FANOX SIL-D00, User Manual, Page: 53 / 226

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4.16. IEEE Curves
The IEEE curves follow the following mathematical equation:
 














 
B
V
A
TD t
P
1
Where:
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.