ABB RES670 Technical Manual page 901

1MRK 511 408-UUS A
Phasor measurement unit RES670 2.2 ANSI
Technical manual
Table 696: Inverse time characteristics for undervoltage protection
Function
Type A curve:
td
=
t
æ ö
-
VPickup V
ç ÷
è ø
VPickup
EQUATION1658 V1 EN-US
V = V
measured
Type B curve:
×
td 480
=
t
æ
-
VPickup V
× -
ç
32 0.5
è
VPickup
EQUATION1659 V1 EN-US
V = V
measured
Programmable curve:
é
ê
×
td A
ê
=
t
ê
æ
-
VPickup V
ê
ç × -
B C
ë è
VPickup
EQUATION1660 V1 EN-US
V = V
measured
Range or value
td = (0.05-1.10) in steps
of 0.01
td = (0.05-1.10) in steps
of 0.01
+
0.055
2.0
ö
÷
ø
td = (0.05-1.10) in steps
of 0.01
A = (0.005-200.000) in
ù
steps of 0.001
ú
B = (0.50-100.00) in
ú
+
D
steps of 0.01
ú
P
ö
C = (0.0-1.0) in steps of
ú
÷
0.1
ø û
D = (0.000-60.000) in
steps of 0.001
P = (0.000-3.000) in
steps of 0.001
Section 26
Inverse time characteristics
Accuracy
±5.0% or ±45 ms
whichever is greater
895