Page 5-11
FPU-32 Feeder Protection Unit
Rev.
2-A-103014
Protective Functions
CURRENT IN MULTIPLES OF PICKUP SETTING (I
M
)
TIME IN SECONDS (t)
IEEE EXTREMELY INVERSE
1
2
3
4
5
6
7
8
9 10
20
0.02
0.03
0.05
0.07
0.1
0.2
0.3
0.5
0.7
1
2
3
5
7
10
20
30
50
70
100
200
300
500
1.0
0.7
0.5
0.3
0.2
0.1
0.05
I
M
> 1.1: t = T
M
x 3 x (28.2/(I
M
2
- 1) + 0.1217)
I
M
> 20: t = t
I
M
=20
I
M
< 0.9: t
reset
= T
M
x 3 x 29.1/(1 - I
M
2
)
Time
Multiplier
(T
M
)
FIGURE 5.9 IEEE Extreme Inverse Curves.
