Protection function:

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

Three phase one-time reclosing (no locking, locking synchronization, no voltage detection), with optional front acceleration and rear acceleration

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 with 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 incoming and feeder protection measurement and control in systems with voltage levels of 66KV and below that are grounded or ungrounded through arc suppression coils. Centralized screen grouping is possible It can also be installed on-site in the switchgear, fully supporting the comprehensive automation system of the substation.

Principle diagram: