一种T型输电线路行波故障测距方法

Traveling wave fault location method for T-type transmission line

为进一步提高T型输电线路故障测距的准确性,提出了一种基于小波变换的T型输电线路行波故障测距方法。首先将在各测量点采集到的行波信号进行相模变换;其次将得到的α模分量进行小波变换,得到行波波头首次到达各测量点的时刻;最后判别出故障支路,并计算出故障距离。大量的MATLAB仿真实验结果表明,所提方法不受过渡电阻、故障类型、行波波速等因素的影响,测距误差较小,具有较高的精确性和适用性。

To further improve the accuracy of fault location for T-type transmission lines,a traveling wave fault location method was proposed for T-type transmission lines based on wavelet transform.Firstly,the traveling wave signals collected at each measuring point were transformed into phase-mode signals;secondly,theαmodule component was transformed into wavelet transform to get the time when the traveling wave head reached each measuring point for the first time;finally,the fault branch was identified and the fault distance was calculated.A large number of MATLAB simulation results show that the proposed method is not affected by transition resistance,fault type,traveling wave velocity and other factors.It has small ranging error,high accuracy and applicability.