ABB RELION 670 Series Technical Manual page 21

9.7.3 Function block.................................................................................................................................. 661
9.7.4 Signals................................................................................................................................................ 661
9.7.5 Settings.............................................................................................................................................. 661
9.7.6 Operation principle..........................................................................................................................662
9.7.7 Technical data.................................................................................................................................. 664
Section 10 Frequency protection..........................................................................................665
10.1 Underfrequency protection SAPTUF (81)........................................................................................ 665
10.1.1 Identification.................................................................................................................................... 665
10.1.2 Functionality..................................................................................................................................... 665
10.1.3 Function block.................................................................................................................................. 665
10.1.4 Signals................................................................................................................................................666
10.1.5 Settings............................................................................................................................................. 666
10.1.6 Monitored data.................................................................................................................................667
10.1.7 Operation principle..........................................................................................................................667
10.1.7.1 Measurement principle................................................................................................................667
10.1.7.2 Time delay...................................................................................................................................... 667
10.1.7.3 Voltage dependent time delay...................................................................................................668
10.1.7.4 Blocking..........................................................................................................................................669
10.1.7.5 Design.............................................................................................................................................669
10.1.8 Technical data.................................................................................................................................. 670
10.2 Overfrequency protection SAPTOF (81)........................................................................................... 671
10.2.1 Identification.....................................................................................................................................671
10.2.2 Functionality......................................................................................................................................671
10.2.3 Function block.................................................................................................................................. 672
10.2.4 Signals................................................................................................................................................ 672
10.2.5 Settings.............................................................................................................................................. 672
10.2.6 Monitored data.................................................................................................................................673
10.2.7 Operation principle..........................................................................................................................673
10.2.7.1 Measurement principle................................................................................................................673
10.2.7.2 Time delay...................................................................................................................................... 673
10.2.7.3 Blocking.......................................................................................................................................... 674
10.2.7.4 Design............................................................................................................................................. 674
10.2.8 Technical data...................................................................................................................................675
10.3 Rate-of-change frequency protection SAPFRC (81)...................................................................... 675
10.3.1 Identification.................................................................................................................................... 675
10.3.2 Functionality..................................................................................................................................... 675
10.3.3 Function block.................................................................................................................................. 676
10.3.4 Signals................................................................................................................................................ 676
10.3.5 Settings..............................................................................................................................................676
10.3.6 Monitored data.................................................................................................................................677
10.3.7 Operation principle..........................................................................................................................677
10.3.7.1 Measurement principle................................................................................................................ 677
Technical manual
Table of contents
15