基于SWT-TEO的矿用电力电缆故障定位方法

Fault Location Method of Mine Power Cable Based on SWT-TEO

当同步挤压小波变换(SWT)寻找模极大值法应用在矿井电力系统线路故障点定位时可能存在伪极值,导致定位可靠性差、精度低。提出了一种基于SWT和Teager能量算子(TEO)相结合的矿用电力电缆故障定位的方法。首先对故障行波信号进行SWT变换,获取SWT处理后的高频分量,然后计算其TEO瞬时能量谱,将TEO瞬时能量谱峰值所对应的时刻代入不受波速影响的双端行波测距算法中,以获取故障点的位置。MATLAB仿真结果验证了该方法的可靠性。

When synchrosqueezing wavelet transform(SWT) is used to find the modulus maximum in mine power system line fault location, there may be pseudo-extremum, which leads to poor reliability and low precision. Proposed a method of fault location for mine power cable based on the combination of SWT and Teager energy operator(TEO). Firstly, the fault traveling wave signal was transformed by SWT and high frequency components were obtained after SWT processing. Then the instantaneous energy spectrum of TEO was calculated, and the time corresponding to the peak of the instantaneous energy spectrum of TEO was substituted into the two-terminal traveling wave fault location algorithm which is not affected by the wave velocity, so as to obtain the fault position. MATLAB simulation results verify the reliability of this method.