Function overview

•  Differential protection for 2- up to 5-winding transformers (3-/1-phase)
•  Differential protection for motors and generators
•  Differential protection for short 2 up to 5 terminal lines
•  Differential protection for busbars up to 12 feeders (phase-segregated or with summation CT)

Protection functions

•  Differential protection with phase-segregated measurement
•  Sensitive measuring for low-fault currents
•  Fast tripping for high-fault currents
•  Restraint against inrush of transformer
•  Phase /ground overcurrent protection
•  Overload protection with or without temperature measurement
•  Negative-sequence protection
•  Breaker failure protection
•  Low/high-impedance restricted ground fault (REF)
•  Voltage protection functions (7UT613/633)

Control function

•  Commands for control of circuit-breakers and isolators
•  7UT63x: Graphic display shows position of switching elements, local/remote switching by key-operated switch
•  Control via keyboard, binary inputs, DIGSI 4 or SCADA system
•  User-defined logic with CFC

Monitoring functions

•  Self-supervision of the relay
•  Trip circuit supervision
•  Oscillographic fault recording
•  Permanent differential and restraint current measurement, extensive scope of operational values

Communication interfaces

•  PC front port for setting with DIGSI 4
•  System interface

ü  IEC 61850 Ethernet
ü  IEC 60870-5-103 protocol
ü  PROFIBUS DP
ü  MODBUS
ü  DNP 3

•  Service interface for DIGSI 4 (modem)/ temperature monitoring (thermo-box)
•  Time synchronization via IRIG-B/DCF 77