Table 960:
IEC Inverse time characteristics
Function
Range or value
Accuracy
Operating characteristic:
(
)
1
=
×
-
æ
ö
ç
÷
ç
÷
è
ø
P
A
t
k
I
EQUATION1251-SMALL V1 EN
I = I
measured
/I
set
k = (0.05-2.00) in steps of 0.01 IEC 60255-151, ± 2.0%
or ± 40 ms whichever is
greater
IEC Normal Inverse
A=0.14, P=0.02
IEC Very inverse
A=13.5, P=1.0
IEC Inverse
A=0.14, P=0.02
IEC Extremely inverse
A=80.0, P=2.0
IEC Short time inverse
A=0.05, P=0.04
IEC Long time inverse
A=120, P=1.0
Programmable characteristic
Operate characteristic:
(
)
=
+
×
-
æ
ö
ç
÷
ç
÷
è
ø
P
A
t
B
k
I
C
EQUATION1370-SMALL V1 EN
Reset characteristic:
(
)
=
×
-
PR
TR
t
k
I
CR
EQUATION1253-SMALL V1 EN
I = I
measured
/I
set
k = (0.05-999) in steps of 0.01
A=(0.005-200.000) in steps of
0.001
B=(0.00-20.00) in steps of 0.01
C=(0.1-10.0) in steps of 0.1
P=(0.005-3.000) in steps of
0.001
TR=(0.005-100.000) in steps
of 0.001
CR=(0.1-10.0) in steps of 0.1
PR=(0.005-3.000) in steps of
0.001
Table 961:
RI and RD type inverse time characteristics
Function
Range or value
Accuracy
RI type inverse characteristic
1
0.236
0.339
=
×
-
t
k
I
EQUATION1137-SMALL V1 EN
I = I
measured
/I
set
k = (0.05-2.00) in steps of 0.01 IEC 60255-151, ± 2.0%
or ± 40 ms whichever is
greater
RD type logarithmic inverse characteristic
5.8
1.35
=
-
×
æ
ö
ç
÷
è
ø
t
I
In
k
EQUATION1138-SMALL V1 EN
I = I
measured
/I
set
k = (0.05-999) in steps of 0.01
Section 25
1MRK502052-UEN B
Inverse time characteristics
1254
Technical manual
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