Headline story is about lost of 1300MW that was beginning from Generator Transformer Surge Arrest-er was not working and Relay 87GD (GT HV Ground Differential Relay) active to give signal to Lock Out Relay to open 500kV CB and the Unit 650 MW blackout.
Unfortunately the Unit that blackout was supplying the cooling for Compressors for both Unit so another Unit 650MW got trip.
The Picture below is suggestion check-sheet for Surge Arrester.
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