发电机出口电压互感器匝间短路分析及在线监测装置设计

Analysis of generator terminal potential transformer inter-turn short circuit and design of on-line monitoring device

针对发电机出口电压互感器匝间短路故障频发并极易造成机组非停的问题,本文首先对电压互感器匝间短路进行建模,并分析了电压互感器匝间短路时的电气量特征,然后根据电气量特征设计了一种发电机出口电压互感器匝间短路在线监测装置。该装置可在出口电压互感器发生匝间短路时实现故障的早期诊断和快速预警,以便运行人员及时采取应对措施,防止非停事件发生。

Aiming at the problem that the generator terminal potential transformer(PT)inter-turn short-circuit fault occurs frequently and it is easy to cause shutdown of the units,firstly,the PT inter-turn short circuit is modeled,and the electrical characteristics of the PT inter-turn short circuit are analyzed,and then according to the electrical characteristics,a generator PT inter-turn short circuit online monitoring device is provided.The device can realize early diagnosis and rapid warning of faults when the terminal PT is short-circuited,so that the operating personnel can take timely measures to prevent unplanned outage.