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

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Renewal Capital Expenditure TNM-GR-809-0929 Issue 1.0, January 2009 Figure 2 clearly shows that the 110 kV circuit breaker replacement program is a long term program that needs to continue to at least 2020. Figure 2 – 110 kV circuit breaker replacement program overview The age profiles of the circuit breaker population at 2003 and 2009 and projected in 2014 (including anticipated asset additions from augmentation projects) are presented in Figure 3. The figure shows that even though the average circuit breaker age is decreasing, in 2014 there will still be 22 circuit breakers that will have exceeded their nominal service life of 45 years. Although age is not the sole driver for asset replacement, it is our experience that aged circuit breakers that are of obsolete technology are more susceptible to reliability and performance issues. They also require more intensive monitoring and maintenance which has an adverse impact on operating costs. Page 10 of 28 © Transend Networks Pty Ltd UNCONTROLLED WHEN PRINTED
Renewal Capital Expenditure TNM-GR-809-0929 Issue 1.0, January 2009 Figure 3 – 110 kV circuit breaker age profiles at 2003, 2008 and forecast in 2014 Number 90 80 70 60 50 40 30 20 10 0 0-4 5-9 10-14 15-19 20-24 25-29 30-34 35-39 40-44 45-49 50-54 55-59 60-64 Age group (Years) The timing of the Reyrolle 110 kV circuit breaker replacements has been determined taking into account a number of key factors including asset condition, transmission circuit criticality and the performance and condition of assets associated with the circuit breakers. The asset replacements also need to be co-ordinated and prioritised with consideration of the overall works program. Figure 4 presents an overview of the Reyrolle 110 kV circuit breaker replacements and shows that this component of the 110 kV circuit breaker replacement program will extend well into the 2014– 2019 regulatory control period. Nuttall Consulting has made the assumption that Transend is not complying with its own Circuit Breaker Asset Management Plan in that Transend proposes to replace all of its Reyrolle circuit breakers in the forthcoming regulatory control period rather than over a 10 year period. Figure 4 clearly highlights that the replacement program for Reyrolle 110 kV circuit breakers will extend over at least an eight year period out to 2016 (note that the diagram does not show the two circuit breakers that were replaced at Chapel Street Substation in 1999 or the two units replaced at Kermandie Substation in 2005). The overall replacement program for Reyrolle circuit breakers commenced in 1999. This represents a 17 year replacement program for Reyrolle circuit breakers. It is also important to note that the replacement of Reyrolle 110 kV circuit breakers is only one investment driver for the 110 kV substation redevelopment projects. As noted in Transend’s revised revenue proposal 4 , Transend’s replacement strategy is supported by information from other Australian and New Zealand TNSPs, which completed replacement of all Reyrolle OS10 circuit breakers some years ago, responding to similar drivers to those experienced by Transend. 4 Transend’s Revised Revenue Proposal, page 39 © Transend Networks Pty Ltd Page 11 of 28 UNCONTROLLED WHEN PRINTED 2003 2008 2014
Page 1: APPENDIX 5 Transend, Renewal capita
Page 4 and 5: Renewal Capital Expenditure TNM-GR-
Page 14 and 15: Figure 4 - Overview of the Reyrolle
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
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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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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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