小波方法在超高压输电线行波故障测距中的应用

输电线路发生故障后将产生向变电站母线运动的行波，因此可以在母线处采集并记录故障电流行波，利用小波变换快速算法即可实现输电线路的精确故障测距。但由于输电线路故障电流信号中具有很强的突变信息，因此须用小波变换对实变信号进行奇异性检测，从而将奇异信号发生的时刻转换为故障距离。文章通过EMTP仿真计算及对结果的详尽分析，提出了一种利用小波变换模极大值的传播来计算故障距离的新方法。仿真试验表明了该方法具有较高的测距精度。

APPLICATION OF WAVELET METHOD IN TRAVELING WAVE FAULT LOCATION FOR EHV TRANSMISSION LINE

After the occurrence of fault, the traveling wave appears in the transmission line that moves towards the substation buses. The fault current traveling wave can becollected and recorded. Accurate fault location for thetransmission line can be implemented by the data collected and the fast algorithm of wave transformation. Because of thestrong jumping information in the fault current signal, thewavelet transformation can be used for singularity detection in order to implement the fault location. Through the EMTPsimulation and the detailed analysis of the EMTP result, a new fault location scheme for transmission line is proposed by the maximum value of the amplitude. The ultimate simulation test indicates that the traveling wave fault location by wavelettransformation has high accuracy.