基于暂态介损角的配电网单相接地故障选线方法  

Transient dielectric loss angle-based distribution network single phase-to-ground fault line selection method

作　　者：郑伟彦 钮伟樑 吴靖 李哲 刘兴业 余天吟 ZHENG Weiyan;NIU Weiliang;WU Jing;LI Zhe;LIU Xingye;YU Tianyin(Zhejiang Dayou Industrial Co.,Ltd.,Hangzhou Science and Technology Development Branch,Hangzhou 310051,China;Hangzhou Power Supply Company Binjiang Branch,State Grid Zhejiang Electric Power Company,Hangzhou 310051,China;Hangzhou Power Supply Company,State Grid Zhejiang Electric Power Company,Hangzhou 310000,China)

机构地区：[1]浙江大有实业有限公司杭州科技发展分公司,浙江杭州310051 [2]国网浙江省电力有限公司杭州供电公司滨江分公司,浙江杭州310051 [3]国网浙江省电力有限公司杭州供电公司,浙江杭州310000

出　　处：《天津理工大学学报》2022年第3期8-13,共6页Journal of Tianjin University of Technology

基　　金：国网浙江省电力公司双创项目(C511JZ200005)。

摘　　要：分析了配电网的中性点接地方式对各配电线路介损角的影响,在此基础上,提出一种基于暂态介损角的配电网单相接地故障选线方法。利用小波包对单相接地故障后的零序电压和电流进行小波包分解和能量最大频段的单支重构。基于暂态重构信号计算各配电线路的暂态介损角,依据故障线路和非故障线路暂态介损角的差异选出故障线路。通过MATLAB/SIMULINK仿真验证了该方法的可行性,结果表明其适用于各种中性点接地方式的配电网。This paper analyzes the influence of the neutral grounding mode of distribution network on the dielectric loss angle of distribution lines. On this basis,a transient dielectric loss angle-based single phase-to-ground fault line selection method is proposed. This method utilizes the wavelet packet to decompose the post-fault zero-sequence voltage,current and single-branch reconstructs the frequency band with maximum energy,then calculates the transient dielectric loss angle of each distribution line with the transient reconstructed signals. Finally,the result selects the fault line according to the difference between the transient dielectric loss angle of the fault line and that of the non-fault line. The MATLAB/SIMULINK simulation results verify that the proposed method is feasible and applicable to the distribution network with various neutral grounding modes.

关 键 词：配电网 暂态介损角 小波包重构 故障选线 

分 类 号：TM726[电气工程—电力系统及自动化]