Why do this project? The station service transformer 1C-ST1 failed several years ago and 1C-GT1 and 1C-UT1 (originally installed in 1968) were re-purposed at that time to be used for temporary station service until 1C-ST1 could be replaced...
AI summary The station service transformers 1C-GT1 and 1C-UT1, originally installed in 1968, are failing and require replacement to avoid a risk of failure that would leave no backup station service for 1C-ST2. Replacing them with a single 138kV:4.16kV transformer would eliminate the need for two transformers and improve system reliability.