一起10 kV并联电抗器投切引起的主变跳闸事件分析与研究

Analysis and Research on a Main Transformer Trip Event Caused by 10 kV Shunt Reactor Switching

本文以一起10 kV并联电抗器切除造成220 kV主变跳闸事件为例,通过仿真模型计算出断路器重燃产生过电压的过程,分析了主变跳闸的原因是真空短路器开断并联电抗器产生的过电压导致相间短路,避雷器对该类型的过电压又无法形成有效保护,最终造成保护装置动作跳闸。针对这一问题,本文提出了相应的治理措施,为防范类似跳闸故障提供了一定的参考依据。

Taking a 220 kV Main Transformer Trip event caused by 10 kV shunt reactor cut off as an example,the process of overvoltage caused by circuit breaker reburning is calculated by simulation model,and the reason of main transformer tripping is that the overvoltage generated by vacuum circuit breaker breaking shunt reactor leads to phase to phase short circuit,and arrester can not form effective protection for this type of overvoltage,and fi nally the protective device is caused Set action trip.In view of this problem,this paper puts forward the corresponding treatment measures,which provides a certain reference for the prevention of similar trip fault.