EP 03 02 00 01 SP - Controls and Protection for ......ST v1.0, 25/05/2018 CONTROLS & PROTECTION FOR...

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CONTROLS & PROTECTION FOR RECTIFICATION EQUIPMENT

Engi

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Spec

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EP 03 02 00 01 SP

Engineering Specification Electrical

Version 2.1

Issued May 2013

Owner: Chief Engineer, Electrical

Approved by:

Neal Hook Chief Engineer Electrical

Authorised by:

Neal Hook Chief Engineer Electrical

Disclaimer This document was prepared for use on the RailCorp Network only. RailCorp makes no warranties, express or implied, that compliance with the contents of this document shall be sufficient to ensure safe systems or work or operation. It is the document user’s sole responsibility to ensure that the copy of the document it is viewing is the current version of the document as in use by RailCorp. RailCorp accepts no liability whatsoever in relation to the use of this document by any party, and RailCorp excludes any liability which arises in any manner by the use of this document. Copyright The information in this document is protected by Copyright and no part of this document may be reproduced, altered, stored or transmitted by any person without the prior consent of RailCorp.

UNCONTROLLED WHEN PRINTED of 25

RailCorp Engineering Specification — Electrical Controls & Protection for Rectification Equipment EP 03 02 00 01 SP

© RailCorp of 25 Issued May 2013 UNCONTROLLED WHEN PRINTED Version 2.1 S

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Document control

Version Date Summary of change January 2004 Last Technical Review

2.0 May 2010 Application of TMA 400 format 2.1 May 2013 Update template


© RailCorp of 25 Issued May 2013 UNCONTROLLED WHEN PRINTED Version 2.1

Contents

1 Scope........................................................................................................................................5 2 Application...............................................................................................................................5 3 References and Standards.....................................................................................................5 3.1 RailCorp Engineering Standards ..............................................................................................5 3.2 Standards..................................................................................................................................6 3.3 Drawings ...................................................................................................................................6 4 Definitions and Abbreviations ...............................................................................................7 5 Functional Requirements.......................................................................................................7 5.1 General......................................................................................................................................7 5.2 Controls ...................................................................................................................................10

5.2.1 General ....................................................................................................................10 5.2.2 Control Changeover Switch.....................................................................................10

5.2.2.1 Changeover Switch in “Supervisory” Position..........................................10 5.2.2.2 Changeover Switch in “Local” Position ....................................................10

5.2.3 Indications................................................................................................................10 5.2.4 Rectifier Transformer Tapchanger...........................................................................11 5.2.5 Power Supply...........................................................................................................11 5.2.6 Local/Remote Changeover Switch on Remote ACCB ............................................12

5.3 Protection ................................................................................................................................12 5.3.1 General ....................................................................................................................12 5.3.2 Instantaneous Overcurrent and Earth Fault ............................................................14 5.3.3 Breaker Fail .............................................................................................................15 5.3.4 DC Reverse Current ................................................................................................15 5.3.5 Rectifier Unit Protection ...........................................................................................15 5.3.6 Negative Isolator Accessed .....................................................................................15 5.3.7 Negative Isolator Opened........................................................................................16 5.3.8 Rectifier Frame Leakage .........................................................................................16 5.3.9 DCCB Frame Leakage ............................................................................................16 5.3.10 Transformer Buchholz .............................................................................................16 5.3.11 DC Reactor Overpressure .......................................................................................17 5.3.12 Trip Circuit Supply Failure .......................................................................................17 5.3.13 Busbar Zone ............................................................................................................17 5.3.14 HV ACCB Alarms.....................................................................................................17 5.3.15 Rectifier Transformer Alarms...................................................................................17 5.3.16 Spare Protection Trip Circuit ...................................................................................18 5.3.17 Current Transformers ..............................................................................................18

5.4 Metering ..................................................................................................................................18 5.4.1 DC Ammeter and Voltmeter.....................................................................................18 5.4.2 Primary Current Transducer ....................................................................................18

6 Interface Equipment..............................................................................................................19 6.1 General....................................................................................................................................19 6.2 Remote Alarm and Indication Contacts (Inputs) .....................................................................19 6.3 Control Supply.........................................................................................................................19

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6.4 Rectifier Power Cubicle...........................................................................................................19 6.5 Rectifier Transformer ..............................................................................................................19 6.6 AC Circuit Breaker ..................................................................................................................19 6.7 DC Circuit Breaker ..................................................................................................................19 6.8 Common Circuits Panel ..........................................................................................................19 6.9 SCADA....................................................................................................................................20 7 Implementation......................................................................................................................20 7.1 Options....................................................................................................................................20 7.2 Implementation by Discrete, Hard-wired Components ...........................................................20 8 Integrated System Support Requirements.........................................................................20 8.1 Integrated Support Objectives ................................................................................................20 8.2 Equipment Supplier Deliverable..............................................................................................20 9 Testing....................................................................................................................................21 10 Data Set Associated With The Equipment..........................................................................21 Appendix A Technical Schedule ...............................................................................................22 Appendix B DCCB Terminal Box Connections........................................................................23 Appendix C Request for Tender Checklist...............................................................................24 Appendix D Requirements for Technical Aspects of Tender Evaluation .............................25

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1 Scope This document details the whole-of-life performance requirements for the control and protection equipment used for the rectification process in RailCorp traction substations. It contains all the information required to ensure that the control and protection arrangements are compatible with all types of semiconductor rectifier power cubicles used within the RailCorp network, except those that require a cell fail scheme or have controlled forced cooling.

This document provides the control logic and interfacing requirements for the operation of, and indications for, rectification and associated equipment, including the HV ACCB, rectifier transformer, rectifier and DCCB. This version of the document does not apply to schemes using a motorised positive link or other arrangement in lieu of a Rectifier DCCB.

Representative schematic diagrams are included at Appendix A. This is an example of a conforming design for one possible implementation strategy. These schematics are provided for information and to assist in the understanding of the text. It is not required that the circuits implemented are exactly in accordance with the representative schematics, however they shall provide all functions embodied by the schematics and specified herein.

2 Application The rectification control and protection equipment can be implemented as a stand-alone cubicle or can be incorporated with other equipment, for example, the HV AC switchgear panel.

The requirements of this document apply when new rectification control and protection equipment is installed in a RailCorp traction substation. The rectification control and protection equipment that has been installed in the last few years meets most of the requirements of this document. There are some differences in control logic due to the relocation of the negative isolator into the power cubicle and changes to metering requirements, including electrical and temperature monitoring. The release of this document will not affect the operation or maintenance of existing rectification control and protection arrangements in the RailCorp network.

3 References and Standards The following documents contain provisions, which through reference in this text, constitute provisions of this specification.

3.1 RailCorp Engineering Standards The following RailCorp Engineering Standards are referenced in this document:

EP 00 00 00 12 SP Electrical Power Equipment – Integrated Support Requirements EP 00 00 00 13 SP Electrical Power Equipment – Design Ranges of Ambient

Conditions EP 00 00 00 15 SP Common Requirements for Electric Power Equipment EP 01 00 00 01 SP 33 kV AC Indoor Switchgear – Non-Withdrawable EP 03 00 00 01 TI Rectifier Transformer & Rectifier Characteristics EP 03 01 40 00 SP Rectifier Transformer EP 03 02 30 00 SP Semiconductor 12 Pulse Series Bridge Rectifier – Power

Cubicle

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EP 03 05 70 00 SP Outdoor DC Reactor EP 19 00 00 02 SP Protection System Requirements for the High Voltage Network ED0001 P – ED0021 P inclusive Engineering Design Management Procedures CAD Manual (Draft version in production)

3.2 Standards Relevant Australian and International Standards are listed in RailCorp Standard EP 00 00 00 15 SP “Common Requirements for Electric Power Equipment”.

3.3 Drawings The following drawings are an example of a discrete component implementation of the rectification control and protection arrangements. The latest version of these drawings should be obtained to assist with the interpretation of the requirements of this document.

The diagrams are referenced as an example of a conforming design and are provided for information and to assist in the understanding of the text.

It is not required that the circuits implemented are exactly in accordance with the representative schematics except where explicitly required by the specification, however they shall provide all functions embodied by the schematics and specified herein.

RailCorp makes no warranty that the representative schematics as presented are suitable for use with any particular equipment.

EL 0228201 General, EP 03 02 00 01 SP, Substation Generic, Rectification Controls & Protection, Legend / Equipment List

EL 0228202 General, EP 03 02 00 01 SP, Substation Generic, Rectification Controls & Protection, Schematic Diagram – Main & CT Circuits

EL 0228203 General, EP 03 02 00 01 SP, Substation Generic, Rectification Controls & Protection, Schematic Diagram – ACCB Controls

EL 0228204 General, EP 03 02 00 01 SP, Substation Generic, Rectification Controls & Protection, Schematic Diagram – DCCB Controls

EL 0228205 General, EP 03 02 00 01 SP, Substation Generic, Rectification Controls & Protection, Schematic Diagram – Protection Lockout

EL 0228206 General, EP 03 02 00 01 SP, Substation Generic, Rectification Controls & Protection, Schematic Diagram – Status & Alarm Indication

EL 0228207 General, EP 03 02 00 01 SP, Substation Generic, Rectification Controls & Protection, Schematic Diagram – SCADA Interface

EL 0228208 General, EP 03 02 00 01 SP, Substation Generic, Rectification Controls & Protection, Schematic Diagram – Analogue Signals & Reactor Alarms

Refer also to Section 7.2.

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4 Definitions and Abbreviations ACCB Alternating current circuit breaker

DCCB Direct current circuit breaker

LED Light Emitting Diode.

Lockout The ACCB and DCCB are tripped by the operation of one or more protective devices and cannot be reclosed until an operator has attended on site to reset the ‘lockout’.

Remote control Operation of equipment using supervisory control.

RTU Remote Telemetry Unit (Interface to SCADA system)

SCADA Supervisory Control and Data Acquisition system.

Supervisory A connection to the Electrical Operating Centre to allow the remote operation of circuit breakers and provision for remote monitoring of alarms using a SCADA system.

5 Functional Requirements

5.1 General The equipment covered by this document will be used in traction substations. The substations convert electricity from the RailCorp high voltage AC network to supply its railway traction system at a nominal 1500 V DC.

The positive side of the rectifier feeds the overhead conductors of the system through 1500 V DC high speed circuit breakers. The negative return is via the rails, which are unearthed but normally close to earth potential.

SCADA equipment is used to provide remote open and close signals for the control of the ACCB and DCCB associated with the rectifier and remote indication of whether the circuit breakers are open or closed and also alarm conditions related to the rectifier.

Figure 1 - Standard Transformer and Rectifier AC Arrangement


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Figure 2 shows the typical RailCorp substation DC equipment arrangement.

Figure 2 - Typical Substation DC Arrangement

Figure 3 shows the typical RailCorp rectifier block diagram indicating the interfaces between the rectifier, the rectification control and protection equipment and other substation equipment.


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Figure 3 - Rectification Control and Protection Equipment Interface Block Diagram


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5.2 Controls

5.2.1 General The rectification control and protection equipment shall include all the functions necessary for operation of the rectifier HV ACCB, rectifier transformer off-line tapchanger and rectifier DCCB and to provide indications of alarm conditions and the state of the HV ACCB, tapchanger, DCCB and rectifier negative isolator.

5.2.2 Control Changeover Switch The rectification control and protection equipment shall be arranged to facilitate operation both locally and from SCADA. The mode of operation shall be dependent on the position of a Local/Supervisory changeover switch supplied with the control and protection equipment.

5.2.2.1 Changeover Switch in “Supervisory” Position With the Local/Supervisory changeover switch in the Supervisory position the ACCB shall be controllable by momentary Close and Open command signals from the SCADA RTU as described in Section 6.9. The Close command shall close the ACCB and this shall be followed immediately by the DCCB closing. The Open command shall open the ACCB and this shall be followed immediately by opening of the DCCB. Local Close and Open pushbuttons on the rectification control and protection panel shall be disabled.

Link terminals shall be provided with the rectification control and protection equipment for receipt of the Close and Open signals so that they can be isolated.

5.2.2.2 Changeover Switch in “Local” Position With the Local/Supervisory changeover switch in the Local position it shall be possible to close and open the ACCB and the DCCB independently of each other using pushbuttons on the rectification control and protection panel. The supervisory Open and Close shall be inoperative.

5.2.3 Indications Local visual indication of the state of the circuit breakers and negative isolator shall be provided by LED indicators of minimum diameter 10 mm mounted on the front of the rectification control and protection panel. A red LED indicator shall be used to indicate Closed and a green LED indicator for Open.

A maintained indication Rectifier Closed shall be wired to the control and protection equipment terminal block for extension to the SCADA RTU. This signal shall be at 120 V positive and shall be derived from an auxiliary contact of the DCCB.

All status and alarm indications shall occur regardless of the position of the Local/Supervisory changeover switch.

Refer to Section 5.3 for alarm conditions that are to be extended to the SCADA RTU.

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5.2.4 Rectifier Transformer Tapchanger Selection of Supervisory and Local modes for the tapchanger will be made by selector switch at the tapchanger control panel, independent of the rectification controls mode.

The tapchanger will be rated only for off-line tapchanging. Interlocking is required therefore to prevent tapchanging when the ACCB is closed.

Provision shall be made in the rectification control and protection equipment to receive the following voltage signals from the SCADA RTU and re-transmit them to the tapchanger control panel. (This is shown on sheet 7 of the representative schematic diagrams):

• Raise Tap • Lower Tap • 120V -ve

Link terminals shall be provided with the rectification control and protection equipment for receipt of these signals so that they can be isolated.

A further signal “Tap Change Enable” at 120 V +ve shall be transmitted to the tapchanger control panel only when the ACCB is open, as denoted by contact 52-5 being closed. The 120V +ve shall be derived from the ACCB closing circuit as shown on sheet 3 of the representative schematic diagrams (see Section 3.3).

Approximately 1 second before a tapchange operation is about to start, the tapchanger control panel will extend a signal to the rectification controls which shall be used to prevent closing of the ACCB. The representative schematic diagrams included at Appendix A provide an example of how this may be done - refer to relay 84TY on sheet 5 and contact 84TY-1 in the ACCB closing circuit on sheet 3.

5.2.5 Power Supply The rectification control and protection cubicle shall be the distribution point for supply of 120V DC to:

• DCCB closing, • DCCB control, • ACCB closing, • ACCB control and protection, • transformer tapchanger control, • rectifier transformer auxiliaries, • rectifier auxiliaries, • breaker fail protection relay auxiliary supply, and • local indication and supervisory indication circuits.

This arrangement is shown on sheets 3, 4, 5, 6 and 7 of the representative schematic diagrams (see Section 3.3). The rectification control and protection equipment shall retain the basic configuration and philosophy regarding circuit segregation, number of fuses and links, and fuse ratings, with alterations only as required to interface with the equipment actually being supplied.

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5.2.6 Local/Remote Changeover Switch on Remote ACCB The following requirements apply where a remote (outdoor) ACCB is used. Such ACCB will include an integral Local/Remote changeover switch and Trip/Normal/Close control switch.

The rectification control and protection equipment shall be designed so that working in conjunction with an ACCB with Local/Remote changeover switch is possible. The example circuitry shown on Sheet 3 of the representative schematic diagrams allows this to occur. The following logic functions are required:

a) Local/Remote Changeover Switch in Local Position.

i) ACCB can be closed and opened using the Trip/Normal/Close switch at the ACCB.

ii) It is not possible to close the ACCB from the rectification control and protection panel with the Local/Supervisory changeover switch at Local.

iii) It is not possible to close or open the ACCB from the supervisory SCADA with the Local/Supervisory changeover switch at Supervisory.

iv) ACCB can be opened using the Open pushbutton at the rectification control and protection equipment panel if the Local/Supervisory changeover switch is in Local position.

b) Local/Remote Changeover Switch in Remote Position.

i) The ACCB cannot be closed or opened using the Trip/Normal/Close switch at the ACCB.

ii) It is possible to close and open the ACCB from the rectification control and protection equipment panel using the Close and Open pushbuttons when the Local/Supervisory changeover switch is at Local. The signals from SCADA are ineffective.

iii) It is possible to close and open the ACCB from the SCADA when the Local/Supervisory changeover switch is at Supervisory. The Close and Open pushbuttons on the rectification control and protection equipment panel are ineffective.

5.3 Protection

5.3.1 General The operation of most of the protective devices shall cause the ACCB and the DCCB to trip. Abnormal conditions that could endanger the rectifier if it was returned to service shall also cause the rectifier to lock out, ie it shall remain unavailable for service until an operator attends the substation and resets the Lockout relay.

White LED indicators of minimum diameter 10 mm shall be provided on the rectification control and protection panel for indication of each fault condition that causes the rectifier to lock out, together with an identical common LED indicator to indicate that the rectifier is locked out. A pushbutton shall be provided locally for Lockout Reset. All Lockout circuits shall be designed for initiation by closure of the protective device contact. (In following sections “LED” shall be taken to mean “LED indicator”).

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Refer to EP 19 00 00 02 SP, Protection System Requirements for the High Voltage Network for details of protection relay requirements.

The following alarm signals indicating operation of protective devices shall be wired to the terminal block for extension to the SCADA RTU:

• Individual Protection Relay Elements • Trip Supply Fault. • Rectifier Lockout. • Breaker Fail Protection Operated. • Breaker Fail Protection Fault. • ACCB Alarms (eg: gas low pressure, spring charge etc)

The following alarm conditions shall lock out the rectifier and generate the Rectifier Lockout alarm signal:

• Breaker Fail Protection. • DC Reverse Current. • Rectifier Frame Leakage. • Transformer Buchholz (Gas). • Transformer Buchholz (Oil). • Spare Protection Trip Circuit. • DC Reactor Overpressure. (This condition shall trip the DCCB but not the ACCB).

Refer to Section 6.9 regarding logic of these alarm signals.

All the protective equipment shall be effective with the Local/Supervisory and Local/Remote changeover switches in any position, except that it is not mandatory that the DCCB trip when the former switch is at “Local” for fault conditions “Instantaneous Overcurrent and Earth Fault” and “Busbar Zone Fault”. A further exception is that the DCCB must not trip when the former switch is at “Local” and the negative isolator is opened.

A summary of the protection operations is given in the table below, with the detailed requirements covered in further clauses below.

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Protective Device ACCB DCCB Lockout Alarm Indication 1

AC Instantaneous Overcurrent and Earth Fault (primary & backup) Trip Trip 2 No Local only

Breaker Fail Protection Fault No effect No effect No Supervisory

DC Reverse Current Trip Trip Yes Lockout

Negative Isolator Accessed No effect Trip No No indication

Negative Isolator Opened No effect3Trip when Supervis.

SelectedNo

Local indication of status only.

Rectifier Frame Leakage Trip Trip Yes Lockout

DCCB Frame Leakage Trip Trip No Local only

Transformer Buchholz (Gas) Trip Trip Yes Lockout

Transformer Buchholz (Oil) Trip Trip Yes Lockout

Spare Lockout Circuit Trip Trip Yes Lockout

DC Reactor Overpressure No effect Trip Yes Lockout

Rectifier Unit Protection Trip Trip Yes Lockout

Trip Supply Failure No effect No effect No Supervisory

Busbar Zone Trip Trip 2 No No

ACCB Alarms No effect No effect No Supervisory

Table 1

Note:

1. Local only: Local individual indication only.

Lockout: Local individual indication + local Lockout indication + SCADA indication of Lockout.

Supervisory: SCADA individual indication.

2. DCCB need not trip with Local/Supervisory changeover switch at Local.

3. Closure of ACCB possible only when Local Close at ACCB selected.

5.3.2 Instantaneous Overcurrent and Earth Fault Refer to EP 19 00 00 02 SP, Protection System Requirements for the High Voltage Network for details of protection relay requirements.

The operation of this protection (primary and backup) shall cause the ACCB to trip but shall not cause the rectifier to lock out. The DCCB shall also trip if Supervisory mode is selected at the Local/Supervisory changeover switch.

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5.3.3 Breaker Fail Refer to EP 19 00 00 02 SP, Protection System Requirements for the High Voltage Network for details of breaker fail requirements. A breaker fail operation shall energise the associated buszone multi-trip relay and an alarm signal shall be wired to the terminal block for extension to the RTU.

5.3.4 DC Reverse Current The rectifier DCCB will detect reverse current flow from the DC busbar to the rectifier and trip instantly by its own mechanism. This will result in relay 54R picking up due to proprietary circuitry on the DCCB. A contact of 54R shall be used to initiate lockout of the rectifier, with consequent opening of the ACCB and de-energisation of the DCCB auxiliary closing circuitry.

The operation of this protection shall be indicated locally by a white LED and the common Lockout LED. The rectifier shall remain locked out and the LED’s lit until the local Lockout Reset pushbutton is pressed. (Relay 54R should reset when the DCCB auxiliary closing circuitry is de-energised – refer above paragraph).

5.3.5 Rectifier Unit Protection This protection scheme is not specified in EP 19 00 00 02 SP, Protection System Requirements for the High Voltage Network, as the scheme had not yet been implemented at the time of publication.

Rectifier unit protection shall comprise a relay that compares the primary current in each phase into the rectifier transformer with the DC output current from the rectifier. The scheme shall be de-sensitised to allow for the effect of the different transformer tap positions and also current bled off to the auxiliary transformer. The scheme shall be as sensitive as possible while providing a margin to ensure correct grading with the auxiliary transformer fuses. Operating time should be as low as possible, consistent with the grading requirement.

The operation of this relay shall cause both the ACCB and the rectifier DCCB to trip and the rectifier to lock out. The operation shall also be indicated locally by a white LED and the common Lockout LED.

The rectifier shall remain locked out and the LED’s lit until the protection relay resets and the local Lockout Reset pushbutton is pressed.

The representative schematics do not show this protection scheme or the CT’s for it.

5.3.6 Negative Isolator Accessed Where the negative isolator is placed within its own compartment inside the rectifier power cubicle with a separate lockable door, an attempt to access the operating mechanism of the isolator will result in opening of an interlock contact. This shall result in the transfer of a failsafe interlock signal to the rectification control and protection equipment which shall cause the rectifier DCCB to trip but shall not cause the rectifier to lock out.

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5.3.7 Negative Isolator Opened The negative isolator will be fitted with a normally-open and a normally-closed auxiliary switch. The former contact shall be followed by a relay (89GR on the Appendix A schematics) in the rectification control and protection equipment which is energised whenever the isolator is closed. If the isolator is opened, a contact of relay 89GR shall trip the DCCB if Supervisory mode is selected at the Local/Supervisory changeover switch. Opening of the negative isolator shall not cause the rectifier to lock out. A second contact of the relay shall be wired in the closing circuit of the ACCB so that when the isolator is open the ACCB cannot be closed, except manually at the ACCB.

The normally-closed contact of the negative isolator and a normally-open contact of relay 89GR shall be used to produce local LED indications Negative Isolator Open and Negative Isolator Closed respectively, in accordance with Section 5.2.3.

5.3.8 Rectifier Frame Leakage A protective device is provided in the rectifier power cubicle for the rectifier frame leakage protection. Operation of this device shall cause both the ACCB and the rectifier DCCB to trip and the rectifier to lock out.

The operation of this protection shall be indicated locally by a white LED and the common Lockout LED. The rectifier shall remain locked out and the LED’s lit until the relay resets and the local Lockout Reset pushbutton is pressed.

5.3.9 DCCB Frame Leakage Terminals shall be provided with the rectification control and protection equipment for receipt of a “DCCB Frame Leakage” signal from a remote Common Circuits Panel which will be provided by others. Closure of the signal contact (86A1-1, 86A2-1 or 86A3-1 depending on which rectifier is under consideration) shall cause both the ACCB and the rectifier DCCB to trip and closing of the ACCB and the rectifier DCCB to be inhibited until the external device is reset. Circuitry within the Common Circuits Panel is shown on sheets 5 and 8 of the representative schematics.

Operation of this protection shall be indicated locally by a white LED.

5.3.10 Transformer Buchholz A gas and oil actuated relay of the Buchholz type is provided on the rectifier transformer. The relay will be equipped with two elements: one operating in the event of a surge in the oil and the other when gas accumulates slowly within the transformer. For each element, a trip contact will be provided.

The operation of either of these devices shall cause both the ACCB and the rectifier DCCB to trip and the rectifier to lock out. Their operation shall also be indicated locally by individual white LED’s and the local Lockout LED.

The rectifier shall remain locked out and the LED’s lit until the Buchholz contact resets and the local Lockout Reset pushbutton is pressed.

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5.3.11 DC Reactor Overpressure Terminals shall be provided with the rectification control and protection equipment for receipt of the “DC Reactor Overpressure” signal from the remote Common Circuits Panel mentioned above. Closure of the signal contact shall cause the rectifier DCCB to trip and the rectifier to lock out. The ACCB shall remain closed to ensure continuity of the substation auxiliary supplies, which are derived from the rectifier transformer output.

Operation of this protection shall be indicated locally by a white LED and the common Lockout LED. The rectifier shall remain locked out and the LED’s lit until the signal contact opens and the local Lockout Reset pushbutton is pressed.

5.3.12 Trip Circuit Supply Failure The trip circuit supervisory relay shall indicate a failure of the supply to the ACCB tripping circuits. The operation of this device shall not cause the ACCB or the rectifier DCCB to open, but an alarm signal shall be extended to the SCADA RTU.

Trip circuit wiring shall be taken right to each tripping relay’s terminals, looping from relay to relay, and the supervisory relay shall be connected at the very end of the trip circuit.

5.3.13 Busbar Zone A busbar zone protection relay may be fitted to the bus-section circuit breaker on the switchboard.

Operation of this relay shall cause the ACCB to trip but shall not cause the rectifier to lock out. The DCCB shall also trip if Supervisory mode is selected at the Local/Supervisory changeover switch.

5.3.14 HV ACCB Alarms The HV ACCB will have several alarms (eg. low gas pressure, spring charge, motor alarms).

These alarms shall extend to the SCADA RTU via terminals which shall be provided with the rectification control and protection equipment.

5.3.15 Rectifier Transformer Alarms Terminals shall be provided with the rectification controls and protection as shown on Sheet 7 of the representative schematic diagrams for transfer of the following alarms from the rectifier transformer to the SCADA RTU:

• Top oil temperature alarm • Top oil temperature critical alarm • Winding temperature alarm • Winding temperature critical alarm • Overpressure alarm • Tapchanger fault

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5.3.16 Spare Protection Trip Circuit Hardware and circuitry shall be provided for receipt of a future signal from a remote protective device. The signal shall comprise contact closure on fault.

The signal shall cause both the ACCB and the rectifier DCCB to trip and the rectifier to lock out.

A white LED on the rectification control and protection panel shall indicate the alarm condition and the common Lockout LED shall light. The rectifier shall remain locked out and the LEDs lit until the protective device contact resets and the Lockout Reset pushbutton is pressed.

In addition to tripping the ACCB via the Lockout relay 86, a contact of the spare circuit auxiliary relay SPX shall be wired in the ACCB trip circuit, as shown on Sheet 3 of the representative schematic diagrams included at Appendix A.

5.3.17 Current Transformers Three sets of 3-phase current transformers will be provided with the rectifier ACCB for the instantaneous overcurrent and earth fault protection, overcurrent and earth fault breaker fail protection and busbar zone differential protection.

Refer to EP 19 00 00 02 SP, Protection System Requirements for the High Voltage Network for details of current transformers, secondary wiring and test link and test block requirements.

5.4 Metering

5.4.1 DC Ammeter and Voltmeter The following 150 mm square analogue 0-20 mA transducer meters shall be provided on the front of the rectification control and protection panel:

• DC ammeter 0 - 5000 A with a resolution of 100 A. • DC voltmeter 1000 - 2000 V with a resolution of 20 V.

Both meters will receive input signals from transducers in the rectifier power cubicle. Provide two terminals near each meter for continuation of 0-20 mA negative and cable screen, as shown on Sheet 8 of the schematic diagrams (see Section 3.3).

5.4.2 Primary Current Transducer A current transducer shall be provided with the rectification control and protection equipment to allow monitoring of the rectifier transformer primary current by SCADA. The transducer shall be connected in series with B phase CT signal to the instantaneous overcurrent and earth fault protection.

Refer to EP 19 00 00 02 SP, Protection System Requirements for the High Voltage Network for details of approved current transducers.

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6 Interface Equipment

6.1 General All equipment listed in this section interfaces with the rectification control and protection equipment. Refer to Figure 3 in Section 5.1 of this document.

6.2 Remote Alarm and Indication Contacts (Inputs) All alarm and indication contacts on the rectifier transformer, rectifier and Common Circuits Panel which produce signals to the rectification control and protection equipment will be suitable for making and breaking up to 100 mA in a 120 V DC circuit. The contacts will be suitable for switching relay coils and similarly inductive loads.

Design of the rectification control and protection equipment shall ensure that these contacts operate comfortably within their rating.

6.3 Control Supply A battery supply is provided for the control, protection and alarm circuits. This supply is used for closing and tripping the circuit breakers in the substation and also for the indicating lights and SCADA system. Unless otherwise stated the battery supply will be 120 V DC.

All rectification control and protection components shall be rated for the nominal battery supply voltage and shall be capable of continuous operation with voltage variations as per RailCorp standard EP 00 00 00 15 SP “Common Requirements for Electric Power Equipment”.

6.4 Rectifier Power Cubicle Refer to Sections 5.3.6, 5.3.7, 5.3.8 and 5.4.1.

6.5 Rectifier Transformer Refer to Sections 5.2.4 and 5.3.10.

6.6 AC Circuit Breaker The ACCB is self-contained and has its own control equipment and circuitry. Refer to Sections 5.2.6, 5.3.2, 5.3.3, 5.3.17 and 5.3.14

6.7 DC Circuit Breaker A rectifier DCCB that is single pole, polarised and has been designed specifically for use on 1500 V DC traction duty will be installed. The DCCB is self-contained and has its own control equipment and circuitry. It will normally be set at approximately 1000 A reverse current but can be set up to 3000 A. Refer to Section 5.3.4. The terminal box connector designations are standardised and are tabulated in Appendix C.

6.8 Common Circuits Panel Refer to Sections 5.3.9 and 5.3.11.

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6.9 SCADA The SCADA RTU outputs which energise relay 305A (Close ACCB) and 306A (Open ACCB) are able to source 0.5 A maximum at 120 V DC. The signals are of 1 second duration.

Indications and alarms to the RTU must be maintained, 120 V DC positive signals. Alarm conditions shall be extended by opening of the contact behind this voltage so that it drops to 0V, except that extension of the Breaker Fail Protection Operated alarm shall be by contact closure and rise in voltage to 120 V DC.

Refer to schematic diagram Sheet 7 (see Section 3.3).

7 Implementation

7.1 Options Control and protection of the rectification process may be achieved by discreet, hard-wired components or by a software-based controller. The equipment may be housed in a stand-alone, indoor cubicle, or in the 33 kV ACCB panel if space permits, or in a combination of both.

7.2 Implementation by Discrete, Hard-wired Components Drawings EL 0228201 to EL 0228208 (see Section 3.3) as an example of such an implementation. Sheets 2 and 3 are drawn for an ACCB that is outdoor, remote from the rectification control and protection equipment, and which has a Local/Remote selector switch. Refer to Section 5.2.6.

8 Integrated System Support Requirements

8.1 Integrated Support Objectives The Tenderer must 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 rectification control and protection equipment. This information includes:

• Specifying Maintenance Requirements • Spares Support • Operation and Maintenance Manuals • Training, and • Support Equipment and Tooling

8.2 Equipment Supplier Deliverable The Integrated Support requirements are a significant deliverable in the procurement of new rectification control and protection equipment. Manuals, training, documentation and other support deliverables to be supplied by the Contractor shall be in accordance with RailCorp Standard EP 00 00 00 12 SP “Electrical Power Equipment - Integrated Support Requirements”.

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9 Testing Testing shall be performed in accordance with RailCorp standard specification EP 00 00 00 15 SP “Common Requirements for Electric Power Equipment”.

10 Data Set Associated With The Equipment Data shall be supplied by the Contractor in accordance with RailCorp standard specification EP 00 00 00 15 SP - “Common Requirements for Electric Power Equipment”. The following breakdown of Schematic Diagram sheets is provided for guidance. Specific implementations may require a degree of variation from this arrangement. However, the sheets shall be organised in this way to the degree practicable:

Sheet 1 – Legend / Equipment List

Sheet 2 – Main and CT Circuits

Sheet 3 – ACCB Controls

Sheet 4 – DCCB Controls

Sheet 5 – Protection Lockout

Sheet 6 – Status & Alarm Indication

Sheet 7 – SCADA Interface

Sheet 8 – Analogue Signals & Reactor Alarms

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Appendix A Technical Schedule The information listed in this Technical Schedule shall be supplied by the Tenderer, at Tender stage, for each set of rectification control and protection equipment. Manufacturers’ pamphlets and data sheets shall be included to help define the offer.

Reliability Data: Use separate sheet if necessary.

Failure Modes (for Early, Normal Life, & Wear Out periods)

a) .………………............

b) .………………............

c) .………………............

Mean Operating Hours Between Failures:

a) .………………............

b) .………………............

c) .………………............

Time to Repair:

a) .………………............

b) .………………............

c) .………………............

Departures from Standard

Are there any departures from the requirements of this standard? * Yes/No

If Yes, provide details

.……………….............……………….............……………….............……………….............……………….............……………….............……………….............……………….............……………….............……………….............……………….............……………….............………

Tender Information Tenderer Supplied Information

Proposed location of rectification controls and protection. Refer Section 7.1 Options

Dimensions of stand-alone cubicle, if applicable

Proposed means of implementation. Refer Section 7.1 Options

Make and model of software-based controller, if applicable

Make and model of control relays

Make and model of Rectifier Unit Protection. Refer Section 5.3.5 Rectifier Unit Protection


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Appendix B DCCB Terminal Box Connections

Connector Designations

2Wire Size mm Wire Stranding (strands/dia) (mm) Function

A 1.5 (30/0.25) Control Close +VE

K 4 (56/0.30) Close and Hold Coils +VE

M 4 (56/0.30) Control, Close and Hold Coils -VE

N 1.5 (30/0.25) Control Hold +VE

C, S 1.5 (30/0.25) N/O auxiliary contact

D, T 1.5 (30/0.25) N/C auxiliary contact

E, F, G 1.5 (30/0.25) N/O, Common, N/C auxiliary conts

H, I 1.5 (30/0.25) N/O auxiliary contact

J, R 1.5 (30/0.25) N/O Reverse Current alarm contact

L 1.5 (30/0.25) Not connected to DCCB

U, V 1.5 (30/0.25) N/O auxiliary contact

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Appendix C Request for Tender Checklist Application

The following material is for guidance in the preparation of a Request for Tender for this type of equipment. This checklist itself is not intended to directly form part of any contract.

Information to be supplied to the Tenderer

• Details of the ACCB including details of current transformers. • Details of the DCCB.

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Appendix D Requirements for Technical Aspects of Tender Evaluation

Evaluation of tenders

Tender submissions will be evaluated based on a number of criteria. One constant criterion is compliance with this specification. The Chief Engineer Electrical requires that persons evaluating the technical aspects of this tender have sufficient technical competence for the task.

Tender evaluation committees shall forward details of persons evaluating the technical aspects of the tender to the Chief Engineer Electrical for concurrence. This will normally be in the form of an email and is to include sufficient detail of the tender and the person to enable the Chief Engineer Electrical to satisfy themself of the merits of the evaluating person. A minimum of 4 weeks notice is required prior to the evaluation of the Tenders.

The Chief Engineer Electrical will advise within 5 working days only if the person is considered technically unsuitable for the technical evaluation.

Acceptance of product

A number of the specifications require acceptance of product at both the factory and at site. The purchaser is to advise the Chief Engineer Electrical the details of the person carrying out the acceptance testing for the concurrence of the Chief Engineer Electrical. A minimum of 4 weeks notice is required prior to the evaluation of the acceptance testing.

The Chief Engineer Electrical will advise only if the person is considered unsuitable for the acceptance testing.

The Chief Engineer Electrical reserves the right to nominate a representative to review and/or attend such acceptance.

Record Keeping

Where product is purchased against this specification, the Chief Engineer Electrical requires that relevant detail be provided so that it can be logged against this specification.

For RailCorp purchases, all records are recorded in Ariba.

Where this specification is utilised by parties external to RailCorp (Alliance parties, etc) then copies of all relevant technical information and evaluation shall be forwarded to the Chief Engineer Electrical for filing against the specification. In addition copies of selected commercial information pertaining to the ongoing support of the product as follows is also required.

• Warranty details • Spare parts and associated availability • Product support information.

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EP 03 02 00 01 SP - Controls and Protection for ......ST v1.0, 25/05/2018 CONTROLS & PROTECTION FOR...

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