Function overview

Protection functions

•  Differential protection for universal use with power lines and cables on all voltage levels with phase-segregated
   measurement (87L)
•  Two line ends capability
•  Suitable for transformers in protected zones (87T)
•  Restricted ground-fault protection (87N) if a transformer is within the protection zone
•  Well-suited for serial compensated lines
•  Two independent differential stages: one stage for sensitive measuring for high-resistance faults and one stage for high-
    current faults and fast fault clearance
•  Breaker-failure protection (50BF)
•  Phase and ground over current protection with directional element (50, 50N, 51, 51N, 67, 67N)
•  Phase-selective intertripping (85)
•  Overload protection (49)
•  Over/under voltage protection (59/27)
•  Over/under frequency protection (81O/U)
•  Auto-reclosure single/three-pole (79)

Control function

•  Command and inputs for control of CB and disconnectors (isolators)

Monitoring functions

•  Self-supervision of the relay
•  Trip circuit supervision (74TC)
•  8 oscillographic fault records
•  CT-secondary current supervision
•  Event logging / fault logging
•  Switching statistics

Front design

•  User-friendly local operation
•  PC front port for convenient relay setting
•  Function keys and 8 LEDs for local alarm

Communication interfaces

•  1 serial protection data (R2R) interface
•  Front interface for PC connection
•  System interface

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

•  Service / modem interface (rear)
•  Time synchronization via IRIG-B, DCF77 or system interface

Features

•  Browser-based commissioning tool
•  Direct connection to digital communication networks