影响单相接地故障选线准确性的主要因素研究  

Research on Main Influencing Factors of Accuracy of Single Line⁃to⁃ground Fault Line Selection

作　　者：牛成林 李洋 王亮 薛倩楠 李瑞祥 辛小娟 周立华 NIU Chenglin;LI Yang;WANG Liang;XUE Qiannan;LI Ruixiang;XIN Xiaojuan;ZHOU Lihua(State Grid Tongchuan Power Supply Company,Shaanxi Tongchuan 727031,China;State Grid Xi’an Power Supply Company,Xi’an 710000,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国网铜川供电公司,陕西铜川727031 [2]国网西安供电公司,西安710000 [3]西安交通大学电气工程学院,西安710049

出　　处：《电力电容器与无功补偿》2023年第4期34-40,共7页Power Capacitor & Reactive Power Compensation

基　　金：国网陕西省电力公司2020年本部管理研究开发项目(5226TC1900BJ)。

摘　　要：随着中国配电网的发展,配电网系统容量的增长越来越受到消弧线圈容量的限制,但与此同时选线装置准确率的不够,使得配电网又无法摆脱消弧线圈容量的束缚。因而为提升选线装置的准确率,利用了Matlab/Simulink软件,对中性点不接地和经消弧线圈接地系统发生单相接地故障时的主要稳态特征在工频条件下进行了仿真分析,进而探究了系统不接地和经消弧线圈以及中性点并联选线中电阻对稳态幅值法单相接地故障选线的影响。基于仿真结果表明,在故障过渡电阻阻值位于约1000Ω以下的情况下,在中性点不接地系统中该方法的选线效果最好,但在经消弧线圈接地系统中中性点并联选线中电阻也可以对该方法在经消弧线圈接地系统中的选线效果有较大提升;而在故障过渡电阻阻值位于约1000Ω以上的情况下,不论系统是否经消弧线圈接地和投入中性点选线中值电阻该方法均缺乏良好效果,需要应用其它新方法。With the development of distribution network in China,the growth of capacity of the distribu⁃tion network system is increasingly restricted by the arc suppression capacity.But at the same time,the in⁃sufficient accuracy of fault line selection makes the distribution network not get rid of the shackles of the arc suppression coil capacity.Therefore,for increasing the accuracy of the line selection device,the Mat⁃lab/Simulink software is used to simulate and analyze the main steady⁃state characteristics of a single line⁃to⁃ground fault in a neutral point un⁃grounded system or the grounding system via the arc suppression coil under power frequency conditions,thus,the influence of un⁃grounded system,grounding system via arc suppression coil and resistor of neutral point shunt line selection to the single phase grounding line selec⁃tion of steady amplitude method is studied further.The simulation⁃based results show that,when the fault transition resistance is below 1000Ω,the line selection effect of the method in the neutral point un⁃grounded system is the best,but the resistor in the neutral line selection of the grounding system via arc suppression coil can also increase the line effect of the method in the grounding system via arc suppres⁃sion coil.While,in case of the fault transition resistance above 1000Ω,the method,whether the system grounds via the arc suppression coil and the middle resistance of line selection of neutral point is used,is lack of good effect and other new methods are needed.

关 键 词：消弧线圈 中性点中值电阻 单相接地故障 

分 类 号：TM862[电气工程—高电压与绝缘技术]