基于故障序特性分析的配电网单相接地故障研究

Research on Single-Phase Grounding Fault of Distribution Network Based on Fault-Sequence characteristics Analysis

依据电力系统知识给出零序电压和负序电流启动判据条件,同时分析配电网单相接地故障时的特征。对序特性分析方法进行研究,建立单相接地序特性模型。以电流、电压双判据融合定位故障段区,并以阻抗法对故障段区进行测距,精确定位故障点的位置,探索出一种基于序特性的多判据融合的单相接地故障辨识方法。对单相接地故障进行仿真分析,验证了方法的可行性和正确性,对配电网的安全运行具有指导意义。

Based on the analysis of the starting criterion of zero-sequence voltage and negative-sequence current,this paper analyzes the characteristics of the single-phase grounding fault of the distribution network at the same time,studies the analysis method of the fault-sequence characteristics,and establishes the single-phase grounding sequence characteristic model.The fault segment area is fused by dual criteria of current and voltage,and the fault segment distance is measured by the impedance method to accurately locate the fault point,and a single-phase ground fault identification based on the fusion of multiple criteria of sequence characteristics is explored.The simulation analysis of single-phase grounding faults verifies the feasibility and correctness of the method,and have guiding significance for the safe operation of the distribution network.