ISO 9001:2008
www.fanox.com
SIAC116B1011AB_Rev. 05
13 / 32
4.2.
IEEE Curves
The IEEE curves follow the following mathematical equation:
( )
+
−
=
B
V
A
TD
t
P
1
adjusted
I
I
V
=
And we have the following curves:
•
Inverse Curve
•
Very Inverse Curve
•
Extremely Inverse Curve
Which relate to the parameters figuring in the following table:
Parameters
A
P
B
Ext. Inverse
28,2
2
0,1217
Very Inverse
19,61
2
0,491
Inverse
0,0515
0,02
0,114
The curve can move from its axis using the TD time selection device, which the user can
adjust.
I
adjusted
is the initial operating current, set by the user.
