EP0466642B1 - Shielding for an electric device - Google Patents

Shielding for an electric device Download PDF

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Publication number
EP0466642B1
EP0466642B1 EP91810499A EP91810499A EP0466642B1 EP 0466642 B1 EP0466642 B1 EP 0466642B1 EP 91810499 A EP91810499 A EP 91810499A EP 91810499 A EP91810499 A EP 91810499A EP 0466642 B1 EP0466642 B1 EP 0466642B1
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EP
European Patent Office
Prior art keywords
foil
metallized
base
cover
film
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EP91810499A
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German (de)
French (fr)
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EP0466642A1 (en
Inventor
Vincenz Dahinden
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H Weidmann AG
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H Weidmann AG
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material

Definitions

  • the present invention relates to a shield for an electrical device, in particular a transformer, according to the preamble of claim 1.
  • a toroidal transformer for low-frequency long-distance lines is known, which is provided with a static screen between the windings.
  • the screen consists of a metal band coated on both sides with plastic, which is wound helically overlapping over a winding.
  • a band-shaped shield for transformers which comprises several layers.
  • the middle layer consists of a ribbon-shaped copper foil, which is arranged between two ribbon foils made of resin or between two ribbon foils made of a soft paper-like material, all foils having approximately the same width.
  • the various foils are joined together at one end of the tape, for example with the help of heat and pressure.
  • shields or so-called shields made of Carbo Epoxi are often used to shield a transformer winding against the transformer core, against another transformer winding, the yoke or other construction parts.
  • Such transformer shields consist of two relatively thick plates made of an insulating material, for example cellulose, one of which has a strip-shaped, non-short-circuited metallized layer on one side, which is covered by the other plate and thus protected.
  • Other rigid insulation panels for power transformers are e.g. known from the patents FR-2 248 594 and FR-2 248 595.
  • Such shields prove to be disadvantageous in view of the fact that they are supplied to measure - for example in a round shape or as flat plates - and are therefore relatively complex and expensive. It is therefore an object of the present invention to provide a shield of the type mentioned above, which is less expensive.
  • An important advantage of the shielding according to the invention is that the plates no longer have to be spatially shaped by the manufacturer. This avoids damage to the metallized layer that would occur if the plates were to have their final, for example round or almost polygonal, shape only after the metallized layer had been produced.
  • the shield according to the invention is also self-supporting, mechanically stable, oil-resistant and provided with mechanically protected electrical shielding.
  • a first shield 1 is provided between a transformer core 2 and the inner winding 3 of the transformer and a second shield 4 between the inner winding 3 and the outer winding 5.
  • Such shields are also called transformer shields.
  • a transformer shield according to the prior art consists of two relatively thick plates made of an insulating material, for example cellulose, of which one plate 6 has a finger-shaped, but not short-circuited, metallized layer 7 on one side has, which is covered by the other plate 8 and thus protected.
  • Such shields are spatially shaped during assembly of the transformer, usually in a round, overlapping shape (Fig. 1).
  • a strip-like metallized film 11 for example made of a thin flexible but relatively resistant insulating material such as paper, is arranged between the two thicker films or plates 9 and 10.
  • the panels 9 and 10 are loosely sewn with a seam 12 at least at predetermined locations in order to keep the film 11 in between.
  • the thickness of the plate 9 and / or 10 is, for example, on the order of about 1 mm.
  • FIG. 4 shows part of the film 11, which consists of an arch acting as an insulating substrate and has metallized strips or zones 13, 14, 15, 16.
  • the metallization is only indicated by hatching in zone 13.
  • a so-called transverse contact 17 is attached across the longitudinal zones 13 to 16, which can be, for example, a transverse metallization, optionally with an additional knitted metallic stocking. Such a stocking can, for example, be sewn on and optionally soldered at points.
  • a connecting strand 18, for example made of copper, is soldered to the transverse metalization.
  • Such connecting strands which are also indicated in FIG. 1 with the reference numerals 18 and 18 ', serve to ground the metallized zone.
  • FIGS. 5 and 6 show, for example, a variant of the plates 9 and 10 for the special case of a non-circular shield for a yoke after they have been cut to shape in terms of area.
  • FIG. 7 shows, for example, a flat shield 70 with three connection options 71, 72, 73 for the metallized layer 74.
  • FIG. 8 shows, for example, a curved shield 80 with three connection options 81, 82, 83 for the metallized layer 84.
  • FIG. 9 shows, for example, a curved shield 90 with three connection options 91, 92, 93 for the metallized layer 94.
  • FIG. 10 shows, for example, a cylindrical shield 100 with a connection 101 for the metallized layer 102.
  • the positions k, h1 or h2 of the lead wire and the length L of the lead wire can be selected as desired.
  • the diameter d i 400 mm
  • the existing p 20 mm
  • the thickness s 2.5 mm
  • the distance c 50 mm.
  • the shields should preferably be pre-rounded and with d i > 700 mm supplied flat.
  • the plates also called base plates or cover plates, can be made of transformerboard, Nomex (R) or paper, for example.
  • the film 11 (FIG. 3 or 4) is also cut to shape in terms of area, but with smaller dimensions than the plates, so that between the edges 19 (FIG. 5) there is a predetermined stock of the film 11 and the edges 20 of the plates, which enables the plates to be sewn all around or at predetermined places 21, 22, 23 so that the film cannot slip out.
  • the film 11 can also be fixed on the base plate with glue dots before sewing the plates.
  • the shield can finally be rolled or shaped in order to make it cylindrical according to FIG. 1 or, for example, C-shaped according to FIG. 6.
  • Protective film intermediate layers for example made of paper, can be provided between the films 9 or 10 and the film 11, so that the film 11 is not damaged when the sign is bent.
  • the film can also be made of solid material without strips.
  • the laminated film 121 is folded over, for example, along an edge 122 of the width Um.
  • the film can also be folded over in the direction of the metal lamination strips 123.
  • the distance Um can be of the order of a few millimeters to centimeters.
  • the shielding according to the present invention it is not necessary to carry out the spatial shaping at the manufacturer. It can preferably be carried out directly when installed in the transformer. Another advantage is that the seam 12 between the plates or foils 9 and 10 results in a problem-free compensation of the mechanical stresses. The drying and impregnation of these shields is also easier and less dangerous because the formation of cracks in the so-called vapor phase is reduced. In addition, such shielding has very low manufacturing costs. When using a specially manufactured metal-lined paper there is an excellent temperature and oil resistance up to 120 ° C and practically no heating by induced circuits. Finally, to give an indication of the dimensioning of the metallic strips, it should be mentioned that these strips could have a width of 25 mm and a thickness of 20 ⁇ m, for example.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Cookers (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Cable Accessories (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Discharge Heating (AREA)

Abstract

The screening is provided for installation in a transformer between the inner winding (3) and the transformer core (2) and/or between two transformer windings (3, 5). Arranged between a base film and a covering film (9 and 10 respectively) of an insulating material is a flexible film (11), which is metallised in a strip-shaped manner and has transverse metallisation (18) which is designed in the form of a worked, metallised stocking which is soldered onto the metallised strips (13, 14, 15, 16) of the film (11). The base film and the covering film (9 and 10 respectively) are thicker than the film (11) metallised in a strip-shaped manner and the areas of the base film and of the covering film (9 and 10, respectively) are larger than the area of the film (11) in a strip-shaped manner, the base film and the covering film being sewn all round. <IMAGE>

Description

Die vorliegende Erfindung betrifft eine beschirmung für eine elektrische Vorrichtung, insbesondere einen Transformator, gemäss dem Oberbegriff des Patentanspruchs 1.The present invention relates to a shield for an electrical device, in particular a transformer, according to the preamble of claim 1.

Aus der DE-OS 24 51 297 ist ein Ringkern-Uebertrager für Niederfrequenz-Fernleitungen bekannt, der mit einem statischen Schirm zwischen den Wicklungen versehen ist. Der Schirm besteht aus einem beidseitig mit Kunststoff beschichteten Metallband, das wendelförmig überlappend über eine Wicklung gewickelt ist. Durch eine solche Lösung kann zwar die für das Aufbringen des Schirmes benötigte Zeit herabgesetzt werden; bei Leistungstransformatoren erweist sich jedoch diese Lösung als nachteilig im Hinblick darauf, dass das Metallband wendelförmig über eine Wicklung gewickelt werden muss, was immer noch einen ziemlich zeitraubenden Arbeitsvorgang darstellt.From DE-OS 24 51 297 a toroidal transformer for low-frequency long-distance lines is known, which is provided with a static screen between the windings. The screen consists of a metal band coated on both sides with plastic, which is wound helically overlapping over a winding. With such a solution, the time required for the application of the screen can be reduced; in power transformers, however, this solution proves to be disadvantageous in that the metal strip must be wound helically over a winding, which is still a fairly time-consuming operation.

Aus dem japanischen Patentdokument JP-A-60-189912 ist eine bandförmige Abschirmung für Transformatoren bekannt, die mehrere Schichten umfasst. Die mittlere Schicht besteht aus einer bandförmigen Kupferfolie, die zwischen zwei Bandfolien aus Harz oder zwischen zwei Bandfolien aus einem weichen papierähnlichen Material angeordnet ist, wobei alle Folien ungefähr gleich breit sind. Die verschiedenen Folien sind beispielsweise mit Hilfe von Wärme und Druck an einem Bandende zusammenverbunden.From Japanese patent document JP-A-60-189912 a band-shaped shield for transformers is known, which comprises several layers. The middle layer consists of a ribbon-shaped copper foil, which is arranged between two ribbon foils made of resin or between two ribbon foils made of a soft paper-like material, all foils having approximately the same width. The various foils are joined together at one end of the tape, for example with the help of heat and pressure.

Im Gegensatz dazu werden oft zum beschirmen einer Transformatorwicklung gegen den Transformatorkern, gegen eine andere Tranformatorwicklung, das Joch oder andere Konstruktionsteile Abschirmungen oder sogenannte Schilde beispielsweise aus Carbo Epoxi eingesetzt. Solche Transformatorschilde bestehen aus zwei relativ dicken Platten aus einem Isoliermaterial, beispielsweise Cellulose, von denen die eine auf der einen Seite eine streifenförmig ausgestaltete, nicht kurzgeschlossene metallisierte Schicht aufweist, die von der anderen Platte bedeckt und somit geschützt ist. Weitere starre Isolierplatten für Leistungstransformatoren sind z.B. aus den Patentschriften FR-2 248 594 und FR-2 248 595 bekannt.In contrast to this, shields or so-called shields made of Carbo Epoxi, for example, are often used to shield a transformer winding against the transformer core, against another transformer winding, the yoke or other construction parts. Such transformer shields consist of two relatively thick plates made of an insulating material, for example cellulose, one of which has a strip-shaped, non-short-circuited metallized layer on one side, which is covered by the other plate and thus protected. Other rigid insulation panels for power transformers are e.g. known from the patents FR-2 248 594 and FR-2 248 595.

Solche Abschirmungen erweisen sich als nachteilig im Hinblick darauf, dass sie nach Mass - beispielsweise in runder Form oder als flache Platten - geliefert werden und daher relativ aufwendig und teuer sind. Es ist daher Aufgabe der vorliegenden Erfindung eine beschirmung der eingangs erwähnten Art zu schaffen, die weniger aufwendig ist.Such shields prove to be disadvantageous in view of the fact that they are supplied to measure - for example in a round shape or as flat plates - and are therefore relatively complex and expensive. It is therefore an object of the present invention to provide a shield of the type mentioned above, which is less expensive.

Diese Aufgabe wird erfindungsgemäss durch eine beschirmung mit den im kennzeichnenden Teil des Patentanspruchs 1 angegebenen Merkmalen gelöst. Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen angegeben.This object is achieved according to the invention by shielding with the features specified in the characterizing part of patent claim 1. Further advantageous embodiments of the invention are specified in the dependent claims.

Ein wichtiger Vorteil der erfindungsgemässen beschirmung besteht darin, dass die Platten nicht mehr beim Hersteller räumlich geformt werden müssen. Damit wird eine Beschädigung der metallisierten Schicht vermieden, die auftreten würde, wenn die Platten ihre endgültige, beispielsweise runde oder auch fast polygonale Form erst nach der Herstellung der metallisierten Schicht erhalten sollten.An important advantage of the shielding according to the invention is that the plates no longer have to be spatially shaped by the manufacturer. This avoids damage to the metallized layer that would occur if the plates were to have their final, for example round or almost polygonal, shape only after the metallized layer had been produced.

Der erfindungsgemässe Schild ist zudem selbsttragend, mechanisch stabil, ölbeständig und mit einer mechanisch geschützten elektrischen Schirmung versehen.The shield according to the invention is also self-supporting, mechanically stable, oil-resistant and provided with mechanically protected electrical shielding.

Im folgenden wird die Erfindung beispielsweise anhand einer Zeichnung näher erläutert. Es zeigen:

  • Fig. 1 eine schematische Darstellung eines Transformators mit einer ersten beschirmung zwischen dem Transformatorkern und der inneren Wicklung und mit einer zweiten Abschirmung zwischen den zwei Wicklungen,
  • Fig. 2 eine Querschnittdarstellung eines Transformatorschildes nach dem Stand der Technik vor der räumlichen Formgebung,
  • Fig. 3 eine Querschnittdarstellung einer Abschirmung nach der Erfindung,
  • Fig. 4 eine schematische Draufsicht einer Folie für eine Abschirmung nach der Erfindung,
  • Fig. 5 und 6 eine Draufsicht bzw. Seitenansicht des Aufbaus einer erfindungsgemässen Abschirmung für ein Joch,
  • Fig. 7 bis 10 verschiedene Beispiele von Grundformen einer Abschirmung nach der vorliegenden Erfindung,
  • Fig. 11 eine Variante des überlappenden Bereichs der Grundform nach Fig. 10, und
  • Fig. 12 eine schematische Darstellung des Randes der kaschierten Folie.
The invention is explained in more detail below, for example, using a drawing. Show it:
  • 1 is a schematic representation of a transformer with a first shield between the transformer core and the inner winding and with a second shield between the two windings,
  • 2 shows a cross-sectional representation of a transformer shield according to the prior art before the spatial shaping,
  • 3 shows a cross-sectional illustration of a shield according to the invention,
  • 4 shows a schematic top view of a film for a shield according to the invention,
  • 5 and 6 are a plan view and a side view of the structure of a shield according to the invention for a yoke,
  • 7 to 10 different examples of basic forms of a shield according to the present invention,
  • 11 shows a variant of the overlapping area of the basic shape according to FIG. 10, and
  • Fig. 12 is a schematic representation of the edge of the laminated film.

In der Darstellung nach Fig. 1 ist eine erste Abschirmung 1 zwischen einem Transformatorkern 2 und der inneren Wicklung 3 des Transformators und eine zweite Abschirmung 4 zwischen der inneren Wicklung 3 und der äusseren Wicklung 5 vorgesehen. Solche Abschirmungen werden auch Transformatorschilde genannt.In the illustration according to FIG. 1, a first shield 1 is provided between a transformer core 2 and the inner winding 3 of the transformer and a second shield 4 between the inner winding 3 and the outer winding 5. Such shields are also called transformer shields.

Ein Transformatorschild nach dem Stand der Technik, wie er in Fig. 2 dargestellt ist, besteht aus zwei relativ dicken Platten aus einem Isoliermaterial, beispielsweise Cellulose, von denen die eine Platte 6 auf der einen Seite eine fingerförmig ausgestaltete, jedoch nicht kurzgeschlossene metallisierte Schicht 7 aufweist, die von der anderen Platte 8 bedeckt und somit geschützt ist. Solche Abschirmungen werden bei der Montage des Transformators räumlich geformt, und zwar meistens in runder, überlappender form (Fig. 1).A transformer shield according to the prior art, as shown in FIG. 2, consists of two relatively thick plates made of an insulating material, for example cellulose, of which one plate 6 has a finger-shaped, but not short-circuited, metallized layer 7 on one side has, which is covered by the other plate 8 and thus protected. Such shields are spatially shaped during assembly of the transformer, usually in a round, overlapping shape (Fig. 1).

Die beschirmung nach der Erfindung weist gemäss Fig. 3 ebenfalls zwei dickere Folien oder Platten 9 und 10 aus einem Isoliermaterial auf, die jedoch nicht metallisiert sind. Nach der Erfindung ist hingegen eine streifenförmig metallisierte Folie 11, beispielsweise aus einem dünnen flexiblen, jedoch relativ beständigen Isoliermaterial, wie Papier, zwischen den zwei dickeren Folien oder Platten 9 und 10 angeordnet. Dabei sind die Platten 9 und 10 mit einer Naht 12 mindenstens auf vorbestimmten Stellen lose genäht, um die Folie 11 dazwischen zu halten. Die Dicke der Platte 9 und/oder 10 liegt beispielsweise in der Grössenordnung von etwa 1 mm.3 also has two thicker foils or plates 9 and 10 made of an insulating material, which, however, are not metallized. According to the invention, on the other hand, a strip-like metallized film 11, for example made of a thin flexible but relatively resistant insulating material such as paper, is arranged between the two thicker films or plates 9 and 10. The panels 9 and 10 are loosely sewn with a seam 12 at least at predetermined locations in order to keep the film 11 in between. The thickness of the plate 9 and / or 10 is, for example, on the order of about 1 mm.

In Fig. 4 ist ein Teil der Folie 11 dargestellt, die aus einem als Isoliersubstrat wirkenden Bogen besteht und metallisierte Streifen oder Zonen 13, 14, 15, 16 aufweist. Zur Vereinfachung der Figur ist die Metallisierung nur bei der Zone 13 durch eine Schraffierung angedeutet. Quer durch die Längszonen 13 bis 16 ist eine sogenannte Querkontaktierung 17 angebracht, die beispielsweise eine Quermetallisierung gegebenenfalls mit einem zusätzlichen gewirkten metallischen Strumpf sein kann. Ein solcher Strumpf kann beispielsweise aufgenäht und gegebenenfalls punktweise gelötet werden. An die Quermetallisierung wird eine Anschlusslitze 18, beispielsweise aus Kupfer, gelötet. Solche Anschlusslitzen, die auch in Fig. 1 mit den Bezugszeichen 18 und 18' angegeben sind, dienen zur Erdung der metallisierten Zone.FIG. 4 shows part of the film 11, which consists of an arch acting as an insulating substrate and has metallized strips or zones 13, 14, 15, 16. To simplify the figure, the metallization is only indicated by hatching in zone 13. A so-called transverse contact 17 is attached across the longitudinal zones 13 to 16, which can be, for example, a transverse metallization, optionally with an additional knitted metallic stocking. Such a stocking can, for example, be sewn on and optionally soldered at points. A connecting strand 18, for example made of copper, is soldered to the transverse metalization. Such connecting strands, which are also indicated in FIG. 1 with the reference numerals 18 and 18 ', serve to ground the metallized zone.

In den Figuren 5 und 6 ist beispielsweise eine Variante der Platten 9 und 10 für den Spezialfall einer nichtkreisrunden Abschirmung für ein Joch angegeben, nachdem sie flächenmässig auf Form zugeschnitten wurden.FIGS. 5 and 6 show, for example, a variant of the plates 9 and 10 for the special case of a non-circular shield for a yoke after they have been cut to shape in terms of area.

In Fig. 7 ist beispielsweise eine flache Abschirmung 70 mit drei Anschlussmöglichkeiten 71, 72, 73 für die metallisierte Schicht 74 dargestellt.7 shows, for example, a flat shield 70 with three connection options 71, 72, 73 for the metallized layer 74.

In Fig. 8 ist beispielsweise eine gewölbte Abschirmung 80 mit drei Anschlussmöglichkeiten 81, 82, 83 für die metallisierte Schicht 84 dargestellt.FIG. 8 shows, for example, a curved shield 80 with three connection options 81, 82, 83 for the metallized layer 84.

In Fig. 9 ist beispielsweise eine gebogene beschirmung 90 mit drei Anschlussmöglichkeiten 91, 92, 93 für die metallisierte Schicht 94 dargestellt.9 shows, for example, a curved shield 90 with three connection options 91, 92, 93 for the metallized layer 94.

In Fig. 10 ist beispielsweise eine zylindrische Abschirmung 100 mit einer Anschlussmöglichkeit 101 für die metallisierte Schicht 102 dargestellt.10 shows, for example, a cylindrical shield 100 with a connection 101 for the metallized layer 102.

In den Figuren 7 bis 10 können vorzugsweise die Lagen k, h₁ oder h₂ der Ausleitungslitze und die Länge L der Ausleitungslitze nach Wunsch gewählt werden. In den Figuren 7 bis 11 können beispielsweise der Nährand e = 15 mm, der Durchmesser di = 400 mm, der bestand p = 20 mm, die Dicke s = 2,5 mm und der Abstand c = 50 mm sein. Bei di < 700 mm sollten die Schilde vorzugsweise vorgerundet und bei di > 700 mm flachliegend geliefert werden.In Figures 7 to 10, the positions k, h₁ or h₂ of the lead wire and the length L of the lead wire can be selected as desired. In FIGS. 7 to 11, for example, the sewing edge can be e = 15 mm, the diameter d i = 400 mm, the existing p = 20 mm, the thickness s = 2.5 mm and the distance c = 50 mm. With d i <700 mm, the shields should preferably be pre-rounded and with d i > 700 mm supplied flat.

Die Platten, auch Basisplatte bzw. Deckplatte genannt, können beispielsweise aus transformerboard, Nomex(R) oder Papier sein. Die Folie 11 (Fig. 3 oder 4) wird ebenfalls flächenmässig auf Form zugeschnitten, jedoch mit kleineren Abmessungen als die Platten, so dass zwischen den Rändern 19 (Fig.5) der Folie 11 und den Rändern 20 der Platten ein vorbestimmter bestand vorhanden ist, der ein Nähen der Platten rundherum oder auf vorbestimmten Stellen 21, 22, 23 ermöglicht, damit die Folie nicht herausrutschen kann. Zu diesem Zweck kann jedoch auch die Folie 11 vor dem Nähen der Platten mit Leimtupfen auf der Basisplatte fixiert werden. Nach solchen Operationen kann schliesslich die Abschirmung gerollt oder geformt werden, um sie zylinderförmig gemäss Fig. 1 oder z.B. C-förmig nach Fig. 6 zu gestalten.The plates, also called base plates or cover plates, can be made of transformerboard, Nomex (R) or paper, for example. The film 11 (FIG. 3 or 4) is also cut to shape in terms of area, but with smaller dimensions than the plates, so that between the edges 19 (FIG. 5) there is a predetermined stock of the film 11 and the edges 20 of the plates, which enables the plates to be sewn all around or at predetermined places 21, 22, 23 so that the film cannot slip out. For this purpose, however, the film 11 can also be fixed on the base plate with glue dots before sewing the plates. After such operations, the shield can finally be rolled or shaped in order to make it cylindrical according to FIG. 1 or, for example, C-shaped according to FIG. 6.

Zwischen den Folien 9 bzw. 10 und der Folie 11 können Schutzfolienzwischenschichten, beispielsweise aus Papier, vorgesehen sein, so dass die Folie 11 beim Biegen des Schildes nicht beschädigt wird. Dabei kann die Folie auch aus Vollmaterial ohne Streifen gefertigt sein.Protective film intermediate layers, for example made of paper, can be provided between the films 9 or 10 and the film 11, so that the film 11 is not damaged when the sign is bent. The film can also be made of solid material without strips.

Ein Verfahren zur Herstellung einer solchen Abschirmung kann daher mindestens einige unter den folgenden Verfahrensschritten aufweisen:

  • 1.) Zuschneiden eines Bogens einer metall-kaschierten Folie, beispielsweise eines metall-kaschierten Papiers 11.
  • 2.) Anbringen der Querkontaktierung beziehungsweise Quermetallisierung 17.
  • 3.) Löten eines Anschlusskabels, beispielsweise einer Anschlusslitze 18, an die Querkontaktierung oder Quermetallisierung 17.
  • 4.) Zuschneiden der Basis-Platte oder Folie 9 auf Form.
  • 5.) Fixieren der Folie 11 auf der Basis-Platte oder Folie 9 mit Leimtupfen.
  • 6.) Fakultatives Einlegen einer Schutzfolienzwischenschicht beispielsweise aus Papier.
  • 7.) Zuschneiden der Deck-Platte oder Folie 10 auf Form.
  • 8.) Verbinden der zwei Platten oder Folien 9 und 10, mindenstens auf vorbestimmten Stellen durch Nähen.
A method for producing such a shield can therefore have at least some of the following method steps:
  • 1.) Cutting a sheet of a metal-clad film, for example a metal-clad paper 11.
  • 2.) Attaching the transverse contact or transverse metalization 17.
  • 3.) Soldering a connecting cable, for example a connecting wire 18, to the cross-contact or cross-metalization 17.
  • 4.) Cut the base plate or film 9 to shape.
  • 5.) Fix the film 11 on the base plate or film 9 with glue dots.
  • 6.) Optional insertion of a protective film intermediate layer made of paper, for example.
  • 7.) Cut the cover plate or film 10 to shape.
  • 8.) Connect the two plates or foils 9 and 10, at least at predetermined locations by sewing.

In Fig. 12 ist ein Rand der kaschierten Folie im einzelnen dargestellt. Um das durch die Kante überhöhte elektrostatische Feld günstiger zu gestalten, ist die kaschierte Folie 121 beispielsweise entlang einem Rand 122 der Breite Um umgeschlagen. Die Folie kann auch in Richtung der Metallkaschierungsstreifen 123 umgeschlagen sein. Der Abstand Um kann in der Grössenordnung von einigen Millimetern bis Zentimetern liegen.An edge of the laminated film is shown in detail in FIG. 12. In order to make the electrostatic field exaggerated by the edge more favorable, the laminated film 121 is folded over, for example, along an edge 122 of the width Um. The film can also be folded over in the direction of the metal lamination strips 123. The distance Um can be of the order of a few millimeters to centimeters.

Bei der Abschirmung nach der vorliegenden Erfindung ist es nicht notwendig, die räumliche Formgebung beim Hersteller vorzunehmen. Sie kann vorzugsweise direkt beim Einbau in den Transformator durchgeführt werden. Ein weiterer Vorteil ist, dass sich durch die Naht 12 zwischen den Platten oder Folien 9 und 10 ein problemloser Ausgleich der mechanischen Spannungen ergibt. Die Trocknung und Imprägnierung dieser Schilde ist ebenfalls leichter und gefahrloser durchzuführen, da die Rissbildung in der sogenannten Vapour-Phase vermindert wird. Ausserdem weist eine solche beschirmung sehr niedrige Herstellungskosten auf. Bei Verwendung eines speziell hergestellten metallkaschierten Papiers ergibt sich eine hervorragende Temperatur- und Oelbeständigkeit bis 120° C und praktisch keine Erwärmung durch induzierte Stromkreise. Um einen Anhaltspunkt bei der Dimensionierung der metallischen Streifen zu geben, sei schliesslich noch erwähnt, dass diese Streifen beispielsweise eine Breite von 25 mm und eine Dicke von 20 µm aufweisen könnten.With the shielding according to the present invention, it is not necessary to carry out the spatial shaping at the manufacturer. It can preferably be carried out directly when installed in the transformer. Another advantage is that the seam 12 between the plates or foils 9 and 10 results in a problem-free compensation of the mechanical stresses. The drying and impregnation of these shields is also easier and less dangerous because the formation of cracks in the so-called vapor phase is reduced. In addition, such shielding has very low manufacturing costs. When using a specially manufactured metal-lined paper there is an excellent temperature and oil resistance up to 120 ° C and practically no heating by induced circuits. Finally, to give an indication of the dimensioning of the metallic strips, it should be mentioned that these strips could have a width of 25 mm and a thickness of 20 µm, for example.

Claims (10)

  1. Shielding for an electrical power supply device, particularly a power transformer, for installation between an inner winding (3) and a core (2) of soft magnetic material or between two windings (3, 5) or for shielding a yoke, a metallized, flexible foil (11) being arranged between a base foil and a cover foil (9 and 10, respectively) of an insulating material, these base and cover foils being constructed as large-area flexible foils or plates and the areas of the base foil and of the cover foil (9 and 10, respectively) being larger than the area of the metallized foil (11) in order to form an edge area without metallized foil, characterized in that the base foil and the cover foil (9, 10) are thicker than the metallized foil (11), and in that in the said edge area, the base foil (9) and the cover foil (10) are loosely sewn, at least at predetermined points, with a seam (12) in order to hold the metallized foil (11) therebetween, in such a manner that the seam (12) results in an equalization of the mechanical stresses.
  2. Shielding according to Claim 1, characterized in that the metallized foil (11) exhibits metallized strips (13, 14, 15, 16) which are joined by a cross-contact arrangement (17).
  3. Shielding according to Claim 2, characterized in that the cross-contact arrangement (17) is formed by a metal fabric sock.
  4. Shielding according to Claim 2 or 3, characterized in that the cross-contact arrangement (17) or the sock is connected to a stranded wire (18).
  5. Shielding according to one of Claims 1 to 4, characterized in that the base foil and/or the cover foil (9 and 10, respectively) are flat, bent or domed plates of transformer board.
  6. Shielding according to one of Claims 1 to 5, characterized in that the metallized foil (11) is fixed in location on the base foil (9) by means of glue spots.
  7. Shielding according to one of Claims 1 to 6, characterized in that the base foil (9) and the cover foil (10) are joined at least at two points at the edges.
  8. Shielding according to one of Claims 1 to 7, characterized in that an intermediate protective foil layer is present between the metallized foil (11) and at least one of the other foils (9; 10).
  9. Method for producing a shielding according to one of Claims 2 to 8, characterized by the following method steps:
    - cutting a metal-clad foil (11) to shape,
    - applying the cross-contact arrangement (17),
    - soldering a connecting cable (18) to the cross-contact arrangement,
    - cutting the base foil (9) to shape,
    - cutting the cover foil (10) to shape,
    - joining the base and cover foils (9, 10) by a seam (12) at least at predetermined points.
  10. Method according to Claim 9, characterized by the following further method steps:
    - fixing the metallized foil (11) in location on the base foil by means of glue spots,
    - optionally inserting an intermediate protective foil layer.
EP91810499A 1990-07-10 1991-06-26 Shielding for an electric device Expired - Lifetime EP0466642B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH229090 1990-07-10
CH2290/90 1990-07-10

Publications (2)

Publication Number Publication Date
EP0466642A1 EP0466642A1 (en) 1992-01-15
EP0466642B1 true EP0466642B1 (en) 1994-04-20

Family

ID=4230319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91810499A Expired - Lifetime EP0466642B1 (en) 1990-07-10 1991-06-26 Shielding for an electric device

Country Status (5)

Country Link
EP (1) EP0466642B1 (en)
AT (1) ATE104800T1 (en)
DE (1) DE59101427D1 (en)
DK (1) DK0466642T3 (en)
ES (1) ES2055980T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4009338A1 (en) * 2020-12-02 2022-06-08 BSH Hausgeräte GmbH Transformer for a switching power supply

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995006950A1 (en) * 1993-09-02 1995-03-09 Melcher Ag Transformer
TW369654B (en) 1997-07-07 1999-09-11 Thomson Brandt Gmbh Diode-split high-voltage transformer
DE102010056325B3 (en) * 2010-12-27 2012-02-16 Maschinenfabrik Reinhausen Gmbh Method for producing a shield
EP2645384B1 (en) * 2012-03-27 2018-11-14 Siemens Aktiengesellschaft Transformer and method for manufacturing a transformer
CN113862633B (en) * 2021-09-30 2023-09-26 安徽铜峰电子股份有限公司 Special specification oil screen apron of ultra-thin type metallized film

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1258939B (en) * 1963-01-07 1968-01-18 Licentia Gmbh Insulating sheet for the production of spatially deformable insulation
US3678428A (en) * 1971-05-17 1972-07-18 Westinghouse Electric Corp Interwinding shield for power transformers
FR2248595B3 (en) * 1973-10-23 1977-07-22 Westinghouse Electric Corp
US3842186A (en) * 1973-10-23 1974-10-15 Westinghouse Electric Corp Static plate for power transformers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4009338A1 (en) * 2020-12-02 2022-06-08 BSH Hausgeräte GmbH Transformer for a switching power supply

Also Published As

Publication number Publication date
DE59101427D1 (en) 1994-05-26
ATE104800T1 (en) 1994-05-15
DK0466642T3 (en) 1994-05-16
ES2055980T3 (en) 1994-09-01
EP0466642A1 (en) 1992-01-15

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