Technical Specifications
Main Function: Feeder and overcurrent protection for all voltage levels
Inputs & Outputs:
4 current transformers, 4 voltage transformers
11–59 binary inputs, 9–33 binary outputs
Hardware: Modular design with expandable I/O; available with large, small, or no display
Protection Functions:
Directional/non-directional overcurrent protection
Ground fault detection (3I0>, V0>, transient, harmonic, intermittent)
Capacitor bank protection (overcurrent, overload, unbalance, differential)
Over/undervoltage, frequency, power, and arc protection
Fault locator, automatic reclosing (AREC), CB failure protection
Control & Automation:
Graphical logic editor (CFC), point-on-wave switching, interlocking, synchrocheck
Control of circuit breakers and power transformers
Communication:
Fixed Ethernet (RJ45) for DIGSI 5 and IEC 61850
Up to 4 pluggable modules: IEC 61850-8-1, IEC 60870-5-103/104, DNP3, Modbus TCP, PROFINET IO
PRP/HSR redundancy, IEEE C37.94 optical link
Web access & cybersecurity (RBAC, signed firmware, event logging)
Additional Features:
Phasor Measurement Unit (PMU)
IEEE 1588 time sync
Fault recording (up to 80 s @ 8 kHz)
Conformal coating standard
Overall Differential Protection (87/50G)
Restricted Earth Fault Protection (87REF)
Earth Fault (50G)
CT Supervision (CT50)
Fault Clearance Monitor (87/50BF)
Instrumentation and Monitoring
IEC 61850 Communication Option
Eight Setting Groups
Password Protection
Self-Monitoring
Fault, Event & Waveform Records
4xI and 4xV inputs
Detached display for flexible installation
1-/3-pole tripping capability
Protection Functions:
Distance protection (21/21N)
High resistance earth-fault protection (50N, 51N, 67N)
Earth-fault detection in isolated and resonant-earthed networks
Tele (pilot) protection (85)
Fault locator (FL)
Power-swing detection/tripping (68/68T)
Phase-overcurrent protection (50/51)
Switch-onto-fault protection (50HS)
STUB bus overcurrent protection (50STUB)
Control & Monitoring:
Commands for circuit breaker (CB) and isolator control
Trip circuit supervision (74TC)
Self-supervision and measured-value monitoring
Event and fault logging
Communication & Software:
IEC 61850, IEC 60870-5-103, PROFIBUS, MODBUS
DIGSI 4 configuration software
Reliable Siemens SIPROTEC 4 platform with proven performance in global installations
Protection Functions:
Distance protection with 6 measuring systems (21/21N)
High resistance earth-fault protection (50N, 51N, 67N)
Earth-fault detection in isolated and resonant-earthed systems
Tele (pilot) protection (85)
Fault locator (FL)
Power swing detection/tripping (68/68T)
Phase-overcurrent protection (50/51)
Switch-onto-fault protection (50HS)
STUB bus overcurrent protection (50STUB)
Overvoltage/undervoltage protection (59/27)
Over/underfrequency protection (81O/U)
Auto-reclosure (79)
Synchro-check (25)
Breaker failure protection (50BF)
Thermal overload protection (49)
Control Functions:
Commands for circuit breaker and isolator control
Monitoring Functions:
Trip circuit supervision (74TC)
Relay self-supervision
Measured-value supervision
Event logging and fault logging
Oscillographic fault recording
Switching statistics
Additional Features:
4xI, 4xV inputs
Text display
1-/3-pole tripping
Compatible with DIGSI 4 engineering software
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
