ABB 1MRK002826-AG - Page 136

SEMOD116978-2 v10
Table 190. 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 ±5.0% or ±45 ms
whichever is greater
Type B curve:
2.0
480
0.035
32 0.5
n
n
k
t
UU
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
Programmable curve:
×
= +
- >
× -
>
æ ö
ç ÷
è ø
P
k A
t D
U U
B C
U
EQUATION1439-SMALL V1 EN-US
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
Generator protection REG670
1MRK 502 074-BEN M
Version 2.2
136 Hitachi Power Grids
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