Differential protection for 2–3 winding transformers (3-/1-phase)
Differential protection for motors, generators, and short lines
Busbar differential protection (up to 9 feeders)
Phase- and earth-fault overcurrent protection
Overload protection with temperature monitoring
Negative-sequence and breaker failure protection
Restricted earth-fault (REF) protection (low/high impedance)
Over/undervoltage, over/underfrequency, and overexcitation protection
Reverse/forward power protection
Fuse failure monitoring
Integrated thermal monitoring via thermo-boxes (hot-spot calculation)
Programmable logic (CFC) for automation/interlocking
Communication: IEC 61850, IEC 60870-5-103, PROFIBUS-FMS/DP, MODBUS, DNP 3.0
Time sync via IRIG-B/DCF 77
DIGSI 4 compatibility for settings, monitoring, and control
Protection Functions:
Distance protection with 6 measuring systems (21/21N)
High resistance ground-fault protection (50N, 51N, 67N)
Tele (pilot) protection (85)
Fault locator (FL)
Power swing detection/tripping (68/68T)
Phase overcurrent protection (50/51)
STUB bus overcurrent (50STUB)
Switch-onto-fault (50HS)
Over/undervoltage (59/27)
Over/underfrequency (81O/U)
Auto-reclosure (79)
Synchro-check (25)
Breaker failure protection (50BF)
Control Functions:
Command control for circuit breakers and isolators
Monitoring Functions:
Trip circuit supervision (74TC)
Relay self-supervision
Measured-value supervision
Event/fault logging
Oscillographic fault recording
Switching statistics
Front Design:
Numeric keypad for easy local operation
Alarm LEDs
PC front port for configuration
Function keys
Communication Interfaces:
Front interface for PC connection
System interface: IEC 61850 / IEC 60870-5-103 / PROFIBUS-FMS/DP / DNP 3.0
2 serial data interfaces for pilot protection
Rear modem/service interface
Time sync via IRIG-B, DCF77, or system interface
Hardware:
Binary inputs: 8 / 16 / 24
Output relays: 16 / 24 / 32
Optional high-speed trip outputs: 5
