What should be value of Circuit breaker operating time and
Answers were Sorted based on User's Feedback
Answer / sunil solanki
circuit breaker operating time & tripping time should be in
ms.also tripping time should be less than operating time.
|Is This Answer Correct ?||5 Yes||0 No|
Answer / barkha thakur
Circuit breaker operating time & tripping time should be
few cycles of the supply voltage
|Is This Answer Correct ?||2 Yes||0 No|
Answer / electrix
Cicuit Breaker Opening / Closing time are always in milli
secs. usually in 11 kv breakers it is around 60 - 80 ms for
closing and 40 - 60 ms for opening.
|Is This Answer Correct ?||1 Yes||1 No|
My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I - is the value of AC fault current. t - is the operating time of disconnecting device in seconds. K – is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.
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