10 kV配电网单相接地故障特征分析及选线方法

Characteristic Analysis and Line Selection Method of Single-phase Grounding Fault in 10 kV Distribution Network

单相接地故障一直是影响配电网安全稳定运行的巨大隐患,如何快速准确地实现故障隔离是相关研究的重点。本文总结了中性点经消弧线圈接地系统和不接地系统发生单相接地故障时的故障特征,并进一步介绍了两种故障选线方法,即零序电流比较法和首半波法,最后通过试验验证了两种方法的准确性。

Single-phase grounding faults have always been a huge threat affecting the safe and stable operation of distri⁃bution networks.How to realize fault isolation quickly and accurately is the focus of related researches.This paper sum⁃marized the fault characteristics of single-phase grounding fault in neutral grounding system and ungrounded system through arc suppression coil,and further introduced two fault line selection methods,namely zero sequence current com⁃parison method and first half wave method.Finally,the accuracy of the two methods was verified by experiments.