MEDIUM VOLTAGE SWITCHGEAR HAVING DISCONNECTING SWITCHES AND THREE-POSITION SWITCHES

INSTALLATION DE COMMUTATION POUR MOYENNE TENSION AVEC DES SECTIONNEURS ET DES COMMUTATEURS A TROIS POSITIONS

English Abstract

The invention relates to a medium voltage switchgear having disconnecting switches and three-position switches, according to the preamble of claim 1. In order to more easily make different implementations of the current-carrying capacity, according to the invention, the attainable current-carrying capacity is increased with respect to a base current-carrying capacity by means of the multiple arrangement of identical contact systems (1) per phase (L1, L2, L3) in a parallel arrangement on a common switch axis (2).

French Abstract

L'invention concerne une installation de commutation pour moyenne tension avec des sectionneurs et des commutateurs à trois positions, selon le préambule de la revendication 1. Afin de pouvoir réaliser de manière plus simple plusieurs mises en uvre de la capacité de transport de courant, il est prévu selon l'invention d'agencer plusieurs mêmes systèmes de contact (1) par phase (L1, L2, L3) placés en parallèle sur un axe de commutation (2) commun afin d'augmenter la capacité de transport de courant par rapport à une capacité de transport de base.

Claims

-5-
Claims
1. A medium-voltage switchgear assembly having
disconnecting switches and three-position switches,
characterized
in that, by virtue of a multiple arrangement of
identical contact systems (1) per phase (L1, L2, L3) in
a parallel arrangement on a common switching shaft (2),
the current-carrying capacity which can be achieved is
increased in comparison with a basic current-carrying
capacity.
2. The medium-voltage switchgear assembly as claimed
in claim 1,
characterized
in that the basic current-carrying capacity is
1,250 amperes, and the contacts of the disconnectors
and/or three-position switches are designed for this
current-carrying capacity.
3. The medium-voltage switchgear assembly as claimed
in claim 2,
characterized
in that the current-carrying capacity of 2,500 amperes
is provided by arranging two contact arrangements
positioned parallel to one another on a switching
shaft, each of said contact arrangements being designed
for a basic current-carrying capacity of 1,250 amperes.
4. The medium-voltage switchgear assembly as claimed
in claim 2 or 3,
characterized
in that the switching shaft consists of plastic.
5. The medium-voltage switchgear assembly as claimed
in claim 2 or 3,
characterized

-6-
in that the switching shaft consists of a ceramic
material.
6. The medium-voltage switchgear assembly as claimed
in claim 5,
characterized
in that a mechanical anti-rotation or anti-torsion
element is integrated in the switching shaft, whereby
the switching shaft itself is mechanically rotationally
rigid.
7. The medium-voltage switchgear assembly as claimed
in one of claims 1 to 3,
characterized
in that the switching shaft consists of metal, and the
switching levers of the disconnecting switches or
three-position switches consist of plastic.

Description

CA 02777491 2012-04-12
WO 2011/045046 PCT/EP2010/006263
MEDIUM VOLTAGE SWITCHGEAR HAVING DISCONNECTING SWITCHES
AND THREE-POSITION SWITCHES
The invention relates to a medium-voltage switchgear
assembly with disconnecting switches and three-position
switches in accordance with the preamble of patent
claim 1.
Disconnecting switches and three-position switches are
designed for two typical current-carrying capacities in
medium-voltage switchgear assemblies. A common
standard-compliant value in accordance with IEC is
1,250 amperes and a further value is 2,500 amperes. For
the different current-carrying capacities, therefore,
different components of said switches are also
required.
This different configuration has disadvantages in terms
of manufacturing technology.
The invention is therefore based on the object of
developing a medium-voltage switchgear assembly of the
generic type such that different realizations of the
current-carrying capacity can be achieved more easily.
The stated object is achieved in a medium-voltage
switchgear assembly of the generic type according to
the invention by the characterizing features of patent
claim 1.
Further advantageous configurations are specified in
the dependent claims.
The essence of the invention consists in that, by
virtue of a multiple arrangement of identical contact
systems (1) per phase (L1, L2, L3) in a parallel
arrangement on a common switching shaft (2), the
current-carrying capacity which can be achieved is

CA 02777491 2012-04-12
WO 2011/045046 - 2 - PCT/EP2010/006263
increased in comparison with a basic current-carrying
capacity.
It is therefore now possible for the contact components
to all be manufactured uniformly, and only the number
of contact systems or switches arranged in parallel and
per phase therefore structurally increases the
respectively desired current-carrying capacity.
In an advantageous configuration in this regard, the
basic current-carrying capacity is 1,250 amperes, and
the contacts of the disconnectors and/or three-position
switches are designed for this current-carrying
capacity.
In a further advantageous configuration, the current-
carrying capacity of 2,500 amperes is provided by
arranging two contact arrangements positioned in
parallel with one another on a switching shaft, each of
said contact arrangements being designed for a basic
current-carrying capacity of 1,250 amperes.
In a further advantageous configuration, the switching
shaft consists of plastic. As a result, simple
isolation of the contact arrangements with respect to
one another is provided, and the contacts of all three
AC phases can thus be positioned on one switching
shaft.
As an alternative to this the switching shaft can also
consist of a ceramic material.
In order to ensure a high mechanical rotational
rigidity, the configuration is advantageously such that
a mechanical anti-rotation or anti-torsion element is
integrated in the switching shaft, whereby the
switching shaft itself is mechanically rotationally
rigid.

CA 02777491 2012-04-12
WO 2011/045046 - 3 - PCT/EP2010/006263
A further advantageous design alternative is
characterized by the fact that the switching shaft
consists of metal, and the switching levers of the
disconnecting switches or three-position switches
consist of plastic.
The invention is illustrated in the drawing and
described in more detail below.
Figure 2 shows an arrangement of three contact
components or arrangements 1 on a switching shaft, with
this being for in each case all three AC phases L1, L2
and L3. Here, in each case one contact arrangement per
AC phase is provided.
Figure 1 shows that in each case two parallel contact
arrangements 1 for each phase are arranged on the shaft
or switching shaft 2. For understanding of the
function, mention will once again be made of the fact
that this shaft moves the levers which, for their part,
again themselves move the contacts. In the illustration
in figure 2, each contact arrangement, i.e. per phase,
is designed to have a current-carrying capacity of
1,250 amperes. Owing to the double arrangement in
figure 1, a total current-carrying capacity of 2,500
amperes is thus achieved.
By virtue of a simple multiple arrangement of contact
arrangements per phase, an integral multiple of a basic
current-carrying capacity can thus be achieved, for
example. However, structurally different contact
arrangements can also be used which result in
combinable individual current-carrying capacities with
one another to give any desired total current-carrying
capacities per phase.

CA 02777491 2012-04-12
WO 2011/045046 - 4 - PCT/EP2010/006263
Thus, 1,250 ampere switchgear assemblies with the same
prefabricated contact arrangements as, for example,
2,500 ampere switchgear assemblies can be established.
This is performed simply by doubling the contact
arrangements per phase, with this being on one and the
same switching shaft.

Representative Drawing