ABB Relion 670 Series Technical Reference Manual page 20

Table of contents
14
Setting parameters..........................................................................545
Technical data.................................................................................545
Loss of voltage check LOVPTUV (27)..................................................546
Introduction......................................................................................546
Principle of operation.......................................................................546
Function block.................................................................................547
Input and output signals..................................................................548
Setting parameters..........................................................................548
Technical data.................................................................................549
Section 9 Frequency protection.........................................................551
Underfrequency protection SAPTUF (81).............................................551
Introduction......................................................................................551
Principle of operation.......................................................................551
Measurement principle...............................................................552
Time delay..................................................................................552
Voltage dependent time delay....................................................553
Blocking......................................................................................554
Design........................................................................................554
Function block.................................................................................555
Input and output signals..................................................................555
Setting parameters..........................................................................556
Technical data.................................................................................557
Overfrequency protection SAPTOF (81)...............................................557
Introduction......................................................................................558
Principle of operation.......................................................................558
Measurement principle...............................................................558
Time delay..................................................................................558
Blocking......................................................................................559
Design........................................................................................559
Function block.................................................................................560
Input and output signals..................................................................560
Setting parameters..........................................................................561
Technical data.................................................................................561
Rate-of-change frequency protection SAPFRC (81)............................561
Introduction......................................................................................562
Principle of operation.......................................................................562
Measurement principle...............................................................562
Time delay..................................................................................563
Blocking......................................................................................563
Technical reference manual