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EP0102513B1 - 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
EP0102513B1
EP0102513B1 EP83107410A EP83107410A EP0102513B1 EP 0102513 B1 EP0102513 B1 EP 0102513B1 EP 83107410 A EP83107410 A EP 83107410A EP 83107410 A EP83107410 A EP 83107410A EP 0102513 B1 EP0102513 B1 EP 0102513B1
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EP
European Patent Office
Prior art keywords
winding
winding parts
cast resin
air
parts
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.)
Expired
Application number
EP83107410A
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German (de)
French (fr)
Other versions
EP0102513A1 (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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Publication date
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Priority to AT83107410T priority Critical patent/ATE17617T1/en
Publication of EP0102513A1 publication Critical patent/EP0102513A1/en
Application granted granted Critical
Publication of EP0102513B1 publication Critical patent/EP0102513B1/en
Expired legal-status Critical Current

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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 casting resin with a main stray channel designed as a cooling channel and with at least one additional axial cooling channel between the individual coaxially arranged winding parts of one or more windings. preferably in the Wick-Jung lying radially outside the main scattering channel.
  • a cast-resin-insulated transformer winding with additional axial cooling channels that are molded into the cast-resin body is already known.
  • This a transformer winding enveloping cast resin body is preferably arranged radially outside the main scattering channel.
  • the manufacture of cast resin bodies enveloping such windings is very complex in terms of manufacturing technology. This is especially true if the radial dimensions of the additional cooling channels are kept small.
  • this known winding design does not change the given relationship between the piece weight of the cast resin body and the nominal power of the transformer. In principle, nothing changes even if the windings are axially divided into several partial windings. In the case of technically usable and sufficiently economical transformers, the nominal power must therefore grow faster than the unit weight of the cast resin body.
  • 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.
  • each of the coaxially arranged winding parts is cast in a separate mold with casting resin, that these winding parts have cross-sectional dimensions which keep cooling channel-forming clearances between adjacent winding parts, that in the circumferential direction by 180 ° reinforcements of the cast resin layer offset against one another on the outer jacket of the outermost cast resin body carry mains connection terminals and tap terminals and also accommodate axially extending connecting conductors for interconnecting the winding parts and that the winding parts belonging to the same winding are clamped between all windings or winding parts and then mounted together in front of the End faces of the cast resin body are galvanically connected to each other.
  • the winding lying radially outside the main scattering channel has an additional cooling channel is the high-voltage winding and that the insulation of the winding part lying between the main scattering channel and the additional cooling channel for the full nominal voltage and the insulation of the outside of the additional cooling channel Winding part is designed for about half the nominal voltage.
  • the coaxially arranged winding parts of this high-voltage winding are each constructed from single coils connected in series in such a way that the galvanic connections of these single coils are accommodated in the inner winding part in a strip formed by the casting opening of the casting mold on the outer jacket of the cast resin body, and in the outer winding part in the Mains connection reinforcement of the cast resin body.
  • these winding parts are themselves electrically connected in series and the input turns of all winding parts are spatially in the same winding end.
  • the winding conductor ends used to connect the coaxially arranged winding parts are located in the region of the end faces of the cast resin bodies in insulating tubes which simultaneously serve as a seal between the winding conductor end and a mold during the casting process.
  • the cross section of the cast resin body is advantageously approximated ring-shaped. Support strips are not required and would also adversely affect the electrical strength in the associated cooling duct.
  • Dry-type transformers constructed in accordance with the invention are very advantageous because they allow an increase in the unit power of cast-resin-insulated transformers while maintaining the manufacturing facilities and manufacturing methods that were previously customary for their manufacture.
  • An undervoltage winding 2 (winding W1) and an high-voltage winding (winding WII) composed of 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 intertwined winding parts 4 and 5 of the high-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 show the arrangement of mains connection terminals 8 and tap terminals 9.
  • mains connection terminals 8 there are also coil connections 11 for the galvanic connection of the individual coils in the winding parts 4 and 5 and axially extending ones Connection conductor 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 connected to one another by means of insulated bridges 12 to form a so-called single-layer circuit of the two winding parts 4 and 5.
  • Reinforcements 10 of the cast resin layer on the outer winding part 5 of the high-voltage winding serve to ensure the required insulation distances within the cast resin body.
  • 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 effects the seal 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 high-voltage side mains connection, is only to be dimensioned for half the nominal voltage.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)

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 mit als Kühlkanal ausgebildetem Hauptstreukanal und mit mindestens einem zusätzlichen axialen Kühlkanai zwischen den einzelnen koaxial angeordneten Wicklungsteilen einer oder mehrerer Wicklungen. vorzugsweise in der radial außerhalb des Hauptstreukanals liegenden Wick-Jung.The invention relates to a dry transformer with windings cast in casting resin with a main stray channel designed as a cooling channel and with at least one additional axial cooling channel between the individual coaxially arranged winding parts of one or more windings. preferably in the Wick-Jung 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 von 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 piece weights of the windings encased in cast resin and the encased cast resin body are subject to limitations for physical and technical reasons.

Durch die DE-B-21 04 112 ist bereits eine gießharzisolierte Transformatorwicktung mit innerhalb des Gießharzkörpers liegenden in diesen eingeformten zusätzlichen axialen Kühlkanälen, bekannt. Dieser eine Transformatorwickfung umhüllende Gießharzkörper ist vorzugs weise radial außerhalb des Hauptstreukanals angeordnet. Die Herstellung derartiger Wicklungen umnüllender Gießharzkörper ist jedoch fertigungstechnisch sehr aufwendig. Dies gilt vor allem dann, wenn die radialen Abmessungen der zusätzlichen Kühlkanäle klein gehalten werden. Darüber hinaus wird durch diese bekannte Wicklungsgestaltung an dem gegebenen Verhältnis zwischen dem Stückgewicht der Gießharzkörper und der Nennleistung des Transformators nichts geändert. Im Prinzip ändert sich daran auch dann nichts, wenn die Wicklungen axial in mehrere Teilwicklungen aufgeteilt sind. Bei technisch brauchbaren und ausreichend wirtschaftlichen Transformatorm muß daher die Nennleistung Starker wachsen als das Stückgewicht der Gießharzkörper.From DE-B-21 04 112 a cast-resin-insulated transformer winding with additional axial cooling channels that are molded into the cast-resin body is already known. This a transformer winding enveloping cast resin body is preferably arranged radially outside the main scattering channel. However, the manufacture of cast resin bodies enveloping such windings is very complex in terms of manufacturing technology. This is especially true if the radial dimensions of the additional cooling channels are kept small. In addition, this known winding design does not change the given relationship between the piece weight of the cast resin body and the nominal power of the transformer. In principle, nothing changes even if the windings are axially divided into several partial windings. In the case of technically usable and sufficiently economical transformers, the nominal power must therefore grow faster than the unit weight of the cast resin body.

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 bei einem Trockentransformator der eingangs genannten Art erfindungsgemäß dadurch gelöst, daß jeder der koaxial angeordneten Wicklungsteile in einer eigenen 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 Verstärkungen der Gießharzschicht auf dem Außenmantel des äußersten Gießharzkörpers Netzanschlußklemmen und Anzapfklemmen tragen und außerdem axial verlaufende Verbindungsleiter zur Verschaltung der Wicklungsteile aufnehmen und daß die jeweils zur selben Wicklung gehörenden Wicklungsteile durch Einspannen zwischen aiien Wicklungen bzw. Wicklungsteilen gemeinsamen elastischen Klötzen montiert und anschließend vor den Stirnseiten der Gießharzkörper galvanisch miteinander verbunden sind.This object is achieved according to the invention in a dry transformer of the type mentioned at the outset in that each of the coaxially arranged winding parts is cast in a separate mold with casting resin, that these winding parts have cross-sectional dimensions which keep cooling channel-forming clearances between adjacent winding parts, that in the circumferential direction by 180 ° reinforcements of the cast resin layer offset against one another on the outer jacket of the outermost cast resin body carry mains connection terminals and tap terminals and also accommodate axially extending connecting conductors for interconnecting the winding parts and that the winding parts belonging to the same winding are clamped between all windings or winding parts and then mounted together in front of the End faces of the cast resin body are galvanically connected to each other.

Durch die DE-B 2246 235 ist zwar 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-B 2246 235 it is known to clamp the windings of transformers enclosed in cast resin between all windings common elastic blocks. however, 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 radial außerhalb des Hauptstreukanals liegende einen zusätzlichen Kühlkanal aufweisende Wicklung die Oberspannungswicklung ist und daß die Isolierung des zwischen dem Hauptstreukanal und dem zusätzlichen Kühlkanal liegenden Wicklungsteils für die volle Nennspannung und die Isolierung des außerhalb des zusätzlichen Kühlkanals liegenden Wicklungsteiles für etwa die halbe Nennspannung ausgelegt ist. Dabei sind die Koaxial angeordneten Wicklungsteile dieser Oberspannungswicklung jeweils aus in Reihe geschalteten Einzeispulen so aufgebaut, daß die galvanischen Verbindungen dieser Einzeispulen 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. Hierbei sind diese Wicklungsteile selbst elektrisch in Reihe geschaltet und liegen die Eingangswindungen aller Wicklungsteile räumlich in demselben Wicklungsende.According to expedient developments of the invention it is provided that the winding lying radially outside the main scattering channel has an additional cooling channel is the high-voltage winding and that the insulation of the winding part lying between the main scattering channel and the additional cooling channel for the full nominal voltage and the insulation of the outside of the additional cooling channel Winding part is designed for about half the nominal voltage. The coaxially arranged winding parts of this high-voltage winding are each constructed from single coils connected in series in such a way that the galvanic connections of these single coils are accommodated in the inner winding part in a strip formed by the casting opening of the casting mold on the outer jacket of the cast resin body, and in the outer winding part in the Mains connection reinforcement of the cast resin body. Here these winding parts are themselves electrically connected in series and the input turns of all winding parts are spatially in the same winding end.

Nach weiteren vorteilhaften Ausgestaltungen der Erfindung liegen die zur Verbindung der koaxial angeordneten Wicklungsteile dienenden Wickelleiterenden im Bereich der Stirnseiten der Gießharzkörper in Isolierschläuchen, die während des Gießvorganges gleichzeitig als Dichtung zwischen dem Wickelleiterende und einer Gießform dienen. Bei der erfindungsgemäßen Wicklungsanordnung ist der Querschnitt der Gießharzkörper vorteilhafterweise angenähert ringförmig. Abstützleisten sind nicht erforderlich und würden zudem die elektrische Festigkeit im zugehörigen Kühlkanal ungünstig beeinflussen.According to further advantageous refinements of the invention, the winding conductor ends used to connect the coaxially arranged winding parts are located in the region of the end faces of the cast resin bodies in insulating tubes which simultaneously serve as a seal between the winding conductor end and a mold during the casting process. In the winding arrangement according to the invention, the cross section of the cast resin body is advantageously approximated ring-shaped. Support strips are not required and would also adversely affect the electrical strength in the associated cooling duct.

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-type transformers constructed in accordance with the invention are very advantageous because they allow an increase in the unit power of cast-resin-insulated transformers while maintaining the manufacturing facilities and manufacturing methods that were previously customary for their manufacture.

Ein Ausführungsbeispiel der Erfindung wird anhand einer Zeichnung näher erläutert.

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

Um einen lamellierten Eisenkern 1 sind radial von innen nach außen eine Unterspannungswicklung 2 (Wicklung Wl) und eine Oberspannungswicklung (Wicklung WII) 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 Oberspannungswickiung 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 (winding W1) and an high-voltage winding (winding WII) composed of 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 intertwined winding parts 4 and 5 of the high-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 this.

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 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 show the arrangement of mains connection terminals 8 and tap terminals 9. In one plane with the mains connection terminals 8 there are also coil connections 11 for the galvanic connection of the individual coils in the winding parts 4 and 5 and axially extending ones Connection conductor 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 connected to one another by means of insulated bridges 12 to form a so-called single-layer circuit of the two winding parts 4 and 5. Reinforcements 10 of the cast resin layer on the outer winding part 5 of the high-voltage winding serve to ensure the required insulation distances within the cast resin body. On the inner winding part 4, to accommodate the coil connections 11, if necessary, a web, not shown, which is simultaneously formed by the mold filling opening can be used. 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 effects the seal 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 high-voltage side mains connection, is only to 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.The power supply terminals 8 opposite, on the other side of the outer winding part 5, a further reinforcement 10 is provided, on which tap terminals 9 are arranged in radially protruding elevations, which in the de-energized state by means of switching bridges 14, a gradual adaptation of the transformation ratio of the transformer to different network loads allow. 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. An air-cooled transformer comprising windings (WI, WII) which are embedded in cast resin, a main leakage channel (3) which forms a cooling channel, and at least one additional axial cooiing channel (6) between the individual coaxially arranged parts (4, 5) of one or more windings (WI, Wll), preferably of the winding (WII) which is radially arranged outside the main leakage channel (3), characterised in
- that each of the coaxially arranged winding parts (4. 5) is embedded with casting resin in a separate mould,
- that the winding parts (4, 5) have cross- sectional dimensions which maintain free spaces which form the cooling channel between mutually adjacent winding parts (4. 5),
- that reinforcements (10) of the cast resin layer which are staggered by 180° in the peripheral direction, support mains connection terminals (8) and tapping terminals (9) on the outer casing of the outer cast resin body (5), and also accomo- date connecting conductors which extend axially and serve to connect the winding parts (4, 5) and
- that the winding parts (4. 5) which are assigned to the same winding (Wll), are mounted by clamping between elastic blocks (7) which are common to all the windings (WI. WII) or winding parts (4, 5), and are subsequently galvanically connected to one another in front of the end faces of the cast resin bodies.
2. An air-cooled transformer as claimed in Claim 1, characterised in that the winding (WIi) which is arranged radially outside the main leakage channel (3) and has an additional cooling channel (6) is the secondary winding ; and that the insulation of the winding part (4), which is arranged between the main leakage channel (3) and the additional cooling channel (6), is designed for the full nominal voltage, and the insulation of the winding part (5) which is arranged outside the additional channel (6), is designed for approximately half the nominal voltage.
3. An air-cooled transformer as claimed in one of Claim 1 or 2, characterised in that the coaxially arranged winding parts (4, 5) are electrically connected in series in a single layer connection ; the initial turns of all the winding parts (4, 5) thereby being arranged in spatially adjacent winding ends.
4. An air-cooled transformer as claimed in one of Claims 1 to 3, characterised in that the coaxially arranged winding parts (4, 5) are respectively formed from series-connected individual coils ; and that, in the case of the inner winding part (4), the galvanic connections of the individual coils are accommodated in a strip which is formed by the pouring opening of the mould, on the outer casing of the cast resin body, and, in the case of the outer winding part (5), the galvanic connections of the individual coils are arranged in the reinforcement (10) of the cast resin body which supports the mains connection terminals (8).
5. An air-cooled transformer as claimed in one of Claims 1 to 4, characterised in that the coaxially arranged winding parts (4, 5) do not contact one another in their installed position and air insulating paths are retained.
6. An air-cooled transformer as claimed in one of Claims 1 to 5, characterised in that in the region of the end faces of the cast resin bodies, the winding conductor ends which serve to connect the coaxially arranged winding parts (4, 5) are arranged in insulating tubes which, during the casting process, simultaneously serve as sealing between the winding conductor end and a mould.
7. An air-cooled transformer as claimed in one of Claims 1 to 6, characterised in that the cross- section of the cast resin bodies is approximately annular.
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 EP0102513A1 (en) 1984-03-14
EP0102513B1 true 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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US6261437B1 (en) 1996-11-04 2001-07-17 Asea Brown Boveri Ab Anode, process for anodizing, anodized wire and electric device comprising such anodized wire
US6279850B1 (en) 1996-11-04 2001-08-28 Abb Ab Cable forerunner
US6357688B1 (en) 1997-02-03 2002-03-19 Abb Ab Coiling device
US6369470B1 (en) 1996-11-04 2002-04-09 Abb Ab Axial cooling of a rotor
US6376775B1 (en) 1996-05-29 2002-04-23 Abb Ab Conductor for high-voltage windings and a rotating electric machine comprising a winding including the conductor
US6396187B1 (en) 1996-11-04 2002-05-28 Asea Brown Boveri Ab Laminated magnetic core for electric machines
US6417456B1 (en) 1996-05-29 2002-07-09 Abb Ab Insulated conductor for high-voltage windings and a method of manufacturing the same
US6429563B1 (en) 1997-02-03 2002-08-06 Abb Ab Mounting device for rotating electric machines
US6439497B1 (en) 1997-02-03 2002-08-27 Abb Ab Method and device for mounting a winding
US6465979B1 (en) 1997-02-03 2002-10-15 Abb Ab Series compensation of electric alternating current machines
US6525504B1 (en) 1997-11-28 2003-02-25 Abb Ab Method and device for controlling the magnetic flux in a rotating high voltage electric alternating current machine
US6646363B2 (en) 1997-02-03 2003-11-11 Abb Ab Rotating electric machine with coil supports
US6801421B1 (en) 1998-09-29 2004-10-05 Abb Ab Switchable flux control for high power static electromagnetic devices
US6822363B2 (en) 1996-05-29 2004-11-23 Abb Ab Electromagnetic device
US6825585B1 (en) 1997-02-03 2004-11-30 Abb Ab End plate
US6831388B1 (en) 1996-05-29 2004-12-14 Abb Ab Synchronous compensator plant

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US6831388B1 (en) 1996-05-29 2004-12-14 Abb Ab Synchronous compensator plant
US6376775B1 (en) 1996-05-29 2002-04-23 Abb Ab Conductor for high-voltage windings and a rotating electric machine comprising a winding including the conductor
US6417456B1 (en) 1996-05-29 2002-07-09 Abb Ab Insulated conductor for high-voltage windings and a method of manufacturing the same
US6822363B2 (en) 1996-05-29 2004-11-23 Abb Ab Electromagnetic device
US6261437B1 (en) 1996-11-04 2001-07-17 Asea Brown Boveri Ab Anode, process for anodizing, anodized wire and electric device comprising such anodized wire
US6279850B1 (en) 1996-11-04 2001-08-28 Abb Ab Cable forerunner
US6369470B1 (en) 1996-11-04 2002-04-09 Abb Ab Axial cooling of a rotor
US6396187B1 (en) 1996-11-04 2002-05-28 Asea Brown Boveri Ab Laminated magnetic core for electric machines
US6439497B1 (en) 1997-02-03 2002-08-27 Abb Ab Method and device for mounting a winding
US6465979B1 (en) 1997-02-03 2002-10-15 Abb Ab Series compensation of electric alternating current machines
US6646363B2 (en) 1997-02-03 2003-11-11 Abb Ab Rotating electric machine with coil supports
US6429563B1 (en) 1997-02-03 2002-08-06 Abb Ab Mounting device for rotating electric machines
US6825585B1 (en) 1997-02-03 2004-11-30 Abb Ab End plate
US6357688B1 (en) 1997-02-03 2002-03-19 Abb Ab Coiling device
US6525504B1 (en) 1997-11-28 2003-02-25 Abb Ab Method and device for controlling the magnetic flux in a rotating high voltage electric alternating current machine
US6801421B1 (en) 1998-09-29 2004-10-05 Abb Ab Switchable flux control for high power static electromagnetic devices

Also Published As

Publication number Publication date
ATE17617T1 (en) 1986-02-15
DE3229480A1 (en) 1984-02-09
NO159893C (en) 1989-02-15
DE3361926D1 (en) 1986-03-06
NO832374L (en) 1984-02-07
US4523171A (en) 1985-06-11
JPS5944810A (en) 1984-03-13
NO159893B (en) 1988-11-07
EP0102513A1 (en) 1984-03-14

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