Differential protection relay Siemens Power Transmission Distribution
SIPROTEC 4 7UT6 are used for fast and selective fault clearing of short-circuits in transformers of all voltage levels and also in rotating electric machines like motors and generators, for short lines and busbars. The protection relay can be parameterized for use with three-phase and single-phase transformers.
Differential protection for
2- up to 5-winding transformers (3-/1-phase)
motors and generators
short 2 up to 5 terminal lines
busbars up to 12 feeders (phase-segregated or with summation CT)
Protection functions
Differential protection with phase-segregated measurement
Sensitivemeasuring for low-fault currents
Fast tripping for high-fault currents
Restraint against inrush of transformer
Phase/earth overcurrent protection
Overload protection with or without temperature measurement
Negative-sequence protection
Breaker failure protection
Low/high-impedance restricted earth fault (REF)
Voltage protection functions (7UT613/633)
Flexible communication interface, eg. IEC 61850 Ethernet protocol.
