WHAT IS DIFFERENCE BETWEEN idmt and instentanous relay?
is idmt is used as back up protection or else?or when
instantenous relay saturates IDMT will operate???
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Answer Posted / k.prakashchandra
IDMTL relay has inverse characteristic and the other is
instantaneous for very heavy faults.The former trips by disc
rotation ,and the latter by a lever placed near the
electro-magnet
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