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7.2.3 DRAWBACKS The option has the following drawbacks: 0BInvestment Evaluation Summary TNM-GS-809-0720 � high capital cost as the total number of assets replaced is higher than alternative, rationalised arrangements; � it does not address the operational issues associated with the ring bus arrangement identified in Section 4; � presents increased risks during implementation working within a constrained, energised site; � obtaining the required outages to undertake the works will be difficult (in order to allow key equipment to be decommissioned, civil works including concrete curing, and finally erection and commissioning of the new equipment); � long outages will reduce reliability of supply to customers supplied from Creek Road Substation; � additional temporary works required during implementation to maintain secure and reliable supply at Creek Road Substation and remote sites; and � may have implications on future development at the site. 7.2.4 CONCLUSION This is not the preferred option because it does not address the reliability and performance issues associated with the 110 kV ring bus arrangement at Creek Road Substation. In addition, implementation would be difficult in terms of obtaining the necessary outages to undertake the works. 7.3 OPTION 3 - STAGED REPLACEMENT OF SELECTED ASSETS IN-SITU 7.3.1 SCOPE The scope for this option is essentially the same as option 2, but implemented using a staged approach based on transmission circuit criticality. This option includes: � initial replacement of assets that have an assigned transmission circuit criticality rating of four or five (13 bays); � initial replacement of other remaining assets that are known to present a safety risk, including voltage transformers, current transformers and post insulators in 2014; � replacement of the underground 110 kV power cable that is in poor condition in 2014; and � deferred replacement of the remaining 110 kV assets by up to three years (three bays). The capital cost of this option includes an initial $23.20 million ($June 2007) to replace critical assets and to address safety issues followed by a deferred capital cost of $4.22 million ($June 2007) to replace remaining 110 kV assets three years later. 7.3.2 BENEFITS The benefits for this option are that it: � allows Transend to achieve the capital expenditure objectives in the mid-term; � addresses the safety issues associated with the 110 kV assets identified in Section 4 of this document; � defers capital expenditure associated with lower criticality assets for up to three years; � addresses the performance issues identified in Section 4 of this document, with the exception of those transmission circuits that have a criticality less than four; and � reduces the ongoing maintenance requirements and costs associated with the site. © Transend Networks Pty Ltd 12 of 17
7.3.3 DRAWBACKS 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; � it does not address the operational issues associated with the ring bus arrangement identified in Section 4; � reduced efficiencies in project delivery; � will need additional transmission circuit outages to undertake the works; and � may have implications on future development at the site 7.3.4 CONCLUSION This option is technically viable. 7.4 OPTION 4 - REDEVELOP USING AIR INSULATED SWITCHGEAR 7.4.1 SCOPE This option includes the replacement, rationalisation and reconfiguration of 110 kV assets at Creek Road Substation using air-insulated switchgear (AIS). This option includes redeveloping the site using a double bus arrangement as presented in Figure 2. © Transend Networks Pty Ltd 13 of 17
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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
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
Page 24 and 25: Renewal Capital Expenditure TNM-GR-
Page 32 and 33: CONTENTS 0BInvestment Evaluation Su
Page 34 and 35: 0BInvestment Evaluation Summary TNM
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 52 and 53: 7.3 OPTION 3 - STAGED REPLACEMENT O
Page 62 and 63: 4.8 BUS CONDUCTOR AND FITTINGS 0BIn
Page 64 and 65: 6 BENEFITS The direct benefits of r
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
Page 85: 0BInvestment Evaluation Summary TNM
Page 90 and 91: � replacement of the 110 kV Meado
Page 96 and 97: � reduced burden on spare parts m
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 113 and 114: INVESTMENT EVALUATION SUMMARY 0BInv
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0BInvestment Evaluation Summary TNM
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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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CONTENTS 0BInvestment Evaluation Su
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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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INVESTMENT EVALUATION SUMMARY TITLE
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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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