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Answer Posted / 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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