摘要
基于中性点经消弧线圈接地方式的小电流接地系统单相接地故障选线的研究现状,应用小波变换中信号奇异性检测原理对故障后暂态零序电流进行分析,提出通过对暂态零序电流求模极大值,用最大模极大值比值与其所设阈值比较的选线方法,通过Matlab/Simulink仿真分析,验证了该方法在纯架空、纯电缆、架空和电缆混搭三种线路类型中的任一条线路及两条线路同时发生单相接地故障时选线的可行性,同时给出该方法失效情况的说明。
Based on the situation of fault line selection for single-phase-to-ground on Neutral Point Grounding through Petersen Coil of small current grounding system, apply signal singularity detection principle of wavelet transform to analyze transient zero sequence current after fault, and propose line selection method by transient zero sequence current for modulus maxima, meanwhile, compare maximal modulus maximum ratio with threshold value. And through Matlab/Simulink simulation analysis, this method is proved to be feasible in any one line and two lines of three types of pure overhead, pure cable, overhead-cable mashup lines when single-phase-to-ground fault happened, meanwhile, give the illustration of failure.
出处
《内蒙古电力技术》
2012年第4期9-13,共5页
Inner Mongolia Electric Power
关键词
10kV配电网
中性点
消弧线圈
故障选线
模极大值
10 kV power network
neutral point
petersen coil
fault line selection
modulus maxima
