ABB Relion REL650 Series Product Manual page 109

Line distance protection REL650
Version 2.2
Table 165. 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
Hitachi Power Grids
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
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1MRK 506 384-BEN H
Accuracy
±5% +70 ms
109