Table 404:
ANSI Inverse time characteristics
Function
Range or value
Accuracy
Operating characteristic:
(
)
=
+
×
-
æ
ö
ç
÷
ç
÷
è
ø
1
P
A
t
B
td
I
EQUATION1651 V1 EN
I = I
measured
/I
set
td = (0.05-999) in steps of 0.01
-
ANSI Extremely Inverse
A=28.2, B=0.1217, P=2.0
ANSI Very inverse
A=19.61, B=0.491, P=2.0
ANSI Normal Inverse
A=0.0086, B=0.0185, P=0.02,
tr=0.46
ANSI Moderately Inverse
A=0.0515, B=0.1140, P=0.02
ANSI Long Time Extremely Inverse
A=64.07, B=0.250, P=2.0
ANSI Long Time Very Inverse
A=28.55, B=0.712, P=2.0
ANSI Long Time Inverse
A=0.086, B=0.185, P=0.02
Table 405:
IEC Inverse time characteristics
Function
Range or value
Accuracy
Operating characteristic:
(
)
=
×
-
æ
ö
ç
÷
ç
÷
è
ø
1
P
A
t
td
I
EQUATION1653 V1 EN
I = I
measured
/I
set
td = (0.05-999) in steps of 0.01
-
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
Section 19
1MRK 505 277-UUS C
Time inverse characteristics
466
Technical Manual
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