改进的拉路选线法

Improved Method of Fault Circuit Selection by Opening Line

针对小电流接地系统单相接地故障选线困难 ,现场不得不采用拉路法检出故障线路的情况 ,采用监视零序电压和各条出线上零序电流的方法 ,改进了传统的拉路选线方法 ,实现了只需要任意拉开一条出线一次 ,就能够准确判定故障线路。利用 EMTP进行了大量的仿真分析 。

Aimed at fault circuit selection by opening line one by one on single phase grounding fault in small current neutral system, an improved method of fault circuit selection based on monitoring zero sequence voltage and zero sequence current of each outlet is employed. This method can select fault circuit exactly by opening any outlet one time. The result of EMTP simulation shows that the method is effective.