基于链表法的复杂配电网单相接地故障在线定位

Research on the on-line locating of single-phase-to-earth fault based on chain table algorithm

基于独特的链表分析模式,提出了一种处理复杂配电网单相接地故障在线定位问题的新方法。利用馈线终端单元(FTU)获取单相接地故障信息,然后以树枝为单位根据其首末节点故障信息进行故障一次定位,再沿正方向根据树枝内区域首末节点故障信息不一致完成二次精确定位。针对树枝交叉区域故障和数据缺失及畸变等情况,提出了相应的解决策略。算法原理简单,定位准确,运算速度快,容错性强,满足在线定位的要求。通过算例分析,验证了算法的正确性和可行性。

Based on the chain table model, a new algorithm is proposed to solve the issue of on-line location of single phase grounding fault of complex distribution network. Firstly, the data of fault information is obtained by FTU. Then taking branch for the unit and using the data between the head node and the end node, the fault branch is found in the first location. Finally, according to the information at the two ending nodes of each region, accurate location is realized in the second location along the indicated direction. Some particular cases, such as the failure between the branches, the scarcity of nodes information and the distortion of the data measured by FTU, are analyzed and corresponding methods are discussed. The algorithm shows characteristics of simple principle, accurate location, high speed calculation and better fault-tolerance, making on-line locating of the grounding fault a reality. Through a case analysis, the correctness and feasibility are verified.