what is the difference between underreach and overreach.what is the advantage

what is the difference between underreach and
overreach.what is the advantage of using overreach instead
of underreach.explain

Question Posted / bps

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what is the difference between underreach and overreach.what is the advantage of using overreach i..

Answer / n k singh

Underreach and overreach is the ability of distance relays
to operate below and above designed impedance.As we know
the impedance relay operates when impedence seen by the
relay is equal to designed impedance.

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