Application: Transformers (1-/3-phase), motors, generators, short lines, busbars (up to 7 feeders)
Protection Functions:
Differential protection (phase-segregated)
Sensitive stage for low-fault currents
Fast tripping for high-fault currents
Transformer inrush restraint
Phase and ground overcurrent protection
Overload protection with/without temperature input
Negative-sequence protection
Breaker failure protection (50BF)
Low/high-impedance restricted earth fault (REF) protection
Control Functions:
Commands for circuit-breaker and isolator control
Local/remote control via keyboard, binary inputs, DIGSI 4, or SCADA
User-defined logic with CFC (Custom Function Chart)
Monitoring Functions:
Self-supervision and trip-circuit supervision
Oscillographic fault recording
Continuous differential and restraint current measurement
Transformer thermal monitoring via external thermo-boxes
Communication Interfaces:
Front PC port for DIGSI 4 configuration
IEC 61850 Ethernet, IEC 60870-5-103, PROFIBUS-FMS/DP, MODBUS, DNP 3.0
Service/modem interface, temperature monitoring connection
Time synchronization via IRIG-B / DCF 77
Features:
Integrated thermal replica for winding supervision
Flexible parameterization for various transformer configurations
Proven SIPROTEC 4 platform with more than 1 million units in service worldwide
