ABB Relion 670 series Product Manual page 74

Line distance protection REL670 ANSI
Pre-configured
Product version: 1.2
Table 87. Inverse time characteristics for undervoltage protection
Function
Type A curve:
td
=
t
æ ö
-
VPickup V
ç ÷
è ø
VPickup
EQUATION1658 V1 EN
V = V
measured
Type B curve:
×
td 480
=
t
æ ö
-
VPickup V
ç × - ÷
32 0.5
è ø
VPickup
EQUATION1659 V1 EN
V = V
measured
Programmable curve:
é
ê
×
td A
ê
=
t
ê
P
æ ö
-
VPickup V
ê
ç × - ÷
B C
ë è ø û
VPickup
EQUATION1660 V1 EN
V = V
measured
74
Range or value
td = (0.05-1.10) in steps of 0.01 unless
otherwise stated
td = (0.05-1.10) in steps of 0.01 unless
otherwise stated
+
0.055
2.0
td = (0.05-1.10) in steps of 0.01 unless
otherwise stated
ù
A = (0.005-200.000) in steps of 0.001
ú
B = (0.50-100.00) in steps of 0.01
ú
C = (0.0-1.0) in steps of 0.1
+
D
ú
D = (0.000-60.000) in steps of 0.001
ú
P = (0.000-3.000) in steps of 0.001
1MRK 506 317-BUS A
Accuracy
Class 5 +40 ms
ABB