ABB RET650 Technical Manual page 639

1MRK 504 135-UEN A
Technical manual
Table 562: 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
Table 563: 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
Time inverse characteristics
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
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
Section 21
Accuracy
±5% +60 ms
Accuracy
±5% +60 ms
633