暂态特征模量时频分析的电缆型配电网单相接地故障区段定位  

Single-phase Grounding Fault Section Location of the Distribution Cable Networks Based on the Time-frequency Analysis of the Transient Featured Moduli

作　　者：梁睿[1] 彭楠[1] 张政一 李晶昊 孔令昌 王全金 LIANG Rui;PENG Nan;ZHANG Zhengyi;LI Jinghao;KONG Lingchang;WANG Quanjin(School of Electrical Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu Province,China;School of Mechanical Engineering,Nanjing Institute of Technology,Nanjing 211167,Jiangsu Province,China)

机构地区：[1]中国矿业大学电气工程学院,江苏省徐州市221116 [2]南京工程学院机械工程学院,江苏省南京市211167

出　　处：《中国电机工程学报》2023年第23期9098-9113,共16页Proceedings of the CSEE

基　　金：国家自然科学基金(面上项目)(52077215);江苏省自然科学基金(面上项目)(BK20201348)

摘　　要：配电电缆导体与屏蔽层耦合复杂,电缆发生单相接地故障后,在复杂条件下(如高阻故障、电弧等)故障稳态特征不显著、暂态特征多变,复杂网络中准确定位故障电缆困难。针对典型配电网电缆结构参数特征,首先论证故障暂态信号解耦的可行性,提出相模变换矩阵的一般计算方法;然后,根据电缆发生不同类型单相接地故障前、后暂态模量状态,筛选出能够有效反映单相接地故障的特征模量;最后,考虑配电网拓扑和测量点布置,分析故障后电缆分支节点处的暂态电流特征模量频率分量的幅值分布和极性因子,构建基于空间–测量矩阵的单相接地故障区段定位判据。利用PSCAD/EMTDC搭建10kV电缆型配电网故障仿真模型,典型案例计算结果表明:所提方法能够实现不同条件下单相接地故障区段的定位,与已有方法相比具有优势。The mutual couplings between the conductors and sheath of the distribution cable are complex.After a single-phase grounding fault occurs in the cable,the steady features are not obvious and the transient features are variable in complex conditions(high-impedance faults,arcs,etc.),making fault cable location difficult in a complex distribution network.Aiming at the structural features of the typical distribution cable,the feasibility of decoupling the signals in time domains is firstly verified.The general method for calculating the phase-mode transformation matrices is proposed.Then,according to the states of the moduli before and after the fault,the featured moduli,effectively reflecting the fault,are selected.Finally,considering the topology of the distribution cable network and measurement deployment,the fault section location criterion based on the space-measurement matrix is created by analyzing the amplitude distribution of the frequency component in the moduli and the polarity coefficients of the current moduli at the branch node.A 10kV distribution cable fault simulation model is created by using PSCAD/EMTDC.The calculation results of the typical cases demonstrate that the faults can be accurately located by the proposed method under different conditions,which indicates its advantages over the current methods.

关 键 词：相模变换 特征模量 时频分析 故障定位 配电电缆 

分 类 号：TM862[电气工程—高电压与绝缘技术]