ABB RES670 Technical Manual page 13

Phasor measurement unit RES670 2.2 ANSI
Technical manual
Design........................................................................................ 297
Technical data................................................................................. 299
Section 10 Frequency protection.........................................................301
Underfrequency protection SAPTUF (81).............................................301
Identification.................................................................................... 301
Functionality.................................................................................... 301
Function block................................................................................. 301
Signals.............................................................................................302
Settings............................................................................................302
Operation principle.......................................................................... 303
Measurement principle............................................................... 303
Time delay.................................................................................. 303
Voltage dependent time delay.................................................... 304
Blocking...................................................................................... 306
Design........................................................................................ 306
Technical data................................................................................. 307
Overfrequency protection SAPTOF (81)...............................................308
Identification.................................................................................... 308
Functionality.................................................................................... 308
Function block................................................................................. 309
Signals.............................................................................................309
Settings............................................................................................310
Operation principle.......................................................................... 310
Measurement principle............................................................... 310
Time delay.................................................................................. 311
Blocking...................................................................................... 311
Design........................................................................................ 311
Technical data................................................................................. 312
Rate-of-change of frequency protection SAPFRC (81)........................ 312
Identification.................................................................................... 313
Functionality.................................................................................... 313
Function block................................................................................. 313
Signals.............................................................................................313
Settings............................................................................................314
Operation principle.......................................................................... 314
Measurement principle............................................................... 315
Time delay.................................................................................. 315
Blocking...................................................................................... 315
Design........................................................................................ 316
Table of contents
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