摘要
由于双端行波法的波速不确定性和时钟不同步性,会对输电线路的故障测距造成很大的影响,因此为提高输电线路的故障定位精度,采用了一种改进的双端行波法,即通过测量首波头及近端反射波到达线路两端的时间,利用相对时间差值消除波速,确定故障距离。基于ATP-EMTP仿真软件搭建双端输电线路模型,利用小波变换分析故障行波电流。仿真结果表明,改进双端行波法不受过渡电阻、故障位置的影响,且能实现高精度的故障定位。
Due to the uncertainty of the wave speed and clock asynchronous of the double-terminal traveling wave method,it will have a great impact on the fault distance of the transmission line.In order to improve the fault location accuracy of the transmission line,an improved double-terminal traveling wave method is adopted.That is,by measuring the time for the first wave head and the near-end reflected wave to reach both ends of the line,the relative time difference is used to eliminate the wave speed and determine the distance to the fault.Based on the ATP-EMTP simulation software,a double-ended transmission line model is built,and wavelet transform is used to analyze the fault traveling wave current.The simulation results show that the proposed improved double-ended traveling wave method is not affected by the transition resistance and fault location,and can achieve high accurate fault location.
作者
王乐
杜凤瑾
WANG Le;DU Fengjin(School of Electric Power,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;State Grid Henan Electric Power Company DC Transportation Inspection Branch,Zhengzhou 450000,China)
出处
《电工技术》
2022年第3期34-37,共4页
Electric Engineering
关键词
波速
双端行波法
故障定位
小波变换
wave speed
two-terminal traveling wave method
fault location
wavelet transform
作者简介
王乐(1998-),在读硕士研究生,从事电力系统输配电故障方面研究工作。
