EP0121133A2 - Procédé de fabrication d'un isolateur électrique en matière synthétique et isolateur composite fabriqué suivant le procédé - Google Patents

Procédé de fabrication d'un isolateur électrique en matière synthétique et isolateur composite fabriqué suivant le procédé Download PDF

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Publication number
EP0121133A2
EP0121133A2 EP84102381A EP84102381A EP0121133A2 EP 0121133 A2 EP0121133 A2 EP 0121133A2 EP 84102381 A EP84102381 A EP 84102381A EP 84102381 A EP84102381 A EP 84102381A EP 0121133 A2 EP0121133 A2 EP 0121133A2
Authority
EP
European Patent Office
Prior art keywords
screens
insulator
gap
screen
composite
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Withdrawn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
EP84102381A
Other languages
German (de)
English (en)
Other versions
EP0121133A3 (fr
Inventor
Ottmar Herbst
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.)
Daetwyler AG Schweizerische Kabel Gummi und Kunststoffwerke
Original Assignee
Daetwyler AG Schweizerische Kabel Gummi und Kunststoffwerke
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 Daetwyler AG Schweizerische Kabel Gummi und Kunststoffwerke filed Critical Daetwyler AG Schweizerische Kabel Gummi und Kunststoffwerke
Publication of EP0121133A2 publication Critical patent/EP0121133A2/fr
Publication of EP0121133A3 publication Critical patent/EP0121133A3/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Withdrawn legal-status Critical Current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
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/38—Fittings, e.g. caps; Fastenings therefor
    • 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

Definitions

  • the invention relates to a method for producing an electrical plastic insulator as a composite body, in which rain shields made of an elastomer are attached one above the other and connected to the body on a tensile and pressure-resistant and rigid central body and connected to the body, the shields being prefabricated with a central passage and pushed onto the body and composite insulator produced by the method.
  • Post insulators of great length and large body diameter are almost exclusively made of porcelain. Although these have proven themselves in operation for a long time, their production is still associated with difficulties today. In addition, the intensity of the short-circuit currents has increased over time, which has meant that higher break forces and larger insulator cross-sections have to be mastered. These larger cross-sections are subject to limits in terms of production technology, although the increasing pollution of the air by longer creepage distances, that is to say by increasingly larger screen diameters, is counteracted. Because of the great weight, the required bending strength and the brittleness of the porcelain are, however, limited in terms of production technology. When used, they pose a great risk, since they can burst due to increasing vandalism, eg through shelling, and also due to internal explosion and can cause consequential damage due to the splintering effect.
  • plastic and plastic composite insulators are being used more and more. It is crucial here that such insulators are less sensitive to impact and therefore have less tendency to fall as a result of breakage.
  • insulators of the highest electrical strength can be produced by using appropriate manufacturing methods, which are comparable in reliability to the known porcelain insulators.
  • Such insulators designed primarily as composite bodies, have a central plastic body reinforced with fibers of high strength, for example glass fibers, to which rain protection screens which extend the creepage distance are attached, fittings being attached to the ends of the central body. It is important here that such plastic insulators must be weatherproof and leakage current-proof even when used in the open air.
  • plastic insulators over those made of porcelain is that they are less sensitive to impact and therefore less likely to fall as a result of breakage.
  • the mechanical strength values in particular the tensile and bending strength, can be increased to about 20 times the corresponding values of porcelain.
  • weight savings result of 75% and more or if the same weights are observed, a construction that is more resistant to tensile strength and bending.
  • Plastic insulators are already known in which the central body is prefabricated with the necessary strength properties and the screens as a whole or as a single screen are cast onto them by means of a mold. Closed (DE-OS 1 490 529) or open (DE-PS 2 044 179) forms can be used here. Injection molds (EP application 0033848) can also be used. All of these processes are complex and, moreover, a perfect connection on the contact surface of the central body cannot be guaranteed because of the relatively long hardening process. Gaps can form on these contact surfaces during curing, which can be the cause of an electrical breakdown.
  • the rain shields are made together with the spacer hub, which are pushed one after the other onto the prefabricated, central rod and with this, e.g. be connected by an adhesive (DE-OS 2 650 363).
  • an adhesive DE-OS 2 650 363
  • gaps can form when the adhesive hardens, which means electrical weak points and can lead to the failure of the insulator.
  • This disadvantage also exists if the bores of the rainshields are not designed as a sliding seat but as a press fit.
  • the present process uses the second-mentioned manufacturing process, ie the central body and the rainshields are manufactured separately.
  • the object is to design this method so that a perfect connection, ie without the formation of gaps during curing, is reliably achieved on the surface of the central body, which at the same time achieves both a perfect centering of the rain shields on the central body and favorable space conditions for the execution of the connection.
  • the umbrellas are centered on the body to form an annular gap without play, the circumferential surface of the body and the inner wall of the umbrellas being provided with an adhesion promoter before being pushed together, and the gap is then flowed through by a flowable and curable plastic is closed.
  • the composite insulator produced by the method according to the invention is characterized in that the inner wall of the shields forms an annular space with the outer surface of the body, centering cams distributed around the bore circumference in the end of the hub part remote from the shield part and a connecting edge being arranged in the end near the shield part forms a positive connection with the edge of an adjacent screen that is distant from the screen part.
  • the composite insulator shown in Fig. 1 consists of several parts.
  • Rain shields 2 which are provided with a shield part 3 and a hub part 4, are pushed onto a central body 1 designed as a tube.
  • the hub part 4 defines the distance between two adjacent rain shields 2.
  • the composite insulator has a fitting 5 at each end of the central body 1, which has a flange 6 with bores 7 and a connector 8 connected to the flange.
  • the rainshields 2 which are pushed on and one above the other all have the same shape.
  • edge elements 9, 10 are used, the edge element 9 consisting of the screen part 3 and the hub part 4, but without the special design of the free edge of the hub part 4 and the edge element 10 only of the hub part 4 consists.
  • the central body 1 consists of a plastic tube reinforced with fibers, for example glass fibers.
  • the fiber reinforcement enables the central body 1 to act on the mecha acting on the insulator African stresses without damage, while the concentrically arranged on the body 1, the creepage lengthening rain screens 2 are made of an elastomer.
  • the edge elements 9, 10 are made of the same material.
  • the fittings 5 are made of metal and are used both for the introduction of force or power transmission and for fastening the insulators to scaffolding, mast brackets or the like. and for fastening the parts carrying the electrical voltage.
  • the edge elements 9, 10 form the transition points between the body 1 and the metal fitting 5.
  • the centering and the connection of the rain shields 2 to the central body 1 is described with reference to FIGS. 2-5. It is essential that the screens 2 are centered on the central body and are thus arranged coaxially with the body 1. Nevertheless, there is a gap 13 between the inner wall 11 and the bore 12 of the hub part 4, the width of which is determined by centering cams 14 which are arranged on the inner wall 11 at the end of the hub part 4 remote from the shield part 3. 3 shows three of six centering cams, but a different number of centering cams 14 can also be arranged.
  • the centering cam 14 can be dome-shaped.
  • the end 16 of the hub part 4 near the screen part is designed as a connecting edge.
  • the connecting edge is a partially conical extension 17 which is attached to the hub part 4 of an adjacent shield 2 when assembling the insulator.
  • the shield is also at the end near the shield part 16 centered.
  • a snap connection is provided instead of the plug connection according to FIG. 2.
  • a recessed groove 18 is arranged on the inner wall 11, into which a projection 19 engages when the shield is assembled, which is located on the end 15 remote from the shield part 3 on the outside of the hub part 4.
  • the snap connection formed by the recess 18 and the projection 19 serves for centering and also forms a tight connection.
  • An even denser connection is the embodiment of the connecting edge shown in FIG. 5, which, like the connection according to FIGS. 2 and 4, also serves to center the screen.
  • a labyrinth is formed at the end 16 near the shield part by a recessed groove 20 and a projection 21 adjoining it, and at the end 15 remote from the shield part by a projection 22 lying on the outside of the hub part 4 with an adjoining recess 23. In addition to the centering effect, this labyrinth connection achieves a particularly good sealing effect.
  • the insulator is finished by filling the gap 13 with a flowable, curable and weather-resistant mass, for example a silicone elastomer.
  • a flowable, curable and weather-resistant mass for example a silicone elastomer.
  • the two fittings 5 are also connected to the plastic parts. Since the gap 13 has a corresponding width due to the centering cams, the connecting mass can completely fill the annular gap.
  • the annular gap 13 is filled, for example, from above Pour in or from below or from the side by pressing or the like. Depending on the type of filling, the height of the distance cams 14 must be selected. Filling is also possible in such a way that one screen 2 is placed on the body 1 after the other and filled before the next screen 2 is placed.
  • a solvent-based adhesive agent based on silicone or dissolved silicone resin combinations with which the surface of the body 1 and the inner wall 11 of the screen 2 are treated.
  • a gap-free, air-free, electrically high-quality and chemically bonded gap zone is achieved.
  • the insulator described can also have screens of different diameters, e.g. Have intermediate screens.
  • the insulator can be used for very large diameters and also for very large voltages.
  • the body 1 can have different shapes and the tube shown in the examples can also be designed as a rod.

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  • Insulators (AREA)
EP84102381A 1983-03-09 1984-03-05 Procédé de fabrication d'un isolateur électrique en matière synthétique et isolateur composite fabriqué suivant le procédé Withdrawn EP0121133A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH127283A CH662901A5 (de) 1983-03-09 1983-03-09 Verfahren zur herstellung eines elektrischen kunststoffisolators und nach dem verfahren hergestellter kunststoffisolator.
CH1272/83 1983-03-09

Publications (2)

Publication Number Publication Date
EP0121133A2 true EP0121133A2 (fr) 1984-10-10
EP0121133A3 EP0121133A3 (fr) 1988-03-30

Family

ID=4206525

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84102381A Withdrawn EP0121133A3 (fr) 1983-03-09 1984-03-05 Procédé de fabrication d'un isolateur électrique en matière synthétique et isolateur composite fabriqué suivant le procédé

Country Status (2)

Country Link
EP (1) EP0121133A3 (fr)
CH (1) CH662901A5 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2604821A1 (fr) * 1986-10-02 1988-04-08 Ceraver Isolateur composite a revetement isolant surmoule
FR2727561A1 (fr) * 1994-11-30 1996-05-31 Sediver Isolateur electrique, procede de fabrication d'un tel isolateur et dispositif pour la mise en oeuvre du procede
WO2003023792A1 (fr) * 2001-09-12 2003-03-20 Obschestvo S Ogranichennoi Otvetstvennostyu Ooo Alfa Energo Isolant polymère haute tension
CN103559965A (zh) * 2013-10-29 2014-02-05 江苏神马电力股份有限公司 一种辅助伞的安装方法及一种辅助伞
US11791068B2 (en) 2020-04-02 2023-10-17 State Grid Corporation Of China Post insulator and direct current power transmission device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1224626A (en) * 1968-06-18 1971-03-10 Trans Dev Ltd Improvements in electric insulators
DE2610967A1 (de) * 1976-03-16 1977-09-29 Pfisterer Elektrotech Karl Isolator
DE2821857A1 (de) * 1978-05-19 1979-11-22 Licentia Gmbh Verbundisolator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1224626A (en) * 1968-06-18 1971-03-10 Trans Dev Ltd Improvements in electric insulators
DE2610967A1 (de) * 1976-03-16 1977-09-29 Pfisterer Elektrotech Karl Isolator
DE2821857A1 (de) * 1978-05-19 1979-11-22 Licentia Gmbh Verbundisolator

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2604821A1 (fr) * 1986-10-02 1988-04-08 Ceraver Isolateur composite a revetement isolant surmoule
EP0264684A1 (fr) * 1986-10-02 1988-04-27 Sediver, Societe Europeenne D'isolateurs En Verre Et Composite Isolateur composite à revêtement isolant surmoule
AU601224B2 (en) * 1986-10-02 1990-09-06 Societe Anonyme Dite Ceraver Complete insulator having insulating coating molded thereover
FR2727561A1 (fr) * 1994-11-30 1996-05-31 Sediver Isolateur electrique, procede de fabrication d'un tel isolateur et dispositif pour la mise en oeuvre du procede
EP0720181A1 (fr) * 1994-11-30 1996-07-03 Sediver, Societe Europeenne D'isolateurs En Verre Et Composite Isolateur électrique, procédé de fabrication d'un tel isolateur et dispositif pour la mise en oeuvre du procédé
US5973272A (en) * 1994-11-30 1999-10-26 Sediver Societe Europeene D'isolateurs En Verre Et Composite Composite insulator with insulating tapered rings providing a transition surface between endpieces and support inserted with the endpieces, a method of manufacturing such an insulator, and apparatus for implementing the method
WO2003023792A1 (fr) * 2001-09-12 2003-03-20 Obschestvo S Ogranichennoi Otvetstvennostyu Ooo Alfa Energo Isolant polymère haute tension
CN103559965A (zh) * 2013-10-29 2014-02-05 江苏神马电力股份有限公司 一种辅助伞的安装方法及一种辅助伞
CN103559965B (zh) * 2013-10-29 2017-11-17 江苏神马电力股份有限公司 一种辅助伞的安装方法及一种辅助伞
US11791068B2 (en) 2020-04-02 2023-10-17 State Grid Corporation Of China Post insulator and direct current power transmission device

Also Published As

Publication number Publication date
CH662901A5 (de) 1987-10-30
EP0121133A3 (fr) 1988-03-30

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Inventor name: HERBST, OTTMAR