why not phase to phase fault occure in raining day in hv sub-station?
Because rain drops are not continuous. Only in rare cases if rain is full than not only LL but LLL fault can also occur. But in transmission lines the design and slag plays the important role. Also insulators are designed so that water cannot accumulate.
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I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?
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1 Answers Milestone, Reliance Jio,
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