小电流接地系统接地故障选线方法

Fault Line Selection Method of Small Current Grounding System

小电流接地系统可以保障配电网运转的可靠性,所以我国中低压配电网中大多采用此系统,但是此系统经常发生单相接地故障,并且长时间运行比较容易发展成多相短路,从而造成整个电网电路的短路,不利于系统有效的安全运行,所以应该尽快找出故障线路并将其切除。简要总结近年来现有的选线的理论方法,对选线方法的原理做了简要分析,并指出了小电流接地系统故障选线的主要侧重方向。

The small current grounding system can ensure the reliable operation of distribution network, therefore, it is commonly used in medium and voltage distribution network in China. However, single phase grounding fault occurs frequently in this system, and it will easily result in multi-phase,short circuits after long-time running,then causing the whole circuit to be short-circuited, which is detrimental to the system’s safe operation. Thus, the fault grounding line should be quickly found out and cut off. In this paper, the current principles for fault line selection are summarized and analyzed, and the research direction is pointed out.