ABB REC650 - Page 625

Table 576: Inverse time characteristics for overvoltage protection
Function Range or value Accuracy
Type A curve:
=
- >
>
æ ö
ç ÷
è ø
t
k
U U
U
EQUATION1436-SMALL V1 EN
U> = U
set
U = U
measured
k = (0.05-1.10) in
steps of 0.01
±5% +60 ms
Type B curve:
2.0
480
32 0.5 0.035
=
×
- >
× - -
>
æ ö
ç ÷
è ø
t
k
U U
U
EQUATION1437-SMALL V1 EN
k = (0.05-1.10) in
steps of 0.01
Type C curve:
3.0
480
32 0.5 0.035
=
×
- >
× - -
>
æ ö
ç ÷
è ø
t
k
U U
U
EQUATION1438-SMALL V1 EN
k = (0.05-1.10) in
steps of 0.01
Table 577: Inverse time characteristics for undervoltage protection
Function
Range or value Accuracy
Type A curve:
=
< -
<
æ ö
ç ÷
è ø
k
t
U U
U
EQUATION1431-SMALL V1 EN
U< = U
set
U = UV
measured
k = (0.05-1.10) in
steps of 0.01
±5% +60 ms
Type B curve:
2.0
480
0.055
32 0.5
×
= +
< -
× -
<
æ ö
ç ÷
è ø
k
t
U U
U
EQUATION1432-SMALL V1 EN
U< = U
set
U = U
measured
k = (0.05-1.10) in
steps of 0.01
1MRK 511 287-UEN A Section 19
Time inverse characteristics
619
Technical manual