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WO2011023721A1 - Isolateur moulé par injection - Google Patents

Isolateur moulé par injection Download PDF

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Publication number
WO2011023721A1
WO2011023721A1 PCT/EP2010/062389 EP2010062389W WO2011023721A1 WO 2011023721 A1 WO2011023721 A1 WO 2011023721A1 EP 2010062389 W EP2010062389 W EP 2010062389W WO 2011023721 A1 WO2011023721 A1 WO 2011023721A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulator
sleeve
threaded
insulator according
insulating
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.)
Ceased
Application number
PCT/EP2010/062389
Other languages
German (de)
English (en)
Inventor
Karl Vorlicek
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.)
Kuvag & Co KG GmbH
Original Assignee
Kuvag & Co KG 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 Kuvag & Co KG GmbH filed Critical Kuvag & Co KG GmbH
Publication of WO2011023721A1 publication Critical patent/WO2011023721A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • H01B17/14—Supporting insulators
    • H01B17/16—Fastening of insulators to support, to conductor, or to adjoining insulator
    • 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
    • H01B17/32—Single insulators consisting of two or more dissimilar insulating bodies
    • H01B17/325—Single insulators consisting of two or more dissimilar insulating bodies comprising a fibre-reinforced insulating core member
    • 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
    • H01B17/36—Insulators having evacuated or gas-filled spaces

Definitions

  • the invention relates to an insulator, comprising a substantially cylindrical and preferably provided with insulating ribs insulator of injection molding material, which consists of an inner part and a surrounding jacket, wherein on the end faces of the inner part in each case a threaded insert is provided made of metal.
  • Isolators are used in medium-voltage technology for insulated cable routing in cubicles and switch cells. For decades, components made of epoxy material, made of porcelain, glass or as a composite insulator consisting of a glass fiber core, which is coated with silicone or elastomers, proven.
  • duroplastic epoxy insulators which are produced by casting, are preferably used.
  • a mixture of bisphenol A / F epoxy resin with anhydride hardeners, fillers - preferably quartz powder and possibly other additives cast in a mold.
  • DE 7802360 Ul describes an interior support insulator made of polypropylene by injection molding.
  • a molded outer cone bushing is shown by the insulator according to DE 10 2005 059754, which has a conical plastic jacket and a cylindrical plastic inner jacket, which are connected by axially extending stiffeners.
  • An insulating separation plane normal to the axis is not present, so that only small torsional moments due to the upper and lower screw can be recorded.
  • WO03 / 107360 describes a composite insulator having a solid core enclosed by an injection molded finished part. By the solid part no material savings are possible, Furthermore, at the continuous cylinder surface boundary surfaces between the inner part and outer insulating part interfacial discharges occur until the breakdown.
  • US 6031186 shows an insulator consisting of a co-injected inner and outer body. Again, the solid part does not allow weight reduction, as in the solution proposed here. Furthermore, the execution can be performed with solid, injection-molded plastic core only for very small diameters, since the flow paths of sprayable plastic compositions at layer thicknesses greater than about 6 mm very limited and accompanied by the formation of inhomogeneities and voids, which reduce the electrical resistance of the molding extremely.
  • the object of the present invention was therefore a construction of insulators in order to make them more stable and yet easier and more economical.
  • FIG. 2 a is a longitudinal section through an insulator according to the invention
  • FIG. 2 b shows a section along the line BB of FIG. 2 c
  • FIG. 2 c is a bottom view with respect to FIG 2a and 2b
  • Fig. 2d is a top view with respect to Figs. 2a and 2b
  • Fig. 3 shows a further sectional view through the insulator according to the invention of Fig. 2a to 2d
  • Fig. 4 shows 5 shows a further embodiment of a bushing to be used
  • FIG. 6 is a longitudinal section through a bush to be used in the insulator according to the invention
  • FIG. 7 is a longitudinal section by another embodiment of a socket to be used in the insulator according to the invention
  • FIG. 8 shows a longitudinal section through another embodiment of an inventive in the s insulator to be inserted socket
  • Fig. 9 is a cross section through one end of another embodiment of the insulator according to the invention
  • Fig. 10 shows a longitudinal section through yet another embodiment of an insulator of the invention.
  • thermosets or thermosets can be used for the production of the insulators, which allow short cycle times by means of injection molding or with the aid of an extruder.
  • the cycle time compared to the epoxy-ADG process with about 10 minutes mold occupancy time (plus possibly required post-curing time) can be reduced to about 2 minutes total cycle time.
  • the production of an insulator by injection molding requires a fundamentally different construction of the component compared to a component such as that of FIG. 1, which is produced by the casting process.
  • the G cleverharzbauteil is performed according to the prior art as a solidly cast component with almost any dimensions, the mounting sleeves or other inserts are wrapped in the ADG process by the casting resin.
  • the insulator according to the invention is expediently carried out with ribs or struts in order to ensure the mechanical strength.
  • the isolators standardized according to series must be able to withstand defined breaking forces. In the Umbruchskraftstage the insulator is screwed to the bottom (or on the cylinder base) with a base plate of the tester, while at the other end of the insulator a defined test load is applied perpendicular to the cylinder axis. This test load or test torque must at least withstand the insulator.
  • the insulator for a given height must have a sufficient creepage distance between the attachment points: this is the insulator on the outside with a plurality of insulating ribs larger outer diameter than the outer sheath diameter, which are perpendicular to the axis provided. Height, outer diameter, creepage distance and operating voltage are specified in the standards.
  • An injection molded resin insulator must meet this specification as well as a molded insulator to ensure compatibility.
  • FIGS. 2a to 2d and 3 a first preferred embodiment of an insulator according to the invention, which can be produced by injection molding, will be described with reference to FIGS. 2a to 2d and 3.
  • the arranged in a cylinder axis AA, at the obe- ren and the lower cylinder base surface located metal threaded bushings 2 and threaded sleeves 3 are so injection-molded of injection-moldable insulating thermo- or duroplasten plastic material that they are covered by an approximately cylindrical, insulating sleeve 7 insulating material which runs continuously from upper to lower base surface, wherein the closed threaded bushing 2 is completely enveloped at its inside end with thermoplastic material, while the second, inside open threaded sleeve 3 is enclosed only at its outer edges and the circular portion-shaped bottom portion of insulating material.
  • the reinforcing ribs 5 continue into an outer jacket, which is provided with several rib stiffeners along its height. Since this variant of the insulator has an air-filled cavity between the electrodes, the air space should not be sealed tight. This would have a negative effect on the electrical partial discharge behavior.
  • the thread of the threaded sleeve 3 is not gas-tight, so that no increased load occurs. For increased requirements, a small air channel between the cavity and the atmosphere could possibly be provided, for example by a groove milling in the threaded bushing 2.
  • the insulator according to the invention has no closed base surfaces according to FIGS. 2a to 2d, but this does not impair its function in indoor use and still saves weight.
  • one or both sides preferably also thermo- or duroplastic cover plates 14 are provided, which are glued to the insulator or pressed into this.
  • the ribs and parts of the outer cylinder 1 may need to be recessed accordingly to allow a flush support.
  • the sockets 2, 3 can also be made protruding around the plate thickness of the cover plates 14.
  • the insulator in this embodiment, you can fill the volume portion 8 of the hollow cylinder 7 between the metal mounting parts 2, 3 wholly or partially through the open threaded bushing 3 with insulating material.
  • insulating material For example, silicone can be injected, but preferably a cold- or heat-curing epoxy or Poyurethanverguß is made.
  • This mandrel 8a which is needed for the production of the insulator is pushed through the threaded sleeve 3 and causes in the finished part of the cylindrical cavity 8 between the electrodes or threaded elements 2 and 3 and thus provides for uniform wall thickness of the insulating sleeve 7, which comprises the central inserts 2, 3.
  • the open socket 3 can also be "electrically" closed with a metallic disk 11 so that no field strength peaks can form on the thread edges (see FIG. 5)
  • the metal disc-itself already adhesively bonded, pressed or overmolded with the insulating piece 10- can be picked up by the correspondingly shaped and now shorter mandrel 8a and subsequently pressed in.
  • Duro or thermoplastic, cast, injection-molded or cut rod material can also be used as material Pulltrud jewes glass fiber reinforced material can be used.
  • FIG. 1 An even more stable solution is shown in FIG.
  • the mold core 8a for the hollow cylinder 7 is designed with a receptacle for a separate cylinder 10 of insulating material, so that this preassembled on the core insulating cylinder 10 in turn is also encapsulated in the actual manufacturing process.
  • the insulating cylinder 10 may be vorverbunden with a metallic shutter disk 11.
  • the electrical breakdown strength is increased even with otherwise unchanged design of the insulator in the region of the cylindrical hollow cylinder 7 with respect to the embodiments described above.
  • a further advantageous variant is proposed according to the invention in order to avoid the air space or the cavity between the threaded bushes. As shown in FIG.
  • a threaded end sleeve 12 which is offset at the end is used.
  • the insulating cylinder 10a can be made by partially overmolding the threaded sleeve in a separate, upstream manufacturing process.
  • the insulating cylinder 10a can also be pressed onto the bushing 12, which is preferably rounded at its lower end in order to avoid field strength peaks.
  • the upper sleeve 2 and the lower sleeve 13 is fixed with the pressed or injection-molded insulating cylinder 10 b in the mold and then carried out the actual injection molding process. Due to the at least partially double-molded bushing 13 and thus higher insulation thickness, the dielectric strength can be further increased.
  • the injection molding of the insulator according to the invention is carried out in the variants with filled volume 8, preferably by an upper bushing 14 exemplified as in FIG. 8, which is designed for this purpose with a bore.
  • the edges of the bore are preferably rounded to avoid field strength peaks.
  • the cover disks 14 exemplified in FIG. 9 can be attached to the upper or / and lower base surfaces of the insulator by gluing or pressing.
  • the ends of the shell 1 of the insulator are to be carried out accordingly, so that, for example, by lowering the lateral surfaces, these discs 14 are fixed stably with the insulator.
  • the metallic bushes 2, 3, 12, 13, 14 are positioned protruding to the lid thickness during the injection process.
  • another embodiment of the insulator shown in FIG. 10 can also be designed with a plurality of possibly coaxial, rotationally symmetrical reinforcing cylinders 15, which are provided by the reinforcing ribs extending in the axial direction and a partition wall arranged preferably at half the height normal to the axis are connected to the mecanical symmetrical reinforcing cylinders 15, which are provided by the reinforcing ribs extending in the axial direction and a partition wall arranged preferably at half the height normal to the axis are connected to the êtisolierzylinder (or hollow cylinder) and the lateral surface of the insulator.
  • the inner diameter of the insulating sleeve 7 can also be stepped, and / or conical, as well as the radially extending in the axial plane stiffening ribs above and below the horizontal Kriechwegbarriere offset from each other.
  • the insulator may also be fabricated with multiple additional metal inserts 6 on one or both base surfaces, an exemplary embodiment of which is shown in Figs. 2b-2d. Care must be taken to appropriate support between inner insulating sleeve 7 and outer shell 1, since in this area the reinforcing ribs 4 omitted.
  • a base surface sockets 6 are electrically connected to a conductive element, for example with a wire hanger.
  • insulation elements as insulators, for example, feedthroughs can be produced.
  • the conductor of a bushing is then arranged inside the sleeve (7).
  • elastomers can also be used as a base material for the production.
  • UV-resistant - ideally hydrophobic - injection molding material these insulation elements can also be used for outdoor applications.

Landscapes

  • Insulators (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Insulating Bodies (AREA)

Abstract

L'invention concerne un isolateur comportant un corps isolant sensiblement cylindrique et de préférence pourvu de nervures isolantes, réalisé en matériau moulé par injection. L'isolateur est composé d'une partie intérieure et d'une enveloppe périphérique. Sur les côtés frontaux de la partie intérieure, un insert fileté en métal est respectivement prévu. Pour une conception de fabrication simple, toutefois solide, la partie intérieure est formée par une douille tubulaire (7) de laquelle l'enveloppe tubulaire extérieure (1) est espacée, la douille tubulaire (7) et l'enveloppe tubulaire (1) étant reliées l'une à l'autre au moyen de plusieurs nervures de renforcement (4) s'étendant de préférence d'un côté frontal à l'autre. Une paroi de séparation (9) disposée perpendiculairement sur l'axe longitudinal de l'isolateur s'étend à travers au moins une partie des ouvertures longitudinales formées par la douille (7), l'enveloppe (1) et les nervures de renforcement (4). La douille (7), l'enveloppe (1), les nervures de renforcement (4) et toutes les parois de séparation sont formées d'un seul tenant en tant que pièce moulée par injection.
PCT/EP2010/062389 2009-08-28 2010-08-25 Isolateur moulé par injection Ceased WO2011023721A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT13522009A AT508741B1 (de) 2009-08-28 2009-08-28 Spritzguss-isolator
ATA1352/2009 2009-08-28

Publications (1)

Publication Number Publication Date
WO2011023721A1 true WO2011023721A1 (fr) 2011-03-03

Family

ID=43086208

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/062389 Ceased WO2011023721A1 (fr) 2009-08-28 2010-08-25 Isolateur moulé par injection

Country Status (2)

Country Link
AT (1) AT508741B1 (fr)
WO (1) WO2011023721A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2755212A1 (fr) 2013-01-11 2014-07-16 Schneider Electric Industries SAS Isolateur-support moyenne tension
DE102022205236A1 (de) 2022-05-25 2023-11-30 Siemens Energy Global GmbH & Co. KG Isolierstützer
EP4501577A1 (fr) 2023-07-29 2025-02-05 ABB Schweiz AG Procédé de fabrication d'un isolateur moyenne tension moulé par injection et isolateur moyenne tension

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7802360U1 (de) 1978-01-27 1978-05-18 Fritz Driescher Spezialfabrik Fuer Elektrizitaetswerksbedarf, 5144 Wegberg Innenraum-Stützisolator
EP0001231A1 (fr) * 1977-09-19 1979-04-04 Siemens Aktiengesellschaft Procédé pour fabriquer des isolateurs en matière synthétique comportant des écrans pour l'utilisation à l'intérieur et en plein air
DE9203213U1 (de) * 1992-03-06 1992-04-23 Wirthwein, Udo, 6993 Creglingen Stromschienenträger
US6031186A (en) 1995-10-19 2000-02-29 Hubbell Incorporated Solid polymer insulators with eye and clevis ends
WO2003107360A1 (fr) 2002-06-16 2003-12-24 Maclean-Fogg Company Isolateur composite
DE102005059754A1 (de) 2005-12-09 2007-06-21 Siemens Ag Spritzgussgeformte Außenkonusdurchführung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0001231A1 (fr) * 1977-09-19 1979-04-04 Siemens Aktiengesellschaft Procédé pour fabriquer des isolateurs en matière synthétique comportant des écrans pour l'utilisation à l'intérieur et en plein air
DE7802360U1 (de) 1978-01-27 1978-05-18 Fritz Driescher Spezialfabrik Fuer Elektrizitaetswerksbedarf, 5144 Wegberg Innenraum-Stützisolator
DE9203213U1 (de) * 1992-03-06 1992-04-23 Wirthwein, Udo, 6993 Creglingen Stromschienenträger
US6031186A (en) 1995-10-19 2000-02-29 Hubbell Incorporated Solid polymer insulators with eye and clevis ends
WO2003107360A1 (fr) 2002-06-16 2003-12-24 Maclean-Fogg Company Isolateur composite
DE102005059754A1 (de) 2005-12-09 2007-06-21 Siemens Ag Spritzgussgeformte Außenkonusdurchführung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2755212A1 (fr) 2013-01-11 2014-07-16 Schneider Electric Industries SAS Isolateur-support moyenne tension
CN103928201A (zh) * 2013-01-11 2014-07-16 施耐德电器工业公司 中压支承绝缘件
FR3001080A1 (fr) * 2013-01-11 2014-07-18 Schneider Electric Ind Sas Isolateur-support moyenne tension
DE102022205236A1 (de) 2022-05-25 2023-11-30 Siemens Energy Global GmbH & Co. KG Isolierstützer
EP4501577A1 (fr) 2023-07-29 2025-02-05 ABB Schweiz AG Procédé de fabrication d'un isolateur moyenne tension moulé par injection et isolateur moyenne tension
WO2025026935A1 (fr) 2023-07-29 2025-02-06 Abb Schweiz Ag Procédé de fabrication d'un isolant moyenne tension moulé par injection, et isolant moyenne tension

Also Published As

Publication number Publication date
AT508741A1 (de) 2011-03-15
AT508741B1 (de) 2011-12-15

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