Trip relays Characteristic curves
Instantaneous (I) Ground fault (G)
100
50 40 30 20 Ig = 0.2...1 In 10
5 4 3 2
t(s)
1 I2t ON
0.4
0.4
0.3
0.3
0.2
0.2
0.2
0.1
I2t OFF 0.1
0.1
0.4 0.3
0.05
0.05 Ii = 2...15 In
44
Ă— In
3
2
10
7
4 5
3
2
1
0.7
0.4 0.5
0.3
0.2
0.1
0.07
0.01
0.05
0.02