EP2372724A1 - Procédé de fabrication d'une bobine durcie aux UV d'un transformateur - Google Patents

Procédé de fabrication d'une bobine durcie aux UV d'un transformateur Download PDF

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Publication number
EP2372724A1
EP2372724A1 EP10157476A EP10157476A EP2372724A1 EP 2372724 A1 EP2372724 A1 EP 2372724A1 EP 10157476 A EP10157476 A EP 10157476A EP 10157476 A EP10157476 A EP 10157476A EP 2372724 A1 EP2372724 A1 EP 2372724A1
Authority
EP
European Patent Office
Prior art keywords
fibres
mandrel
impregnated
curing
curable matrix
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Withdrawn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
EP10157476A
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English (en)
French (fr)
Inventor
Anna Di Gianni
Lars E. Schmidt
Lennart Wihlsson
Patrick Meier
Stéphane Sschaal
Jonas Jonsson
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 Research Ltd Switzerland
ABB Research Ltd Sweden
Original Assignee
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
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.)
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Publication date
Application filed by ABB Research Ltd Switzerland, ABB Research Ltd Sweden filed Critical ABB Research Ltd Switzerland
Priority to EP10157476A priority Critical patent/EP2372724A1/de
Publication of EP2372724A1 publication Critical patent/EP2372724A1/de
Withdrawn legal-status Critical Current

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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
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H01F27/325—Coil bobbins
    • 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
    • H01F41/098—Mandrels; Formers

Definitions

  • the invention relates to coils of transformers.
  • the invention relates to a method of manufacturing a coil body of a transformer utilizing UV curing, and to a coil body of a transformer manufactured according to the method.
  • the manufacturing process of a coil body of a transformer may consist of four steps.
  • step 1 the electrically conductive coil is manufactured.
  • step 1 the fibres (rovings or fabrics) are soaked with a polymeric resin in an impregnation bath. Afterwards (step 2) they are wound to a rotating mandrel until the required wall thickness is achieved.
  • step 3 an electrically conductive coil is formed by winding a conductor around the first layer of fibres. Afterwards a further fibre layer is wound around the rotating mandrel.
  • step 4 the obtained composite, in which the impregnating resin is still liquid and needs to be cured, is placed in a hot oven for the thermally induced cross-linking process.
  • the coated coil In order to have a homogeneous resin distribution, within the whole composite, the coated coil has to be rotated also in the oven.
  • the complete cure can take from few hours up to one day depending on the size of the manufactured piece and on the curing kinetics of the polymeric resin.
  • a method of manufacturing a coil body of a transformer utilizing UV-curing comprising the steps of providing fibres, impregnating the fibres with an UV-curable matrix by an impregnation device, forming a tubular coil body of a transformer by using the fibres, and curing the UV-curable matrix by exposing the impregnated fibres to UV-radiation emitted from an UV light source.
  • the UV-curable matrix may embed comparably strong and stiff components, for example in elongated form, such as the above mentioned fibres, forming a composite.
  • the composite is a mix of fibres and the matrix.
  • the matrix is designed for mechanically and/or chemically cross-linking at least one component such as an organic component, for example one of a polymeric resin, a vinyl ester, a polyurethane, an epoxy resin, an acrylic resin, an anhydride, an amine, an acrylate system, a methacrylate system, a styrene, an unsaturated polyester, a vinyl ether, an unsaturated ester, an imide, a cinnamate system, a chalcone system, a stilbazolium system, and a combination thereof, when being cured forming a fibre/matrix mixture or composite.
  • Such a composite may show marked anisotropy meaning that their properties vary significantly when measured in different directions, for example because possible fibres are aligned in
  • Such a coil body of a transformer may for example be used for insulating the windings of a transformer.
  • Such a manufacturing method may provide a higher flexibility and efficiency on manufacturing a coil body of a transformer because of the possibility to manufacture a multiple layer structure and because of no material losses due to dripping.
  • material losses can be approximately 10% of the matrix compared to a manufacturing process without UV-curing with material loss due to dripping because the impregnation matrix is liquid until a thermal induced cross-linking process starts.
  • dripping matrix is collected and reused. For sensitive applications this can be dangerous because of an additional risk of contamination and trapped air bubbles.
  • Thermal curing of wet wound coils of transformers may be replaced by UV-curing or a combination of UV-curing and thermal curing according to such a method.
  • the method is characterized by simplicity, enables to have a more flexible design of the coil body of a transformer, reduced volatile organic compound (VOC) emission, if required, and reduced material losses.
  • VOC volatile organic compound
  • a short solidification time of liquid matrix may be enabled by such a method as well as essentially no material losses because no dripping occurs. Furthermore emissions of VOCs such as anhydrides due to evaporation which could lead to allergisation of the workers and environmental issues are avoidable, if required, using the above mentioned method.
  • Another advantage of such a method is that an occupation time of a mandrel can be reduced because the long thermal curing step may be omitted.
  • High throughputs without numerous expensive mandrels may be provided by a manufacturing of the coil body of a transformer due to the method because the coil body of a transformer can be manufactured without any time losses and without any time intervals continuously.
  • Such a method provides for an easy change of fibre types and/or matrix types within the production of the same coil body of a transformer as the liquid may not be liquid during the winding process. Therefore, a multiple layer structure can be achieved which gives more flexibility in the optimization of the coil body properties, e.g. enabling to have a chemical resistant inner and/or outer layer and a high mechanical performance material in the bulk. Inhomogeneity and mixture of different matrix types may be dissolved or be minimized.
  • Such a method enables a higher variability on designing the coil body of a transformer as it is possible to manufacture a multiple layer structure. If thermal post curing is applied or needed, no continuous rotation of the mandrel is needed during the thermal curing.
  • the above mentioned formed tubular coil body of a transformer may be hollow.
  • tubular coil body of a transformer may be have at least partially the form of a shell.
  • the coil body thickness and/or wall thickness may vary along a longitudinal axis and/or a radial axis of the tubular coil body of a transformer.
  • the form of the cross-section of the tubular coil body of a transformer may be at least partly circular, rectangular, triangular, cylindrical, poliangular, and combinations thereof.
  • the form of the cross section of the tubular coil body of a transformer may be non-circular.
  • the form and/or size of the cross section of the tubular coil body of a transformer may vary along the longitudinal axis of the tubular coil body of a transformer.
  • a coil body of a transformer may be manufactured using a UV-curable matrix to impregnate the fibres.
  • the matrix may be exposed to an UV-light source, which may be placed directly after the impregnation bath and/or along the mandrel.
  • the reactivity of the matrix may be controlled in a way that the liquid state is long enough to obtain strong and void-free interface between the individual plies.
  • glass fibres are often preferred as fillers.
  • aramid, basalt, polyethylene naphthalate (PEN) or polyethylene teraphthalate (PET) fibres can also be used.
  • As impregnation matrix a thermally curable anhydride/epoxy or amine/epoxy matrix system is often used, as it allows obtaining coil bodies of a transformer with good mechanical and electrical properties.
  • a reactivity and a viscosity of the matrix may be controlled, and the mandrel and an impregnation bath may be heated or cooled accordingly.
  • the winding process may be divided in different steps in which the UV-curable matrix and/or the fibres may be changed.
  • a corrosion or heat resistant matrix/fibre system may be used for example to form an inner layer of about 1 mm thickness and can be cured in situ.
  • another matrix-/fibre system which has high mechanical performance may be used.
  • another matrix/fibre may be used in order to obtain, as outer shell, a UV-resistant layer.
  • already impregnated fibres such as pre-impregnated fibres
  • the fibres may be impregnated by a bath or may already be pre-impregnated and wound on another mandrel before being wound from the other mandrel around the mandrel for manufacturing the coil body of a transformer and the UV-curing of the fibres at the mandrel.
  • the UV-curing may also take place at the other mandrel which enables to omit the step of winding the pre-impregnated fibres from the other mandrel to the mandrel.
  • the UV-curing can proceed parallel to the winding.
  • the fibres can be wound around the mandrel, impregnated at the mandrel, and afterwards UV-cured.
  • the UV-light source may be arranged at a winding head that is movable along the mandrel, for example next to an eye such as a fibre payout eye, through which the fibres are directed to the mandrel before the winding to the mandrel.
  • the UV-light source may have a length of 10-20 cm or may be as long as the mandrel, for example 2-10 m, for example by using multiple UV bulbs.
  • a spot-light source or a UV light emitting diode can be used as UV source.
  • the UV-light source may emit UV-radiation continuously or in certain time intervals such as 1 second to 1 minute.
  • the UV-light source is arranged along the mandrel.
  • the fibres or the fibre rovings may have a thickness of about 15-200 ⁇ m and a width of about 1-5 mm.
  • rovings of 2 to 48 single rovings may be wound on the mandrel together in one step.
  • the rovings may form a band with a width of 1 cm to 10 cm.
  • fibre types such as woven fabrics instead of fibres.
  • the woven fabrics may have the form of a tape of a range of 1cm to 15cm in width in order to be able to wind the woven fabrics in a certain angle around the mandrel or may have the form of a fabric to wind the woven fabrics in one step along the complete mandrel length.
  • the manufactured coil body of a transformer may be one of a composite insulator, a hollow composite insulator, and a hollow core insulator.
  • the coil body may be the coil body of a dry transformer.
  • the manufactured coil body may comprise a conductor and an insulator, wherein conducting and insulating layers may be wound in alternating layers.
  • the method is a continuous method wherein the fibres are wound with a velocity of 0,1-1 m/s.
  • the forming of the tubular coil body of a transformer comprises the step of winding the fibres around the mandrel.
  • the forming of the method further comprises the steps of arranging at least one device on a first layer of the wound fibres and winding a second layer of fibres such that the at least one device is covered at least partially by the second layer of fibres.
  • the at least one device may be integrated in the coil body of the transformer.
  • the at least one device is a coil.
  • the at least one device is a coil of a transformer.
  • the at least one device is an electrically passive device.
  • the at least one device is a field control electrode.
  • the at least one device is a device selected from the group consisting of a metal layer, a metal grid, an active sensor, a passive sensor, an aluminium layer, a metal foil, and an aluminium foil.
  • the at least one device is a device selected from the group consisting of a metal conductor, a metal wire, a copper wire, an aluminium wire, an insulated copper wire, and an insulated aluminium wire.
  • the at least one device is a device selected from the group consisting of a semi-conductive layer, consisting of semi conductive materials containing for example metal oxide ceramics, Silicone carbide, graphite or other semi-conductive materials.
  • the above mentioned method further comprises the steps of providing a matrix, forming a first layer of a tubular coil body of a transformer by UV-curing and/or thermal curing the matrix.
  • the UV-curing and/or thermal curing may take place after winding the fibres around the mandrel.
  • the UV-curing and/or thermal curing may take place after winding the fibres around the wound fibres and the thereon arranged at least one device.
  • the at least one device may be wound around the wound fibres at the mandrel.
  • the at least one device may be wound around a mandrel in a first step, and fibres may be wound around the mandrel with the wound at least one device in a second step. Afterwards, in a third step, further fibres may be wound around the layer of wound fibres.
  • a plurality of layers of fibres may be wound around the mandrel before arranging the at least one device at the wound fibres and after arranging the at least one device at the wound fibres.
  • an integrated at least one device is wound around a first layer of fibres and forms a spiral embedded in the UV-cured insulation.
  • the fibres are impregnated at the mandrel during the winding of the fibres around the mandrel.
  • the fibres are impregnated before the winding.
  • the fibres are pre-impregnated at a first position before the winding and impregnated at a second position at the mandrel during the winding.
  • the impregnation device is an impregnation bath.
  • the method further comprises the step of thermally curing the UV-curable matrix by a thermal source.
  • the thermal curing proceeds after the UV-curing.
  • partly thermal curing is carried out before the UV-curing.
  • At least a first percentage of the UV-radiation is directed towards the fibres at a first position before the fibres are wound around the mandrel.
  • At least a second percentage of the UV-radiation is directed at a second position at the mandrel.
  • the UV-light source is movable along the mandrel and along the fibres before the fibres are wound around the mandrel.
  • the method further comprises the step of controlling a reactivity of the matrix such that a liquid state of the matrix is long enough to obtain a strong and void-free interface between individual plies of impregnated fibres.
  • the method further comprises the step of controlling at least one of a reactivity and a viscosity of the matrix by controlling the temperature of the mandrel and the impregnation device.
  • the method further comprises the steps of winding first fibres which are impregnated by a first UV-curable matrix around the mandrel, curing the first UV-curable matrix by exposing the first impregnated fibres to the UV-radiation, winding second fibres which are impregnated by a second UV-curable matrix around the mandrel, curing the second UV-curable matrix by exposing the second impregnated fibres to the UV-radiation, winding third fibres which are impregnated by a third UV-curable matrix around the mandrel, and curing the third UV-curable matrix by exposing the third impregnated fibres to the UV-radiation.
  • the first impregnated fibres form, in combination with the impregnating first UV-curable matrix, at least one of a corrosion resistive layer and a heat protection layer.
  • the second impregnated fibres form, in combination with the impregnating second UV-curable matrix, a mechanical stabilizing layer, wherein the third impregnated fibres form, in combination with the impregnating second UV-curable matrix, an UV-resistant layer.
  • the matrix is one of the group comprising a vinyl ester, a polyurethane, an epoxy resin, an acrylic resin, an anhydride resin matrix, an amine resin matrix, an acrylate system, a methacrylate system, a styrene, an unsaturated polyester, a vinyl ether, an unsaturated ester, an imide, a cinnamate system, a chalcone system, a stilbazolium system, a polymeric resin, and combinations thereof.
  • the fibres are one of the group comprising glass fibres, polyesters, basalt, aramids in form of one of strands, fabrics, fleece, roving, and filaments.
  • a pre-impregnated (prepreg) insulation material is UV cured.
  • a method of manufacturing a coil body of a transformer utilizing UV-curing comprising the steps of providing an UV-curable prepreg insulation material, forming a tubular coil body by using the UV-curable prepreg insulation material, and curing the UV-curable prepreg insulation material by exposing the UV-curable prepreg insulation material to UV-radiation emitted from an UV-light source
  • the prepreg insulation material may comprise a partially cured thermosetting polymeric matrix reinforced by long continuous fibers (woven or non-woven). These fibers may be polymeric (aramid, polyester such as PET, and polyamide), natural (rayon, cellulose) or inorganic (glass). These are non-limiting examples. Preferrably epoxy/single tow glass fibers are used.
  • the prepreg insulation material may be electrically insulating.
  • the coil body of a transformer is the insulator of a transformer.
  • a device for manufacturing a coil body of a transformer comprising an impregnating device, for impregnating fibres with an UV-curable matrix, a mandrel for winding the fibres, and an UV-light source for emitting UV-radiation to the impregnated fibres for curing the UV-curable matrix.
  • a plurality of units providing single fibres that are wound to a single fibre thread or filament consisting of a plurality of fibres is provided.
  • the impregnation device is movable in a direction along the mandrel and in a direction of the fibres before being wound around the mandrel, for example perpendicular to the direction along the mandrel.
  • the mandrel is movable in a direction along the mandrel and in a direction of the fibres before being wound around the mandrel, for example perpendicular to the direction along the mandrel.
  • the UV-light source is movable in a direction along the mandrel and in a direction of the fibres before being wound around the mandrel, for example perpendicular to the direction along the mandrel.
  • the device further comprises a thermal source for thermally curing the UV-curable matrix.
  • the thermal source is movable along the mandrel and along the impregnated fibres before the fibres are wound to the mandrel.
  • the device further comprises a first direction unit for directing at least a first percentage of the UV-radiation towards the fibres, before the fibres are wound to mandrel, and a second direction unit for directing at least a second percentage of the UV-radiation towards the mandrel.
  • the first direction unit is movable in a direction along the mandrel and in a direction along the fibres before the fibres are wound around the mandrel, for example perpendicular to the direction along the mandrel.
  • the first direction unit is rotatable such that it may direct UV-radiation to the fibres before the fibres are wound around the mandrel and at the mandrel with the wound fibres.
  • the second direction unit is movable in a direction along the mandrel and in a direction along the fibres before the fibres are wound around the mandrel, for example perpendicular to the direction along the mandrel.
  • the second direction unit is rotatable such that it may direct UV-radiation to the fibres before the fibres are wound around the mandrel and at the mandrel with the wound fibres.
  • the first and second direction units form a single direction unit for directing the at least first percentage and the at least second percentage of the UV-radiation towards the mandrel and/or the fibres before the fibres are wound around the mandrel.
  • the device further comprises a first controlling unit for controlling at least one of a reactivity and a viscosity of the UV-curable matrix by controlling a temperature of the mandrel and the impregnating device, and comprises a second controlling unit for controlling the impregnating device, the mandrel, and the UV-light source in such a way, that UV-curable matrices and fibres are impregnated, wound and cured to layers with different characteristics, such as corrosion and heat protective, mechanically stabilizing, UV-resistance.
  • the layers may be manufactured and arranged one after another.
  • the first and second controlling unit can be one controlling unit.
  • a coil body of a transformer is manufactured according to the method of one of the preceding embodiments.
  • the coil body of a transformer may be a high voltage coil of a transformer.
  • the coil body of a transformer comprises a photoinitiator and by-products resulting from the chemical reaction of the photoinitiator with the UV-radiation.
  • the UV-cured matrix and the fibres of the tubular coil body of a transformer are selected from the UV-curable matrices according to one of the above mentioned embodiments.
  • the photoinitiator is designed for initiating polymerization of the UV-cured matrix and the fibres.
  • the coil body of a transformer may be a high voltage coil of a transformer.
  • the photoinitiator is selected from the group comprising sulfonium salts, iodonium salts, triflates, sulfonates, aryl-alkyl ketones, benzophenone, benzophenone derivates, quinones, camphorquinone, xanthone, xanthone derivates, thioxanthone, thioxanthone derivates, fluorenone derivates, benzyl, benzyl derivates, and combinations thereof.
  • the by-products are common by-products resulting from the chemical reaction involving a photoinitiator as mentioned above.
  • Fig. 1A shows a method 100 of manufacturing a coil body of a transformer utilizing UV-curing with the steps of providing fibres, impregnating the fibres with an UV-curable matrix by an impregnation device 101, forming a tubular coil body of a transformer by using the fibres 102, curing the UV-curable matrix by exposing the impregnated fibres to UV-radiation emitted from an UV-light source 103, thermally curing the UV-curable matrix by a thermal source 104, and controlling at least one of the reactivity and a viscosity of the matrix by controlling the temperature of the mandrel and the impregnation device 105.
  • the UV-light source may be arranged at a winding head movable along the mandrel, next to an eye, for example a fibre payout eye, through which the fibres may be directed before the winding to the mandrel.
  • the UV-light source may have a length of 10-20 cm or may be as long as the mandrel, for example 2-10 m, for example by using multiple UV bulbs.
  • a spot-light source or a UV light emitting diode may be used as UV source.
  • the UV-light source may emit UV-radiation continuously or inserted time intervals such as 1 second to 1 minute.
  • the UV-light source may be arranged along the mandrel.
  • Fibres, or fibre rovings may have a thickness of about 15-200 ⁇ m and a width of about 1-3 mm. Alternatively there can be used fibre types such as woven fabrics. Instead of winding single rovings around the mandrel several rovings of 2 to 48 single rovings may be wound on the mandrel together in one step. The rovings may form a band with a width of 1 cm to 10 cm.
  • the manufactured coil body of a transformer may comprise a composite insulator, a hollow composite insulator, a hollow core insulator, and/or a dry insulator, and may be the coil body of a dry transformer.
  • the coil of a transformer may comprise a conductor and insulation.
  • the method according to Fig. 1A and according to Fig. 1B may be a continuous method wherein the fibres may be wound with a velocity of 0.1 - 1 m/s.
  • the fibres may be wound according to the method with a respectively higher velocity, such as 2 m/s, for example.
  • the forming of the tubular coil body of a transformer 102 may comprise the steps of winding the fibres around the mandrel, arranging at least one device on a first layer of the wound fibres, and winding a second layer of fibres such that the at least one device is covered at least partially by the second layer of fibres (202), such that the at least one device may be integrated in the tubular coil body of a transformer.
  • the at least one device may be a device selected from the group consisting of a metal layer, a metal grid, an active sensor, a passive sensor, an aluminium layer, a metal foil, and an aluminium foil.
  • the UV-curing and also thermal curing may take place after winding the fibres around the mandrel.
  • the UV-curing and/or thermal curing may take place after winding the fibres around the wound fibres and the thereon arranged at least one device.
  • the at least one device may be wound around the wound fibres at the mandrel.
  • the at least one device may be wound around a mandrel
  • fibres may be wound around the mandrel with the wound at least one device
  • further fibres may be wound around the layer of wound fibres.
  • a plurality of layers of fibres may be wound around the mandrel before arranging the at least one device at the wound fibres and also after arranging the at least one device at the wound fibres.
  • Fig. 1B shows another method of manufacturing a coil body of a transformer utilizing UV-curing, comprising the following steps: Providing fibres, impregnating the fibres with an UV-curable matrix by an impregnation device 101, forming a tubular coil body of a transformer by using the fibres 102, curing the UV-curable matrix by exposing the impregnated fibres to UV-radiation emitted from a UV-light source 103, thermally curing the UV-curable matrix by a thermal source 104, controlling at least one of a reactivity and a viscosity of the matrix by controlling the temperature of the mandrel and the impregnation device 105, winding first fibres which are impregnated by a first UV-curable matrix around the mandrel 106, curing the first UV-curable matrix by exposing the first impregnated fibres to UV-radiation 107, winding second fibres which are impregnated by a second UV-curable matrix around the
  • the method of Fig. 1B can also comprise the step of controlling a reactivity of the matrix such that a liquid state of the matrix is long enough to obtain a strong and void-free interface between individual plies of impregnated fibres.
  • the UV-light source of Fig. 1A and Fig. 1B may be movable around the mandrel and along the fibres before the fibres are wound around the mandrel.
  • the thermal curing may take place after the UV-curing, for example there may be a partly thermal curing before the UV-curing.
  • the fibres may be impregnated at the mandrel during the winding of the fibres around the mandrel.
  • the fibres may be impregnated before the winding, for example pre-impregnated at a first position before the winding and impregnated at a second position at the mandrel during the winding.
  • Fig. 1A and Fig. 1B may be designed such that at least a first percentage of the UV-radiation is directed towards the fibres at a first position before the fibres are wound around the mandrel, and wherein at least the second percentage of the UV-radiation is directed at a second position at the mandrel.
  • the first impregnated fibres may form, in combination with the impregnated first UV-curable matrix, at least one of a corrosion resistive layer and a heat protection layer.
  • the second impregnated fibres may form, in combination with the impregnating second UV-curable matrix, a mechanical stabilizing layer.
  • the third impregnated fibres may form, in combination with the impregnating third UV-curable matrix, an UV-resistant layer.
  • the matrix may be one of the group comprising a vinyl ester, a polyurethane, an epoxy resin, an acrylic resin, an anhydride, an amine, an acrylate system, a methacrylate system, a styrene, an unsaturated polyester, a vinyl ether, an unsaturated ester, an imide, a cinnamate system, a chalcone system, a stilbazolium system, a polymeric resin, and combinations thereof.
  • the UV-curable matrix 203 may comprise a photoinitiator.
  • the photoinitiator is designed for initiating polymerization of the UV-cured matrix 203 and the fibres 202.
  • the photoinitiator is selected from the group comprising sulfonium salts, iodonium salts, triflates, sulfonates, aryl-alkyl ketones, benzophenone, benzophenone derivates, quinones, camphorquinone, xanthone, xanthone derivates, thioxanthone, thioxanthone derivates, fluorenone derivates, benzyl, benzyl derivates, and combinations thereof.
  • the UV-curable matrix 203 may comprise a thermal catalyst for reinforcing the composite of the UV-curable matrix 203 and the fibres 202.
  • the fibres 202 may be one of the group consisting of glass fibres, polyesters, basalts, aramids in form of one of strands, fabrics, fleece, roving, and filaments.
  • Fig. 2A shows a device 200 for manufacturing a coil body of a transformer according to the methods of Fig. 1A and Fig. 1B , comprising an impregnating device 201 for impregnating fibres 202 with an UV-curable matrix 203, a mandrel 204 for winding the fibres 202, and an UV-light source 205 for emitting UV-radiation 206 to the impregnated fibres 202 for curing the UV-curable matrix 203.
  • the fibres 202 Before the fibres 202 are impregnated, and wound around the mandrel 204, the fibres may be wound around another mandrel 216.
  • a plurality of units (not shown) providing single fibres may wind the single fibres to one fibre thread 202 or filament 202.
  • a thermal source 208 may be applied for thermally curing the UV-curable matrix 203 and may be arranged at the mandrel 204 to provide thermal curing after the impregnated fibres 202 are wound around the mandrel 204.
  • the thermal source 208 may be movable along the mandrel 204 and along the fibres 202 before they are wound around the mandrel 204.
  • the fibres 202 After being wound of the mandrel 216 the fibres 202 pass an impregnation device 201 such as an impregnation bath 202 with an UV-curable matrix 203 are impregnated by the UV-curable matrix 203 and a afterwards directed to an eye 219, such as a fibre payout eye 219, of a movable winding head 218.
  • the fibres 202 are directed through the eye 219 to be wound around the mandrel 204.
  • the winding head 218 is movable in an X-direction along the mandrel 204 and in a Z-direction along the fibres 202 before the fibres 202 are wound around the mandrel, for example a Z-direction vertical to the longitudinal direction of the mandrel 204.
  • the mandrel 204 may have a length of 2-10 m.
  • the UV-light source 205 is arranged at the winding head 218 and is designed for emitting UV-radiation 206 towards the fibres at a first position before the fibres 202 are wound around the mandrel 204.
  • the UV-light source 205 is also designed for emitting UV-radiation 206 in a direction at a second position towards the mandrel 204.
  • the winding head 218 is movable along the mandrel 204 and along the fibres 202 before the fibres 202 are wound around the mandrel 204.
  • a first controlling unit 214 for controlling at least one of a reactivity and a viscosity of the UV-curable matrix 203 of the impregnation bath 201 is applied to control a temperature of the mandrel 204 and the impregnation device 201.
  • a second controlling unit 215 is designed for controlling the impregnation device 201, the winding head 218, the UV-light source 205, the mandrel 216, and the mandrel 204 in such a way, that UV-curable matrices 203 and fibres 202 are impregnated, wound and cured to layers with different characteristics, such as corrosion and heat protective, mechanically stabilizing, and UV-resistance.
  • the layers are manufactured and arranged one after another.
  • Fig. 2B shows a cross-sectional view of the device 200 for manufacturing a coil body of a transformer of Fig. 2A .
  • First fibres 2201, second fibres 2211 and third fibres 2221 are wound around a mandrel 216.
  • the first fibres 2201 pass an impregnation device 201 with a first UV-curable matrix 2031 and are impregnated by the first UV-curable matrix 2031 before passing through the eye 219 of the winding head 218.
  • the first UV-curable matrix 2031 is then cured by exposing the first impregnated fibres 2201 to the UV-radiation 206 emitted by the UV-radiation source 205 at the winding head 218, and afterwards the cured first UV-curable matrix 2031 and the fibres are wound around the mandrel 204.
  • the wound and impregnated first fibres 2201 may comprise a first UV-curable matrix 2031 that may be thermally cured by a thermal source 208.
  • the first fibres 2201 form, in combination with the impregnated first UV-curable matrix 2031, at least one of a corrosion resistive layer and a heat protection layer 2202.
  • second fibres 2211 are wound from the mandrel 216, pass the impregnation bath 201 and are impregnated by a second UV-curable matrix 2032 before passing through the eye 219 of the movable winding head 218 and being exposed to the UV-radiation 206 emitted by the UV-light source 205.
  • the impregnated second fibres 2211 are then wound around the mandrel 204.
  • the second UV-curable matrix 2032 of the wound second fibres 2211 may be thermally cured by the thermal source 208.
  • the second impregnated fibres 2211 form, in combination with the impregnating second UV-curable matrix 2032, a mechanically stabilizing layer 2212.
  • the third fibres 2221 are wound from the mandrel 216, pass the impregnating bath 201 and are impregnated by a third UV-curable matrix 2033 before passing through the eye 219 of the winding head 218 and being exposed to the UV-radiation 206 emitted by the UV-light source 205.
  • the third UV-curable matrix 2033 of the wound third fibres 2221 may be thermally cured by the thermal source 208.
  • the third impregnated fibres 2221 form, in combination with the impregnated third UV-curable matrix 2033, an UV-resistive layer 2222.
  • Fig. 2C is a schematic view of a device 200 for manufacturing a coil body of a transformer according to the methods of Fig. 1A and Fig. 1B .
  • Fibres 202 which are wound around the mandrel 216 are guided by an eye 219 of a winding head 218 to another mandrel 204 and wound around the mandrel 204.
  • an UV-light source 205 which emits UV-radiation 206 to the fibres 202 before being wound around the mandrel and at the wound fibres 202 at the mandrel 204.
  • the head 218 and the UV-light source 205 are movable in a X-direction along the mandrel as well as in a Z-direction towards the fibres 202 before the fibres 202 are wound around the mandrel 204, for example in a direction perpendicular to the X-direction along the mandrel 204.
  • the fibres 202 are pre-impregnated by an UV-curable matrix.
  • the pre-impregnated fibres are wound around a mandrel 216 before being wound around the mandrel 204.
  • the UV-curing of the UV-curable matrix may also be carried out directly at the mandrel 216 with the pre-impregnated fibres 202 wound around the mandrel 216.
  • the UV-cured UV-curable matrix of the wound fibres 202 may be thermally cured by a thermal source 208 which is arranged along the mandrel 204.
  • the thermal source 208 may be movable in a direction along the mandrel 204 and in a direction along the fibres 202 before they are wound around the mandrel 204 according to the embodiments of Fig 2A to Fig. 2D .
  • the first controlling unit 214 is applied for controlling the temperature of the mandrel 204 for controlling a reactivity of the UV-curable matrix being already applied at the pre-impregnated fibres 202.
  • a second controlling unit 215 is adapted for controlling the mandrel 204, the mandrel 216, the winding head 218, and the UV-light source 205 in such a way, that UV-curable matrices and the pre-impregnated fibres 202 are wound and cured to layers with different characteristics, such as corrosion, and heat protective, mechanical stabilizing and UV-resisting layers, wherein the layers are manufactured and arranged one after another (see Fig. 2B ).
  • Fig. 2D schematically shows a device 200 for manufacturing a coil body of a transformer according to the methods of Fig. 1A and Fig. 1B .
  • Pre-impregnated fibres are re-wound from the mandrel 216 and are directed through an eye 219 of a winding head 218 at which an UV-light source 205 is arranged.
  • the winding head 218 guides the pre-impregnated fibres 202 to a mandrel 204 in such a way, that the pre-impregnated fibres are wound around the mandrel 204.
  • a first directing unit 209 is applied for directing at least a first percentage of the UV-radiation 210 emitted by the UV-light source towards the fibres 202 at a first position 210 before the fibres 202 are wound around the mandrel 204.
  • a second direction unit 211 is applied for directing at least a second percentage of the UV-radiation 212 emitted by the UV-light source 205 at a second position 212 at the mandrel after the pre-impregnated fibres 202 are wound around the mandrel 212.
  • the UV cured UV-curable matrix of the wound fibres 202 may be thermally post-cured by a thermal source 208 which is arranged along the mandrel.
  • the first direction unit 209 and the second direction unit 211 are movable in a X-direction along the mandrel 204 and in a Z-direction along the fibres 202 before the fibres are wound around the mandrel 204, for example perpendicular to the X-direction along the mandrel 204.
  • the first direction unit 209 and the second direction unit 211 are rotatable such that they may direct UV-radiation 210, 212 individually to the fibres 202 before the fibres 202 are wound around the mandrel 202 and at the mandrel 204 with the wound fibres 202.
  • the first direction unit 209 and second direction unit 211 may form a single direction unit for directing the at least first percentage of UV-radiation 210 and the at least second percentage of UV-radiation 212 towards the mandrel 204 and/or the fibres 202 before the fibres 202 are wound around the mandrel 204.
  • a first controlling unit 214 is designed for controlling the reactivity of the pre-impregnated fibres 202, especially the UV-curable matrix of the pre-impregnated fibres 202, by controlling a temperature of the mandrel 204.
  • a second controlling unit 215 is designed for controlling the mandrel 216, the mandrel 204, the UV-light source 205, the winding head 218, the thermal source 208, the first direction unit 209, and the second direction unit 211 in such a way, that UV-curable matrices with the pre-impregnated fibres 202 are wound and cured to layers for example with different characteristics, such as corrosion and heat protection, mechanical stabilizing, and UV-resistance, wherein the layers are manufactured and arranged one after another (see Fig. 2B ).
  • the first direction unit 209 and the second direction unit 211 may be selected of the group consisting of a reflector, an UV reflecting matrix, and an UV-reflecting grid.
  • Fig. 2E shows a schematic presentation of a device 200 for manufacturing a coil body of a transformer according to the methods of Fig. 1A and Fig. 1B comprising a mandrel 216 onto which fibres 202 are wound.
  • the wound fibres 202 are re-wound from the mandrel 216 and guided by a winding head 218 through an eye 219 to be wound around another mandrel 204.
  • the movable head 219 is movable along the mandrel 204 in an X-direction.
  • the fibres 202 after being wound around the mandrel 204, impregnated by an impregnation device 201 with an UV-curable matrix 203 directly at the mandrel 204.
  • the UV-curable matrix of the wound fibres is UV-cured by UV-radiation 206 emitted by an UV-light source 205 which is arranged along the mandrel.
  • the impregnation device 201 is also arranged along the mandrel 204.
  • a first controlling unit 214 is adapted for controlling at least one of a reactivity and a viscosity of the UV-curable matrix 203 by controlling a temperature of the mandrel 204 and of the impregnation device 201.
  • a second controlling unit 215 is adapted for controlling the impregnation device 201, the movable winding head 218, the mandrel 216, the mandrel 204, and the UV-light source 205 in such a way, that UV-curable matrices 203 and fibres 202 are impregnated, wound and cured to at least one layer or layers which different characteristics, such as a corrosion and a heat protective, mechanically stabilizing, UV-resistance, wherein the layers may be manufactured and arranged one after another (see Fig. 2B ).
  • the first and the second controlling unit 214, 215 may be integrated to one controlling unit according to the embodiments of Fig. 2A to Fig. 2E .

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulding By Coating Moulds (AREA)
EP10157476A 2010-03-24 2010-03-24 Procédé de fabrication d'une bobine durcie aux UV d'un transformateur Withdrawn EP2372724A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10157476A EP2372724A1 (de) 2010-03-24 2010-03-24 Procédé de fabrication d'une bobine durcie aux UV d'un transformateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10157476A EP2372724A1 (de) 2010-03-24 2010-03-24 Procédé de fabrication d'une bobine durcie aux UV d'un transformateur

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EP2372724A1 true EP2372724A1 (de) 2011-10-05

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54124070A (en) * 1978-03-22 1979-09-26 Mitsubishi Electric Corp Manufacturing of resin-molede coil
WO1999033073A1 (de) * 1997-12-18 1999-07-01 Tyco Electronics Logistics Ag Elektrische spule, insbesondere für ein relais, und verfahren zu deren herstellung
WO2004086429A1 (en) * 2003-03-26 2004-10-07 Kompozitor Muanyagipari Fejleszto Kft. Pressure ring for clamping transformer coils and procedure and equipment for the production of pressure rings

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54124070A (en) * 1978-03-22 1979-09-26 Mitsubishi Electric Corp Manufacturing of resin-molede coil
WO1999033073A1 (de) * 1997-12-18 1999-07-01 Tyco Electronics Logistics Ag Elektrische spule, insbesondere für ein relais, und verfahren zu deren herstellung
WO2004086429A1 (en) * 2003-03-26 2004-10-07 Kompozitor Muanyagipari Fejleszto Kft. Pressure ring for clamping transformer coils and procedure and equipment for the production of pressure rings

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