WO1989006042A1 - Composant electro-isolant et son procede de fabrication - Google Patents

Composant electro-isolant et son procede de fabrication Download PDF

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Publication number
WO1989006042A1
WO1989006042A1 PCT/EP1987/000807 EP8700807W WO8906042A1 WO 1989006042 A1 WO1989006042 A1 WO 1989006042A1 EP 8700807 W EP8700807 W EP 8700807W WO 8906042 A1 WO8906042 A1 WO 8906042A1
Authority
WO
WIPO (PCT)
Prior art keywords
core part
shrink film
component according
component
shrinking
Prior art date
Application number
PCT/EP1987/000807
Other languages
German (de)
English (en)
Inventor
Walter Eichberger
Josef Jilek
Wilhelm Valenta
Original Assignee
Isovolta Österreichische Isolierstoffwerke Aktieng
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 Isovolta Österreichische Isolierstoffwerke Aktieng filed Critical Isovolta Österreichische Isolierstoffwerke Aktieng
Priority to PCT/EP1987/000807 priority Critical patent/WO1989006042A1/fr
Priority to EP19880900883 priority patent/EP0348395A1/fr
Publication of WO1989006042A1 publication Critical patent/WO1989006042A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies
    • H01B17/58—Tubes, sleeves, beads, or bobbins through which the conductor passes

Definitions

  • the invention relates to an electrically insulating component, such as a high-voltage insulator, consisting of an optionally elongated body, to which electrically conductive fittings are to be attached, and an optionally elongated core part made of a thermosetting synthetic resin reinforced with high-strength fibers made of electrically insulating material, and a has a shell consisting of a polymeric fluorine-containing hydrocarbon, covering at least the largest part of the surface of the core part.
  • a high-voltage insulator consisting of an optionally elongated body, to which electrically conductive fittings are to be attached
  • an optionally elongated core part made of a thermosetting synthetic resin reinforced with high-strength fibers made of electrically insulating material
  • a shell consisting of a polymeric fluorine-containing hydrocarbon, covering at least the largest part of the surface of the core part.
  • the surface of the shell material consisting of a polymeric fluorine-containing hydrocarbon has a particularly dirt-repellent effect and thus leads to a reduction in the leakage currents flowing on the insulator surface and to a reduction in the risk of spark and arc discharges occurring.
  • An electrically insulating component of this type serving as a high voltage insulator is e.g. known from German patent specification 29 36 822. This component has a mechanically load-bearing rod-shaped core part on which a sheath made of polytetrafluoroethylene (PTFE) is provided with ribs.
  • PTFE polytetrafluoroethylene
  • the invention is first of all based on the object of specifying an electrically insulating component, such as a high-voltage insulator of the type mentioned at the outset, with a shell made of a polymeric fluorine-containing hydrocarbon which is of simple construction and simple to manufacture.
  • an electrically insulating component such as a high-voltage insulator of the type mentioned at the outset
  • the shell consists of one or more foils (s), optionally applied to the surface of the core part, from a polymeric fluorine-containing hydrocarbon, which has a surface layer (5 ) with a thickness in the range between 0.05 and 2.0 mm, but in particular between 0.1 and 0.6 mm.
  • the foils of the surface layer advantageously consist of polytetrafluoroethylene or a fluorinated ethylene-propylene copolymer.
  • the component according to the invention is characterized in that the core part consists of a fiber-reinforced epoxy resin.
  • the core part has a rectangular cross section with rounded edges.
  • the core part is formed by a plate or strip-shaped fiber-reinforced plastic laminate.
  • the component according to the invention is characterized in that the surface regions of the core part, to which the electrically conductive fittings are to be attached or attached, are not covered by the surface layer.
  • a layer of a water-repellent sealing compound is applied in the joints between the edges of the applied surface layer and the core part.
  • This sealing compound can advantageously be one based on a silicone compound.
  • a region of the component surface is provided with a protective lacquer layer on both sides of the edges of the surface layer.
  • the invention is also based on the object of specifying an advantageous method for producing the component according to the invention.
  • the core part is first produced, that a tubular shrink film made of a polymeric fluorine-containing hydrocarbon is then drawn over the core part and then by heat treatment on the surface of the core part is shrunk. It can be advantageous during or after shrinking on the shrink film can be pressed against the surface of the core part by mechanical pressure and / or at least the space between the shrink film and the core part can advantageously be evacuated for shrinking.
  • the inside of the shrink film used is optionally equipped to be adhesive-friendly by etching.
  • the method according to the invention is characterized in that the core part is coated at least over part of its surface with a binder before shrink-fitting the shrink-wrap surface, which is solidified or hardened after the shrink-fitting .
  • a layer of a water-repellent sealant is applied to the surface areas of the elongated core part, on which the end areas of the shrink film will later rest, before the shrink film is shrunk on.
  • the method according to the invention is characterized in that the shrink film on the outer edge areas is optionally provided with a stick-friendly finish by etching, and an area on both sides of the edges of the applied shrink film including the mentioned sticky edge strips is provided with a protective lacquer layer.
  • FIG. 1 shows a partial representation in elevation of a component serving as a high-voltage insulator and FIGS. 2 and 3 corresponding sections along the lines II-II and III-III of FIG. 1.
  • the component 1 has an elongated core part 2 made of glass fiber-reinforced epoxy resin in the form of a profile rod with an approximately rectangular cross section and rounded edges (see FIGS. 1 and 3).
  • This core part 2 is - except for areas 3 in the vicinity of the core part ends 4, which remain free - provided, for example, with a 0.4 mm thick surface layer 5 made of polytetrafluoroethylene. Since the component 1 is constructed symmetrically with respect to its two end regions, the partial representations according to FIGS. 1 and 2 show, for the sake of simplicity, only one of the two end regions of the component 1.
  • the core part 2 is in each case at its ends 3 in the slot-promoting manner Migen recess 6 of a metal fitting 7 and connected to this by bolts 8.
  • component 1 The high voltage to be insulated then usually prevails between the two metal fittings 7 during operation.
  • the component end regions are finally provided with a protective lacquer layer based on PVC, indicated by 9, which also cover the end regions 10 of the surface layer 5.
  • the manufacture of component 1 described above is advantageously carried out as follows:
  • the profile bar forming the core part 2 is e.g. produced from a laminate plate strip made of glass fabric-reinforced epoxy resin by milling the rounded edges (see FIG. 3).
  • an approximately 0.4 mm thick shrink film made of polytetrafluoroethylene is prepared, the circumference of which is about 10 to 50% larger than the circumference of the core part 2 and which is a length equal to the length of the core part minus the double Has length a of area 3.
  • This shrink film tube piece is now etched at both ends by immersing it in an etching liquid, as a result of which the inside and outside of the film surface is made ready for adhesion over a length b by chemical modification of the film surface structure.
  • the shrink film piece of tubing is now pushed onto the core part 2 and the whole is then brought to a temperature of about 300 ° C. in a vacuum oven, at which the piece of tubing shrinks onto the surface of the core part 2.
  • the end areas of the component thus produced are each provided with a protective lacquer layer 9 by an immersion process, which also adheres well to the end areas 10 of the surface layer 5, which were formed from the etched end areas of the shrink film thus preventing moisture from penetrating between the core part 2 and the surface layer 5.
  • component 1 which is now made of polytetrafluoroethylene, is not wetted by water and is extremely dirt-repellent. Stable superficial Layers of dirt can therefore not form or can only form under particularly unfavorable conditions.
  • the leakage currents that occur when a high voltage is applied to the component surface are therefore usually very low and, if the component is correctly dimensioned, there are hardly any discharge phenomena which lead to a change in the component 1 surface.
  • the shrink film is shrunk onto the core part 1 in a vacuum oven.
  • it may now be expedient, e.g. during or after the shrinking on by means of a pressure bag lying against the surface of the shrink film, to press the shrink film against the core part surface until it cools and thus to avoid air inclusions in the joint between the shrink film and the core part surface.
  • the shrink film is connected to the core part surface by gluing.
  • the core part is first coated over that part of its surface on which the shrink film made of polytetrafluoroethylene is to be applied, for example with a binder based on epoxy resin, and then the shrink film tube piece, which has been made adhesive on its entire inside by etching, onto the core part coated with binder is shrunk on, after which the shrink film is pressed against the surface of the core part with the aid of a pressure sack until the binder has hardened.
  • This variant of the method ensures that no air or gas inclusions remain in the joint between the shrink film and the ceramic surface and can no longer accumulate subsequently, for example by diffusion.
  • a sealant for example one based on a silicone compound, can be provided in the joint between the core part surface and the surface layer 5, which is advantageously applied in the form of a shrink film, with an exit of the sealant, for example, through a protective lacquer layer is prevented, which covers the edges of the shrink film forming the surface layer 5.
  • the method according to the invention is - as one can easily see - also for cases in which the core part on which the shrink film tube piece is to be shrunk has a cross section which varies in the length of the core part.
  • FIG. 4 illustrates a first phase of the method in a schematic representation.
  • a cylindrical core part 11 can be seen, over the one end (on the right in FIG. 4) of which a sleeve 12 is slid, which is provided with a connecting piece 13 for connection to a vacuum pump.
  • a narrow, annular gap 14 remains free between the inner surface of the sleeve 12 and the core part surface.
  • a tubular shrink film 15 made of polytetrafluoroethylene is now pushed over the core part 11 and the sleeve 12 and at the ends of the shrink film between the shrink film 15 on the one hand and the other Core part 11 or the sleeve 12, on the other hand, O-sealing rings 16 and 17, respectively.
  • the whole is then inserted into a cylindrical heating device 19 provided with infrared radiators 18, so that the sealing rings 16, 17 remain outside the heating zone of the heating device 19.
  • the air located in the cylindrical gap 20 (see FIG. 4) between the shrink film 15 and the core part 11 is pumped out via the connecting piece 13 of the sleeve 12, while at the same time an air through the infrared radiator 18 on the Shrink temperature of about 300 ° C shrink film section shrunk onto the core part 11.
  • the non-shrinkable ends of the shrink film are separated by circumferential cuts.
  • the process variant described above has i.a. the advantage that the infrared radiator 18 essentially only brings the film section to be shrunk onto the high shrinking temperature of 300 ° C. and the core part made of fiber-reinforced plastic is only subjected to a relatively low thermal load when shrinking on.
  • the process variants described with reference to FIGS. 4 and 5 can also be used particularly advantageously when the shrunk-on film section is to be glued to the core part.
  • a binder layer made from a mixture of a cycloaliphatic - table epoxy resin and a hardener based on poly amines attached.
  • the procedure is then as described above, but the inside of the tubular shrink film made of polytetrafluoroethylene is now etched to improve the bondability.
  • the binder hardens relatively quickly owing to the heat supplied by the hot shrink film, which creates an airtight and watertight connection between the shrunk film and the core part, which has no air pockets.
  • the component according to the invention can now also be produced in a different way than by the method according to the invention.
  • a core part 22 in the form of a profile bar with a rectangular cross section is used, which is coated on its four side surfaces with foils 23 and 24 is coated from polytetrafluoroethylene.
  • the production of the profile rod starts from a laminated sheet which was produced by hot-pressing glass fiber fabrics impregnated with epoxy resin with outer layers made of polytetrafluoroethylene foils 23 which were made adhesive on one side by etching.
  • a strip 25 of such a laminated sheet is glued to its two edge surfaces with a film 24 of the same type as the films 23 with the help of an epoxy resin adhesive. Since the edge surfaces of the foils 23 do not bond well to the foils 24 because of the poor adhesiveness of the edges, the edges of the core part 22 can be provided with a chamfer 26, as indicated on an enlarged scale in FIG. 7 on one of the component edges .
  • the electrically insulating components according to the invention can be used in a variety of ways, in particular as high-voltage insulators for outdoor applications.

Landscapes

  • Laminated Bodies (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

Un composant électro-isolant (1) qui sert éventuellement d'isolateur H.T. et qui se compose d'un corps en matériau isolant sur lequel sont montés des éléments sous tension comprend un noyau (2, 11, 22) éventuellement allongé en plastique duromère renforcé par des fibres qui est pourvu, sur la plus grande partie de sa surface dépourvue d'éléments, d'une couche superficielle (5, 21) en un hydrocarbure fluoré polymère tel que le polytétrafluoroéthylène d'une épaisseur comprise entre 0,05 et 2,0 mm, notamment entre 0,1 et 0,6 mm, et qui se compose d'une pellicule appliquée, le cas échéant collé, sur la surface du noyau. Selon un procédé préférentiel de fabrication de ce composant, on glisse un morceau d'une pellicule tubulaire rétractable en un hydrocarbure polymère sur le noyau et on la rétrécit sur celui-ci à une température élevée. Avant l'application de la pellicule, on peut enduire la surface du noyau d'un adhésif, de façon que la pellicule tubulaire rétractable, dont le côté intérieur est gravé, adhère à la surface du noyau.
PCT/EP1987/000807 1987-12-19 1987-12-19 Composant electro-isolant et son procede de fabrication WO1989006042A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP1987/000807 WO1989006042A1 (fr) 1987-12-19 1987-12-19 Composant electro-isolant et son procede de fabrication
EP19880900883 EP0348395A1 (fr) 1987-12-19 1987-12-19 Composant electro-isolant et son procede de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1987/000807 WO1989006042A1 (fr) 1987-12-19 1987-12-19 Composant electro-isolant et son procede de fabrication

Publications (1)

Publication Number Publication Date
WO1989006042A1 true WO1989006042A1 (fr) 1989-06-29

Family

ID=8165226

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1987/000807 WO1989006042A1 (fr) 1987-12-19 1987-12-19 Composant electro-isolant et son procede de fabrication

Country Status (2)

Country Link
EP (1) EP0348395A1 (fr)
WO (1) WO1989006042A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19920639A1 (de) * 1999-04-29 2000-11-02 Siemens Ag Elektrisch isolierendes Bauteil für eine Hochspannungsanlage
CH698971A1 (de) * 2008-06-04 2009-12-15 Trench Switzerland Ag Isoliereinrichtung.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PT1081423E (pt) 1999-08-17 2001-08-30 Franz Viegener Ii Gmbh & Co Kg Processo e peca moldada para o estabelecimento de uma ligacao prensada entre um acessorio e uma extremidade de tubo introduzida num receptaculo do acessorio

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB915052A (en) * 1958-02-18 1963-01-09 British Insulated Callenders Improvements in or relating to electrical insulators
DE1804422A1 (de) * 1967-10-23 1969-08-28 British Insulated Callenders Elektrischer Isolator und Verfahren zu seiner Herstellung
DE2741547A1 (de) * 1977-09-15 1979-03-29 Rosenthal Technik Ag Streckentrennerisolator
GB2059689A (en) * 1979-09-12 1981-04-23 Pfisterer Elektrotech Karl Section insulator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB915052A (en) * 1958-02-18 1963-01-09 British Insulated Callenders Improvements in or relating to electrical insulators
DE1804422A1 (de) * 1967-10-23 1969-08-28 British Insulated Callenders Elektrischer Isolator und Verfahren zu seiner Herstellung
DE2741547A1 (de) * 1977-09-15 1979-03-29 Rosenthal Technik Ag Streckentrennerisolator
GB2059689A (en) * 1979-09-12 1981-04-23 Pfisterer Elektrotech Karl Section insulator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19920639A1 (de) * 1999-04-29 2000-11-02 Siemens Ag Elektrisch isolierendes Bauteil für eine Hochspannungsanlage
CH698971A1 (de) * 2008-06-04 2009-12-15 Trench Switzerland Ag Isoliereinrichtung.

Also Published As

Publication number Publication date
EP0348395A1 (fr) 1990-01-03

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