线缆混合输电线路故障时将出现更加复杂的行波折反射现象，对于故障测距带来不小的难度。为解决此类问题，根据电缆与架空线各自的结构、特性的不同，在输电线路上安装分布式的行波检测装置将线路分成若干区间。应用皮尔逊相关系数的相关性原理，确定故障发生的区间。通过详细的公式推导，抵消掉波速对测距精度的影响，利用第二个SVD(singular value decomposition)分量标定出信号奇异点的脉冲模极大值，推导出分区间不含波速的混合线路故障定位算法。通过PSCAD仿真及MATLAB数据处理结果表明，与常规的单双端测距法应用于线缆组成的混合输电线路相比，可进一步提高测距精度。
英文摘要:
When the cable hybrid transmission line fails, more complex traveling wave refraction and reflection will appear, which brings great difficulty to fault location. In order to solve such problems, according to the different structures and characteristics of cables and overhead lines, the distributed traveling wave detection devices are installed on transmission lines to divide the lines into several sections. The correlation principle of Pearson′s correlation coefficient is applied to determine the interval of fault occurrence. Through detailed formula derivation, the influence of the wave speed on the ranging accuracy is canceled, and the second singular value decomposition (SVD) component is used to demarcate the maximum value of the pulse mode of the singular point of the signal, and the fault location algorithm for hybrid lines without wave speed between sub-divisions is deduced. The results of PSCAD simulation and MATLAB data processing show that compared with the conventional single and double-terminal location method applied to the hybrid transmission line composed of cables, the location accuracy can be further improved.