ABB RELION REX640 Technical Manual page 826

Section 4
Protection functions
820
GUID-4793314F-DFC1-4896-A349-72CC9DF11078 V1 EN
Figure 446: Low voltage ride through example curve B
Table 777: Settings for example A and B
Settings
Voltage start value
Active coordinates
Voltage level 1
Recovery time 1
Voltage level 2
Recovery time 2
Voltage level 3
Recovery time 3
Voltage level 4
Recovery time 4
Voltage level 5
Recovery time 5
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 447 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.
Curve A
0.9 · Un
3
0.2 · Un
500 ms
0.8 · Un
1500 ms
0.9 · Un
10000 ms
-
-
-
-
1MRS759142 C
Curve B
0.9 · Un
5
0 · Un
150 ms
0.7 · Un
150 ms
0.7 · Un
700 ms
0.9 · Un
1500 ms
0.9 · Un
3000 ms
REX640
Technical Manual