The relay can be typically used in radial or meshed MV and LV networks as differential protection of power generator/motor or transformer. The phase and amplitude adaptation of the current for differential protection can be achieved can be done either either by internal compensation or through external adapters.
Specifications
Key: 
standard 
optional 
alternative
Applications
- Generator
- Motor
- Transformer
Protection functions
- Underimpedance (21)
- Pt100 thermometric probes (26)
- Undervoltage (27)
- Positive seq. undervoltage (27V1)
- Directional active overpower (32P)
- Phase undercurrent (37)
- Directional active underpower (37P)
- Loss of field (40)
- Negative sequence overcurrent for Generator (46G)
- Negative sequence overcurrent for Motor (46M)
- Phase reversal (47)
- Thermal image for Motor / Generator (49MG)
- Phase overcurrent (50/51)
- Measured residual overcurrent (50N(1)/51N(1))
- Measured residual overcurrent (50N(2)/51N(2))
- Calculated residual overcurrent (50N(Calc)/51N(Calc))
- Locked rotor (51LR(48)/14)
- Voltage-controlled overcurrent (51V)
- Minimum power factor (55)
- Overvoltage (59)
- Residual overvoltage (59N)
- Negative seq. overvoltage (59V2)
- Low impedance restricted ground fault (64REF)
- Ground directional overcurrent (67N)
- Underfrequency & overfrequency (81U 81O)
- Differential protection for generators and motors (87G/87M)
- High impedance restricted earth fault (87NHIZ)
- Biased differential for transformer (87T)
- Breaker failure (BF)
Monitoring and control functions
- CB diagnostic
- Cold Load Pickup (CLP)
- CTs monitoring (74CT)
- Digital Fault recording (DFR)
- Fault and event logging (SER & SFR)
- Logic selectivity
- Multiple setting profiles
- Programmable Logic Controller
- Second harmonic restraint
- Self-test
- Trip circuit supervision (74TCS)
- VTs monitoring (74VT)
Hardware
- 100 V standard voltage inputs
- 16 binary inputs + 8 output relays + 16 LEDs
- 19-inch “4U” rack mounting
- 400 V standard voltage inputs
- Auxiliary power supply 110-230 Vac/dc
- Auxiliary power supply 24-110 Vac/dc
- Flush mounting
- Nominal current 1/5 A selectable by DIP-switch
- One TX (RJ45) port and one FX (Fibra ottica) port + RS485
- One TX (RJ45) port + one FX (optical port) port + RS485
- RS485 port
- Standard CT amperometric inputs 1/5 A
- Two FX (optical fiber) port + RS485
- Two TX (RJ45) port + RS485
Communication
- IEC 61850 Protocol
- Modbus RTU RS232 protocol
- Modbus RTU RS485
- Modbus RTU RS485 / IEC 870-5-103
- Modbus RTU RS485 / IEC 870-5-103 / DNP3 protocol
- Modbus TCP/IP Protocol