ABB RELION REX640 Technical Manual page 25

REX640
Technical Manual
Stabilized and instantaneous differential protection for two-
winding transformers TR2PTDF................................................ 591
Identification......................................................................... 591
Function block...................................................................... 592
Functionality......................................................................... 592
Analog channel configuration............................................... 592
Operation principle............................................................... 593
Application............................................................................606
CT connections and transformation ratio correction.............618
Signals..................................................................................622
Settings................................................................................ 623
Monitored data..................................................................... 625
Technical data...................................................................... 627
Stabilized and instantaneous differential protection for two-
or three-winding transformers TR3PTDF.................................. 628
Identification......................................................................... 628
Function block...................................................................... 628
Functionality......................................................................... 628
Analog channel configuration............................................... 629
Operation principle............................................................... 629
Current transformer connections and transformation ratio
correction..............................................................................642
Application............................................................................644
Recommendations for current transformers.........................651
Signals..................................................................................654
Settings................................................................................ 655
Monitored data..................................................................... 657
Technical data...................................................................... 660
Numerical stabilized low-impedance restricted earth-fault
protection LREFPNDF...............................................................660
Identification......................................................................... 660
Function block...................................................................... 660
Functionality......................................................................... 661
Analog channel configuration............................................... 661
Operation principle............................................................... 661
Application............................................................................665
Signals..................................................................................670
Settings................................................................................ 670
Monitored data..................................................................... 671
Technical data...................................................................... 672
High-impedance based restricted earth-fault protection
HREFPDIF.................................................................................672
Identification......................................................................... 672
Function block...................................................................... 672
Table of contents
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