基于小波重构的电力电缆故障测距方法

提出了一种基于小波重构的电力电缆故障测距方法。该方法利用脉冲电源作用下故障相与健全相的电流差作为测量信号，利用小波变换对其作多尺度分解，然后对信号在高频下进行单支重构。与传统的行波测距方法相比，该方法不受电缆分支接头或其他阻抗不匹配点反射被的干扰，不受故障类型的影响，在近区也不存在无法识别反射波的问题，同时也减少了波速不确定性对测距精度的影响。仿真结果表明了该方法的正确性。

A WAVELET RECONSTRUCTION BASED FAULT LOCATION METHOD FOR POWER CABLES

A new cable fault location method based on wavelet reconstruction is proposed. In this method the difference between the currents of faulty phase and sound phase under the high voltage pulse excitation is used as the measured signal and is decomposed in multi-scale by wavelet transform, then reconstructed in single scale. Comparing with traditional fault location method by travelling wave, the presented method will not be interfered by the reflected wave from the branch joint of cables or from other positions where the impedances are not matched and not be influenced by fault types, otherwise, the reflected waves can be recognized even the faulty position is near to the measuring terminal, at the same time, the influence of the wave speed uncertainty can be reduced. The correctness of the proposed method is proved by simulation results.