Table 696:
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-US
V = V
measured
td = (0.05-1.10) in steps
of 0.01
±5.0% or ±45 ms
whichever is greater
Type B curve:
×
=
+
-
×
-
æ
ö
ç
÷
è
ø
2.0
480
0.055
32
0.5
td
t
VPickup V
VPickup
EQUATION1659 V1 EN-US
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-US
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
1MRK 511 408-UUS A
Section 26
Inverse time characteristics
Phasor measurement unit RES670 2.2 ANSI
895
Technical manual
Summary of Contents for Relion RES670
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