基于小波变换和TEO的输电线路故障测距方法

Transmission Line Fault Location Method Based on Wavelet Transform and TEO

针对波速对故障测距的影响,利用一种不含波速的行波定位方法研究输电线路的单相接地故障测距问题。先采用小波变换对故障处电压进行变换,提高了故障处电压的时间分辨率,进而采用Teager能量算子(TEO)提取能量特征,判断初始行波到达线路两端的时间,通过故障发生时间和初始行波到达线路两端的时间即可得到故障距离。Matlab/Simulink仿真试验结果表明,该方法具有较高的精确度。

Aiming at the influence of wave velocity on fault location,a single-phase ground fault of transmission line is studied by using a method of traveling wave positioning without wave velocity.Firstly,wavelet transform is used to transform the voltage at fault position so as to improve the time resolution.Furthermore,the energy feature extraction is performed by TEO,and the time which the initial traveling wave reaches the two ends of the line is determined.The fault distance is obtained by the time of fault occurrence and the time of initial traveling wave reaching both ends of the line.Finally,the method is verified by Matlab/Simulink.The experimental results show that the method has high accuracy.