ABB RELION 670 Series Technical Manual page 1400

Section 26
Inverse time characteristics
Table
1085:
Function
Type A curve:
=
t
æ
VPickup V
ç
è
EQUATION1658 V1 EN-US
V = V
measured
Type B curve:
=
t
æ
ç
32
è
EQUATION1659 V1 EN-US
V = V
measured
Programmable curve:
é
ê
ê
=
t
ê
æ
ê
ç
B
ë è
EQUATION1660 V1 EN-US
V = V
measured
1394
Inverse time characteristics for undervoltage protection
td
ö
-
÷
ø
VPickup
×
td 480
+
0.055
2.0
ö
-
VPickup V
× -
÷
0.5
ø
VPickup
ù
ú
×
td A
ú
+
D
ú
P
ö
-
VPickup V
ú
× -
÷
C
ø û
VPickup
Range or value
td = (0.05-1.10) in steps of 0.01
td = (0.05-1.10) in steps of 0.01
td = (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
1MRK 502 066-UUS B
Accuracy
±5.0% or ±45 ms
whichever is greater
Technical manual