EP0058905B1 - Transformer or inductance cooled by insulating liquid, method and device for manufacturing them - Google Patents

Transformer or inductance cooled by insulating liquid, method and device for manufacturing them Download PDF

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Publication number
EP0058905B1
EP0058905B1 EP82101098A EP82101098A EP0058905B1 EP 0058905 B1 EP0058905 B1 EP 0058905B1 EP 82101098 A EP82101098 A EP 82101098A EP 82101098 A EP82101098 A EP 82101098A EP 0058905 B1 EP0058905 B1 EP 0058905B1
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EP
European Patent Office
Prior art keywords
turns
winding
sheet
transformer
cooling channel
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82101098A
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German (de)
French (fr)
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EP0058905A1 (en
Inventor
Bertil Dipl.-Ing. Moritz
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ABB Norden Holding AB
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ASEA AB
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/125—Other insulating structures; Insulating between coil and core, between different winding sections, around the coil
    • 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
    • H01F27/322—Insulating of coils, windings, or parts thereof the insulation forming channels for circulation of the fluid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor

Definitions

  • the invention relates to a transformer cooled with insulating liquid or a correspondingly cooled choke according to the preamble of claim 1, a manufacturing method for the transformer or the choke and an arrangement for carrying out such a method.
  • the radial distance of the conductor strip from the geometric axis of the winding varies in the axial direction in the case of such windings and, at least for the radially outer part of the winding, is greatest at the axial winding ends.
  • filling is required in order to obtain the desired funnel-shaped shape at the axial winding ends. It is desirable, inter alia for dielectric reasons, that this fill be made of an electrically insulating material. Since such a material has poor thermal conductivity, the fill must lie in thermal planes of symmetry, i. H. either in the middle of the cooling channels or in the middle between two adjacent cooling channels, so that the heat conduction in the radial direction is not hindered.
  • the invention has for its object to develop a transformer or a choke of the type mentioned so that the problem shown in the application of filler in the axial end regions of the winding is solved in a simple manner.
  • a transformer or a choke is provided according to the preamble of claim 1 with the features mentioned in the characterizing part of claim 1.
  • the invention is based on the idea of integrating the filler mentioned at the beginning into the cooling channel elements.
  • the cooling duct element is preferably made from an initially flat, rectangular compression washer, which is provided on one broad side with such a profile that the washer in the areas along two opposite parallel narrow sides has an increasing thickness towards these narrow sides, which is so dimensioned that the edge sections of the conductor strip get the desired bent shape.
  • the cooling duct elements are preferably produced by means of a sawing machine which works with a plurality of saw blades with two different diameters.
  • the saw blades are arranged alternately with the two existing diameters coaxially next to one another on a shaft which can be raised and lowered in relation to a support plane on which the insulating material disks for the cooling channel elements are advanced.
  • the height of the shaft is controlled depending on the position of the insulating material disc on the support level. This control is preferably carried out with the aid of a processor.
  • the profile of the cooling channel element can be changed as desired and can be adapted to all desired shapes. When winding the winding, one only needs to take into account the sequence of the cooling channel elements in order to obtain the desired shape of the winding.
  • Figure 1 shows part of a transformer core with leg 1 and upper and lower yoke 2 and 3. Concentrically around the leg 1, an inner winding 4 and an outer winding 5 are arranged.
  • the windings consist of aluminum or copper foil 6 or 7 wound in many turns, the thickness of which can be between 0.01 and 3 mm. Between the turns there is a film of suitable insulating material, for example polyethylene glycol terephthalate, the thickness of which can be, for example, between 0.01 and 0.1 mm.
  • the inner winding 4 is wound on a winding cylinder 8, for example made of glass fiber reinforced polyester or metallic material such as. B. aluminum.
  • the outer winding 5 is wound on the inner winding with an intermediate insulation gap in which ribs 9 made of pressboard, bakelite or glass fiber reinforced polyester are arranged parallel to the axis of the windings.
  • the iron core of the transformer with the windings is in a with insulating liquid, for. B. oil, filled transformer tank.
  • the windings are cooled in that the insulating liquid circulates through cooling channels in the windings, which are formed by cooling channel elements which are arranged between two adjacent turns of the conductor strip at different radial distances from the geometric axis of the windings. In Figure 1, only the cooling channel elements 10 to 14 are shown in the outer winding 5.
  • FIGS 2 to 5 show the structure of the cooling duct element 13.
  • the other cooling duct elements in the outer winding are constructed in the same way.
  • the cooling duct element 13 shown is produced from a rectangular, originally flat clamping chip with a thickness h of, for example, 8 mm, a width of, for example, 0.5 m and a length which has at least the width of the conductor foil, for example 2 m.
  • One broadside of the press washer is worked on profile, z. B. sawn that the disk gets a thickness increasing towards its two narrow sides 15, 16.
  • Parallel grooves 17 are formed on both broad sides of the disk and form cooling channels.
  • the grooves 17 on the two broad sides of the disk lie exactly opposite one another in pairs and extend from one narrow side 15, 16 of the disk to the other.
  • the remaining material on the sides of the grooves 17 forms the spacer elements 18, while the remaining material on the bottom of the grooves forms the connecting pieces 19.
  • the thicker edge regions of the elements are frayed by the provision of continuous grooves 20 at the ends of each second connecting piece 19. These edge areas are also softened by pushing them through softening rollers, after which they can easily assume the shape shown in FIG.
  • FIGS. 6 and 7 schematically show a saw for sawing cooling duct elements of the type shown in FIGS. 2 to 5.
  • the saw has a fixed stand with a horizontal stand part 21 and a vertical stand part 22 arranged thereon.
  • the horizontal stand part 21 there are several support rollers 23 mounted on which the insulating disks provided for the production of cooling channel elements are pushed forward during sawing.
  • the saw is provided with a large number of saw blades 24, 25, which have two different diameters.
  • the saw blades are fastened coaxially next to one another on a shaft 26, on which a pulley 27 is also seated, via which the shaft is driven by a motor 29 by means of a V-belt 28.
  • the one of two diameters saw blades are alternately attached to the shaft 26, so that adjacent saw blades 24, 25 always have different diameters.
  • the shaft 26 is mounted in a holder which is vertically displaceable on the vertical stand part 22.
  • This holder comprises two vertical supports 30, 31 and a sheet 32 holding the supports together.
  • Each support 30, 31 carries on one side one of the bearings for the shaft 26 with the saw blades.
  • On its other side, each support is provided with a round shaft 33 or 34, which extends along the associated support and is fixedly attached to this support.
  • These shafts are supported at their two ends in ball bushings 35, 36 and 37, 38, which are firmly fixed to the vertical stand part 22.
  • the movable plate 32 is connected via a set screw 39 to a disc motor 40, which is controlled by connecting lines 41 by a processor in such a way that the height of the saw blades is automatically changed in a predetermined manner depending on the position of the insulating material disc to be processed on the support rollers 23 .
  • a processor in which the shaft with the saw blades can be raised and lowered in the manner mentioned, the profile of the cooling duct elements can be changed as desired and adapted to the customer's requirements. This makes it possible to obtain the correct shape for a transformer winding with bent-out end sections in a relatively simple manner.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Insulating Of Coils (AREA)
  • Transformer Cooling (AREA)
  • Coil Winding Methods And Apparatuses (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Description

Die Erfindung betrifft einen mit Isolierflüssigkeit gekühlten Transformator oder entsprechend gekühlte Drossel gemäß dem Oberbegriff des Anspruches 1, ein Herstellungsverfahren für den Transformator oder die Drossel und eine Anordnung zur Durchführung eines solchen Verfahrens.The invention relates to a transformer cooled with insulating liquid or a correspondingly cooled choke according to the preamble of claim 1, a manufacturing method for the transformer or the choke and an arrangement for carrying out such a method.

In Transformatoren und Drosseln mit Band-oder Foliewicklungen kann eine starke Stromverdrängung zu den Rändern des Bandes hin auftreten, die einerseits hohe Zusatzverluste und andererseits eine starke örtliche Erwärmung an den Rändern des Bandes verursacht. Durch die Ausgangspunkt der vorliegenden Erfindung bildende DE-A-3 029 416 ist es bereits bekannt, die Stromverdrängung im Leiterband dadurch zu reduzieren, daß man das Band so formt, daß es in seinen Randbereichen einer doppeltgebogenen Fläche folgt. Dabei erzielt man das beste Resultat, wenn die Form des doppeltgebogenen Leiterbandes während des Wickelvorganges in bestimmter Weise variiert wird. Der radiale Abstand des Leiterbandes von der geometrischen Achse der Wicklung varriert bei solchen Wicklungen in achsialer Richtung und ist, zumindest für den radial äußeren Teil der Wicklung, an den achsialen Wicklungsenden am größten. Bei einer gleichmäßig dicken Metallfolie ist somit eine Ausfüllung erforderlich, um an den axialen Wicklungsenden die gewünschte trichterförmige Form zu erhalten. Es ist unter anderem aus dielektrischen Gründen wünschenswert, daß diese Ausfüllung aus elektrisch isolierendem Material besteht. Da ein solches Material eine schlechte Wärmeleitfähigkeit hat, muß die Ausfüllung in thermischen Symmetrieebenen liegen, d. h. entweder in der Mitte der Kühlkanäle oder in der Mitte zwischen zwei benachbarten Kühlkanälen, so daß die Wärmeleitung in radialer Richtung nicht behindert wird.In transformers and chokes with strip or film windings, a strong current displacement to the edges of the strip can occur, which on the one hand causes high additional losses and on the other hand causes strong local heating at the edges of the strip. From the starting point of the present invention DE-A-3 029 416 it is already known to reduce the current displacement in the conductor strip by shaping the strip in such a way that it follows a double-curved surface in its edge regions. The best result is achieved if the shape of the double-bent conductor strip is varied in a certain way during the winding process. The radial distance of the conductor strip from the geometric axis of the winding varies in the axial direction in the case of such windings and, at least for the radially outer part of the winding, is greatest at the axial winding ends. In the case of a uniformly thick metal foil, filling is required in order to obtain the desired funnel-shaped shape at the axial winding ends. It is desirable, inter alia for dielectric reasons, that this fill be made of an electrically insulating material. Since such a material has poor thermal conductivity, the fill must lie in thermal planes of symmetry, i. H. either in the middle of the cooling channels or in the middle between two adjacent cooling channels, so that the heat conduction in the radial direction is not hindered.

Bei Wicklungen mit Kühlkanalelementen der an sich vorteilhaften Ausführung, die aus einer gleichmäßig dicken, biegsamen Isoliermaterialscheibe besteht, in der auf beiden Seiten Nuten für die Kühlflüssigkeitszirkulation eingearbeitet sind (EP-A-40382) ist es jedoch schwer, im Anschluß an die Kühlkanäle separate Füllmittel in der oben genannten Art anzubringen. Das Einlegen eines separaten Füllmittels verursacht ganz allgemein Probleme bei der Plazierung des Füllmittels, da die Lage des Füllmittels sehr präzise sein muß. Ein solches Einlegen erfordert einen hohen handwerklichen Aufwand, der zu hohen Herstellungskosten führt.In the case of windings with cooling duct elements of the embodiment which is advantageous per se, which consists of a uniformly thick, flexible insulating material disc in which grooves for the cooling liquid circulation are incorporated on both sides (EP-A-40382), it is difficult, however, to use separate fillers following the cooling ducts to be attached in the manner mentioned above. The insertion of a separate filler generally causes problems when placing the filler, since the position of the filler must be very precise. Such insertion requires a high level of manual work, which leads to high manufacturing costs.

Der Erfindung liegt die Aufgabe zugrunde, einen Transformator oder eine Drossel der eingangs genannten Art so weiter zu entwickeln, daß das aufgezeigte Problem bei der Anbringung von Füllmittel in den axialen Endbereichen der Wicklung in einfacher Weise gelöst ist.The invention has for its object to develop a transformer or a choke of the type mentioned so that the problem shown in the application of filler in the axial end regions of the winding is solved in a simple manner.

Zur Lösung dieser Aufgabe wird ein Transformator oder eine Drossel nach dem Oberbegriff des Anspruches 1 mit den im kennzeichnenden Teil des Anspruches 1 genannten Merkmalen versehen.To solve this problem, a transformer or a choke is provided according to the preamble of claim 1 with the features mentioned in the characterizing part of claim 1.

Vorteilhafte Weiterbildungen des Transformators oder der Drossel sind in den Ansprüchen 2 und 3 genannt. Ein Verfahren zur Herstellung eines Transformators oder einer Drossel gemäß der Erfindung ist erfindungsgemäß durch die im Anspruch 4 genannten Merkmale gekennzeichnet.Advantageous further developments of the transformer or the choke are mentioned in claims 2 and 3. A method for producing a transformer or a choke according to the invention is characterized according to the invention by the features mentioned in claim 4.

Eine Anordnung zur Durchführung dieses Verfahrens ist durch die in den Ansprüchen 5 und 6 genannten Merkmale gekennzeichnet.An arrangement for performing this method is characterized by the features mentioned in claims 5 and 6.

Die Erfindung beruht auf der Idee, das eingangs genannte Füllmittel in die Kühlkanalelemente zu integrieren.The invention is based on the idea of integrating the filler mentioned at the beginning into the cooling channel elements.

Das Kühlkanalelement wird vorzugsweise aus einer zunächst ebenen, rechteckigen Preßspannscheibe hergestellt, die auf ihrer einen Breitseite mit einem solchen Profil versehen wird, daß die Scheibe in den Bereichen längs zweier gegenüberliegender paralleler Schmalseiten eine in Richtung auf diese Schmalseiten zunehmende Dicke hat, die so bemessen ist, daß die Randabschnitte des Leiterbandes die gewünschte herausgebogene Form bekommen.The cooling duct element is preferably made from an initially flat, rectangular compression washer, which is provided on one broad side with such a profile that the washer in the areas along two opposite parallel narrow sides has an increasing thickness towards these narrow sides, which is so dimensioned that the edge sections of the conductor strip get the desired bent shape.

Das Herstellen der Kühlkanalelemente erfolgt vorzugsweise mittels einer Sägemaschine, die mit mehreren Sägeblättern mit zwei verschiedenen Durchmessern arbeitet. Die Sägeblätter sind abwechselnd mit den beiden vorkommenden Durchmessern koaxial nebeneinander auf einer Welle angeordnet, die im Verhältnis zu einer Stützebene, auf der die Isoliermaterialscheiben für die Kühlkanalelemente vorgeschoben werden, gehoben und gesenkt werden kann. Die Höhenlage der Welle wird dabei in Abhängigkeit von der Lage der Isoliermaterialscheibe auf der Stützebene gesteuert. Diese Steuerung erfolgt vorzugsweise mit Hilfe eines Prozessors. Durch dieses Verfahren kann das Profil des Kühlkanalelementes beliebig geändert werden und allen gewünschten Formen angepaßt werden. Beim Wickeln der Wicklung braucht man dann nur die Reihenfolge der Kühlkanalelemente zu berücksichtigen um die gewünschte Form der Wicklung zu erhalten.The cooling duct elements are preferably produced by means of a sawing machine which works with a plurality of saw blades with two different diameters. The saw blades are arranged alternately with the two existing diameters coaxially next to one another on a shaft which can be raised and lowered in relation to a support plane on which the insulating material disks for the cooling channel elements are advanced. The height of the shaft is controlled depending on the position of the insulating material disc on the support level. This control is preferably carried out with the aid of a processor. With this method, the profile of the cooling channel element can be changed as desired and can be adapted to all desired shapes. When winding the winding, one only needs to take into account the sequence of the cooling channel elements in order to obtain the desired shape of the winding.

Anhand der in den Figuren gezeigten Ausführungsbeispiele soll die Erfindung näher erläutert werden. Es zeigen :

  • Figur 1 schematisch einen Schnitt durch einen Teil eines Transformators gemäß der Erfindung,
  • Figur 2 in Seitenansicht ein Ausführungsbeispiel eines Kühlkanalelementes für einen Transformator gemäß Figur 1,
  • Figur 3 einen Schnitt durch das Kühlkanalelement längs der Linie 111-111 in Figur 2,
  • Figur 4 einen Schnitt durch das Kühlkanalelement längs der Linie IV-IV in Figur 2,
  • Figur 5 in Seitenansicht das Kühlkanalelement nach Figur 2 nach dem Weichmachen seiner dickeren Randbereiche,
  • Figur 6 schematisch in Seitenansicht eine Sägemaschine zum Sägen von Kühlkanalelementen nach Art der Figuren 2 bis 5,
  • Figur 7 eine Vorderansicht des oberen Teils der Sägemaschine gemäß Figur 6.
The invention will be explained in more detail with reference to the exemplary embodiments shown in the figures. Show it :
  • FIG. 1 shows schematically a section through part of a transformer according to the invention,
  • FIG. 2 shows a side view of an exemplary embodiment of a cooling duct element for a transformer according to FIG. 1,
  • 3 shows a section through the cooling channel element along the line 111-111 in FIG. 2,
  • FIG. 4 shows a section through the cooling duct element along the line IV-IV in FIG. 2,
  • FIG. 5 shows a side view of the cooling duct element according to FIG. 2 after its thicker edge areas have been softened,
  • FIG. 6 schematically, in side view, a sawing machine for sawing cooling duct elements in the manner of FIGS. 2 to 5,
  • FIG. 7 shows a front view of the upper part of the sawing machine according to FIG. 6.

Figur 1 zeigt einen Teil eines Transformatorkerns mit Schenkel 1 sowie oberem und unterem Joch 2 bzw. 3. Konzentrisch um den Schenkel 1 sind eine Innenwicklung 4 und eine Außenwicklung 5 angeordnet. Die Wicklungen bestehen aus in vielen Windungen gewickelter Aluminium- oder Kupferfolie 6 bzw. 7, deren Dicke zwischen 0,01 und 3 mm liegen kann. Zwischen den Windungen liegt ein Film aus geeignetem Isoliermaterial, beispielsweise Poly- äthylenglykolterephtalat, dessen Dicke beispielsweise zwischen 0,01 und 0,1 mm liegen kann. Die Innenwicklung 4 ist auf einen Wicklungszylinder 8 gewickelt, der beispielsweise aus glasfaserarmiertem Polyester oder metallischem Material, wie z. B. Aluminium, bestehen kann. Die Außenwicklung 5 ist auf die Innenwicklung mit einem zwischenliegenden Isolationsspalt gewickelt, in dem Rippen 9 aus Preßspan, Bakelit oder glasfaserarmiertem Polyester parallel zur Achse der Wicklungen angeordnet sind. Der Eisenkern des Transformators mit den Wicklungen ist in einem mit Isolierflüssigkeit, z. B. Öl, gefüllten Transformatorkessel angeordnet. Die Wicklungen werden dadurch gekühlt, daß die Isolierflüssigkeit durch Kühlkanäle in den Wicklungen zirkuliert, die von Kühlkanalelementen gebildet werden, welche zwischen je zwei benachbarten Windungen des Leiterbandes in verschiedenen radialen Abständen von der geometrischen Achse der Wicklungen angeordnet sind. In Figur 1 werden nur die Kühlkanalelemente 10 bis 14 in der Außenwicklung 5 gezeigt.Figure 1 shows part of a transformer core with leg 1 and upper and lower yoke 2 and 3. Concentrically around the leg 1, an inner winding 4 and an outer winding 5 are arranged. The windings consist of aluminum or copper foil 6 or 7 wound in many turns, the thickness of which can be between 0.01 and 3 mm. Between the turns there is a film of suitable insulating material, for example polyethylene glycol terephthalate, the thickness of which can be, for example, between 0.01 and 0.1 mm. The inner winding 4 is wound on a winding cylinder 8, for example made of glass fiber reinforced polyester or metallic material such as. B. aluminum. The outer winding 5 is wound on the inner winding with an intermediate insulation gap in which ribs 9 made of pressboard, bakelite or glass fiber reinforced polyester are arranged parallel to the axis of the windings. The iron core of the transformer with the windings is in a with insulating liquid, for. B. oil, filled transformer tank. The windings are cooled in that the insulating liquid circulates through cooling channels in the windings, which are formed by cooling channel elements which are arranged between two adjacent turns of the conductor strip at different radial distances from the geometric axis of the windings. In Figure 1, only the cooling channel elements 10 to 14 are shown in the outer winding 5.

Die Figuren 2 bis 5 zeigen den Aufbau des Kühlkanalelementes 13. Die übrigen Kühlkanaielemente in der Außenwicklung sind in gleicher Weise aufgebaut. Das gezeigte Kühlkanalelement 13 ist hergestellt aus einer rechteckigen, ursprünglich ebenen Preßspanscheibe mit einer Dicke h von beispielsweise 8 mm, einer Breite von beispielsweise 0,5 m und einer Länge, die mindestens die Breite der Leiterfolie, beispielsweise 2 m, hat. Die eine Breitseite der Preßspanscheibe ist derart auf Profil gearbeitet, z. B. gesägt, daß die Scheibe eine nach ihren beiden Schmalseiten 15, 16 hin zunehmende Dicke bekommt. Auf beiden Breitseiten der Scheibe sind parallele Nuten 17 eingearbeitet, welche Kühlkanäle bilden. Die Nuten 17 auf den beiden Breitseiten der Scheibe liegen sich paarweise genau gegenüber und reichen von einer Schmalseite 15, 16 der Scheibe zur anderen. Das verbliebene Material an den Seiten der Nuten 17 bildet die Distanzelemente 18, während das verbliebene Material am Boden der Nuten die Verbindungsstücke 19 bildet. Um das Biegen der Kühlkanalelemente bei ihrer Anbringung in der Wicklung zu erleichtern, sind die dickeren Randbereiche der Elemente durch Anbringung von durchgehenden Nuten 20 an den Enden jedes zweiten Verbindungsstückes 19 aufgefranst. Diese Randbereiche werden außerdem dadurch weichgemacht, daß sie durch Weichmacherwalzen geschoben werden, wonach sie leicht die in Figur 5 gezeigte Form annehmen können.Figures 2 to 5 show the structure of the cooling duct element 13. The other cooling duct elements in the outer winding are constructed in the same way. The cooling duct element 13 shown is produced from a rectangular, originally flat clamping chip with a thickness h of, for example, 8 mm, a width of, for example, 0.5 m and a length which has at least the width of the conductor foil, for example 2 m. One broadside of the press washer is worked on profile, z. B. sawn that the disk gets a thickness increasing towards its two narrow sides 15, 16. Parallel grooves 17 are formed on both broad sides of the disk and form cooling channels. The grooves 17 on the two broad sides of the disk lie exactly opposite one another in pairs and extend from one narrow side 15, 16 of the disk to the other. The remaining material on the sides of the grooves 17 forms the spacer elements 18, while the remaining material on the bottom of the grooves forms the connecting pieces 19. In order to facilitate the bending of the cooling channel elements when they are installed in the winding, the thicker edge regions of the elements are frayed by the provision of continuous grooves 20 at the ends of each second connecting piece 19. These edge areas are also softened by pushing them through softening rollers, after which they can easily assume the shape shown in FIG.

Die Figuren 6 und 7 zeigen schematisch eine Säge zum Sägen von Kühlkanalelementen der in den Figuren 2 bis 5 gezeigten Art. Die Säge hat ein festes Stativ mit einem horizontalen Stativteil 21 und einem hierauf angeordneten vertikalen Stativteil 22. In dem horizontalen Stativteil 21 sind mehrere Stützrollen 23 gelagert, auf welchen die für die Herstellung von Kühlkanalelementen vorgesehenen Isolierscheiben beim Sägen vorgeschoben werden. Die Säge ist mit einer großen Anzahl von Sägeblättern 24, 25 versehen, die zwei verschiedene Durchmesser haben. Die Sägeblätter sind koaxial nebeneinander auf einer Welle 26 befestigt, auf der auch eine Riemenscheibe 27 sitzt, über die die Welle mittels eines Keilriemens 28 von einem Motor 29 angetrieben wird. Die einen von zwei Durchmessern aufweisenden Sägeblätter sind abwechselnd auf der Welle 26 angebracht, so daß benachbarte Sägeblätter 24, 25 stets verschiedene Durchmesser haben. Die Welle 26 ist in einem auf dem vertikalen Stativteil 22 vertikal verschiebbaren Halter gelagert. Dieser Halter umfaßt zwei vertikale Träger 30, 31 und ein die Träger zusammenhaltendes Blech 32. Jeder Träger 30, 31 trägt an seiner einen Seite eines der Lager für die Welle 26 mit den Sägeblättern. An seiner anderen Seite ist jeder Träger mit einer runden Welle 33 bzw. 34 versehen, die sich längs des zugehörigen Trägers erstreckt und an diesem Träger fest fixiert ist. Diese Wellen sind an ihren beiden Enden in Kugelbuchsen 35, 36 bzw. 37, 38 gelagert, die an dem vertikalen Stativteil 22 fest fixiert sind.FIGS. 6 and 7 schematically show a saw for sawing cooling duct elements of the type shown in FIGS. 2 to 5. The saw has a fixed stand with a horizontal stand part 21 and a vertical stand part 22 arranged thereon. In the horizontal stand part 21 there are several support rollers 23 mounted on which the insulating disks provided for the production of cooling channel elements are pushed forward during sawing. The saw is provided with a large number of saw blades 24, 25, which have two different diameters. The saw blades are fastened coaxially next to one another on a shaft 26, on which a pulley 27 is also seated, via which the shaft is driven by a motor 29 by means of a V-belt 28. The one of two diameters saw blades are alternately attached to the shaft 26, so that adjacent saw blades 24, 25 always have different diameters. The shaft 26 is mounted in a holder which is vertically displaceable on the vertical stand part 22. This holder comprises two vertical supports 30, 31 and a sheet 32 holding the supports together. Each support 30, 31 carries on one side one of the bearings for the shaft 26 with the saw blades. On its other side, each support is provided with a round shaft 33 or 34, which extends along the associated support and is fixedly attached to this support. These shafts are supported at their two ends in ball bushings 35, 36 and 37, 38, which are firmly fixed to the vertical stand part 22.

Das bewegliche Blech 32 ist über eine Stellschraube 39 mit einem Scheibenmotor 40 verbunden, der über Anschlußleitungen 41 durch einen Prozessor derart gesteuert wird, daß die Höhenlage der Sägeblätter in Abhängigkeit von der Lage der zu bearbeitenden Isoliermaterialscheibe auf den Stützrollen 23 automatisch auf vorbestimmte Weise geändert wird. Mit einer Säge, bei der die Welle mit den Sägeblättern in der genannten Weise gehoben und gesenkt werden kann, kann das Profil der Kühlkanalelemente beliebig geändert und den Kundenwünschen angepaßt werden. Dadurch kann man auf verhältnismäßig einfache Weise die richtige Form für eine Transformatorwicklung mit herausgebogenen Endabschnitten erhalten.The movable plate 32 is connected via a set screw 39 to a disc motor 40, which is controlled by connecting lines 41 by a processor in such a way that the height of the saw blades is automatically changed in a predetermined manner depending on the position of the insulating material disc to be processed on the support rollers 23 . With a saw in which the shaft with the saw blades can be raised and lowered in the manner mentioned, the profile of the cooling duct elements can be changed as desired and adapted to the customer's requirements. This makes it possible to obtain the correct shape for a transformer winding with bent-out end sections in a relatively simple manner.

Claims (6)

1. Transformer or reactor cooled by insulating liquid comprising a core made of magnetic material and having at least one leg (1) and yokes (2, 3), at least one winding (5) arranged substantially concentrically on said leg and consisting of a plurality of superimposed turns of a sheet which is built up of a metal foil and an insulating film on at least one side of said metal foil, whereby at least a portion of the turns of said sheet are formed in such a way that the marginal portions of the sheet are in a different distance from the geometric axis of the winding than the middle portion of the sheet for the respective turns, and comprising at least one cooling channel element (13) arranged between two successive turns or parts of turns of the winding or within the innermost turn of the winding, which cooling channel element (13) comprises a plurality of connected together, elongated, parallel spacer elements (18) disposed in laterally (circumferential direction) spaced relationship, which spacer elements keep the two tu rns of the sheet or the parts of these two turns resp. apart from each other in such a way that between these turns or inside of the innermost turn of the sheet resp. channels (17) are formed to transport insulating liquid from one axial end face of the sheet-wound winding to the other end face, characterized in that the thickness of the spacer element (19) of the cooling channel element (13) increases towards the axial end faces of the winding.
2. Transformer or reactor according to claim 1, characterized in that the spacer elements (18) are connected with one another in lateral direction (circumferential direction) by connecting means (19) being arranged in a spaced relationship to the two adjacent turns, preferably in the middle between the two adjacent turns.
3. Transformer or reactor according to claim 1 or 2, characterized in that the cooling channel element (13) consists of a flexible sheet of insulating material in which grooves (17) are provided on both flat sides, whereby the material remaining at the sides of the grooves constitutes said spacer elements (18) and the material remaining at the bottom of the grooves constitutes the connecting means (19).
4. Method of manufacturing a transformer or a reactor according to any of claim 1 to 3, characterized in that the cooling channel element (13) are manufactured from a rectangular plate of press board by providing one flat side of the plate, e. g. by sawing, with a profile in such a way that the plate in regions along two opposed parallel side edges is given a thickness which increases towards said side edges, that on both sides of the plate parallel grooves (17) are provided, e. g. by sawing, for cooling channels, extending from one to the other of said side edges, and that the two thicker side edge regions of the plate are softened by mechanical treatment.
5. Arrangement for carrying out the method according to claim 4, characterized in that for processing plates of insulating material into cooling channel elements a plurality of saw blades (24, 25) with two different diameters are mounted alternately and coaxially side by side on a shaft (26), that said shaft (26) is movable up and down in relation to a supporting plane, on which the plates of insulating material are conveyed, and that elements are provided for automatic control of the altitude of said shaft (26) in a predetermined manner in dependence on the position of the plate of insulating material on said supporting plane.
6. Arrangement according to claim 5, characterized in that said shaft (26) with said saw blades (24, 25) is journalled in a holder displacably arranged on a stand (30, 31, 32) connected with an adjusting screw (39), which is controlled by a processor.
EP82101098A 1981-02-24 1982-02-15 Transformer or inductance cooled by insulating liquid, method and device for manufacturing them Expired EP0058905B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8101197 1981-02-24
SE8101197A SE428979B (en) 1981-02-24 1981-02-24 WITH INSULATED COOL TRANSFORMER OR REACTOR

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EP0058905A1 EP0058905A1 (en) 1982-09-01
EP0058905B1 true EP0058905B1 (en) 1984-10-17

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EP (1) EP0058905B1 (en)
JP (1) JPS57155711A (en)
CA (1) CA1182876A (en)
DE (1) DE3260979D1 (en)
NO (1) NO820539L (en)
SE (1) SE428979B (en)
ZA (1) ZA821169B (en)

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SE469301B (en) * 1991-10-23 1993-06-14 Asea Brown Boveri TRANSFORMER OR REACTOR
US6103359A (en) * 1996-05-22 2000-08-15 Jsr Corporation Process and apparatus for manufacturing an anisotropic conductor sheet and a magnetic mold piece for the same
US6163241A (en) * 1999-08-31 2000-12-19 Stupak, Jr.; Joseph J. Coil and method for magnetizing an article
JP4728015B2 (en) * 2005-03-02 2011-07-20 鈴野化成株式会社 Stick-shaped cosmetic material feeding container
US9514878B2 (en) * 2013-11-22 2016-12-06 Tamura Corporation Coil and manufacturing method for same, and reactor

Citations (1)

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Publication number Priority date Publication date Assignee Title
DE3029416A1 (en) * 1979-08-14 1981-03-26 ASEA AB, Västerås POWERFUL TRANSFORMER OR THROTTLE

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US3056071A (en) * 1959-02-12 1962-09-25 William R Baker Electrical coil structure
GB962222A (en) * 1959-10-29 1964-07-01 English Electric Co Ltd Improvements in or relating to inductive windings
FR1411081A (en) * 1964-07-08 1965-09-17 Comp Generale Electricite Improvements to alternative windings
DE1948848A1 (en) * 1969-09-26 1971-04-01 Siemens Ag Small,high voltage, wound components
US3748616A (en) * 1972-03-24 1973-07-24 Ite Imperial Corp Transformer winding structure using corrugated spacers
CH598679A5 (en) * 1976-10-29 1978-05-12 Bbc Brown Boveri & Cie
DE2753055C3 (en) * 1977-11-28 1980-09-18 Siemens Ag, 1000 Berlin Und 8000 Muenchen Method for building a superconducting magnet winding
SE417466B (en) * 1978-11-09 1981-03-16 Asea Ab power transformer

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
DE3029416A1 (en) * 1979-08-14 1981-03-26 ASEA AB, Västerås POWERFUL TRANSFORMER OR THROTTLE

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SE8101197L (en) 1982-08-25
DE3260979D1 (en) 1984-11-22
NO820539L (en) 1982-08-25
JPS57155711A (en) 1982-09-25
ZA821169B (en) 1983-01-26
US4477790A (en) 1984-10-16
EP0058905A1 (en) 1982-09-01
CA1182876A (en) 1985-02-19
SE428979B (en) 1983-08-01

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