what is Over current, earth fault (O/C+E/F) ?

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what is Over current, earth fault (O/C+E/F) ?..

over current meance nothing but a current reaches above the
rated CT Ratio. and over load and fault occur in between 2
lines line to line short circuit it is over currein fault.

Earth fault means fault occur between line to ground is
called Earth fault. used in power system

Is This Answer Correct ?

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what is Over current, earth fault (O/C+E/F) ?..

Answer / k.prakashchandra

It is 2 OCR + EFR scheme for line protection.Usually OCR is
provided for R & B phases and EFR is connected between the
star point of CTs and star point formed by OCRs (R & B
phases) and direct lead from the third CT (Y phase). R &B
phase ct currents through the OCRs, and Y phase ct current
directly form the second star point.

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