ABB PR521 - Normally Inverse (NI) Time-Delay Curve; NI Curve for Overcurrent Protection

32/40 - 647008/002 - 2000/05 it-en
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0.1
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2
1.3
3456
7
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10 20 30 40
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I/I>
t [s]
IEC 255-3
Normal Inverse Curve
I>
10
1
10.2. Curva di intervento a tempo normalmente
inverso (NI) per protezione da sovracorrente
10.2.Normally inverse time-delay trip curve (NI)
for overcurrent protection
0.14
t= K x
-1
I
I>
[ ]
0.02