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随着配电网网架的加强,线路增长,分支线路增多,线路变得复杂,用传统的巡线方法找出具体故障点的位置非常困难。开展配电线路故障测距技术的研究具有重大意义。由于配电网有大量分支,利用行波进行配电网故障测距时,接地故障点的反射波混杂在由线路的分支节点和许多端点造成的众多反射信号中。通常的方法很难识别出来自故障点的反射信号。因此,排除噪声干扰并提取有用的行波信号是精确测距的关键。在现有的行波测距原理的基础上,提出了基于数学形态学的配电网行波故障测距方案。在利用数学形态学对采集到的行波数据进行滤波后,利用多分辨形态梯度变换提取行波波头的模极大值,进而确定故障点。通过仿真分析和现场算例分析,验证了该方案的可行性。
With the strengthening of distribution grids, the growth of lines, the increase of branch lines and the complicated lines, it is very difficult to find out the location of the specific fault point by the traditional patrolling method. It is of great significance to carry out research on fault location technology of distribution line. Due to the large number of branches in the distribution network, reflected waves from the ground fault point are mixed in many reflected signals caused by the branch nodes and many endpoints of the line when the traveling wave is used to perform fault location in the distribution network. The usual method is difficult to identify the reflected signal from the point of failure. Therefore, to exclude noise interference and extract useful traveling wave signals is the key to accurate ranging. Based on the existing principle of traveling wave ranging, a traveling wave fault location scheme based on mathematical morphology is proposed. After filtering the acquired traveling wave data by using mathematical morphology, the modulo maximum of the traveling wave header is extracted by multiresolution morphological gradient transform to determine the fault point. Through the simulation analysis and on-site case study, the feasibility of the scheme is verified.