大容量发电机出口断路器应用问题的探讨

大容量火电机组发电机是否需要装设出口断路器(GCB)，是近十几年来大型发电厂电气工程设计中争论较多，意见不一的问题。主要原因是其目前主要依靠进口，价格昂贵。在不装设GCB的情况下，发电机组虽然也能照常运行，但发电机组正常起、停或事故时厂用电系统切换较为复杂，主变压器、高压工作厂变以及发电机内部故障时不能快速切除故障点而使事故范围扩大等一系列弊端也显而易见。随着国力的增强、建设资金相对宽松、电力系统实行重大体制改革以及在市场经济体制下电力系统运行机制发生转变等因素的影响，对这个有争论的问题重新提出来进行探讨很有必要。

Discussion on Application Problems for Large Generator Circuit Breaker

The question for large generator circuit breaker (GCB) in power plant project design is the problem with different opinion in recent 10 years. Major reason is that GCB is more expensive imported from abroad, and generator unit can be operated normalty without GCB. But, switching of service power for generator unit in normal start and stop or in faults is more complicated, and the faults in main transformer, auxiliary transformer and inside of generator cannot be cleared quickly without GCB. Along with strengthening of national economy and electric power system reform, it is necessary again to discuss the question for large generator circuit breaker (GCB) in power plant project design.