ABB VM1 Installation And Service Instructions Manual page 38

VM1 - USER MANUAL
38
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9. Installation
9.1. General
Correct installation is of prime importance. The
manufacturer's instructions must be carefully studied
and followed. It is good practice to use gloves to
handle the pieces during installation.
The areas involved by the passage of power
conductors or conductors of auxiliary circuits must be
protected against access of any animals which might
cause damage or disservices.
9.2. Trip curves
The following graphs show the number of closing-opening
cycles (No.) allowed, of the vacuum interrupters, according
to the breaking capacity (Ia).
5
10
9
8
7
6
5
4
3
2
1,5
4
10
9
8
7
6
5
4
3
2
3
10
9
8
7
N.
6
5
4
3
2
17,5-24 kV
2
10
9
8
7
6
5
4
3
2
10
9
8
7
6
5
0,05 0,1
0,2 0,3 0,5 0,7
0,4 0,6
Fig. 12a
12 kV
10 30 40
1 2 3 4 5 6 78 20
9 50
Ia
(kA)
5
10
9
8
7
6
5
4
3
2
1,5
4
10
9
8
7
6
5
N.
4
3
2
In = 630 A
3
10
9
8
7
6
5
4
3
2
2
10
9
8
7
6
V 1 M
5
4
- 12 kV , 630 A, 25 kA
3
- 12-17,5 kV , 1250 A,
2
- 17,5 kV , 630 A, 20 kA
10
9
8
7
6
5
0,05 0,1 0,5 0,7
0,2 0,3
0,4 0,6
Fig. 12b
5
10
9
8
7
6
5
4
3
2
1,5
4
10
9
8
7
6
5
4
3
2
In = 630 A
3
10
9
8
N.
7
6
5
4
3
2
2
10
9
8
7
6
5
4
3
2
V 1 M
- 12-17,5 kV , 630/1250 A, 31,5 kA
10
9
8
7
6
5
0,05 0,1
0,2 0,3 0,5 0,7
0,6
0,4
Fig. 12c
Caption
Nr. Number of closing-opening cycles allowed for the vacuum interrupters.
Ia Breaking capacity of the vacuum interrupters.
In = 1250 A
< 25 kA
1 10 20 30 40
2 3 4 5 6 78
9
50
Ia
(kA)
In = 1250 A
10 30 40
1 2 3 4 5 6 78 20
9 50
Ia
(kA)