10kV不接地系统的零序保护方式

针对中性点不接地的10 kV系统,阐述了发生单相接地时的电容电流和零序电压的关系.分析比较了几种判断发生接地故障线路的方法,并指出采用保护测控装置零序电流带方向保护方法较为适用,同时介绍了安装电流互感器接线时的注意事项及调试方法.实践证明,零序电流带方向保护与零序电压报警系统结合使用的保护方式有效、可行.

Zero-sequence protection of 10 kV non-grounding system

Aiming at the lO kV netural non - grounding system, this paper demonstrates the relation between capacitance current and zero -sequence voltage when single -phase grounding occurs, compares several methods judging lines with grounding fault, proposes to adopt zero - sequence current directional protection and introduces matters needing attention when install current transformer wiring and its debugging method. Practice proves the effectiveness and feasibility of the combination of zero - sequence current directional protection and zero - sequence voltage warming system.