Under Voltage Trip

When a dead generator or generator with low voltage is mistakenly included in the bus bar it may lead to a short circuit and cause a blackout.


To avoid such an emergency, an Undervoltage trip mechanism is fitted to all generator breakers and some main feeder circuit breakers that trip the breaker when a severe voltage dip occurs.


An undervoltage relay is used for this purpose which is either of magnetic or electronic type. The under-voltage relays are usually slugged to allow a time delay which prevents spurious tripping during transient voltage dips (typically 15%) caused by large motor starting currents.


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