Inverse characteristic
Table 98. ANSI Inverse time characteristics
Function
Range or value
Accuracy
Operating characteristic:
(
)
1
=
+
×
-
æ
ö
ç
÷
ç
÷
è
ø
P
A
t
B
k
I
EQUATION1249-SMALL V1 EN
Reset characteristic:
( )
2
1
=
×
-
tr
t
k
I
EQUATION1250-SMALL V1 EN
I = I
measured
/I
set
k = (0.05-999) in steps of 0.01
-
ANSI Extremely Inverse
A=28.2, B=0.1217, P=2.0 , tr=29.1
ANSI/IEEE C37.112, 5%
+ 40 ms
ANSI Very inverse
A=19.61, B=0.491, P=2.0 , tr=21.6
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, tr=4.85
ANSI Long Time Extremely Inverse
A=64.07, B=0.250, P=2.0, tr=30
ANSI Long Time Very Inverse
A=28.55, B=0.712, P=2.0, tr=13.46
ANSI Long Time Inverse
A=0.086, B=0.185, P=0.02, tr=4.6
Bay control REC670
1MRK511232-BEN E
Pre-configured
Product version: 1.2
70
ABB