Transend - Appendix 5 Renewal capital expenditure - Australian ...

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CONTENTS 0BInvestment Evaluation Summary TNM-GS-809-0720 CONTENTS............................................................................................................................................................................... 2 1 BACKGROUND.............................................................................................................................................................. 3 2 PROJECT OVERVIEW................................................................................................................................................. 3 3 PROJECT TIMING ........................................................................................................................................................ 3 4 INVESTMENT NEED .................................................................................................................................................... 3 4.1 RELIABILITY AND SECURITY .............................................................................................................................. 3 4.2 ASSET MAINTAINABILITY................................................................................................................................... 4 4.3 RISK EVALUATION ............................................................................................................................................. 5 4.4 CAPITAL/OPERATING EXPENDITURE TRADE-OFFS............................................................................................... 5 4.5 COMPLIANCE ..................................................................................................................................................... 5 5 CUSTOMER CONSULTATION................................................................................................................................... 6 6 BENEFITS ....................................................................................................................................................................... 6 7 OPTIONS ANALYSIS .................................................................................................................................................... 6 7.1 OPTION 1: MAINTAIN EXISTING TRANSMISSION LINE PROTECTION SCHEMES AND DEFER REPLACEMENTS ......... 7 7.2 OPTION 2: REPLACE TRANSMISSION LINE PROTECTION SCHEMES....................................................................... 7 8 OPTION ESTIMATES ................................................................................................................................................... 7 9 PREFERRED OPTION .................................................................................................................................................. 7 © Transend Networks Pty Ltd 2 of 7
1 BACKGROUND 0BInvestment Evaluation Summary TNM-GS-809-0720 The Sheffield–Farrell 220 kV transmission line protection schemes were commissioned in 1983 as part of the original Farrell Substation development. Farrell Substation was established in 1982 to provide a connection point for the Pieman River power development and is a critical node in the Tasmanian transmission network. It connects up to 618 MW of generation to the Tasmanian power system and, in turn, the national electricity grid via Basslink. Under certain generation scenarios, Farrell Substation can transmit up to one third of Tasmania’s generation requirement. Sheffield Substation 220 kV is a critical node in the Tasmanian power system because it provides transmission connections to Hydro Tasmania’s power stations located on the west coast of Tasmania and the Mersey Forth power scheme. It also supplies Aurora Energy’s customers located in the north and north-west regions of Tasmania and has the capacity to transfer an additional 660 MW of power to the rest of the power system. During winter months, the amount of power supplied through Sheffield Substation can exceed 50 per cent of the overall power supplied via the transmission system. The Sheffield–Farrell Nos. 1 and 2 220 kV transmission lines provide the sole 220 kV connection between the west coast of Tasmania and the remainder of the transmission network. These transmission lines are critical to the transmission network and are frequently operated beyond their firm capacity. The protection schemes on each of the Sheffield–Farrell Nos. 1 and 2 220 kV transmission lines comprise of static protection relays that are required to be replaced since they are a reliability and power system security risk. Additionally, their obsolete technology does not provide functionality that can be provided by modern protection schemes. Over the past 10 years Transend has installed modern microprocessor based devices on almost all of the backbone 220 kV transmission lines throughout the state. The Sheffield–Farrell No. 1 and 2 transmission lines are two of only three remaining lines (out of thirty two system wide) still protected by static technology relays. 2 PROJECT OVERVIEW The Sheffield–Farrell 220 kV transmission line protection replacement project comprises the replacement of the: � Sheffield–Farrell 220 kV No. 1 transmission line protection schemes at Sheffield and Farrell Substations; and � Sheffield–Farrell 220 kV No. 2 transmission line protection schemes at Sheffield and Farrell Substations. 3 PROJECT TIMING The Sheffield–Farrell 220 kV Transmission Line Protection Replacement project has been programmed to commence in 2009, with final commissioning in 2011. This project is a key part of the Farrell Substation secondary systems replacement project. 4 INVESTMENT NEED 4.1 RELIABILITY AND SECURITY The protection schemes on each of the Sheffield–Farrell Nos. 1 and 2 220 kV transmission lines at Farrell and Sheffield substations comprise one Reyrolle type THR distance protection relay (Main A scheme) and a Mitsubishi type MPC-SB static phase comparison protection relay (Main B scheme). Transend has 22 Reyrolle type THR distance protection relays in service, of which four have failed over the past four years. The Reyrolle type THR relays suffer internal faults which have resulted in the relay being incorrectly blocked from operating or the relay failing to detect fault conditions. Both these failure modes would result in the relay not being able to clear an electrical fault from the network which is likely to result in the alternate protection scheme being solely responsible for clearing a fault on the power system. Therefore, the transmission line would no longer be protected by duplicate schemes. In addition, it also is possible that internal relay faults may result in one or more of the scenarios described below: � slow clearance of faults causing system stability problems or damage to primary electrical equipment; � loss of capability to provide single pole auto-reclosing; and/or © Transend Networks Pty Ltd 3 of 7
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APPENDIX 5 Transend, Renewal capita
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Renewal Capital Expenditure TNM-GR-
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Figure 4 - Overview of the Reyrolle
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Table 3 - Circuit criticality ratin
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Figure 6 - Capacitive voltage trans
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Current transformer make / type Mod
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1.6.5 Protection and control Renewa
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CONTENTS 0BInvestment Evaluation Su
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0BInvestment Evaluation Summary TNM
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5 CUSTOMER CONSULTATION 0BInvestmen
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� implementation of revised maint
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Table 1 - Summary of economic analy
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7.3 OPTION 3 - STAGED REPLACEMENT O
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4.8 BUS CONDUCTOR AND FITTINGS 0BIn
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6 BENEFITS The direct benefits of r
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7.2.3 DRAWBACKS The option has the
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Figure 2 - Option 3: single line di
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This option includes: � installin
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INVESTMENT EVALUATION SUMMARY 0BInv
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1 BACKGROUND 0BInvestment Evaluatio
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4.1 CIRCUIT BREAKERS 0BInvestment E
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� reduced burden on spare parts m
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Page 90 and 91: � replacement of the 110 kV Meado
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Page 134 and 135: 3.2.2 110 KV BUS BAR PROTECTION SCH
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Page 138 and 139: Table 3 - Summary of NPV cost analy
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Page 157 and 158: Burnie-Waratah 110 kV Transmission
Page 159 and 160: CONTENTS Burnie-Waratah 110 kV Tran
Page 161 and 162: 1 BACKGROUND Burnie-Waratah 110 kV
Page 163 and 164: 2.3 MAINTENANCE Burnie-Waratah 110
Page 165: Burnie-Waratah 110 kV Transmission
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