宜兴发电电动机转子匝间短路故障的电气特征分析

Electrical Characteristics of Field Winding Inter-turn Short Circuit Fault on Yixing Generator-Motor

抽水蓄能电站的发电电动机比一般水轮发电机更容易发生励磁绕组匝间短路故障。考虑到宜兴抽水蓄能电站的安全运行对江苏电网的重要意义,本文计算了宜兴发电电动机不同短路匝数的励磁绕组匝间短路故障中,定、转子绕组的电流分布;并结合理论分析,总结了宜兴电机的电气故障特征并解释了其产生原因,为故障的在线监测及早期发现提供了量化依据。

Compared with the common hydro-generators, the generator-motor used in the pumped storage power station has more occurrence probability of field winding inter-turn short circuit faults. This paper researches on the field winding inter-turn short circuit faults of the generator-motor in the Yixing pumped storage power station, the safe operation of which is of important significance for Jiangsu Power Grid. The fault currents of stator and rotor windings are calculated on Yixing generator-motor, then the harmonic characteristics of the fault current are summarized through the calculation results combined with theoretical analysis, while the production mechanism of the additional harmonics is explained in detail. This paper provides a quantitative basis for on-line monitoring and early detection of the field winding inter-turn short circuit faults in Yixing generator-motor.