引用本文:王义凯,尹项根,乔健,谭力铭,徐雯.海洋核动力平台发电机定子绕组单相接地故障风险分析与实时定位[J].电力自动化设备,2022,42(4):
WANG Yikai,YIN Xianggen,QIAO Jian,TAN Liming,XU Wen.Risk analysis and real-time locating of single-phase grounding fault of generator stator winding for offshore nuclear power plant[J].Electric Power Automation Equipment,2022,42(4):
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海洋核动力平台发电机定子绕组单相接地故障风险分析与实时定位
王义凯, 尹项根, 乔健, 谭力铭, 徐雯
华中科技大学 强电磁工程与新技术国家重点实验室,湖北 武汉 430074
摘要:
海洋核动力平台发电机不同运行工况下直连线路对地电容的变化将影响接地故障电流,基于发电机3次谐波电压特征,提出一种无需外加设备的直连线路对地电容实时求解方法。利用故障分量原理在计及基波和3次谐波情况下求解接地故障电流,并依据实时故障风险自适应决定保护出口方式。为缩短故障检修排查时间,构建故障绕组电势与故障相电势满足的几何关系式及其与零序电压满足的幅值相位方程,通过解析计算准确定位故障点与中性点间线圈占完整分支的匝数比,实现接地故障定位。PSCAD/EMTDC仿真分析表明,所提方法具有较高的准确性。
关键词:  海洋核动力平台  发电机定子绕组单相接地故障  故障风险分析  接地故障定位
DOI:10.16081/j.epae.202111024
分类号:TM77
基金项目:国家自然科学基金资助项目(51877089)
Risk analysis and real-time locating of single-phase grounding fault of generator stator winding for offshore nuclear power plant
WANG Yikai, YIN Xianggen, QIAO Jian, TAN Liming, XU Wen
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract:
The grounding fault current is affected by the change of grounding capacitance of the directly connected lines under different generator operating conditions of the offshore nuclear power plant. Based on the characteristics of the third-order harmonic voltage of the generator, a real-time calculating method of grounding capacitance without external equipment is proposed. The grounding fault current is solved considering the fundamental and third-order harmonic waves through the principle of fault component. Thus the protection outlet mode is adaptively determined according to the real-time fault risk. To shorten the maintenance time, the geometric relationship satisfied by the fault windings’ electromotive force and the fault phase electromotive force, and the amplitude-phase equations satisfied by the fault windings’ electromotive force and the zero-sequence voltage are constructed. The turns ratio of the coil between the fault point and the neutral point in the whole branch can be accurately determined by analytical calculation, and the fault locating is realized. Simulation analysis of PSCAD/EMTDC shows that the proposed method has high accuracy.
Key words:  offshore nuclear power plant  generator stator winding single-phase grounding fault  fault risk analysis  grounding fault location

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