大型发电机转子接地故障真机模拟试验分析  

Real-machine Simulation of Grounding Faults of Large-scale Generator Rotor

作　　者：杨新志[1] 李伟[1] 慎志勇[1] YANG Xinzhi;LI Wei;SHEN Zhiyong(China Yangtze Power Co., Ltd., Yichang 443002, China)

机构地区：[1]中国长江电力股份有限公司,湖北宜昌443002

出　　处：《水电与新能源》2020年第5期26-31,共6页Hydropower and New Energy

摘　　要：通过对某电厂2台增容改造前机组进行真机模拟各种短路接地故障实验,使用交流压降法、电压分布法及阻抗法查找各类故障,对定位故障点位置数据分析发现,各种接地故障查找方法真机试验数据与实际存在差异,对比其优劣,为今后该类型机组出现类似故障提供最优试验方法的选择及数据支撑。Real-machine simulation of various short-circuit grounding faults of the generator rotor is carried out in two generator units before the capacity expansion renovation.Then,different fault detection methods,including the AC voltage drop method,the potential distribution method and the impedance estimation method,are tested.It is found that the test results of these methods are of certain differences with the actual situation.The advantages and disadvantages of these methods are compared,which could be used for the choice of the optimal test method.

关 键 词：转子接地 交流压降 电位分布 阻抗估算 

分 类 号：TV734.2[水利工程—水利水电工程]