ABB Relion 620 Series - Page 690

Table 647: Settings for example A and B
Settings Curve A Curve B
Voltage start value 0.9 · Un 0.9 · Un
Active coordinates 3 5
Voltage level 1 0.2 · Un 0 · Un
Recovery time 1 500 ms 150 ms
Voltage level 2 0.8 · Un 0.7 · Un
Recovery time 2 1000 ms 150 ms
Voltage level 3 0.9 · Un 0.7 · Un
Recovery time 3 10000 ms 700 ms
Voltage level 4 - 0.9 · Un
Recovery time 4 - 1500 ms
Voltage level 5 - 0.9 · Un
Recovery time 5 - 3000 ms
It is necessary that the last active Voltage level X setting is set greater
than or equal to Voltage start value . Settings are not accepted if the last
active Voltage level X setting is not set greater than or equal to Voltage
start value .
Figure 361 describes an example of operation of LVRTPTUV protection function set
to operate with Num of start phases set to “Exactly 2 of 3” and Voltage selection as
“Lowest Ph-to-Ph” voltage.
Protection functions
1MRS757644 H
690 620 series
Technical Manual