EP0080430A1 - Transformer or choke coil - Google Patents

Transformer or choke coil Download PDF

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Publication number
EP0080430A1
EP0080430A1 EP82710053A EP82710053A EP0080430A1 EP 0080430 A1 EP0080430 A1 EP 0080430A1 EP 82710053 A EP82710053 A EP 82710053A EP 82710053 A EP82710053 A EP 82710053A EP 0080430 A1 EP0080430 A1 EP 0080430A1
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EP
European Patent Office
Prior art keywords
transformer
choke coil
polymer films
winding
metal foil
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Granted
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EP82710053A
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German (de)
French (fr)
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EP0080430B1 (en
Inventor
Anders Björklund
Marja Dipl.-Ing. Widell
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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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/323—Insulation between winding turns, between winding layers
    • 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

Definitions

  • the invention relates to a transformer or a choke coil according to the preamble of claim 1.
  • a tape winding for a transformer or choke coil normally consists of a plurality of turns of a tape composed of a metal foil layer and an insulation layer, the insulation layer comprising a polymer film and cellulose paper. After drying, the tape winding is impregnated with an insulating liquid so that all voids in the tape winding are filled and a glow is avoided. Since the tape winding can have a width of a few meters and can be wound with pretension, drying and impregnation are complicated and time-consuming work processes. The use of paper in turn insulation is inherently undesirable because it greatly helps to lengthen the drying process of the tape winding and because it increases the size of a given power transformer. So far, it has not been possible to do without the use of paper, since it is not possible to achieve sufficient impregnation of the tape winding without its ability to suck insulating liquid into the inner parts of the winding.
  • the invention has for its object to develop a transformer or an inductor of the type mentioned, in which no paper is used for winding insulation in the tape winding, but still a good impregnation of the tape winding can be achieved.
  • the invention not only makes it possible to dispense with paper in the winding insulation, but also reduces the risk of damage to the winding, which on the one hand can be caused by metal particles which enter the winding during manufacture, and on the other hand by plastic deformation of Polymer material can be caused in the winding insulation.
  • metal particles such as particles of iron, copper or aluminum
  • Such particles occurring in workshops often have sharp edges which can damage the insulation and - if they are large enough - can cut through the insulation between two turns, so that a short circuit can occur between the metal foil conductors of adjacent turns either immediately or after a certain operating time.
  • the metal foil for example a copper or aluminum foil, normally has a thickness of 5 to 3000 ⁇ m and preferably a thickness of 50 to 1000 ⁇ m.
  • the polymer film should be able to withstand a permanent temperature of at least 90 ° C.
  • Polyethylene glycol terephthalate, polybutylene glycol terephthalate, polycarbonate, polyimide, cellulose acetate and polyamide can be mentioned as examples of suitable polymers in the film.
  • a suitable thickness of the film is 5 to 200 microns, preferably 10 to 100 microns.
  • the polymer film is preferably wider than the metal foil, so that the polymer film protrudes beyond the edges of the metal foil, so that electrical flashovers between foil turns or along the winding edge are prevented.
  • a film made of polyethylene glycol terephthalate is particularly preferred, since such a film fulfills the necessary requirements in terms of thermal, mechanical and electrical aspects as well as with regard to its resistance to transformer oil and other insulating liquids used in transformers.
  • the filler can include grains of silicon dioxide, aluminum oxide, kaolin, dolomite and lime. Because the grains consist of inorganic material, they have sufficient hardness to reduce the risk of damage from metal particles in the winding and also to reduce the risk that the predetermined distance between adjacent metal foil turns in the winding will not be maintained due to plastic deformation of the polymer becomes.
  • the filler content is 0.5-5%, preferably 0.5-2.5%, of the total volume occupied by the polymer and the filler.
  • At least one Part of the grains preferably at least 25% of the total volume occupied by the grains, has a size of more than 1 ⁇ m and preferably a size of 2 to 15 ⁇ m, and preferably at least 5% of the total volume of the grains have a size of at least 5 ⁇ m.
  • Some of the grains can be up to at least 25 ⁇ m in size.
  • the irregular increases can have different heights. Most of the material contained in the ridges is preferably contained in such ridges, the height of which is between 0.5 and 5 ⁇ m, based on the lowest level on the surface of the film.
  • Figures 1 and 2 show a leg 10a and parts of the upper and lower yokes 10b and 10c of an iron core for a power transformer.
  • the leg 10a is surrounded by an inner winding 11 designed as a low-voltage winding and an outer winding 12 designed as a high-voltage winding.
  • Both windings are tape windings that are wound with a bias.
  • Both windings are arranged coaxially to one another, a cylindrical ring-shaped space being formed between them, in which ribs 13 made of pressboard, bakelite or glass fiber-reinforced polyester are arranged parallel to the longitudinal axis of the windings.
  • the inner winding is wound on a forme cylinder 14.
  • the windings 11 and 12 are made up of many turns of a strip made of an aluminum foil 15 and of two films 16 and 17 made of polyethylene glycol terephthalate, which contains 0.9% by volume silicon dioxide in the form of grains homogeneously distributed in the film, the largest grains of which are one size of 10 ⁇ m. 80% of the total volume of the grains have a size of at least 2 ⁇ m and 20% of the total volume of the grains have a size of at least 5 ⁇ m. Alternatively, the largest grains can be approximately 25 ⁇ m in size.
  • the polymer films have unevenness on the surface in the form of elevations 18, the height for the main part of these elevations being in the range between 0.5 and 5 ⁇ m.
  • the thickness of the aluminum foil is 300 ⁇ m, and the thickness of each of the polymer films is 25 ⁇ m.
  • the spaces 19 between the mutually facing surfaces of the metal foil and a polymer film or two polymer films are connected to the space 21 outside the end faces 22 and 23 or 24 and 25 of the windings 11 and 12.
  • the windings are vacuum-dried at elevated temperature and then vacuum-impregnated with a suitable insulating liquid, such as, for example, transformer oil, or a suitable insulating gas, such as, for example, SF 6 .
  • a suitable insulating liquid such as, for example, transformer oil
  • a suitable insulating gas such as, for example, SF 6 .

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

1. Transformer or reactor with at least one sheet winding (11, 12) built up of several radially coiled turns of a sheet comprising a metal foil (15) and at least two polymer films (16, 17), the metal foil acting as conductor and the polymer films acting as insulation between the conductors of the winding, with spaces (19) between each other facing surfaces of the metal foil and the polymer film and/or between each other facing surfaces of two polymer films, which spaces communicate with the space (21) outside of said sheet winding via the end faces (22, 23, 24, 25) of the sheet winding, characterized in that the polymer films comprise, embedded therein, homogeneously distributed grains of an inorganic filler material, which grains create irregular elevations on the polymer films.

Description

Die Erfindung betrifft einen Transformator oder eine Drosselspule gemäß dem Oberbegriff des Anspruches 1.The invention relates to a transformer or a choke coil according to the preamble of claim 1.

Eine Bandwicklung für einen Transformator oder eine Drosselspule besteht normalerweise aus einer Vielzahl von Windungen eines Bandes, das aus einer Metallfolienschicht und einer Isolationsschicht zusammengesetzt ist, wobei die Isolationsschicht einen Polymerfilm und Zellulosepapier umfaßt. Die Bandwicklung wird nach dem Trocknen mit einer Isolierflüssigkeit imprägniert, damit alle in der Bandwicklung vorhandenen Hohlräume ausgefüllt werden und so ein Glimmen vermieden wird. Da die Bandwicklung eine Breite von einigen Metern haben kann und mit Vorspannung gewickelt sein kann, handelt es sich beim Trocknen und Imprägnieren um komplizierte und zeitraubende Arbeitsvorgänge. Die Anwendung von Papier in der Windungsisolation ist an sich unerwünscht, weil es in hohem Maße dazu beiträgt, den Trocknungsvorgang der Bandwicklung zu verlängern, und weil es die Abmessungen eines Transformators gegebener Leistung vergrößert. Man konnte auf den Einsatz von Papier jedoch bisher nicht verzichten, da es ohne seine Fähigkeit, Isolierflüssigkeit in die inneren Teile der Wicklung zu saugen, nicht möglich ist, eine ausreichende Imprägnierung der Bandwicklung zu erreichen.A tape winding for a transformer or choke coil normally consists of a plurality of turns of a tape composed of a metal foil layer and an insulation layer, the insulation layer comprising a polymer film and cellulose paper. After drying, the tape winding is impregnated with an insulating liquid so that all voids in the tape winding are filled and a glow is avoided. Since the tape winding can have a width of a few meters and can be wound with pretension, drying and impregnation are complicated and time-consuming work processes. The use of paper in turn insulation is inherently undesirable because it greatly helps to lengthen the drying process of the tape winding and because it increases the size of a given power transformer. So far, it has not been possible to do without the use of paper, since it is not possible to achieve sufficient impregnation of the tape winding without its ability to suck insulating liquid into the inner parts of the winding.

Der Erfindung liegt die Aufgabe zugrunde, einen Transformator oder eine Drosselspule der eingangs genannten Art zu entwickeln, bei der in der Bandwicklung kein Papier für die Windungsisolation verwendet wird, trotzdem aber eine gute Imprägnierung der Bandwicklung erreichbar ist.The invention has for its object to develop a transformer or an inductor of the type mentioned, in which no paper is used for winding insulation in the tape winding, but still a good impregnation of the tape winding can be achieved.

Zur Lösung dieser Aufgabe wird ein Transformator oder eine Drosselspule der eingangs genannten Art vorgeschlagen, die erfindungsgemäß die im kennzeichnenden Teil des Anspruches 1 genannten Merkmale hat.To solve this problem, a transformer or a choke coil of the type mentioned is proposed, which according to the invention has the features mentioned in the characterizing part of claim 1.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen genannt.Advantageous refinements and developments of the invention are mentioned in the subclaims.

Durch die Erfindung wird nicht nur der Verzicht auf Papier in der Windungsisolation ermöglicht, sondern es wird auch die Gefahr einer Beschädigung der Wicklung vermindert, die einerseits durch Metallpartikel verursacht werden kann, welche bei der Fertigung in die Wicklung gelangen, und andererseits durch plastische Verformung von Polymermaterial in der Wicklungsisolation verursacht werden kann. Bei der werkstattmäßigen Fertigung einer Wicklung ist es praktisch unmöglich, das Eindringen kleiner Metallpartikel, wie z.B. Partikel aus Eisen, Kupfer oder Aluminium, aus der Umgebung in die Wicklung zu vermeiden. Derartige in Werkstätten vorkommende Partikel haben oft scharfe Kanten, welche die Isolation beschädigen können und - wenn sie groß genug sind - die Isolation zwischen zwei Windungen durchschneiden können, so daß zwischen den Metallfolienleitern benachbarter Windungen entweder sofort oder nach einer gewissen Betriebszeit ein Kurzschluß auftreten kann. Weil auch sehr kleine Partikel, die etwa in einer der Isolationsdicke entsprechenden Größenordnung liegen, die bedeutend unter 100 µm liegen kann, Schäden der vorgenannten Art verursachen können, ist es in der Praxis außerordentlich schwierig, und zwar auch bei Anwendung kostspieliger Reinigungsanlagen, die Beschädigung der Wicklung durch Metallpartikel völlig zu verhindern. Eine plastische Verformung von Polymermaterial in der Wicklung kann zu einer Verkleinerung der Isolationsabstände führen und damit zu größeren Schwierigkeiten bei der Erreichung einer vollständigen Imprägnierung der Wicklung.The invention not only makes it possible to dispense with paper in the winding insulation, but also reduces the risk of damage to the winding, which on the one hand can be caused by metal particles which enter the winding during manufacture, and on the other hand by plastic deformation of Polymer material can be caused in the winding insulation. When manufacturing a winding in the workshop, it is practically impossible to prevent small metal particles, such as particles of iron, copper or aluminum, from penetrating into the winding from the surroundings. Such particles occurring in workshops often have sharp edges which can damage the insulation and - if they are large enough - can cut through the insulation between two turns, so that a short circuit can occur between the metal foil conductors of adjacent turns either immediately or after a certain operating time. Because even very small particles, which are about the same size as the insulation thickness, which can be significantly less than 100 µm, can cause damage of the aforementioned type, it is extremely difficult in practice, even when using expensive cleaning systems, the damage Prevent damage to the winding by metal particles. Plastic deformation of the polymer material in the winding can lead to a reduction in the insulation distances and thus to greater difficulties in achieving complete impregnation of the winding.

In einer Bandwicklung hat die Metallfolie, beispielsweise eine Kupfer- oder Aluminiumfolie, normalerweise eine Dicke von 5 bis 3000 µm und vorzugsweise eine Dicke von 50 bis 1000 µm. Der Polymerfilm soll einer Dauertemperatur von mindestens 90°C standhalten können. Als Beispiel für geeignete Polymere im Film können Polyäthylenglykolterephtalat, Polybutylenglykolterephtalat, Polycarbonat, Polyimid, Zelluloseazetat und Polyamid genannt werden. Eine zweckmäßige Dicke des Films sind 5 bis 200 µm, vorzugsweise 10 bis 100 µm. Der Polymerfilm ist vorzugsweise breiter als die Metallfolie, so daß der Polymerfilm über die Ränder der Metallfolie hinausragt, so daß elektrische Überschläge zwischen Folienwindungen oder längs der Wicklungskante verhindert werden. Besonders wird ein Film aus Polyäthylenglykolterephtalat bevorzugt, da ein solcher Film die notwendigen Anforderungen in thermischer, mechanischer und elektrischer Hinsicht sowie hinsichtlich seiner Beständigkeit gegen Transformatorenöl und anderen in Transformatoren verwendeten Isolierflüssigkeiten erfüllt.In a tape winding, the metal foil, for example a copper or aluminum foil, normally has a thickness of 5 to 3000 μm and preferably a thickness of 50 to 1000 μm. The polymer film should be able to withstand a permanent temperature of at least 90 ° C. Polyethylene glycol terephthalate, polybutylene glycol terephthalate, polycarbonate, polyimide, cellulose acetate and polyamide can be mentioned as examples of suitable polymers in the film. A suitable thickness of the film is 5 to 200 microns, preferably 10 to 100 microns. The polymer film is preferably wider than the metal foil, so that the polymer film protrudes beyond the edges of the metal foil, so that electrical flashovers between foil turns or along the winding edge are prevented. A film made of polyethylene glycol terephthalate is particularly preferred, since such a film fulfills the necessary requirements in terms of thermal, mechanical and electrical aspects as well as with regard to its resistance to transformer oil and other insulating liquids used in transformers.

Bei dem Füllmittel kann es sich u.a. um Körner aus Siliziumdioxyd, Aluminiumoxyd, Kaolin, Dolomit und Kalk handeln. Dadurch, daß die Körner aus anorganischem Material bestehen, haben sie eine ausreichende Härte, um die Beschädigungsgefahr durch Metallpartikel in der Wicklung zu verringern sowie auch die Gefahr zu verringern, daß durch plastische Verformung des Polymers der vorgegebene Abstand zwischen benachbarten Metallfolienwindungen in der Wicklung nicht eingehalten wird. Der Gehalt an Füllmittel beträgt 0,5 - 5 %, vorzugsweise 0,5 - 2,5 %,des vom Polymer und dem Füllmittel eingenommenen Gesamtvolumens. Wenigstens ein Teil der Körner, vorzugsweise mindestens 25 % des von den Körnern eingenommenen Gesamtvolumens, hat eine Größe von mehr als 1 µm und vorzugsweise eine Größe von 2 bis 15 µm, und vorzugsweise wenigstens 5 % des Gesamtvolumens der Körner haben eine Größe von wenigstens 5 µm. Ein Teil der Körner kann eine Größe bis zu wenigstens 25 µm haben. Die unregelmäßigen Erhöhungen können eine unterschiedliche Höhe haben. Der Hauptteil des in den Erhöhungen enthaltenen Materials ist vorzugsweise in solchen Erhöhungen enthalten, leren Höhe zwischen 0,5 und 5 µm liegt, bezogen auf das niedrigste Niveau an der Oberfläche des Films.The filler can include grains of silicon dioxide, aluminum oxide, kaolin, dolomite and lime. Because the grains consist of inorganic material, they have sufficient hardness to reduce the risk of damage from metal particles in the winding and also to reduce the risk that the predetermined distance between adjacent metal foil turns in the winding will not be maintained due to plastic deformation of the polymer becomes. The filler content is 0.5-5%, preferably 0.5-2.5%, of the total volume occupied by the polymer and the filler. At least one Part of the grains, preferably at least 25% of the total volume occupied by the grains, has a size of more than 1 µm and preferably a size of 2 to 15 µm, and preferably at least 5% of the total volume of the grains have a size of at least 5 µm. Some of the grains can be up to at least 25 µm in size. The irregular increases can have different heights. Most of the material contained in the ridges is preferably contained in such ridges, the height of which is between 0.5 and 5 µm, based on the lowest level on the surface of the film.

Anhand des in den Figuren gezeigten Ausführungsbeispieles soll die Erfindung näher erläutert werden. Es zeigen

  • Fig. 1 einen Querschnitt durch einen Transformatorschenkel, auf dem zwei Bandwicklungen sitzen,
  • Fig. 2 in verkleinertem Maßstab den Gegenstand nach Fig. 1 im Längsschnitt,
  • Fig. 3 in vergrößertem Maßstab einen Ausschnitt aus einem Schnitt durch eine der Wicklungen gemäß Fig. 1 und 2, der senkrecht zur Längsachse der Wicklung verläuft.
Based on the embodiment shown in the figures, the invention will be explained in more detail. Show it
  • 1 shows a cross section through a transformer leg, on which two ribbon windings sit,
  • 2 on a smaller scale the object of FIG. 1 in longitudinal section,
  • Fig. 3 in an enlarged scale a section of a section through one of the windings according to FIGS. 1 and 2, which is perpendicular to the longitudinal axis of the winding.

Die Figuren 1 und 2 zeigen einen Schenkel 10a sowie Teile des oberen und unteren Jochs 10b und 10c eines Eisenkerns für einen Starkstromtransformator. Der Schenkel 10a wird von einer als Niederspannumgswicklung ausgebildeten Innenwicklung 11 und einer als Hochspannungswicklung ausgebildeten Außenwicklung 12 umgeben. Beide Wicklungen sind Bandwicklungen, die mit Vorspannung gewickelt sind. Beide Wicklungen sind koaxial zueinander angeordnet, wobei sich zwischen ihnen ein zylinderringförmiger Raum bildet, in dem Rippen 13 aus Preßspan, Bakelit oder glasfaserarmiertem Polyester parallel zur Längsachse der Wicklungen angeordnet sind. Die Innenwicklung ist auf einen Formzylinder 14 gewickelt.Figures 1 and 2 show a leg 10a and parts of the upper and lower yokes 10b and 10c of an iron core for a power transformer. The leg 10a is surrounded by an inner winding 11 designed as a low-voltage winding and an outer winding 12 designed as a high-voltage winding. Both windings are tape windings that are wound with a bias. Both windings are arranged coaxially to one another, a cylindrical ring-shaped space being formed between them, in which ribs 13 made of pressboard, bakelite or glass fiber-reinforced polyester are arranged parallel to the longitudinal axis of the windings. The inner winding is wound on a forme cylinder 14.

Die Wicklungen 11 und 12 sind gemäß Figur 3 aus vielen Windungen eines Bandes aus einer Aluminiumfolie 15 und aus zwei Filmen 16 und 17 aus Polyäthylenglykolterephtalat aufgebaut, das 0.9 Volumenprozent Siliziumdioxyd in Form von im Film homogen verteilten Körnern enthält, von denen die größten Körner eine Größe von 10 µm haben. 80 % des Gesamtvolumens der Körner haben eine Größe von wenigstens 2 µm, und 20 % des Gesamtvolumens der Körner haben eine Größe von wenigstens 5 µm. Alternativ können die größten Körner eine Größe von ungefähr 25 µm haben. Die Polymerfilme haben Unebenheiten an der Oberfläche in Form von Erhöhungen 18, wobei die Höhe für den Hauptteil dieser Erhöhungen im Bereich zwischen 0,5 bis 5 µm liegt. Die Dicke der Aluminiumfolie beträgt 300 µm, und die Dicke jedes der Polymerfilme beträgt 25 µm.According to FIG. 3, the windings 11 and 12 are made up of many turns of a strip made of an aluminum foil 15 and of two films 16 and 17 made of polyethylene glycol terephthalate, which contains 0.9% by volume silicon dioxide in the form of grains homogeneously distributed in the film, the largest grains of which are one size of 10 µm. 80% of the total volume of the grains have a size of at least 2 µm and 20% of the total volume of the grains have a size of at least 5 µm. Alternatively, the largest grains can be approximately 25 µm in size. The polymer films have unevenness on the surface in the form of elevations 18, the height for the main part of these elevations being in the range between 0.5 and 5 μm. The thickness of the aluminum foil is 300 µm, and the thickness of each of the polymer films is 25 µm.

Die Räume 19 zwischen den einander zugewandten Flächen der Metallfolie und eines Polymerfilms bzw. zweier Polymerfilme stehen mit dem Raum 21 außerhalb der Stirnflächen 22 und 23 bzw. 24 und 25 der Wicklungen 11 und 12 in Verbindung.The spaces 19 between the mutually facing surfaces of the metal foil and a polymer film or two polymer films are connected to the space 21 outside the end faces 22 and 23 or 24 and 25 of the windings 11 and 12.

Bei der Herstellung des beschriebenen Transformators werden die Wicklungen bei erhöhter Temperatur vakuumgetrocknet und danach mit einer geeigneten Isolierflüssigkeit, wie z.B, Transformatorenöl, oder einem geeigneten Isoliergas, wie z.B. SF6, vakuumdruckimprägniert.In the manufacture of the transformer described, the windings are vacuum-dried at elevated temperature and then vacuum-impregnated with a suitable insulating liquid, such as, for example, transformer oil, or a suitable insulating gas, such as, for example, SF 6 .

Statt der zwei Polymerfilme können drei oder mehrere nebeneinander angeordnete Polymerfilme verwendet werden.Instead of the two polymer films, three or more polymer films arranged side by side can be used.

Claims (7)

1. Transformator oder Drosselspule mit mindestens einer Bandwicklung (11, 12), die aus mehreren radial über einander gewickelten Windungen eines eine Metallfolie (15) und mindestens zwei Polymerfilme (16, 17) enthaltenden Bandes aufgebaut ist, wobei die Metallfolie als Leiter dient und die Polymerfilme als Isolation zwischen den Windungsleitern dienen, dadurch gekennzeichnet, daß die Polymerfilme in ihnen eingebettete homogen verteilte Körner eines anorganischen Füllmittels enthalten und daß beide Oberflächen der Filme derart unregelmäßige Erhöhungen (18) aufweisen, daß zwischen einander zugewandten Flächen der Metallfolie und eines Polymerfilms und/oder zwischen einander zugewandten Flächen zweier Polymerfilme Räume (19) vorhanden sind, welche über die Stirnflächen (22, 23, 24, 25) der Bandwicklung mit dem Raum (21) außerhalb der Bandwicklung in Verbindung stehen.1. Transformer or choke coil with at least one tape winding (11, 12), which is constructed from a plurality of radially wound turns of a metal foil (15) and at least two polymer films (16, 17) containing tape, the metal foil serving as a conductor and the polymer films serve as insulation between the winding conductors, characterized in that the polymer films contain embedded homogeneously distributed grains of an inorganic filler in them and that both surfaces of the films have such irregular elevations (18) that between mutually facing surfaces of the metal foil and a polymer film and / or spaces (19) are present between mutually facing surfaces of two polymer films, which are connected via the end faces (22, 23, 24, 25) of the tape winding to the space (21) outside the tape winding. 2. Transformator oder Drosselspule nach Anspruch 1, dadurch gekennzeichnet, daß die Polymerfilme aus Polyäthylenglykolterephtalat bestehen.2. Transformer or choke coil according to claim 1, characterized in that the polymer films consist of polyethylene glycol terephthalate. 3. Transformator oder Drosselspule nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Füllmittel zumindest im wesentlichen aus Siliziumdioxyd besteht.3. Transformer or choke coil according to one of the preceding claims, characterized in that the filler consists at least essentially of silicon dioxide. 4. Transformator oder Drosselspule nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Füllmittel 0,5 bis 5 Prozent des gesamten von Polymer und Füllmittel eingenommenen Volumens einnimmt.4. Transformer or choke coil according to one of the preceding claims, characterized in that the filler occupies 0.5 to 5 percent of the total volume occupied by the polymer and filler. 5. Transformator oder Drosselspule nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß wenigstens 25 % des Gesamtvolumens der Körner eine Größe von über 1 µm haben.5. Transformer or choke coil according to one of the preceding claims, characterized in that at least 25% of the total volume of the grains have a size of over 1 micron. 6. Transformator oder Drosselspule nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß wenigstens 25 % des der Körner eine Größe von 2 - 15 m haben.6. Transformer or choke coil according to one of the preceding claims, characterized in that at least 2 5 % of the grains have a size of 2-15 m. 7. Transformator oder Drosselspule nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der überwiegende Teil des Materials, welches die Erhöhungen bildet, zu solchen Erhöhungen gehört, deren Höhe, bezogen auf das niedrigste Niveau der Oberfläche des Films, zwischen 0,5 - 5 µm. liegt.7. Transformer or choke coil according to one of claims 1 to 6, characterized in that the predominant part of the material which forms the elevations belongs to such elevations, the height, based on the lowest level of the surface of the film, between 0.5 - 5 µm. lies.
EP82710053A 1981-11-25 1982-11-15 Transformer or choke coil Expired EP0080430B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8107013 1981-11-25
SE8107013A SE428847B (en) 1981-11-25 1981-11-25 TRANSFORMER OR REACTOR

Publications (2)

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EP0080430A1 true EP0080430A1 (en) 1983-06-01
EP0080430B1 EP0080430B1 (en) 1986-03-26

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EP (1) EP0080430B1 (en)
JP (1) JPS5893207A (en)
CA (1) CA1210102A (en)
DE (1) DE3270161D1 (en)
NO (1) NO823942L (en)
SE (1) SE428847B (en)
ZA (1) ZA828623B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2943626A1 (en) * 1978-11-09 1980-05-22 Asea Ab POWER TRANSFORMER
DE2852422A1 (en) * 1978-12-04 1980-06-12 Eiserlo Friedrich Foil winding for high tension transformer - has doubled insulating layer wider and thicker than the metal foil
DE2947801A1 (en) * 1978-12-08 1980-06-19 Asea Ab Transformer or choke coil with strip winding - uses metal foil, firmly connected to each polymer film of strip, all turns of strip coil interconnected by respective polymer films

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2943626A1 (en) * 1978-11-09 1980-05-22 Asea Ab POWER TRANSFORMER
DE2852422A1 (en) * 1978-12-04 1980-06-12 Eiserlo Friedrich Foil winding for high tension transformer - has doubled insulating layer wider and thicker than the metal foil
DE2947801A1 (en) * 1978-12-08 1980-06-19 Asea Ab Transformer or choke coil with strip winding - uses metal foil, firmly connected to each polymer film of strip, all turns of strip coil interconnected by respective polymer films

Also Published As

Publication number Publication date
SE8107013L (en) 1983-05-26
EP0080430B1 (en) 1986-03-26
SE428847B (en) 1983-07-25
JPS5893207A (en) 1983-06-02
NO823942L (en) 1983-05-26
ZA828623B (en) 1983-09-28
CA1210102A (en) 1986-08-19
DE3270161D1 (en) 1986-04-30

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