boots (or approved alternative) shall be fitted.

14.3. Cable compartment size The cable compartment shall accept single, three-conductor belted or three core dry type cables

including separately lead sheathed paper or XLPE insulated cables of up to 240 mm² in size.

Where three phase cables are to be terminated the dimension of the cable compartment shall

enable adequate clearances for crossing of cable cores.

All cable compartments shall be of dimensions such that full standard cable withstand power

frequency tests as specified in AS 62271.1 can be conducted after cable termination is

complete.

The minimum of one cable shall be achieved without sacrificing space for surge arrester

equipment if required.

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Where the cable compartment design results in a length of unsupported cable greater than the

length recommended by cable manufacturers, then a method of cable support is required within

the compartment.

The standard cable compartment requirement is for bottom entry of cables. A limited

requirement for top entry of cables applies. Details of the cable connections options shall be

nominated in the technical schedule provided in Appendix F.

15. Surge arresters for 11 kV switchboards Surge arresters are not normally required in 11 kV switchboards installed on the RailCorp

network. This is valid for the standard connection arrangement where the feeder consists of

cable to a pole and the 11 kV surge arrester is located on that pole as part of the standard

UGOH (underground to overhead - aerial) arrangement.

16. Circuit earthing facilities All panels shall be equipped with circuit earthing switches manufactured and tested in

accordance with the relevant standard specified in Section 6.

Earth switches shall be the integral type. The earthing of the circuit cables shall be effected via

a separately designed make-proof earthing switch. The earthing shall be located directly on the

circuit cable and designed without interposing further switching devices.

The earthing system shall be designed and tested for making a live circuit with a prospective

peak fault current in accordance with the switchboard requirements specified in Table 1 in

Section 6. Each circuit-earthing switch shall be mechanically interlocked with the corresponding

circuit breaker or switch. Refer to Section 13 for interlocking requirements.

The earthing switch shall be fully rated for fault making to the requirements specified in

Section 6.

Each switch shall be provided with a fail safe indicating device to positively indicate whether it is

in the OPEN OR EARTH position and the words 'OPEN' and 'EARTH' shall be used for the

respective indication of these positions.

The equipment shall be configured to allow the position of the earth switch contacts in the

EARTH position to observe directly. Appropriate long life, maintenance free illumination shall be

provided. The light source shall be replaced without the need for isolating HV equipment or

significant disassembly of the switchgear.

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17. Voltage detecting system A voltage detection system (VDS) in accordance with IEC 61243.-5 with integrated display to

detect the following shall be provided for all HV circuits:

x dead state

x operating voltage

x phase balance

A voltage presence indicating system (VPIS) in accordance with IEC 62271-206 is acceptable if

a VDS system is not available.

Suitable capacitive voltage dividers fitted in the cable connection area is acceptable.

Appropriate connections shall be provided to enable phase comparison in normal operating

conditions.

An optional feature is for remote indication of 11 kV cable voltage status and interlocking with

the earth switch. Interlocking shall inhibit the earthing of live circuit conductors.

18. Circuit test facilities Each circuit breaker panel shall incorporate an integral type circuit test facility.

All test facilities shall be suitable for the application of dc test voltages associated with the

after-installation testing of power cables. They shall be rated for the same system voltage as the

switchgear.

The test facility shall facilitate the connection of test equipment with the circuit earthed and then

allow the earths to be removed with the test equipment still connected.

A hand applied earthing set shall be connected to the circuit side of each circuit breaker panel

for use in conjunction with test equipment. The earth connection shall be applied or removed

independent of the application or removal of the test equipment connection. External removable

accessories shall be used to achieve this function.

19. Padlocking Facilities shall be provided to padlock the following:

x disconnector in the closed, open and earth positions

x circuit breaker in the open positions and the closed position while the disconnector is in the

earthed position

x circuit test facility, if applicable (see Section 12)

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All padlocking facilities shall be suitable for padlocks with a 6 mm shank diameter.

20. Floor fixing and penetration details All equipment required for the fixing of the switchgear to the floor shall be provided, inclusive of

the switchboard.

Drawings detailing the required floor levels, penetrations and any other civil requirements for the

installation of the switchboard shall be provided.

21. Segregation of LV wiring in HV compartment Any low voltage wiring within HV compartments shall be segregated, mechanically protected

and installed to provide adequate protection from a HV fault damaging the LV circuits.

Compliance with this requirement is detailed in the technical schedule provided in Appendix F.

22. Instruments, transducers and metering All instruments, transducers and metering equipment that are required to be fitted shall comply

with this section and the relevant requirements in T HR EL 00003 ST.

All indicating instruments shall be flush-mounted industrial type instruments that comply with the

requirements of the following IEC standards: IEC 60051-1, IEC 60051-2, IEC 60051-3,

IEC 60051-7, IEC 60051-8 and IEC 60051-9. The instruments shall be clearly visible and easily

readable from a standing position in front of the panel.

Analogue instruments shall have a scale length of at least 90 mm. All instruments on a

switchboard shall be scaled with the same type of characters of the same size. The instruments

shall be 96 mm x 96 mm in size, with black scales on a white background.

All current-operated instruments shall be protected against continuous over current up to 120%

of nominal value and high current surges up to the fault rating of the circuit breaker.

22.1. Current transducers Each feeder or transformer panel shall have one current transducer connected to B� of a

metering CT. The output of the current transducer shall be used to drive the ammeter and then

be connected to the SCADA RTU for remote indication.

The approved current transducers are specified in EP 19 00 00 02 SP.

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22.2. Voltage transducers A voltage transducer shall be connected to each VT and connected to the SCADA RTU for

remote indication.

The approved voltage transducers are specified in EP 19 00 00 02 SP.

22.3. Ammeters Ammeters shall have two scales that are essentially linear. The main scale shall allow for 120%

of the primary current rating of the current transformer and the second scale shall be equivalent

to the main scale divided by 5, to allow reading of lower currents. A pushbutton fitted to the front

of the ammeter shall activate the minor scale.

The current transformer ratio shall be clearly marked on the face of the ammeter.

The accuracy of ammeters shall be 3% or better and shall be stated in the technical schedule

provided in Appendix F.

22.4. Voltmeters Voltmeter shall have analogue indication with scales that have an indicating range of 80% to

120% of the nominal system voltages.

Where voltmeters that have a nominal range from 0% to 120% are required, this will be

specified at the time of order.

The nominal voltage shall be marked in red on the scale.

22.5. Watthour meter kWh meters shall be three phase, with pulse output. The pulse output rate shall be 10 per kWh.

Where required for revenue metering the kWh meter shall be connected to a metering CT of

suitable rating and accuracy class.

23. Busbar and circuit protection Protection schemes shall be in accordance with EP 19 00 00 02 SP.

The specific protection schemes for a switchboard are specified in the protection concept which

is issued at time of switchboard procurement.

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23.1. High impedance bus zone protection When a high impedance unit protection scheme is used, the associated components such as

protection relay, MTM, test block are to be located within one of the end panels that will be

nominated at time of order.

23.2. Internal arc fault detection scheme An alternative to the traditional high impedance scheme is subject to an approval by the ASA. If

approved, this system is the preferred scheme. If offered as an alternative to the high

impedance scheme the complete system description shall be provided during tender for

assessment.

23.3. Feeder protection The protection for feeders consists of overcurrent and earth fault protection and line differential

protection at strategic locations shall be required.

The protection scheme shall be specified in the protection concept which is required at time of

switchboard procurement.

23.4. System transformer protection The relays and associated equipment for the protection of system transformers are normally

located with the protection and control equipment for the higher voltage winding. The 11 kV

circuit breaker panel for a system transformer shall be configured for connection to the required

protection equipment located elsewhere. The neutral leakage relay is normally located on the

11 kV panel.

23.5. Distribution transformer protection The protection functions required for distribution transformers shall be implemented within the

11 kV panel. Inputs from gas relays or gas over pressure voltage free contacts, low voltage

equipment voltage free contacts and high temperature RTDs inputs shall form part of the

tripping circuit of the circuit breaker.

EP 19 00 00 02 SP defines two schemes for distribution transformers.

Primary protection is a transformer differential scheme, with overcurrent and earth fault

protection as backup.

Primary protection is overcurrent and earth fault protection with no backup.

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Where a differential scheme is required, terminals shall be provided for the connection of

current transformers on the secondary side of the transformer and the protection equipment

shall provide a trip output to trip the low voltage circuit breaker.

24. SCADA indications and controls The SCADA alarms from equipment are implemented by a combination of hard wiring and using

the serial link on the electronic protection relays. The serial communication port on all electronic

protection relays within a switchboard shall be connected together and wired to a terminal strip

for connection to the SCADA RTU.

Refer to EP 19 00 00 02 SP for further SCADA alarm requirements.

24.1. Binary indication and ACCB control Certain information is critical for system operation and shall be independent on the protection

relay or communication link to the RTU.

Table 7 details the SCADA alarms and control that are required to be hard wired to the RTU.

Table 7 - SCADA alarms and control – Hard wired

I/O Point Description. Hard Wired

Circuit breaker (Open, Closed)

Isolator position (Open, Closed)

Earthing switch position (Open, Closed)

Circuit breaker alarms (example: spring charge

motor)

Trip circuit supervision alarms

Gas/vacuum monitoring alarms

Protection relay watchdog alarms

Bus zone trip

ACCB Open Control

ACCB Close Control

24.2. Analogue indication The following analogue indications shall be provided to SCADA:

x circuit current (B phase) for each circuit breaker

x bus voltage (at least 1 phase ) for each switchboard

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Current transducers shall be provided to allow monitoring of primary circuit currents by SCADA.

Transducers shall be connected to a dedicated metering CT on B phase. Refer to Section 22.1

and Section 22.2.

24.3. Controls The SCADA RTU provides voltage free contacts which close for a maximum of 2 seconds for

the following control functions:

x circuit breaker Open (trip)

x circuit breaker Close

The SCADA RTU voltage free contacts have a maximum current rating of 1 A.

Interposing relays are to be provided for the SCADA initiated ACCB close and ACCB trip. Refer

to Section 11.2.2 for additional details.

The disconnector and earthing switch are manually operated and do not require SCADA control.

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Appendix A - Switchboard configurations

Appendix A specifies the configuration requirements for the switchboards and switchgear.

A.1 Switchboard configurations Most of the switchboard configurations applicable to the RailCorp network are detailed in

Appendix B.

Each switchboard shall be designed and manufactured specifically for each site within the

following constraints:

x the switchgear functional units shall be assembled into switchboard panels

x each switchboard shall include a bus bar voltage transformer (VT)

x standard circuit breaker functions are feeder, system transformer, distribution transformer,

tie (bus) and bus coupler

x switchboards with single bus tie panels shall have the bus tie at one end of the switchboard

Switchboards with two bus tie panels shall have the bus tie panels at opposite ends of the

switchboard. The position of each functional unit will be specified at time of order in

accordance with the approved for purchase operating diagram.

Where required for 11 kV network reasons, more than one switchboard may be required in a

substation. Such switchboards would normally be physically separated to reduce the risk of one

event damaging both. Switchboards are interconnected by a tie cable through a bus tie circuit

breaker at each end of the tie cable.

This is the preferred bus sectioning arrangement at a substation location. The cable tie requires

a high impedance unit protection scheme.

Where space or building constraints (example, cable ducts) exists, a bus coupling circuit

breaker arrangement may be required for the busbar sectionalising function. However, this is

not a preferred configuration.

A.1.1 Switchboard panel configuration codes Table 8 provides the switchboard panel configuration and their codes.

Table 8 - Switchboard panel configuration codes

Switchboard panel configuration Codes

Bus tie cable circuit breaker: switchgear code T

Feeder circuit breaker: switchgear code F

System transformer (incomer) circuit breaker: switchgear code ST

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Codes Switchboard panel configuration

Capacitor/harmonic filter circuit breaker: switchgear code C

Distribution transformer (outgoing) circuit breaker: switchgear code t

Feeder circuit breaker (non Auto): switchgear code Fna

Feeder network switch (Supervisory Indication only): switchgear code D

In conjunction with the switchboard common standards and ratings specified in Section 6, the

additional requirements stated in Table 9 are specific to ACCBs.

Table 9 - Switchboard panel configuration specific to ACCB

Switchboard panel configuration T B F ST t C Fna

Protection CT, resistors, supply fuses and

protection relays

Y Y Y Y Y Y

Protection relay test blocks: (see note 1) Y Y Y Y Y Y

Trip circuit supervision relays: (1 for each trip

coil)

Y Y Y Y Y

Remote control for the circuit breaker, with

changeover switch for remote control L/R,

anti pumping circuitry

Y Y Y Y Y Y Y

ACCB control circuitry and supply fuses Y Y Y Y Y Y Y

Motor operated drive mechanism and

controls

Y Y Y Y Y Y Y

VT on the incomer Y

Voltmeter & voltage transducer

VT secondary protection circuit breakers Y Y Y Y

CT's Y

CT test links, wiring terminals Y Y Y Y Y

Ammeter & current transducer Y Y Y

Cable test facility Y Y Y Y Y Y Y

Voltage detection system Y Y Y Y Y Y Y

Facilities for padlocking Y Y Y Y Y Y Y

Non-resettable mechanical operation

counter

Y Y Y Y Y Y Y

Other components as necessary Y Y Y Y Y Y Y

Note 1: Only one set of protection equipment is required per bus tie. The protection

equipment shall be located together in the appropriate compartment of the circuit

breaker at one end only of the tie cable. Normally this will be the lower numbered

busbar end.

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A.1.2 Bus coupling circuit breaker Where space or building constraints such as cable ducts exists, a bus coupling circuit breaker

arrangement may be required for the busbar sectionalising function. However, this is not a

preferred configuration.

The switchboard configuration is specified with a bus coupling circuit breaker sectioning the

busbar within a switchboard.

A.1.3 Capacitor/harmonic filter circuit breaker RailCorp switchgear code = C

A capacitor bank or harmonic filter circuit breaker is generally similar to a feeder circuit breaker.

However in each instance of use, the circuit breaker opening and closing duty shall be approved

by the manufacturer.

A capacitor circuit breaker shall have the ratings of a feeder circuit breaker. However, it will be

confirmed with the manufacturer as capable of breaking capacitive load current and

subsequently maintaining a resulting voltage across its contacts.

All capacitor ACCBs shall be arranged for local and remote control as specified in this

document.

In conjunction with the switchboard common standards and ratings specified in Section 6.1, the

following additional requirements are specific to capacitor ACCBs:

x prior service conditioning

x confirmation of opening duty

x confirmation of closing duty

x circuit earthing

Prior service conditioning

Circuit breaker contacts for capacitor or filter control shall be conditioned prior to use in

switching a capacitor bank. This may be achieved by placing a low voltage welder across the

circuit breaker contacts, ramping the current to the circuit breaker rating and then successively

opening and closing the breaker. Conditioning removes any manufacturing sharp edges that

may have resulted which in first true service may ultimately lead to re-strike.

An alternate method of achieving conditioned capacitor bank circuit breaker contacts is to swap

the circuit breaker with one that is already in service and that has been switched on load. The

circuit breaker to be swapped shall be similar in all other respects to the new unconditioned

circuit breaker.

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Confirmation of opening duty

A circuit breaker intended to supply a capacitor bank shall be confirmed suitable for the duty by

the manufacturer such that no re-strike will occur after the arc is extinguished in each pole.

The capacitor bank de-energisation shall place a dc offset on the power frequency voltage

across the circuit breaker contacts. In the worst case this dc offset may be taken to be 150% of

the system peak phase to neutral voltage.

If the manufacturer is not able to confirm the circuit breaker suitable for capacitor bank opening

resulting in a 150% dc voltage on the load side, then the expected opening transients shall be

simulated and supplied to the manufacturer for consideration and approval.

Where a floating neutral capacitor bank is used, then opening transient voltage simulations shall

take into account the following:

x possible purely capacitive coupling of the capacitor bank neutral to earth

x possible purely resistive coupling of the capacitor bank neutral to earth

Either case results in a differing trapped charge on the capacitor bank neutral following the last

two poles of the circuit breaker to open.

Time domain simulations shall account for saturable voltage transformers if they exist on the

capacitor bank load side of the circuit breaker.

Time domain simulations shall account for individual pole opening on current zero crossings

when an open command is issued.

Vacuum interrupting is preferred due to its natural dielectric recovery upon arc extinguishing. If

SF6 interrupters are used then the SF6 arc quenching mechanism shall not rely on movement

of the SF6 gas through the arc to quench the arc. This requirement allows for unexpected

delayed re-strike to be interrupted with arc quenching and dielectric strength recovery with the

circuit breaker contacts held still in the fully open position.

Confirmation of closing duty

The designed capacitor bank inrush currents and contact voltages on closing shall be time

domain simulated. Three phase plots of the circuit breaker contact inrush current shall be

forwarded to the circuit breaker manufacturer for approval.

Time domain simulations shall account for any back to back capacitor bank switching where

applicable.

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Circuit earthing

Provision of suitable earthing switches, interlocks and components for circuit and capacitor

discharge capability shall be included. Where required, one or more supplementary earthing

switch, interlocks and circuitry for the neutral of a floating capacitor bank shall be provided.

A.1.4 Feeder circuit breaker (non Auto) RailCorp switchgear code = Fna

Supervisory controlled circuit breaker configured as non-auto (no CTs or protection relay fitted).

A.1.5 Feeder network switch (supervisory indication only) RailCorp switchgear code = D

Fully rated load break, fault make feeder network switch complete with integral fully rated earth

switch configured for supervisory indication only.

Table 10 - Feeder switch specific requirements

Parameter atingR

Feeder Fault make, load break switch to AS 60265.1 400 Amp

class E2/M1 – Rated current

Components to be fitted are as follows:

x auxiliary contacts

x cable test facility

x voltage detection system

x facilities for padlocking

x non-resettable mechanical operation counter

x other components as necessary

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Appendix B - Typical switchboard configurations

Due to the variability of the requirements for SCADA controlled 11 kV switchboards, it is not

possible to identify all configurations. Table 11 through Table 16 lists the typical configurations

that apply to the RailCorp electrical network.

B.1 Supply point switchboard configurations Table 11 - Supply point switchboard configuration

Code Build

ST1FT 1 incoming System Tx ACCB with VT + 1 Feeder ACCB +1 Tie ACCB + Busbar

VT

ST2F 1 incoming System Tx ACCB with VT + 2 Feeder ACCB + Busbar VT

ST2FC 1 incoming System Tx ACCB with VT + 2 Feeder ACCB + 1 Capacitor ACCB +

Busbar VT

ST2FtT 1 incoming System Tx ACCB with VT + 2 Feeder ACCB + 1 Distribution tx ACCB +

1 Tie ACCB + Busbar VT



B.2 Switching station switchboard configurations Table 12 – Switching Station switchboard configuration

Code Build

2FT 2 Feeder ACCB + 1 Tie ACCB + Busbar VT

3F 3 Feeder ACCB + Busbar VT

3FT 3 Feeder ACCB + 1 Tie ACCB + Busbar VT

4F 4 Feeder ACCB + Busbar VT

B.3 System substation switchboard configurations Table 13 - System Substation switchboard configuration

Code Build

1Ft 1 Feeder ACCB + 1 Distribution tx ACCB + Busbar VT

1FtT 1 Feeder ACCB + 1 Distribution tx ACCB + 1 Tie ACCB + Busbar VT



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B.4 Mid point switching switchboard configuration Table 14 – Feeder mid point switchboard configuration

Code Build

1FnaD 1 Feeder ACCB (non auto) + 1 network Switch (D) (supy indication)+ Busbar VT

1FD 1 Feeder ACCB + 1 network Switch (D) (supy indication)+ Busbar VT

B.5 Bus coupled circuit breaker switchboard Table 15 – Bus coupled switchboard configuration

Code Build

ST2FB1Ft 1 incoming System Tx ACCB with VT + 2 Feeder ACCB +. Busbar VT +. Bus

coupling ACCB + 1 Feeder ACCB + 1 Distribution tx ACCB + Busbar VT

B.6 Example switchboard configurations Figure 1 through Figure 18 provides examples of switchboard configurations.

Table 16 shows the details of CT and relays present in the examples.

Table 16 – CT and relay details

CT Description

C1 600/1 0.03PL 120R2.0

C2 300/1 1M5VA

C3 300/1 2.5VA CLASS 10P20

C4 300/1 0.05PX50R0.5

C5 450/1 2.5VA CLASS 10P20

C6 450/1 0.05PX50R0.5

C7 100/1 0.15 PX50R0.3

C8 100/1 2.5VA CLASS 10P20

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Figure 1 - Example switchboard type ST1FT and 3FT

Figure 2 - Example switchboard type 2FtT

Note 1 – Interlocks and earths VT secondary

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Figure 3 - Type ST1FT

Figure 4 - Type ST2F

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Figure 5 - ST1FtT


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INT

ER

TR

IP IN

ITIA

TE


Figure 8 - Type 2FT

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Figure 9 - Type 3F

Figure 10 - Type 3FT

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Figure 12 - Type 1Ft

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Figure 13 - Type 1FtT


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Figure 16 - Type 1FnaD

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INT

ER

TR

IP I

NIT

IAT

E

Figure 17 - Type 1FD

Figure 17 shows a switch that includes a CT for a busbar protection scheme. The need for a

busbar scheme will be specified at the time of order. If the busbar scheme is not required the

switch will not require a CT.

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Figure 18 - Type ST1FB1Ft

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Appendix C - Integrated system support requirements

C.1 Integrated support objectives The switchgear manufacturer shall establish and provide the information required to operate

and maintain the equipment throughout its operational life, in a cost effective manner and to a

level that is consistent with the planned operational performance and usage of the switchgear.

This includes the following:

x specifying maintenance requirements

x spares support

x operations and maintenance manuals

x training

x support equipment and tooling

C.2 Equipment supplier deliverable The integrated support requirements are a significant deliverable in the procurement of new

switchgear. Manuals, training, documentation and other support deliverables shall be in

accordance with T HR EL 00002 PR Electrical Power Equipment - Integrated Support

Requirements.


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Appendix D - Tests

Testing requirements are to be read in conjunction with the specification T HR EL 00003 ST.

D.1 Routine tests For each panel the following tests are to be carried out. Routine test reports shall be provided

to ASA.

Switchgear routine tests as listed in the following standards shall be carried out:

x AS 62271.1, Section 7

x AS 62271-100, Section 7

x AS 60694 and AS 62271-200, all Section 7. For non GIS Section 7.2 is applicable.

CT and VT routine tests as listed in the following standards shall be carried out:

x AS 60044.1 Instrument transformers - Current transformers

x AS 60044.2 Instrument transformers – Inductive voltage transformers

D.2 Type tests The results of type tests as required in the following standards shall be made available by the

supplier on request:

x AS 62271.1

x AS 62271-100

x AS 62271-200

x AS 62271-200 Appendix A7, test report for internal arc

Test certificate details, demonstrating compliance with the standards specified, including the

date, results and name of the testing body shall be supplied in the technical schedule provided

in Appendix F.

Type test certificates for each of these tests shall be accepted where it can be demonstrated

that the switchgear supplied is of a similar design to previously type tested switchgear.

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Appendix E - Data set associated with the equipment

The following data set shall be supplied by the manufacturer and maintained for the switchgear.

This data will remain as a property of TfNSW.

E.1 Information The base set of required drawings is as listed in AS 62271.1, Appendix A2.

Additional information and requirements as a deliverable under equipment supply is

documented in the following specifications:

x T HR EL 00002 PR Electrical Power Equipment - Integrated Support Requirements.

x T HR EL 00003 ST, Common Requirements for Electric Power Equipment.

x EP 19 00 00 02 SP, Protection System Requirements for High Voltage Network.

E.2 Technical schedule The information listed in the technical schedule in Appendix F, supplied by the manufacturer,

shall be maintained for each switchboard.

E.3 Life cycle costing All the data and assumptions pertaining to the determination of the whole-of-life cost

calculations of the switchgear shall be recorded.

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Appendix F - Technical schedule

The manufacturer shall supply the information listed in this technical schedule.

Description

General switchgear information:

Manufacturer .………………............

Country of origin .………………............

Catalogue/type designation

Feeder ACCB (code F) .………………............

Bus-coupling ACCB (code B) .………………............

Bus-tie cable ACCB (code T) .………………............

System transformer ACCB (code ST) .………………............

Distribution transformer ACCB (code t) .………………............

Capacitor/Harmonic filter ACCB (code C) .………………............

Feeder network switch (code D) .………………............

Feeder (non auto) ACCB (code Fna) .………………............

Switchgear ratings:

Rated system voltage (Ur) .………………............ kV

Rated frequency (fr) .………………............ Hz

Rated busbar normal current (Ir) .………………............ A

Switchboard class .………………............

Busbar insulation medium .………………............

Rated lightning impulse withstand voltage (Up) .………………............ kV

Common value .………………............ kV

Across the isolating distance .………………............ kV

Rated short-duration power-frequency withstand voltage (Ud) .………………............

Common value (kV) .………………............

Across the isolating distance (kV) .………………............

Rated short time withstand current (Ik)


.………………............ kA

Rated peak withstand current (Ip)


.………………............ kA

Rated duration of short circuit (tk)


.………………............ s

Internal arc classification (IAC) .………………............

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Arc test current .………………............ kA

Arc test current duration .………………............ s

Rated short circuit making current .………………............ kA

Rated short circuit breaking current .………………............ kA

Short duration power frequency withstand voltage .………………............ kV

Rated supply voltage of closing and opening devices and of

auxiliary and control circuits (Ua)

.………………............

Partition class (as defined in AS 62271 – 200, Annex A) .………………............

Partial discharge level of complete switchboard including all

components

.………………............

Rated normal current (Ir) .………………............

Feeder ACCB (code F) .………………............ A

Bus-coupling ACCB (code B) .………………............ A

Bus-cable tie ACCB (code T) .………………............ A

System Transformer ACCB (code ST) .………………............ A

Distribution Transformer ACCB (code t) .………………............ A

Capacitor/Harmonic Filter ACCB (code C) .………………............ A

Feeder (non auto) ACCB (code Fna) .………………............ A

Feeder network load switch (code D) .………………............ A

Provide derating factors (if applicable) for ambient conditions

to a maximum of 50qC (derating factors should be in a form of

table or graph).

.………………............

Interrupter type .………………............

Rated supply voltage of closing and opening devices and of

auxiliary and control circuits (Ua)

.………………............

Number of trip coils .………………............

Number of close coils .………………............

Breaking time (max) .………………............ ms

Command response time both ON and OFF (max) .………………............ ms

Rated switch operating sequence .………………............

Type of circuit breaker operating mechanism offered .………………............

Circuit breaker mechanical durability class .………………............

Circuit breaker electrical durability class .………………............

Supply voltage, peak power and steady power of the spring

charge motor (where applicable)

.………………............

Voltage and peak power ratings for the continuous operation

of the circuit breaker coils

.………………............

Peak auxiliary current requirements and associated duration

for circuit breaker with magnetic actuator operation at

125 V dc (where applicable)

.………………............

.………………............

A

s


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Number of circuit breaker spare auxiliary contacts .………………............

Normally Open .………………............

Normally Closed .………………............

Rating of ACCB spare auxiliary contacts

.………………............ A

V

Description of all operational and safety interlocking

arrangements

.………………............

Table of all possible and inhibited states that the circuit

breakers and switches in the switchgear may occupy

.………………............

Analysis demonstrating the integrity of all interlocking

arrangements which includes an analysis of all possible failure

modes and the controls designed in to manage them

.………………............

Does the circuit breaker panel include in-line off-load

disconnectors?

.………………............

Description of the panel busbar interconnection arrangements .………………............

Type, ratings, details of circuit voltage detection system .………………............

Surge arrester types accommodated .………………............

Surge arrester mounting details/restrictions .………………............

Details of Segregation, mechanical protection of LV wiring in

HV compartments

.………………............

Internal arc fault detection and protection scheme details. If

offered as alternative to high impedance bus protection.

.………………............

HV Cable Access, testing and termination details

Provide details of how the HV cables are accessed

Maximum size and number of HV cables that can be terminated in each circuit breaker panel.

Clearly specify clearances between each cable termination of each phase.

Provision of a detailed dimensioned drawing of the arrangement is required.

Type of cable termination offered. Specify manufacturer, model and full details of separable

insulated connector and associated detail on the shielding arrangement (if applicable)

Type of circuit test facility offered

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Describe the test plugs (if applicable)

Earth switch and earthing facilities

Rated normal current (Ir) .………………............ A

Rated make fault current rating .………………............ A

Earth switch mechanical durability class .………………............

Earth switch electrical durability class .………………............

Provide details of the circuit earthing facilities offered including the method of indicating the

position of the earthing switch and guaranteeing the integrity of that indication.

Provide details of the earthing bars for feeder ACCB panels, and how the requirements of insulated

cable screen earth bar is met.

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Network load Switch (code = D)

Rated system voltage (Ur) .………………............ kV

Rated normal current (Ir) .………………............ A

Details of fault making switch offered .………………............

Is the switch offered 2-way or 3-way? .………………............

Switch mechanical durability class .………………............

Switch electrical durability class .………………............

Load break capability .………………............

Load make capability .………………............

Method of Interlocking with fully rated earth switch .………………............

Details relating to Capacitor/Harmonic ACCB

Has the switchgear been used for un-earthed, straight (no

reactors) capacitor bank switching previously? .………………............

Has allowance been made for the capacitor bank circuit breakers

to be pre-conditioned ready for service with negligible probability

of re-strike? .………………............

Has the switchgear been tested for 150% dc offset and nominal

ac voltage across the open contacts, successfully passing with no

discharge in the contact dielectric? .………………............

Has allowance been made for capacitor bank energisation

currents to be reviewed for use based on the particular site

design? .………………............

Low voltage panel/equipment

Where are the protection relays, test blocks, meters and low voltage fuses located?

Describe LV termination and cable access arrangements

Rating plate attachment method

Labels attachment method

Provide details of paint coatings on the switchgear

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Provide details of colours of custom paint coatings available.

Current transformers (CT)

Type of CTs being offered

Where are the CTs located and how are they mounted.

Detail the physical space limitations

Are the CTs offered the same ratio & class as specified in the standard? If not please provide

details of variances.

Busbar protection scheme

Yes/Is the busbar protection scheme offered a high impedance scheme?

No

If the busbar protection scheme offered is not a high impedance scheme please provide details

of the alternate scheme including:

x detailed operating documentation

x detailed maintenance documentation

x copies of test certificates

Voltage transformers (VT)


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Describe the physical location of the VTs (busbar and incomer) and relevant dimensions.

How are the VTs connected/isolated?

Are fuses fitted to the primary side of the VTs?

Describe the method(s) for simulation of system earth faults during test and commissioning of

directional relays.

Details of voltage transformers offered: .………………............

name of manufacturer .………………............

ratio and class .………………............

burden,VA .………………............

voltage factor .………………............

location and type of fuses .………………............

Site installation details

How are the switchboards transported to site? Detail whether panels are assembled on site and

then gassed or assembled and gassed prior.

Are there any site specific requirements for installation (example, floor surface requirements)

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Provide details of how the panels/switchboards are lifted and moved into position on site.

Switchboard dimensions and weights

Switchboard – Provide general arrangement drawings showing

overall dimensions (h, w, d in mm), cable termination locations and

required space for access and arc venting requirements for

ST1FT, ST2FtT, 1FnaD, 1FD configurations. ............……………….

Required side clearance of switchboard (mm) ........... .……………….

Required rear clearance of switchboard (mm) ........... .……………….

Required clearance on top of switchboard (mm) .………………............

Required clearance at front of switchboard for installation and

removal (mm) .………………............

Recommended cable trench width (mm) .………………............

Depth of protrusions into cable trench (if applicable) .………………............

Weight of heaviest configuration (kg) .………………............

Reliability Data:

Failure Modes (for early, Normal life and wear out periods)

Mean operating hours between failure modes

Mean time to repair. Provide details of any special requirements, test and support equipment

and so on

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Number of units in service in Australia

Period (years) this model/type has been available for purchase. .………………............

Estimated period before replacement with new model. .………………............

Number of units in service worldwide

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Appendix G - Guide to information requirements for Request for Tender

Application

The following material is provided as a guidance for preparing the Request for Tender for this

type of equipment. This checklist itself is not intended to directly form part of any contract.

This section is to be read in conjunction with the RFT Checklist provided in T HR EL 00003 ST.

Information to be sought from the tenderer

Integrated support information as per the following documents shall be sought from the

tenderer:

x T HR EL 00002 PR Electrical Power Equipment - Integrated Support Requirements

x Tenders to complete and submit the Technical Schedule provided in Appendix F

Information to be supplied at time of order

When needed for procurement of equipment for a particular location, in addition to the general

requirements in this specification the following information related to the particular site shall be

supplied as part of the order:

x Approved (for purchase) HV operating diagram for each substation. This diagram is under

configuration control.

x Required quantity and associated switchboard code. This information shall be consistent

with the approved (for purchase) operating diagram. The position of each functional unit

within the switchboard shall be in accordance with the approved (for purchase) operating

diagram.

x The number of sets, position and specification of the CTs, protection relay and protection

scheme shall be detailed in the authorised protection concept (approved for purchase)

associated with each switchboard. The protection concept (approved for purchase) shall

be provided with each switchboard order.

x DC control voltage to be specified for each switchboard order. Choice is either 125 V dc or

50 V dc. This is a requirement in the approved protection concept for the location.

Associated protection relays, RTU, switchgear and so on will need to be compatible with

the location battery supply.

x Busbar rating of 630 A or 1250 A.

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x Panel location of busbar high impedance unit scheme components such as relay, test

block, MTM relay, links and associated wiring.

x The specific configuration of instruments, transducers and metering equipment (voltage,

current and energy), to be installed on switchgear panels.

x The required number of cables and size per phase, per panel.

x Feeder specific surge arrester requirements.

x Any site specific restrictions on the dimensions or placement of the switchgear.

x Special transport or unloading requirements.

x Notice that the supplier will be required to provide appropriate seals for switchboard and

associated components to prevent contamination during storage and transport.

x Requirement for specific deliverables including the following:

o installation and on-site operational testing if required to be carried out by the supplier

o requirements for training

o requirements for spares

o recovery and replenishment of SF6 gas after its service life (rendered by the supplier

of SF6 switchgear)

o two spare sets of fuses for each voltage transformer

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