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Example for Delay type "Moderately inverse (MI)":
k
=
I
=
I
=
pickup
A
=
B
=
C
=
D
=
E
=
⎡
⎢
⎢
=
⋅
+
t
0
5 .
. 0
1735
⎢
⎛
⎜
⎢
⎝
⎣
The operation time in this example will be 0.38 seconds. The same result
can be read from Figure 3.50.
Figure 3.50 – IEEE2 Moderately
Inverse Delay
0.50
4 pu
2 pu
0.1735
0.6791
0.8
-0.08
0.127
−
. 0
6791
. 0
08
+
⎞
2
⎛
⎞
4
4
−
⎟
−
0
8 .
⎜
⎟
0
8 .
⎠
2
⎝
⎠
2
Figure 3.51 – IEEE2 Normal
3-87
Protection Functions
⎤
⎥
. 0
127
⎥
+
=
. 0
38
⎥
3
⎛
⎞
4
−
⎜
⎟
⎥
0
8 .
⎝
⎠
⎦
2
Inverse Delay
857-UM001A-EN-P – July 2009
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