Manual 37353A
MFR 13 Packages - Protection Relay
© Woodward
Page 51/91
Very Inverse
Ip = In; I start = 1.1 x In
0.01
0.1
1
10
100
1000
1
10
100
I/Ip
t[s]
tp = 1.0 s
tp = 0.5 s
tp = 0.2 s
tp = 0.1 s
tp = 0.05 s
tp = 1.6 s
I start/Ip
Figure 6-3: Inverse time-overcurrent - characteristic "very inverse"
Extremely Inverse
Ip = In; I start = 1.1 x In
0.01
0.1
1
10
100
1000
1
10
100
I/Ip
t[s]
tp = 1.0 s
tp = 0.5 s
tp = 0.2 s
tp = 0.1 s
tp = 0.05 s
tp = 1.6 s
I start/Ip
Figure 6-4: Inverse time-overcurrent - characteristic "extremely inverse"