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Line distance protection REL670
Version 2.2
Table 218. 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-US
U> = U
set
U = U
measured
Type B curve:
k
⋅
480
t
=
2.0
U
−
U
>
32
⋅
−
0.5
U
>
EQUATION1437-SMALL V2 EN-US
Type C curve:
k
⋅
480
t
=
3.0
U
−
U
>
32
⋅
−
0.5
>
U
EQUATION1438-SMALL V2 EN-US
Programmable curve:
×
k A
=
+
t
D
P
æ
ö
-
>
U
U
ç
×
-
÷
B
C
è
ø
>
U
EQUATION1439-SMALL V1 EN-US
154
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
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
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1MRK 506 372-BEN Q
Accuracy
±5.0% or ±45 ms
whichever is greater
Hitachi Energy
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