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can i know how to design overcurrent setting and earth
fault for 11kv & o.433kv system assuming tx 1000kva.
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Answer Posted / 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..
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