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

1.Definition and Function1.1 Role of the Generator Circuit BreakerThe Generator Circuit Breaker (GCB) is a controllable disconnect point located between the generator and the step-up transformer, serving as an interface between the generator and the power grid. Its primary functions include isolating generator-side faults and enabling operational control during generator synchronization and grid connection. The operating principle of a GCB is not significantly different from that of a standard c

Units with a capacity of 300MW and above are usually connected in a generator-transformer unit configuration and connected to the power system through the circuit breaker on the high-voltage side of the transformer. During the normal operation of the unit, the circuit breaker may trip automatically due to various reasons. Operators must make correct judgments and take timely measures to ensure the safe operation of the unit.1. Causes of Automatic Circuit Breaker Tripping Tripping due to relay pr

Recently, a Chinese generator circuit breaker manufacturer has successfully developed generator circuit breakers for 1,000MW hydropower and thermal power units, which have passed the group's appraisal and acceptance. Their comprehensive performance has reached the international leading level, filling the domestic gap. This is another major breakthrough following the group's mastery of the technology for large-capacity generator circuit breaker complete sets for 400MW, 600MW, and 800MW units, mar