自适应工况的大型水轮发电机定子接地故障定位方法

doi:10.19595/j.cnki.1000-6753.tces.211155

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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.

Key words： Large hydro-generator stator ground fault armature reaction fault winding voltage distribution fault evaluation function

Received: 29 July 2021

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TM312

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	Articles by authors
	Tan Liming
	Yin Xianggen
	Wang Yikai
	Qiao Jian
	Xu Wen

Cite this article:

Tan Liming,Yin Xianggen,Wang Yikai等. An Adaptive Load-Based Location Method of Stator Ground Fault for Large Hydro-Generators[J]. Transactions of China Electrotechnical Society, 2022, 37(17): 4411-4422.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.211155 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I17/4411

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