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Table 683:
Inverse time characteristics for undervoltage protection
Function
Range or value
Accuracy
Type A curve:
=
< -
<
æ
ö
ç
÷
è
ø
k
t
U
U
U
EQUATION1431-SMALL V1 EN-US
U< = U
set
U = U
measured
k = (0.05-1.10) in
steps of 0.01
±5.0% or ±45 ms
whichever is greater
Type B curve:
2.0
480
0.055
32
0.5
×
=
+
< -
×
-
<
æ
ö
ç
÷
è
ø
k
t
U
U
U
EQUATION1432-SMALL V1 EN-US
U< = U
set
U = U
measured
k = (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
k A
t
D
U
U
B
C
U
EQUATION1433-SMALL V1 EN-US
U< = U
set
U = U
measured
k = (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 506 382-UEN A
Section 23
Inverse time characteristics
Line distance protection REL650 2.2 IEC
903
Technical manual
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