Protection function

▪ Three phase three-stage directional current protection (quick break, time limited quick break, overvoltage, inverse time limit) Equipped with composite voltage locking function.

▪ Three phase primary reclosing (no calibration, synchronous calibration, no voltage calibration) Front acceleration and rear acceleration are optional

▪ PT disconnection lockout voltage protection

▪ Equipped with low current grounding 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 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 support the integrated automation system of substations.

Principle block diagram