Renovation of transformer to ensure lifetime extension, for example:
1) Replacement/retrofit of ASEA 154 MVA 150/109 kV and ASEA 154 MVA 277/109 kV DC bushings on SK1 (from 1976) and SK2 (from 1976) + 2 spare (26 all in all);
1b) Replacement/retrofit of ASEA 154 MVA 150/109 kV and ASEA 154 MVA 277/109 kV current transformers on DC bushings SK1 (from 1976) and SK2 (from 1976) (24 all in all).
2) Exchange of new CT's and DC bushings (separate and merged in both TJE and KSD);
3) Replacement/retrofit of ASEA 154 MVA 150/109 kV and ASEA 154 MVA 277/109 kV AC bushings on SK1 (from 1976) and SK2 (from 1976) (24 all in all);
4) Replacement/retrofit of ASEA 154 MVA 150/109 kV and ASEA 154 MVA 277/109 kV neutral bushings on SK1 (from 1976) and SK2 (from 1976) (8 all in all);
5) Exchange of new AC and neutral bushings (separate and merged in both TJE and KSD);
6) Exchange of flanges, gaskets and seals for DC, AC and neutral bushings and conservator (separate and merged in both TJE and KSD);
7) Exchange of accessories - new valves, new gas-relay, new thermometers, new pressure relays on transformers and tap changers and new maintenance free Silica-gel filters (separate and merged in both TJE and KSD);
8) Complete routine tests, FRA and DGA on new installed components (separate and merged in both TJE and KSD).