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

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Figure 4 – Overview of the Reyrolle 110 kV circuit breaker replacements 1.5 110 KV SUBSTATION REDEVELOPMENTS OVERVIEW Renewal Capital Expenditure TNM-GR-809-0929 Issue 1.0, January 2009 This section provides an overview of the 110 kV substation redevelopment projects that include the replacement of Reyrolle 110 kV circuit breakers. Table 2 presents an overview of the key assets that form the scope of each 110 kV substation redevelopment project. Although each of the projects is titled ‘substation redevelopment’ the extent of redevelopment varies on a case-by-case basis. For example the Burnie, Knights Road, Meadowbank and Palmerston substation redevelopment projects do not include the wholesale replacement of all 110 kV assets. Assets that have already been replaced or are considered to be in a serviceable condition will be retained in service where it is practicable and cost-effective to do so. The Arthurs Lake, Creek Road and Tungatinah substation redevelopment projects are full substation redevelopments because the vast majority of the assets are in a condition where wholesale replacement is required and it has been demonstrated that it is more cost-effective to undertake wholesale replacements rather than piecemeal targeted replacements. There is also a significant opportunity to realise considerable whole-of-life cost benefits (particularly with the Creek Road and Tungatinah substation redevelopment projects) by reconfiguring and rationalising the number of assets at the substations. The scope for each 110 kV substation redevelopment project has been developed taking into account a broad range of factors including the condition of all assets at the substation, future transmission network development needs and the optimal timing in the context of the total capital works program and access to the transmission network to carry out the required works. Further details of the drivers for the asset replacements for each project are provided in the asset management plan relevant to the particular category and the investment evaluation summary for each project. Page 12 of 28 © Transend Networks Pty Ltd UNCONTROLLED WHEN PRINTED
Renewal Capital Expenditure TNM-GR-809-0929 Issue 1.0, January 2009 Table 2 – Key asset replacements that comprise the 110 kV substation redevelopment projects Project description Arthurs Lake Substation redevelopment Burnie Substation 110 kV redevelopment Creek Road Substation 110 kV redevelopment Knights Road Substation 110 kV redevelopment Meadowbank Substation 110 kV redevelopment Palmerston Substation 110 kV redevelopment Tungatinah Substation 110 kV redevelopment Supply transformers (units) Circuit breakers (units) Current transformers (units) Voltage transformers (units) © Transend Networks Pty Ltd Page 13 of 28 UNCONTROLLED WHEN PRINTED Disconnectors (units) Post insulators (units) 110 kV Protection schemes (bays) 1 1 3 - - 6 1 - 8 1 33 - - - 3 - 16 60 21 29 309 6 - 5 15 6 3 94 4 - 3 9 5 - 45 2 - 11 33 11 - 225 4 - 15 2 21 18 30 396 10 Note 1: Three of the 110 kV circuit breakers at Burnie Substation are Sprecher & Schuh units. The need to replace these units has been accepted by the AER. Note 2: Nine of the circuit breakers from Tungatinah Substation 110 kV redevelopment will be re-deployed elsewhere in the transmission network. 1.5.1 Transmission circuit criticality The criticality of each transmission circuit that contains Reyrolle 110 kV circuit breakers and is included in the 110 kV substation redevelopment projects is presented in Table 3. Table 3 shows that the majority of the transmission circuits are critical to the reliability and security of the transmission network. This information has been used as a key input to the prioritisation of the transmission circuits programmed for replacement as part of the 110 kV substation redevelopment projects.
Page 1: APPENDIX 5 Transend, Renewal capita
Page 4 and 5: Renewal Capital Expenditure TNM-GR-
Page 16 and 17: Table 3 - Circuit criticality ratin
Page 18 and 19: Figure 6 - Capacitive voltage trans
Page 20 and 21: Current transformer make / type Mod
Page 22 and 23: 1.6.5 Protection and control Renewa
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Page 34 and 35: 0BInvestment Evaluation Summary TNM
Page 38 and 39: 5 CUSTOMER CONSULTATION 0BInvestmen
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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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0BInvestment Evaluation Summary TNM
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� reduced burden on spare parts m
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CONTENTS 0BInvestment Evaluation Su
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� replacement of the 110 kV Meado
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� reduced burden on spare parts m
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4.2 VOLTAGE TRANSFORMERS The 110 kV
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4.3 CURRENT TRANSFORMERS 0BInvestme
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The drawbacks for this option are t
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INVESTMENT EVALUATION SUMMARY 0BInv
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4.1.2 TUNGATINAH SUBSTATION 0BInves
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4.3.2 TUNGATINAH SUBSTATION The 110
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Tarraleah-New Norfolk No. 1 110 kV
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� the possibility of a 220 kV con
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Table 2 - Summary of Transend’s c
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3.2.2 110 KV BUS BAR PROTECTION SCH
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5. CUSTOMER CONSULTATION 0BInvestme
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Table 3 - Summary of NPV cost analy
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� loss of back-up protection func
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INVESTMENT EVALUATION SUMMARY TITLE
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INVESTMENT EVALUATION SUMMARY TITLE
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Burnie-Waratah 110 kV Transmission
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CONTENTS Burnie-Waratah 110 kV Tran
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1 BACKGROUND Burnie-Waratah 110 kV
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2.3 MAINTENANCE Burnie-Waratah 110
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Burnie-Waratah 110 kV Transmission
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