EP0049444B1 - Bobine électrique à bandes pour appareils électriques - Google Patents

Bobine électrique à bandes pour appareils électriques Download PDF

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Publication number
EP0049444B1
EP0049444B1 EP81107670A EP81107670A EP0049444B1 EP 0049444 B1 EP0049444 B1 EP 0049444B1 EP 81107670 A EP81107670 A EP 81107670A EP 81107670 A EP81107670 A EP 81107670A EP 0049444 B1 EP0049444 B1 EP 0049444B1
Authority
EP
European Patent Office
Prior art keywords
sheet
depressions
wound coil
wound
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81107670A
Other languages
German (de)
English (en)
Other versions
EP0049444A1 (fr
Inventor
Lennart Ing. Längberg
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
Publication of EP0049444A1 publication Critical patent/EP0049444A1/fr
Application granted granted Critical
Publication of EP0049444B1 publication Critical patent/EP0049444B1/fr
Expired 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/321—Insulating of coils, windings, or parts thereof using a fluid for insulating purposes only
    • 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
    • H01F27/2847—Sheets; Strips
    • H01F2027/2857—Coil formed from wound foil conductor

Definitions

  • the invention relates to an electrical tape winding for electrical devices according to the preamble of claim 1.
  • a tape winding for, for example, a transformer or a choke can consist of several turns of a tape, which consists of a metal foil serving as a conductor and an insulation layer consisting of a polymer film and possibly 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 mica is avoided. Since the tape winding can have a width of a few meters and can be pre-tensioned, drying and impregnation are complicated and time-consuming operations. The use of paper in the winding insulation is not desirable per se because it contributes to a great extent to that It takes a long time to dry the tape winding and the transformer becomes larger without increasing the power of the transformer.
  • the invention has for its object to develop a tape winding of the type mentioned, which can be completely impregnated in a simple manner without the above-mentioned paper layers are required for this.
  • the depressions extend to the space adjacent to the end faces (end faces) of the tape winding and are in connection therewith, a complete impregnation of the tape winding with insulating liquid or insulating gas is achieved.
  • the invention is also advantageous in the case of a tape winding which is built up with the paper layers mentioned. In these cases, the invention achieves that the time required for drying the tape winding is considerably shortened, since the diffusion distances for moisture are considerably shorter than in the known tape windings.
  • the metal foil such as a foil of aluminum or copper, usually has a thickness of 5-3000 m Jl and preferably a thickness of 50-3000 / lm.
  • the polymer film which is preferably a separate film, that is to say is not attached to the metal foil and forms a coating anchored to the metal foil, should be able to withstand a temperature of at least 90 ° C. in the long term.
  • Polyethylene glycol terephthalate, polycarbonate, polyimed, cellulose acetate and polyamide can be mentioned as examples of suitable polymers in the film.
  • a suitable thickness of the film is between 5 and 200 J lm, preferably between 10 and 100 microns.
  • the polymer film preferably has a greater width than the metal foil, so that the polymer film protrudes beyond the edges of the metal foil and thus prevents electrical flashovers between the foil turns or along the end face of the winding. If paper is used in the tape winding, it should be as thin as possible. Its thickness is said to be in the range of 5-25 pm.
  • the depressions in the metal foil and their execution are the decisive factors for the invention. It is important that these are depressions and not elevations. Each depression is thus surrounded by smooth parts which have a considerably greater extent than the depressions. This ensures that the polymer film rests on at least approximately flat surfaces around the depressions, and prevents the polymer film from being plastically deformed, which would both clog the connecting channels to the space outside the end surfaces of the winding and reduce the insulation spacing would.
  • the recesses can a. deal with impressions or recessed grooves.
  • the depressions on one side of the metal foil are designed so that they do not cause any elevations on the other side of the metal foil.
  • the depressions which are preferably provided on both sides of the film, can preferably be arranged such that they run parallel to one another and straight on each side of the film.
  • it is advantageous to make mutually intersecting recesses on both sides of the metal foil e.g. such that a first group of depressions runs parallel to one another in a first direction and a second group of depressions runs parallel to one another in a second direction, the depressions of the two groups crossing each other and forming lattice patterns. If the passage should be blocked in a depression, so that an area of the winding insulation would be cut off from the connection to the space outside the tape winding via the affected depression, the above-mentioned insulation area is supplied with impregnation agent via adjacent connections.
  • the depressions In order to completely or at least sufficiently prevent the polymer film from sinking into the depressions, the depressions must not be too wide and not too shallow. Also, the cross-sectional area of the metal foil must not be weakened too much due to the current density in the foil.
  • the depressions expediently have a depth of 2-25 ⁇ m and a maximum width of 2-50 ⁇ m, preferably a depth of 5-15 ⁇ m and a maximum width of 10-30 ⁇ m. If the depressions run parallel to one another, the distance between the centers of adjacent parallel depressions must suitably be 1-30 mm, preferably 5-20 mm. However, the depth should not exceed 25% of the thickness of the metal foil.
  • the cross section of the depressions can have various shapes, such as the shape of a semicircle with the diameter in the plane of the film surface, a rectangle or a triangle with the hypotenuse in the plane of the film surface.
  • FIG. 1 shows an aluminum foil 10 with parallel recesses 11, the direction of which forms an oblique angle with the edges 12 and 13 of the film.
  • FIG. 2 shows another aluminum foil 14 with a first group of depressions 15 which run parallel to one another in a first direction and with a second group of depressions 16 which run parallel to one another in a second direction. Both directions form an oblique angle with the edges 17 and 18 of the film.
  • the foils 10 and 14 are provided with the same depressions on their underside facing away from the observer as on their top side.
  • the cross section of the depressions 15 and 16 is semicircular, as can be seen from FIGS. 5 and 6, in which part of the cross section of the film 14 is shown.
  • the foils 10 and 14 have a thickness of 300 11 m.
  • the depressions 11, 15 and 16 have a depth of 10 11 m, a width of 20 ⁇ m and the mutually parallel depressions are arranged at a distance of 10 mm from one another.
  • the depressions on the foils can be produced, for example, by a rolling process in which the surfaces of the rollers have elevations which correspond to the depressions to be produced in the metal foil.
  • Figures 3 and 4 show part of a power transformer. One can see a leg 19 a and parts of the yokes 19 b and 19 c of the transformer core.
  • the inner winding 21, which is designed as a low-voltage winding sits on the leg 19 a
  • the outer winding 22 which is designed as a high-voltage winding, sits around this leg.
  • Both windings are band windings wound with pretension. They are arranged coaxially to one another, and between them is a hollow cylindrical space in which ribs 23 made of pressboard, bakelite or glass fiber-reinforced polyester are attached parallel to the axis of the windings.
  • the inner winding is wound on a forme cylinder 24.
  • the windings 21 and 22 consist, in accordance with FIG. 5, of a plurality of turns of a strip made of a metal foil 14 and of a polymer film 25. Only one turn of the film and parts of adjacent turns of the metal foil are shown in the figure.
  • the metal foil 14 is of the type described with reference to FIG. 2.
  • the polymer film has a thickness of 50 ⁇ m.
  • layers 26 and 27 of cellulose paper with a thickness of 10 ⁇ m are applied on each side of the polymer film 25. These layers therefore belong to the tape when it is wound up for tape winding.
  • depressions 15, 16 and 11 extend to the edges of the metal foil, they are in communication with the space 28 adjoining the end faces 29 and 30 of the windings 21 and 22.
  • the windings are vacuum dried at elevated temperature and then subjected to vacuum pressure impregnation with a suitable insulating liquid, such as transformer oil, or a suitable insulating gas, for example SF 6 .
  • a suitable insulating liquid such as transformer oil, or a suitable insulating gas, for example SF 6 .
  • Straight-line depressions in the metal foil do not have to run obliquely to the edges of the metal foil, but can also run perpendicular to these edges.

Landscapes

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

Claims (6)

1. Enroulement électrique à ruban pour des appareils électriques, par exemple des transformateurs ou des inductances, enroulement à ruban (21, 22) qui est constitué par plusieurs spires, enroulées l'une sur l'autre, d'un ruban qui comporte une feuille métallique (10,14) et au moins un film d'un polymère, ladite feuille métallique servant de conducteur et le film polymère d'isolant dans l'enroulement, alors que la feuille métallique est pourvue sur au moins un des ses côtés, de creux allongés (11, 15, 16), caractérisé par le fait que pour obtenir une imprégnation complète de l'enroulement à ruban, les creux, s'étendent dans l'enroulement à ruban jusqu' à l'espace (28) voisin des surfaces d'extrémité (29, 30) de l'enroulement à ruban, communiquent avec cet espaces et ne produisent pas des parties saillantes sur le côté opposé de la feuille.
2. Enroulement à ruban selon la revendication 1, caractérisé par le fait que les creux (11, 15 et 16) s'étendent parallèlement entre eux de l'une des surfaces d'extrémité de l'enroulement à ruban à l'autre surface d'extrémité de l'enroulement à ruban.
3. Enroulement à ruban selon la revendication 1 ou 2, caractérisé par le fait que les creux (15, 16) s'étendent avec des directions croisées sur le même côté de la feuille métallique.
4. Enroulement à ruban selon l'une des revendications précédentes, caractérisé par le fait que les creux (11, 15, 16) ont une profondeur de 2-50 µm et une largeur maximale de 2 à 50 µm.
5. Enroulement à ruban selon l'une des revendications 2 à 4, caractérisé par le fait que la distance entre les centres de deux creux voisins et parallèles (11,15,16) est de 1-30 mm.
6. Enroulement à ruban selon l'une des revendications précédentes, caractérisé par le fait que le ruban de l'enroulement à ruban comporte au moins une couche de papier (26,27).
EP81107670A 1980-10-06 1981-09-26 Bobine électrique à bandes pour appareils électriques Expired EP0049444B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8006974A SE423943B (sv) 1980-10-06 1980-10-06 Transformator eller reaktor
SE8006974 1980-10-06

Publications (2)

Publication Number Publication Date
EP0049444A1 EP0049444A1 (fr) 1982-04-14
EP0049444B1 true EP0049444B1 (fr) 1984-12-05

Family

ID=20341908

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107670A Expired EP0049444B1 (fr) 1980-10-06 1981-09-26 Bobine électrique à bandes pour appareils électriques

Country Status (6)

Country Link
EP (1) EP0049444B1 (fr)
JP (1) JPS5799715A (fr)
DE (1) DE3167640D1 (fr)
NO (1) NO813350L (fr)
SE (1) SE423943B (fr)
ZA (1) ZA816862B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4312950A1 (de) * 1993-04-21 1994-10-27 Abb Patent Gmbh Magnetischer Auslöser für ein elektrisches Schaltgerät

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BG62541B1 (bg) * 1997-03-19 2000-01-31 "Изоматик Лаб." ООД Намотка на трансформатор за електросъпротивително заваряване

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2365867A1 (fr) * 1976-09-22 1978-04-21 Alsthom Savoisienne Bobinages en feuilles metalliques
SE415418B (sv) * 1978-12-08 1980-09-29 Asea Ab Transformator eller reaktor samt sett att framstella en sadan

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4312950A1 (de) * 1993-04-21 1994-10-27 Abb Patent Gmbh Magnetischer Auslöser für ein elektrisches Schaltgerät

Also Published As

Publication number Publication date
EP0049444A1 (fr) 1982-04-14
SE423943B (sv) 1982-06-14
ZA816862B (en) 1982-09-29
SE8006974L (sv) 1982-04-07
NO813350L (no) 1982-04-07
JPS5799715A (en) 1982-06-21
DE3167640D1 (en) 1985-01-17

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