混合线路故障行波综合定位方法

Integrated fault location method for mixed lines based on traveling wave

针对混合线路故障行波定位中单端定位反射波识别困难,双端定位高精度时钟同步困难等问题,论文提出了一种适用于混合线路的单双端故障综合定位方法。首先根据双端定位法进行故障初步定位,得到故障距离的粗测值,由该粗测值计算故障反射波分别到达线路两端的2个时刻,选取这2个时刻附近的多个反射波头组成故障点的反射波组合,并对反射波组合进行时间求和,与线路总长所求时间和作差得到误差时间矩阵,其中数值最接近零的矩阵元素所对应反射波即为故障点反射波,最后根据单端定位原理实现故障点的高精度定位。EMTP-ATP仿真结果表明:论文所提故障行波综合定位方法有效可行,具有更高的定位精度,为故障快速处理提供保障。

In order to solve the existing problems of fault location for mixed lines,such as the identification of reflected wave front in single-ended traveling wave based fault location and the time accuracy synchronization in double-ended traveling wave based fault location,an integrated fault location method was proposed in this paper.First,the preliminary fault location was completed according to double-ended principle,and the approximate fault distance was obtained.According to the approximate fault distance,two actual times that the fault reflected wave-fronts arrived at both end of lines were respectively calculated.The reflection wave composition was composed of multiple reflected wave-fronts near the two actual times.And the time summation of reflection wave combination could be calculated.And then,the time error matrix was obtained by the difference between the summation value and the time corresponding to the total length of the line.The value which was closest to zero was identified as the fault reflected wave-front arrival time.Finally,the accuracy fault location could be accomplished based on the single-ended traveling wave location principle.EMTP-ATP simulation results show that the proposed fault location method is with high accuracy and feasibility,which provides convenience for disposing fault rapidly.