对SEL-351A继电器方向元件的认识

The Understanding of direction elements of SEL-351A relays

通过对SEL-351A的零(负)序方向元件分别在接地方向、相间故障方向及三相短路故障方向的理论分析,结合电测试数据阐述了对SEL-351A继电器方向元件的认识。

Combined with statistics from the electronic test,the cognition towards the direction elements of SEL-351A relays has been theoretically analyzed via their performances in zero（opposite） direction of SEL-351A in directional earth-fault,phase to phase fault and three phase short-circuit respectively.