【摘要】 利用小波包的分频特性和重构算法,分别求取各线路中零序电流各频带能量,选出能量最大的频带为特征频带,对该频带的零序电流和系统零序电压通过模极大值和极性进行比较初步选定出可能故障的线路,然后在此基础上利用检测并联电阻投入瞬间在零序电流上所产生的二次奇异点最大值的方法来确定故障线路。仿真结果表明了该方法的有效性和正确性。更多还原

【Abstract】 This paper calculates respectively energy of every band in zero sequence current of every line with frequency decomposition and signal reconstruction to select the band with the maximal energy as the feature band.At first,it selects all the “likely faulty” lines by comparing the maximal magnitude zero current and the corresponding polarity in all lines and the polarity of the zero sequence voltage’s first half wave,and then,by detecting maximum value of the second break point at the instant of the medium resistance is launched to select the fault line.Simulations indicate that this way is correct and effective.更多还原