They provide system security and immediate reliable low level ground fault detection on three-phase AC resistancegrounded or grounded electrical distribution systems.
此类继电器能够增加系统安全性，并对三相交流接地电阻或接地配电系统进行可靠的低级接地故障检测。
2
It is suggested that high resistancegrounded method and automation arc blow-out coil parallel resistancegrounded method should be used for power distribution system.