Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

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

The generator circuit breaker is a critical component in power systems, and its reliability directly affects the stable operation of the entire power system. Through research and practical application of intelligent monitoring systems, the real-time operational status of circuit breakers can be monitored, enabling early detection of potential faults and risks, thereby enhancing the overall reliability of the power system.Traditional circuit breaker maintenance primarily relies on periodic inspec

1.Protects the GeneratorWhen asymmetric short circuits occur at the generator outlet or the unit bears unbalanced loads, the GCB can quickly isolate the fault to prevent generator damage. During unbalanced load operation, or internal/external asymmetric short circuits, twice the power frequency eddy current is induced on the rotor surface, causing additional heating in the rotor. Meanwhile, the alternating electromagnetic torque at twice the power frequency induces double-frequency vibration in