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PROTECTION AND CONTROL REQUIREMENTS FOR HEYWOOD TERMINAL STATION (HYTS) INTERFACE

PREPARED BY: Connection Services

VERSION: 3.0

RELEASE DATE: 4 October 2013

Document: PCR / HYTS /17

Issued WITHOUT Settings

PROTECTION AND CONTROL REQUIREMENTS

Version Release History

Version

Date Prepared by

Reviewed by

Approved By

Changes

1.0 1 May 2013 F. Ma

E. Twining / M. Redpath

A. Dinning

2.0 15 July 2013E.

Twining

M. RedpathA.

Dinning

Modified for inclusion in Augmentation ITT

3.0 4 October 2013

E. Twining

A. DinningA.

Dinning

Added QoSM requirements.

This document has been created by Connection Services, Network Development.

Version 3.0 PCR/HYTS/17 4 October 2013 of 20


Contents

1 Glossary............................................................................................................4

2 General Information...........................................................................................4

3 Interfaces...........................................................................................................5

4 Protection Requirements...................................................................................7

5 Control and Monitoring Requirements...............................................................8

6 Remote Monitoring and Control from TOC and AEMO...................................10

7 Miscellaneous Requirements..........................................................................11



1 GlossaryIn this document, capitalised words or phrases or acronyms not defined in the PCCD, have the meaning set out opposite those words, phrases, or acronyms in Table 1 below.

Table 1: Glossary of terms Term MeaningAPD Portland AluminiumDNSP Distribution Network Service ProviderEAPTS Emergency APD Potline Tripping SchemeMOPS Mortlake Power StationROI Remotely Operated IsolatorsTRTS Tarrone Terminal StationX/R ratio Ratio of reactance to resistance

2 General Information

2.1 Project Description

2.1.1 IntroductionThis document specifies the protection, control and monitoring requirements for the Interface.

2.2 Related DocumentsThis document should be read in conjunction with the documents listed in Table 2.

Table 2: Project Documents Document Number Document Name

PCR/HYTS/18 Protection and Control Requirements for Heywood Terminal Station (HYTS) Augmentation

PCR/QOSM/1 Protection and Control Requirements for Replacement of Quality of Supply Monitors.Primary Functional Requirements for Heywood Terminal Station (HYTS) InterfacePrimary Functional Requirements for Heywood Terminal Station (HYTS) Augmentation

2.2.1 InterdependciesImplementation of the Project requires the completion of the Augmentation and Interface in accordance with the PFRs and PCRs for each.

The PCRs and PFRs referred to in Table 2 are required in addition to the PCRs described in this document.



2.3 Plant operating conditionsExpected system conditions have been included to allow the design of the secondary equipment and for the preparation of secondary settings. These conditions are outlined in Table A-7 to Table A-9

The fault levels and X/R ratios shown in Error: Reference source not found apply after the Project is completed.

The plant loading levels shown in Table A-8 apply after the Project is completed and represent peak loading under worst case prior outage and single contingency conditions.

SPI PowerNet must consult AEMO if proposed modifications to secondary equipment impose thermal or setting limitations lower than primary plant Winter ratings.

SPI PowerNet must ensure that protection and control systems and settings are implemented such that they will not operate for voltage conditions that the plant must ride through. These voltage conditions are set out in Table A-9.

2.4 General requirementsIf SPI PowerNet provides or modifies any of the following facilities as part of the project in accordance with this PCR, they must be duplicated and/or be provided with an adequate measure of physical and electrical segregation. The design must avoid common points of failure between the duplicated facilities:

Batteries used for protection, control and communications purposes;

Battery chargers;

Auxiliary supplies;

Protection panels;

Circuit breaker trip coils;

Control cables containing X and Y protection quantities, including:

o Trip circuits to CBs;

o CT and VT secondaries;

o Communication systems; and

o Transformer quantities used for protection purposes.

Wherever available, independent physical routes must be used for control cables. Where independent physical routes are not available, control cables must be secured to opposite sides of the route for the length of the common physical route.

3 InterfacesProtection, monitoring and control signals must be exchanged at the Interface. The physical location of the Interface will be specified in the connection agreement between SPI PowerNet and TNSP. This document specifies the functional obligations on either side of the interface.

3.1 Primary InterfacesThe primary interfaces are outlined in the document titled: “Primary Functional Requirements for Heywood Terminal Station Interface”.



3.2 Secondary InterfacesThis document specifies the minimum requirements for the exchange of secondary signals and quantities through the Interface.

3.2.1 Secondary signals and quantities at interfacesSecondary signals and quantities exchanged through the interfaces may includethose detailed in Table 3.

Table 3: Secondary Signals and Quantities Class of signal or quantity Type of signal or quantityProtection trips

interaction such as fibre optic communication links between Protection devices

Protection device inputs such as binary, current and voltagePlant monitoring and controls controls, status indications, alarms and instrumentationMonitoring and controls for remote system operation

controls, status indications, alarms and instrumentation

System monitoring (HSM, QOSM) inputs such as current and voltage files for transmission remotely

Special control schemes (emergency control schemes)

controls, status indications, alarms and instrumentation required locally for correct operation

inputs received from remote locations outputs transmitted remotely

Auxiliary supplies 240V and 415 V ac supplies Protection, control and communications dc supplies

3.3 Obligations at Interface PointsTNSP and SPI PowerNet must exchange signals at the Interface to achieve the functional requirements specified in PCR/HYTS/17 and PCR/HYTS/18. More particularly:

SPI PowerNet must:

Provide the secondary signals and quantities, identified in PCR/HYTS/17 for Interface requirements at the Interface for use by TNSP;

Utilise secondary signals and quantities, identified in PCR/HYTS/17 for Interface requirements, provided by TNSP at the Interface.

Transmit signals and quantities, received from TNSP at the Interface, to appropriate sites; and

Transmit signals and quantities to TNSP at the Interface;

TNSP must:

Provide the secondary signals and quantities, identified in PCR/HYTS/18 for the Augmentation, at the Interface for use by SPI PowerNet; and

Utilise the secondary signals and quantities, identified in PCR/HYTS/18 for the Augmentation provided by SPI PowerNet at the Interface.



4 Protection Requirements

4.1 General requirementsSPI PowerNet must coordinate with TNSP to ensure the design of the protection systems on the Augmentation seamlessly integrates with the protection systems on the remainder of plant at HYTS.

SPI PowerNet must ensure that its protection systems comply with the requirements detailed in Table 4.

Table 4: General Protection Requirements Requirement Each protection system in a duplicated protection scheme (designated “X” and “Y” throughout this

document) must be of different manufacturer or have differing operating principles. If this is not possible then permission from AEMO must be obtained to implement the proposed arrangement.

All circuit breaker backup and dead zone trips must be independently initiated by X and Y primary protection.

Protection times specified apply to both X and Y protection schemes. All fault clearance times, including backup/dead zone protection, include circuit breaker operating times,

including (where applicable) those at remote locations. Saturation characteristics of current transformers used for protection purposes must be suitable to meet

the operating requirements of the protection with margins in accordance with good electricity industry practice.

Where new plant is added to the terminal station, that plant must be integrated into all existing protection systems as required.

The fault clearance times referenced throughout this PCR are detailed in Appendix C.

4.2 Interface Protection

4.2.1 Primary Protection SystemsSPI PowerNet must ensure that duplicated primary protection schemes are established to detect faults and initiate trip signals to all circuit breakers to clear a fault within the Victorian Transmission Network.

If a fault occurs within the Interface, SPI PowerNet must ensure that:

all SPI PowerNet owned assets required to operate to clear the fault do operate to clear the fault;

the fault is cleared within the time listed in Row 1 of Table B-20 for a 500 kV fault measured from fault inception;

the fault is cleared within the time listed in Row 2 of Table B-20 for a 275 kV fault measured from fault inception;

if the fault clearance requires the operation of the Augmentation, protection trip signalling is provided to TNSP at the Interface for a 500 kV fault within the time listed in Row 1 of Table B-21 measured from fault inception.

Where trip signals are provided by TNSP at the Interface and operation of the SPI PowerNet owned assets is necessary to clear a fault (while isolating the minimum amount of plant necessary to clear the fault), SPI PowerNet must ensure that all 275 kV assets required to clear the fault operate within the fault clearance time listed in Row 3 of Table B-20 for a 275 kV fault measured from the time the protection signalling is provided.



4.2.2 Backup Protection Systems For all faults detected by the Interface’s primary protection, SPI PowerNet must ensure that the primary protection system that detects the fault initiates the backup/dead-zone protection system associated with the faulty plant.

If a fault occurs that requires the operation of any SPI PowerNet owned assets at HYTS and these assets fail to clear the fault, or the fault has occurred within a dead zone, SPI PowerNet must ensure that:

all SPI PowerNet owned assets required to operate to clear this fault operate to clear the fault within the time listed in:

o Row 4 of Table B-20 for a 500 kV fault;

o Row 5 of Table B-20 for a 275kV fault;

measured from fault inception; and

when 500 kV circuit breaker within the Augmentation is required to clear a fault within the Interface, trip signals are provided to TNSP at the Interface within the time listed in Row 2 of Table B-21 in Appendix C measured from fault inception.

Where trip signals are provided by TNSP at the Interface and the operation of SPI PowerNet owned assets is necessary to clear a fault (while isolating the minimum amount of plant necessary to clear the fault), SPI PowerNet must ensure that all SPI PowerNet owned assets which are required to clear the fault operate within the fault clearance time listed in:



measured from provision of protection trip signalling.

4.2.3 HYTS 275 kV Capacitor Bank ProtectionThe HYTS 275 kV Capacitor Bank protection functions that currently exist for the HYTS 275 kV bus tie circuit breakers are to be transferred to the new 275 kV capacitor bank circuit breaker.

5 Control and Monitoring Requirements

5.1 General requirementsSPI PowerNet must ensure that:

equipment is arranged so that failure of local automatic or remote manual controls cannot prevent operation of the local manual switching controls at HYTS;

interlocking signals (for example voltage measurement or CB status indications) of appropriate security provided at the Interface by TNSP are utilised to prevent asynchronous closure of CBs while Victoria and South Australia are separated; and

controls are implemented for all circuit breakers and ROIs referred to in this document to meet the requirements outlined in Table 5.

Table 5: General Circuit Breaker and ROI Control RequirementsFacility

Local and remote circuit breaker trip (open) and close controls



Facility Circuit breaker local and remote open and closed status indications Circuit breaker alarms as required by CB type and for remote operation Circuit breaker pole (phase) discrepancy (CB to trip and raise alarm on detection of discrepancy) if

required by CB type (e.g., separate mechanism for each phase) All isolators are motorised (Remote Operated Isolators [ROI]) ROI open and close controls (local and remote) ROI open and close operation interlocked with CB and earth switch status ROI local and remote open and closed status indications

5.2 Special Control Schemes

5.2.1 Capacitor Bank Control RequirementsThe existing capacitor bank controls on the HYTS 275 kV bus tie circuit breakers are to be transferred to the new 275 kV capacitor bank circuit breaker. The existing synch check and auto reclose functions are not required for the new 275 kV capacitor bank circuit breaker.

SPI PowerNet must provide the following facilities:

Capacitor Bank Circuit Breaker Control Requirements included in Table A-10; and Capacitor Bank Operating Requirements included in Table A-11.

5.2.2 Emergency APD Potline Tripping Scheme (EAPTS) RequirementsSPI PowerNet must modify EAPTS, as described in PCR/HYTS/14, to incorporate active power flow through the M3 Transformer.

5.2.3 Transformer Tap Changer Control RequirementsSPI PowerNet must upgrade the existing HYTS transformer tap changer control scheme to incorporate the M3 Transformer. Design of the new scheme will need to be co-ordinated with TNSP to achieve regulation of the 275 kV bus voltage. The following modes of operation must be implemented:

Automatic master (M1) – slave (M2) – slave (M3) arrangement when three transformers are operating in parallel;

Automatic master (M2) – slave (M3) arrangement when M1 is out of service.

Automatic / manual independent (M3) arrangement when M1 and M2 are out of service.

5.3 Voltage sourcesSPI PowerNet must ensure that automatic potential selections are available for control and monitoring systems that meet the following requirements:

implement potential sources representing the 275 kV bus from at least two independent voltage sources;

implement automatic potential selection arrangements to provide secure voltage sources for control and monitoring systems;

obtain the potential selections from appropriate and suitably switched (via CB and ROI auxiliary switches) bus and line voltage sources;

potential selector performance requirements listed in Table A-12; and

potential selection requirements listed in Table A-13.



SPI PowerNet may use the existing voltage sources provided they meet the above conditions and also the burdens are within the sources ratings.

5.4 Instrumentation

5.4.1 AccuracyThe total overall errors of measurements must be less than:

1.0% of range for current and voltage measurements, and

2.0% for other measurements.

5.4.2 Instrumentation rangesSPI PowerNet must provide instrumentation as specified in Table B-11.

SPI PowerNet is to receive from HYTS TNSP the instrumentation quantities listed in Table B-12 in at the Interface.

5.5 AlarmsSPI PowerNet must ensure that control and protection alarms are provided for the Interface in accordance with good electricity industry practice, including alarms related to the following:

Protection schemes; communications (including RTU alarms, if required); fire (including transformer fire alarms if applicable); double pole discrepancy; and any other plant alarms or protection and control alarms required for safe and reliable

operation for the types of the connection assets.

5.5.1 Monitoring of capacitor bank harmonic current The existing harmonic alarm relay is to be transferred to the new 275 kV capacitor bank circuit breaker. The existing alarm settings are to be maintained.

6 Remote Monitoring and Control from TOC and AEMOSPI PowerNet must provide or modify facilities at TOC as appropriate for any terminal station quantities that are added or altered as a consequence of the Project, and upgrade to include the required the required remote control facilities. This requirement applies to all plant and controls identified in this document.



6.1 Communications

Table 6: Communication requirementsCommunication requirements Quantities associated with the Interface must be transmitted to AEMOin accordance with AEMO requirements

(refer National Electricity Rules clause S5.2.6). Duplicated communications facilities are required for monitoring and control by TOC, for transmission of data

between HYTS and AEMO and for 275 kV Capacitor Bank protection. Duplication of dc auxiliary supplies to the communications facilities is required to prevent simultaneous loss of

both communications links. (Excludes RTUs) Communications facilities (including RTUs) must meet AEMO requirements in respect of scan rates, update

times, RTU turnaround times etc.

6.2 Remote Monitoring and Control SignalsSPI PowerNet must communicate between HYTS and TOC the quantities identified in Table A-16, which includes those made available at the Interface.

SPI PowerNet must make the remote monitoring and control quantities listed in Table A-17 available to AEMO. Remote control from AEMO is to be carried out through direct operator communications with TOC.

SPI PowerNet must make the remote monitoring and control quantities listed in Table A-18 in Appendix B available at the Interface for TNSP.

SPI PowerNet is to receive the remote monitoring and control quantities listed in Table A-16 at the Interface from TNSP.

7 Miscellaneous Requirements

7.1 AC SuppliesIf the existing AC supplies are capable of suppling the extended facilities, no new AC supply is required.

If new AC supplies are required, two independent AC supplies are required. Acceptable sources include the following:

Transformer tertiary windings;

Feeder supplies from DNSPs. Where two feeder supplies are used, these shall preferably be from different substations or where this is not practicable, from different buses from the same substation; and

Diesel generator. Portable generators are acceptable provided the portable units can be connected and operated before expiration of battery service. If a diesel generator is included in the AC supplies, the diesel generation should be capable of operating for at least 12 hours as per the existing diesel generation at HYTS.

SPI PowerNet must submit the AC Supply design to AEMO for approval.

7.2 DC SuppliesIf the existing DC supply capacity is capable of supplying the extended facilities with the service described in Section 7.2.2, no additional DC supply is required. If new DC Supplies are required, SPI PowerNet must ensure that the provided DC supplies are adequate for all of the SPI PowerNet owned assets at HYTS.



7.2.1 DC Supply RequirementsDC supplies will be provided from batteries. Use of external DC supplies is not acceptable.

The main batteries are required to be duplicated batteries

Communication supplies must be duplicated and may be provided from either separate batteries or from DC – DC converters.

Segregation of X and Y supplies to equipment is required.

7.2.2 DC Supply battery capacityIf diesel generation is provided as an alternative AC source the following DC battery capcities are required:

Battery for X & Y supplies: 5 hours plus 2 open and 1 close operations for each CB including 2 open and 1 close operation for each ROI

Communication Batteries: 5 hours Alternatively, if diesel generation is not provided the following DC battery capacities are required:

Battery for X & Y supplies: 8 hours plus 2 open and 1 close operations for each CB including 2 open and 1 close operation for each ROI

Communication Batteries: 10 hours

7.3 Quality of Supply Monitoring (QoSM)SPI PowerNet mus provide and install QoSM facilities to monitor the the following quantities:

500 kV 3-phase (R, W, B) busbar voltages;

500 kV 3-phase (R, W, B) transformer currents (provided at the Interface);

275 kV 3-phase (R, W, B) busbar voltages; and

275 kV 3-phase (R, W, B) transformer currents (provided at the Interface)

in accordance with the requirements of PCR/QOSM/1.



Appendix A: Tables

Table A-7: Fault LevelsPlant Maximum Fault Levels Minimum Fault Levels

3ph (kA) 1ph-g (kA)

X/R ratio

3ph (kA) 1ph-g (kA)

X/R ratio

HYTS 500 kV bus 50 50 35 TBA TBA TBAHYTS 275 kV bus 40 40 30 TBA TBA TBA

Table A-8: Plant LoadingPlant Load (kA)500kV Circuit breakers TBA275 kV Circuit breakers TBA275 kV Capacitor bank circuit breaker TBA

Table A-9: Voltage ConditionsIn addition to the requirements of Figure S5.1a.1 in the Rules (for nominal voltage), Plant will be exposed to the following voltage profiles:Voltage Level – 500 kV Buses Duration

565 kV 30 minutesVoltage Level – 275 kV Bus Duration

311 kV 30 minutes

Table A-10: Capacitor Bank 275 kV Circuit Breaker Control RequirementsCircuit Breaker(s):275 kV CB ControlRemote trip (initiated by 500/275 kV Transformer protection) RequiredPoint on Wave Swiching interlock and interlock bypass (including remote control and status indications)

Required

Automatic voltage switching controls (including remote on/off controls and status indications) and blocking

Required

Time switch control Not required

Note :Capacitor bank control settings are as per existing settings.



Table A-11: Capacitor bank operating requirementsAutomatic and manual Close operations for capacitor bank CB, must be blocked at the following times: during and after operation of capacitor bank protection; during and after operation of bus protection for the bus to which the capacitor bank is to be connected; when insufficient time has elapsed for discharge of the capacitor bank (subsequent to it being switched

off). during failure of capacitor bank CB point-on-wave switching facilities.A local voltage blocking device must be used to inhibit automatic switching of voltage support plantLocal and remote manual switching must NOT be blocked by voltage blocking.Blocking of capacitor bank automatic switching must be instantaneous, but the local and remotely transmitted status indications must be self-resetting and time delayed

Table A-12: Potential Selector Performance RequirementsPerformance requirement Time

Drop out time on potential selection relays used for DSMs (and later HSMs)

Not less than 400 milliseconds

Changeover time between potentials Not greater than one second

Table A-13: Potential Selection RequirementsPlant Preferred source Alternate source Additional alternate

source (if possible)275 kV Bus Line CVT Line CVT (switched)

Table A-14: Instrumentation to be provided by SPI PowerNet Plant Quantity Required ranges

M1, M2 & M3Transformer Summation

Active power TBAReactive power TBA

275 kV capacitor bank Exiting quantities (via new connection)

Existing ranges



Table A-15: Instrumentation Quantities to be provided by TNSP to SPI PowerNet at the InterfacePlant Quantity Required ranges

M3 Transformer Voltage (3-phase) HV side 0 – 600 kVVoltage (3-phase) MV side 0 – 340 kVCurrent (3-phase) HV side TBACurrent (3-phase) MV side TBA

Active power TBAReactive power TBA

Tap position TBATop oil temperature TBA

Winding temperature TBAFrequency 45-55 Hz

M3 Transformer / No 1 500 kV Bus CB

M3 Transformer / No 2 500 kV Bus CB

Current (3-phase) 0 – TBA kA



Table A-16: Remote Monitoring and Control Quantities to be communicated to and from TOCControls

M3 Transformer / No 1 500 kV Bus CB open M3 Transformer / No 2 500 kV Bus CB open M3Transformer / No 1 500 kV Bus ROI open / close M3 Transformer / No 2 500 kV Bus ROI open / close 275 kV Capacitor Bank CB and ROIs open / close SESS No 1 275 kV Line / 275 kV Bus ROI open / close SESS No 2 275 kV Line / 275 kV Bus ROI open / close

Status Indications M3 Transformer / No 1 500 kV Bus CB and ROIs open / closed M3 Transformer / No 2 500 kV Bus CB and ROIs open / closed M3 Transformer 275 kV ROI open / close M3 Transformer connection to 500 kV bus tie (connected / disconnected) M1 Transformer 500 kV ROI open / closed M2 Transformer 500 kV ROI open / closed 275 kV Capacitor Bank CB and ROIs open / closed SESS No 1 275 kV Line / 275 kV Bus ROI open / closed SESS No 2 275 kV Line / 275 kV Bus ROI open / closed Position of all Earth Switches

Alarms Indications of malfunction or unavailability of all or any part of facilities utilised by HYTS RTUs and other communications facilities dc auxiliary supplies Alarms relating to protection or devices relating to protection Fire (including transformer fire alarms where applicable) Other alarms in accordance with established TOC practice

Instrumentation Quantities Refer Table A-14 and Table A-15



Table A-17: Remote Monitoring and Control Quantities to be communicated to and from AEMOControls (via TOC operator communications)

M1 Transformer / No 1 500 kV Bus ROI open / close M2 Transformer / No 2 500 kV Bus ROI open / close 275 kV Capacitor Bank CB and ROIs open / close SESS No 1 275 kV Line / 275 kV Bus ROI open / close SESS No 2 275 kV Line / 275 kV Bus ROI open / close

Status Indications M1 Transformer 500 kV ROI open / closed M2 Transformer 500 kV ROI open / closed 275 kV Capacitor Bank CB and ROIs open / closed SESS No 1 275 kV Line / 275 kV Bus ROI open / closed SESS No 2 275 kV Line / 275 kV Bus ROI open / closed Position of all Earth Switches owned by SPI PowerNet

Alarms Indications of malfunction or unavailability of all or any part of HYTS plant and facilties owned by

SPI PowerNet. RTUs and other communications facilities owned by SPI PowerNet dc auxiliary supplies owned by SPI PowerNet Alarms relating to protection or devices relating to protection owned by SPI PowerNet Fire (including transformer fire alarms where applicable) associated with plant /facilities owned by

SPI PowerNet Other alarms ) associated with plant /facilities owned by SPI PowerNet in accordance with

established TOC practice

Instrumentation Quantities Refer Table A-14



Table A-18: Remote Monitoring and Control Quantities provided by SPI PowerNet to TNSPControls

N/A

Status Indications TRTS / APD No 1 500 kV Line CB and ROI open / closed MOPS No 2 / APD No 2 500 kV Line CB and ROI open / closed M1 Transformer 500 kV ROI open / closed M2Transformer 500 kV ROI open / closed M1Transformer / SESS No 1 500 kV Line CB and ROI open / closed M2 Transformer / SESS No 2 500 kV Line CB and ROI open / closed SESS No 1 275 kV Line / 275 kV Bus CB and ROIs open / closed SESS No 2 275 kV Line / 275 kV Bus ROIs open / closed 275 kV Capacitor Bank CB and ROIs open / closed Position of all Earth Switches owned by SPI PowerNet

Alarms Indications of malfunction or unavailability of all or any part of HYTS plant and facilities owned by

SPI PowerNet. RTUs and other communications facilities dc auxiliary supplies remote tap position indication (TPI) for No 1 & 2 500/275 kV transformers Fire (including transformer fire alarms where applicable) Other alarms in accordance with established TOC practice

Instrumentation M1 Transformer active and reactive power M1 Transformer tap position M2Transformer active and reactive power M2 Transformer tap position TRTS No. 1 500 kV Line active and reactive power MOPS No. 2 500 kV Line active and reactive power APD No. 1 500 kV Line active and reactive power APD No. 2 500 kV Line active and reactive power SESS No. 1 275 kV Line active and reactive power SESS No. 2 275 kV Line active and reactive power HYTS No 1 500 kV bus voltage HYTS No 2 500 kV bus voltage HYTS 275 kV bus voltage



Table A-19: Remote Monitoring and Control Quantities provided by TNSP to SPI PowerNetControls

M3 Transformer / No 1 500 kV Bus CB open M3 Transformer / No 2 500 kV Bus CB open

Status Indications M3 Transformer / No 1 500 kV Bus CB and ROIs open / closed M3 Transformer / No 2 500 kV Bus CB and ROIs open / closed M3 Transformer 275 kV ROI open / close M3 Transformer connection to 500 kV bus tie (connected / disconnected) Position of all Earth Switches

Alarms Indications of malfunction or unavailability of all or any part of HYTS plant and facilities owned by

TNSP. RTUs and other communications facilities dc auxiliary supplies Fire (including transformer fire alarms where applicable) Other alarms in accordance with established TOC practice

Instrumentation Refer Table A-15



Appendix B: Maximum Fault Clearance TimesTable B-20: Protection Timing Requirements

Row Clearance Time (milliseconds)1 80 from the inception of fault2 100 from the inception of fault3 50 from provision of protection signalling4 175 from the inception of fault5 250 from the inception of fault6 50 from the receipt of the signal from the HYTS TNSP7 50 from the receipt of the signal from the HYTS TNSP

Table B-21: Protection Signalling Timing RequirementsRow Signalling Time (milliseconds)

1 40 from the inception of fault2 125 from the inception of fault


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