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

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0BInvestment Evaluation Summary TNM-GS-809-0720 � addresses the asset and safety issues associated with the 110 kV assets identified in section 4, in particular the 110 kV voltage transformers and post insulators; � addresses other performance, reliability and design issues identified in section 4; � addresses the NER compliance issues associated with the Meadowbank–New Norfolk 110 kV transmission line protection scheme; � enables reduced outage duration and ease of implementation (refer to Appendix A for proposed implementation sequence); and � reduces the ongoing maintenance requirements and costs associated with the site. 7.3.3 DRAWBACKS The option has the following drawbacks: � higher capital cost than option 2. 7.3.4 CONCLUSION This option is technically viable. 8 OPTION ESTIMATES A comparison of the net present value of options is provided in Table 1. Table 1 - Comparison of options considered Option Net present value of costs ($M June 2007) 1 Manage existing 110 kV assets and defer replacement -$2.84 2 Replace selected 110 kV assets in-situ -$2.65 3 Replace all 110 kV assets in-situ -$3.37 The economic analysis includes the cost impact to customers in the event of a major circuit breaker failure using a probabilistic approach based on current and forecast load data for each individual transmission circuit connected to Meadowbank Substation 110 kV. 9 PREFERRED OPTION Option 2 (replacement of selected 110 kV assets) is the preferred option because it is the most cost effective solution to address the identified safety, reliability, condition and design issues at Meadowbank Substation. This approach will also minimise the number and duration of transmission circuit outages due to reduced frequency and duration of maintenance. © Transend Networks Pty Ltd 12 of 12
INVESTMENT EVALUATION SUMMARY 0BInvestment Evaluation Summary TNM-GS-809-0720 TITLE PALMERSTON SUBSTATION 110 KV REDEVELOPMENT TRIM REFERENCE D09/3258 DATE JANUARY 2009 REVISION STATUS 2.0 TRANSEND CONTACT DAVID KRUIJVER PROJECT NUMBER ND0953 ATTACHMENT A7 © Transend Networks Pty Ltd 1 of 13
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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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CONTENTS 0BInvestment Evaluation Su
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Page 64 and 65: 6 BENEFITS The direct benefits of r
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1 BACKGROUND 0BInvestment Evaluatio
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INVESTMENT EVALUATION SUMMARY TITLE
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1 BACKGROUND 0BInvestment Evaluatio
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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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