EP3189534B1 - Switching arrangement for a control transformer, particularly a pre-selector - Google Patents

Description

The present invention relates to a switching arrangement for a regulating transformer for selectively connecting a first winding and a second winding of the regulating transformer and in particular a preselector.

Preselector, which can be designed as a reverser, coarse or Mehrfachgrobwähler generally serve in an on-load tap changer for a control transformer with main winding and control winding to expand the control range of the control transformer, also called tapped transformer. Turners make it possible to connect the control windings to the main winding either in the same direction or in opposite directions to the main winding. Rough selectors make it possible to connect a larger part of the main winding, a so-called coarse step winding or coarse step, optionally with the control winding or not, so to bridge the coarse stage winding.

Both the step winding of a control transformer and the coarse step are briefly separated galvanically from the main winding during their switchover by turning or coarse selector. They assume an electrical potential which results from the voltages of the neighboring windings as well as the coupling capacitances to these windings and to grounded parts. The resulting differential voltages are sometimes considerable; they claim the switching path of the opening preselector contacts and can lead to unacceptable discharges at the appropriate height. Such discharges, also called arcs, cause gas formation in the insulating oil of the on-load tap-changer. This is undesirable, especially as the system voltage increases, the amount of unwanted gases increases.

DE 10 2009 025 358 A1 describes a tap changer with a selection for uninterrupted switching between different winding taps of a control winding of a tapped transformer. The preselector comprises two fixed preselector contacts and may be designed as a turner or coarse selector. One fixed preselector contact is electrically connected to the beginning of the control winding and the other fixed preselector contact is electrically connected to the end of the control winding. A movable contact is provided whose root terminal is electrically connected to the main winding of the tapped transformer and which selectively connects one of the fixed preselector contacts. The mobile one Contact is formed longitudinally displaceable and has a hermetically sealed against the environment switching chamber in which, also longitudinally displaceable, contact pieces are. The contacts are closed when switching to one of the fixed preselector contacts against the force of a spring, but opened during the switching between the fixed preselector contacts. A disadvantage of this known tap changer is that the arrangement, drive and storage of the switching chamber have a large design effort and require a lot of space.

It is an object of the invention to provide a switching arrangement for a control transformer, which allows a simple construction with little space.

This object is solved by the subject matter of independent claim 1. Advantageous developments and embodiments of the invention are described in the dependent claims.

In the following, a formulation of the type "A is connected to B" includes the meanings "A is directly electrically conductively connected to B" and "A is indirectly, ie via C, electrically conductively connected to B", and has a formulation of the type " A is connected to B "meaning" A is electrically connected directly to B ".

• eine erste Anschlussklemme, die mit der ersten Wicklung verbunden werden kann;
• eine zweite Anschlussklemme, die mit dem ersten Abgriff verbunden werden kann;
• eine dritte Anschlussklemme die mit dem zweiten Abgriff verbunden werden kann;
• einen ersten, zweiten, dritten und vierten Festkontakt;
• eine Vakuumschaltröhre;
• einen ersten Bewegtkontakt, der wahlweise mit dem ersten oder zweiten Festkontakt kontaktierbar ist;
• einen zweiten Bewegtkontakt, der wahlweise mit dem dritten oder vierten Festkontakt kontaktierbar ist;

wobei

• der zweite und der vierte Festkontakt mit der zweiten Anschlussklemme verbunden sind;
• der erste und der dritte Festkontakt mit der dritten Anschlussklemme verbunden sind;
• der erste Bewegtkontakt über die Vakuumschaltröhre mit der ersten Anschlussklemme verbunden ist;
• der zweite Bewegtkontakt mit der ersten Anschlussklemme verbunden ist.

The invention proposes a switching arrangement for a variable transformer comprising a first winding and a second winding having a first and a second tap, comprising

• a first terminal that can be connected to the first winding;
• a second terminal that can be connected to the first tap;
• a third terminal that can be connected to the second tap;
• a first, second, third and fourth fixed contact;
• a vacuum interrupter tube;
• a first moving contact selectively contactable with the first or second fixed contact;
• a second moving contact selectively contactable with the third or fourth fixed contact;

in which

• the second and fourth fixed contacts are connected to the second terminal;
• the first and third fixed contacts are connected to the third terminal;
• the first moving contact is connected to the first terminal via the vacuum interrupter;
• the second moving contact is connected to the first terminal.

The proposed switching arrangement allows by using a vacuum interrupter in conjunction with moving contacts and fixed contacts a particularly simple and compact design. By separating the vacuum interrupter from the moving contacts and fixed contacts, it is possible to arrange them independently of each other and thus make the best use of the available space. The vacuum interrupter additionally prevents the formation of gases in the insulating oil. The open vacuum interrupter increases the dielectric strength and prevents arcing between the moving contacts and fixed contacts.

The proposed switching arrangement may be formed as desired in any manner and include, for example, at least one or no additional vacuum interrupter.

According to the invention the vacuum interrupter is stationary or stationary, relative to the moving contacts, mounted so that the structure of the switching arrangement can be designed as particularly compact. For the operation of the vacuum interrupter this must not be moved.

Preferably, it is provided in an example, three-phase design of the control transformer that three of the proposed switching arrangements are arranged one above the other, wherein the moving contacts and the vacuum interrupters of all switching arrangements are actuated via a common switching tube.

Preferably, the first moving contact, the first fixed contact and the second fixed contact are in a dielectric medium or air or SF6 or insulating oil and / or are formed by a mechanical changeover switch, which in particular does not include a vacuum interrupter and a semiconductor switch.

Preferably, the second moving contact, the third fixed contact and the fourth fixed contact are in a dielectric medium or air or SF6 or insulating oil and / or are formed by a mechanical changeover switch, which in particular does not include a vacuum interrupter and a semiconductor switch.

• die Vakuumschaltröhre zwischen einem oberen Halter und einem unteren Halter an mindestens einem Kontaktstab stationär angebracht ist.

It can be provided that

• the vacuum interrupter between an upper holder and a lower holder at least one contact rod is mounted stationary.

• im oberen Halter ein Kipphebel zum Öffnen und zum Schließen der Vakuumschaltröhre gelagert ist.

It can be provided that

• in the upper holder a rocker arm for opening and closing the vacuum interrupter is mounted.

• die Bewegtkontakte an einem Schaltrohr parallel übereinander angebracht sind;
• das Schaltrohr drehbar gelagert ist;
• die Bewegtkontakte durch die Drehung des Schaltrohres eine Schwenkbewegung ausführen.

It can be provided that

• the moving contacts are mounted on a switching tube parallel to each other;
• the switching tube is rotatably mounted;
• the moving contacts perform a pivoting movement by the rotation of the switching tube.

• eine Kurvenscheibe am Schaltrohr angebracht ist;
• die Kurvenscheibe durch Drehung des Schaltrohrs eine Schwenkbewegung ausführt;
• die Kurvenscheibe mit dem Kipphebel im ober Halter mechanisch zusammenwirkt und die Vakuumschaltröhre öffnet oder schließt.

It can be provided that

• a cam is attached to the switching tube;
• the cam performs a pivotal movement by rotation of the switching tube;
• the cam interacts mechanically with the rocker arm in the upper holder and the vacuum interrupter opens or closes.

• jeder Bewegtkontakt ein Gehäuse mit Kontaktfingern aufweist, die an einem ersten Ende mechanisch gleitend und elektrisch leitend mit einem dem jeweiligen Bewegtkontakt zugeordneten Ableitring verbunden sind und an einem zweiten Ende wahlweise mit dem jeweiligen Festkontakt verbunden werden können.

It can be provided that

• each moving contact has a housing with contact fingers which are mechanically slidably and electrically conductively connected at a first end to a diverting ring associated with the respective moving contact and can optionally be connected to the respective fixed contact at a second end.

• der erste Abgriff und der zweite Abgriff an jeweils einem Ende der zweiten Wicklung angeordnet sind.

It can be provided that

• the first tap and the second tap are disposed at one end of the second coil, respectively.

• eine vierte Anschlussklemme, die mit einem dritten Abgriff der zweiten Wicklung zwischen dem ersten Abgriff und dem zweiten Abgriff verbunden werden kann;
• einen Widerstand, der mit der vierten Anschlussklemme verbunden ist.

It can be provided that the switching arrangement comprises

• a fourth terminal connectable to a third tap of the second winding between the first tap and the second tap;
• a resistor connected to the fourth terminal.

The fourth connection terminal may be or may be connected, for example, via the resistor to ground or to ground potential or to a derivative of the regulation transformer. The derivative, for its part, may or may not be connected to ground or ground, for example.

• einen Freischalter, der seriell zu dem Widerstand mit der vierten Anschlussklemme verbunden ist, und/oder eine Vakuumschaltröhre, die seriell zu dem Widerstand mit der vierten Anschlussklemme verbunden ist.

It can be provided that the switching arrangement comprises

• a circuit breaker connected in series with the resistor to the fourth terminal, and / or a vacuum interrupter connected in series with the resistor to the fourth terminal.

It can be provided that the switching arrangement is designed as a preselector and in particular as a turner or coarse selector.

Embodiments of the invention will now be described by way of example with reference to the accompanying drawings. However, the individual features resulting therefrom are not limited to the individual embodiments, but can be connected and / or combined with individual features described above and / or with individual features of other embodiments. The details in the drawings are to be interpreted as illustrative, but not restrictive. The reference signs contained in the claims are not intended to limit the scope of the invention in any way, but merely refer to the embodiments shown in the drawings.

FIG. 1

einen Regeltransformator mit einem Laststufenschalter, der einen Lastumschalter und einen Wähler sowie eine erfindungsgemäße Schaltanordnung umfasst;

FIG. 2a-g

ein Schaltbild einer ersten Ausführungsform der Schaltanordnung sowie einen Schaltablauf der Schaltanordnung;

FIG. 3

eine Perspektivansicht einer bevorzugten Ausführungsform der Schaltanordnung der FIG. 2a-g als konstruktive Ausgestaltung für eine Phase;

FIG. 4

eine andere Perspektivansicht der Schaltanordnung der FIG. 3;

FIG. 5a-d

Schaltbilder einer zweiten, dritten, vierten und fünften Ausführungsform der Schaltanordnung;

FIG. 6

ein Schaltbild einer sechsten Ausführungsform der Schaltanordnung;

FIG. 7

ein Schaltbild einer siebenten Ausführungsform der Schaltanordnung.

The drawings show in

FIG. 1

a control transformer with an on-load tap changer comprising a diverter switch and a selector and a switching arrangement according to the invention;

FIG. 2a-g

a circuit diagram of a first embodiment of the switching arrangement and a switching sequence of the switching arrangement;

FIG. 3

a perspective view of a preferred embodiment of the switching arrangement of FIG. 2a-g as a structural design for a phase;

FIG. 4

another perspective view of the switching arrangement of FIG. 3 ;

FIG. 5a-d

Circuit diagrams of a second, third, fourth and fifth embodiment of the switching arrangement;

FIG. 6

a circuit diagram of a sixth embodiment of the switching arrangement;

FIG. 7

a circuit diagram of a seventh embodiment of the switching arrangement.

In FIG. 1 an exemplary embodiment of a control transformer 4 is schematic 1, which comprises a high-voltage or primary side with a first and second winding 2, 3, an undervoltage or secondary side 40 and an on-load switch 46 with a diverter switch 45, a selector 47 and a switching arrangement 1 according to the invention. The control transformer 4 is surrounded by a transformer housing 42. With the arranged inside the transformer housing 42 on-load tap-changer 46, the various taps 13 (see FIG. 2 ) of the control transformer 4 are connected. In order to ensure a proper operation of the control transformer 4, the on-load tap-changer 46 must perform the required switching sequence without interference. The on-load tap-changer 46 projects into the transformer housing 42, which may be filled with oil depending on the type of regulating transformer 4. The on-load tap-changer 46 here comprises, for example, diverter switch 45 and selector 47, but may also be designed as a load selector.

The on-load tap-changer 46 is actuated by means of a motor drive 48, which is fastened to an outer wall 43 of the transformer housing 42, via a linkage. However, the motor drive 48 may also be directly on the lid 41, so at the top of the on-load tap-changer 46, mounted.

The regulating transformer 4 usually comprises at least one first winding 2 and one second winding 3 for each phase, which can be electrically connected to one another by the switching arrangement 1, which can be designed as a turn or coarse selector, as described below FIG. 2 is described in detail.

In FIG. 2a a circuit diagram of a first embodiment of the switching arrangement 1 for an on-load tap-changer 46 is shown schematically. The switching arrangement 1 comprises three connection terminals 2.1, 3.1, 3.2, wherein the first connection terminal 2.1 with the first winding 2, the second terminal 3.1 with a first tap 3.3 of the second winding 3 and the third terminal 3.3 with a second tap 3.4 of the second winding. 3 are connected. The first and second taps 3.3, 3.4 are each connected to the ends of the second winding 3.

In this embodiment, the first winding 2 as a parent winding and the second winding 3 is formed as a control winding and the switching device 1 fulfills the function of a Wenders.

Furthermore, the switching arrangement 1 comprises four fixed contacts 5.1, 5.2, 5.3, 5.4, a stationary vacuum interrupter 6 and two moving contacts 7, 8. The second and fourth fixed contact 5.2, 5.4 are electrically conductively connected to the second terminal 3.1. The first and third fixed contact 5.1, 5.3 are electrically connected to the third terminal 3.2.

The first moving contact 7 is electrically connected via the vacuum interrupter 6 to the first terminal 2.1. The second moving contact 8 is electrically connected directly to the first terminal 2.1. The first moving contact 7 can optionally be connected or contacted with the first or second fixed contact 5.1, 5.2. The second moving contact 8 can optionally be connected or contacted with the third or fourth fixed contact 5.3, 5.4.

When in the FIG. 2a illustrated position of the switching device 1, the first winding 2 on the one hand via the vacuum interrupter 6, the first moving contact 7 and the first fixed contact 5.1 and on the other parallel electrically connected via the second moving contact 8 and the third fixed contact 5.3 with the second terminal 3.2.

FIG. 2 B shows the first step of switching the switching device 1 of FIG. 2a , Initially, the second moving contact 8 is released from the third fixed contact 5.3, so that the first winding 2 is only connected via the vacuum interrupter 6, the first moving contact 7 and the first fixed contact 5.1 with the second terminal 3.2 of the second winding 3.

FIG. 2c shows the second step in which the vacuum interrupter 6 is opened so that there is no electrically conductive connection between the first and second windings 2, 3.

FIG. 2d shows the third step, in which the first moving contact 7 is released from the first fixed contact 5.1.

FIG. 2e shows the fourth step, in which the first moving contact 7 is switched to the second fixed contact 5.3.

FIG. 2f shows the fifth step, in which the vacuum interrupter 6 is closed, so that the first winding 2 via the vacuum interrupter 6, the first moving contact 7 and the second fixed contact 5.2 is electrically connected to the first terminal 3.1.

FIG. 2g shows the sixth step, in which the second moving contact 8 is switched to the fourth fixed contact 5.4, so that the first winding 2 on the one hand via the vacuum interrupter 6, the first moving contact 7 and the second fixed contact 5.2 and the other parallel thereto via the second moving contact 8 and the fourth fixed contact 5.4 is electrically connected to the first terminal 3.1.

Switching in the opposite direction is analogous in reverse order.

In FIG. 3 and 4 is a preferred embodiment of the switching arrangement 1 of FIG. 2ag as a structural design for a phase shown schematically.

In this embodiment, the switching arrangement 1 has a plurality of arranged in a circle vertical contact bars 20 which are arranged around a vertical switching tube 21. The vacuum interrupter 6 is parallel to the contact bars 20, that is mounted vertically or stationary between an upper holder 22 and a lower holder 23. Both holders 22, 23 are attached to at least one contact rod 20.

On the switching tube 21, a first diverter ring 24 and a second diverter ring 25 are mounted. Both Ableitringe 24, 25 are mounted so that a relative movement between them and the switching tube 21 is possible. The diverting rings 24, 25 are permanently installed and the switching tube 21 can be rotated about its own axis between two positions.

The second diverter ring 25 is electrically conductively connected via a line 26 to the vacuum interrupter 6. The line 26 fixes the second diverter ring 25. The first moving contact 7 is fastened to the switching tube 21 and establishes an electrically conductive connection between the second diverter ring 25 and optionally the first fixed contact 5.1 or the second fixed contact 5.2 by rotation of the switching tube 21.

The first diverter ring 24 is connected via a line 27 directly to the first terminal 2.1 electrically conductive. The line 27 fixes the first diverter ring 24. Also, the second moving contact 8 is attached to the switching tube 21 and provides by rotation of the switching tube 21 an electrically conductive connection between the first diverter ring 24 and optionally the third fixed contact 5.3 or the fourth fixed contact 5.4 ago.

During the rotation of the switching tube 21 both Ableitringe 24, 25 remain in a fixed position and do not rotate with the switching tube 21 with.

The first and second moving contacts 7, 8 are preferably mounted parallel to each other horizontally on the switching tube 21. When performing a circuit, the moving contacts 7, 8 perform a pivoting movement and thereby connect the four fixed contacts 5.1-5.4. In this case, the second and the fourth fixed contact 5.2, 5.4 are mounted on a contact rod 20 one above the other and electrically conductively connected via a line 29. The first and the third fixed contact 5.1, 5.3 are attached to an adjacent contact rod 20 and also electrically connected via a line 28. The third and the fourth fixed contact 5.3, 5.4 are each formed such that when turning the shutter tube 21 of the second moving contact 8 of the respective fixed contact 5.3, 5.4. first solves, while the first moving contact 7 moves in parallel, but longer on the first or second fixed contact 5.1, 5.2 remains switched.

Each moving contact 7, 8 comprises a housing 50 and resiliently mounted contact fingers 51 extending from a first end 52 to a second end 53 through the interior of the housing 50. Between the first end 52 of the contact fingers 51 and the respective diverter ring 24, 25 there is a sliding connection, which is always ensured during the rotation of the switching tube 21. The second end 53 of the contact fingers 51 also slides on the respective fixed contacts 5.1-5.4 on or from these.

On the switching tube 21, a cam 30 is also mounted, which also performs a pivoting movement during the rotation of the switching tube 21. The cam 30 cooperates in the pivoting movement with a rocker arm assembly 31 through which the vacuum interrupter 6 is opened or closed.

The switching arrangement 1 is constructed such that by the arrangement of the moving contacts 7, 8, the fixed contacts 5.1-5.4 and the cam 30 on the switching tube 21, a switching according to FIG. 2a-2g can be performed.

In FIG. 5a a second embodiment of the switching arrangement 1 is shown schematically. This embodiment is similar to the first embodiment, so that below all the differences are explained in detail.

In this embodiment, the switching arrangement 1 comprises a fourth connection terminal 3.6, which can be connected to a third tap 3.5 of the second winding 3 between the first tap 3.3 and the second tap 3.4, preferably in the middle. At the fourth terminal 3.6, an electrically connected to the ground potential 9 resistor 10 is connected. This serves as a polarity resistor when switching the switching device. 1

In FIG. 5b a third embodiment of the switching arrangement 1 is shown schematically. This embodiment is similar to the second embodiment, so that below the differences are explained in detail.

In this embodiment, an isolator 11 is connected between the ground potential 9 and the resistor 10, by means of which the resistor 10 can be electrically separated from the ground potential 9. The release switch 11 is closed before the operation of the two moving contacts 7, 8 and opened after the switching of the moving contacts 7, 8 carried out.

In FIG. 5c a fourth embodiment of the switching arrangement 1 is shown schematically. This embodiment is similar to the third embodiment, so that below the differences are explained in detail.

In this embodiment, a vacuum interrupter 12 is connected between the ground potential 9 and switch 11, with the aid of which the resistor 10 can be electrically separated from the ground potential 9 before the release switch 11 is actuated. The arrangement or sequence of resistor 10, switch 11 and vacuum interrupter 12 between the fourth terminal 3.6 and the ground potential 9 can be designed arbitrarily. The vacuum interrupter 12 is closed after closing the release switch 11, thus before the operation of the moving contacts 7, 8. The vacuum interrupter 12 is opened before opening the release switch 11, thus thus after the actuation of the moving contacts 7, 8.

In FIG. 5d a fifth embodiment of the switching arrangement 1 is shown schematically. This embodiment is similar to the fourth embodiment, so that below all the differences are explained in detail.

In this embodiment eliminates the switch 11, so that between the ground potential 9 and the resistor 10, only the vacuum interrupter 12 is arranged.

In FIG. 6 a sixth embodiment of the switching arrangement 1 is shown schematically. This embodiment is similar to the first embodiment, so that below all the differences are explained in detail.

In this embodiment, the first winding 2 is formed as a control winding and the second winding 3 as a parent winding and the second tap 3.4 is arranged by way of example at one point in the lower third of the second winding 3, wherein the part between the taps 3.3 and 3.4 as a coarse stage winding or coarse stage 54 denotes becomes. The switching arrangement 1 fulfills the function of a coarse selector. However, the second tap 3.4 can also be arranged at any other point of the second winding 3.

In FIG. 7 a seventh embodiment of the switching arrangement 1 is shown schematically. This embodiment is similar to the sixth embodiment, so that below all the differences are explained in detail.

In this embodiment, the switching arrangement 1 comprises a fourth connection terminal 3.6, which can be connected to a third tap 3.5 of the second winding 3 between the first tap 3.3 and the second tap 3.4, preferably in the middle. At the fourth terminal 3.6, similar to the fifth embodiment, connected to ground potential 9 electrically connected series circuit of resistor 10, switch 11 and vacuum interrupter 12 is connected. The resistor 10 serves as a polarity resistor when switching the switching arrangement 1. Depending on requirements, the release switch 11 and / or vacuum interrupter 12 can also be omitted.

REFERENCE NUMBERS

1

switching arrangement

2

first winding

2.1

first terminal of 1

3

second winding

3.1 / 3.2

second / third terminal of 1

3.3 / 3.4

first / second tap of 3

3.5

fourth tap of 3

3.6

fourth terminal of 1

4

regulating transformer

5.1 / 5.2 / 5.3 / 5.4

first / second / third / fourth fixed contact of 1

6

Vacuum interrupter

7

first moving contact of 1

8th

second moving contact of 1

9

ground potential

10

resistance

11

circuit breaker

12

Vacuum interrupter

13

taps

20

Contact staff

21

switching tube

22

upper holder

23

lower holder

24

first diverter ring

25

second diverter ring

26

management

27

management

28

management

29

management

30

cam

31

rocker arm

40

secondary side

41

cover

42

transformer housing

43

outer wall

44

interior

45

diverter switch

46

OLTC

47

voter

48

motor drive

50

casing

51

contact fingers

52

first end

53

second end

54

coarse stage

Claims (10)

1. Switch assembly (1), particularly preselector, for a regulating transformer (4), which comprises a first winding (2) and a second winding (3) with a first tap (3.3) and second tap (3.4), comprising:

   - a first connection terminal (2.1) connectible with the first winding (2);

   - a second connection terminal (3.1) connectible with the first tap (3.3);

   - a third connection terminal (3.2) connectible with the second tap (3.4);

   - a first, second, third and fourth fixed contact (5.1, 5.2, 5.3, 5.4);

   - a vacuum interrupter (6);

   - a first movable contact (7) selectably contactable with the first or second fixed contact (5.1, 5.2); and

   - a second movable contact (8) selectably contactable with the third or fourth fixed contact (5.3, 5.4);

   wherein

   - the second and fourth fixed contacts (5.2, 5.4) are connected with the second connection terminal (3.1);

   - the first and third fixed contacts (5.1, 5.3) are connected with the third connection terminal (3.2);

   - the first movable contact (7) is connected with the first connection terminal (2.1) by way of the vacuum interrupter (6); and

   - the second movable contact (8) is connected with the first connection terminal (2.1);

   - the vacuum interrupter (6) is mounted to be stationary or fixed in location relative to the first and the second movable contact (7, 8).
2. Switch assembly (1) according to the preceding claim, wherein

   - the vacuum interrupter (6) is mounted in stationary position between an upper mount (22) and a lower mount (23) on at least one contact rod (20).
3. Switch assembly (1) according to the preceding claim, wherein

   - a rocker lever (31) for opening and closing the vacuum interrupter (6) is mounted in the upper mount (22).
4. Switch assembly (1) according to any one of the preceding claims, wherein

   - the movable contacts (7, 8) are mounted on a switching tube (21) in parallel one above the other;

   - the switching tube (21) is mounted to be rotatable; and

   - the movable contacts (7, 8) execute a pivot movement through rotation of the switching tube (21).
5. Switch assembly (1) according to the preceding claim, wherein

   - a cam disc (30) is mounted on the switching tube (21);

   - the cam disc (30) executes a pivot movement through rotation of the switching tube (21); and

   - the cam disc (30) mechanically co-operates with the rocker lever (31) in the upper mount (22) and opens or closes the vacuum interrupter (6).
6. Switch assembly (1) according to any one of the preceding claims, wherein

   - each movable contact (7, 8) comprises a housing (50) with contact fingers (51), which at a first end (52) are mechanically slidably and electrically conductively connected with a diverter ring (24, 25) associated with the respective movable contact (7, 8) and at a second end (53) can be selectably connected with the respective fixed contact (5.1, 5.2, 5.3, 5.4).
7. Switch assembly (1) according to any one of the preceding claims, wherein

   - the first tap (3.3) and the second tap (3.4) are each arranged at a respective end of the second winding (3).
8. Switch assembly (1) according to any one of the preceding claims, comprising

   - a fourth connection terminal (3.6) connectible with a third tap (3.5) of the second winding (3) between the first tap (3.3) and the second tap.(3.4); and

   - a resistor (10) connected with the fourth connection terminal (3.6).
9. Switch assembly (1) according to the preceding claim, comprising

   - an isolator (11) connected with the fourth connection terminal (3.6) in series with the resistor (10) and/or a vacuum interrupter (12) connected with the fourth connection terminal (3.6) in series with the resistor (10).
10. Switch assembly (1) according to any one of the preceding claims, which is constructed as a preselector, reverser or coarse selector.

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