ABB RELION 620 Series Technical Manual page 20

Table of contents
14
Monitored data............................................................................466
Technical data............................................................................ 466
High-impedance differential protection 87....................................... 466
Identification............................................................................... 466
Function block............................................................................ 467
Functionality............................................................................... 467
Operation principle..................................................................... 467
Application.................................................................................. 469
Current transformer requirements for differential protection ......478
Example calculations for busbar high-impedance differential
protection....................................................................................483
Signals........................................................................................486
Settings.......................................................................................487
Monitored data............................................................................487
Technical data............................................................................ 487
Impedance protection........................................................................... 488
Phase distance protection 21P........................................................488
Identification............................................................................... 488
Function block............................................................................ 489
Functionality............................................................................... 489
Operation principle..................................................................... 490
Application.................................................................................. 497
Signals........................................................................................499
Settings.......................................................................................500
Monitored data............................................................................502
Technical data............................................................................ 502
Out of step 78.................................................................................. 503
Identification............................................................................... 503
Function block............................................................................ 503
Functionality............................................................................... 503
Operation principle..................................................................... 504
Application.................................................................................. 509
Signals........................................................................................510
Settings.......................................................................................511
Monitored data............................................................................512
Technical data............................................................................ 512
Three-phase underexcitation protection 40..................................... 513
Identification............................................................................... 513
Function block............................................................................ 513
Functionality............................................................................... 513
620 series ANSI
Technical Manual