ABB PR521 - Extremely Inverse (EI) Time-Delay Curve; EI Curve for Over-Current Protection

34/40 - 647008/002 - 2000/05 it-en
10.4. Curva di intervento a tempo estremamente
inverso (EI) per protezione da sovracorrente
10.4. Extremely inverse time-delay trip curve
(EI) for over-current protection
100
10
1
0.1
0.01
2
1.3
3456
7
8
9
10 20 30 40
50
60
I/I>
t [s]
IEC 255-3
Extremely Inverse Curve
IEC 255-3
Extremely
Inverse Curve
I
>
I
>
K = 0.1K = 0.1
K = 1.6K = 1.6
80
t= K x
-1
I
I>
[ ]
2