基于VMD-TEO的矿用高压动力电缆故障定位方法

Fault location method for mining purpose high voltage power cable based on VMD-TEO

针对矿用高压动力电缆故障测距的小波变换模极大值故障定位方法存在可靠性差、精度低的问题,提出一种基于VMD-TEO的矿用高压动力电缆故障定位方法。利用变分模态分解算法分解故障行波信号,通过Teager能量算子获取分解后的高频模态分量的瞬时能量变化,将TEO瞬时能量谱峰值所对应的时刻代入行波测距算法中,获取故障位置。结果表明,基于小波变换模极大值的故障定位方法的相对误差均大于1%;基于VMD-TEO的电缆故障定位方法的相对误差均小于1%。该方法提高了电缆故障定位的准确度,更有利于电缆故障的排查。

This paper proposes a fault location method for high voltage power cable for mining based on VMD-TEO in an effort to address poor reliability and lower accuracy inherent in Wavelet transform modulus maximum fault location method for fault location of mining high voltage power cable.VMD algorithm works by decomposing the fault traveling wave signal using variational modal decomposition algorithm;achieving the instantaneous energy change of the high frequency modal component after decomposition using the teager energy operator(TEO);and realizing the fault location by substituting the time corresponding to the peak value of TEO instantaneous energy spectrum into the traveling wave ranging algorithm.The results show that,as opposed to the fault location methods based on wavelet transform modulus maxima with the relative errors greater than 1%,the cable fault location methods based on VMD-TEO have the relative errors lower than 1%,aiding in improving the accuracy of cable fault location and thus,cable fault detection.