1.Introduction1.1 Basic Function and Background of GCBThe Generator Circuit Breaker (GCB), as the critical node connecting the generator to the step-up transformer, is responsible for interrupting current under both normal and fault conditions. Unlike conventional substation circuit breakers, the GCB directly withstands the massive short-circuit current from the generator, with rated short-circuit breaking currents reaching hundreds of kiloamperes. In large generating units, the reliable operati
11/27/2025
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Action time characteristicsFixed-time overcurrent protection: the action time of the protective device is fixed, independent of the size of the fault current. No matter how much the fault current exceeds the setting value, as long as the action conditions are met, a pre-set fixed time will elapse before action is taken to trip or signal is issued. For example, if the set action time is 5 seconds, then when the current exceeds the set value, no matter how much it exceeds, the protection will be t
04/26/2025
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