Answer / vikramsenareddy

while selecting the MCB u have to check:
1) Current Rating.
2) Response Time.
3) Manufacturer.
4) Type of MCB (mens single pole,double pole, three pole,
four pole). depends on application.
5) Cost.

Answer / dnyaneshwar

in addition to the above point below factors also taken
into account.
1. short circuit breaking capacity.

Answer / roushan.eee

in addition to the above point below factors also taken
into account.
time delay.
short circuit breaking capacity.
frequency
temperature response.

there is a power transformer 66/11kV in delta-delta connection has 5 feeder coming out from the secondary side. One of the feeder in it normally loaded (loaded than other feeder)and this feeder usually trips with double OCR causing the bank transformer to trip. Now if the load of this feeder is put on other transformer then that no problems occurs on that transformer or the load. However normally all the test(IR, PI, short ckt, open ckt,grounding test and other ) has been conducted for this but evertything transformer..... I am not geting what is the actual problem...

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