Answer / prakash.

First selected for ct ratio in HT panel.1000kva transformer full load current in primary 52.5amps.so ct ratio in 60amps(60/5).
Now relay setting for over current 55amps.
And earth fault setting 0.5amps in ct secondary amps..

Answer / k.prakashchandra

Normally EFR is set at 20% 0f OCR setting.

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