Table 70. Inverse time characteristics for residual 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
Class 5 +40 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
Bay control REC650
1MRK 511 249-BEN -
Product version: 1.1
Issued: February 2011
ABB
75
Summary of Contents for REC650 ANSI
Page 1: ...Relion 650 series Bay control REC650 Product Guide...
Page 81: ...81...
