ABB Relion 670 series, Technical Reference Manual

Page: 1198 / 1232

Table 732: Inverse time characteristics for undervoltage protection
Function Range or value Accuracy
Type A curve:
=
-
æ ö
ç ÷
è ø
td
t
VPickup V
VPickup
EQUATION1658 V1 EN
V = V
measured
td = (0.05-1.10) in steps
of 0.01
5% +40 ms
Type B curve:
×
= +
-
× -
æ ö
ç ÷
è ø
2.0
480
0.055
32 0.5
td
t
VPickup V
VPickup
EQUATION1659 V1 EN
V = V
measured
td = (0.05-1.10) in steps
of 0.01
Programmable curve:
×
= +
-
× -
é ù
ê ú
ê ú
ê ú
æ ö
ê ú
ç ÷
ëè ø û
P
td A
t D
VPickup V
B C
VPickup
EQUATION1660 V1 EN
V = V
measured
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
Section 22
1MRK505222-UUS C
Inverse time characteristics
1192
Technical reference manual