基于零序电流方向的漏电保护原理

Leakage Protective Rule of Zero Sequence Current Direction

介绍了用两个零序电流互感器的零序电流方向的漏电保护原理及其特点,可将保护动作范围仅限在分支馈电开关到磁力起动器之间,各级漏电保护之间的纵向选择性无需通过时间差来实现,原理本身就可以实现纵横向选择性。更易判断保护范围内的漏电故障。

The leakage protective Rule and characteristics of two Zero Sequence Current mutual inductor with zero sequence current direction are introduced. The zero sequence current mutual inductor can limit the protective range between branch feed stwitch and magnetic starter, and the longitudinal and lateral choice of every step leakage protective device needn＇t be realized by time difference, but by the rule itself and can easy judge the trouble of leakage current.