An Adaptive Load-Based Location Method of Stator Ground Fault for Large Hydro-Generators
Tan Liming1,2, Yin Xianggen1,2, Wang Yikai1,2, Qiao Jian1,2, Xu Wen1,2
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China; 2. Hubei Electric Power Security and High Efficiency Key Laboratory Huazhong University of Science and Technology Wuhan 430074 China
Abstract：Stator ground fault is the most common fault in large hydro-generators, and effective ground fault location methods can shorten the troubleshooting time and improve the reliability of the power supply. Existing location methods ignore the influence of armature reaction on the winding voltage distribution under load condition. Based on the in-depth study of the armature reaction mechanism, it is concluded that the voltage distribution of the stator winding under different load conditions is the same as the electrical potential distribution under no-load condition. On that basis, an adaptive load-based location method of stator ground fault for large hydro-generators is proposed in this paper. The fault evaluation function is constructed according to the amplitude and phase relationship between the neutral voltage and the fault winding voltage when a ground fault occurs under no-load condition. Then the fault winding voltage distribution under the real-time load condition is determined and the fault evaluation function is adjusted according to the actual measured value of terminal voltage. Virtual fault points are set on the fault winding and the fault evaluation function value is calculated for each point, and the point corresponding to its minimal value is defined as the fault location result. A quasi-distributed parameter model of the hydro generator is built in PSCAD/EMTDC for simulation verification. Simulation results show that the proposed method can effectively determine the fault location under different fault scenes and load conditions, which provides a reference for fault maintenance.
谭力铭, 尹项根, 王义凯, 乔健, 徐雯. 自适应工况的大型水轮发电机定子接地故障定位方法[J]. 电工技术学报, 2022, 37(17): 4411-4422.
Tan Liming, Yin Xianggen, Wang Yikai, Qiao Jian, Xu Wen. An Adaptive Load-Based Location Method of Stator Ground Fault for Large Hydro-Generators. Transactions of China Electrotechnical Society, 2022, 37(17): 4411-4422.
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2022, Vol. 37 
