Table 165. 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-US
U> = U
set
U = U
measured
k = (0.05-1.10) in steps of 0.01
±5% +70 ms
Type B curve:
2.0
480
32
0.5
=
⋅
−
>
⋅
−
0.035
+
>
t
k
U U
U
EQUATION1437-SMALL V2 EN-US
k = (0.05-1.10) in steps of 0.01
Type C curve:
3.0
480
32
0.5
=
⋅
⋅
−
−
>
0.035
+
>
t
k
U U
U
EQUATION1438-SMALL V2 EN-US
k = (0.05-1.10) in steps of 0.01
Line distance protection REL650
1MRK 506 384-BEN H
Version 2.2
Hitachi Power Grids
109
© 2017 - 2021 Hitachi Power Grids. All rights reserved