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SIAFxxxxxxxxxxx_Rev. 01
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5.1 IEC60255-151 Curves
The SIA-C relay complies with the curves shown in standard IEC60255-151:
•
Inverse Curve.
•
Very Inverse Curve.
•
Extremely Inverse Curve.
•
Long-time inverse.
There is a general mathematical equation that defines the time in seconds as a function of the
current:
K
D
B
Q
V
D
A
t
P
+
+
−
=
adjusted
I
I
V
=
Parameters
A
P
Q
B
K
Long Time Inverse
120
1
1
0
0
Ext. Inverse
80
2
1
0
0
Very Inverse
13,5
1
1
0
0
Inverse
0,14
0,02
1
0
0
The curve can mode from its axis using the D time selection device, which the user can adjust.
I
adjusted
is the initial operating current, set by the user.
