| 摘 要: 运行中的输电线路发生故障时，会在故障点产生向两侧传播的电流行波和电压行波。电流行波和电压行波又统称为故障行波，故障行波会在阻抗不连续点发生折射和反射，由此可以通过采集并分析故障行波得到线路故障信息。利用相模变换对三相电流行波进行解耦，通过解耦后得到的独立模量之间的关系可以确定故障类型和故障相，再利用小波变换模极大值的方法标定行波波头，通过波头信息可以得到故障点距离。仿真结果显示，该方法能准确地确定故障类型和故障相，对故障点距离的定位也能达到很高的精度。 |
| 关键词: 输电线路；行波；故障诊断；小波变换；MATLAB |
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中图分类号: TP206.3
文献标识码: A
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| Research on Fault Diagnosis Method of Transmission Line based on Traveling Wave Theory |
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LI Lijiang1, LIN Hai2, WANG Jia2, CHEN Huanguo2, HU Xuxiao2
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( 1.Beijing Sihuida Power Technology Co ., Ltd., Beijing 101520, China ;
2.School of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China)
26027960@qq.com; 2049535531@qq.com; Wangjiajia1118@163.com; chen8025@126.com; huxuxiao@zju.edu.cn
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| Abstract: When a fault occurs in a running transmission line, a current traveling wave and a voltage traveling wave that propagate to both sides will be generated at the fault point. The current traveling wave and the voltage traveling wave are also collectively referred to as fault traveling waves, which will refract and reflect at the impedance discontinuity point. Therefore, line fault information can be obtained by collecting and analyzing fault traveling waves. The three-phase current traveling wave is decoupled by phase-mode transformation, and fault type and fault phase can be determined through the relationship between the independent moduli obtained after decoupling. Then the traveling wave head is calibrated by the method of wavelet transform modulus maxima, and the fault point distance can be obtained by the wave head information. The simulation results show that the method can accurately determine the fault type and fault phase, and it can also achieve high accuracy in locating the fault point distance. |
| Keywords: transmission line; traveling wave; fault diagnosis; wavelet transform; MATLAB (Matrix Laboratory) |
