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

1 BACKGROUND
0BInvestment Evaluation Summary
TNM-GS-809-0720
Palmerston Substation 110 kV is critical to ensuring a secure and reliable electricity connection point for customers and
generators in northern Tasmania. Palmerston Substation 110 kV provides:
� an interconnection to Palmerston Substation 220 kV via a 200 MVA auto-transformer;
� two transmission lines to Hadspen Substation;
� an interconnection to Waddamana Substation in southern Tasmania;
� a radial supply to Avoca and St Marys substations;
� a radial supply to Arthurs Lake Substation;
� two 110/22 kV connections to Aurora Energy; and
� two connections to Hydro Tasmania’s Poatina power station.
Figure 1 presents the schematic diagram of the northern Tasmanian transmission network that connects to Palmerston
Substation.
Figure 1 - Northern area transmission network schematic diagram
SHEFFIELD
GEORGE TOWN
The majority of the existing 110 kV assets in service at Palmerston Substation were installed when the 110 kV
switchyard at Palmerston Substation was commissioned in 1963.
2 PROJECT OVERVIEW
PALMERSTON
HADSPEN
ARTHURS LAKE
TREVALLYN MOWBRAY
NORWOOD
AVOCA
SCOTTSDALE
ST. MARYS
The planned redevelopment of Palmerston Substation 110 kV primarily includes the replacement of circuit breakers,
voltage transformers, post insulators, and selected protection and control equipment. The substation redevelopment will
address the identified safety issues and improve the security and reliability of electricity supply by replacing assets that
are in poor condition and susceptible to failure.
This project includes the following major works at Palmerston Substation 110 kV:
� replacement of 11 Reyrolle type 110/OS/10 circuit breakers with dead tank circuit breakers that have integral current
transformers;
� refurbishment of 28 disconnectors including replacement of the multi-piece post insulators;
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