Function overview

Protection functions

•  Single and/or three-pole auto-reclosure
•  Synchro-check with live/dead line/bus measurement
•  Closing under asynchronous conditions (consideration of CB operating time)
•  Circuit-breaker failure protection with two stages (single and three-pole with/without current)
•  End-fault protection
•  Pole-discrepancy protection
•  Overvoltage/undervoltage protection

Control function

•  Commands for control of CB and isolators

Monitoring functions

•  Operational measured values
•  Self-supervision of the relay
•  Event buffer and fault protocols
•  Oscillographic fault recording
•  Monitoring of CB auxiliary contacts
•  Switching statistics

Features

•  All functions can be used separately
•  Initiation/start by phase-segregated or 3-pole trip commands
•  Auto-reclosure for max. 8 reclose cycles
•  Evolving/sequential trip recognition
•  Auto-reclosure with ADT, DLC, RDT
•  Synchro-check with ?V, ?φ, ?f measurement
•  Breaker failure protection with highly secure 2-out-of-4 current check detectors
•  Breaker failure protection with short reset time and negligible overshoot time

Communication interfaces

•  Front interface for connecting a PC
•  System interface for connecting to a control system via various protocols

ü  IEC 61850 Ethernet
ü  IEC 60870-5-103 protocol
ü  PROFIBUS DP
ü  DNP 3

•  Rear-side service/modem interface
•  Time synchronization via – IRIG-B or DCF77 or system interface