Answer / tushar choudhuri

Rated interrupting time is the mean time for interruption of any current exceeding the rated interrupting current of the Breaker.The possible relaying time of modern high speed protection is 0.5 to 1,0 cycle.The breaker interrupting time of high speed modern circuit breaker is nearly 2 to 3 cycles.

Where voltage are high and current to be interrupted is low the breaker preferred is:

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IN star -delta motors normally first operated in star mode {absulated given (r-y-b) phases after one miute change in delta mode in this case i am change phase sequience for example R -PHASE TO CHANGE Y-PHASE ;Y-PHASE TO CHANGE R-PHASE SO THIS TIME MOTOR WILL HAPPEN RUNNIG MODE EIGHTER(OR) STOP MODE(TRIP MODE)

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