ABB Relion Technical Manual page 17

Technical manual
Time delay.................................................................................. 322
Blocking...................................................................................... 322
Design........................................................................................ 322
Technical data................................................................................. 322
Overfrequency protection SAPTOF (81)...............................................323
Identification.................................................................................... 323
Functionality.................................................................................... 323
Function block................................................................................. 324
Signals.............................................................................................324
Settings............................................................................................324
Monitored data.................................................................................324
Operation principle.......................................................................... 325
Measurement principle............................................................... 325
Time delay.................................................................................. 326
Blocking...................................................................................... 326
Design........................................................................................ 326
Technical data................................................................................. 327
Rate-of-change frequency protection SAPFRC (81)............................ 327
Identification.................................................................................... 327
Functionality.................................................................................... 327
Function block................................................................................. 328
Signals.............................................................................................328
Settings............................................................................................328
Operation principle.......................................................................... 329
Measurement principle............................................................... 329
Time delay.................................................................................. 329
Design........................................................................................ 330
Technical data................................................................................. 330
Section 11 Secondary system supervision..........................................331
Fuse failure supervision SDDRFUF......................................................331
Identification.................................................................................... 331
Functionality.................................................................................... 331
Function block................................................................................. 332
Signals.............................................................................................332
Settings............................................................................................333
Monitored data.................................................................................334
Operation principle.......................................................................... 334
Zero and negative sequence detection...................................... 334
Delta current and delta voltage detection................................... 335
Table of contents
11