ABB Relion 670 Series Product Manual page 137

Generator protection REG670
Version 2.2
Table 191. Inverse time characteristics for undervoltage protection
Function
Type A curve:
k
=
t
æ ö
< -
U U
ç ÷
è ø
<
U
EQUATION1431-SMALL V1 EN-US
U< = U
set
U = U
measured
Type B curve:
×
k 480
=
t
2.0
æ ö
< -
U U
ç × - ÷
32 0.5
è ø
<
U
EQUATION1432-SMALL V1 EN-US
U< = U
set
U = U
measured
Programmable curve:
é ù
ê ú
×
k A
ê ú
=
t
ê ú
P
æ ö
< -
U U
ê ç × - ÷ ú
B C
ë è ø û
<
U
EQUATION1433-SMALL V1 EN-US
U< = U
set
U = U
measured
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
+
0.055
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
D
P = (0.000-3.000) in steps of 0.001
© Copyright 2017 Hitachi Power Grids. All rights reserved
1MRK 502 074-BEN M
Accuracy
±5.0% or ±45 ms
whichever is greater
137