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4.2 VOLTAGE TRANSFORMERS The 110 kV voltage transformers at Palmerston Substation comprise the following types: � ASEA type EMFA120 (six units); 0BInvestment Evaluation Summary TNM-GS-809-0720 � Ducon type PD-AS-11AB (three capacitor voltage transformer units and one coupling capacitor unit); and � Reyrolle type KP5323 (one unit). ASEA voltage transformers The ASEA type EMFA 120 110 kV voltage transformers in service at Palmerston Substation were manufactured in 1963. Voltage transformers of this type have failed explosively in the past. The explosive failure of a voltage transformer presents a significant safety risk to anyone in the vicinity of the voltage transformer at the time of failure. There is also a significant risk of adjacent assets being damaged or destroyed as a consequence of an explosive voltage transformer failure. The average annual preventive maintenance costs associated with 110 kV voltage transformers at Palmerston Substation are $5,500 per three phase set. The EHV Voltage Transformer Asset Management Plan (TNM-PL-809-0614) recommends that the ASEA type EMFA 120 110 kV transformers at Palmerston Substation be replaced because they are in poor electrical condition, are susceptible to major failure and are an obsolete design. The ASEA EMFA 120 110 kV voltage transformers will be 51 years old when decommissioned. Ducon voltage transformers Ducon 110 kV voltage transformers are approaching the end of their service lives, have inherent design deficiencies and are susceptible to explosive failure. Transend has experienced explosive failures of Ducon 110 kV voltage transformers at Palmerston Substation in 2001 and at Avoca Substation in March 2008. Figure 3 presents an image of a failed Ducon 110 kV voltage transformer and porcelain fragments in the switchyard. © Transend Networks Pty Ltd 6 of 13
Figure 3 - Explosive failure of a Ducon 110 kV voltage transformer at Avoca Substation 0BInvestment Evaluation Summary TNM-GS-809-0720 Ducon voltage transformers that were manufactured prior to 1973 incorporated a unique system where a neoprene rubber gasket was encased within a lead sheath to protect the rubber from the insulating oil. As the units age, the lead sheath becomes susceptible to creeping inward causing lead to fall inside the unit, or the rubber to be exposed to the insulating oil which hardens the rubber and results in deterioration of the oil seal. The average annual preventive maintenance costs associated with 110 kV voltage transformers at Palmerston Substation is $5,500 per three phase set. The EHV Voltage Transformer Asset Management Plan (TNM-PL-809-0614) recommends that Ducon voltage transformers at Palmerston Substation be replaced. The Ducon voltage transformers will be 51 years old when decommissioned. Reyrolle voltage transformers The Reyrolle type KP5323 110 kV voltage transformer at Palmerston Substation was manufactured in 1957 and is the last unit of this type in the transmission network. The EHV Voltage Transformer Asset Management Plan (TNM-PL- 809-0614) recommends that the Reyrolle voltage transformer at Palmerston Substation be replaced. The unit will be 57 years old when it is decommissioned. Line voltage transformers This project includes the installation of voltage transformers on each of the 110 kV transmission lines that connect to Palmerston Substation 110 kV to improve the reliability of electricity supply and to reduce the complexity of the associated transmission line protection schemes. Further details of the line voltage transformer installation program and the units that will be installed at Palmerston Substation 110 kV are provided in the Voltage Transformer Asset Management Plan (TNM-PL-809-00614). © Transend Networks Pty Ltd 7 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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CONTENTS 0BInvestment Evaluation Su
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7.3 OPTION 3 - STAGED REPLACEMENT O
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Page 56 and 57: CONTENTS 0BInvestment Evaluation Su
Page 62 and 63: 4.8 BUS CONDUCTOR AND FITTINGS 0BIn
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
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 106 and 107: 4.3 CURRENT TRANSFORMERS 0BInvestme
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Page 113 and 114: INVESTMENT EVALUATION SUMMARY 0BInv
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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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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