EP4372773A1 - Verfahren zur herstellung eines transformators - Google Patents

Verfahren zur herstellung eines transformators Download PDF

Info

Publication number
EP4372773A1
EP4372773A1 EP22208680.3A EP22208680A EP4372773A1 EP 4372773 A1 EP4372773 A1 EP 4372773A1 EP 22208680 A EP22208680 A EP 22208680A EP 4372773 A1 EP4372773 A1 EP 4372773A1
Authority
EP
European Patent Office
Prior art keywords
transformer
active part
chemical initiator
capsules
linking
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.)
Pending
Application number
EP22208680.3A
Other languages
English (en)
French (fr)
Inventor
Jedrzej Banaszczyk
Adam Michalik
Michal RZEPECKI
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 Schweiz AG
Original Assignee
ABB Schweiz 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 ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP22208680.3A priority Critical patent/EP4372773A1/de
Priority to PCT/EP2023/081222 priority patent/WO2024110195A1/en
Publication of EP4372773A1 publication Critical patent/EP4372773A1/de
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01F41/12—Insulating of windings
    • H01F41/127—Encapsulating or impregnating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/40—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes epoxy resins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/46—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes silicones
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/47—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes fibre-reinforced plastics, e.g. glass-reinforced plastics
    • 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 present invention relates to a method for producing a transformer, in particular a medium voltage instrument transformer.
  • a mica tape comprising from the top to the bottom a mica paper layer, an adhesive layer and an alkali-free glass cloth layer, where both the mica paper layer and the adhesive layer contain microcapsule curing accelerators.
  • Said microcapsule curing accelerators are suitable for a two-component epoxy anhydride impregnating resin.
  • the microcapsule wall is made of a urea formaldehyde resin, urea resin or polyester resin.
  • the microcapsule core is an imidazole curing accelerator, an amine curing accelerator or acetylacetone.
  • the mica tape might be used for insulation treatment of electrical coil windings e.g. in transformers.
  • PCT patent application WO2017012735A1 discloses a solid, particularly strip-shape insulation material, which can be used in vacuum impregnation process to produce insulation that can be applied in electric industry.
  • the solid insulation material comprises a support, a barrier material, a first curing catalyst and a tape adhesive, wherein said tape adhesive is inert to the first curing catalyst under the conditions of the vacuum impregnation with the cycloaliphatic epoxy groups of a cycloaliphatic epoxy resin.
  • the solid insulation material contains a carrier in the form of fabric, nonwoven fabric, paper and/or in the form of a film.
  • the object of the invention is a method for producing a transformer, in particular a medium voltage instrument transformer, comprising the steps of:
  • the essence of the invention is that after the step of casting the active part of the transformer and before the step of increasing the temperature of said active part to allow cross-linking, a temperature of the active part of the transformer is increased to reduce the viscosity of the impregnation material, and cross-linking is initiated by a temperature higher than the activation temperature of the chemical initiator to release the chemical initiator from the capsules.
  • the insulation material is poly(ethylene terephthalate) non-woven porous fabric, polypropylene non-woven fabric, fiberglass or crepe paper, and the insulation material has distributed on its surface the chemical initiator encapsulated in capsules, and the capsules are adapted to release the chemical initiator in a temperature higher than an activation temperature of the chemical initiator.
  • the presence of the two disclosed steps of increasing temperature in combination with the application of the poly(ethylene terephthalate) non-woven porous fabric, polypropylene non-woven fabric, fiberglass or crepe paper as the insulation material comprising the capsules with the chemical initiator as disclosed above provides a method for producing a transformer with a single casting step, thus leading to its simplification, while still preventing the occurrence of partial discharges in said transformer.
  • This is due to the fact that the disclosed adaptation of the capsules distributed on the surface of the disclosed insulation material causes the impregnation of said insulation material and cross-linking of the impregnation material to occur separately.
  • the impregnation is carried out without starting the cross-linking.
  • the impregnation temperature is raised and the viscosity of the impregnation material is reduced, thereby the impregnation of the disclosed insulation material is more precise than in the solutions known in the prior art and the resulting transformer is less prone to formation of cracks and voids leading to the patrial discharges than the solution known in the prior art.
  • the application of the silicone resin as the impregnation material which after cross-linking has a form of a silicone gel, minimizes the risk of skin irritation when in contact with said silicone gel, which can lead to toxic eczema or allergic skin reactions.
  • the application of the epoxy resin improves mechanical and dielectric properties of the insulation material.
  • the chemical initiator is distributed uniformly on the surface of the insulation material.
  • Uniform distribution of the encapsulated chemical initiator on the surface of the disclosed insulation material prevents undesirable agglomeration of said chemical initiator in the impregnation material leading to non-uniform cross-linking and thus even more prevents from the occurrence of partial discharges in the transformer.
  • the active part of the transformer is placed in a mold or housing and the space between the active part of the transformer and walls of the mold or housing is filled with the insulation material as disclosed.
  • the space between the active part of the transformer and walls of the mold or housing is filled with pieces of the insulation material as disclosed.
  • the disclosed insulation material in particular pieces of said insulation material, improves mechanical properties, especially durability and mechanical strength, of the impregnation material outside the coil structure and reduces the usage of said impregnation material. This is due to the fact that said filling leads to reduction of chemical and thermal shrinkage of the impregnation material, in particular epoxy resin or silicone resin, and resulting stresses in the impregnation material.
  • the impregnation material and the insulation material form the same composite, free of cracks and/or voids, both outside and inside the coil structure. Furthermore, it extends the lifespan of the transformer comparing to the solution known from the prior art.
  • the epoxy resin is a low-viscosity epoxy-resin.
  • the application of the low-viscosity epoxy resin leads to a further improvement in impregnation of the insulation material, as said low-viscosity resin spreads more easily over the impregnated surfaces.
  • the chemical initiator is a hardener, cross-linking agent, catalyst, or an accelerator.
  • the impregnation material is the silicone resin and the chemical initiator is catalyst for addition cured silicones on the basis of precious metal.
  • the application of the catalyst for addition cured silicones on the basis of precious metal eliminates formation of by-products that negatively affect insulating properties of the insulation material.
  • the precious metal is platinum.
  • the catalyst is selected from platinum-carbonyl cyclovinylmethylsiloxane complex, platinum-divinyltetramethyldisiloxane complex or platinum-cyclovinylmethylsiloxane complex.
  • the impregnation material is the silicone resin and the chemical initiator is a cross-linking agent for condensation curing silicones.
  • the cross-linking agent is selected from ethyltriacetoxysilane, methyltriacetoxysilane, di-n-butylbis(2-ethylhexylmaleate)tin.
  • the impregnation material is a low-viscosity epoxy resin and the chemical initiator is a hardener in a form of an anhydrite.
  • the catalyst is selected from HexaHydroPhthalic Anhydride (HHPA), Methylhexahydrophthalic Anhydride (MHHPA) or Methyltetrahydrophthalic Anhydride (MTHPA).
  • HHPA HexaHydroPhthalic Anhydride
  • MHHPA Methylhexahydrophthalic Anhydride
  • MTHPA Methyltetrahydrophthalic Anhydride
  • the method for producing a transformer according to the invention is a cost efficient production process as it is a single casting step method.
  • the method for producing a transformer according to the invention ensures high quality, void-free and crack free structure of the transformer.
  • the method for producing a transformer according to the invention leads to a reduction of scrap rate and costs associated with scrapping the manufactured transformers.
  • the method for producing a transformer according to the invention ensures matching of the coefficient of thermal expansion between a coil of a transformer and its outer insulation.
  • a coil of a transformer 1 is wound 101 with an insulation material 2 comprising capsules 3 with a chemical initiator 4.
  • an active part of the transformer 1 wherein the active part comprises the wound coil with a winding terminal 5 and a core 6.
  • the active part of the transformer 1 is casted 103 with an impregnation material 7, wherein the impregnation material 7 is a silicone resin.
  • the impregnation material 7 is a silicone resin.
  • a GND screen 8 is also covered with the impregnation material 7.
  • the chemical initiator 4 can be a catalyst for addition cured silicones on the basis of precious metal, for example platinum-carbonyl cyclovinylmethylsiloxane complex, platinum-divinyltetramethyldisiloxane complex or platinum-cyclovinylmethylsiloxane complex.
  • the application of the catalyst for addition cured silicones on the basis of precious metal eliminates formation of by-products that negatively affect insulating properties of the insulation material 2. Further, the application of said catalysts ensures a moderate cross-linking speed.
  • the chemical initiator 4 can be a cross-linking agent for condensation curing silicones, for example ethyltriacetoxysilane, methyltriacetoxysilane, di-n-butylbis(2-ethylhexylmaleate)tin.
  • the impregnation material 7 can be an epoxy resin, in particular low-viscosity epoxy resin
  • the chemical initiator 4 can be a hardener in a form of an anhydrite, for example HexaHydroPhthalic Anhydride (HHPA), Methylhexahydrophthalic Anhydride (MHHPA) or Methyltetrahydrophthalic Anhydride (MTHPA).
  • HHPA HexaHydroPhthalic Anhydride
  • MHHPA Methylhexahydrophthalic Anhydride
  • MTHPA Methyltetrahydrophthalic Anhydride
  • the application of the low-viscosity epoxy resin leads to a further improvement in impregnation of the insulation material 2, as said low-viscosity resin spreads more easily over the impregnated surfaces.
  • the chemical initiator 4 can be also an accelerator.
  • a temperature of the active part of the transformer 1 is increased 104 to reduce the viscosity of the impregnation material 7, for example said active part is increased to the temperature of 50-70°C.
  • the viscosity of the impregnation material 7 can be from 1 to 1000 ⁇ 10 -3 Pa ⁇ s at room temperature.
  • Impregnation may last up to several hours, for example 8 hours. Casting and the impregnation are carried out under vacuum conditions.
  • the temperature of the active part of the transformer 1 is increased 105 again to release the chemical initiator 4 from the capsules 3 to allow cross-linking of the impregnation material 7, wherein said cross-linking is initiated by a temperature higher than the activation temperature of the chemical initiator 4.
  • said active part is increased to the temperature of 80-120°C.
  • the cross-linking is carried out until curing of said impregnation material 7.
  • the transformer 1 is cooled 106.
  • the insulation material 2 is poly(ethylene terephthalate) non-woven porous fabric with uniformly distributed on its surface the chemical initiator 4 encapsulated in the capsules 3, and the capsules 3 are adapted to release the chemical initiator 4 in a temperature higher than an activation temperature of the chemical initiator 4.
  • said capsules 3 are adapted to withstand a temperature higher than the activation temperature of the chemical initiator 4.
  • the capsules 3 may be in a form of polymeric microspheres and they may be applied by spraying on the poly(ethylene terephthalate) non-woven porous fabric.
  • the insulation material 2 can be polypropylene non-woven fabric, fiberglass or crepe paper.
  • the presence of the two disclosed steps of increasing temperature in combination with the application of the poly(ethylene terephthalate) non-woven porous fabric or polypropylene non-woven fabric, fiberglass or crepe paper as in the other embodiments as the insulation material 2 comprising the capsules 3 with the chemical initiator 4 as disclosed above provides a method for producing a transformer 1 with a single casting step, thus leading to its simplification, while still preventing the occurrence of partial discharges in said transformer 1. This is due to the fact that the disclosed adaptation of the capsules 3 distributed on the surface of the disclosed insulation material 2 causes the impregnation of the disclosed insulation material 2 and cross-linking of the impregnation material 7 to occur separately.
  • the impregnation is carried out without starting the cross-linking.
  • the impregnation temperature is raised and the viscosity of the impregnation material 7 is reduced, thereby the impregnation of the disclosed insulation material 2 is more precise than in the solutions known in the prior art and the resulting transformer 1 is less prone to formation of cracks and voids leading to the patrial discharges than the solution known in the prior art.
  • uniform distribution of the encapsulated chemical initiator on the surface of the disclosed insulation material 2 prevents undesirable agglomeration of said chemical initiator in the impregnation material leading to non-uniform cross-linking and thus even more prevents from the occurrence of partial discharges in the transformer.
  • the second embodiment of the method for producing a transformer 1 is as in the first embodiment, with the difference that after the step of preparing 102 the active part of the transformer 1 and before the step of casting 103 said active part with the impregnation material 7, the active part of the transformer 1 is placed 107 in a mold 9 or housing and the space between the active part of the transformer 1 and walls of the mold 9 or housing is filled 108 with the insulation material 2, in particular pieces of the insulation material 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)
EP22208680.3A 2022-11-21 2022-11-21 Verfahren zur herstellung eines transformators Pending EP4372773A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22208680.3A EP4372773A1 (de) 2022-11-21 2022-11-21 Verfahren zur herstellung eines transformators
PCT/EP2023/081222 WO2024110195A1 (en) 2022-11-21 2023-11-08 A method for producing a transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22208680.3A EP4372773A1 (de) 2022-11-21 2022-11-21 Verfahren zur herstellung eines transformators

Publications (1)

Publication Number Publication Date
EP4372773A1 true EP4372773A1 (de) 2024-05-22

Family

ID=84360991

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22208680.3A Pending EP4372773A1 (de) 2022-11-21 2022-11-21 Verfahren zur herstellung eines transformators

Country Status (2)

Country Link
EP (1) EP4372773A1 (de)
WO (1) WO2024110195A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5904984A (en) * 1996-10-17 1999-05-18 Siemens Westinghouse Power Corporation Electrical insulation using liquid crystal thermoset epoxy resins
US20080251757A1 (en) * 2005-02-23 2008-10-16 Hisanao Yamamoto Latent Hardener For Epoxy Resin and Epoxy Resin Composition
CN105047256A (zh) 2015-06-30 2015-11-11 株洲时代新材料科技股份有限公司 含微胶囊固化促进剂的云母带及其制备方法
WO2017012735A1 (de) 2015-07-17 2017-01-26 Siemens Aktiengesellschaft Fester, insbesondere bandförmiger, isolationswerkstoff, formulierung für ein imprägniermittel zur herstellung eines isolationssystems in einem vakuumimprägnierverfahren damit und maschinen mit derartigem isolationssystem
WO2017088932A1 (en) * 2015-11-27 2017-06-01 Abb Schweiz Ag Composite insulation material for an electric power cable, process to manufacture a power cable and a power cable containing the insulation material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5904984A (en) * 1996-10-17 1999-05-18 Siemens Westinghouse Power Corporation Electrical insulation using liquid crystal thermoset epoxy resins
US20080251757A1 (en) * 2005-02-23 2008-10-16 Hisanao Yamamoto Latent Hardener For Epoxy Resin and Epoxy Resin Composition
CN105047256A (zh) 2015-06-30 2015-11-11 株洲时代新材料科技股份有限公司 含微胶囊固化促进剂的云母带及其制备方法
WO2017012735A1 (de) 2015-07-17 2017-01-26 Siemens Aktiengesellschaft Fester, insbesondere bandförmiger, isolationswerkstoff, formulierung für ein imprägniermittel zur herstellung eines isolationssystems in einem vakuumimprägnierverfahren damit und maschinen mit derartigem isolationssystem
WO2017088932A1 (en) * 2015-11-27 2017-06-01 Abb Schweiz Ag Composite insulation material for an electric power cable, process to manufacture a power cable and a power cable containing the insulation material

Also Published As

Publication number Publication date
WO2024110195A1 (en) 2024-05-30

Similar Documents

Publication Publication Date Title
US4554730A (en) Method of making a void-free non-cellulose electrical winding
US5139820A (en) Method of manufacturing ceramic insulated wire
EP0422679B1 (de) Verfahren zur Herstellung eines Wickelkabels
JP6506399B2 (ja) 傾斜機能材料の製造方法
CZ20022252A3 (cs) Způsob výroby vysoce kvalitní izolace elektrických vodičů nebo svazků vodičů točivých elektrických strojů sintrováním ve fluidním loži
US11837384B2 (en) Corona-resistant enameled round wire and preparation method therefor
EP4372773A1 (de) Verfahren zur herstellung eines transformators
US3914467A (en) Method of making resin encapsulated electric coil
CN112243560B (zh) 电动机的电绝缘***和其制造方法
US3626587A (en) Methods of constructing electrical transformers
JP2002145996A (ja) 熱硬化性樹脂組成物およびそれを用いた絶縁コイル
JP2007312580A (ja) 樹脂モールドステータの製造方法および樹脂モールドステータ
JP3748324B2 (ja) 回転電機用コイル
JP2908431B1 (ja) 電気絶縁コイルの製造方法
EP3866307B1 (de) Statorspule, verfahren zur herstellung eines stators und elektrische drehmaschine
JP7498098B2 (ja) プリプレグマイカテープ、回転電機及び回転電機の製造方法
CN111524695B (zh) 磁性装置及其制造方法
JP2013005701A (ja) 回転電機用巻線体のワニス含浸処理方法およびその方法によって製作された回転電機用巻線体
JPH05315126A (ja) モールドコイルおよびその製造法
JPH06254972A (ja) 微小空間を埋めた物品の製造方法
JPS5992509A (ja) モ−ルドコイルの製造法
JPH0650696B2 (ja) 樹脂モ−ルドコイルの製造方法
CN115912737A (zh) 一种含热应力松弛层的定子线圈及其制作方法
JPH11307384A (ja) 充填材入り無機ワニスをコイルに含浸する方法
US3115432A (en) Method for producing high temperature electrical insulation

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR