Transformer differential protection rapidly detects and isolates internal faults by comparing currents entering and leaving transformer windings, ensuring system integrity and preventing damage.
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 protectionUp to 500000 records Archive
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
IEC 61850 Ethernet
IEC 60870-5-103 protocol
PROFIBUS DP
MODBUS
DNP 3
Service interface for DIGSI 4 (modem)/ temperature monitoring (thermo-box)