ABB REG670 Technical Manual page 1268

Section 25
Inverse time characteristics
1262
Table 972: 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
 
U − U >
 32 ⋅ − 0.5 
 
>
U
EQUATION1437-SMALL V2 EN
Type C curve:
k ⋅ 480
t =
3.0
 
U − U >
 32 ⋅ − 0.5 
 
U >
EQUATION1438-SMALL V2 EN
Programmable curve:
×
k A
= +
t
P
æ ö
- >
U U
ç × - ÷
B C
è ø
>
U
EQUATION1439-SMALL V1 EN
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
k = (0.05-1.10) in steps of
0.01
A = (0.005-200.000) in
steps of 0.001
D
B = (0.50-100.00) in steps
of 0.01
C = (0.0-1.0) in steps of
0.1
D = (0.000-60.000) in
steps of 0.001
P = (0.000-3.000) in steps
of 0.001
1MRK502052-UEN B
Accuracy
±5.0% or ±45 ms
whichever is
greater
Technical manual