1. Project Description

Transcription

1 Page No: 1 of Project Description 1.1 Introduction This document outlines protection, monitoring and control requirements for the shared network assets associated with establishment of Tarrone Terminal Station (TRTS). This Terminal Station will be built for the connection of Macarthur Wind Farm and Tarrone Power Station and associated facilities to the existing Moorabool-Heywood/Alcoa Portland No.1 500kV Line at Tarrone. The development is to provide a combined maximum output limited to 550MW approximately (due to transformer rating limits). 1.2 Expected System Conditions The following expected system conditions are only included to allow the design of the secondary equipment and for the preparation of secondary settings Expected fault levels The fault levels shown in Table apply to the operation of TRTS once constructed. Table identifies X/R ratios that apply at this Terminal Station. Table 1.2.1: Fault Levels Plant Design Fault Level Max Fault Levels ( Note 1) 3 ph (ka) 3ph (ka) 1ph-g (ka) TRTS No.1 500kV Bus 50 TRTS No.2 500kV Bus 50 Table 1.2.2: X/R Ratios Plant X/R at Ultimate Fault Levels X/R at Max Fault Levels ( Note 1) TRTS No1 500kV Bus 35 TRTS No2 500kV Bus 35 Note 1: Maximum fault Level information will be provided by AEMO upon confirmation of final equipment data from the successful Tenderer Expected protection safe loading limits The protection safe loading limits shown in Table apply to the operation of TRTS once constructed and represent peak loading under worst case conditions considering prior outage and next contingency. Table 1.2.3: Protection Safe Loading Limit Plant Load (ka) Scenario 1 / Scenario 2 TRTS-MLTS No.1 500kV Line TRTS-HYTS/APD No.1 500kV Line 500 kv circuit breakers 500kV busbar The successful Tenderer must consult AEMO if proposed secondary equipment imposes thermal or setting limitations lower than primary plant winter ratings.

2 Page No: 2 of Context of Project Other related PCRs For any consequential works at other terminal stations that may arise out of this project, protection and control requirements will be outlined in the terminal station-specific PCRs identified in Table Table 1.3.2: Consequential Works and other related PCRs PCR PCR Description PCR/HYTS/9 Consequential work at Heywood Terminal Station PCR/APD/5 Consequential work at Alcoa Portland PCR/MLTS/14 Consequential work at Moorabool Terminal Station PCR/TRTS/1 Connection asset requirements associated with establishment of TRTS PCR/TRTS/3 Interface work requirements associated with establishment of TRTS 1.4 General Provision of Information AEMO will advise all parties as applicable, generally 3 months prior to service, the following information: Settings for the synchronism-check interlock facilities; Auto-reclose settings; and Settings for all voltage controls and interlocks General Security Requirements If the successful Tenderer provides any of the following facilities, they must be duplicated and be provided with some measure of physical and electrical segregation as far as practicable: Batteries used for protection and communications purposes; Battery chargers; Auxiliary supplies; Protection panels; Circuit breaker trip coils; Control cables containing X and Y protection quantities, including: Trip circuits to CBs; CT and VT secondaries; Communication systems; and Transformer quantities used for protection purposes. The successful Tenderer must ensure that there is no common point of failure between these duplicated facilities. 1.5 Definitions and Glossary The following terms are used throughout this document: Connection Asset Interface CT HSM PCR QOSM ROI RTU The interface between the shared network development and the connection assets Current Transformer High Speed Monitor Protection and Control Requirements Quality of Supply Monitor Remote Operated Isolator Remote Terminal Unit

3 Page No: 3 of 16 Shared Network Asset Interface SPAR TOC TPAR TPI The interface between the shared network development and the existing SPI PowerNet assets Single phase auto reclose Transmission Operations Centre Three phase auto reclose Tap Position Indication 2. Interface and Shared Network Development The successful Tenderer and SPI PowerNet must exchange protection, monitoring and control signals at the interface between the shared transmission network and the connection assets. The physical location of the interface will be defined in the connection agreement between the successful Tenderer and SPI PowerNet. AEMO has specified within this document the functional obligations on either side of the interface. This interface is shown in Figure 1. The Proponent Generator and the successful Tenderer must exchange protection, monitoring and control signals at an interface between the shared transmission network and the connection assets. The physical location of the interface will be defined in the connection agreement between the successful Tenderer and the Proponent Generator. AEMO has specified within this document the functional obligations on either side of the interface. This interface is shown in Figure 1. Existing (SPI PowerNet s) Transmission Assets Shared Network Development (TRTS owner) Proponent Generator Interface nterface Figure 1: Interface arrangement for TRTS Development. 3. Protection Requirements for Shared Network 3.1 General Requirements For the purposes of this section dead zone is defined as that area in a terminal station between a protection zone and a circuit breaker adjacent to that protection zone that is required to open to clear a fault. Table 3.1: Station Protection Requirements Requirement All clearance times (including backup and dead-zone protection) include the circuit breaker operating times (including those required to operate at remote locations). Equipment provided for each protection system shall, where practical, either be of different manufacturer or have different principle of operation. Protection design must be coordinated to prevent CT saturation interfering with differential protection. Any primary protection system implemented to meet obligations detailed in this document must have sufficient redundancy to ensure that it can meet all obligations within the relevant times with any single element (including any communications facility upon which the protection system depends) out of service.

4 Page No: 4 of Primary Protection Station Protection The successful Tenderer must ensure that any 500 kv faults within the successful Tenderer s assets at TRTS are cleared in the times given in Row 1 of Table measured from fault inception. If the clearance of any fault inside of the successful Tenderer s assets requires the operation of connection assets, the successful Tenderer must ensure that protection trip signalling is provided to the Proponent Generator at the interface within the times listed in Row 2 of Table from the initiation of the fault. Table 3.2.1: Protection - Maximum Protection Times Row Protection System Milliseconds 1 Maximum protection clearance time 80 2 Maximum protection signalling time kV Line Protection If a fault occurs on the TRTS-MLTS No.1 500kV Line, the successful Tenderer must ensure that: - the protection system at TRTS detects the fault and all the successful Tenderer s assets, which are needed to clear the fault, do in fact clear the fault within the time listed in Table from the inception of the fault; and - the successful Tenderer s primary protection system at TRTS interacts with SPI PowerNet s protection system at MLTS to allow SPI PowerNet to achieve the fault clearance within the required time listed in Table from the inception of the fault. Table 3.2.2: Main Protection - Maximum Clearance Times Protection System Milliseconds TRTS MLTS No.1 500kV Line (X and Y) 80 If a fault occurs on the TRTS HYTS section of the TRTS HYTS/APD No kv Line, the successful Tenderer must ensure that: - the protection system at TRTS detects the fault and all the successful Tenderer s assets needed to clear the fault clear the fault within the required time listed in Row 1 of Table from the inception of the fault; and - the protection system at TRTS interacts with SPI PowerNet s protection equipment to achieve the clearance times in Row 2 of Table at HYTS. Table 3.2.3: Main Protection - Maximum Clearance Times Row Station Milliseconds 1 TRTS 80 2 HYTS 80 If SPI PowerNet provides a signal indicating a fault has occurred on the HYTS APD section of the TRTS HYTS/APD No kv Line, the successful Tenderer must trip all assets at TRTS required to clear the fault from the network within the time given in Table after receiving a trip signal from SPI PowerNet at the interface. Table 3.2.4: Main Protection - Maximum Clearance Times Station Milliseconds TRTS 50

5 Page No: 5 of Connection Asset Protection If the Proponent Generator provides a signal indicating a fault has occurred within the connection assets, the successful Tenderer must trip all assets at TRTS required to clear the fault from the network within the time given in Table after receiving the trip signal. Table 3.2.5: Main Protection - Maximum Clearance Times Station Milliseconds TRTS kV Reactor Trip Signals On receipt of remote reactor protection trip signals provided by SPI PowerNet at the interface, the successful Tenderer must ensure that all of the successful Tenderer s assets needed to operate to isolate: - the HYTS/APD No.1 500kV Line; or - the MLTS No.1 500kV Line isolate the required 500kV Line within the time given in Table from the receipt of the signal at the Shared Network Interface. Table 3.2.6: Main Protection - Maximum Operating Times Station Milliseconds TRTS Backup/Dead-zone Protection Maximum Clearance and Signal Times Background to this Requirement AEMO requires that backup/dead-zone protection systems must clear a fault, not otherwise cleared by a primary protection system. SPI PowerNet, the successful Tenderer, and the owners of affected terminal stations must work together in order for these clearance times to be achieved. To achieve this, AEMO requires that the successful Tenderer must meet the following obligations set out in Section Operation of backup protection If a fault is detected by any of the successful Tenderer primary protection systems, the successful Tenderer must ensure that that system also initiates a backup/dead-zone protection system Providing a backup/dead-zone protection trip signal If: - the successful Tenderer s primary protection systems fail to clear a fault, or a fault occurs within a dead zone; or - the successful Tenderer s assets fail to clear a fault if initiated by primary protection of Proponent Generator or SPI PowerNet; and - to clear this fault (while isolating the minimum amount of plant necessary to clear the fault) would require the operation of SPI PowerNet assets, or Alcoa Portland assets; the successful Tenderer must provide a backup/dead-zone protection trip signal to SPI PowerNet at the interface for transmission to remote ends within the times listed in Table from the occurrence of a fault.

6 Page No: 6 of 16 Table 3.3.1: Time for the successful Tenderer to provide a backup/dead-zone Protection Signal at TRTS Shared Network Interface Protection System Milliseconds 500kV Fault (initiated by both X and Y protection) 130 If: - the successful Tenderer s primary protection systems fail to clear a fault, or a fault occurs within a dead zone; and - to clear this fault (while isolating the minimum amount of plant necessary to clear the fault) would require the operation of Proponent Generator s assets; the successful Tenderer must provide a backup/dead-zone protection trip signal to the Proponent Generator at the interface within the times listed in Table from the initiation of a fault. Table 3.3.2: Time for the successful Tenderer to provide a backup/dead-zone Protection Signal at TRTS Connection Asset Interface Protection System Milliseconds 500kV Fault (initiated by both X and Y protection) Clearing fault on receipt of backup/dead-zone protection trip signal The successful Tenderer must ensure that, if a backup/dead-zone protection trip signal is received from SPI PowerNet at the interface, all of the successful Tenderer s assets that are needed to clear the fault do in fact clear the fault within the maximum operating time listed in Table from the receipt of the signal. The successful Tenderer must ensure that, if a backup/dead-zone protection trip signal is received from the Proponent Generator at TRTS at the interface, all of the successful Tenderer s assets that are needed to clear the fault do in fact clear the fault within the maximum operating time listed in Table from the receipt of the signal. Table 3.3.5: Maximum Operating Time Protection System Milliseconds 500kV Fault Monitoring and Controls 4.1 Circuit Breakers and ROIs The successful Tenderer must ensure that all circuit breakers and ROIs referred in this PCR meet the requirements outlined in Tables 4.1.1, and 4.1.3: Table 4.1.1: General Control Requirements General Requirements Equipment must be arranged so that failure of local automatic or remote manual controls cannot prevent operation of the local manual switching controls at the TRTS. Table 4.1.2: Circuit Breaker Common Requirements Requirement Local Trip and Close controls Remote Trip controls for all 500 kv CBs from TOC Remote Close control for all 500 kv CBs from TOC Status indications remotely transmitted for all three 500kV CBs

7 Page No: 7 of 16 Alarms as appropriate for the type of CB Phase discrepancy detection and tripping (if required by CB type) Table 4.1.3: ROI Common Requirements Requirement Local Open and Close controls Interlocked appropriately with circuit breaker and earth switch operation Status indications remotely transmitted for all isolators 4.2 Circuit Breaker Controls The successful Tenderer must ensure that the controls in the following Tables 4.2.1, and are implemented: Table 4.2.1: Circuit Breaker Controls Circuit Breaker: HYTS/APD No.1 Line / No.2 Bus CB (Node DD HH; refer to SLD) Control Requirement Setting Manual synchronising Required Remote Manual Synchronism Check Interlock Required - Voltage differential - Angle differential - Frequency differential - Undervoltage Blocking Remote Manual Synchronism Check Required Interlock bypass Three Pole Auto Reclose - Dead time - Reclaim time Synchronism Check for Auto-Reclose - Voltage differential - Angle differential - Frequency differential - Undervoltage Blocking Live Line Lockout Voltage Interlock Single Pole Auto Reclose - Dead time - Reclaim time Phase discrepancy * *if required by CB type Required (initiated by HYTS/APD No.1 500kV Line protection) Required (initiated by HYTS/APD No.1 500kV Line protection) Not Required Not Required Required (initiated by HYTS/APD No.1 500kV Line protection) CB trip on discrepancy Table 4.2.2: Circuit Breaker Controls Circuit Breaker: MLTS No.1 Line / HYTS/APD No.1 Line CB (Node GG HH; refer to SLD) Control Requirement Setting Manual synchronising Required Remote Manual Synchronism Check Interlock Required - Voltage differential - Angle differential - Frequency differential

8 Page No: 8 of 16 Circuit Breaker: MLTS No.1 Line / HYTS/APD No.1 Line CB (Node GG HH; refer to SLD) Control Requirement Setting - Undervoltage Blocking Remote Manual Synchronism Check Required Interlock bypass Three Pole Auto Reclose - Dead time - Reclaim time Synchronism Check for Auto-Reclose - Voltage differential - Angle differential - Frequency differential - Undervoltage Blocking Live Line Lockout Voltage Interlock Single Pole Auto Reclose - Dead time - Reclaim time Phase discrepancy * *if required by CB type Required (initiated by MLTS No.1 500kV Line or HYTS/APD No.1 500kV Line protection) Required (initiated by MLTS No.1 500kV Line protection or HYTS/APD No.1 500kV Line protection) Not Required Not Required Required (initiated by MLTS No.1 500kV Line or HYTS/APD No.1 500kV Line protection) CB trip on discrepancy Table 4.2.3: Circuit Breaker Controls Circuit Breaker: MLTS No.1 Line / No.1 Bus CB (Node AA GG; refer to SLD) Control Requirement Setting Manual synchronising Required Remote Manual Synchronism Check Interlock Required - Voltage differential - Angle differential - Frequency differential - Undervoltage Blocking Remote Manual Synchronism Check Required Interlock bypass Three Pole Auto Reclose - Dead time - Reclaim time Synchronism Check for Auto-Reclose - Voltage differential - Angle differential - Frequency differential - Undervoltage Blocking Live Line Lockout Voltage Interlock Single Pole Auto Reclose - Dead time - Reclaim time Phase discrepancy * 4.3 SF6 Trip Signals Required (initiated by MLTS No.1 500kV Line protection) Required (initiated by MLTS No.1 500kV Line protection) Not Required Not Required Required (initiated by MLTS No.1 500kV Line protection) CB trip on discrepancy If a SF6 Auto De-energisation trip signal is provided by SPI PowerNet, the successful Tenderer must ensure that all of the TRTS assets that are needed to operate to isolate the HYTS/APD No.1 500kV

9 Page No: 9 of 16 Line isolate the HYTS/APD No 1 500kV Line within the time given in Table from the receipt of the signal at the interface. Table 4.3.1: Maximum Operation Times Station Milliseconds TRTS Alarms The successful Tenderer must provide alarms identified in Table 4.3 for all plant located at the TRTS. Table 4.4: Alarms Requirement Alarms relating to protection or devices relating to protection where such protection would impact on power system security Communications (including RTU, if required) Fire (if applicable) any other control and protection alarms in accordance with good electricity industry practice for the types of plant provided in the station 4.5 Instrumentation Accuracy The successful Tenderer must ensure that the overall errors of measurements are less than: 1.0% of range for current and voltage measurements, and 2.0% for other measurements Ranges The successful Tenderer must provide instrumentation (at the Shared Network Interface) as listed in Table 4.5. Table 4.5: Instrumentation ranges Plant Quantity Required ranges No kv Bus Voltage (3-phase) kv Frequency Hz No kv Bus Voltage (3-phase) kv Frequency Hz MLTS No.1 Line Current (3-phase) 0-3 ka Active power TB FB GW Reactive power TB FB GVAr Voltage (3-phase) kv HYTS/APD No.1 Line Current (3-phase) 0-3 ka Active power TB FB GW Reactive power TB FB GVAr Voltage (3-phase) kv MLTS No.1 Line /No.1 Bus 500kV CB Current (3-phase) 0-3 ka HYTS/APD No.1 Line / No.2 Bus 500kV CB Current (3-phase) 0-3 ka MLTS No.1 Line / HYTS/APD No.1 Line 500kV CB Current (3-phase) 0-3 ka

10 Page No: 10 of Voltage sources The successful Tenderer must ensure that voltage representations of each 500kV Line are established. These voltage representations must be provided from two independently supplied voltage sources through automatic potential selection. These voltage sources, selected from appropriate and suitably switched (via CB or ROI or both auxiliary switches) Line, 500kV Busbar and 500kV Gen Transformer, are required for instrumentation, monitoring and control systems. 4.7 High Speed Monitoring (HSM) Facilities The successful Tenderer must transmit all the inputs in relation to the HSM facility, provided by the Proponent Generator at the interface, to SPI PowerNet at the Shared Network Interface. 4.8 Quality of Supply Monitoring (QOSM) Facilities The successful Tenderer must transmit all the inputs in relation to the QOSM facility, provided by the Proponent Generator at the interface, to SPI PowerNet at the Shared Network Interface. 4.9 Auxiliary Supplies AC Supplies for Shared Network Facilities The successful Tenderer must ensure that three independent and appropriately sized AC supplies are available for the Shared Network assets at TRTS. Acceptable sources include: Transformer tertiary windings. Two feeder supplies from different substations. There should not be loss of supply due to a single event. Diesel generator. Portable generators are acceptable provided the portable units can be connected and operated before expiration of battery capability. The successful Tenderer may negotiate with the Proponent Generator at TRTS or with SPI PowerNet for the provision of AC supplies at the interface or otherwise must establish its own AC supplies. The successful Tenderer must submit the AC Supply design to AEMO for approval DC Supplies for Shared Network facilities The successful Tenderer must ensure that two independent and appropriately sized DC supplies are available for the Shared Network assets at TRTS. The successful Tenderer must ensure that these DC auxiliary supplies meet the requirements in Table and Table The successful Tenderer may negotiate with the Proponent Generator at TRTS for the provision of DC supplies at the interface or otherwise must establish its own DC supplies. Table 4.9.1: DC Supply Requirements Requirement DC supplies must be provided from batteries. The batteries are required to be duplicated. Segregation of X and Y supplies to equipment is required. Table 4.9.2: DC Supply battery load life expectancy Battery life expectancy Main Batteries: 8 hours plus 2 open and 1 close operations for each CB including 2 open and 1 close operation for each ROI Communication Supplies: 10 hours

11 Page No: 11 of Over-voltage protection scheme Under certain abnormal operating conditions, the successful Tenderer s asset may be exposed to voltage conditions in excess of those nominated in S5.1.4 of the NER. The successful Tenderer must ensure that a duplicated over-voltage protection scheme is implemented to reduce the TRTS voltage back to the nominal operating level. The over-voltage scheme must detect an over-voltage at TRTS, while the MLTS-TRTS No.1 500kV Line is open at the MLTS end. This condition may result in an over-voltage condition as depicted in Table Table : Maximum Voltage Conditions Voltage Level Duration 580 TRTS No.1 and No kv Bus 30 minutes The successful Tenderer must ensure that the over-voltage protection scheme will trip the MLTS-TRTS No.1 500kV Line CBs at TRTS, if all of the following conditions are satisfied: - MLTS-TRTS No.1 500kV Line CBs detected open at MLTS; - the TRTS 500kV voltage is detected above a threshold (adjustable in the range of 550 kv to 600 kv with a 2.5 kv resolution); and - the over-voltage is detected for a time (adjustable continuously in the range 1 to 30 seconds). Table summarises the over-voltage protection control scheme. Table : Trip signalling requirements Initiated by over-voltage protection scheme at TRTS Initiate Conditions Output 1 MLTS-TRTS No.1 500kV Line open at MLTS end + over-voltage Trip MLTS-TRTS No.1 500kV Line detected at TRTS for a pre-set time (TRTS end only) The successful Tenderer must ensure that conceptual design of the over-voltage scheme is submitted to AEMO for comments. 5. Remote Monitoring and Control from TOC The successful Tenderer must provide or utilise the quantities identified in Table 5.1 at the Shared Network Interface, where they will be communicated between TRTS and TOC by SPI PowerNet. Table 5.1: Remote Monitoring and Control quantities to be communicated to and from TOC Quantities Controls MLTS No.1 Line / HYTS/APD No.1 Line CB open/close; MLTS No.1 Line / HYTS/APD No.1 Line CB ROIs open/close; MLTS No.1 Line / No.1 Bus CB open/close; MLTS No.1 Line / No.1 Bus CB ROIs open/close; HYTS/APD No.1 Line / No.2 Bus CB open/close; HYTS/APD No.1 Line / No.2 Bus CB ROIs open/close. Status Indications All 500 kv CBs open / closed; All 500 kv ROIs open / closed; SPAR On/Off; TPAR On/Off. Instrumentation As per Table 4.5 The successful Tenderer must ensure that any controls, status indications and instrumentation required to be transmitted between the Proponent Generator and TOC are transmitted to the interface.

12 Page No: 12 of Voltage Unbalance Monitoring AEMO requires the installation of permanent equipment to enable the ongoing monitoring of unbalance on the 500 kv transmission corridor between Victoria and South Australia. This section outlines the requirements for installation of unbalance monitoring facilities, consisting of unbalance measuring devices ( Monitors ), auxiliary supplies, voltage sources and current sources, and for provision of measured data to AEMO. 6.1 Services to be provided The successful Tenderer must provide facilities to enable the measurement of unbalance on each 500kV Line section, and must ensure that: 1. the facilities are designed, installed, calibrated and commissioned to monitor positive and negative sequence current and voltage, and voltage and current unbalance 2. Monitors comply with the requirements outlined in Table the facilities are calibrated such that the overall errors of measurement of the facilities are no greater than those specified in Table measured data is provided to AEMO as specified in Table Monitoring requirements The successful Tenderer must ensure that monitoring provided as part of this project complies with the requirements outlined in Table 6.2. Table 6.2: Monitoring requirements Requirement Measures and stores each rms average phase to phase voltage (magnitude and angle) at a minimum sampling rate of 150 Hz Measures and stores each rms average phase current (magnitude and angle) at a minimum sampling rate of 150 Hz Calculates and stores the following instantaneous quantities at a minimum sampling rate of 150 Hz: Voltage unbalance Negative sequence voltage (magnitude and angle) Positive sequence voltage (magnitude and angle) Zero sequence voltage (magnitude and angle) Current unbalance Negative sequence current (magnitude and angle) Positive sequence current (magnitude and angle) Measures or calculates, and stores, voltage magnitude and angle quantities with a resolution sufficient to satisfy the accuracy requirements of Table 6.3 Measures or calculates, and stores, current magnitude and angle quantities with a resolution sufficient to satisfy the accuracy requirements of Table 6.3 Measures or calculates, and stores, angles relative to: R-W phase for voltage measurements R-N phase for sequence voltage calculations R-phase for current measurements or sequence current calculations Time stamps each measurement with a maximum error of ±1 milliseconds Is capable of storing up to five (5) weeks of data 6.3 Accuracy of measurements The successful Tenderer must ensure that the overall errors of measurement of the facilities are not greater than those specified in Table 6.3.

13 Page No: 13 of 16 Table 6.3: Calibration of Facilities (required accuracy of measurement) Quantity Required accuracy Over the range Phase to phase voltage - magnitude ±0.05% of nominal kv (L-L) Phase to phase voltage angle ± kv (L-L) Sequence voltage magnitude ±0.05% of nominal 450/sqrt(3) kv to 550/sqrt(3) kv (L-N) Sequence voltage angle ± /sqrt(3) kv to 550/sqrt(3) kv (L-N) Phase current - magnitude ±0.05% of full scale A Phase current angle ± A Sequence current - magnitude ±0.1% of full scale A Sequence current - angle ± A 6.4 Provision of data to AEMO AEMO requires data at regular intervals to allow assessment of unbalance before and after establishment of new generation Regular provision of data to AEMO The successful Tenderer must provide data to AEMO: a) as identified in Table 6.4.1; b) in a readily usable format such as Excel, or otherwise in a proprietary format, with the proprietary software included in the project delivery; c) at intervals of no longer than five (5) Business Days 1 ; d) via a process that does not require manual intervention; e) via a method of delivery such as or SPI PowerNet communications facilities (B2B process). Table 6.4.1: Data to be provided to AEMO Quantity Phase to phase voltage - magnitude Phase to phase voltage angle (relative to R-W phase to phase voltage) Positive sequence voltage - magnitude Positive sequence voltage angle (relative to R-W phase to phase voltage) Negative sequence voltage - magnitude Negative sequence voltage angle (relative to R-W phase to phase voltage) Phase current - magnitude Phase current angle (relative to R-phase current) Positive sequence current - magnitude Positive sequence current angle (relative to R phase current) Negative sequence current - magnitude Negative sequence current angle (relative to R phase current) Type Measured Measured Calculated Calculated Calculated Calculated Measured Measured Calculated Calculated Calculated Calculated The successful Tenderer must outline its strategy for data delivery in Table Table 6.4.2: Provision of measured data to AEMO Alternatives Period of use 1 As that term will be defined in the proposed Network Services Agreement

14 Page No: 14 of Availability considerations The successful Tenderer must ensure that continuous data records representing measured unbalance on the TRTS MLPS No 1 500kV Line and the TRTS HYTS/APD No 1 500kV Line are available for at least 90% of each month.

15 No kv Bus No kv Bus TRANSMISSION SERVICES Page No: 15 of 16 Attachment 1: A.1.1 Single Line Diagram TRTS connection MCWF EE II BB HYTS/APD No.1 LINE KK JJ MLTS No.1 LINE DD HH GG AA Shared Network Assets SPI works: Existing Shared Transmission Network Assets: Shared Network Assets Successful Tenderer: Connection Assets: Tarrone Terminal Station Proposed 500kV Single Line Diagram

16 Page No: 16 of 16 A.1.2 Single Line Diagram TRTS Connection Assets