EP3007190B1 - Vorprodukt für eine Trockentransformatorhochspannungsspule - Google Patents

Vorprodukt für eine Trockentransformatorhochspannungsspule Download PDF

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Publication number
EP3007190B1
EP3007190B1 EP14003469.5A EP14003469A EP3007190B1 EP 3007190 B1 EP3007190 B1 EP 3007190B1 EP 14003469 A EP14003469 A EP 14003469A EP 3007190 B1 EP3007190 B1 EP 3007190B1
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EP
European Patent Office
Prior art keywords
insulation layer
layer
high voltage
resin
interim
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.)
Active
Application number
EP14003469.5A
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English (en)
French (fr)
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EP3007190A1 (de
Inventor
Benjamin Weber
Jens Tepper
Karl-Heinz Zillmann
Sven Soetebier
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.)
Hitachi Energy Ltd
Original Assignee
ABB Power Grids Switzerland AG
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Publication date
Application filed by ABB Power Grids Switzerland AG filed Critical ABB Power Grids Switzerland AG
Priority to EP14003469.5A priority Critical patent/EP3007190B1/de
Publication of EP3007190A1 publication Critical patent/EP3007190A1/de
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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
    • H01F27/327—Encapsulating or impregnating

Definitions

  • the invention is related to a method for manufacturing a dry transformer high voltage coil according to the preamble of claim 1.
  • EP 0 012 542 A1 discloses a method of making heat curable adhesive coated insulation for transformers.
  • a resin system may contain pigments for coloring.
  • coils for dry transformers in high voltage applications comprise an electrical conductor, which is wound layer wise in radially adjacent layers around a winding axis.
  • the axial winding direction typically changes inbetween radially adjacent winding layers so that a meander-like winding scheme is gained.
  • a voltage difference inbetween adjacent layers occurs, which is lowest, at this axial end of a layer, where the conductor is fed up to the radially above laying layer and which is highest at the axial opposite end of the respective layer.
  • an additional laminar insulation layer inbetween is for example made from a band-like wound prepreg material.
  • Prepreg is a resin impregnated band material wherein the resin is in B-stage. So the resin respectively the band material is of harder consistency, wherein it has to become transferred to its final stage by a curing process at for example 150°C - 170°C. During this curing process the resin is melting back into a liquid state again and solidifies into a crystalline structure with extremely hard consistency. So an interim insulation layer is transformed to a final insulation layer by a curing process.
  • a wound interim insulation layer typically comprises several voids especially in the wedge-shaped areas inbetween adjacent conductors within the same layer.
  • a wound interim insulation layer typically comprises several voids especially in the wedge-shaped areas inbetween adjacent conductors within the same layer.
  • the amount of voids is reduced by providing outer insulation layers with a soft consistency. So the conductor loops which are wound on an outer layer with soft consistency are embedded therein, preferably with half of their diameter. Due to the embedding also the wedge shaped areas inbetween the conductors are filled with the material of soft consistency in an advantageous way. After curing the soft material it will be of hard consistency and suitable insulation material for the insulation layer of the coil.
  • the interim laminar insulation layer comprises an inner insulation layer of hard consistency which is not considerably caveable so that its thickness is not reduced by the winding process whilst that a radial pressure is applied.
  • An outer insulation layer of soft consistency is foreseen on both sides of the inner layer so that as well conductors which are under the interim insulation layer as conductors which are above the interim insulation layers are embedded therein.
  • the number of voids in the interim insulation layer of the pre-product for a coil is reduced in an advantageous way and the number of voids in the cured final insulation layer therewith.
  • the insulation ability of such a layer is improved in an advantageous way.
  • the consistency of the material of the inner insulation layer is as hard, that its thickness profile is not considerably caved while winding the adjacent layer of electrical conductors thereon during manufacturing process. An electrically required minimum insulation thickness inbetween adjacent layer of conductors is ensured therewith. Dependent on the electrical requirements it can be useful to adapt the thickness of the inner insulation layer along the axial length of the coil so that a wedge shaped cross section of the insulation layer is formed.
  • the consistency of the material of the outer insulation layers is as soft that its thickness profile is nearly form-locking caved while the adjacent layer of conductors are wound thereon during manufacturing process.
  • the coil is manufactured from the radial inner layers of conductors respectively insulation to the radial outer layers. So a layer of conductors is embedded into an outer insulation layer and afterwards an outer insulation layer is applied on the layer of conductors. In the ideal case each loop of the layer of conductors is totally embedded in outer insulation layers so that no voids are present in the interim insulation layer.
  • the inner insulation layer comprises a foil.
  • a foil has the advantage, that it has a constant thickness and is as hard, that the thickness is not significantly reduced when a pressure is applied thereon. A constant thickness even under pressure conditions affords a minimum insulation ability of the whole insulation layer.
  • a suitable material for the foil is for example Kapton or PE wherein a suitable thickness is in the range of 100 ⁇ m to 3.5mm.
  • the foil may be covered with a coating that glues the single layers of the interim insulation layer together during the curing process.
  • a foil will not be molten during a curing process.
  • a suitable material for glue is for example resin-based, preferably resin in 'B' stage, what means, that it is in a flexible solid state wherein after remelting the resin in 'B' stage by a curing process a hardening process is initiated.
  • Prepreg is a band-like material with resin in the 'B' stage.
  • the outer insulation layers may have a varying thickness profile corresponding roughly to the outer shape of the layer of conductors to be embedded therein.
  • the cross section of a typical electrical conductor is round so that a helical wedge-shaped area inbetween adjacent loops of conductors is built. Accordingly the shape of the not yet impressed outer insulation layer is thicker in the helical wedge-shaped area. In this case the deformation of the outer insulation layer is not as high if the layer of conductors is wound thereon.
  • the outer insulation layers may comprise a resin impregnateable and/or resin impregnated material.
  • the resin is in the liquid state wherein the resin might become applied during the winding process of the transformer coil or shortly before.
  • the outer insulation layers comprise polyester felt. This is a material with a sufficient soft consistency which additionally has the ability to suck up liquid resin like a sponge. Thus the number of voids in the outer insulation layer is reduced in an advantageous way.
  • the resin impregnateable material respectively the polyester felt is of different color than the resin for impregnation. This facilitates an optical control of the quality of impregnation of the polyester felt.
  • the Polyester felt is of white color and the resin is of black color the impregnated and not impressed polyester felt would be of dark grey color. Any areas of poor impregnation would be white or light gray.
  • other combinations of colors with a preferably high contrast are suitable.
  • the interim laminar insulation layer has been impregnated at least in part during applying it on the layer of electrical conductors thereunder.
  • potential voids in the edge are of inner and outer insulation layers for example are completely filled with liquid resin.
  • the dispensable resin is remaining on the surface of the coil for impregnating further layers which will be applied thereon.
  • a method for manufacturing a dry transformer high voltage coil comprising the step of applying heat on a pre-product for a dry transformer high voltage coil.
  • a temperature of for example 200°C is applied for 2 hours so that the resin can be completely hardened therewith.
  • the formally soft outer insulation layer and the inner layer are combined to a consistent insulation layer of hard consistency.
  • a dry transformer high voltage coil has been manufactured according to the aforementioned method of the invention.
  • the quality of the insulation layers is improved by reducing the number of voids therein.
  • Figure 1 shows an exemplary pre-product for a dry transformer high voltage coil in 1st stage of its production in a sketch 10.
  • a layer 12 of conductor loops 14, 16, 18 is spirally wound around a winding axis 22 on a bobbin 22.
  • Figure 2 shows an exemplary pre-product for a dry transformer high voltage coil in 2nd stage of its production in a sketch 30.
  • an outer insulation layer 32 of soft consistency in this case strip-shaped polyester felt, has been wound around the layer of conductors. Since the material of the outer insulation layer 32 is soft, the outer shape of the layer of conductors is caved therein.
  • Figure 3 shows an exemplary pre-product for a dry transformer high voltage coil in 3rd stage of its production in a sketch 40.
  • the outer insulation layer 42 has been impregnated with a liquid resin also in the wedged areas inbetween the loops of conductors.
  • Figure 4 shows an exemplary pre-product for a dry transformer high voltage coil in 4 th stage of its production in a sketch 50.
  • an inner insulation layer 52 in this case a polyester foil, has been applied on the impregnated outer insulation layer.
  • Figure 5 shows an exemplary pre-product for a dry transformer high voltage coil in 5 th stage of its production in a sketch 60.
  • An outer insulation 62 layer from polyester felt has been applied on the inner insulation layer.
  • Figure 6 shows an exemplary pre-product for a dry transformer high voltage coil in 6 th stage of its production in a sketch 70.
  • the outer insulation layer 72 from polyester felt has been impregnated with liquid resin.
  • Figure 7 shows an exemplary pre-product for a dry transformer high voltage coil in final stage of its production in a sketch 90.
  • a second layer 94 of conductors has been wound around the insulation layer and the first layer 92 of conductors below.
  • a real coil might comprise significant more layers of electrical conductors and insulation layers inbetween.
  • Figure 8 shows an exemplary dry transformer high voltage coil in a sketch 100. Due to a curing process the interim insulation layer with its inner and two outer insulation layers is now converted into a consistent solid final insulation layer 102.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)

Claims (4)

  1. Verfahren zum Herstellen einer Trockentransformator-Hochspannungsspule, umfassend den Schritt des Anwendens von Wärme auf ein Vorprodukt für eine Trockentransformator-Hochspannungsspule, umfassend mindestens zwei radial benachbarte Schichten (12, 92, 94) eines gewickelten elektrischen Leiters (14, 16, 18) mit einer vorläufigen laminaren Isolationsschicht (72) dazwischen, wobei die vorläufige Isolationsschicht (72) dazu vorgesehen ist, durch einen Aushärtungsprozess in eine endgültige Isolationsschicht (102) umgewandelt zu werden, wobei die vorläufige Isolationsschicht (72) eine innere (76) und zwei äußere (32, 42, 62) Isolationsschichten umfasst, von denen die innere (76) eine harte Konsistenz aufweist und die äußeren (32, 42, 62) eine weiche Konsistenz aufweisen, wobei die innere Isolationsschicht (76) eine Folie umfasst, wobei die Konsistenz des Materials der inneren Isolationsschicht (76) so hart ist, dass ihr Dickenprofil nicht wesentlich nachgibt, wenn während des Herstellungsprozesses die benachbarte Schicht (12, 92, 94) elektrischer Leiter (14, 16, 18) darauf gewickelt wird, wobei die Konsistenz des Materials der äußeren Isolationsschichten (32, 42, 62) so weich ist, dass ihr Dickenprofil nahezu formschlüssig nachgibt, wenn während des Herstellungsprozesses die benachbarte Schicht (12, 92, 94) von Leitern (14, 16, 18) darauf gewickelt wird, und wobei die äußeren Isolationsschichten (32, 42, 62) ein mit Harz imprägnierbares Material umfassen,
    dadurch gekennzeichnet, dass
    die äußeren Isolationsschichten (32, 42, 62) mit Harz imprägniert wurden, wobei es sich bei dem mit Harz imprägnierbaren Material um ein Polyesterfilz handelt, das eine andere Farbe als das Imprägnierharz aufweist, wobei eine Kombination aus Farben mit hohem Kontrast verwendet wird, um eine optische Kontrolle der Imprägnierungsqualität des Polyesterfilzes zu erleichtern.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Folie mit einer Beschichtung bedeckt ist, die die vorläufige Isolationsschicht (72) während des Aushärtungsprozesses zusammenklebt.
  3. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die äußeren Isolationsschichten (32, 42, 62) ein variierendes Dickenprofil aufweisen, das etwa der äußeren Form der Schicht (12, 92, 94) von darin einzubettenden Leitern (14, 16, 18) entspricht.
  4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die vorläufige laminare Isolationsschicht (72) zumindest teilweise während ihres Aufbringens auf die Schicht (12, 92, 94) elektrischer Leiter (14, 16, 18) darunter imprägniert wurde.
EP14003469.5A 2014-10-09 2014-10-09 Vorprodukt für eine Trockentransformatorhochspannungsspule Active EP3007190B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14003469.5A EP3007190B1 (de) 2014-10-09 2014-10-09 Vorprodukt für eine Trockentransformatorhochspannungsspule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14003469.5A EP3007190B1 (de) 2014-10-09 2014-10-09 Vorprodukt für eine Trockentransformatorhochspannungsspule

Publications (2)

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EP3007190A1 EP3007190A1 (de) 2016-04-13
EP3007190B1 true EP3007190B1 (de) 2020-05-20

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7114103B2 (ja) * 2020-09-25 2022-08-08 株式会社スーリヤ 高圧トランス

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263196A (en) * 1963-07-16 1966-07-26 Mc Graw Edison Co Encapsulated electrical coil having means to aid impregnation
US4239077A (en) * 1978-12-01 1980-12-16 Westinghouse Electric Corp. Method of making heat curable adhesive coated insulation for transformers
US4554730A (en) * 1984-01-09 1985-11-26 Westinghouse Electric Corp. Method of making a void-free non-cellulose electrical winding
DE3811842A1 (de) * 1988-04-08 1989-10-19 Ant Nachrichtentech Verfahren zum isolieren hochspannungspotentialfuehrender metallteile sowie anordnungen hierzu
EP2390885B1 (de) * 2010-05-26 2013-01-09 ABB Technology AG Verfahren zur Herstellung von Wicklungen für einen Trockentransformator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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