EP0466642B1 - Abschirmung für eine elektrische Vorrichtung - Google Patents

Abschirmung für eine elektrische Vorrichtung 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
Authority
EP
European Patent Office
Prior art keywords
foil
metallized
base
cover
film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91810499A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0466642A1 (de
Inventor
Vincenz Dahinden
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
H Weidmann AG
Original Assignee
H Weidmann AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by H Weidmann AG filed Critical H Weidmann AG
Publication of EP0466642A1 publication Critical patent/EP0466642A1/de
Application granted granted Critical
Publication of EP0466642B1 publication Critical patent/EP0466642B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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.

Landscapes

  • 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)
  • Cable Accessories (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Discharge Heating (AREA)
  • Cookers (AREA)
  • Percussion Or Vibration Massage (AREA)
EP91810499A 1990-07-10 1991-06-26 Abschirmung für eine elektrische Vorrichtung Expired - Lifetime EP0466642B1 (de)

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 (de) 1992-01-15
EP0466642B1 true EP0466642B1 (de) 1994-04-20

Family

ID=4230319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91810499A Expired - Lifetime EP0466642B1 (de) 1990-07-10 1991-06-26 Abschirmung für eine elektrische Vorrichtung

Country Status (5)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4009338A1 (de) * 2020-12-02 2022-06-08 BSH Hausgeräte GmbH Transformator für ein schaltnetzteil

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59307652D1 (de) * 1993-09-02 1997-12-11 Melcher Ag Transformator
TW369654B (en) 1997-07-07 1999-09-11 Thomson Brandt Gmbh Diode-split high-voltage transformer
DE102010056325B3 (de) 2010-12-27 2012-02-16 Maschinenfabrik Reinhausen Gmbh Verfahren zur Herstellung einer Abschirmung
EP2645384B1 (de) * 2012-03-27 2018-11-14 Siemens Aktiengesellschaft Transformator und Verfahren zur Herstellung eines Transformators
CN113862633B (zh) * 2021-09-30 2023-09-26 安徽铜峰电子股份有限公司 一种超薄型金属化薄膜专用规格油屏盖板

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1258939B (de) * 1963-01-07 1968-01-18 Licentia Gmbh Isolierbahn zur Herstellung raeumlich verformbarer Isolierungen
US3678428A (en) * 1971-05-17 1972-07-18 Westinghouse Electric Corp Interwinding shield for power transformers
US3842186A (en) * 1973-10-23 1974-10-15 Westinghouse Electric Corp Static plate for power transformers
FR2248595B3 (es) * 1973-10-23 1977-07-22 Westinghouse Electric Corp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4009338A1 (de) * 2020-12-02 2022-06-08 BSH Hausgeräte GmbH Transformator für ein schaltnetzteil

Also Published As

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

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