Iskra FPC 200 - Page 18

Functionality
18 USER MANUAL FPC 200 - 3/2017
2.1.3.4 Graphs of inverse characteristics
Graphs below represent time to trip depending on current and user defined IDMT setting for each of the inverse time
characteristics.
Figure 8 IEC Normal inverse characteristics.
Figure 9 IEC Very inverse characteristics.
Figure 10IEC Extremely inverse characteristics.
Figure 11 IEC Long time inverse characteristics.
1.1 2 3 4 5 6 7 8 9 10
1
10
100
1000
1500
IEC Normal inverse
I / In
t [s]
0.05
IDMT
0.1
IDMT
0.2
IDMT
0.3
IDMT
0.4
IDMT
0.6
IDMT
0.8
IDMT
1
IDMT
1.1 2 3 4 5 6 7 8 9 10
0.1
1
10
100
1000
1500
IEC Very inverse
I / In
t [s]
0.05
IDMT
0.1
IDMT
0.2
IDMT
0.3
IDMT
0.4
IDMT
0.6
IDMT
0.8
IDMT
1
IDMT
1.1 2 3 4 5 6 7 8 9 10
0.1
1
10
100
1000
1500
IEC Extremely inverse
I / In
t [s]
0.05
IDMT
0.1
IDMT
0.2
IDMT
0.3
IDMT
0.4
IDMT
0.6
IDMT
0.8
IDMT
1
IDMT
1.1 2 3 4 5 6 7 8 9 10
1
10
100
1000
1500
IEC Long time inverse
I / In
t [s]
0.05
IDMT
0.1
IDMT
0.2
IDMT
0.3
IDMT
0.4
IDMT
0.6
IDMT
0.8
IDMT
1
IDMT