330MW火电机组发变组出口断路器跳闸原因分析

Trip cause analysis for outlet circuit breaker trip of generator-transformer unit in 330 MW coal-fired power plant

针对一起330 MW火电机组发变组出口断路器在无任何保护动作情况下的跳闸故障,采用逐步排查法,通过现场模拟实验,找出了故障的原因,提出有效解决办法并制定了防范措施。应用结果表明:改进措施消除了机组存在的安全隐患,确保了机组的长周期安全运行。

Aiming at an accident of generator-transformer unit outlet circuit breaker trip without any protection device act in 330 MW coal-fired power plant, using gradual elimination method and field simulation test, finds out the causes of the trip, puts forward effective solution and preventive measures. The application result shows that the improved measures eliminate the hidden safety trouble, guarantee long periodic safe operation of the 330 MW coal-fired power generation unit.