Function overview

Protection functions

 • Non-switched distance protection with 6 measuring systems (21/21N)
 • High resistance ground-fault protection for single and three-pole tripping (50N, 51N, 67N)
 • Ground-fault detection in isolated and resonant-grounded networks
 • Tele (pilot) protection (85)
 • Fault locator (FL)
 • Power-swing detection/tripping (68/68T)
 • Phase overcurrent protection (50/51/67)
 • Switch-onto-fault protection (50HS)
 • STUB bus overcurrent protection (50STUB)
 • Overvoltage/under voltage protection (59/27)
 • Over/under frequency protection 81O/U)
 • Auto-reclosure (79)
 • Synchro-check (25)
 • Breaker failure protection (50BF)
 • Thermal overload protection (49)

Control function

• Commands for control of CBs and isolators

Monitoring functions

• Trip circuit supervision (74TC)
• Self-supervision of the relay
• Measured-value supervision
• Event logging/fault logging
• Oscillographic fault recording
• Switching statistics

Front design

• Easy operation with numeric keys
• Function keys
• LEDs for local alarm
• PC front port for convenient relay setting

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

• 1 serial protection data interface for teleprotection
• Rear-side service/modem interface
• Time synchronization via

ü  IRIG-B or DCF 77 or
ü  system interface

Hardware

• Binary inputs: 8/16/24
• Output relays: 16/24/32
• High-speed trip outputs: 5 (optional)