SEMOD116978-2 v11
Table 163. 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-US
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
0.035
32
0.5
n
n
k
t
U
U
U
IECEQUATION2423 V2 EN-US
k = (0.05-1.10) in steps of 0.01
Type C curve:
3.0
480
0.035
32
0.5
n
k
t
U U
U
×
=
+
-
>
æ
ö
×
-
ç
÷
>
è
ø
IECEQUATION2421 V1 EN-US
k = (0.05-1.10) in steps of 0.01
Table 164. 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-US
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
0.055
32
0.5
×
=
+
< -
×
-
<
æ
ö
ç
÷
è
ø
k
t
U
U
U
EQUATION1432-SMALL V1 EN-US
U< = U
set
U = U
measured
k = (0.05-1.10) in steps of 0.01
Line distance protection REL650
1MRK 506 384-BEN H
Version 2.2
108
Hitachi Power Grids
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