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

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Current transformer make / type Modern Products 09931 Number of units Average age (years) Reyrolle 015204 9 52 Renewal Capital Expenditure TNM-GR-809-0929 Issue 1.0, January 2009 Page 18 of 28 © Transend Networks Pty Ltd UNCONTROLLED WHEN PRINTED Comment 6 34 These units will be retained as spares. Tyree 06/123/16 6 30 The condition of these units will be assessed and if deemed serviceable, they will be installed elsewhere in the transmission network. Table 5 – Replacement of voltage transformer makes and types Voltage transformer make / type Number of units Average age (years) Asea EMFA 120 12 47 Comment Balteau UEV110 6 31 These units will be disposed of because of specific design issues. Ducon PD 6 46 Haefely Trench VEOT 123 6 22 The condition of these units will be assessed and if deemed serviceable, they will be installed elsewhere in the transmission network. Trench 123/3 24 9 There units were installed at Creek Road Substation because of the need to replace units that were in extremely poor condition and highly susceptible to explosive failure. The condition of these units will be assessed and if deemed serviceable, they will be installed elsewhere in the transmission network. Reyrolle KP5323 1 57 Ritz OTEF 6 12 The condition of these units will be assessed and if deemed serviceable, they will be installed elsewhere in the transmission network. 1.6.4 Disconnectors and post insulators The vast majority of the disconnector types associated with the 110 kV substation redevelopments are of an obsolete design that comprises many component that are in poor condition, primarily because of extensive mechanical wear over time. Many of them also have multi-piece, porcelain post insulators installed that are susceptible to failure, particularly those installed in harsh service environments. Multi-piece post insulators are susceptible to surface erosion and cracking or breaking of insulator sheds. Over time, deterioration reduces the mechanical and electrical integrity of the insulator, leading to mechanical and electrical failure.
Renewal Capital Expenditure TNM-GR-809-0929 Issue 1.0, January 2009 Transend has experienced many disconnector and post insulator failures, a number of which have had potentially serious safety consequences. Transend has adopted a condition-based approach with regard to the management of the disconnector population. If the disconnectors are expected to continue to perform reliably, and it is envisaged that they will continue to operate within their capacity, Transend’s practice is to refurbish the units as appropriate, irrespective of age. The disconnector types associated with the 110 kV substation redevelopment program are presented in Table 6. The bracketed numbers indicate the disconnectors associated with the transmission bays that will not be replaced as part of the 110 kV substation redevelopments. Table 6 indicates that 69 of the 131 disconnectors (52 per cent) will not be replaced, even though they have exceeded their nominal service lives. This clearly demonstrates that Transend has adopted a condition based approach to the management of its disconnector population and that alternatives to replacement are adopted where practicable. The disconnectors that do not need to be replaced will be refurbished, with the multi-piece post insulators replaced where practicable. As noted in Section 1.6, Transend established a post insulator replacement program in 1999. This program has included a number of targeted post insulator replacements as well as those replaced as part of substation redevelopment projects. Transend has prioritised the program based on past performance, with consideration of the service environment in which the post insulators are located. Transend considers it vitally important that the post insulator replacement program continue as forecast to address the safety and reliability issues presented by these assets. Table 6 – Disconnector makes and types Disconnector make / type Number of units Asea Brown Boveri (1) 1 Average age (years) Acelec HDB5L 5 47 Acelec HDBE 5 58 Essanntee 05552 32 58 Stanger DR1 (15) 1 51 Stanger DR2 3 (42) 1 47 © Transend Networks Pty Ltd Page 19 of 28 UNCONTROLLED WHEN PRINTED Comment 13 The condition of these units will be assessed and if deemed serviceable, they will be installed elsewhere in the transmission network. Stanger HCB (2) 1 40 These units will be retained for spare parts. Stanger TTT 16 55 Switchgear Pty Ltd type DBR4 (9) 1 43 Taplin D751 1 26 This unit will be retained for spare parts. Note 1: The numbers represented in brackets indicate the disconnectors that will be refurbished and not replaced.
Page 1: APPENDIX 5 Transend, Renewal capita
Page 4 and 5: Renewal Capital Expenditure TNM-GR-
Page 14 and 15: Figure 4 - Overview of the Reyrolle
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This option includes: � installin
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INVESTMENT EVALUATION SUMMARY 0BInv
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1 BACKGROUND 0BInvestment Evaluatio
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0BInvestment Evaluation Summary TNM
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CONTENTS 0BInvestment Evaluation Su
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� replacement of the 110 kV Meado
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4.2 VOLTAGE TRANSFORMERS The 110 kV
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The drawbacks for this option are t
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INVESTMENT EVALUATION SUMMARY 0BInv
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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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3.2.2 110 KV BUS BAR PROTECTION SCH
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Table 3 - Summary of NPV cost analy
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� loss of back-up protection func
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INVESTMENT EVALUATION SUMMARY TITLE
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INVESTMENT EVALUATION SUMMARY TITLE
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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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