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

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0BInvestment Evaluation Summary TNM-GS-809-0720 7.4 OPTION 4: COMPLETE REDEVELOPMENT OF KNIGHTS ROAD 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 with 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 $8.58 million ($June 2007). 7.4.2 BENEFITS The benefits for this option are that it: � would allow Transend to achieve the capital expenditure objectives; � 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; and � reduces the ongoing maintenance requirements and costs associated with the site. 7.4.3 DRAWBACKS The option has the following drawbacks: � higher capital cost than option 2. 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 2. Table 2 - Comparison of options considered Option Net present value of costs ($M June 2007) 1 Manage existing assets and defer replacement -$5.21 2 Replace selected assets in-situ -$4.71 3 Staged replacement of selected assets in-situ -$4.87 4 Complete redevelopment of Knights Road Substation 110 kV -$5.23 © Transend Networks Pty Ltd 12 of 13
0BInvestment Evaluation Summary TNM-GS-809-0720 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 Knights Road Substation 110 kV. 9 PREFERRED OPTION Option 2 (replace selected assets in-situ) is the least cost option that addresses the identified safety, reliability, condition and design issues at Knights Road Substation. This option also minimise the number and duration of transmission circuit outages due to reduced frequency and duration of maintenance. Further detailed analysis will be undertaken during the project initiation process to ensure that the information and assumptions which have been used to identify the preferred option are still valid. © 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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Page 38 and 39: 5 CUSTOMER CONSULTATION 0BInvestmen
Page 40 and 41: � implementation of revised maint
Page 42 and 43: Table 1 - Summary of economic analy
Page 44 and 45: CONTENTS 0BInvestment Evaluation Su
Page 52 and 53: 7.3 OPTION 3 - STAGED REPLACEMENT O
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Page 64 and 65: 6 BENEFITS The direct benefits of r
Page 66 and 67: 7.2.3 DRAWBACKS The option has the
Page 68 and 69: Figure 2 - Option 3: single line di
Page 70 and 71: This option includes: � installin
Page 73 and 74: INVESTMENT EVALUATION SUMMARY 0BInv
Page 75 and 76: 1 BACKGROUND 0BInvestment Evaluatio
Page 77 and 78: 4.1 CIRCUIT BREAKERS 0BInvestment E
Page 81 and 82: � 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 104 and 105: 4.2 VOLTAGE TRANSFORMERS The 110 kV
Page 106 and 107: 4.3 CURRENT TRANSFORMERS 0BInvestme
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Page 115 and 116: 1 BACKGROUND 0BInvestment Evaluatio
Page 119 and 120: 4.1.2 TUNGATINAH SUBSTATION 0BInves
Page 121 and 122: 4.3.2 TUNGATINAH SUBSTATION The 110
Page 123 and 124: Tarraleah-New Norfolk No. 1 110 kV
Page 125 and 126: � the possibility of a 220 kV con
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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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CONTENTS 0BInvestment Evaluation Su
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� loss of back-up protection func
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0BInvestment Evaluation Summary TNM
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INVESTMENT EVALUATION SUMMARY TITLE
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1 BACKGROUND 0BInvestment Evaluatio
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0BInvestment Evaluation Summary TNM
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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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