EP0768680A2 - Fil et son procédé de fabrication - Google Patents

Fil et son procédé de fabrication Download PDF

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Publication number
EP0768680A2
EP0768680A2 EP96115883A EP96115883A EP0768680A2 EP 0768680 A2 EP0768680 A2 EP 0768680A2 EP 96115883 A EP96115883 A EP 96115883A EP 96115883 A EP96115883 A EP 96115883A EP 0768680 A2 EP0768680 A2 EP 0768680A2
Authority
EP
European Patent Office
Prior art keywords
coating
core
ceramic material
organically modified
layer
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Withdrawn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
EP96115883A
Other languages
German (de)
English (en)
Other versions
EP0768680A3 (fr
Inventor
Gunter Dr. Börner
Jörg Dr. Puhr-Westerheide
Robert Dr. Huber
Wolfgang Völker
Hans Dr. Nienburg
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 Patent GmbH
Original Assignee
ABB Patent GmbH
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 Patent GmbH filed Critical ABB Patent GmbH
Publication of EP0768680A2 publication Critical patent/EP0768680A2/fr
Publication of EP0768680A3 publication Critical patent/EP0768680A3/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/065—Insulating conductors with lacquers or enamels
    • 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
    • H01B3/308—Wires with resins

Definitions

  • the invention relates to a wire with a metallic core serving as an electrical conductor, and to a method for producing such a wire according to the preamble of claims 1 and 13.
  • Wires of this type are used, for example, in the manufacture of low-voltage motors and are required when these are fed by converters.
  • the wires used up to now have a metallic core that is coated with a varnish.
  • the lacquers used for this purpose consist of purely organic polymers in the form of polyesters, polyamides, polyamide imides or polyurethanes, which are dissolved in phenol or cresol to form the lacquers.
  • the disadvantage here is that the solvents are highly toxic.
  • the polymers themselves are only slightly resistant to partial discharges that occur on the wire surface above a certain field strength.
  • the invention is therefore based on the object of creating a wire which is resistant to partial discharges, and to show a method with which such a wire can be produced simply, inexpensively and at the same time in an environmentally friendly manner.
  • a method with which such a wire can be produced is disclosed in claim 1.
  • a wire that meets the requirements set out in the task is disclosed in claim 13.
  • the wire according to the invention has a core forming the electrical conductor, which is surrounded by a coating directly or with the interposition of an intermediate layer. This has the advantage that it is resistant to partial discharges that occur during the operation of the wires with an inverter.
  • the core of the wire is made of copper, silver, aluminum, zinc, tin or an alloy of two or more of these metals. In addition, it is provided with a round or rectangular cross section. Before the coating is applied, the core is cleaned and, if necessary, subjected to a heat treatment. Among other things, oxide layers are removed, so that the adhesive strength of the subsequent layers on the core is improved.
  • an intermediate layer in the form of an epoxy resin, a polyamide or a polyvinyl acetal can first be applied to the core in a predetermined thickness which is not greater than 10 ⁇ m. If sufficient adhesive strength is to be expected between the core and the layers to be applied due to a suitable choice of materials, the intermediate layer can be dispensed with. If an intermediate layer is used, the coating is then applied to this. According to the invention, an organic / inorganic copolymer is used to form the coating. It has been shown that organically modified ceramic materials are best suited for this.
  • the organically modified ceramic materials are dissolved in alcohols or in ethyl acetate.
  • the advantage of these solvents is that they are significantly less toxic than the phenols and cresols used for standard coatings.
  • solvent-free, organically modified ceramic materials can also be used to form the coatings.
  • the coatings to be formed on a core have a thickness between 10 ⁇ m and 70 ⁇ m.
  • the coatings can be cured with heat after application. Curing can also be carried out using UV, laser, electron or IR radiation. In this case, however, the additional use of an additional photoinitiator is required. However, curing can also be carried out using heat and radiation.
  • a top layer of paraffin forms the outermost layer of the wire according to the invention.
  • a coating in the form of an organically modified ceramic material which is resistant to partial discharge is applied to the metallic core, which is produced in the same manner as described above, directly or with the interposition of an intermediate layer.
  • an additional insulating layer made of polyester, polyamide, polyamide-imide or polyurethane is applied.
  • the insulating layer is preferably completely cured together with the coating during a heat treatment. This achieves a stronger and more stable connection between the coating and the insulating layer.
  • a top layer of paraffin is also applied to them. This can be used to reduce dynamic and static forces that occur, for example, when winding the wires.
  • the wire 1 shown in FIG. 1 is essentially formed by a core 2 made of metal and a coating 4.
  • the core 2 can be made of copper, silver, aluminum, zinc, tin or an alloy of two or more of these metals. In addition, it is provided with a round or rectangular cross section.
  • the core is then cleaned by subjecting it to heat treatment at a temperature between 300 ° C and 600 ° C in a steam atmosphere.
  • an intermediate layer 3 in the form of an epoxy resin, a polyamide or a polyvinyl acetal is first applied to the core in a thickness between 1 ⁇ m and 10 ⁇ m.
  • the intermediate layer can be dispensed with.
  • the coating 4 is then applied to this.
  • a single-phase organic / inorganic copolymer is used to form the coating 4. It has been shown that organically modified ceramic materials are best suited for this.
  • the coating is made of a thioether acrylate silane.
  • tris (2-hydroxyethyl) isocyanurate triacrylate and 3-mercaptopropylmethyldimethoxysilane as well as 10 to 70 mol% tetraethoxysilane based on the thioether acrylate silane are used as starting components for the inorganic condensation.
  • This single-phase organic / inorganic copolymer is described in detail in EP-A-0450624 and EP-A-0451709.
  • a solution is formed from the organically modified ceramic material and an acetic acid ester in the form of butyl acetate or 2-ethoxyethyl acetate.
  • SiO 2 10 to 50% by weight of SiO 2, based on the amount of the organically modified ceramic material used, can be added to the solution to increase the inorganic content.
  • the SiO 2 has a particle size between 50 and 100 nm.
  • This solution is applied to the intermediate layer 3 with the aid of a known coating method. The application is repeated until the coating 4 has the desired thickness. In the finished coating 4, this should be between 10 ⁇ m and 70 ⁇ m.
  • the coating 4 is then cured during a time-defined heat treatment at a temperature between 300 ° C and 600 ° C.
  • the coating 4 can also be cured by means of UV, laser, electron or IR radiation. In this case, however, the use of an additional photoinitiator is required. A combination of heat and radiation likewise enables the coating 4 to harden.
  • a cover layer 6 is then applied to the hardened coating 4, which improves the windability of the wire.
  • Paraffin is preferably used to form the cover layer 6.
  • the thickness of the cover layer 6 is chosen to be less than 1 ⁇ m.
  • the partial discharge stability was measured on wires according to the invention with a core diameter of 0.315 mm and a thickness of the layers applied to the core of 17 ⁇ m, as well as on wires which were produced by known methods. The tests were carried out on standardized twist samples with 23 strokes over a length of 12.5 cm.
  • Fig. 3 shows the Weibull distribution of the life of the tested wires under partial discharge conditions with 1130V peak voltage.
  • the average life of the wires according to the invention is approximately a factor of 60 greater than the life of the wires which are produced by known methods.
  • Fig. 2 shows a variant of the wire shown in Fig.1.
  • the only difference between the two wires 1 is an additional insulating layer 5, which is applied directly to the surface of the coating 4.
  • the same components are therefore provided with the same reference numerals.
  • the core 2 of the wire 1 forming the electrical conductor is produced in the same way and from the same materials as is explained in the description of FIG.
  • the coating 4 is applied directly to the treated core 2 or with the interposition of an intermediate layer 3.
  • the design of the coating 4 is also carried out in the same way as explained in the description belonging to FIG. 1. 1, the coating 4 is only partially cured during the heat treatment.
  • the insulating layer 5 made of polyester, polyamide, polyamide-imide or polyurethane is applied to the coating 4.
  • the insulating layer 5 is fully cured together with the coating 3 during a heat treatment at a temperature defined between 300 ° C. and 600 ° C. Because the insulating layer is applied to the only partially cured coating, a stronger and more permanent connection between the two layers 4 and 5 can be achieved.
  • a covering layer 6, for example made of paraffin is applied to them, as in the embodiment according to FIG. 1. This can be used to reduce dynamic and static forces which occur, for example, when winding such wires 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulated Conductors (AREA)
EP96115883A 1995-10-13 1996-10-04 Fil et son procédé de fabrication Withdrawn EP0768680A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995138190 DE19538190A1 (de) 1995-10-13 1995-10-13 Draht und Verfahren zu dessen Herstellung
DE19538190 1995-10-13

Publications (2)

Publication Number Publication Date
EP0768680A2 true EP0768680A2 (fr) 1997-04-16
EP0768680A3 EP0768680A3 (fr) 1997-07-16

Family

ID=7774794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96115883A Withdrawn EP0768680A3 (fr) 1995-10-13 1996-10-04 Fil et son procédé de fabrication

Country Status (2)

Country Link
EP (1) EP0768680A3 (fr)
DE (1) DE19538190A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999008288A1 (fr) 1997-08-06 1999-02-18 Schenectady International, Inc. Revetement resistant aux decharges partielles destine aux fils laques

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5191144B2 (ja) * 2007-03-02 2013-04-24 矢崎総業株式会社 素線、電線及び素線の製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0126577A1 (fr) * 1983-05-10 1984-11-28 Comm/Scope Company Câble avec adhésif inhibiteur à la corrosion et procédé pour fabriquer celui-ci
US4512920A (en) * 1984-02-01 1985-04-23 National Distillers And Chemical Corporation Silanes useful as anti-treeing additives
GB2210045A (en) * 1987-09-23 1989-06-01 Bp Chem Int Ltd Polymer composition
EP0621607A1 (fr) * 1993-04-20 1994-10-26 Dow Corning Corporation Méthode d'augmentation de la rigidité diélectrique d'un câble par utilisation d'un mélange fluide

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0126577A1 (fr) * 1983-05-10 1984-11-28 Comm/Scope Company Câble avec adhésif inhibiteur à la corrosion et procédé pour fabriquer celui-ci
US4512920A (en) * 1984-02-01 1985-04-23 National Distillers And Chemical Corporation Silanes useful as anti-treeing additives
GB2210045A (en) * 1987-09-23 1989-06-01 Bp Chem Int Ltd Polymer composition
EP0621607A1 (fr) * 1993-04-20 1994-10-26 Dow Corning Corporation Méthode d'augmentation de la rigidité diélectrique d'un câble par utilisation d'un mélange fluide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999008288A1 (fr) 1997-08-06 1999-02-18 Schenectady International, Inc. Revetement resistant aux decharges partielles destine aux fils laques
US6337442B1 (en) 1997-08-06 2002-01-08 Schenectady International, Inc. Coating which is resistant to partial discharges, for enamelled wire

Also Published As

Publication number Publication date
EP0768680A3 (fr) 1997-07-16
DE19538190A1 (de) 1997-04-17

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