EP0102513A1 - Air-cooled transformer with windings embedded in cast resin - Google Patents

Air-cooled transformer with windings embedded in cast resin Download PDF

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Publication number
EP0102513A1
EP0102513A1 EP83107410A EP83107410A EP0102513A1 EP 0102513 A1 EP0102513 A1 EP 0102513A1 EP 83107410 A EP83107410 A EP 83107410A EP 83107410 A EP83107410 A EP 83107410A EP 0102513 A1 EP0102513 A1 EP 0102513A1
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EP
European Patent Office
Prior art keywords
winding
winding parts
cast resin
windings
cast
Prior art date
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
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EP83107410A
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German (de)
French (fr)
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EP0102513B1 (en
Inventor
Gerhard Dipl.-Ing. Altmann
Friedrich Alber
Lothar Brzuska
Klaus Seeliger
Walter Schaich
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Transformatoren Union AG
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Transformatoren Union AG
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Priority to AT83107410T priority Critical patent/ATE17617T1/en
Publication of EP0102513A1 publication Critical patent/EP0102513A1/en
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Publication of EP0102513B1 publication Critical patent/EP0102513B1/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
    • H01F27/08—Cooling; Ventilating
    • 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
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • H01F2027/328—Dry-type transformer with encapsulated foil winding, e.g. windings coaxially arranged on core legs with spacers for cooling and with three phases

Definitions

  • the invention relates to a dry transformer with windings cast in cast resin and with at least one axial cooling channel provided in addition to the main scattering channel, preferably in the winding lying radially outside the main scattering channel.
  • a cast-resin-insulated transformer winding with additional axial cooling channels lying inside the cast-resin body is already known from DE-AS 21 04 112.
  • the production of cast resin bodies enveloping such windings is, however, very complex in terms of production technology.
  • this known winding design does not significantly change the practically existing function between the cast resin body piece weight and the nominal power of the transformer. In principle, nothing changes even if the windings are axially divided into several partial windings. For a technically Krt 2 Po / 02.08.1982 Usable and sufficiently economical feasibility of ever increasing ratings of cast resin transformers, therefore, further solutions are necessary.
  • the invention is therefore based on the object of designing the winding structure for cast-resin-insulated transformer windings with additional cooling ducts in such a way that cooling ducts are formed solely by the arrangement of the parts, and all parts can be produced using known methods without particular difficulties, and yet without increasing the piece weights of the cast resin body a significant increase in the maximum possible unit performance of the transformers provided with this winding structure is guaranteed.
  • windings provided with additional cooling channels are divided into mutually coaxial winding parts, each of which is cast in a special casting mold with casting resin, that these winding parts have cross-sectional dimensions that keep cooling channel-forming distances between adjacent winding parts free, that in the circumferential direction
  • Known 180 ° staggered reinforcements of the cast resin layer on the outer jacket of the outermost cast resin body wear mains connection terminals and tap terminals and at the same time serve to accommodate axially extending connecting conductors for the electrical connection of the winding parts and that the winding parts belonging to the same winding after their assembly by clamping between all windings or winding parts common elastic blocks are galvanically connected to each other in front of the end faces of the cast resin body.
  • the high-voltage winding is on the outside and has an additional cooling duct, the insulation of the winding part lying between the main scattering duct and the additional cooling duct being designed for the full nominal voltage and the insulation of the winding part lying outside the additional cooling duct for about half the rated voltage is designed.
  • the winding parts of this high-voltage winding are each constructed from individual coils connected in series in such a way that the galvanic connections of these individual coils for the inner winding part are accommodated in a strip formed by the casting opening of the casting mold on the outer jacket of the cast resin body, and for the outer winding part in which the power supply terminals are carried Reinforcement of the cast resin body.
  • winding parts themselves are electrically connected in series and the input turns 30 of all winding parts are spatially in the same winding end.
  • the winding conductor ends used to connect the winding parts are located in the region of the end faces of the cast resin body in insulating tubes which are used during the Casting process simultaneously serve as a seal between the winding conductor end and a mold.
  • the cross section of the cast resin bodies advantageously represents approximately a circular ring, and the cast resin bodies do not touch one another in their installed position. Aba support strips are not required and would also adversely affect the electrical strength in the associated cooling channel.
  • Dry transformers constructed according to the invention are very advantageous because. they allow an increase in the unit performance of cast-resin-insulated transformers while maintaining the manufacturing facilities and manufacturing processes that were previously customary for their manufacture.
  • An undervoltage winding 2 and an high-voltage winding comprising an inner winding part 4 and an outer winding part 5 are arranged radially from the inside to the outside of a laminated iron core 1.
  • the undervoltage winding 2 and the inner winding part 4 include a main stray channel 3, which also acts as a cooling channel.
  • the coaxially interlocking winding parts 4 and 5 of the upper voltage winding flank an additional cooling channel 6.
  • the undervoltage winding 2 and the winding parts 4 and 5 are held in their installed position by at least partially elastic blocks 7, the blocks 7 engaging on the one hand with lugs in the main stray duct 3 and the additional cooling duct 6 and on the other hand in a manner not shown in detail on one also support the iron core of the transformer that holds the press frame together.
  • the elastic blocks 7 are distributed approximately uniformly over the circumference of the undervoltage winding 2 and the winding parts 4 and 5 and preferably form angles of approximately 45 ° with the longitudinal axis of the transformer.
  • FIGS. 3 and 4 each form an angle of 90 ° with the longitudinal axis of the transformer and show the arrangement of power supply terminals 8 and tap terminals 9.
  • Coil connections 11 for the galvanic are also in one plane with the power supply terminals 8 Connection of the individual coils in the winding parts 4 and 5 and axially extending connecting conductors for the electrical connection of the winding parts 4 and 5 housed.
  • the axially extending connecting conductors are led out of the cast resin bodies through the end faces and are connected to one another by insulated bridges 12 to form a so-called single-layer circuit of the two winding parts 4 and 5.
  • Reinforcements 10 are used to ensure the required insulation distances within the cast resin body Cast resin layer on the outer winding part 5 of the high-voltage winding.
  • a web (not shown), which is simultaneously formed by the mold filling opening, can be used to accommodate the coil connections 11, if necessary.
  • the winding conductor ends led out of the cast resin bodies in the axial direction through the end faces lie in hoses made of elastic insulating material or of another suitable insulating material which at the same time brings about the sealing between the winding conductors and the casting mold.
  • the mains connection terminals 8 lie on thorn-like projections cast onto the outer cast resin body and carry a switching strip 13 through which the high-voltage windings of the transformer, preferably in a delta connection, are connected to one another.
  • the bridges 12 together with the axially extending connecting conductors within one of the reinforcements 10 serve for the above-mentioned single-layer switching of the winding parts 4 and 5.
  • the single-layer switching enforces a uniform voltage load of approximately half the nominal voltage over the entire length of the additional cooling channel 6 .
  • the winding part 4 preferably carries the higher voltage, so that the insulation of the winding part 5, apart from the mains connection on the high-voltage side, can only be dimensioned for half the nominal voltage.
  • a further reinforcement 10 is provided, on which tap terminals 9 are also arranged in radially protruding elevations are, which in the de-energized state by switching bridges 14 allow a gradual adaptation of the transformation ratio of the transformer to different network loads.
  • the tap windings are provided in the middle individual coils of the outer winding part 5 of the high-voltage winding. Instead of two, more taps are possible.

Abstract

A dry-type transformer cast into casting resin, includes windings, a main leakage canal, at least one of the windings being subdivided into coaxial winding parts spaced apart from each other defining an additional axial cooling canal therebetween, separate inner and outer casting resin bodies each having end faces and being cast around a respective one of the winding parts, reinforcements formed on diametrically opposite outer surface regions of the outer casting resin body for receiving axially extended connecting conductors for electrically wiring the winding parts, line terminals and tap terminals disposed on respective reinforcements, and elastic blocks common to all of the windings and winding parts between which the winding parts of a respective winding are clamped and metallically interconnected in front of the end faces of the casting resin bodies.

Description

Die Erfindung betrifft einen Trockentransformator mit in Gießharz eingegossenen Wicklungen und mit mindestens einem zusätzlich zum Hauptstreukanal vorgesehenen axialen Kühlkanal, vorzugsweise in der radial außerhalb des Hauptstreukanals liegenden Wicklung.The invention relates to a dry transformer with windings cast in cast resin and with at least one axial cooling channel provided in addition to the main scattering channel, preferably in the winding lying radially outside the main scattering channel.

Im Zuge des Ausbaues und der Optimierung von Elektrizitätsverteilungsnetzen ist man häufig bestrebt, die Nennspannung und/oder die Einheitsleistung von Transformatoren zu vergrößern. Dabei werden in vielen Fällen Trockentransformatoren eingesetzt. Deren Einheitsleistung und Nennspannung ist jedoch nach oben begrenzt, weil zum einen Probleme mit der Wärmeabfuhr aus dem Kern und den Wicklungen auftreten und weil zum anderen auch die Stückgewichte der vom Gießharz umhüllten Wicklungen sowie der diese einhüllenden Gießharzkörper aus physikalischen und technischen Gründen Begrenzungen unterliegen.In the course of expanding and optimizing electricity distribution networks, efforts are often made to increase the nominal voltage and / or the standard output of transformers. Dry transformers are used in many cases. However, their unit power and nominal voltage are limited because, on the one hand, problems arise with the heat dissipation from the core and the windings and, on the other hand, the unit weights of the windings covered by the casting resin and the casting resin body enveloping them are subject to limitations for physical and technical reasons.

Durch die DE-AS 21 04 112 ist bereits eine gießharzisolierte Transformatorwicklung mit innerhalb des Gießharzkörpers liegenden zusätzlichen axialen Kühlkanälen bekannt. Die Herstellung derartiger Wicklungen umhüllender Gießharzkörper ist jedoch fertigungstechnisch sehr aufwendig. Darüber hinaus wird durch diese bekannte Wicklungsgestaltung an der praktisch bestehenden Funktion zwischen dem Gießharzkörperstückgewicht und der Nennleistung des Transformators nichts Wesentliches geändert. Im Prinzip ändert sich daran auch dann nichts, wenn die Wicklungen axial in mehrere Teilwicklungen aufgeteilt sind. Für eine technisch Krt 2 Po/02.08.1982 brauchbare und ausreichend wirtschaftliche Ausführbarkeit immer größerer Nennleistungen von Gießharztransformatoren sind daher weitergehende Lösungen notwendig.A cast-resin-insulated transformer winding with additional axial cooling channels lying inside the cast-resin body is already known from DE-AS 21 04 112. The production of cast resin bodies enveloping such windings is, however, very complex in terms of production technology. In addition, this known winding design does not significantly change the practically existing function between the cast resin body piece weight and the nominal power of the transformer. In principle, nothing changes even if the windings are axially divided into several partial windings. For a technically Krt 2 Po / 02.08.1982 Usable and sufficiently economical feasibility of ever increasing ratings of cast resin transformers, therefore, further solutions are necessary.

Der Erfindung liegt daher die Aufgabe zugrunde, für gießharzisolierte Transformatorwicklungen mit zusätzlichen Kühlkanälen den Wicklungsaufbau so zu gestalten, daß allein durch die Anordnung der Teile Kühlkanäle entstehen und dabei alle Teile unter Anwendung von an sich bekannten Verfahren ohne besondere Schwierigkeiten herstellbar sind und daß trotzdem ohne Erhöhung der Stückgewichte der Gießharzkörper eine wesentliche Erhöhung der maximal möglichen Einheitsleistungen der mit diesem Wicklungsaufbau versehenen Transformatoren gewährleistet ist.The invention is therefore based on the object of designing the winding structure for cast-resin-insulated transformer windings with additional cooling ducts in such a way that cooling ducts are formed solely by the arrangement of the parts, and all parts can be produced using known methods without particular difficulties, and yet without increasing the piece weights of the cast resin body a significant increase in the maximum possible unit performance of the transformers provided with this winding structure is guaranteed.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß mit zusätzlichen Kühlkanälen versehene Wicklungen in zueinander koaxiale Wicklungsteile aufgeteilt sind, deren jeder in einer besonderen Gießform mit Gießharz umgossen ist, daß diese Wicklungsteile Querschnittsabmessungen aufweisen, die zwischen einander benachbarten Wicklungsteilen kühlkanalbildende Abstände freihalten, daß in Umfangsrichtung um 180° gegeneinander versetzte an sich bekannte Verstärkungen der Gießharzschicht auf dem Außenmantel des äußersten Gießharzkörpers Netzanschlußklemmen und Anzapfklemmen tragen und gleichzeitig zur Aufnahme axial verlaufender Verbindungsleiter zur elektrischen Verschaltung der Wicklungsteile dienen und daß die jeweils zur selben Wicklung gehörenden Wicklungsteile nach ihrer Montage durch Einspannen zwischen allen Wicklungen bzw. Wicklungsteilen gemeinsamen elastischen Klötzen vor den Stirnseiten der Gießharzkörper galvanisch miteinder verbunden sind.This object is achieved in that windings provided with additional cooling channels are divided into mutually coaxial winding parts, each of which is cast in a special casting mold with casting resin, that these winding parts have cross-sectional dimensions that keep cooling channel-forming distances between adjacent winding parts free, that in the circumferential direction Known 180 ° staggered reinforcements of the cast resin layer on the outer jacket of the outermost cast resin body wear mains connection terminals and tap terminals and at the same time serve to accommodate axially extending connecting conductors for the electrical connection of the winding parts and that the winding parts belonging to the same winding after their assembly by clamping between all windings or winding parts common elastic blocks are galvanically connected to each other in front of the end faces of the cast resin body.

Durch die DE-AS 22 46 235 ist zwar auch schon bekannt, die in Gießharz eingeschlossenen Wicklungen von Transformatoren zwischen allen Wicklungen gemeinsamen elastischen Klötzen einzuspannen, jedoch wird bei dieser bekannten Anordnung eine in radialer Richtung jeweils einstückige Ausführung jeder der Wicklungen des Transformators vorausgesetzt. Diese Voraussetzung erfüllen auch axial unterteilte Wicklungen, deren Teilstücke mechanisch miteinander verbunden sind.From DE-AS 22 46 235 it is already known to clamp the windings of transformers enclosed in cast resin between all windings common elastic blocks, but in this known arrangement a one-piece design of each of the windings of the transformer is assumed in the radial direction. This requirement is also met by axially divided windings, the sections of which are mechanically connected to one another.

Nach zweckmäßigen Weiterbildungen der Erfindung ist vorgesehen, daß die Oberspannungswicklung außen liegt und einen zusätzlichen Kühlkanal aufweist, wobei die Isolierung des zwischen dem Hauptstreukanal und dem zusätzlichen Kühlkanal liegenden Wicklungsteils für die volle Nennspannung ausgelegt ist und wobei die Isolierung des außerhalb des zusätzlichen Kühlkanals liegenden Wicklungsteiles für etwa die halbe Nennspannung ausgelegt ist. Dabei sind die Wicklungsteile dieser Oberspannungswicklung jeweils aus in Reihe geschalteten Einzelspulen so aufgebaut, daß die galvanischen Verbindungen dieser Einzelspulen beim innenliegenden Wicklungsteil in einer von der Eingußöffnung der Gießform gebildeten Leiste auf dem Außenmantel des Gießharzkörpers untergebracht sind, und beim außenliegenden Wicklungsteil in der die Netzanschlußklemmen tragenden Verstärkung des Gießharzkörpers liegen.According to expedient developments of the invention it is provided that the high-voltage winding is on the outside and has an additional cooling duct, the insulation of the winding part lying between the main scattering duct and the additional cooling duct being designed for the full nominal voltage and the insulation of the winding part lying outside the additional cooling duct for about half the rated voltage is designed. The winding parts of this high-voltage winding are each constructed from individual coils connected in series in such a way that the galvanic connections of these individual coils for the inner winding part are accommodated in a strip formed by the casting opening of the casting mold on the outer jacket of the cast resin body, and for the outer winding part in which the power supply terminals are carried Reinforcement of the cast resin body.

Hierbei sind die Wicklungsteile selbst elektrisch in Reihe geschaltet und liegen die Eingangswindungen 30 aller Wicklungsteile räumlich in demselben Wicklungsende.Here, the winding parts themselves are electrically connected in series and the input turns 30 of all winding parts are spatially in the same winding end.

Nach weiteren vorteilhaften Ausgestaltungen der Erfindung liegen die zur Verbindung der Wicklungsteile dienenden Wickelleiterenden im Bereich der Stirnseiten der Gießharzkörper in Isolierröhrchen, die während des Gießvorganges gleichzeitig als Dichtung zwischen dem Wickelleiterende und einer Gießform dienen. Bei der erfindungsgemäßen Wicklungsanordnung stellt der Querschnitt der Gießharzkörper vorteilhaftweise angenähert einen Kreisring dar, und berühren sich die Gießharzkörper in ihrer Einbaulage gegenseitig nicht. Abatützleisten sind nicht erforderlich und würden zudem die elektrische Festigkeit im zugehörigen Kühlkkanal ungünstig beeinflussen.According to further advantageous embodiments of the invention, the winding conductor ends used to connect the winding parts are located in the region of the end faces of the cast resin body in insulating tubes which are used during the Casting process simultaneously serve as a seal between the winding conductor end and a mold. In the winding arrangement according to the invention, the cross section of the cast resin bodies advantageously represents approximately a circular ring, and the cast resin bodies do not touch one another in their installed position. Aba support strips are not required and would also adversely affect the electrical strength in the associated cooling channel.

Erfindungsgemäß aufgebaute Trockentransformatoren sind sehr vorteilhaft, denn. sie erlauben eine Vergrößerung der Einheitsleistung von gießharzisolierten Transformatoren unter Beibehaltung der zu ihrer Herstellung schon bisher üblichen Fertigungseinrichtungen und Fertigungsverfahren.Dry transformers constructed according to the invention are very advantageous because. they allow an increase in the unit performance of cast-resin-insulated transformers while maintaining the manufacturing facilities and manufacturing processes that were previously customary for their manufacture.

Ein Ausführungsbeispiel der Erfindung wird anhand einer Zeichnung näher erläutert.

  • Fig. 1 ist eine Draufsicht auf eine Wicklungsanordnung.
  • Fig. 2 zeigt die Wicklungsanordnung nach Fig. 1 im achsparallelen Schnitt im Bereich von die Wicklungen haltenden Klötzen,
  • Fig. 3 im Bereich von Netzanschlußklemmen und
  • Fig. 4 im Bereich von Anzapfklemmen.
An embodiment of the invention is explained in more detail with reference to a drawing.
  • 1 is a top view of a winding arrangement.
  • 2 shows the winding arrangement according to FIG. 1 in an axially parallel section in the region of blocks holding the windings,
  • Fig. 3 in the area of power terminals and
  • Fig. 4 in the area of tap terminals.

Um einen lamellierten Eisenkern 1 sind radial von innen nach außen eine Unterspannungswicklung 2 und eine Oberspannungswicklung aus einem inneren Wicklungsteil 4 sowie einem äußeren Wicklungsteil 5 angeordnet. Die Unterspannungswicklung 2 und der innere Wicklungsteil 4 schließen einen Hauptstreukanal 3, der gleichzeitig als Kühlkanal wirkt, ein. Die koaxial ineinanderstehenden Wicklungsteile 4 und 5 der Oberspannungswicklung flankieren einen zusätzlichen Kühlkanal 6. Im Hinblick auf die bessere Wärmeabfuhr von dem äußeren Wicklungsteil 5 sind in diesem etwas mehr als die Hälfte der Windungen der Oberspannungswicklung angeordnet.An undervoltage winding 2 and an high-voltage winding comprising an inner winding part 4 and an outer winding part 5 are arranged radially from the inside to the outside of a laminated iron core 1. The undervoltage winding 2 and the inner winding part 4 include a main stray channel 3, which also acts as a cooling channel. The coaxially interlocking winding parts 4 and 5 of the upper voltage winding flank an additional cooling channel 6. With a view to better heat dissipation from the outer winding part 5, slightly more than half of the turns of the high-voltage winding are arranged in the latter.

Die Unterspannungswicklung 2 sowie die Wicklungsteile 4 und 5 werden durch mindestens teilweise elastische Klötze 7 in ihrer Einbaulage gehalten, wobei die Klötze 7 einerseits mit Nasen in den Hauptstreukanal 3 und den zusätzlichen Kühlkanal 6 eingreifen und sich andererseits in nicht näher dargestellter Art und Weise an einem auch den Eisenkern des Transformators zusammenhaltenden Preßgestell abstützen. Die elastischen Klötze 7 sind annähernd gleichmäßig auf den Umfang der Unterspannungswicklung 2 sowie der Wicklungsteile 4 und 5 verteilt und bilden mit der Transformatorlängsachse vorzugweise Winkel von etwa 45°.The undervoltage winding 2 and the winding parts 4 and 5 are held in their installed position by at least partially elastic blocks 7, the blocks 7 engaging on the one hand with lugs in the main stray duct 3 and the additional cooling duct 6 and on the other hand in a manner not shown in detail on one also support the iron core of the transformer that holds the press frame together. The elastic blocks 7 are distributed approximately uniformly over the circumference of the undervoltage winding 2 and the winding parts 4 and 5 and preferably form angles of approximately 45 ° with the longitudinal axis of the transformer.

Die in den Figuren 3 und 4 dargestellten achsparallelen Schnitte der Wicklungsanordnung schließen mit der Transformatorlängsachse jeweils einen Winkel von 90° ein und zeigen die Anordnung von Netzanschlußklemmen 8 bzw. von Anzapfklemmen 9. In einer Ebene mit den Netzanschlußklemmen 8 sind darüber hinaus Spulenverbindungen 11 zur galvanischen Verbindung der Einzelspulen in den Wicklungsteilen 4 und 5 sowie axial verlaufende Verbindungsleiter zur elektrischen Verschaltung der Wicklungsteile 4 und 5 untergebracht.The axially parallel sections of the winding arrangement shown in FIGS. 3 and 4 each form an angle of 90 ° with the longitudinal axis of the transformer and show the arrangement of power supply terminals 8 and tap terminals 9. Coil connections 11 for the galvanic are also in one plane with the power supply terminals 8 Connection of the individual coils in the winding parts 4 and 5 and axially extending connecting conductors for the electrical connection of the winding parts 4 and 5 housed.

Die axial verlaufenden Verbindungsleiter sind bis durch die Stirnseiten aus den Gießharzkörpern hinausgeführt und durch isolierte Brücken 12 zu einer sogenannten Einzellagenschaltung der beiden Wicklungsteile 4 und 5 miteinander verbunden. Dabei dienen zur Gewährleistung der erforderlichen Isolationsabstände innerhalb des Gießharzkörpers Verstärkungen 10 der Gießharzschicht an dem äußeren Wicklungsteil 5 der Oberspannungswicklung. An dem inneren Wicklungsteil 4 kann zur Unterbringung der Spulenverbindungen 11 erforderlichenfalls ein gleichzeitig von der Gießformeinfüllöffnung mitgeformter, nicht dargestellter Steg Verwendung finden. Die aus den Gießharzkörpern in Achsrichtung durch die Stirnflächen herausgeführten Wickelleiterenden liegen in Schläuchen aus elastischem Isolierwerkstoff, oder aus einem anderen geeigneten Isolierwerkstoff, der gleichzeitig die.Abdichtung zwischen den Wickelleitern und der Gießform bewerkstelligt.The axially extending connecting conductors are led out of the cast resin bodies through the end faces and are connected to one another by insulated bridges 12 to form a so-called single-layer circuit of the two winding parts 4 and 5. Reinforcements 10 are used to ensure the required insulation distances within the cast resin body Cast resin layer on the outer winding part 5 of the high-voltage winding. On the inner winding part 4, a web (not shown), which is simultaneously formed by the mold filling opening, can be used to accommodate the coil connections 11, if necessary. The winding conductor ends led out of the cast resin bodies in the axial direction through the end faces lie in hoses made of elastic insulating material or of another suitable insulating material which at the same time brings about the sealing between the winding conductors and the casting mold.

Die Netzanschlußklemmen 8 liegen auf an den äußeren Gießharzkörper angegossenen dornartigen Ansätzen und tragen eine Schaltleiste 13, durch die die Oberspannungswicklungen des Transformators, vorzugsweise in Dreiecks-Schaltung, miteinander verbunden sind. Die Brücken 12 dienen zusammen mit den axial verlaufenden Verbindungsleitern innerhalb einer der Verstärkungen 10 zur oben bereits erwähnten Einzellagenschaltung der Wicklungsteile 4 und 5. Durch die Einzellagenschaltung wird über die gesamte Länge des zusätzlichen Kühlkanals 6 eine gleichmäßige Spannungsbelastung in Höhe von etwa der Hälfte der Nennspannung erzwungen. Dabei führt vorzugsweise der Wickungsteil 4 die höhere Spannung, so daß die Isolierung des Wicklungsteiles 5, abgesehen von dem oberspannungsseitigen Netzanschluß nur für die halbe Nennspannung zu dimensionieren ist.The mains connection terminals 8 lie on thorn-like projections cast onto the outer cast resin body and carry a switching strip 13 through which the high-voltage windings of the transformer, preferably in a delta connection, are connected to one another. The bridges 12 together with the axially extending connecting conductors within one of the reinforcements 10 serve for the above-mentioned single-layer switching of the winding parts 4 and 5. The single-layer switching enforces a uniform voltage load of approximately half the nominal voltage over the entire length of the additional cooling channel 6 . In this case, the winding part 4 preferably carries the higher voltage, so that the insulation of the winding part 5, apart from the mains connection on the high-voltage side, can only be dimensioned for half the nominal voltage.

Den Netzanschlußklemmen 8 gegenüber, auf der anderen Seite des äußeren Wicklungsteiles 5 ist eine weitere Verstärkung 10 vorgesehen, auf der in ebenfalls radial vorstehenden Erhöhungen Anzapfklemmen 9 angeordnet sind, die im jeweils spannungslosen Zustand durch Schaltbrücken 14 eine stufenweise Anpassung des Übersetzungsverhältnisses des Transformators an unterschiedliche Netzbelastungen gestatten. Zur Gewährleistung symmetrischer Feldverteilungen sind dabei die Anzapfwindungen in den mittleren Einzelspulen des äußeren Wicklungsteiles 5 der Oberspannungswicklung vorgesehen. Dabei sind anstelle von zwei auch mehr Anzapfungen möglich.Opposite the mains connection terminals 8, on the other side of the outer winding part 5, a further reinforcement 10 is provided, on which tap terminals 9 are also arranged in radially protruding elevations are, which in the de-energized state by switching bridges 14 allow a gradual adaptation of the transformation ratio of the transformer to different network loads. To ensure symmetrical field distributions, the tap windings are provided in the middle individual coils of the outer winding part 5 of the high-voltage winding. Instead of two, more taps are possible.

Claims (7)

1. Trockentransformator mit in Gießharz eingegossenen Wicklungen und mit mindestens einem zusätzlich zum Hauptstreukanal vorgesehenen axialen Kühlkanal, vorzugsweise in der radial außerhalb des Hauptstreukanals liegenden Wicklung, dadurch gekennzeichnet , - daß mit zusätzlichen Kühlkanälen (6) versehene Wicklungen in koaxiale Wicklungsteile (4, 5) aufgeteilt sind, deren jeder in einer besonderen Gießform mit Gießharz umgossen ist, - daß diese Wicklungsteile (4, 5) Querschnittsabmessungen aufweisen, die zwischen einander benachbarten Wicklungsteilen (4, 5) kühlkanalbildende Abstände freihalten, - daß in Umfangsrichtung um 1800 gegeneinader versetzte an sich bekannte Verstärkungen (10) der Gießharzschicht auf dem Außenmantel des äußersten Gießharzkörpers (5) Netzanschlußklemmen (8) und Anzapfklemmen (9) tragen und gleichzeitig zur Aufnahme axial verlaufender Verbindungsleiter zur elektrischen Verschaltung der Wicklungsteile (4, 5) dienen und - daß die jeweils zur selben Wicklung gehörenden Wicklungsteile (4, 5) nach ihrer Montage durch Einspannen zwischen allen Wicklungen (2) bzw.Wicklungsteilen (4, 5) gemeinsamen elastischen Klötzen (7) vor den Stirnseiten der Gießharzkörper galvanisch miteinander verbunden sind. 1. Dry transformer with windings cast in cast resin and with at least one axial cooling channel provided in addition to the main spreading channel, preferably in the winding lying radially outside the main spreading channel, characterized in that - That with additional cooling channels (6) provided windings are divided into coaxial winding parts (4, 5), each of which is cast with resin in a special mold, - that these winding parts (4, 5) have cross-sectional dimensions that keep clear cooling channel-forming distances between adjacent winding parts (4, 5), - That in the circumferential direction by 180 0 offset against each other known reinforcements (10) of the cast resin layer on the outer jacket of the outermost cast resin body (5) carry power supply terminals (8) and tap terminals (9) and at the same time for receiving axially extending connecting conductors for the electrical connection of the winding parts ( 4, 5) serve and - That the winding parts (4, 5) belonging to the same winding are galvanically connected to each other after their assembly by clamping between all windings (2) or winding parts (4, 5) common elastic blocks (7) in front of the end faces of the cast resin body. 2. Trockentransformator nach Anspruch 1, dadurch gekennzeichnet , daß die Oberspannungswicklung außen liegt und einen zusätzlichen Kühlkanal (6) aufweist, wobei die Isolierung des zwischen dem Hauptstreukanal (3) und dem zusätzlichen Kühlkanal (6) liegenden Wicklungsteils (4) für die volle Nennspannung ausgelegt ist und wobei die Isolierung des außerhalb des zusätzlichen Kühlkanals (6) liegenden Wicklungsteils (5) für etwa die halbe Nennspannung ausgelegt ist.2. Dry transformer according to claim 1, characterized in that the high-voltage winding is on the outside and has an additional cooling duct (6), the insulation of the winding part (4) lying between the main stray duct (3) and the additional cooling duct (6) for the full nominal voltage is designed and the insulation of the except half of the additional cooling channel (6) lying winding part (5) is designed for about half the rated voltage. 3. Trockentransformator nach Anspruch 1 und 2, dadurch gekennzeichnet , daß die Wicklungsteile (4, 5) in Einzellagenschaltung elektrisch in Reihe geschaltet sind und dabei die Eingangswindungen aller Wicklungsteile (4, 5) in räumlich benachbarten Wicklungsenden liegen.3. Dry transformer according to claim 1 and 2, characterized in that the winding parts (4, 5) are electrically connected in series in a single-layer circuit and the input turns of all winding parts (4, 5) lie in spatially adjacent winding ends. 4. Trockentransformator nach Anspruch 1 bis 3, dadurch gekennzeichnet , daß die Wicklungsteile (4, 5) jeweils aus in Reihe geschalteten Einzelspulen aufgebaut sind, und daß die galvanischen Verbindungen dieser Einzelspulen beim innenliegenden Wicklungsteil (4) in einer von der Eingußöffnung der Gießform gebildeten Leiste auf dem Außenmantel des Gießharzkörpers untergebracht sind, und bei außenliegendem Wicklungsteil (5) in der die Netzanschlußklemmen (8) tragenden Verstärkung (10) des Gießharzkörpers liegen.4. Dry transformer according to claim 1 to 3, characterized in that the winding parts (4, 5) are each constructed from series-connected individual coils, and that the galvanic connections of these individual coils in the inner winding part (4) in one of the pouring opening of the mold Bar are housed on the outer jacket of the cast resin body, and with the external winding part (5) in which the network connection terminals (8) carrying reinforcement (10) of the cast resin body. 5. Trockentransformator nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß die Wicklungsteile (4, 5) sich in ihrer Einbaulage gegenseitig nicht berühren und Luftisolierstrecken erhalten bleiben.5. Dry transformer according to claim 1 to 4, characterized in that the winding parts (4, 5) do not touch each other in their installed position and air insulation distances are retained. 6. Trockentransformator nach Anspruch 1 bis 5 , dadurch gekennzeichnet , daß die zur Verbindung der Wicklungsteile (4, 5) dienenden Wickelleiterenden im Bereich der Stirnseiten der Gießharzkörper in Isolierschläuchen oder ähnlichem Isolierwerkstoff liegen, die während des Gießvorganges gleichzeitig als Dichtung zwischen dem Wickelleiterende und einer Gießform dienen.6. Dry transformer according to claim 1 to 5, characterized in that the connection of the winding parts (4, 5) serving winding conductor ends in the region of the end faces of the cast resin body in insulating tubes or similar insulating material, which at the same time as a seal between the end of the winding conductor and one during the casting process Serve mold. 7. Trockentransformator nach Anspruch 1 bis 6, dadurch gekennzeichnet , daß der Querschnitt der Gießharzkörper angenähert einen Kreisring darstellt.7. Dry transformer according to claim 1 to 6, characterized in that the cross section of the cast resin body approximately represents a circular ring.
EP83107410A 1982-08-06 1983-07-27 Air-cooled transformer with windings embedded in cast resin Expired EP0102513B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83107410T ATE17617T1 (en) 1982-08-06 1983-07-27 DRY TRANSFORMER WITH WINDINGS CAST IN RESIN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3229480 1982-08-06
DE19823229480 DE3229480A1 (en) 1982-08-06 1982-08-06 DRY TRANSFORMER WITH WINDINGS POOLED IN CAST RESIN

Publications (2)

Publication Number Publication Date
EP0102513A1 true EP0102513A1 (en) 1984-03-14
EP0102513B1 EP0102513B1 (en) 1986-01-22

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ID=6170340

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83107410A Expired EP0102513B1 (en) 1982-08-06 1983-07-27 Air-cooled transformer with windings embedded in cast resin

Country Status (6)

Country Link
US (1) US4523171A (en)
EP (1) EP0102513B1 (en)
JP (1) JPS5944810A (en)
AT (1) ATE17617T1 (en)
DE (2) DE3229480A1 (en)
NO (1) NO159893C (en)

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DE19809572A1 (en) * 1998-03-05 1999-10-14 Siemens Ag Resin=cast transformer
WO2006103193A3 (en) * 2005-04-01 2007-02-22 Siemens Ag Transformer provided with an electrical shielding
DE102007053685A1 (en) * 2007-11-10 2009-05-14 Abb Technology Ag Manufacturing method for a multi-layer transformer winding with insulation layer
EP2651020A3 (en) * 2012-04-10 2016-10-26 RITZ Instrument Transformers GmbH Voltage converter

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US5656984A (en) * 1995-04-06 1997-08-12 Centre D'innovation Sur Le Transport D'energie Du Quebec Solid insulation transformer
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WO2006103193A3 (en) * 2005-04-01 2007-02-22 Siemens Ag Transformer provided with an electrical shielding
US8085121B2 (en) 2005-04-01 2011-12-27 Siemens Aktiengesellschaft Transformer with electrical shield
DE102007053685A1 (en) * 2007-11-10 2009-05-14 Abb Technology Ag Manufacturing method for a multi-layer transformer winding with insulation layer
EP2651020A3 (en) * 2012-04-10 2016-10-26 RITZ Instrument Transformers GmbH Voltage converter

Also Published As

Publication number Publication date
NO159893B (en) 1988-11-07
EP0102513B1 (en) 1986-01-22
JPS5944810A (en) 1984-03-13
DE3361926D1 (en) 1986-03-06
NO832374L (en) 1984-02-07
ATE17617T1 (en) 1986-02-15
US4523171A (en) 1985-06-11
DE3229480A1 (en) 1984-02-09
NO159893C (en) 1989-02-15

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