EP2927923A1 - Dry transformer load switch - Google Patents

Dry transformer load switch Download PDF

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Publication number
EP2927923A1
EP2927923A1 EP14001201.4A EP14001201A EP2927923A1 EP 2927923 A1 EP2927923 A1 EP 2927923A1 EP 14001201 A EP14001201 A EP 14001201A EP 2927923 A1 EP2927923 A1 EP 2927923A1
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EP
European Patent Office
Prior art keywords
dry
load switch
hollow
radially
transformer load
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14001201.4A
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German (de)
French (fr)
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EP2927923B1 (en
Inventor
Benjamin Weber
Jens Tepper
Martin Carlen
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ABB Schweiz AG
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ABB Technology AG
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Publication date
Application filed by ABB Technology AG filed Critical ABB Technology AG
Priority to EP14001201.4A priority Critical patent/EP2927923B1/en
Priority to PCT/EP2015/054335 priority patent/WO2015150005A1/en
Priority to CN201580017665.6A priority patent/CN106463287B/en
Publication of EP2927923A1 publication Critical patent/EP2927923A1/en
Priority to US15/281,113 priority patent/US10134535B2/en
Application granted granted Critical
Publication of EP2927923B1 publication Critical patent/EP2927923B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0016—Contact arrangements for tap changers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/025—Constructional details of transformers or reactors with tapping on coil or windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00—Contacts
    • H01H2201/01—Protective enclosure

Definitions

  • the invention relates to a dry-type transformer circuit breaker, comprising a hollow insulating cylinder extending longitudinally about a virtual central axis with a plurality of arranged along the inner circumference terminal contacts, and a radially aligned inside the insulating hollow cylinder about the central axis radially aligned main contact which selectively by means of a corresponding rotational movement with its radially outer end is connectable to one of the terminal contacts.
  • transformers are used in power distribution networks to couple power supplies of different voltage levels together.
  • higher voltage levels such as 110kV / 380kV oil transformers are usually used, at underlying voltage levels, dry transformers or gas-filled transformers are common, for example, 30kV, 72.5kV and some even 110kV.
  • Oil transformers often have so-called load switch, by means of which can be changed under load current between different taps of Transformatorwicklurig, so that the voltage in the network can be controlled by adjusting the transmission ratio of the transformer within certain limits.
  • a load switch typically has several along a path arranged Connection contacts, which are connected to different taps of a transformer winding.
  • a main contact is mechanically movable along the track and can thereby be selectively connected to one of the taps.
  • the taps are arranged along a circular path, so that a contacting of the desired tap takes place by a rotational movement of the main contact.
  • circuit breakers are located in an oil-filled area of the transformer tank, which, however, is separated from the area in which the transformer is located for reasons of contamination. Due to the arrangement of such a circuit breaker in the isolation medium oil, this can be designed significantly smaller than in an arrangement in air.
  • a dry-type transformer circuit breaker of the type mentioned in the introduction This is characterized in that in a hollow-cylindrical space determined by radially inner and outer ends of the main contact about the central axis is provided together with the main contact to this rotatable barrier screen.
  • the basic idea of the invention is to provide a barrier screen rotatable together with the main contact so as to improve the electrical strength.
  • the space between the connection contacts lying radially on the outside of the insulating hollow cylinder and the main contact is the region which is the most critical to insulation.
  • the arrangement of a fixed barrier screen is not possible because this hollow cylindrical space around the central axis for an all-round movement of the main contact must be available.
  • the barrier screen comprises a hollow-cylindrical or hollow-cylinder segment-shaped shielding element.
  • a hollow cylinder-like screen element is particularly suitable to be part of a barrier screen in also hollow cylindrical space around the central axis.
  • the barrier screen is preferably provided with a recess in order to avoid direct contact with the live main contact. A isolation-technically disadvantageous shortening of the creepage path is thereby excluded.
  • the barrier screen comprises at least two hollow cylindrical or hollow cylinder segment-shaped shielding elements arranged radially one above the other.
  • At least one hohtzylinderför shaped or hollow cylinder segment-shaped screen element at least a radially aligned inner plate is provided, which preferably extends along the central axis.
  • the at least one radially aligned inner plate protrudes from the hollow cylindrical space about the axis of rotation, but is made of an elastic material such as silicone rubber.
  • the at least one radially aligned inner plate also projects out of the hollow cylindrical space about the axis of rotation, but means are provided for displacing the inner plate radially inwards at least for the duration of a rotational movement of the barrier screen.
  • a radially oriented outer disk is provided on the inner circumference of the hollow insulating cylinder, which protrudes into its inner space.
  • the at least one radially oriented outer plate is made of an elastic material.
  • At least one lamella is also provided on the radially outer surface of the insulating hollow cylinder between protruding connecting contacts, the purpose of which corresponds to that of the aforementioned inwardly projecting outer lamella.
  • corresponding lamellae are provided both on the inside and on the outside of the insulating hollow cylinder.
  • At least one terminal contact projecting radially into the interior of the hollow insulating cylinder is surrounded by a hollow cylindrical barrier.
  • the barrier screen is held by disk elements which are rotatable about the center axis and which are provided at the axial end regions of the hollow insulating cylinder.
  • disk elements which are rotatable about the center axis and which are provided at the axial end regions of the hollow insulating cylinder.
  • direct contact of the barrier screen with the main contact is to be avoided.
  • this can be achieved in particular for the isolation technology relevant area in the hollow cylindrical space around the central axis.
  • the latter is hermetically encapsulated and filled with an insulating gas.
  • An insulating gas such as SF6 advantageously increases the withstand voltage.
  • the object according to the invention is also achieved by a dry-type transformer comprising a transformer core with at least one winding and a load switch, wherein the load switch is a dry-type transformer circuit breaker according to the invention.
  • Fig. 1 shows an exemplary first dry-transformer load switch 10 in a sectional view.
  • a tube-like insulating hollow cylinder 14 of an insulating material for example, a glass fiber / epoxy resin composite material is arranged.
  • a plurality of terminal contacts 14, 16, 18 are guided in its interior in a common plane perpendicular to the central axis 12, in which they protrude.
  • a hollow-cylindrical rotary body 27 with a main contact 22 radially outgoing from its outer surface is also rotatably arranged around the central axis 12.
  • the radially outer end 26 of the main contact 22 is selectively connectable to one of the terminal contacts 14, 16, 18.
  • a hollow cylindrical space 28 is formed around the central axis 12, which sweeps over the main contact in a rotary motion.
  • Fig. 2 shows an exemplary second dry-transformer load switch 30 in a sectional view. This is similar to the previously in the Fig. 1 shown dry-type transformer circuit breaker, however, in this example, a rotatable together with the main contact barrier screen with a hollow cylinder segment-shaped shield member 32 and associated radially aligned inner fins 34, 36 are shown. The electrical insulation capability of the dry-type transformer circuit breaker is thereby advantageously increased.
  • Fig. 3 shows an exemplary third dry-transformer load switch 40 in a sectional view.
  • the rotatable barrier screen two radially adjacent hollow cylinder segment-shaped shielding elements 42, 44, whereby the dielectric strength of the barrier screen is increased in an advantageous manner.
  • Fig. 4 shows an exemplary fourth dry-transformer load switch 50 in a sectional view.
  • radially aligned outer plates 52, 54, 56 are arranged on the inner circumference of the hollow insulating cylinder of the dry-type transformer, which protrude into the interior of the insulating hollow cylinder. Due to a successful rotational movement, which is indicated by the arrow with the reference numeral 58, the third outer fin 56 is just in a collision with the main contact. Since the outer plates are made of elastic silicone rubber in this case, a temporary deformation of the third outer plate 56 occurs due to the collision.

Abstract

Die Erfindung betrifft einen Trockentransformatorlastschalter (10, 30, 40, 50), umfassend einen sich längs um eine virtuelle Mittelachse (12) erstreckenden Isolationshohlzylinder (14) mit mehreren längs dessen inneren Umfangs angeordneten Anschlusskontakten (16, 18, 20), sowie einen im Inneren des Isolationshohlzylinders (14) um die Mittelachse (12) drehbar angeordneten radial ausgerichteten Hauptkontakt (22), welcher mittels einer entsprechenden Drehbewegung wahlweise elektrisch mit seinem radial äußeren Ende (26) mit einem der Anschlusskontakte (16, 18, 20) verbindbar ist. In einem durch radial inneres (24) und äußeres (26) Ende des Hauptkontaktes (22) bestimmten hohlzylindrischen Raum (28) um die Mittelachse (12) ist ein gemeinsam mit dem Hauptkontakt (22) um diese drehbarer Barriereschirm ((32+34+36), (42+44)) vorgesehen. Die Erfindung betrifft auch einen Transformator mit erfindungsgemäßem Trockentransformatorlastschalter (10, 30, 40, 50).The invention relates to a dry - type transformer circuit breaker (10, 30, 40, 50) comprising a hollow insulating cylinder (14) extending longitudinally about a virtual central axis (12) and having a plurality of terminal contacts (16, 18, 20) arranged along its inner circumference, and one in the Inner of the hollow insulating cylinder (14) about the central axis (12) rotatably arranged radially aligned main contact (22) which is selectively electrically connected by means of a corresponding rotational movement with its radially outer end (26) with one of the connection contacts (16, 18, 20). In a hollow cylindrical space (28) about the central axis (12), defined by radially inner (24) and outer (26) ends of the main contact (22), a rotatable barrier screen (32 + 34 + 36), (42 + 44)). The invention also relates to a transformer with a dry-type transformer circuit breaker (10, 30, 40, 50) according to the invention.

Description

Die Erfindung betrifft einen Trockentransformatorlastschalter, umfassend einen sich längs um eine virtuelle Mittelachse erstreckenden Isolationshohlzylinder mit mehreren längs dessen inneren Umfangs angeordneten Anschlusskontakten, sowie einen im Inneren des Isolationshohlzylinders um die Mittelachse drehbar angeordneten radial ausgerichteten Hauptkontakt, welcher mittels einer entsprechenden Drehbewegung wahlweise elektrisch mit seinem radial äußeren Ende mit einem der Anschlusskontakte verbindbar ist.The invention relates to a dry-type transformer circuit breaker, comprising a hollow insulating cylinder extending longitudinally about a virtual central axis with a plurality of arranged along the inner circumference terminal contacts, and a radially aligned inside the insulating hollow cylinder about the central axis radially aligned main contact which selectively by means of a corresponding rotational movement with its radially outer end is connectable to one of the terminal contacts.

Es ist allgemein bekannt, dass Transformatoren in Energieverteilungsnetzen zum Einsatz kommen, um Netzteile verschiedener Spannungsebenen miteinander zu koppeln. In höheren Spannungsebenen wie beispielsweise 110kV / 380kV kommen üblicherweise Öltransformatoren zum Einsatz, bei darunter liegenden Spannungsebenen sind Trockentransformatoren oder gasgefüllte Transformatoren üblich, beispielsweise 30kV, 72,5kV und vereinzelt auch 110kV.It is well known that transformers are used in power distribution networks to couple power supplies of different voltage levels together. In higher voltage levels such as 110kV / 380kV oil transformers are usually used, at underlying voltage levels, dry transformers or gas-filled transformers are common, for example, 30kV, 72.5kV and some even 110kV.

Öltransformatoren weisen häufig sogenannte Lastschalter auf, mittels welcher unter Laststrom zwischen verschiedenen Anzapfungen der Transformatorwicklurig gewechselt werden kann, so dass die Spannung im Netz durch eine Anpassung des Übersetzungsverhältnisses des Transformators in gewissen Grenzen geregelt werden kann. Ein Lastschalter weist typischerweise mehrere längs einer Bahn angeordnete Anschlusskontakte auf, welche mit verschiedenen Anzapfungen einer Transformatorwicklung verbunden sind. Ein Hauptkontakt ist mechanisch längs der Bahn bewegbar und kann dadurch wahlweise mit einer der Anzapfungen verbunden werden. Üblicherweise sind die Anzapfungen längs einer kreisförmigen Bahn angeordnet, so dass durch eine Drehbewegung des Hauptkontaktes eine Kontaktierung der gewünschten Anzapfung erfolgt.Oil transformers often have so-called load switch, by means of which can be changed under load current between different taps of Transformatorwicklurig, so that the voltage in the network can be controlled by adjusting the transmission ratio of the transformer within certain limits. A load switch typically has several along a path arranged Connection contacts, which are connected to different taps of a transformer winding. A main contact is mechanically movable along the track and can thereby be selectively connected to one of the taps. Usually, the taps are arranged along a circular path, so that a contacting of the desired tap takes place by a rotational movement of the main contact.

Bei Öltransformatoren befinden sich derartige Lastschalter in einem ölgefüllten Bereich des Transformatorkessels, welcher aus Verschmutzungsgründen jedoch von dem Bereich, in welchem der Transformator angeordnet ist, getrennt ist. Aufgrund der Anordnung eines solchen Lasttrennschalters im Isolationsmedium Öl lässt sich dieser deutlich kleiner ausgestalten als bei einer Anordnung in Luft.In oil transformers, such circuit breakers are located in an oil-filled area of the transformer tank, which, however, is separated from the area in which the transformer is located for reasons of contamination. Due to the arrangement of such a circuit breaker in the isolation medium oil, this can be designed significantly smaller than in an arrangement in air.

Aus Gründen der verbesserten Regelbarkeit wird aber auch zunehmend für niedrigere Spannungsebenen eine Anpassungsmöglichkeit des Übersetzungsverhältnisses von Trockentransformatoren unter Last gefordert. Bei Trockentransformatoren wird jedoch bewusst auf den Einsatz von Öl verzichtet, was insbesondere bezüglich der Kühlung und der Isolation eine andere Konstruktionsweise erforderlich macht als bei Öltransformatoren.For reasons of improved controllability, however, an adaptation possibility of the transmission ratio of dry-type transformers under load is also increasingly demanded for lower voltage levels. In dry-type transformers, however, the use of oil is deliberately avoided, which necessitates a different design, in particular with regard to cooling and insulation, than with oil transformers.

Als nachteilig erweist sich hierbei bei Trockentransformatorlastschaltern, dass aufgrund des Wegfalls des Isolationsmediums Öl ein deutlich erhöhtes Risiko von elektrischen Überschlägen besteht beziehungsweise dass ein Trockentransformatorlastschalter entsprechend groß auszuführen ist, um ein solches Risiko zu reduzieren.It proves to be disadvantageous here in the case of dry-type transformer circuit breakers that owing to the omission of the insulating medium oil there is a distinctly increased risk of electric flashovers or that a dry-transformer circuit breaker must be correspondingly large in order to reduce such a risk.

Ausgehend von diesem Stand der Technik ist es Aufgabe der Erfindung, einen kompakten Trockentransformatorlastschalter mit verbessertem Isolationsverhalten bereitzustellen. Aufgabe der Erfindung ist auch die Bereitstellung eines entsprechenden Trockentransformators.Based on this prior art, it is an object of the invention to provide a compact dry-type transformer circuit breaker with improved insulation behavior. The object of the invention is also to provide a corresponding dry-type transformer.

Diese Aufgabe wird gelöst durch einen Trockentransformatorlastschalter der eingangs genannten Art. Dieser ist dadurch gekennzeichnet, dass in einem durch radial inneres und äußeres Ende des Hauptkontaktes bestimmten hohlzylindrischen Raum um die Mittelachse ein gemeinsam mit dem Hauptkontakt um diese drehbarer Barriereschirm vorgesehen ist.This object is achieved by a dry-type transformer circuit breaker of the type mentioned in the introduction. This is characterized in that in a hollow-cylindrical space determined by radially inner and outer ends of the main contact about the central axis is provided together with the main contact to this rotatable barrier screen.

Die Grundidee der Erfindung besteht darin, einen zusammen mit dem Hauptkontakt drehbaren Barriereschirm vorzusehen, um so die elektrische Festigkeit zu verbessern. Bei Lasttrennschaltern ist der Raum zwischen den radial außen am lsolationshohlzylinder liegenden Anschlusskontakten und dem Hauptkontakt der isolationskritischste Bereich. Die Anordnung eines festen Barriereschirms ist jedoch nicht möglich, weil dieser hohlzylindrische Raum um die Mittelachse für eine Rundumbewegung des Hauptkontaktes zur Verfügung stehen muss. Durch Einführung eines zusammen mit dem Hauptkontakt drehbaren Barriereschirms lässt sich dieser hohlzylindrische Raum um die Mittelachse sowohl für eine Bewegung des Hauptkontaktes als auch für die Anordnung eines Barriereschirms nutzen. Die Isolationsfestigkeit eines erfindungsgemäßen Trockentransformatorlastschalters ist dadurch in vorteilhafter Weise gesteigert.The basic idea of the invention is to provide a barrier screen rotatable together with the main contact so as to improve the electrical strength. In the case of switch-disconnectors, the space between the connection contacts lying radially on the outside of the insulating hollow cylinder and the main contact is the region which is the most critical to insulation. However, the arrangement of a fixed barrier screen is not possible because this hollow cylindrical space around the central axis for an all-round movement of the main contact must be available. By introducing a barrier screen rotatable together with the main contact, this hollow-cylindrical space around the central axis can be used both for a movement of the main contact and for the arrangement of a barrier screen. The insulation resistance of a dry-type transformer circuit breaker according to the invention is thereby increased in an advantageous manner.

Gemäß einer besonders bevorzugten Ausgestaltungsvariante des erfindungsgemäßen Trockentransformatorlastschalters umfasst der Barriereschirms ein hohlzylinderförmiges beziehungsweise ein hohlzylindersegmentförmiges Schirmelement. Ein hohlzylinderähnliches Schirmelement ist in besonderer Weise geeignet, Teil eines Barriereschirms im ebenfalls hohlzylindrischen Raum um die Mittelachse zu sein. Im Bereich des Hauptkontaktes ist der Barriereschirm vorzugsweise mit einer Aussparung zu versehen, um eine direkte Berührung mit dem spannungsführenden Hauptkontakt zu vermeiden. Eine isolationstechnisch nachteilege Verkürzung des Kriechwegs ist damit ausgeschlossen.According to a particularly preferred embodiment variant of the dry-type transformer circuit breaker according to the invention, the barrier screen comprises a hollow-cylindrical or hollow-cylinder segment-shaped shielding element. A hollow cylinder-like screen element is particularly suitable to be part of a barrier screen in also hollow cylindrical space around the central axis. In the region of the main contact, the barrier screen is preferably provided with a recess in order to avoid direct contact with the live main contact. A isolation-technically disadvantageous shortening of the creepage path is thereby excluded.

Entsprechend einer weiteren Variante des erfindungsgemäßen Trockentransformatorlastschalters umfasst der Barriereschirm wenigstens zwei radial übereinander angeordnete hohlzylinderförmige beziehungsweise hohlzylindersegmentförmige Schirmelemente. Durch eine derartige Doppelwandigkeit wird die Spannungsfestigkeit in vorteilhafter Weise weiter gesteigert.According to a further variant of the dry-type transformer circuit breaker according to the invention, the barrier screen comprises at least two hollow cylindrical or hollow cylinder segment-shaped shielding elements arranged radially one above the other. By such a double wall the dielectric strength is advantageously further increased.

Einer weiteren Erfindungsvariante folgend ist auf wenigstens einem hohtzylinderför migen beziehungsweise hohlzylindersegmentförmigen Schirmelement wenigstens eine radial ausgerichtete Innenlamelle vorgesehen, welche sich vorzugsweise längs der Mittelachse erstreckt. Hierdurch wird die Länge möglicher Kriechwege, deren Verlauf von den jeweils gegebenen Randbedingungen abhängig ist, in vorteilhafter Weise verlängert und die Isolationsfähigkeit des erfindungsgemäßen Trockentransformatorlastschalters weiter gesteigert.According to a further variant of the invention is at least one hohtzylinderför shaped or hollow cylinder segment-shaped screen element at least a radially aligned inner plate is provided, which preferably extends along the central axis. As a result, the length of possible creepage paths, the course of which is dependent on the particular given boundary conditions, extended in an advantageous manner and further increased the isolation capability of the dry-type transformer circuit breaker according to the invention.

Um eine mechanische Kollision einer derartigen Innenlamelle mit einem der typischerweise in den Innenraum hineinragenden Außenkontakte zu vermeiden, ist es für Innenlamellen aus einem festen Werkstoff notwendig, dass diese nicht aus dem hohlzylindrischen Raum um die Mittelachse herausragen.In order to avoid a mechanical collision of such an inner plate with one of the typically projecting into the interior of external contacts, it is necessary for inner plates made of a solid material that they do not protrude from the hollow cylindrical space around the central axis.

Entsprechend einer weiteren Ausgestaltungsform des erfindungsgemäßen Trockentransformatorlastschalters ragt jedoch die wenigstens eine radial ausgerichtete Innenlamelle aus dem hohlzylindrischen Raum um die Drehachse heraus, ist aber aus einem elastischen Material wie beispielsweise Silikongummi gefertigt. Somit erfolgt bei einer Kollision der Lamelle mit einem Anschlusskontakt eine zeitweilige Deformation der Lamelle und eine Drehbewegung des Hauptkontaktes ist dennoch möglich.According to a further embodiment of the dry-type transformer circuit breaker according to the invention, however, the at least one radially aligned inner plate protrudes from the hollow cylindrical space about the axis of rotation, but is made of an elastic material such as silicone rubber. Thus, in a collision of the blade with a terminal contact, a temporary deformation of the blade and a rotational movement of the main contact is still possible.

Gemäß einer alternativen Ausgestaltungsform des erfindungsgemäßen Trockentransformatorlastschalters ragt die wenigstens eine radial ausgerichtete Innenlamelle ebenfalls aus dem hohlzylindrischen Raum um die Drehachse heraus, es sind aber Mittel vorgesehen, die Innenlamelle zumindest für die Dauer einer Drehbewegung des Barriereschirms radial nach innen zu verlagern. Somit ist bei Stillstand des Barriereschirms in vorteilhafter Weise eine Kriechwegverlängerung in Form der ausgefahrenen Lamelle aktiv, wobei dennoch durch Einfahren der Lamelle eine kollisionsfreie Drehbewegung des Hauptkontaktes zusammen mit dem Barriereschirm ermöglicht ist.According to an alternative embodiment of the dry-type transformer circuit breaker according to the invention, the at least one radially aligned inner plate also projects out of the hollow cylindrical space about the axis of rotation, but means are provided for displacing the inner plate radially inwards at least for the duration of a rotational movement of the barrier screen. Thus, at standstill of the barrier screen advantageously a Kriechwegverlängerung in the form of the extended blade is active, yet a collision-free rotational movement of the main contact is made possible together with the barrier screen by retracting the blade.

Einer weiteren Erfindungsvariante entsprechend ist eine radial ausgerichtete Außenlamelle am Innenumfang des Isolationshohlzylinders vorgesehen, welche in dessen Innenraum hineinragt. Hierdurch wird in vorteilhafter Weise der Kriechweg zwischen benachbarten Außenkontakten erhöht und diese können in platzsparender Weise näher aneinander angeordnet werden.According to a further variant of the invention, a radially oriented outer disk is provided on the inner circumference of the hollow insulating cylinder, which protrudes into its inner space. As a result, the creepage distance between adjacent external contacts is advantageously increased and these can be arranged closer together in a space-saving manner.

Insbesondere für den Fall, dass die in den Innenraum hineinragende Außenlamelle auch in den hohlzylindrischen Raum um die Mittelachse hineinragt ist es erfindungsgemäß vorgesehen, dass die wenigstens eine radial ausgerichtete Außenlamelle aus einem elastischen Material gefertigt ist. Hierdurch erfolgt im Falle einer Kollision mit dem Hauptkontakt eine temporäre Deformation der jeweiligen Außenlamelle.In particular, for the case that protrudes into the interior outer plate also projects into the hollow cylindrical space around the central axis, it is inventively provided that the at least one radially oriented outer plate is made of an elastic material. As a result, in the event of a collision with the main contact, a temporary deformation of the respective outer disk takes place.

In entsprechender Weise ist erfindungsgemäß optional auch an der radialen Außenfläche des Isolationshohlzylinders zwischen herausragenden Anschlusskontakten wenigstens eine Lamelle vorgesehen, deren Zweck dem der zuvor genannten nach innen ragenden Außenlamelle entspricht. Bevorzugter Weise sind sowohl auf der innen- als auch auf der Außenseite des Isolationshohlzylinders entsprechende Lamellen vorgesehen.In a corresponding manner, according to the invention, optionally at least one lamella is also provided on the radially outer surface of the insulating hollow cylinder between protruding connecting contacts, the purpose of which corresponds to that of the aforementioned inwardly projecting outer lamella. Preferably, corresponding lamellae are provided both on the inside and on the outside of the insulating hollow cylinder.

Gemäß einer weiteren Ausgestaltungsform des erfindungsgemäßen Trockentransformatorlastschalters ist wenigstens ein radial in den Innenraum des Isolationshohlzylinders hereinragender Anschlusskontakt von einer hohlzylindrischen Barriere umgeben. Somit ist der Kriechweg zu benachbarten Anschlusskontakten abermals in vorteilhafter Weise verlängert.According to a further embodiment of the dry-type transformer circuit breaker according to the invention, at least one terminal contact projecting radially into the interior of the hollow insulating cylinder is surrounded by a hollow cylindrical barrier. Thus, the creepage distance to adjacent terminal contacts is extended again advantageously.

Entsprechend einer weiteren besonders bevorzugten Erfindungsvariante ist der Barriereschirm von um die Mittelachse drehbaren Scheibenelementen gehalten, welche an den axialen Endbereichen des Isolationshohlzylinders vorgesehen sind. Zur Verlängerung möglicher Kriechwege ist erfindungsgemäß ein direkter Kontakt des Barriereschirms mit dem Hauptkontakt zu vermeiden. Mit vorzugsweise im Bereich der axialen Enden des Isolationshohlzylinders vorgesehenen scheibenähnlichen Trägerelementen aus einem Isolationsmaterial lässt sich dies insbesondere für den isolationstechnisch relevanten Bereich im hohlzylindrischen Raum um die Mittelachse erreichen. Die Verbindung eines hohlzylindersegmentähnlichen Segmentes, welches beispielsweise aus einer mit Glasfasern verstärkten Kunststoffplatte gefertigt ist, mit einem Scheibenelement erfolgt beispielsweise mittels einer ringähnlichen Nut, welche in das Scheibenelement eingefräst ist. Eine hinreichende Beabstandung von Isolationshohlzylinder und Scheibenelement beziehungsweise mit diesem verbundenen Barriereschirm ist zu gewährleisten.According to a further particularly preferred variant of the invention, the barrier screen is held by disk elements which are rotatable about the center axis and which are provided at the axial end regions of the hollow insulating cylinder. To extend possible creepage paths according to the invention, direct contact of the barrier screen with the main contact is to be avoided. With preferably provided in the region of the axial ends of the insulating hollow cylinder disc-like support members made of an insulating material, this can be achieved in particular for the isolation technology relevant area in the hollow cylindrical space around the central axis. The connection of a hollow cylinder segment-like segment, which is made for example of a reinforced with glass fibers plastic plate, with a disc element, for example, by means of a ring-like groove, which is milled into the disc element. A sufficient spacing of insulating hollow cylinder and disc element or with this associated barrier screen is to ensure.

Gemäß einer weiteren Variante des erfindungsgemäßen Trockentransformatoriastschalters ist dieser hermetisch gekapselt und mit einem Isolationsgas gefüllt. Ein Isolationsgas wie beispielsweise SF6 erhöht in vorteilhafter Weise die Spannungsfestigkeit.According to a further variant of the dry-type transformer switch according to the invention, the latter is hermetically encapsulated and filled with an insulating gas. An insulating gas such as SF6 advantageously increases the withstand voltage.

Die erfindungsgemäße Aufgabe wird auch gelöst durch einen Trockentransformator, umfassend einen Transformatorkern mit wenigstens einer Wicklung und einem Lastschalter, wobei der Lastschalter ein erfindungsgemäßer Trockentransformatorlastschalter ist. Die erfindungsgemäßen Vorteile einer höheren Isolationsfestigkeit beziehungsweise einer geringeren Baugröße wurden bereits für den Trockentransformatorlastschalter erläutert und sind auch auf einen Trockentransformator mit einem Trockentransformatorlastschalter übertragbar.The object according to the invention is also achieved by a dry-type transformer comprising a transformer core with at least one winding and a load switch, wherein the load switch is a dry-type transformer circuit breaker according to the invention. The advantages according to the invention of a higher insulation strength or a smaller size have already been explained for the dry-type transformer circuit breaker and can also be applied to a dry-type transformer with a dry-type transformer circuit breaker.

Weitere vorteilhafte Ausgestaltungsmöglichkeiten sind den weiteren abhängigen Ansprüchen zu entnehmen.Further advantageous embodiment possibilities can be found in the further dependent claims.

Anhand der in den Zeichnungen dargestellten Ausführungsbeispiele sollen die Erfindung, weitere Ausführungsformen und weitere Vorteile näher beschrieben werden.Reference to the embodiments illustrated in the drawings, the invention, further embodiments and other advantages will be described in detail.

Es zeigen:

Fig. 1
einen exemplarischen ersten Trockentransformatarlastschalter,
Fig. 2
einen exemplarischen zweiten Trockentransformatorlastschalter,
Fig. 3
einen exemplarischen dritten Trockentransformatorlastschalter sowie
Fig. 4
einen exemplarischen vierten Trockentransformatorlastschalter.
Show it:
Fig. 1
an exemplary first dry-transformation circuit breaker,
Fig. 2
an exemplary second dry-transformer circuit breaker,
Fig. 3
an exemplary third dry-type transformer circuit breaker as well
Fig. 4
an exemplary fourth dry-transformer load switch.

Fig. 1 zeigt einen exemplarischen ersten Trockentransformatorlastschalter 10 in einer Schnittdarstellung. Um eine virtuelle Mittelachse 12 herum ist ein rohrähnlicher isolationshohlzylinder 14 aus einem isolierenden Material, beispielsweise aus einem Glasfaser-/Epoxidharz Verbundwerkstoff angeordnet. Durch die Wandungen des Isolationshohlzylinders 14 sind in einer gemeinsamen Ebene senkrecht zur Mittelachse 12 mehrere Anschlusskontakte 14, 16, 18 in dessen Inneres geführt, in welches sie hereinragen. Fig. 1 shows an exemplary first dry-transformer load switch 10 in a sectional view. Around a virtual central axis 12 around a tube-like insulating hollow cylinder 14 of an insulating material, for example, a glass fiber / epoxy resin composite material is arranged. Through the walls of the hollow insulating cylinder 14 a plurality of terminal contacts 14, 16, 18 are guided in its interior in a common plane perpendicular to the central axis 12, in which they protrude.

Ein hohlzylindrischer Drehkörper 27 mit einem von dessen Außenfläche radial abgehendem Hauptkontakt 22 ist drehbar ebenfalls um die Mittelachse 12 angeordnet. Durch eine entsprechende Drehbewegung ist das radial äußere Ende 26 des Haupt-kontaktes 22 wahlweise mit einem der Anschlusskontakte 14, 16, 18 verbindbar. Durch das radial innere 24 und äußere 26 Ende des Hauptkontaktes 22 ist ein hohlzylindrischer Raum 28 um die Mittelachse 12 gebildet, welchen der Hauptkontakt bei einer Drehbewegung überstreicht.A hollow-cylindrical rotary body 27 with a main contact 22 radially outgoing from its outer surface is also rotatably arranged around the central axis 12. By a corresponding rotational movement, the radially outer end 26 of the main contact 22 is selectively connectable to one of the terminal contacts 14, 16, 18. By the radially inner 24 and outer 26 end of the main contact 22, a hollow cylindrical space 28 is formed around the central axis 12, which sweeps over the main contact in a rotary motion.

Fig. 2 zeigt einen exemplarischen zweiten Trockentransformatorlastschalter 30 in einer Schnittdarstellung. Dieser ähnelt dem zuvor in der Fig. 1 gezeigten Trockentransformatorlastschalter, jedoch sind in diesem Beispiel ein zusammen mit dem Hauptkontakt drehbarer Barriereschirm mit einem hohlzylindersegmentförmigen Schirmelement 32 und damit verbundenen radial ausgerichteten Innenlamellen 34, 36 gezeigt. Die elektrische Isolationsfähigkeit des Trockentransformatorlastschalters wird dadurch in vorteilhafter Weise erhöht. Fig. 2 shows an exemplary second dry-transformer load switch 30 in a sectional view. This is similar to the previously in the Fig. 1 shown dry-type transformer circuit breaker, however, in this example, a rotatable together with the main contact barrier screen with a hollow cylinder segment-shaped shield member 32 and associated radially aligned inner fins 34, 36 are shown. The electrical insulation capability of the dry-type transformer circuit breaker is thereby advantageously increased.

Fig. 3 zeigt einen exemplarischen dritten Trockentransformatorlastschalter 40 in einer Schnittdarstellung. Hier weist der drehbare Barriereschirm zwei radial benachbarte hohlzylindersegmentförmige Schirmelemente 42, 44 auf, wodurch die Durchschlagsfestigkeit des Barriereschirms in vorteilhafter Weise erhöht ist. Fig. 3 shows an exemplary third dry-transformer load switch 40 in a sectional view. Here, the rotatable barrier screen two radially adjacent hollow cylinder segment-shaped shielding elements 42, 44, whereby the dielectric strength of the barrier screen is increased in an advantageous manner.

Fig. 4 zeigt einen exemplarischen vierten Trockentransformatorlastschalter 50 in einer Schnittdarstellung. Abweichend zu den vorherigen Figuren sind am Innenumfang des Isolationshohlzylinders des Trockentransformatorlastschalters radial ausgerichtete Außenlamellen 52, 54, 56 angeordnet, welche in den Innenraum des Isolationshohlzylinders ragen. Aufgrund einer erfolgenden Drehbewegung, welche mit dem Pfeil mit der Bezugsziffer 58 angedeutet ist, ist die dritte Außenlamelle 56 gerade in einer Kollision mit dem Hauptkontakt. Da die Außenlamellen in diesem Fall aus elastischem Silikongummi gefertigt sind, erfolgt kollisionsbedingt eine temporäre Deformation der dritten Außenlamelle 56. Fig. 4 shows an exemplary fourth dry-transformer load switch 50 in a sectional view. Notwithstanding the previous figures radially aligned outer plates 52, 54, 56 are arranged on the inner circumference of the hollow insulating cylinder of the dry-type transformer, which protrude into the interior of the insulating hollow cylinder. Due to a successful rotational movement, which is indicated by the arrow with the reference numeral 58, the third outer fin 56 is just in a collision with the main contact. Since the outer plates are made of elastic silicone rubber in this case, a temporary deformation of the third outer plate 56 occurs due to the collision.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
exemplarischer erster Trockentransformatorlastschalterexemplary first dry-transformer circuit breaker
1212
virtuelle Mittelachsevirtual central axis
1414
IsolationshohlzylinderInsulating hollow cylinder
1616
erster Anschlusskontaktfirst connection contact
1818
zweiter Anschlusskontaktsecond connection contact
2020
dritter Anschlusskontaktthird connection contact
2222
Hauptkontaktmain contact
2424
radial inneres Ende des Hauptkontaktesradially inner end of the main contact
2626
radial äußeres Ende des Hauptkontaktesradially outer end of the main contact
2727
Drehkörperrotating body
2828
hohlzylindrischer Raum um die Mittelachsehollow cylindrical space around the central axis
3030
exemplarischer zweiter Trockentransformatorlastschalterexemplary second dry-transformer circuit breaker
3232
hohlzylindersegmentförmiges Schirmelementhollow cylinder segment-shaped screen element
3434
erste radial ausgerichtete Innenlamellefirst radially aligned inner plate
3636
zweite radial ausgerichtete Innenlamellesecond radially aligned inner plate
4040
exemplarischer dritter Trockentransformatorlastschalterexemplary third dry-transformer circuit breaker
4242
radial inneres hohlzylindersegmentförmiges Schirmelementradially inner hollow cylinder segment-shaped shield element
4444
radial äußeres hohlzylindersegmentförmiges Schirmelementradially outer hollow cylinder segment-shaped shield element
5050
exemplarischer vierter Trockentransformatorlastschalterexemplary fourth dry-transformer circuit breaker
5252
erste radial ausgerichtete Außenlamellefirst radially aligned outer plate
5454
zweite radial ausgerichtete Außenlamellesecond radially oriented outer disk
5656
dritte radial ausgerichtete Außenlamelle in gebogenem Zustandthird radially oriented outer plate in the bent state
5858
Drehrichtungdirection of rotation

Claims (13)

Trockentransformatorlastschalter (10, 30, 40, 50), umfassend • einen sich längs um eine virtuelle Mittelachse (12) erstreckenden Isolationshohlzylinder (14) mit mehreren längs dessen inneren Umfangs angeordneten Anschlusskontakten (16, 18, 20), sowie • einen im Inneren des Isolationshohlzylinders (14) um die Mittelachse (12) drehbar angeordneten radial ausgerichteten Hauptkontakt (22), welcher mittels einer entsprechenden Drehbewegung wahlweise elektrisch mit seinem radial äußeren Ende (26) mit einem der Anschlusskontakte (16, 18, 20) verbindbar ist, dadurch gekennzeichnet,
dass in einem durch radial inneres (24) und äußeres (26) Ende des Hauptkontaktes (22) bestimmten hohlzylindrischen Raum (28) um die Mittelachse (12) ein gemeinsam mit dem Hauptkontakt (22) um diese drehbarer Barriereschirm ((32+34+36), (42+44)) vorgesehen ist.Dry transformer load switch (10, 30, 40, 50) comprising • A longitudinally extending about a virtual central axis (12) insulating hollow cylinder (14) having a plurality of along its inner circumference arranged terminal contacts (16, 18, 20), and A radially oriented main contact (22) which is rotatably arranged in the interior of the insulating hollow cylinder (14) about the central axis (12) and which by means of a corresponding rotational movement optionally electrically with its radially outer end (26) with one of the connection contacts (16, 18, 20) is connectable, characterized,
in that a hollow-cylindrical space (28), which is defined by radially inner (24) and outer (26) ends of the main contact (22) about the central axis (12), forms a rotatable barrier screen (32 + 34 + 36), (42 + 44)) is provided. Trockentransformatorlastschalter nach Anspruch 1, dadurch gekennzeichnet, dass der Barriereschirm ((32+34+36), (42+44)) ein hohlzylinderförmiges beziehungsweise ein hohlzylindersegmentförmiges (32, 42, 44) Schirmelement umfasst.Dry transformer load switch according to claim 1, characterized in that the barrier screen ((32 + 34 + 36), (42 + 44)) comprises a hollow cylindrical or a hollow cylinder segment-shaped (32, 42, 44) screen element. Trockentransformatorlastschalter nach Anspruch 2, dadurch gekennzeichnet, dass der Barriereschirm ((32+34+36), (42+44)) wenigstens zwei radial übereinander angeordnete hohlzylinderförmige beziehungsweise hohlzylindersegmentförmige (32, 42, 44) Schirmelemente umfasst.Dry transformer load switch according to claim 2, characterized in that the barrier screen ((32 + 34 + 36), (42 + 44)) comprises at least two radially superposed hollow cylindrical or hollow cylinder segment-shaped (32, 42, 44) screen elements. Trockentransformatorlastschalter nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass auf wenigstens einem hohlzylinderförmigen beziehungsweise hohlzylindersegmentförmigen (32, 42, 44) Schirmelement wenigstens eine radial ausgerichtete Innenlamelle (34, 36) vorgesehen ist.Dry transformer load switch according to claim 2 or 3, characterized in that on at least one hollow cylindrical or hollow cylinder segment-shaped (32, 42, 44) screen element at least one radially aligned inner plate (34, 36) is provided. Trockentransformatorlastschalter nach Anspruch 4, dadurch gekennzeichnet, dass die wenigstens eine radial ausgerichtete Innenlamelle (34, 36) aus dem hohlzylindrischen Raum (28) um die Drehachse (12) herausragt und aus einem elastischen Material gefertigt ist.Dry transformer load switch according to claim 4, characterized in that the at least one radially aligned inner plate (34, 36) protrudes from the hollow cylindrical space (28) about the axis of rotation (12) and is made of an elastic material. Trockentransformatorlastschalter nach Anspruch 4, dadurch gekennzeichnet, dass die wenigstens eine radial ausgerichtete Innenlamelle (34, 36) aus dem hohlzylindrischen Raum (28) um die Drehachse (12) herausragt und Mittel vorgesehen sind, die Innenlamelle (34, 36) zumindest für die Dauer einer Drehbewegung des Barriereschirms radial nach innen zu verlagern.Dry transformer load switch according to claim 4, characterized in that the at least one radially aligned inner plate (34, 36) protrudes from the hollow cylindrical space (28) about the axis of rotation (12) and means are provided, the inner plate (34, 36) at least for the duration a rotational movement of the barrier screen to move radially inward. Trockentransformatorlastschalter nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass wenigstens eine radial ausgerichtete Außenlamelle (52, 54, 56) am Innenumfang des Isolationshohlzylinders (14) vorgesehen ist, welche in dessen Innenraum hineinragt.Dry transformer load switch according to one of the preceding claims, characterized in that at least one radially aligned outer plate (52, 54, 56) on the inner circumference of the hollow insulating cylinder (14) is provided, which projects into the interior thereof. Trockentransformatorlastschalter nach Anspruch 7, dadurch gekennzeichnet, dass die wenigstens eine radial ausgerichtete Außenlamellen (52, 54, 56) aus einem elastischen Material gefertigt ist.Dry transformer load switch according to claim 7, characterized in that the at least one radially aligned outer disk (52, 54, 56) is made of an elastic material. Trockentransformatorlastschalter nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass wenigstens an der radialen Außenfläche des Isolationshohlzylinders (14) zwischen herausragenden Anschlusskontakten (16, 18, 20) eine Lamelle vorgesehen ist.Dry transformer load switch according to one of the preceding claims, characterized in that at least on the radial outer surface of the hollow insulating cylinder (14) between protruding connection contacts (16, 18, 20) is provided a lamella. Trockentransformatorlastschalter nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass wenigstens ein radial in den Innenraum des Isolationshohlzylinders (14) hereinragender Anschlusskontakt (16, 18, 20) von einer hohlzylindrischen Barriere umgeben ist.Dry-transformer load switch according to one of the preceding claims, characterized in that at least one radially in the interior of the hollow insulating cylinder (14) protruding terminal contact (16, 18, 20) is surrounded by a hollow cylindrical barrier. Trockentransformatorlastschalter nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Barriereschirm ((32+34+36), (42+44)) von um die Mittelachse drehbaren (12) Scheibenelementen gehalten ist, weiche an den axialen Enden des Isolationshohlzylinders (14) vorgesehen sind.A dry-type transformer circuit breaker according to one of the preceding claims, characterized in that the barrier screen ((32 + 34 + 36), (42 + 44)) is held by (12) disk elements which are rotatable about the central axis and soft at the axial ends of the hollow insulating cylinder (14). are provided. Trockentransformatorlastschalter nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass dieser hermetisch gekapselt und mit einem Isolationsgas gefüllt ist.Dry-transformer load switch according to one of the preceding claims, characterized in that it is hermetically encapsulated and filled with an insulating gas. Trockentransformator, umfassend einen Transformatorkern mit wenigstens einer Wicklung und einem Lastschalter,
dadurch gekennzeichnet,
dass der Lastschalter ein Trockentransformatorlastschalter (10, 30, 40, 50) nach einem der Ansprüche 1 bis 12 ist.A dry type transformer comprising a transformer core having at least one winding and a load switch,
characterized,
in that the load switch is a dry-transformer load switch (10, 30, 40, 50) according to one of Claims 1 to 12.
EP14001201.4A 2014-03-31 2014-03-31 Dry transformer load switch Active EP2927923B1 (en)

Priority Applications (4)

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EP14001201.4A EP2927923B1 (en) 2014-03-31 2014-03-31 Dry transformer load switch
PCT/EP2015/054335 WO2015150005A1 (en) 2014-03-31 2015-03-03 Dry transformer load switch
CN201580017665.6A CN106463287B (en) 2014-03-31 2015-03-03 Dry-type transformer load switch
US15/281,113 US10134535B2 (en) 2014-03-31 2016-09-30 Dry transformer load switch

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DE102018203425A1 (en) * 2018-03-07 2019-09-12 Siemens Aktiengesellschaft Device for shielding a power semiconductor in a boiler filled with an insulating fluid

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WO2015150005A1 (en) 2015-10-08
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US10134535B2 (en) 2018-11-20
EP2927923B1 (en) 2017-01-04
US20170018376A1 (en) 2017-01-19

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