Simultaneous trip of incoming and outgoing breakers of 400kv/220kv trnasformer

Simultaneous trip of incoming and outgoing breakers of
400kv/220kv trnasformer. What are the probable causes?

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Simultaneous trip of incoming and outgoing breakers of 400kv/220kv trnasformer. What are the proba..

Answer / k.prakashchandra

fault detected by any one of differential, over-flux,
OS,bucholtz(2nd stage),thermal (2nd stage), PRV and REF
relays results in tripping on both sides of Tr

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Simultaneous trip of incoming and outgoing breakers of 400kv/220kv trnasformer. What are the proba..

Answer / raj kumar

Incomer side or outgoing side current transformer terminals connected wrongly by mistake.so reverse current will flow in the secondary.secondary is connected to the metering device and protective devices.so protective devices will sense the reverse current flow.if that current reaches certain level,this protective device trip the circuit breaker.
If both side CB's are tripping simultaneously means transformer winding side only fault happened.

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