Answer Posted / satya rout (oeg rr)

In a transmission &
disttribution system a high voltage line there are so many protection relays are used
like-distence relay, overcurrent & overvoltage rly, earth fault rly,
diffrential rly . All the relay'S are connet paralley to
master trip relay. if any of the protection rely sence the
fault... it will send a voltage signal ,then energise the master trip rely coil and the
master trip relay will trip the breaker.

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