Very Inverse Time-Delay Trip Curve (Vi) For Overcurrent Protection - ABB PR521 Operator's Manual

10.3.Curva di intervento a tempo molto inverso (VI)
per protezione da sovracorrente
t [s]
100
10
1
0.1
0.01
1.3 2 3 4 5
t = K x
10.3.Very inverse time-delay trip curve (VI) for
over-current protection
IEC 255-3
Very Inverse Curve
K = 1.6 K = 1.6
K = 0.1 K = 0.1
6 8 10 20
7 9
13.5
[ ] I
-1
I>
I >
30 40 60
I/I>
50
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