基于波形特征的小电阻接地配电网单相接地故障定位分析

Single-phase-to-ground Fault Location Analysis of Distribution Network with Small Resistance Grounding Based on Waveform Characteristics

随着配网系统电容电流日渐增大,中性点经小电阻接地方式得到推广应用。然而,小电阻接地方式存在高阻接地时零序电流保护无法切除故障线路的问题。本文首先主要对接地故障的检测方法进行分析,然后,基于零序电流波形的时域特征,分析单相高阻接地故障保护原理及流程,具有一定的参考价值。

With the increasing capacitive current in the distribution network system,the grounding method through a small resistance at the neutral point has been widely applied.However,there exists a problem in the small resistance grounding method where the zero-sequence current protection cannot isolate the fault line during high-resistance grounding.This article primarily analyzes the detection methods for grounding faults.Then,based on the time-domain characteristics of the zero-sequence current waveform,the protection principle and process for single-phase high-resistance grounding faults are analyzed,providing a certain reference value.