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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
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
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
or visit www.asa.transport.nsw.gov.au
© State of NSW through Transport for NSW
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 3 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.
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 4 of 59
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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Issued Date: 16 September 2014
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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
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 6 of 59
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
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 7 of 59
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
T HR EL 01001 SP
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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
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
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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
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 10 of 59
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
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
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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)
(for main and earthing circuits)
40 kA (peak)
Rated duration of short circuit (tk)
(for main and earthing circuits)
1 sec
Internal arc classification (IAC)
Arc test current
Arc test current duration
AFLR
16 kA
1 sec
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 12 of 59
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
Option 2 – 50 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.
Option 1 – 125 V dc
Option 2 – 50 V dc
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)
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
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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.
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 14 of 59
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.
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 15 of 59
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.
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 16 of 59
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.
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 17 of 59
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.
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 18 of 59
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
ST3F 1 incoming System Tx ACCB with VT + 3 Feeder ACCB + Busbar VT
ST4F 1 incoming System Tx ACCB with VT + 4 Feeder 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
2FtT 2 Feeder ACCB + 1 Distribution tx ACCB + 1 Tie ACCB + Busbar VT
3FtT 3 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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© State of NSW through Transport for NSW Page 37 of 59
Figure 3 - Type ST1FT
Figure 4 - Type ST2F
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 38 of 59
Figure 5 - ST1FtT
Figure 6 - Type ST3F
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 39 of 59
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Figure 7 - Type ST4F
Figure 8 - Type 2FT
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 40 of 59
Figure 9 - Type 3F
Figure 10 - Type 3FT
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 41 of 59
Figure 11 - Type ST4F
Figure 12 - Type 1Ft
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 42 of 59
Figure 13 - Type 1FtT
Figure 14 - Type 2FtT
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 43 of 59
Figure 15 - Type 3FtT
Figure 16 - Type 1FnaD
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 44 of 59
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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.
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 45 of 59
Figure 18 - Type ST1FB1Ft
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
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.
© State of NSW through Transport for NSW Page 46 of 59
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 47 of 59
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.
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 48 of 59
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.
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 49 of 59
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)
(for main and earthing circuits)
.………………............ kA
Rated peak withstand current (Ip)
(for main and earthing circuits)
.………………............ kA
Rated duration of short circuit (tk)
(for main and earthing circuits)
.………………............ s
Internal arc classification (IAC) .………………............
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
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
© State of NSW through Transport for NSW Page 50 of 59
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 51 of 59
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
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 52 of 59
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.
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 53 of 59
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
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
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)
© State of NSW through Transport for NSW Page 54 of 59
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 55 of 59
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)
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 56 of 59
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
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 57 of 59
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
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 58 of 59
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.
T HR EL 01001 SP
11 kV Indoor Switchgear - SCADA Controlled
Version 1.0
Issued Date: 16 September 2014
© State of NSW through Transport for NSW Page 59 of 59
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