大型发电机出口断路器事故分析和处理

Analysis and Treatment on Circuit Breaker Fault at Generator Outlet

印度卡玛朗加电厂1号机组(350MW)在启动调试阶段进行同期并网时,发电机出口发生两相短路事故。基于保护装置的故障录波图、微机事件报文和发生事故时的信息,分析事故原因;将更换断路器后进行的主变压器检测试验、发电机断路器特性试验、发电机短路和空载特性试验、机组带负荷试验(更换发电机断路器后进行)的结果,与事故前检测试验数据比较,确认事故后主变压器、发电机的安全性、可靠性没有改变,可以投入运行;针对此次事故暴露的问题提出反事故措施。

During the start-up commissioning of No. 1 unit （350 MW） in India Kamalanga Power Plant, two-phase short-circuit fault occurred at generator outlet during the process of synchronization. The fault causes were analyzed based on fault records, computer messages and other fault information. After the replacement of circuit breaker, the detection test for main transformer, the circuit breaker performance test, short circuit and open circuit performance test for generator, as well as the load test for units were carried out, and the results were compared with the detection test results before fault, in order to confirm that the main transformer and generator could be able to put into operation with the safety and reliability not being changed. Finally, countermeasures were proposed according to the problems exposed in the incident.