ABB REG650 Product Manual page 62

Generator protection REG650
Product version: 1.3
Table 78. Inverse time characteristics for undervoltage protection
Function
Type A curve:
k
=
t
æ ö
< -
U U
ç ÷
è ø
<
U
EQUATION1431-SMALL V1 EN
U< = U
set
U = UV
measured
Type B curve:
×
k 480
=
t
2.0
æ ö
< -
U U
ç × - ÷
32 0.5
è ø
<
U
EQUATION1432-SMALL V1 EN
U< = U
set
U = U
measured
Table 79. Inverse time characteristics for residual overvoltage protection
Function
Type A curve:
k
=
t
æ ö
- >
U U
ç ÷
è ø
>
U
EQUATION1436-SMALL V1 EN
U> = U
set
U = U
measured
Type B curve:
×
k 480
=
t
2.0
æ ö
- >
U U
ç × - ÷ -
32 0.5
è ø
>
U
EQUATION1437-SMALL V1 EN
Type C curve:
×
k 480
=
t
3.0
æ ö
- >
U U
ç × - ÷ -
32 0.5
è ø
>
U
EQUATION1438-SMALL V1 EN
62
Range or value
k = (0.05-1.10) in steps of 0.01
k = (0.05-1.10) in steps of 0.01
+
0.055
Range or value
k = (0.05-1.10) in steps of
0.01
k = (0.05-1.10) in steps of
0.01
0.035
k = (0.05-1.10) in steps of
0.01
0.035
Accuracy
±5% +70 ms
1MRK 502 050-BEN B
Accuracy
±5% +60 ms
ABB