某35kV配电系统单相接地故障分析及解决方案研究

The Analysis and Solution to the Single-phase Grounding Fault of a 35kV Power Distribution System

对单相接地故障的电气特性进行分析,探讨故障造成的危害,对某工厂110 kV变电站35 kV配电系统过电流保护动作跳闸故障进行详细的录波分析,确定跳闸原因为系统发生了单相接地故障,并基于故障零序电流特性提出零序电流保护来识别故障线路,同时提出接地变压器对零序电流呈低阻抗性也是一种良好的解决方案。

This paper analyzed the characteristics of one-phase grounding fault firstly,discussed the damages of the fault,and then,used the record wave to analysis an over-current protection fault of the 110kV substation 35 kV distribution system of a company,confirmed that it is the one-phase grounding fault.At last,it proposed the zero sequence current protection to identify the fault line according to characteristics of the zero sequence current,and pointed out the ground transformer's low zero sequence impedance is also a good solution.