Breaker Shunt
Oct 11
2009
2009
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Breaker Shunt
Can anybody explain me Why two shunt trip coils are used in HV/MV circuit breakers? Is it used as a backup?
Overload, Short circuit and earthfault trip signals can be given to a single trip coil..why do we need two trip coils? I dont think the second trip coil is for backup..there is some specific reason..If anybody knows please explain me..
In the applications I have seen (as a power engineer for 40+ years) the rationale for multiple trip coils in HV/MV breakers was always reliabillity. HV/MV breakers relay on stored energy (in a station battery) for tripping power. There is a subset of protection technology that is concerned about "breaker failure", and the way to address that problem is with redundant relays, redundant station batteries, and redundant trip coils.
Electrician, Commercial Grill Fan, (919) 621-2666, Triangle area
