Protection function

Three phase three-stage current protection (quick break, time limited quick break, overcurrent, reverse time limit)

Overload protection (trip and alarm optional)

Zero sequence overcurrent protection (trip and alarm optional)

scope of application

This device is suitable for incoming and feeder protection measurement and control in systems with arc suppression coil grounding or ungrounded voltage levels of 10KV and below. It can be centrally assembled and installed on-site in the switchgear, fully supporting the comprehensive automation system of the substation.

Schematic diagram of device operation circuit