EP3189535B1 - Switching arrangement for a control transformer, in particular polarity switching means - Google Patents

Description

The present invention relates to a switching arrangement for a regulating transformer, in particular a polarization circuit.

From the DE 10 2009 060 132 B3 A tap changer with a selection and a polarity circuit is known, with the help of which gas formation in the insulating oil is to be reduced. The tap changer includes a selector and a diverter switch. Before a changeover, the selector initially selects the new winding tap of the step winding to be switched over without power. The changeover itself is carried out by the diverter switch. At the beginning of the step winding, a first polarity resistor is connected, which is connected to a load derivation via a first polarity switch. At the end of the step winding, a second polarity resistor is connected, which in turn is connected to the load discharge via a second polarity switch. The two polarity switches are only switched on briefly before the preselector is operated, so that the start and end of the step winding are only briefly linked to a defined electrical potential. A disadvantage of this solution is that when the polarity resistors are switched on and off, an arc can occur, which can cause the insulating oil in the tap changer to decompose. This can result in undesired chemical products, such as soot and gases, which contaminate the insulating oil and thus shorten the lifespan of the tap changer or regulating transformer, which is also referred to as a tap transformer.

It is an object of the invention to provide a switching arrangement for a control transformer, which enables trouble-free and gas-free operation of a control transformer.

This object is solved by the subject matter of the independent claims. Advantageous further 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 electrically conductively connected directly to B” and “A is indirectly, that is to say via C, electrically to B. conductively connected ", and has a formulation of the type" A is connected to B "meaning" A is electrically conductively connected to B ".

• eine erste Anschlussklemme, die mit der Wicklung verbunden werden kann;
• eine zweite Anschlussklemme, die mit einer Ableitung verbunden werden kann;
• eine Vakuumschaltröhre;
• einen Freischalter;
• einen Widerstand, der in Reihe mit der Vakuumschaltröhre und dem Freischalter geschaltet ist;
  wobei
• die erste Anschlussklemme über die Reihenschaltung mit der zweiten Anschlussklemme verbunden ist.

The invention proposes a switching arrangement for a regulating transformer, which comprises a first winding for a phase of an AC network to be regulated, comprising

• a first terminal that can be connected to the winding;
• a second connector that can be connected to a derivative;
• a vacuum interrupter;
• a switch;
• a resistor connected in series with the vacuum interrupter and the isolator;
  in which
• the first connection terminal is connected to the second connection terminal via the series connection.

The proposed switching arrangement reduces or avoids the decomposition and gas formation of the insulating oil when the resistor is switched on and off by using the vacuum interrupter.

The proposed switching arrangement can be designed in any manner as required and can comprise, for example, at least one or no additional connecting terminal and / or at least one or no additional vacuum interrupter and / or at least one or no additional disconnector and / or at least one or no additional resistor.

The connection of the first connection terminal to the winding can preferably take place in such a way that the first connection terminal is or is connected to an intermediate tap of the winding which lies between the two winding ends of the winding.

The isolator can be designed as required in any manner, for example in such a way that it or at least its contacts are in a dielectric medium or air or SF6 or insulating oil and / or that it comprises, for example, no vacuum interrupter and no semiconductor switch.

• der Freischalter wenigstens einen ortsfesten Aufschaltkontakt und wenigstens ein elektrisch leitfähiges, bewegliches Lagergehäuse, das wahlweise an den Aufschaltkontakt angelegt oder von dem Aufschaltkontakt getrennt werden kann, umfasst.

It is also provided that

• the isolator comprises at least one stationary switch-on contact and at least one electrically conductive, movable bearing housing, which can either be placed on the switch-on contact or separated from the switch-on contact.

The opening contact is preferably fixedly attached to a frame. The bearing housing preferably comprises on the outside at least one spring-mounted contact which, in the closed state of the isolator, establishes an electrically conductive connection between the opening contact and the bearing housing.

• einen drehbar gelagerten Polungsrotor, der durch Drehung den Freischalter und die Vakuumschaltröhre betätigt, insbesondere öffnet oder schließt, und an dem insbesondere das Lagergehäuse angebracht ist.

It is also provided that the switching arrangement comprises

• a rotatably mounted polarity rotor which actuates, in particular opens or closes, the disconnector and the vacuum interrupter by rotation, and on which, in particular, the bearing housing is attached.

• der Polungsrotor eine obere und eine untere Trägerplatte aufweist, zwischen denen die Vakuumschaltröhre vertikal stehend angebracht ist;
• die Vakuumschaltröhre einen Festkontakt und einen Bewegtkontakt aufweist;
• der Festkontakt an der unteren Trägerplatte angeordnet ist und der Bewegtkontakt mechanisch mit der oberen Trägerplatte verbunden ist;
• eine Antriebswelle vertikal zwischen den Trägerplatten angeordnet ist, über die der Polungsrotor gedreht werden kann.

It is also provided that

• the polarization rotor has an upper and a lower support plate, between which the vacuum interrupter is mounted vertically;
• the vacuum interrupter has a fixed contact and a moving contact;
• the fixed contact is arranged on the lower carrier plate and the moving contact is mechanically connected to the upper carrier plate;
• a drive shaft is arranged vertically between the carrier plates, via which the polarization rotor can be rotated.

• der Bewegtkontakt mechanisch mit einem Betätigungshebel verbunden ist;
• der Betätigungshebel mit einem ersten Ende im Lagergehäuse schwenkbar gelagert ist;
• der Betätigungshebel an einem zweiten Ende eine Rolle trägt.

It is also provided that

• the moving contact is mechanically connected to an operating lever;
• the actuating lever is pivotally mounted with a first end in the bearing housing;
• the operating lever carries a role at a second end.

• einen Kurvenzylinder, in dem der Polungsrotor drehbar angeordnet ist;
  wobei
• der Kurvenzylinder an einem oberen Rand eine Kontur mit wenigstens einem Konturabschnitt aufweist;
• die Rolle durch Drehung des Polungsrotors wenigstens einen Konturabschnitt abfährt und damit die Vakuumschaltröhre betätigt, insbesondere geöffnet oder geschlossen, wird.

It can be provided that the switching arrangement comprises

• a cam cylinder in which the polarity rotor is rotatably arranged;
  in which
• the cam cylinder has a contour with at least one contour section at an upper edge;
• the roller travels at least one contour section by rotating the polarization rotor and thus the vacuum interrupter is actuated, in particular opened or closed.

• zu jeder zusätzlichen Wicklung
  • eine zusätzliche erste Anschlussklemme, die mit der zusätzlichen Wicklung verbunden werden kann,
  • eine zusätzliche zweite Anschlussklemme, die mit einer Ableitung verbunden werden kann,
  • eine zusätzliche Vakuumschaltröhre,
  • einen zusätzlichen Freischalter und
  • einen zusätzlichen Widerstand, der in Reihe mit der zusätzlichen Vakuumschaltröhre und dem zusätzlichen Freischalter geschaltet ist;
• ein Betätigungsmittel zum Betätigen der Vakuumschaltröhren in vorbestimmter Abfolge;
  wobei
• jede zusätzliche erste Anschlussklemme über die zugeordnete Reihenschaltung mit der zugeordneten zweiten Anschlussklemme verbunden ist.

It can be provided that the switching arrangement for the regulating transformer, which comprises an additional first winding for at least one additional phase to be regulated in the AC network, is designed and includes

• for each additional winding
  • an additional first connection terminal that can be connected to the additional winding,
  • an additional second connection terminal that can be connected to a derivative,
  • an additional vacuum interrupter,
  • an additional switch and
  • an additional resistor connected in series with the additional vacuum interrupter and the additional isolator;
• an actuating means for actuating the vacuum interrupters in a predetermined sequence;
  in which
• each additional first connection terminal is connected to the assigned second connection terminal via the assigned series connection.

• das Betätigungsmittel derart ausgebildet ist, dass wenigstens zwei Vakuumschaltröhren zueinander zeitversetzt betätigt, insbesondere geöffnet oder geschlossen, werden.

It can be provided that

• the actuating means is designed such that at least two vacuum interrupters are actuated, in particular opened or closed, at different times from one another.

• das Betätigungsmittel den Kurvenzylinder umfasst;
• jeder Vakuumschaltröhre wenigstens ein Konturabschnitt zugewiesen ist.

It can be provided that

• the actuating means comprises the cam cylinder;
• at least one contour section is assigned to each vacuum interrupter.

• die Konturabschnitte derart ausgebildet sind, dass beim Drehen des Polungsrotors wenigstens zwei Vakuumschaltröhren zueinander zeitversetzt betätigt, insbesondere geöffnet oder geschlossen, werden.

It can be provided that

• the contour sections are designed such that when the polarity rotor is rotated, at least two vacuum interrupters are actuated, in particular opened or closed, at different times from one another.

• einen Vorwähler, umfassend
  • eine erste Vorwählerklemme, die mit dem ersten Wicklungsabgriff verbunden werden kann;
  • eine zweite Vorwählerklemme, die mit dem zweiten Wicklungsabgriff verbunden werden kann;
  • eine Basisklemme, die mit der zweiten Wicklung verbunden werden kann;
  • einen Vorwählerkontakt, der mit der Basisklemme verbunden ist und wahlweise mit der ersten oder zweiten Vorwählerklemme verbunden werden kann;
    wobei
• die erste Anschlussklemme mit der Wicklung durch Verbinden mit dem Zwischenabgriff verbunden werden kann.

It can be provided that the switching arrangement for the regulating transformer, which comprises a second winding for at least one phase to be regulated, the first winding assigned to this phase being designed and comprising a first and a second winding tap and an intermediate tap between the winding taps

• a selection comprising
  • a first selector terminal that can be connected to the first winding tap;
  • a second selection terminal that can be connected to the second winding tap;
  • a base terminal that can be connected to the second winding;
  • a preselector contact which is connected to the base terminal and can optionally be connected to the first or second preselector terminal;
    in which
• the first connection terminal can be connected to the winding by connecting to the intermediate tap.

• der Vorwähler als Wender oder Grobwähler oder Mehrfachgrobwähler ausgebildet ist.

It can be provided that

• the selection is designed as a turner or coarse selector or multiple coarse selector.

If the selection is designed as a turner, then the second winding is designed as a main winding and the first winding as a control winding, for example. A turner makes it possible to connect the standard winding with the main winding either in the same direction or in the opposite direction to the main winding.

If the preselector is designed as a coarse selector, then the second winding is designed as a control winding and the first winding as a main winding, for example, and the first winding tap is located at the first winding end of the first winding and the second winding tap is between the winding ends of the first winding or, for example, the second Winding tap at the second winding end of the first winding and the first winding tap between the winding ends or, for example, both winding taps are located between the winding ends. The part between the winding taps is usually referred to as coarse step winding or coarse step. A coarse selector makes it possible to connect the coarse stage winding with the control winding or not, that is, to bridge the coarse stage winding.

Embodiments of the invention are explained in more detail below 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 only as explanatory, but not restrictive. The reference numerals 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 Vorwähler sowie eine erfindungsgemäße Schaltanordnung umfasst;

FIG. 2a-h

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

FIG. 3

eine Perspektivansicht eines Polungsrotors für die Schaltanordnung der FIG. 7;

FIG. 4

eine Perspektivansicht eines Kurvenzylinders für die Schaltanordnung der FIG. 7 mit dem Polungsrotor der FIG. 3;

FIG. 5

einen Schnitt längs der Linie A-A der FIG. 4;

FIG. 6

eine Draufsicht zu der FIG. 4 bei entfernten Lagergehäusen;

FIG. 7

eine Perspektivansicht einer bevorzugten Ausführungsform der Schaltanordnung der FIG. 2a-h als konstruktive Ausgestaltung für drei Phasen;

FIG. 8

ein Schaltbild einer zweiten Ausführungsform der Schaltanordnung.

The drawings show in

FIG. 1

a regulating transformer with an on-load tap changer which comprises a diverter switch and a preselector as well as a switching arrangement according to the invention;

FIG. 2a-h

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

FIG. 3rd

a perspective view of a polarization rotor for the switching arrangement of FIG. 7 ;

FIG. 4th

a perspective view of a cam cylinder for the switching arrangement of FIG. 7 with the polarization rotor FIG. 3rd ;

FIG. 5

a section along the line AA of the FIG. 4th ;

FIG. 6

a top view of the FIG. 4th with removed bearing housings;

FIG. 7

a perspective view of a preferred embodiment of the switching arrangement of FIG FIG. 2a-h as a design for three phases;

FIG. 8th

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

In FIG. 1 An exemplary embodiment of a regulating transformer 10 is shown schematically, which comprises an upper voltage or primary side with two windings 2, 7, an undervoltage or secondary side 8 and an on-load tap changer 11. The on-load tap changer 11 comprises a diverter switch 12, a selector with a preselector 9 and a fine selector 13 and a switching arrangement 1 according to the invention. The regulating transformer 10 is surrounded by a transformer housing 14. With the on-load tap changer 11 arranged in the interior 15 of the transformer housing 14, the different taps 2.1 (see FIG. 2nd ) of the control transformer 10 are connected. In order to be able to ensure proper functioning of the control transformer 10, the on-load tap changer 11 must carry out the required switching sequence without interference. The on-load tap changer 11 projects into the transformer housing 14, which, depending on the type of the regulating transformer 10, can be filled with insulating oil. The on-load tap changer 11 comprises, for example, diverter switch 12 and preselector 9, but can also be designed as a load selector.

The on-load tap-changer 11 is operated by means of a motor drive 16 on an outer wall 17 of the transformer housing 14 is attached, operated via a linkage. However, the motor drive 16 can also be arranged directly on the cover 18 of the on-load tap changer 11, that is to say on the head of the on-load tap changer 11.

The regulating transformer 10 usually comprises a first winding 2 and a second winding 7 for each phase of an AC network, not shown, on the primary side. The switching arrangement 1 can, for example, as a polarity circuit temporarily switch the first winding 2 during the switching of the first winding 2 and the Connect the second winding 7 connected preselector 9 electrically with a derivative, as follows using the FIG. 2nd is described in detail.

In this embodiment, the preselector 9 is formed separately from the switching arrangement 1, but it can also be integrated in the switching arrangement 1 or combined with the switching arrangement 1.

In FIG. 2a a circuit diagram of a first embodiment of the switching arrangement 1 for a regulating transformer 10 is shown schematically.

In this embodiment, the first winding 2 is designed as a control winding, the second winding 7 as a main winding, which is assigned to the control winding, and the preselector 9 as a turner for the control winding 2, but the first winding 2 can also be a coarse step winding, the second winding 7 as a control winding, which is assigned to the coarse stage winding, and the preselector 9 as a coarse selector for the coarse stage winding. The control winding 2 has taps 2.1, two winding taps 2.2, 2.3, which are, for example, at the winding ends of the control winding 2 and / or form these winding ends, and between these winding taps 2.2, 2.3, an intermediate tap 2.4, which, for example, lies in the middle of the control winding 2.

The switching arrangement 1 comprises two connecting terminals 1.1, 1.2, a vacuum interrupter 4, a disconnector 5 and a resistor 6. The first connecting terminal 1.1 is connected to the intermediate tap 2.4 and the second connecting terminal 1.2 to a lead 3. The lead 3 is connected to the ground potential as an example, but it can also be connected directly or indirectly to another defined electrical potential, which can be, for example, a star point, ground or a triangle point of a transformer, directly or indirectly via a lead rail.

The vacuum interrupter 4, the isolator 5 and the resistor 6 are connected in series between the first connection terminal 1.1 and the second connection terminal 1.2. so that the connection terminals 1.1, 1.2 are connected to one another in an electrically conductive manner via the series connection.

In the in FIG. 2a shown steady state of the switching arrangement 1, the isolator 5 is open and the vacuum interrupter 4 is closed. This ensures that the bearing housing 24 ( FIG. 3rd ) of the disconnector 5 and the vacuum interrupter 4 are at the same defined potential, whereas the opening contact 32 ( FIG. 5 ) of the isolator 5 and the resistor 6 are at a different potential.

The control winding 2 can, for example, be connected in the same direction or in the opposite direction to the main winding 7 via the preselector 9. The preselector 9 thus forms a turner and has two preselector terminals 9.1, 9.2, a base terminal 9.3 and a movable preselector contact 9.4, which is connected to the base terminal 9.3 and can optionally be brought into electrical contact with each preselector terminal 9.1, 9.2. The first preselector terminal 9.1 is connected to the first winding tap 2.2, the second preselector terminal 9.2 to the second winding tap 2.3, and the base terminal 9.3 to the main winding 7.

In FIG. 2b to 2h is the switching sequence of the switching arrangement 1 based on the steady state of the FIG. 2a pictured.

FIG. 2 B shows the first step in which the vacuum interrupter 4 is opened.

FIG. 2c shows the second step in which the isolator 5 is closed.

FIG. 2d shows the third step in which the vacuum interrupter 4 is closed. The resistor 6 is now connected to the lead 3 in an electrically conductive manner.

FIG. 2e shows the fourth step in which the preselector 9 switches and for this purpose disconnects the preselector contact from the second preselector terminal 9.2 and connects it to the first preselector terminal 9.1. In the meantime, the center of the control winding 2 is at ground potential via the switching arrangement 1.

FIG. 2f shows the fifth step in which the vacuum interrupter 4 is opened.

FIG. 2g shows the sixth step in which the isolator 5 is opened.

FIG. 2h shows the seventh step in which the vacuum interrupter 4 is closed. The switching arrangement 1 has now reached a steady state again, in which the isolator 5 is open and the vacuum interrupter 4 is closed.

The switching sequence can therefore be divided into two phases. The resistance 6 is switched on in the first phase and the resistance 6 is switched off in the second phase. The preselector 9 is usually actuated between these phases.

In FIG. 3 to 7 is a preferred embodiment of the switching arrangement 1 of the FIG. 2a-h shown schematically as a design for three phases.

In this embodiment, the switching arrangement 1 comprises a rotatably mounted polarization rotor 20, which is shown in FIG FIG. 3rd is shown. The polarization rotor 20 comprises a lower and an upper carrier plate 21, 22, between which a drive shaft 23 is arranged. The drive shaft 23 is mechanically connected to the carrier plates 21, 22 such that when the drive shaft 23 is rotated, the carrier plates 21, 22 are also rotated. The carrier plates 21, 22 have, for example, the basic shape of an equilateral triangle, a vacuum interrupter 4 being mounted in a vertical direction between the carrier plates 21, 22 at each corner. Each vacuum interrupter 4 has a fixed contact 4.1 and a moving contact 4.2, the fixed contact 4.1 being attached to the lower carrier plate 21 by way of example. Each moving contact 4.2 extends through the upper support plate 22 and is mechanically and electrically connected to a bearing housing 24.

In this embodiment, the switching arrangement 1 comprises a cam cylinder 25, which in FIG FIG. 4th and 5 is shown. The polarization rotor 20 is arranged vertically standing in the cam cylinder 25. The cam cylinder 25 consists of an electrically insulating material, preferably a glass fiber composite material. The upper edge 26 of the curved cylinder 25 has a profiled contour 27 and is in particular designed as a circumferential profiled contour 27. The contour 27 serves to actuate the vacuum interrupters 4. For this purpose, an actuating lever 28 with a roller 29 is provided in each bearing housing 24. The actuating lever 28 is rotatably mounted on the bearing housing 24 at a first end 30 and carries the roller 29 at a second end 31, which cooperates with the contour 27 when the polarity rotor 20 is rotated. The respective actuating lever 28 and the respective moving contact 4.2 that is operatively connected to it are moved in the vertical direction and the respective vacuum interrupter 4 is opened or closed.

The cam cylinder 25, the polarization rotor 20, the bearing housing 24 and the actuating lever 28 thus form an actuating means for actuating the vacuum interrupters 4 in a predetermined sequence.

In FIG. 6 is the switching arrangement 1 from above without the bearing housing 24 in a state that the end of the third step of FIG. 2d corresponds, shown schematically. The three vacuum interrupters 4 are each arranged at 120 ° to the drive shaft 23, evenly offset from one another. The contour 27 comprises six contour sections 34, 35, 36, 37, 38, 39, of which the first and second contour sections 34, 35 of a first vacuum interrupter 4, the third and fourth contour sections 36, 37 of a second vacuum interrupter 4 and the fifth and sixth Contour section 38, 39 are assigned to a third vacuum interrupter 4. Each contour section 35-39 is designed as an elevation in the upper edge 26 and is delimited by two intermediate sections 34 ', 35', 36 ', 37', 38 ', 39', which are designed as a depression in the upper edge 26; however, it is also possible for each contour section 35-39 to be designed as a depression and each intermediate section 34'-39 'as an elevation in the upper edge 26. Since three vacuum interrupters 4 have to be actuated to open them, the three corresponding contour sections 34, 36, 38 and the three corresponding contour sections 35, 37, 39 are each offset by 120 ° to one another.

In the stationary state of the switching arrangement 1 ( Fig. 2a , 2h , 4th , 5 ) and in the state at the end of the third step ( FIG. 2d , 6 ) and in the state at the end of the fourth step ( FIG. 2e ) the vacuum interrupters 4 are closed. In order to be able to ensure this, the intermediate sections 34'-39 'are designed and in particular so deep that the respective roller 29 on the actuating lever 28 no longer rests on the contour 27 and the upper edge 26. This ensures that each moving contact 4.2 reaches its lowest position and the respective vacuum interrupter 4 is closed. However, it is also possible for the intermediate sections 34'-39 'to be designed and in particular so deep that the respective roller 29 rests on the actuating lever 28 on the contour 27 and the upper edge 26.

As an example, the cam cylinder 25 is arranged in a stationary manner and the polarity rotor 20 is rotatably mounted, however, the reversal is also possible. Since the rollers 29 lie at least in the contour sections 35-39 on the upper edge 26, when the polarity rotor 20 rotates, they run off the contour 27 or at least the contour sections 35-39 and accordingly open and close the respective vacuum interrupters 4 by means of the actuating levers 28.

In this embodiment, the three corresponding contour sections 34, 36, 38 have different lengths, for example the first contour section 34 being longer than the fifth contour section 38 and this being longer than the third contour section 36 is. The other three corresponding contour sections 35, 37, 39 also have different lengths, for example the second contour section 35 being longer than the sixth contour section 39 and this being longer than the fourth contour section 37. It is hereby achieved that when the polarity rotor 20 is rotated, the vacuum interrupters 4 are opened and closed with a slight time lag, regardless of their direction of rotation D. Preferably, the first contour section 34 is longer than the fifth contour section 38, this is as long as the second contour section 35 and longer than the sixth contour section 39, this is longer than the fourth contour section 37, and this is as long as the third contour section 36. But it is it is also possible that all contour sections 35-39 have the same length.

Especially when opening the vacuum interrupters 4, it is advantageous that this is done one after the other, ie with a time delay, in order to keep the torque required for this as low as possible.

In this embodiment, the switching arrangement 1 comprises an open contact 32 for each bearing housing 24, which is shown in FIG FIG. 7 is shown. Each switch contact 32 is stationary and is preferably attached to a frame 33. The combination of an opening contact 32 and the associated bearing housing 24 forms the respective isolator 5, which is actuated by rotating the polarization rotor 20, that is to say opened and closed. Since each vacuum interrupter 4, the bearing housing 24 associated with this vacuum interrupter 4, the switching contact 32 associated with this vacuum interrupter 4, the drive shaft 23 and the lower carrier plate 21 are connected to one another in an electrically conductive manner, it is possible to selectively establish or separate the connection between the bearing housing 24 and switch-on contact 32, that is, the optional opening and closing of the isolator 5, and the optional closing and opening of the vacuum interrupter 4, an electrically conductive connection between the first connection terminal 1.1 and the second connection terminal 1.2 optionally, for example in accordance with the above using the FIG. 2a-h described methods of producing and separating.

The bearing housing 24 can have resiliently mounted contacts 19 on its outside, which enable reliable contacting between the opening contact 32 and the bearing housing 24.

In FIG. 8th a circuit diagram of a second embodiment of the switching arrangement 1 for a regulating transformer 10 is shown schematically. This embodiment is similar to the first embodiment, so that the differences are explained in more detail below will.

In this embodiment, the first winding 2 is designed as a coarse step winding, which forms part of a main winding 40, the second winding 7 as a control winding, which is assigned to the coarse step winding 2, and the preselector 9 as a coarse selector for the coarse step winding 2. The control winding 7 has taps 7.1. The second winding tap 2.3 of the coarse step winding 2 is, for example, between its winding ends. However, it is also possible that, for example, the first winding tap 2.2 of the coarse step winding 2 lies between its winding ends and the second winding tap 2.3 lies at its second winding end and / or forms this winding end, or that, for example, both winding taps 2.2, 2.3 lie between these winding ends.

The coarse stage winding 2 can be connected to the control winding 7 or not, for example, via the preselector 9, that is to say it can be bridged. The preselector 9 thus forms a coarse selector.

REFERENCES

1

Switching arrangement

1.1 / 1.2

first / second connection terminal of 1

2nd

first winding, standard winding, coarse winding of 10

2.1

Taps from 2

2.2 / 2.3

first / second winding tap of 2

2.4

Intermediate tap of 2

3rd

Derivative

4th

Vacuum interrupter

4.1 / 4.2

Fixed contact / moving contact from 4

5

Unlock

6

resistance

7

second winding, main winding, control winding of 10

7.1

Taps from 7

8th

Secondary page of 10

9

Selection

9.1 / 9.2 / 9.3 / 9.4

first / second selector terminal / basic terminal / selector contact from 9

10th

Control transformer

11

On-load tap-changer

12

Diverter switch

13

Fine-tuner

14

Transformer housing

15

Interior of 14

16

Motor drive

17th

Outer wall of 14

18th

Lid of 11

19th

Contacts from 24

20th

Polarity rotor

21st

lower support plate from 20

22

upper support plate from 20

23

drive shaft

24th

Bearing housing

25th

Cam cylinder

26

top margin of 25

27th

Contour of 26

28

Operating lever

29

role

30th

first end of 28

31

second end of 28

32

Contact

33

framework

34

first contour section of 27

34 '

first intermediate section of 27

35

second contour section of 27

35 '

second intermediate section of 27

36

third contour section of 27

36 '

third intermediate section of 27

37

fourth contour section of 27

37 '

fourth intermediate section of 27

38

fifth contour section of 27

38 '

fifth intermediate section of 27

39

sixth contour section of 27

39 '

sixth intermediate section of 27

Claims (8)

1. Switching arrangement (1), as polarity switching mean, for a regulating transformer (10), which comprises a first winding (2) for a phase, which is to be regulated, of an alternating current mains, comprising

   - a first connection terminal (1.1) connectible with the winding (2);

   - a second connection terminal (1.2) connectible with a diverter (3);

   - a vacuum interrupter (4) with a fixed contact (4.1) and a movable contact (4.2);

   - a isolator (5) with a stationary switching-on contact (32) and an electrically conductive movable bearing housing (24);

   - a resistor (6) connected in series with the vacuum interrupter (4) and the isolator (5);

   - the polarity rotor (20) has an upper support plate (21) and lower support plate (22), between which the vacuum interrupter (4) is mounted to be vertical and on which the bearing housing (24) is mounted;

   - a drive shaft (23) by way of which the polarity rotor (20) can be rotated is arranged vertically between the support plates (21, 22);
   wherein

   - the first connection terminal (1.1) is connected with the second connection terminal (1.2) by way of the series circuit;

   - the isolator (5) and the vacuum interrupter (5) are actuated by rotation of the polarity rotor (20);

   - a bearing housing (24) can be selectively applied to the switching-on contact (32) or separated from the switching-on contact (32);

   - the fixed contact (4.1) is arranged at the lower support plate (21) and the movable contact (4.2) is mechanically connected to the upper support plate (22);

   - the movable contact (4.2) is mechanically connected with an actuating lever (28);

   - the actuating lever (28) is pivotably mounted by a first end (30) in the bearing housing (24) and carries a roller (29) at a second end (31).
2. The switching arrangement according to the previous claim, comprising- a cam cylinder (25) in which the polarity rotor (20) is rotatably arranged;
   wherein

   - the cam cylinder (25) has at an upper edge (26) a contour (27) with at least one contour section (34, 35, 36, 37, 38, 39); and

   - the roller (29) during rotation of the polarity rotor (20) travels along at least one contour section (34-39) and thus the vacuum interrupter (4) is actuated.
3. Switching arrangement (1) according to any one of the preceding claims for the regulating transformer (10), which comprises - for at least one additional phase, which is to be regulated, of the alternating current mains - a respective additional first winding (2), comprising:

   - for each additional winding (2)

   - an additional first connection terminal (1.1) connectible with the additional winding (2),

   - an additional second connection terminal (1.2) connectible with a diverter (3),

   - an additional vacuum interrupter (4),

   - an additional isolator (5) and

   - an additional resistor (6) connected in series with the additional vacuum interrupter (4) and the additional isolator (5);

   - and actuating means for actuating the vacuum interrupters (4) in a predetermined sequence;
   wherein

   - each additional first connection terminal (1.1) is connected with the associated second connection terminal (1.2) by way of the associated series circuit.
4. Switching arrangement (1) according to the preceding claim, wherein

   - the actuating means is so constructed that at least two vacuum interrupters (4) are actuated with an offset in time relative to one another.
5. Switching arrangement (1) according to any one of the preceding claims, wherein

   - the actuating means comprises the cam cylinder (25); and at least one contour section (34, 35, 36, 37, 38, 39) is assigned to each vacuum interrupter (4).
6. Switching arrangement (1) according to the preceding claim, wherein

   - the cam sections (34, 35, 36, 37, 38, 39) are so constructed that when the polarity rotor (20) is rotated at least two vacuum interrupters (4) are actuated with an offset in time relative to one another.
7. Switching arrangement (1) according to any one of the preceding claims for the regulating transformer (10), which comprises a second winding (7) for at least one phase to be regulated, wherein the first winding (2) associated with this phase has a first winding tap (2.2) and second winding tap (2.3) and an intermediate tap (2.4) between the winding taps (2.2, 2.3), comprising

   - a preselector (9), which comprises

   - a first preselector terminal (9.1) connectible with the first winding tap (2.2);

   - a second preselector terminal (9.2) connectible with the second winding tap (2.3);

   - a base terminal (9.3) connectible with the second winding (7); and

   - a preselector contact (9.4) which is connected with the base terminal (9.3) and selectably connectible with the first or second preselector terminal (9.1, 9.2);

   wherein

   - the first connection terminal (1.1) can be connected with the first winding (2) by connection with the intermediate tap (2.4).
8. Switching arrangement (1) according to the preceding claim, wherein

   - the preselector (9) is constructed as a reverser or coarse selector.

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