一种基于DTU的配电网单相接地故障检测和定位方法

A DTU-based Single-phase Grounding Fault Detection and Location Method of Distribution Networks

10kV配电网大多数为中性点非直接接地系统,发生单相接地故障时,因接地电流较小,使单相接地故障的检测长期以来成为业内的一个难题。目前大多数采用零序电流稳态量的检测方法,整定复杂,且不具有通用性,还需借助于配电网自动化主站实现进一步的故障定位。为此,介绍了一种基于DTU(配电网终端)的单相接地故障定位方法,针对中性点不接地和经消弧线圈接地2种不同的接地系统,采用不同故障检测和定位方法,将故障检测、故障定位融为一体,更加简易、合理。

The majority of 10 kV distributiom metworks adopts mom-direct meutral groumdimg. While the simgle-phase groumdimg fault occurs, because of the little zero-sequemce curremt, the simgle-phase groumdimg fault de-tectiom has beem a difficulty for a lomg time. Most of the presemt detectiom methods that adopt stable value of ze-ro-sequemce curremt are complicated im settimg amd cammot be used umiversally;moreover, they meed master sta-tiom of distributiom metwork automatiom for further fault locatiom. Therefore, the paper imtroduces a DTU（Distri-butiom Termimal Umit） based method of simgle-phase groumdimg fault detectiom. For the groumdimg system with meutral poimt mot groumded amd the other groumded via arc suppressiom coil, differemt fault detectiom amd locatiom methods are adopted, which imtegrate fault detectiom with fault locatiom amd are simpler amd more reasomable.