santhosh


{ City } vizag
< Country > india
* Profession * j.e
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Questions / { santhosh }
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Can we parallel lise the secondary side of the two similiar transformers with same voltage ration, imp, but with different vector groups.. ( for ex. 11 KV / 6.6KV two trfs but different vector groups can we parallelise both of them ,, what happens if we parallelise them

1 Electrical Engineering 2956




Answers / { santhosh }

Question { 63414 }

what is the function of LBB relay


Answer

LBB as ssaid above it means LOCAL BREAKER BACK UP RELAY is a
back up protection for local breaker (CIRCUIT BREAKER) a
predefined time set in the relay and when the circut breaker
for LBB is kept does not operate ( during fault conditions)
in the pre defined time the surrounding breakers are given
trip command by the LBB relay to restriced the fault..

Is This Answer Correct ?    78 Yes 13 No