基于小波分析的电缆故障测距

电力电缆日益广泛地应用于输配电系统，为了减少电缆故障停电损失，对电缆故障测距的精度要求越来越高，文中指出了传统的脉冲电流测试法（ICE）电缆故障测距存在误差的原因，提出了电感式脉冲电流测试法（IICE），运用小波分解和重构实现信号滤波，再利用多尺度边缘检测理论实现电缆故障测距算法，EMTP仿真和模拟试验表明：IICE测试法消除了传统的ICE测试法反射脉冲识别带来的误差；基于小波分析的电缆故障测距算法是精确的，其测距误差不大于1个采样距离。

WAVELET ANALYSIS BASED POWER CABLE FAULT LOCATION

With more power cable application in transmission and distribution systems, the higher demand of cable fault location accuracy is necessary for reduction of the power cut loss. The error for cable fault location using the traditional impulse current experimentation (ICE) is analyzed. A new type of so called inductance ICE (IICE) is further presented. Signal filtration can be achieved through the wavelet decomposition and reconfiguration and the cable fault location algorithm can be realized by the multi scale edge test theory. Furthermore, the results of EMTP show that IICE eliminates the error while identifying the reflected impulse by the traditional ICE, the wavelet analysis based algorithm has enough accuracy and the fault location error is less than the distance between two sampling points.