Protection function:

Three phase three-stage directional current protection (quick break, time limited quick break, overcurrent, reverse time limit) with composite voltage lockout function.

PT disconnection lockout voltage protection

Equipped with low current ground collision line selection function

Low voltage protection, voltage loss protection

Low frequency load shedding protection for low-voltage locking and slip locking

Overload protection (trip and alarm optional)

Zero sequence overvoltage protection

Zero sequence overcurrent protection (trip and alarm optional)

Scope of application:

This device is suitable for transformer protection with voltage levels of 66KV and below Suitable for protection and measurement of 10KV (6KV)/0.4KV distribution transformer cotton and 66 KV/h capacity barrier voltage transformer bed. Specially suitable for distribution protection and measurement of power systems, industrial and mining enterprises, and building systems It can be centrally assembled and installed on-site in the switchgear, fully supporting the comprehensive automation system of the substation.

Principle block diagram