Hitachi Relion 670 Series Product Manual page 99

Phasor measurement unit RES670
Version 2.2
Table 150. 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 Energy
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 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 511 410-BEN P
Accuracy
±5.0% or ±45 ms
whichever is greater
99