EP1054418A1 - Niederspannungswicklung für elektrischen Transformator und Verfahren zu ihrer Herstellung - Google Patents

Niederspannungswicklung für elektrischen Transformator und Verfahren zu ihrer Herstellung Download PDF

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Publication number
EP1054418A1
EP1054418A1 EP00109330A EP00109330A EP1054418A1 EP 1054418 A1 EP1054418 A1 EP 1054418A1 EP 00109330 A EP00109330 A EP 00109330A EP 00109330 A EP00109330 A EP 00109330A EP 1054418 A1 EP1054418 A1 EP 1054418A1
Authority
EP
European Patent Office
Prior art keywords
strip
winding
interlayer
metal strip
turns
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.)
Withdrawn
Application number
EP00109330A
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English (en)
French (fr)
Inventor
Patrick Leupold
Christian Schwinn
Eric Meylan
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.)
France Transfo SAS
Original Assignee
France Transfo SAS
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 France Transfo SAS filed Critical France Transfo SAS
Publication of EP1054418A1 publication Critical patent/EP1054418A1/de
Withdrawn legal-status Critical Current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
    • H01F27/323—Insulation between winding turns, between winding layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/061—Winding flat conductive wires or sheets
    • H01F41/063—Winding flat conductive wires or sheets with insulation

Definitions

  • the invention relates to the field of electrical transformers. More precisely, it concerns the realization of the so-called “Low Voltage” windings of the transformers power or distribution of electrical energy, whether these transformers are of the "dry” or "submerged".
  • the "Low Voltage" windings of the transformers are made of the following way.
  • a strip of a metal that is a good conductor of electricity, such as copper or aluminum, is wound in concentric turns around a support mandrel.
  • an insulating strip is wound between said turns in order to separate them electrically.
  • the insulating strip is made of a material with characteristics high dielectrics, such as mica, synthetic film, or specially treated paper by impregnation of a poly-epoxy resin. After the winding is formed, it is heated so as to carry out the polymerization of the resin and its bonding to the strip metallic to ensure the maintenance of the insulating strip and better cohesion mechanics of the entire winding.
  • the object of the invention is to propose a type of winding which can be manufactured by a traditional manufacturing process, but more economically and more reliably than existing processes, while retaining the usual quality of the winding.
  • the invention relates to a "Low Voltage" winding for electric power transformer or electric power distribution, of the type comprising a metal strip wound in the form of turns separated by a foil electro-insulating interlayer also wound in the form of turns and having a width greater than that of said metal strip so as to have overhangs lateral, characterized in that said overhangs are folded by bearing on the strip metallic to form folds that wrap around the edges and cover the edges of the metal strip while being held in place by inter-turn tightening
  • the invention also relates to a method for manufacturing such a winding, according to which one fixes, by superimposing them on the support mandrel of a turn of winding, the end of a continuous metal strip and that of an interlayer strip electrical insulation also continuous and having an extra width in order to define folding overhangs, an initial overlap is formed on each of the banks of said metal strip by folding down said overhangs on the metal strip, and putting in rotation said support mandrel so as to advance the production of the winding in the form of alternating turns of metallic strip and interlayer strip turns, maintaining the folded overhangs of said interlayer strip against the strip being ensured by inter-turn tightening of the metal strip during the whole duration of the winding operation.
  • the invention consists in replacing the strips of stuffing by a folding of the overhangs of an interlayer strip provided for substantially more wider than usual to form this fold.
  • This one under the tightening effect of the turns metallic between them is pressed during the winding against the bank of the face of the metal strip opposite the face which is in contact with the interlayer.
  • the banks and the edges of the metal strip are thus covered, and this even during the winding operation and without other intervention than a temporary and local fixing of the folded against the surface of the metal strip when the latter forms the first whorl at the start of the operation.
  • An endless metal strip 1 clearly visible in FIG. 3, made of 1.5 mm aluminum mm thick for example, is wound in concentric turns 10. Three turns only successive are shown in Figures 1 and 2. These turns 10 are separated by turns 20 of an electro-insulating strip also in an endless strip 2 (in mica, synthetic material, or paper coated or not with a heat-bonding epoxy resin for example), with a thickness which can range from 0.1 to 0.5 mm approximately.
  • the turns 20 of the insulating strip which is designated more readily by the term "interlayer”, slightly protrude by a distance "d" from each side of the winding in relation to the limits of the metal strip 1.
  • This distance "d” is conventionally of the order of 10-15 mm.
  • the voids which, because of this extra width, appear on each side of the winding between the edges of two consecutive turns 20 of the interlayer 2, are filled with insulating strips 3 and 3 ', also wound in turns 30 and 30 'during the manufacture of the winding.
  • These stuffing strips are made in principle of the same material as interlayer 2 and their thickness is close to that of aluminum sheet 1.
  • FIG. 1 only shows in cross section a portion of the winding, which continues both in the direction of the axis XX and opposite to this direction (as symbolized by the dotted lines 4, 4 ), and that this portion has its symmetry with respect to the axis XX.
  • the "Low Voltage" winding produced according to the invention is shown in FIG. 2.
  • the winding turn to be implemented can advantageously be that used to carry out the winding according to the prior art of FIG. 1, except that it no longer includes the means for supplying insulating strips 3, 3 , or that these means, even still present, are no longer active.
  • the metal strip 1 has a constitution and dimensions quite usual facts, which have already been cited.
  • the interlayer strip 2 has originally a width which, to allow the formation of a stable overlap, markedly exceeds this time, for example by 3 to 12 cm, that of the band metallic 1.
  • the lateral overhangs of the interlayer 2 are, during the manufacture of the winding, folded at 180 ° to come automatically applied, by simple clamping effect of the metal turns between them, against each metal turn 10 corresponding. During this folding movement of the overhang, each overhang comes wrap an edge 9, 9 'of said coil 10 and thus cover its edge 11 (resp. 11') on the opposite side to that which is fully in contact with the coil 20 of the interlayer 2.
  • FIG. 3 shows the support mandrel 6 of the lathe winding in rotation around its axis X-X.
  • the interlayer strip 2 is fixed first on the mandrel 6 over a distance "1" equal to that of the metal strip 1.
  • the latter appreciably narrower than the interlayer, of 20 cm for example, comes to be superimposed on it, taking care to be centered and well aligned with it.
  • the folded portion comes to apply tightly on the metal surface without forming voids or spaces between them, in particular at the edges of the sheet metal edges 9 and 9 '.
  • the width of the covering is therefore equal to that of the initial overhang "r" minus the thickness of the sheet 1. Maintaining this initial covering 8, 8 is very simply ensured by a piece of adhesive tape, or any other means of fixing, even temporary, and the rest of the interlayer strip 2 is left free. Then, the mandrel 6 is rotated, first slowly on the first two turns so as to initiate the winding of the winding, then at nominal speed to continue its progression until its completion.
  • the regular folding of its edges to form the folded parts 5, 5 is done by folding naturally and automatically throughout the winding process without requiring human intervention, since it is initiated by the overlaps 8, 8 made by hand in the first stage of winding manufacturing.
  • This folding is performed automatically before the arrival on the mandrel so that, once folded, the fold 5, 5 'is firmly held in place by the inter-turn tightening effect which is exerted on it by the metallic turns which form on the mandrel 6.
  • the fact of placing, during the winding, the interlayer 2 under the metal strip 1 has the advantage of allowing the operators easy access to the zone of formation of the folded parts 5, 5 . They can easily check at any time whether the installation is working properly.
  • the embodiment according to the invention also has the advantage of in no case leaving the edges 9, 9 of the metal strip 1 exposed to the outside. This makes the winding completely sealed against external agents. On the other hand 'the presence of a double layer of insulating strip 2 at the edges of the metal strip 1 (as seen in Figure 2) strengthens the insulation of these edges.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)
EP00109330A 1999-05-18 2000-05-02 Niederspannungswicklung für elektrischen Transformator und Verfahren zu ihrer Herstellung Withdrawn EP1054418A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9906382 1999-05-18
FR9906382A FR2793942B1 (fr) 1999-05-18 1999-05-18 Bobinage "basse tension" de transformateur electrique et son procede de realisation

Publications (1)

Publication Number Publication Date
EP1054418A1 true EP1054418A1 (de) 2000-11-22

Family

ID=9545785

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00109330A Withdrawn EP1054418A1 (de) 1999-05-18 2000-05-02 Niederspannungswicklung für elektrischen Transformator und Verfahren zu ihrer Herstellung

Country Status (2)

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EP (1) EP1054418A1 (de)
FR (1) FR2793942B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101901674B (zh) * 2009-05-25 2012-09-05 上海飞晶电气股份有限公司 增强非晶合金变压器高压线圈绝缘性及机械强度的方法
CN109494073A (zh) * 2018-11-21 2019-03-19 深圳市吉祥腾达科技有限公司 一种隔离变压器初次级的胶带卷边工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6173318A (ja) * 1984-09-18 1986-04-15 Toshiba Corp 箔巻変圧器の製造方法
US4741947A (en) * 1986-04-24 1988-05-03 Westinghouse Electric Corp. Water-based epoxy patterned porous insulation
US5281488A (en) * 1992-09-15 1994-01-25 Poulsen Peder Ulrik Foil strip conductor
WO1998036849A1 (en) * 1997-02-19 1998-08-27 Abb Power T & D Company Inc. Insulated metallic strip and method for producing same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6173318A (ja) * 1984-09-18 1986-04-15 Toshiba Corp 箔巻変圧器の製造方法
US4741947A (en) * 1986-04-24 1988-05-03 Westinghouse Electric Corp. Water-based epoxy patterned porous insulation
US5281488A (en) * 1992-09-15 1994-01-25 Poulsen Peder Ulrik Foil strip conductor
WO1998036849A1 (en) * 1997-02-19 1998-08-27 Abb Power T & D Company Inc. Insulated metallic strip and method for producing same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 240 (E - 429) 19 August 1986 (1986-08-19) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101901674B (zh) * 2009-05-25 2012-09-05 上海飞晶电气股份有限公司 增强非晶合金变压器高压线圈绝缘性及机械强度的方法
CN109494073A (zh) * 2018-11-21 2019-03-19 深圳市吉祥腾达科技有限公司 一种隔离变压器初次级的胶带卷边工艺

Also Published As

Publication number Publication date
FR2793942B1 (fr) 2002-01-25
FR2793942A1 (fr) 2000-11-24

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