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

1 BACKGROUND
0BInvestment Evaluation Summary
TNM-GS-809-0720
Knights Road Substation is connected to the transmission network via the Chapel Street–Knights Road–Electrona and
Knights Road–Electrona 110 kV transmission lines. Knights Road Substation supplies Kermandie and Huon River
Substations at 110 kV and Aurora Energy at 11 kV. The combined load at Huon River, Kermandie and Knights Road
substations exceeded 25 MW in winter 2008.
The majority of the 110 kV assets in service at Knights Road Substation were installed when the substation was
commissioned in 1962. A new 110/11 kV connection site was established at Knights Road Substation in 1987.
Figure 1 presents the schematic diagram of the Huon area transmission network that connects to Knights Road
Substation.
Figure 1 – Huon area transmission network schematic diagram
2 PROJECT OVERVIEW
The works at Knights Road Substation include the replacement of selected 110 kV switch bays and protection and
control systems associated with the 110 kV and 11 kV systems. In particular, this project includes the following works:
� replacement of Reyrolle type 110/OS/10 110 kV circuit breakers;
� replacement of Asea type EMFA 120 110 kV voltage transformers;
� installation of 110 kV voltage transformers on each transmission line;
� replacement of girder-mounted disconnectors with pedestal mounted units;
� replacement of multi-piece post insulators;
� replacement of the protection scheme on the Knights Road–Huon River–Kermandie 110 kV transmission line;
� replacement of the 110 kV bus bar protection scheme;
� replacement of the protection scheme associated with the 110 kV bus coupler circuit breaker;
� replacement of the protection schemes associated with transformers T1 and T2;
� replacement of the protection schemes associated with feeder bays and 11 kV bus bars; and
� replacement of the substation supervisory control and data acquisition (SCADA).
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