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

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0BInvestment Evaluation Summary TNM-GS-809-0720 reasons must be replaced. Inadequate safety at both sites in terms of safe working clearances, substandard substation earthing, substation fencing are all strong reasons to undertake the project. Dependence on [third parties] for interfaces for secondary equipment infrastructure is complex and unacceptable in the long-term. This project must achieve a simplification and standardisation of these substations which are both remote and critical to the security of supply of Transend’s network.’ In addition, Ascension Consulting agreed with the approach undertaken with regard to the development of the Tungatinah Substation 110 kV redevelopment project and fully supported the project implementation strategy. Transend considers that continuing to operate assets that have been independently identified as presenting significant safety risks and being in poor condition is unacceptable. 2 PROJECT OVERVIEW The planned redevelopment and rationalisation of Tungatinah Substation and Tarraleah Switching Station includes the replacement, rationalisation and reconfiguration of all 110 kV primary equipment (including circuit breakers, disconnectors, current and voltage transformers) and replacement of all protection and control equipment. The redevelopment will address significant safety issues at both sites and improve the reliability of electricity supply by replacing assets that are in poor condition and susceptible to failure. The project also includes the reconfiguration of the existing 110 kV ring bus bar arrangements to address operational issues and improve operational flexibility. Figure 2 presents an image of Tungatinah Substation and Tarraleah Switching Station, which are located on opposite sides of the Nive River, approximately 400 metres apart. Figure 2 – Image of existing Tarraleah Switching Station (left) and Tungatinah Substation (right) Figure 3 presents a summary of the age of the key 110 kV assets (by category) at Tungatinah Substation and Tarraleah Switching Station by asset replacement cost (note that the scope of this project does not include replacement of the power transformers). Figure 3 clearly illustrates that the majority of the assets included in the Tungatinah Substation 110 kV redevelopment project are well beyond their nominal service lives of 45 years for primary assets and 15 years for © Transend Networks Pty Ltd 4 of 15
0BInvestment Evaluation Summary TNM-GS-809-0720 secondary assets as defined by Sinclair Knight Merz in its ‘Assessment of Economic Lives for Transend Regulatory Asset Classes’ report prepared in April 2008 provided as attachment 24 of Transend’s revenue proposal. A large proportion of the primary assets at Tungatinah Substation and Tarraleah Switching Station will be at least 63 years old when decommissioned. Figure 3 – Summary of age and value ($000) of major 110 kV assets installed at Tungatinah Substation and Tarraleah Switching Station 3 INVESTMENT TIMING The project is currently scheduled to commence in 2012 and be completed in 2015. The independent review undertaken by Ascension Consulting recommended that the Tungatinah Substation 110 kV redevelopment project be implemented as soon as practicable. This project has been scheduled to commence as soon as practicable, however it has been deferred primarily because of the need to determine the optimum transmission network configuration. This project has required considerable customer consultation and can only commence once the final stage of the Southern Power System Security program (the Waddamana–Lindisfarne 220 kV transmission line project) is completed. The Tungatinah Substation 110 kV redevelopment project has been coordinated with the Meadowbank Substation 110 kV redevelopment and New Norfolk Substation 110 kV protection replacements projects to enable new, current differential protection schemes to be installed on the connecting transmission lines, thereby improving the security and reliability of the transmission network in southern Tasmania. The revised timing of the project has also been co-ordinated with the Creek Road Substation 110 kV redevelopment project given the likely synergies in project implementation methodologies. The Tungatinah Substation 110 kV redevelopment project is currently the third highest ranking of all proposed projects and the second highest renewal project (ranked closely behind the Creek Road 110 kV redevelopment project) in Transend’s works prioritisation tool, primarily because of the safety issues presented by the assets at Tungatinah Substation and Tarraleah Switching Station and the criticality of these sites. It is possible that some works may need to be implemented prior to the planned commencement of the project because of the deteriorated condition of certain assets and the fact that additional asset condition issues will most likely be identified prior to commencement of the project. 4 INVESTMENT NEED This project is required to achieve the following capital expenditure objectives identified in clause 6A.6.7(a) of the National Electricity Rules (Rules): © Transend Networks Pty Ltd 5 of 15
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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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4.8 BUS CONDUCTOR AND FITTINGS 0BIn
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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
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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 79 and 80: 0BInvestment Evaluation Summary TNM
Page 81 and 82: � reduced burden on spare parts m
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Page 88 and 89: CONTENTS 0BInvestment Evaluation Su
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 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
Page 127: Table 2 - Summary of Transend’s c
Page 134 and 135: 3.2.2 110 KV BUS BAR PROTECTION SCH
Page 136 and 137: 5. CUSTOMER CONSULTATION 0BInvestme
Page 138 and 139: Table 3 - Summary of NPV cost analy
Page 142 and 143: � loss of back-up protection func
Page 147 and 148: INVESTMENT EVALUATION SUMMARY TITLE
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Page 157 and 158: Burnie-Waratah 110 kV Transmission
Page 159 and 160: CONTENTS Burnie-Waratah 110 kV Tran
Page 161 and 162: 1 BACKGROUND Burnie-Waratah 110 kV
Page 163 and 164: 2.3 MAINTENANCE Burnie-Waratah 110
Page 165: Burnie-Waratah 110 kV Transmission
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