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

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The drawbacks for this option are that it: � results in a higher initial capital cost than option 1; 0BInvestment Evaluation Summary TNM-GS-809-0720 � results in a higher overall capital cost than option 2, primarily due to contractor remobilisation and increased internal costs; � does not align with Transend’s policy to utilise dead tank circuit breakers when replacing 110 kV live tank current transformers and circuit breakers for two 110 kV bays; � reduced efficiencies in project delivery, in particular co-ordination of works associated with the Avoca Substation transformer T2 installation project and asset replacement works; and � will need additional transmission circuit outages to undertake the works. 7.3.4 CONCLUSION This option is technically viable. 7.4 OPTION 4: COMPLETE REDEVELOPMENT OF PALMERSTON SUBSTATION 110 KV 7.4.1 SCOPE The scope for this option includes: � in-situ replacement of the existing live tank circuit breakers with dead tank units that have integral current transformers; � replacement of 110 kV disconnectors in situ; � replacement of gantry structures; � replacement of protection and control schemes; and � implement revised maintenance practices. The capital cost of this option is $12.49 million ($June 2007). 7.4.2 BENEFITS The benefits for this option are that it: � allows Transend to achieve the capital expenditure objectives; � addresses safety issues associated with the 110 kV assets identified in Section 4 of this document, in particular the 110 kV voltage transformers and post insulators; � addresses other performance, reliability and design issues identified in Section 4 of this document; � improves operational functionality as new 110 kV disconnectors would be motorised and capable of remote operation; and � reduces the ongoing maintenance requirements and costs associated with the site. 7.4.3 DRAWBACKS The drawbacks for this option are that it: � would need outages of an extended duration for each transmission circuit because it would be required to replace 110 kV disconnectors and other infrastructure; and � would require a higher capital cost than option 2. © Transend Networks Pty Ltd 12 of 13
7.4.4 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 0BInvestment Evaluation Summary TNM-GS-809-0720 Option Net present value of costs ($M June 2007) 1 Manage existing assets and defer replacement -$8.26 2 Replace selected assets in-situ -$8.16 3 Staged replacement of selected assets in-situ -$8.31 4 Complete redevelopment of Palmerston Substation 110 kV -$8.91 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 Palmerston Substation 110 kV. 9 PREFERRED OPTION Option 2 (replacement of selected assets in-situ) is the preferred option because it is the most cost-effective solution to address the identified safety and performance issues presented by the assets at Palmerston Substation 110 kV. 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 13 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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7.3 OPTION 3 - STAGED REPLACEMENT O
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Page 88 and 89: CONTENTS 0BInvestment Evaluation Su
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Page 134 and 135: 3.2.2 110 KV BUS BAR PROTECTION SCH
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Page 157 and 158: Burnie-Waratah 110 kV Transmission
Page 159 and 160: 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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