How to determine earth fault level to set relay for a normal distribution sys

How to determine earth fault level to set relay for a
normal distribution system of 11 kV , 100 A load????????

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How to determine earth fault level to set relay for a normal distribution system of 11 kV , 100 A..

Answer / k.prakashchandra

EFR is usually set at 20 % of OCR.The earth fault current
is V/ Z of the line + ER value of the support.But you can
not expect this calculated earth fault current.

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