EP2869313A1 - Dry transformer coil and dry transformer - Google Patents

Dry transformer coil and dry transformer Download PDF

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Publication number
EP2869313A1
EP2869313A1 EP20130005136 EP13005136A EP2869313A1 EP 2869313 A1 EP2869313 A1 EP 2869313A1 EP 20130005136 EP20130005136 EP 20130005136 EP 13005136 A EP13005136 A EP 13005136A EP 2869313 A1 EP2869313 A1 EP 2869313A1
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EP
European Patent Office
Prior art keywords
dry
coil
transformer
type transformer
radially
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Granted
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EP20130005136
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German (de)
French (fr)
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EP2869313B1 (en
Inventor
Martin Carlen
Benjamin Weber
Jens Tepper
Frank Cornelius
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ABB Schweiz AG
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ABB Technology AG
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Priority to ES13005136.0T priority Critical patent/ES2639111T3/en
Priority to EP13005136.0A priority patent/EP2869313B1/en
Priority to PCT/EP2014/071714 priority patent/WO2015062838A1/en
Publication of EP2869313A1 publication Critical patent/EP2869313A1/en
Application granted granted Critical
Publication of EP2869313B1 publication Critical patent/EP2869313B1/en
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    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/38—Auxiliary core members; Auxiliary coils or windings
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/12—Two-phase, three-phase or polyphase transformers

Definitions

  • the invention relates to a dry-type transformer coil comprising a hollow-cylindrical coil with at least one radially inner and one radially outer winding.
  • the invention also relates to a dry type transformer comprising a transformer core having at least two core legs.
  • dry-type transformers for example in the rated voltage range of 6 kV, 10 kV, 20 kV, 30 kV, do without a special insulation medium such as oil.
  • a special insulation medium such as oil.
  • their construction can be simplified on the one hand in an advantageous manner.
  • the use of air as an insulating medium due to their limited isolation ability increased insulation distances to live components.
  • appropriate coolant for removing the heat loss occurring during operation of the dry transformer are provided, for example, axially extending cooling channels, which are usually arranged between radially adjacent winding segments.
  • a dry-type transformer coil of the aforementioned type is characterized in that on the radially outer surface of the coil an at least partially encircling barrier structure extending at least over its axial length with at least one layer of strips of an insulating material and at least one is provided radially from this supported barrier wall, wherein the radially outermost barrier wall has an electrical screen.
  • the basic idea of the invention is to realize the contact protection of a dry-type transformer coil in that its outer surface is provided with a barrier structure at least on the manually achievable surface areas, which is designed such that the stress load occurring during operation is maintained.
  • a barrier structure at least on the manually achievable surface areas, which is designed such that the stress load occurring during operation is maintained.
  • the structure of the barrier structure of insulating strips and the protective wall carried therefrom is similar to the construction of a cooling channel typically arranged between radially adjacent winding segments of a dry transformer coil and thus particularly easy to integrate into the radial outer surface of the dry transformer coil.
  • strip material for example, glass fiber reinforced strips of a composite material are suitable, which are ideally arranged along the axial extent of the coil on the radially outer surface.
  • the thereby radially supported barrier wall can, for example, shell-like segments a cylinder made of an insulating material, this simplifies the production in a special way.
  • it is also optionally provided according to the invention at least partially produce the radially supported barrier wall of a wound strip material such as a resin impregnated fiber roving or to fix the optionally present shell-like segments radially outward therewith.
  • Such resin-impregnated fiber rovings which are also known under the name "prepreg” in a dry intermediate state of the resin, are heated to a polymerization temperature after the actual winding process and form a mechanically very strong structure during the cooling process.
  • prepreg axially extending channel-like cavities are formed by the barrier structure, which can be used in an advantageous manner as cooling channels.
  • the electric screen is designed as a metallic shield or as a metallization.
  • a metallic shield for example, the radial outer surface or inner surface of the barrier structure is provided with a conductive sheet or a conductive foil, but it is also possible in principle to wrap such a metallic shield directly into the radially supported barrier wall, for example when using fiber rovings. This advantageously increases the mechanical stability of the dry-type transformer coil according to the invention.
  • a metal layer is applied to the actually electrically insulating radially supported barrier wall, for example by vapor deposition or else the application of a metallically conductive lacquer material.
  • the barrier structure encloses the coil in its entirety.
  • the touching of the entire radial outer surface of the dry transformer coil allows safe. This is especially true of Advantage, if there is no built-around the coil structure of a transformer, which is a contact protection for a portion of the coil surface.
  • the terminals of the radially outer winding are guided on the face side out of the coil. As a result, the integrity of the electrical screen is not compromised.
  • the object according to the invention is also achieved by a dry-type transformer comprising a transformer core with at least two core limbs, wherein a dry-type transformer coil according to the invention is arranged around at least one of the at least two core limbs and wherein their respective electrical shield is connected to ground potential.
  • a dry-type transformer coil according to the invention is arranged around at least one of the at least two core limbs and wherein their respective electrical shield is connected to ground potential.
  • the wall of a housing without additional isolation distance can be built up directly to the radial outer surface of a respective dry-type transformer coil.
  • the dry-type transformer has mechanical components which are earthed and which also constitute a mechanical contact protection for the surface regions of a respective dry-type transformer coil
  • a corresponding barrier structure can in principle also be dispensed with in these surface regions.
  • the electrical screens are designed and electrically connected to one another in such a way that the at least two adjacent dry-type transformer coils are enveloped by the connected screen. As a result, all manually reachable areas of the coil surfaces can be touched without risk.
  • Fig. 1 shows an exemplary inventive dry-type transformer coil 10 in a plan view.
  • the dry-transformer coil 10 comprises a hollow-cylindrical radially inner winding 12 and an adjoining radially outer winding 14, which are nested one inside the other.
  • a barrier structure is arranged completely around the radially outer surface of the coil formed by the windings 12, 14.
  • the barrier structure has a plurality of star-like around the central axis of the coil and along its axial extent extending strips 16, through which a ring-like arranged around this barrier wall 18 is radially supported.
  • the axial length of the barrier wall 18 slightly exceeds the axial length the coil, in order to increase the frontal protection against contact.
  • an electrical shield 20 is metallized, which is connected to ground potential 24.
  • the hollow cylindrical dry-type transformer coil is arranged around a core leg 26 of a transformer core.
  • Fig. 2 shows a first exemplary dry-type transformer 30 in a sectional view.
  • a dry-type transformer coil 32, 34, 36 To three parallel arranged in a common plane core leg of a three-limbed transformer core each have a dry-type transformer coil 32, 34, 36 is arranged.
  • Each dry-transformer coil 32, 34, 36 has a barrier structure with an electric screen, which is not completely formed around the respective dry-transformer coil, but is interrupted in partial regions of mutually facing coil surfaces of adjacent dry-type transformer coils.
  • the electrical shields respectively integrated in the barrier structures are mechanically and electrically connected together to form a grounded shield 44, which surrounds the three dry transformer coils 32, 34, 36 and ensures safe contact with the accessible surface areas of the dry transformer coils 32, 34, 36 is.
  • Fig. 3 shows a second exemplary dry-type transformer 50 in a sectional view. This corresponds essentially to that in the FIG. 2 Dry transformer 30 shown around three parallel in a common plane core leg of a three-leg transformer core, a respective dry-type transformer coil 52, 54, 56 is arranged.
  • Each dry-transformer coil 52, 54, 56 has a separately grounded 64 electric screen 58, 60, 62, which is not fully pronounced around the respective dry-transformer coil, but is interrupted in some areas. Since the electrical screens are not mechanically connected to each other, theoretically contacting of mutually facing coil surfaces of adjacent dry-transformer coils 52, 54, 56 is possible, but unintentional contact is precluded due to the difficult accessibility of the respective surface areas.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

Die Erfindung betrifft eine Trockentransformatorspule (10, 32, 34, 36, 52, 54, 56), umfassend eine hohlzylindrische Spule mit wenigstens einer radial innen (12) liegenden und einer radial außen (14) liegenden Wicklung. An der radial äußeren Oberfläche der Spule ist eine zumindest teilweise umlaufende und sich wenigstens über deren axiale Länge erstreckende Barrierenstruktur mit wenigstens einer Lage Leisten (16) aus einem isolierenden Material und wenigstens einer radial von diesen abgestützten Barrierewandung (18) vorgesehen, wobei die radial äußerste Barrierewandung (18) einen elektrischen Schirm (20, 42, 58, 60, 62) aufweist. Die Erfindung betrifft auch einen Trockentransformator, umfassend einen Transformatorkern mit wenigstens zwei Kernschenkeln, wobei um jeden der wenigstens zwei Kernschenkel (26) eine erfindungsgemäße Trockentransformatorspule (10, 32, 34, 36, 52, 54, 56) angeordnet, deren jeweiliger elektrischer Schirm (20, 42, 58, 60, 62) mit Erdpotential (24, 44, 64) verbunden ist.The invention relates to a dry-type transformer coil (10, 32, 34, 36, 52, 54, 56) comprising a hollow-cylindrical coil with at least one radially inner (12) lying and a radially outer (14) lying winding. On the radially outer surface of the coil is at least partially encircling and at least over the axial length extending barrier structure with at least one layer of strips (16) of an insulating material and at least one radially supported by these barrier wall (18), wherein the radially outermost Barrier wall (18) has an electrical screen (20, 42, 58, 60, 62). The invention also relates to a dry-type transformer comprising a transformer core having at least two core legs, a dry-type transformer coil (10, 32, 34, 36, 52, 54, 56) being arranged around each of the at least two core legs (26), the respective electrical screen ( 20, 42, 58, 60, 62) is connected to ground potential (24, 44, 64).

Description

Die Erfindung betrifft eine Trockentransformatorspule, umfassend eine hohlzylindrische Spule mit wenigstens einer radial innen liegenden und einer radial außen liegenden Wicklung. Die Erfindung betrifft auch einen Trockentransformator, umfassend einen Transformatorkern mit wenigstens zwei Kernschenkeln.The invention relates to a dry-type transformer coil comprising a hollow-cylindrical coil with at least one radially inner and one radially outer winding. The invention also relates to a dry type transformer comprising a transformer core having at least two core legs.

Es ist allgemein bekannt, dass Trockentransformatoren, beispielsweise im Nennspannungsbereich von 6kV, 10kV, 20kV, 30kV, ohne ein spezielles Isolationsmedium wie beispielsweise Öl auskommen. Hierdurch lässt sich deren Konstruktion auf der einen Seite in vorteilhafter Weise vereinfachen. Auf der anderen Seite bedingt die Verwendung von Luft als Isolationsmedium aufgrund von deren begrenzter Isolationsfähigkeit vergrößerte Isolationsabstände zu spannungsführenden Bauteilen. Darüber hinaus sind auch entsprechende Kühlmittel zum Abtransport der im Betrieb auftretenden Verlustwärme des Trockentransformators vorzusehen, beispielsweise axial verlaufende Kühlkanäle, welche üblicher Weise zwischen radial benachbarten Wicklungssegmenten angeordnet sind.It is generally known that dry-type transformers, for example in the rated voltage range of 6 kV, 10 kV, 20 kV, 30 kV, do without a special insulation medium such as oil. As a result, their construction can be simplified on the one hand in an advantageous manner. On the other hand, the use of air as an insulating medium due to their limited isolation ability increased insulation distances to live components. In addition, appropriate coolant for removing the heat loss occurring during operation of the dry transformer are provided, for example, axially extending cooling channels, which are usually arranged between radially adjacent winding segments.

Ein inhärenter Berührungsschutz eines Trockentransformators, wie beispielsweise bei der Anordnung eines Transformators in einem mit Öl gefüllten Kessel, ist nicht gegeben. Als nachteilig erweist sich hierbei, dass dies zu einer Gefährdung des Bedien- und Wartungspersonals führt, weil spannungsführende Komponenten aufgrund von Nachlässigkeit unbeabsichtigt berührt werden könnten. Eine bekannte Anordnung eines Transformators in einem geerdeten Gehäuse stellt zwar einerseits einen wirksamen Berührungsschutz dar, führt aber andererseits zu einer nachteilig erhöhten Baugröße des Transformators mit Gehäuse, weil selbstverständlich auch alle benötigten dielektrischen Abstände zwischen den spannungsführenden Komponenten des Transformators und dem geerdeten Gehäuse einzuhalten sind.An inherent protection against contact of a dry transformer, such as in the arrangement of a transformer in an oil-filled boiler, is not given. A disadvantage here proves that this leads to a threat to the operating and maintenance personnel, because live components could be touched accidentally due to negligence. Although a known arrangement of a transformer in a grounded housing on the one hand effective contact protection, but on the other hand leads to a disadvantageously increased size of the transformer housing, because of course, all the required dielectric distances between the live components of the transformer and the grounded housing must be adhered to.

Ausgehend von diesem Stand der Technik ist es Aufgabe der Erfindung, eine Trockentransformatorspule und einen Trockentransformator mit verbessertem Berührungsschutz anzugeben.Based on this prior art, it is an object of the invention to provide a dry-type transformer coil and a dry-type transformer with improved contact protection.

Diese Aufgabe wird gelöst von einer Trockentransformatorspule der eingangs genannten Art. Diese ist dadurch gekennzeichnet, dass an der radial äußeren Oberfläche der Spule eine zumindest teilweise umlaufende und sich wenigstens über deren axiale Länge erstreckende Barrierenstruktur mit wenigstens einer Lage Leisten aus einem isolierenden Material und wenigstens einer radial von diesen abgestützten Barrierewandung vorgesehen ist, wobei die radial äußerste Barrierewandung einen elektrischen Schirm aufweist.This object is achieved by a dry-type transformer coil of the aforementioned type. This is characterized in that on the radially outer surface of the coil an at least partially encircling barrier structure extending at least over its axial length with at least one layer of strips of an insulating material and at least one is provided radially from this supported barrier wall, wherein the radially outermost barrier wall has an electrical screen.

Die Grundidee der Erfindung besteht darin, den Berührungsschutz einer Trockentransformatorspule dadurch zu realisieren, dass deren äußere Oberfläche zumindest an den manuell erreichbaren Oberflächenbereichen mit einer Barrierenstruktur versehen wird, welche derart ausgelegt ist, dass die im Betrieb auftretende Spannungsbelastung gehalten ist. Somit ist es ermöglicht, die radial äußerste Barrierenwandung mit einem geerdeten elektrisch leitfähigen Schirm zu versehen, der gefahrlos von einer ebenfalls auf Erdpotential befindlichen Person berührt werden kann. Der Aufbau der Barrierenstruktur aus isolierenden Leisten und davon getragener Schutzwandung ist dem Aufbau eines typischerweise zwischen radial benachbarten Wicklungssegmenten einer Trockentransformatorspule angeordneten Kühlkanals ähnlich und damit besonders einfach auch in die radiale Außenfläche der Trockentransformatorspule zu integrieren.The basic idea of the invention is to realize the contact protection of a dry-type transformer coil in that its outer surface is provided with a barrier structure at least on the manually achievable surface areas, which is designed such that the stress load occurring during operation is maintained. Thus, it is possible to provide the radially outermost barriers wall with a grounded electrically conductive screen that can be safely touched by a person also at ground potential person. The structure of the barrier structure of insulating strips and the protective wall carried therefrom is similar to the construction of a cooling channel typically arranged between radially adjacent winding segments of a dry transformer coil and thus particularly easy to integrate into the radial outer surface of the dry transformer coil.

Als Leistenmaterial sind beispielsweise glasfaserverstärkte Leisten aus einem Verbundwerkstoff geeignet, welche idealerweise längs der axialen Erstreckung der Spule auf deren radial äußeren Oberfläche angeordnet sind. Die dadurch radial abgestützte Barrierenwandung kann beispielsweise aus schalenähnlichen Segmenten eines Zylinders aus einem Isolationsmaterial gefertigt sein, dies vereinfacht die Herstellung in besonderer Weise. Es ist aber auch erfindungsgemäß optional vorgesehen, die radial abgestützte Barrierenwandung zumindest teilweise aus einem gewickelten Bandmaterial wie einem mit Harz imprägniertem Faserroving herzustellen oder auch die gegebenenfalls vorhandenen schalenähnlichen Segmente radial außen damit zu fixieren. Derartige harzgetränkte Faserrovings, welche in einem trockenen Zwischenzustand des Harzes auch unter dem Namen "Prepreg" bekannt sind, werden nach dem eigentlichen Wickelvorgang auf eine Polymerisationstemperatur erhitzt und bilden beim Abkühlvorgang eine mechanisch sehr feste Struktur. Typischerweise sind durch die Barrierenstruktur axial verlaufende kanalähnliche Hohlräume gebildet, welche in vorteilhafter Weise auch als Kühlkanäle nutzbar sind.As strip material, for example, glass fiber reinforced strips of a composite material are suitable, which are ideally arranged along the axial extent of the coil on the radially outer surface. The thereby radially supported barrier wall can, for example, shell-like segments a cylinder made of an insulating material, this simplifies the production in a special way. However, it is also optionally provided according to the invention, at least partially produce the radially supported barrier wall of a wound strip material such as a resin impregnated fiber roving or to fix the optionally present shell-like segments radially outward therewith. Such resin-impregnated fiber rovings, which are also known under the name "prepreg" in a dry intermediate state of the resin, are heated to a polymerization temperature after the actual winding process and form a mechanically very strong structure during the cooling process. Typically, axially extending channel-like cavities are formed by the barrier structure, which can be used in an advantageous manner as cooling channels.

Gemäß einer weiteren Ausgestaltungsform der erfindungsgemäßen Trockentransformatorspule ist der elektrische Schirm als metallischer Schirm oder als Metallisierung ausgeführt. Im Falle eines metallischen Schirms ist beispielsweise die radiale Außenfläche oder Innenfläche der Barrierenstruktur mit einem leitfähigen Blech oder einer leitfähigen Folie versehen, es ist aber prinzipiell auch möglich, einen derartigen metallischen Schirm direkt in die radial abgestützte Barrierenwandung mit einzuwickeln, beispielsweise bei Verwendung von Faserrovings. Dies erhöht in vorteilhafter Weise die mechanische Stabilität der erfindungsgemäßen Trockentransformatorspule.According to a further embodiment of the dry-type transformer coil according to the invention, the electric screen is designed as a metallic shield or as a metallization. In the case of a metallic shield, for example, the radial outer surface or inner surface of the barrier structure is provided with a conductive sheet or a conductive foil, but it is also possible in principle to wrap such a metallic shield directly into the radially supported barrier wall, for example when using fiber rovings. This advantageously increases the mechanical stability of the dry-type transformer coil according to the invention.

Im Falle einer Metallisierung wird auf die eigentlich elektrisch isolierende radial abgestützte Barrierenwandung eine Metallschicht aufgetragen, beispielsweise durch Aufdampfung oder auch das Auftragen eines metallisch leitfähigen Lackmaterials.In the case of a metallization, a metal layer is applied to the actually electrically insulating radially supported barrier wall, for example by vapor deposition or else the application of a metallically conductive lacquer material.

Einer weiteren Variante der erfindungsgemäßen Trockentransformatorspule folgend ragen zumindest Teile der Barrierenstruktur über die axialen Enden der hohlzylindrischen Spule heraus. Hierdurch ist in vorteilhafter Weise ein zusätzlicher Berührungsschutz der Trockentransformatorspule auch in ihren Stirnbereichen erreicht.Following a further variant of the dry-type transformer coil according to the invention, at least parts of the barrier structure project beyond the axial ends of the hollow-cylindrical coil. As a result, an additional protection against contact of the dry transformer coil is achieved in their forehead areas in an advantageous manner.

Gemäß einer bevorzugten Erfindungsvariante umschließt die Barrierenstruktur die Spule vollumfänglich. Hierdurch das Berühren der gesamten radialen Außenfläche der Trockentransformatorspule gefahrlos ermöglicht. Dies ist insbesondere dann von Vorteil, wenn keine um die Spule verbaute Struktur eines Transformators vorhanden ist, welche für einen Teilbereich der Spulenoberfläche einen Berührungsschutz darstellt.According to a preferred variant of the invention, the barrier structure encloses the coil in its entirety. As a result, the touching of the entire radial outer surface of the dry transformer coil allows safe. This is especially true of Advantage, if there is no built-around the coil structure of a transformer, which is a contact protection for a portion of the coil surface.

Gemäß einer weiteren Variante der erfindungsgemäßen Trockentransformatorspule sind die Anschlüsse der radial äußeren Wicklung stirnseitig aus der Spule geführt. Hierdurch wird die Integrität des elektrischen Schirmes nicht gefährdet.According to a further variant of the dry-type transformer coil according to the invention, the terminals of the radially outer winding are guided on the face side out of the coil. As a result, the integrity of the electrical screen is not compromised.

Die erfindungsgemäße Aufgabe wird auch gelöst durch einen Trockentransformator, umfassend einen Transformatorkern mit wenigstens zwei Kernschenkeln, wobei um mindestens einen der wenigstens zwei Kernschenkel eine erfindungsgemäße Trockentransformatorspule angeordnet ist und wobei deren jeweiliger elektrischer Schirm mit Erdpotential verbunden ist. Der erfindungsgemäße Berührungsschutz der radialen Außenflächen der Spulen führt in vorteilhafter Weise zu einer Reduktion der Baugröße des Trockentransformators, da auf ein Gehäuse, in welchen der Trockentransformator integriert ist, verzichtet werden kann.The object according to the invention is also achieved by a dry-type transformer comprising a transformer core with at least two core limbs, wherein a dry-type transformer coil according to the invention is arranged around at least one of the at least two core limbs and wherein their respective electrical shield is connected to ground potential. The contact protection according to the invention of the radial outer surfaces of the coils advantageously leads to a reduction in the size of the dry-type transformer, since a housing in which the dry-type transformer is integrated can be dispensed with.

Aber auch bei Verwendung eines Gehäuses kann dieser aufgrund der erfindungsgemäßen Barrierenstruktur kleiner ausgeführt werden als ohne erfindungsgemäße Barrierenstruktur, weil dann innerhalb des Gehäuses deutlich weniger Bereiche mit kritischen Potentialdifferenzen vorhanden sind. So kann beispielsweise die Wandung eines Gehäuses ohne zusätzlichen Isolationsabstand bis direkt an die radiale Außenfläche einer jeweiligen Trockentransformatorspule gebaut werden.But even when using a housing, this can be made smaller due to the barrier structure according to the invention than without barrier structure according to the invention, because then significantly fewer areas with critical potential differences are present within the housing. Thus, for example, the wall of a housing without additional isolation distance can be built up directly to the radial outer surface of a respective dry-type transformer coil.

Für den Fall, dass der Trockentransformator mechanische Komponenten aufweist, welche geerdet sind und welche in sich auch einen mechanischen Berührungsschutz für die Oberflächenbereiche von einer jeweiligen Trockentransformatorspule darstellen, kann in diesen Oberflächenbereichen prinzipiell auch auf eine entsprechende Barrierenstruktur verzichtet werden.In the event that the dry-type transformer has mechanical components which are earthed and which also constitute a mechanical contact protection for the surface regions of a respective dry-type transformer coil, a corresponding barrier structure can in principle also be dispensed with in these surface regions.

Dies ist beispielsweise bei Teilbereichen gegeneinander zugewandter Spulenoberflächen benachbart angeordneter Trockentransformatorspulen der Fall. Hier ist zumindest ein unbeabsichtigtes Berühren ausgeschlossen, weil diese Bereiche zu der den Trockentransformator umschließenden Hüllkontur nach innen zurückgesetzt sind. Deshalb ist in einer Erfindungsvariante vorgesehen, dass die elektrischen Schirme von wenigstens zwei benachbarten Trockentransformatorspulen zumindest in Teilbereichen gegeneinander zugewandter Spulenoberflächen nicht vollumfänglich ausgeführt sind.This is the case, for example, in the case of partial regions of coil surfaces facing one another, arranged adjacent to those of the dry-type transformer coils. Here, at least accidental contact is excluded, because these areas are reset to the enveloping the dry transformer envelope inwards are. Therefore, in a variant of the invention, it is provided that the electrical screens of at least two adjacent dry-transformer coils are not executed completely at least in partial regions of coil surfaces facing one another.

Gemäß einer besonders bevorzugten Ausgestaltungsform des erfindungsgemäßen Trockentransformators sind die elektrischen Schirme derart ausgestaltet und elektrisch miteinander verbunden, dass die wenigstens zwei benachbarten Trockentransformatorspulen hüllenähnlich von dem verbundenen Schirm umschlossen sind. Hierdurch sind alle manuell erreichbaren Bereiche der Spulenoberflächen ohne Risiko berührbar.According to a particularly preferred embodiment of the dry-type transformer according to the invention, the electrical screens are designed and electrically connected to one another in such a way that the at least two adjacent dry-type transformer coils are enveloped by the connected screen. As a result, all manually reachable areas of the coil surfaces can be touched without risk.

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
eine exemplarische Trockentransformatorspule,
Fig. 2
einen ersten exemplarischen Trockentransformator sowie
Fig. 3
einen zweiten exemplarischen Trockentransformator.
Show it:
Fig. 1
an exemplary dry-type transformer coil,
Fig. 2
a first exemplary dry-type transformer as well
Fig. 3
a second exemplary dry-type transformer.

Fig. 1 zeigt eine exemplarische erfindungsgemäße Trockentransformatorspule 10 in einer Draufsicht. Die Trockentransformatorspule 10 umfasst eine hohlzylindrische radial innere Wicklung 12 und eine daran anschließende radial äußere Wicklung 14, welche ineinander verschachtelt sind. Um die radial äußere Oberfläche der durch die Windungen 12, 14 gebildeten Spule ist vollumfänglich eine Barrierenstruktur angeordnet. Die Barrierenstruktur weist mehrere sternähnlich um die Mittelachse der Spule und längs deren axialer Erstreckung verlaufende Leisten 16 auf, durch welche eine ringähnlich um diese herum angeordnete Barrierenwandung 18 radial abgestützt ist. Die axiale Länge der Barrierenwandung 18 übersteigt geringfügig die axiale Länge der Spule, um auch stirnseitig den Berührungsschutz zu erhöhen. Direkt auf der radialen Außenfläche der Barrierenwandung 18 ist ein elektrischer Schirm 20 aufmetallisiert, welcher mit Erdpotential 24 verbunden ist. Auf diese Weise ist ein gefahrloses Berühren der radialen Außenfläche der Trockentransformatorspule auch während deren Betrieb ermöglicht. Die hohlzylindrische Trockentransformatorspule ist um einen Kernschenkel 26 eines Transformatorkerns angeordnet. Fig. 1 shows an exemplary inventive dry-type transformer coil 10 in a plan view. The dry-transformer coil 10 comprises a hollow-cylindrical radially inner winding 12 and an adjoining radially outer winding 14, which are nested one inside the other. A barrier structure is arranged completely around the radially outer surface of the coil formed by the windings 12, 14. The barrier structure has a plurality of star-like around the central axis of the coil and along its axial extent extending strips 16, through which a ring-like arranged around this barrier wall 18 is radially supported. The axial length of the barrier wall 18 slightly exceeds the axial length the coil, in order to increase the frontal protection against contact. Directly on the radial outer surface of the barrier wall 18, an electrical shield 20 is metallized, which is connected to ground potential 24. In this way, a safe contact with the radial outer surface of the dry-transformer coil is also made possible during its operation. The hollow cylindrical dry-type transformer coil is arranged around a core leg 26 of a transformer core.

Fig. 2 zeigt einen ersten exemplarischen Trockentransformator 30 in einer Schnittansicht. Um drei parallel in einer gemeinsamen Ebene angeordnete Kernschenkel eines dreischenkligen Transformatorkerns ist jeweils eine erfindungsgemäße Trockentransformatorspule 32, 34, 36 angeordnet. Jede Trockentransformatorspule 32, 34, 36 weist eine Barrierenstruktur mit einem elektrischen Schirm auf, welcher nicht vollumfänglich um die jeweilige Trockentransformatorspule ausgeprägt ist, sondern in Teilbereichen gegeneinander zugewandter Spulenoberflächen benachbarter Trockentransformatorspulen unterbrochen ist. Die in die Barrierenstrukturen jeweils integriertem elektrischen Schirme sind mechanisch und elektrisch miteinander zu einem geerdeten 44 hüllenähnlichen Schirm 42 verbunden, welcher die drei Trockentransformatorspulen 32, 34, 36 bandähnlich umschließt und durch welchen ein gefahrloses Berühren der zugänglichen Oberflächenbereiche der Trockentransformatorspulen 32, 34, 36 gewährleistet ist. Fig. 2 shows a first exemplary dry-type transformer 30 in a sectional view. To three parallel arranged in a common plane core leg of a three-limbed transformer core each have a dry-type transformer coil 32, 34, 36 is arranged. Each dry-transformer coil 32, 34, 36 has a barrier structure with an electric screen, which is not completely formed around the respective dry-transformer coil, but is interrupted in partial regions of mutually facing coil surfaces of adjacent dry-type transformer coils. The electrical shields respectively integrated in the barrier structures are mechanically and electrically connected together to form a grounded shield 44, which surrounds the three dry transformer coils 32, 34, 36 and ensures safe contact with the accessible surface areas of the dry transformer coils 32, 34, 36 is.

Fig. 3 zeigt einen zweiten exemplarischen Trockentransformator 50 in einer Schnittansicht. Dieser entspricht im Wesentlichen dem in der Figur 2 gezeigten Trockentransformator 30. Um drei parallel in einer gemeinsamen Ebene angeordnete Kernschenkel eines dreischenkligen Transformatorkerns ist jeweils eine erfindungsgemäße Trockentransformatorspule 52, 54, 56 angeordnet. Jede Trockentransformatorspule 52, 54, 56 weist einen separat geerdeten 64 elektrischen Schirm 58, 60, 62 auf, welcher nicht vollumfänglich um die jeweilige Trockentransformatorspule ausgeprägt, sondern in Teilbereichen unterbrochen ist. Da die elektrischen Schirme nicht mechanisch miteinander verbunden sind ist theoretisch zwar ein Berühren gegeneinander zugewandter Spulenoberflächen benachbarter Trockentransformatorspulen 52, 54, 56 möglich, ein unbeabsichtigtes Berühren jedoch aufgrund der schweren Zugänglichkeit der betreffenden Oberflächenbereiche ausgeschlossen. Fig. 3 shows a second exemplary dry-type transformer 50 in a sectional view. This corresponds essentially to that in the FIG. 2 Dry transformer 30 shown around three parallel in a common plane core leg of a three-leg transformer core, a respective dry-type transformer coil 52, 54, 56 is arranged. Each dry-transformer coil 52, 54, 56 has a separately grounded 64 electric screen 58, 60, 62, which is not fully pronounced around the respective dry-transformer coil, but is interrupted in some areas. Since the electrical screens are not mechanically connected to each other, theoretically contacting of mutually facing coil surfaces of adjacent dry-transformer coils 52, 54, 56 is possible, but unintentional contact is precluded due to the difficult accessibility of the respective surface areas.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
exemplarische Trockentransformatorspuleexemplary dry-type transformer coil
1212
radial innen liegende Wicklungradially inner winding
1414
radial außen liegende Wicklungradially outer winding
1616
LeistenAfford
1818
radial abgestützte Barrierenwandungradially supported barrier wall
2020
elektrischer Schirmelectric screen
2222
kanalähnlicher Hohlraumchannel-like cavity
2424
Erdpotentialground
2626
Kernschenkelcore leg
3030
erster exemplarischer Trockentransformatorfirst exemplary dry-type transformer
3232
erste Spule von erstem Trockentransformatorfirst coil of first dry-type transformer
3434
zweite Spule von erstem Trockentransformatorsecond coil of the first dry-type transformer
3636
dritte Spule von erstem Trockentransformatorthird coil of first dry-type transformer
3838
erster Teilbereich gegeneinander zugewandter Spulenoberflächenfirst portion of mutually facing coil surfaces
4040
zweiter Teilbereich gegeneinander zugewandter Spulenoberflächensecond subregion of mutually facing coil surfaces
4242
hüllenähnlich verbundene Schirmesheath-like connected umbrellas
4444
Erdpotentialground
5050
zweiter exemplarischer Trockentransformatorsecond exemplary dry-type transformer
5252
erste Spule von zweitem Trockentransformatorfirst coil of second dry-type transformer
5454
zweite Spule von zweitem Trockentransformatorsecond coil of second dry-type transformer
5656
dritte Spule von zweitem Trockentransformatorthird coil of second dry-type transformer
5858
Schirm von erster SpuleScreen of first coil
6060
Schirm von zweiter SpuleScreen from second spool
6262
Schirm von dritter SpuleScreen from third coil
6464
Erdpotentialground

Claims (8)

Trockentransformatorspule (10, 32, 34, 36, 52, 54, 56), umfassend eine hohlzylindrische Spule mit wenigstens einer radial innen (12) liegenden und einer radial außen (14) liegenden Wicklung,
dadurch gekennzeichnet,
dass an der radial äußeren Oberfläche der Spule eine zumindest teilweise umlaufende und sich wenigstens über deren axiale Länge erstreckende Barrierenstruktur mit wenigstens einer Lage Leisten (16) aus einem isolierenden Material und wenigstens einer radial von diesen abgestützten Barrierewandung (18) vorgesehen ist, wobei die radial äußerste Barrierewandung (18) einen elektrischen Schirm (20, 42, 58, 60, 62) aufweist.A dry-type transformer coil (10, 32, 34, 36, 52, 54, 56) comprising a hollow-cylindrical coil having at least one radially inner (12) and one radially outer (14) lying winding,
characterized,
that an at least partially circumferential and extending at least over the axial length of barrier structure with at least one layer of strips (16) of an insulating material and at least one radially from this supported Barrierewandung (18) is provided on the radially outer surface of the coil, the radially outer barrier wall (18) has an electrical screen (20, 42, 58, 60, 62). Trockentransformatorspule nach Anspruch 1, dadurch gekennzeichnet, dass der elektrische Schirm (20, 42, 58, 60, 62) als metallischer Schirm oder als Metallisierung ausgeführt ist.Dry transformer coil according to claim 1, characterized in that the electric screen (20, 42, 58, 60, 62) is designed as a metallic shield or as a metallization. Trockentransformatorspule nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass zumindest Teile der Barrierenstruktur über die axialen Enden der hohlzylindrischen Spule herausragen.Dry transformer coil according to one of claims 1 or 2, characterized in that at least parts of the barrier structure protrude beyond the axial ends of the hollow cylindrical coil. Trockentransformatorspule nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Barrierenstruktur die Spule vollumfänglich umschließt.Dry transformer coil according to one of the preceding claims, characterized in that the barrier structure surrounds the coil completely. Trockentransformatorspule nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Anschlüsse der radial äußeren Wicklung (14) stirnseitig aus der Spule geführt sind.Dry transformer coil according to one of the preceding claims, characterized in that the connections of the radially outer winding (14) are guided from the end face of the coil. Trockentransformator, umfassend einen Transformatorkern mit wenigstens zwei Kernschenkeln, dadurch gekennzeichnet, dass um mindestens einen der wenigstens zwei Kernschenkel (26) eine Trockentransformatorspule (10, 32, 34, 36, 52, 54, 56) nach einem der Ansprüche 1 bis 5 angeordnet ist und dass deren jeweiliger elektrischer Schirm (20, 42, 58, 60, 62) mit Erdpotential (24, 44, 64) verbunden ist.A dry-type transformer comprising a transformer core with at least two core legs, characterized in that a dry-transformer coil (10, 32, 34, 36, 52, 54, 56) is arranged around at least one of the at least two core legs (26). is arranged according to one of claims 1 to 5 and that their respective electrical screen (20, 42, 58, 60, 62) with ground potential (24, 44, 64) is connected. Trockentransformator nach Anspruch 6, dadurch gekennzeichnet, dass die elektrischen Schirme (20, 42, 58, 60, 62) von wenigstens zwei benachbarten Trockentransformatorspulen (10, 32, 34, 36, 52, 54, 56) zumindest in Teilbereichen gegeneinander zugewandter Spulenoberflächen (38, 40) nicht vollumfänglich ausgeführt sind.Drying transformer according to claim 6, characterized in that the electrical screens (20, 42, 58, 60, 62) of at least two adjacent dry-transformer coils (10, 32, 34, 36, 52, 54, 56) at least in partial areas facing mutually facing coil surfaces ( 38, 40) are not executed in full. Trockentransformator nach Anspruch 7, dadurch gekennzeichnet, dass die elektrischen Schirme (20, 42, 58, 60, 62) derart ausgestaltet und elektrisch miteinander verbunden sind, dass die wenigstens zwei benachbarten Trockentransformatorspulen (10, 32, 34, 36, 52, 54, 56) hüllenähnlich von dem verbundenen Schirm (42) umschlossen sind.Dry-type transformer according to Claim 7, characterized in that the electrical screens (20, 42, 58, 60, 62) are designed and electrically connected to one another such that the at least two adjacent dry-transformer coils (10, 32, 34, 36, 52, 54, 56) are sheath-like enclosed by the bonded screen (42).
EP13005136.0A 2013-10-29 2013-10-29 Dry transformer coil and dry transformer Active EP2869313B1 (en)

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ES13005136.0T ES2639111T3 (en) 2013-10-29 2013-10-29 Dry transformer coil and dry transformer
EP13005136.0A EP2869313B1 (en) 2013-10-29 2013-10-29 Dry transformer coil and dry transformer
PCT/EP2014/071714 WO2015062838A1 (en) 2013-10-29 2014-10-10 Dry-type transformer coil and dry-type transformer

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EP3660874A1 (en) * 2018-11-29 2020-06-03 ABB Schweiz AG Dry transformer

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US11515080B2 (en) 2017-01-25 2022-11-29 Delta Electronics (Shanghai) Co., Ltd Transformer, coil unit and electronic power apparatus
US11417456B2 (en) 2017-01-25 2022-08-16 Delta Electronics (Shanghai) Co., Ltd High-voltage transformer and electronic power apparatus
US11250990B2 (en) 2017-01-25 2022-02-15 Delta Electronics (Shanghai) Co., Ltd High-voltage transformer and electronic power apparatus
CN113808846A (en) * 2021-11-02 2021-12-17 山东电工电气集团智能电气有限公司 Dry-type transformer coil winding method, dry-type transformer coil and dry-type transformer

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