ABB REG650 Product Manual page 61

Generator protection REG650
Product version: 1.3
Table 76. RI and RD type inverse time characteristics
Function
RI type inverse characteristic
1
= ×
t k
0.236
-
0.339
I
EQUATION1137-SMALL V1 EN
I = I /I
measured set
RD type logarithmic inverse characteristic
æ ö
I
- ç × ÷
5.8 1.35 In
=
t
è ø
k
EQUATION1138-SMALL V1 EN
I = I /I
measured set
Table 77. Inverse time characteristics for 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
ABB
Range or value
k = (0.05-999) in steps of 0.01
k = (0.05-999) in steps of 0.01
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
1MRK 502 050-BEN B
Accuracy
Accuracy
±5% +60 ms
61