Extremely Inverse Time-Delay Trip Curve (Ei) For Over-Current Protection - ABB PR521 Operator's Manual

10.4. Curva di intervento a tempo estremamente
inverso (EI) per protezione da sovracorrente
t [s]
100
10
1
0.1
0.01
34/40 - 647008/002 - 2000/05 it-en
2 3 4 5
1.3
t= K x
10.4. Extremely inverse time-delay trip curve
(EI) for over-current protection
IEC 255-3 IEC 255-3
Extremely Inverse Curve Extremely Inverse Curve
K = 1.6 K = 1.6
K = 0.1 K = 0.1
6 8 10 20
7 9
80
2
[ ]
I
-1
I>
I > I >
30 40 60
I/I>
50