Permissible Number Of Vacuum - ABB VD4 Instruction Manual

2.4 Permissible number of vacuum interrupter switching operations in relation to breaking current
See figure 2/1.
5
10
8
6
4
3
2
4
10
8 8
6
4
3
2
3
10
8 8
6
4
3
2
2
10
8
6
4
3
2
10
8
6
5
0.05 0.1 0.2 0.3 0.4 0.6 0.8 1
Breaking current I (kA)
a) Circuit-breaker type VD4, 36 kV and 40.5 kV
Rated short-circuit breaking current 25 kA
8
Rated
current
1250 A
1600 A
2000 A
2500 A
2 3 4 6 8 10 20 30 40 60
a
Figure 2/1: Permissible number of vacuum interrupter operating
cycles n as a function of the breaking current I
5
10
8
6
4
3
2
4
10
8 8
6
4
3
2
3
10
8 8
6
4
3
2
2
10
8
6
4
3
2
10
8
6
5
0.05 0.1 0.2 0.3 0.4 0.6 0.8 1
Breaking current I (kA)
b) Circuit-breaker type VD4, 36 kV and 40.5 kV
Rated short-circuit breaking current 31.5 kA
a
Rated
current
1250 A
1600 A
2000 A
2500 A
2 3 4 6 8 10 20 30 40 60
a