2.13 Inverse time operation
2 Protection functions
Technical description
88
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Example for Delay type "Moderately inverse (MI)":
k
= 0.50
I
= 4 pu
I
pickup
= 2 pu
A
= 0.0515
B
= 0.114
C
= 0.02
9
.
1
1140
.
0
1
2
4
0515
.
0
50
.
0
02
.
0
t
The operation time in this example will be 1.9 seconds. The
same result can be read from Figure 2.13.1-8.
Figure 2.13.1-5 ANSI/IEEE long
time inverse delay
Figure 2.13.1-6 ANSI/IEEE long
time very inverse delay
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