EP0071953A1 - Electrically insulating element with a one-part shed group - Google Patents

Electrically insulating element with a one-part shed group Download PDF

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Publication number
EP0071953A1
EP0071953A1 EP82106987A EP82106987A EP0071953A1 EP 0071953 A1 EP0071953 A1 EP 0071953A1 EP 82106987 A EP82106987 A EP 82106987A EP 82106987 A EP82106987 A EP 82106987A EP 0071953 A1 EP0071953 A1 EP 0071953A1
Authority
EP
European Patent Office
Prior art keywords
fins
insulating element
line
joint
discontinuity
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.)
Granted
Application number
EP82106987A
Other languages
German (de)
French (fr)
Other versions
EP0071953B1 (en
Inventor
Alexandre Kaczerginski
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.)
Ceraver SA
Original Assignee
Ceraver SA
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 Ceraver SA filed Critical Ceraver SA
Priority to AT82106987T priority Critical patent/ATE13103T1/en
Publication of EP0071953A1 publication Critical patent/EP0071953A1/en
Application granted granted Critical
Publication of EP0071953B1 publication Critical patent/EP0071953B1/en
Expired legal-status Critical Current

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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
    • H01B17/32—Single insulators consisting of two or more dissimilar insulating bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/54—Processes in making insulators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49227—Insulator making

Definitions

  • the present invention relates to an electrical insulating element comprising a one-piece group of insulating fins.
  • An insulating element comprises an insulating central core, which may be a composite rod made of glass or synthetic fibers belonging to an electrical insulator; it can also be a support such as a cable end of the high-voltage cable type, bushing, or insulator tube for breaking chamber.
  • This central core is generally protected by a waterproof elastomer coating formed by a sheath and / or fins.
  • independent fins are threaded onto the central core previously sheathed, then glued end to end; these fins can also be molded successively by displacement of the mold along said central core.
  • all of the fins are molded simultaneously around said central core.
  • the mold is present at least in two parts which meet so as to define a "joint plane" passing through the axis of the insulating element.
  • a trace which will be called “molding joint” corresponding to the trace of the axial "joint plane”.
  • This trace therefore forms a continuous line from one end to the other of the insulating element and, by favoring the attachment of polluting deposits, causes the appearance of large leakage currents and risks of degradation.
  • the present invention aims to overcome these drawbacks; it relates to an electrical insulating element comprising a monobloc group of molded fins surrounding an insulating core, characterized in that the surface of the block of fins has, between the edges of the two end fins, a discontinuous molding joint.
  • the molding joint has a discontinuity at the edge of at least one of the intermediate fins.
  • This discontinuity can correspond, for example, to an offset of the joint along an arc of about 90 ° along the edge of the fin concerned.
  • FIG 1 a composite insulator 1, having two end fittings 2 and 3 and an insulating element consisting of an insulating rod 10 (see Figure 2) protected by a monoblock group of fins which have been referenced extreme fins 4, 5 and intermediate fins 6, 7 (Figure 1) and 11, 12, 13 ( Figure 2).
  • the insulating assembly is of revolution about an axis 20. It can be seen in FIG. 2 that the molding joint follows a line 21 on the lower surface of the fin 11, the intermediate sleeve between the fins 11 and 12, and the upper part of the fin 12 to its edge 12. The seal undergoes a discontinuity at this level and follows a line 23, situated in the plane of the figure, on the lower surface of the fin 12, the intermediate sleeve between the fins 12 and 13, and the fin 13. We see the line 23 'symmetrical with the line 23 with respect to a plane, orthogonal to the plane of the figure; the symmetrical line of line 21 is not visible in the figure.
  • partial molds are used, each formed from two half-shells.
  • the axial joint planes of two adjacent partial molds are offset from one another so as to achieve the desired discontinuity, at the desired angle (90 ° is only an example).
  • the molding joint may have several discontinuities between the edges of the two end fins 4 and 5.
  • At least one discontinuity can appear on the surface of the sleeves located between two fins.
  • the underside of a fin may be planar, have a draft, or an undercut.
  • the fins can be made of a material chosen from EPDM (Ethylene - Propylene - Diene - Monomer), silicones, polyurethanes, or any other insulating elastomer, epoxides or the like.
  • EPDM Ethylene - Propylene - Diene - Monomer
  • silicones silicones
  • polyurethanes or any other insulating elastomer, epoxides or the like.
  • an insulating element according to the invention reduces the risk of a preferential path of the leakage current along the molding joint.
  • the composite electrical insulator is only one example of application.

Landscapes

  • Insulators (AREA)
  • Insulating Bodies (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Emergency Alarm Devices (AREA)
  • Bridges Or Land Bridges (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

An electrical insulator component comprises a one-piece block of moulded fins (11, 12, 13) disposed around an insulating core (10). The surface of the block of fins includes a moulding line (21, 22, 23) and said moulding line has arcuately displaced segments in that the portion 22 extends circumferentially while the portions 21 and 23 extend longitudinally but in different planes. The net result is that dirt building up along the join line does not form a continuous straight-line low resistance path for leakage currents.

Description

La présente invention concerne un élément isolant électrique comportant un groupe monobloc d'ailettes isolantes.The present invention relates to an electrical insulating element comprising a one-piece group of insulating fins.

Un élément isolant selon l'invention comporte une âme centrale isolante, pouvant être un jonc composite en fibres de verre ou synthétiques appartenant à un isolateur électrique ; elle peut être également un support tel qu'une extrémité de câble du type câble haute tension, traversée, ou tube d'isolateur pour chambre de coupure. Cette âme centrale est généralement protégée par un revêtement étanche en élastomère formé par une gaine et/ou des ailettes.-Selon un premier mode de réalisation connu, des ailettes indépendantes sont enfilées sur l'âme centrale préalablement gainée, puis collées bout à bout ; ces ailettes peuvent être également moulées successivement par déplacement du moule le long de ladite âme centrale.An insulating element according to the invention comprises an insulating central core, which may be a composite rod made of glass or synthetic fibers belonging to an electrical insulator; it can also be a support such as a cable end of the high-voltage cable type, bushing, or insulator tube for breaking chamber. This central core is generally protected by a waterproof elastomer coating formed by a sheath and / or fins. According to a first known embodiment, independent fins are threaded onto the central core previously sheathed, then glued end to end; these fins can also be molded successively by displacement of the mold along said central core.

Selon un second mode de réalisation connu, l'ensemble des ailettes est moulé simultanément autour de ladite âme centrale. Dans ce cas, il est nécessaire que le moule se présente au moins en deux parties se rejoignant de manière à définir un "plan de joint" passant par l'axe de l'élément isolant. Il en résulte qu'il apparaît sur toutes les ailettes une trace que l'on appellera "joint de moulage" correspondant à la trace du "plan de joint" axial. Cette trace forme donc une ligne continue d'un bout à l'autre de l'élément isolant et, en favorisant l'accrochage de dépôts polluants, entraîne l'apparition de courants de fuites importants et de risques de dégradation.According to a second known embodiment, all of the fins are molded simultaneously around said central core. In this case, it is necessary that the mold is present at least in two parts which meet so as to define a "joint plane" passing through the axis of the insulating element. As a result, there appears on all the fins a trace which will be called "molding joint" corresponding to the trace of the axial "joint plane". This trace therefore forms a continuous line from one end to the other of the insulating element and, by favoring the attachment of polluting deposits, causes the appearance of large leakage currents and risks of degradation.

La présente invention a pour but de pallier ces inconvénients ; elle a pour objet un élément isolant électrique comportant un groupe monobloc d'ailettes moulées entourant une âme isolante, caractérisé par le fait que la surface du bloc d'ailettes présente, entre les bords des deux ailettes extrêmes, un joint de moulage discontinu.The present invention aims to overcome these drawbacks; it relates to an electrical insulating element comprising a monobloc group of molded fins surrounding an insulating core, characterized in that the surface of the block of fins has, between the edges of the two end fins, a discontinuous molding joint.

Selon un mode de réalisation, le joint de moulage présente une discontinuité au niveau du bord d'au moins une des ailettes intermédiaires. Cette discontinuité peut correspondre par exemple à un décalage du joint suivant un arc d'environ 900 le long du bord de l'ailette concernée.According to one embodiment, the molding joint has a discontinuity at the edge of at least one of the intermediate fins. This discontinuity can correspond, for example, to an offset of the joint along an arc of about 90 ° along the edge of the fin concerned.

D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description suivante d'un mode de réalisation qui sera faite à l'aide du dessin annexé donné à titre illustratif mais nullement limitatif et dans lequel :

  • - la figure 1 est une vue partielle en élévation d'un isolateur composite selon.1linvention,
  • - la figure 2 montre une vue partielle en élévation d'une partie de l'isolateur de la figure 1.
Other characteristics and advantages of the invention will appear during the following description of an embodiment which will be made using the appended drawing given by way of illustration but in no way limiting and in which:
  • FIG. 1 is a partial view in elevation of a composite insulator according to the invention,
  • - Figure 2 shows a partial elevational view of part of the insulator of Figure 1.

On voit sur la figure 1 un isolateur composite 1, présentant deux ferrures d'extrémités 2 et 3 et un élément isolant constitué par un jonc isolant 10 (voir figure 2) protégé par un groupe monobloc d'ailettes dont on a référencé les ailettes extrêmes 4, 5 et des ailettes intermédiaires 6, 7 (figure 1) et 11, 12, 13 ( figure 2).We see in Figure 1 a composite insulator 1, having two end fittings 2 and 3 and an insulating element consisting of an insulating rod 10 (see Figure 2) protected by a monoblock group of fins which have been referenced extreme fins 4, 5 and intermediate fins 6, 7 (Figure 1) and 11, 12, 13 (Figure 2).

L'ensemble isolant est de révolution autour d'un axe 20. On voit sur la figure 2 que le joint de moulage suit une ligne 21 sur la surface inférieure de l'ailette 11, le manchon intermédiaire entre les ailettes 11 et 12, et la partie supérieure de l'ailette 12 jusqu'à son bord 12. Le joint subit à ce niveau une discontinuité et suit une ligne 23, située dans le plan de figure, sur la surface inférieure de l'ailette 12, le manchon intermédiaire entre les ailettes 12 et 13, et l'ailette 13. On voit la ligne 23' symétrique de la ligne 23 par rapport à un plan, orthogonal au plan de figure ; la ligne symétrique de la ligne 21 n'est pas visible sur la figure.The insulating assembly is of revolution about an axis 20. It can be seen in FIG. 2 that the molding joint follows a line 21 on the lower surface of the fin 11, the intermediate sleeve between the fins 11 and 12, and the upper part of the fin 12 to its edge 12. The seal undergoes a discontinuity at this level and follows a line 23, situated in the plane of the figure, on the lower surface of the fin 12, the intermediate sleeve between the fins 12 and 13, and the fin 13. We see the line 23 'symmetrical with the line 23 with respect to a plane, orthogonal to the plane of the figure; the symmetrical line of line 21 is not visible in the figure.

Pour réaliser un tel ensemble d'ailettes, on met en oeuvre plusieurs moules partiels formés chacun de deux demi-coquilles. Les plans de joint axiaux de deux moules partiels adjacents sont décalés l'un par rapport à l'autre de manière à réaliser la discontinuité voulue, suivant l'angle voulu (90° n'est qu'un exemple).To produce such a set of fins, several partial molds are used, each formed from two half-shells. The axial joint planes of two adjacent partial molds are offset from one another so as to achieve the desired discontinuity, at the desired angle (90 ° is only an example).

Bien entendu le joint de moulage peut présenter plusieurs discontinuités entre les bords des deux ailettes extrêmes 4 et 5.Of course, the molding joint may have several discontinuities between the edges of the two end fins 4 and 5.

Selon un mode de réalisation non représenté, au moins une discontinuité peut apparaître sur la surface des manchons situés entre deux ailettes.According to an embodiment not shown, at least one discontinuity can appear on the surface of the sleeves located between two fins.

L'invention d'applique à toutes les formes d'ailettes, la face inférieure d'une ailette pouvant être plane, présenter une dépouille, ou une contre-dépouille.The invention applies to all forms of fins, the underside of a fin may be planar, have a draft, or an undercut.

(La dénomination "inférieure" est arbitraire et correspond à la disposition de l'isolateur telle qu'elle apparaît dans le dessin).(The name "lower" is arbitrary and corresponds to the arrangement of the insulator as it appears in the drawing).

Les ailettes peuvent être en un matériau choisi parmi l'EPDM (Ethylène - Propylène - Diène - Monomère), les silicones, les polyuréthanes, ou tout autre élastomère isolant, les époxydes ou analogue.The fins can be made of a material chosen from EPDM (Ethylene - Propylene - Diene - Monomer), silicones, polyurethanes, or any other insulating elastomer, epoxides or the like.

Dans tous les cas la structure d'un élément isolant selon l'invention diminue le risque d'un chemin préférentiel du courant de fuite suivant le joint de moulage.In all cases, the structure of an insulating element according to the invention reduces the risk of a preferential path of the leakage current along the molding joint.

Comme on l'a vu plus haut l'isolateur électrique composite n'est qu'un exemple d'application.As we saw above, the composite electrical insulator is only one example of application.

Claims (4)

1/ Elément isolant électrique comportant un groupe monobloc d'ailettes moulées entourant une âme isolante (20), caractérisé par le fait que la surface du bloc d'ailettes présente, entre les bords des deux ailettes extrêmes (4,5), un joint de moulage discontinu (21, 23).1 / Electrically insulating element comprising a monobloc group of molded fins surrounding an insulating core (20), characterized in that the surface of the block of fins has, between the edges of the two end fins (4,5), a seal discontinuous molding (21, 23). 2/ Elément isolant électrique selon la revendication 1, caractérisé par le fait que ledit joint de moulage présente une discontinuité au niveau du bord d'au moins une des ailettes intermédiaires.2 / electrical insulating element according to claim 1, characterized in that said molding joint has a discontinuity at the edge of at least one of the intermediate fins. 3/ Elément isolant électrique selon la revendication 2, caractérisé par le fait que ladite discontinuité correspond à un décalage du joint, d'un arc d'environ 90° suivant ledit bord de l'ailette.3 / electrical insulating element according to claim 2, characterized in that said discontinuity corresponds to an offset of the joint, an arc of about 90 ° along said edge of the fin. 4/ Elément isolant électrique selon la revendication 1, caractérisé par le fait que ledit joint de moulage présente une discontinuité sur la surface d'un manchon compris entre deux ailettes successives.4 / electrical insulating element according to claim 1, characterized in that said molding joint has a discontinuity on the surface of a sleeve between two successive fins.
EP82106987A 1981-08-05 1982-08-03 Electrically insulating element with a one-part shed group Expired EP0071953B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82106987T ATE13103T1 (en) 1981-08-05 1982-08-03 ELECTRICAL INSULATION ELEMENT WITH ONE BLOCK SHIELD GROUP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8115203A FR2511180A1 (en) 1981-08-05 1981-08-05 ELECTRICALLY INSULATING ELEMENT COMPRISING A MONOBLOC FAN GROUP
FR8115203 1981-08-05

Publications (2)

Publication Number Publication Date
EP0071953A1 true EP0071953A1 (en) 1983-02-16
EP0071953B1 EP0071953B1 (en) 1985-05-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP82106987A Expired EP0071953B1 (en) 1981-08-05 1982-08-03 Electrically insulating element with a one-part shed group

Country Status (8)

Country Link
US (1) US4440975A (en)
EP (1) EP0071953B1 (en)
JP (1) JPS5830016A (en)
AT (1) ATE13103T1 (en)
BR (1) BR8204590A (en)
CA (1) CA1179030A (en)
DE (1) DE3263402D1 (en)
FR (1) FR2511180A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6004416A (en) * 1996-07-31 1999-12-21 Pirelli Cavi S.P.A. Shed-formed profile insulating covering and manufacturing method thereof
US6342679B1 (en) 1996-07-31 2002-01-29 Pirelli Cavi S.P.A. Two-layered elastic tubular covering for electric components

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FR2576655B1 (en) * 1985-01-25 1990-02-23 Alsthom Atlantique INSULATING STAY
US5233132A (en) * 1986-10-02 1993-08-03 Sediver Societe Europeenne D'isolateurs En Composite insulator comprising a fiber-resin rod and an insulating coating molded thereover
JPH0734725B2 (en) * 1988-02-23 1995-04-19 加藤 武憲 Squid delicacy and its manufacturing method
FR2657721B1 (en) * 1990-01-26 1992-05-15 Dervaux Ets COMPOSITE INSULATOR AND MANUFACTURING METHOD THEREOF.
US5300912A (en) * 1992-06-09 1994-04-05 Utility Solutions, Inc. Electrical cutout for high voltage power lines
US5830405A (en) * 1993-09-03 1998-11-03 Raychem Corporation Molding methods, track resistant silicone elastomer compositions and improved molded parts with better arcing, flashover and pollution resistance
JP2723468B2 (en) * 1994-03-28 1998-03-09 日本碍子株式会社 Polymer insulator
US6065207A (en) * 1995-03-20 2000-05-23 Ngk Insulators, Ltd. Composite insulators and a process for producing the same
US5822857A (en) 1996-03-18 1998-10-20 Ngk Insulators, Ltd. Method of repairing shed portion of composite insulator
US5945636A (en) * 1996-04-22 1999-08-31 Hubbell Incorporated Electrical insulators with mechanical core and dielectric sheath
US5877453A (en) * 1997-09-17 1999-03-02 Maclean-Fogg Company Composite insulator
US5986216A (en) * 1997-12-05 1999-11-16 Hubbell Incorporated Reinforced insulator
CA2349253C (en) * 2000-12-26 2009-11-17 S&C Electric Company Method and arrangement for providing a gas-tight housing joint
US6831232B2 (en) 2002-06-16 2004-12-14 Scott Henricks Composite insulator
US6952154B2 (en) * 2002-06-16 2005-10-04 Maclean-Fogg Company Composite insulator for fuse cutout
DE502004008461D1 (en) 2003-08-13 2008-12-24 Idas Informations Daten Und Au Method and device for securing a vehicle against theft
US7646282B2 (en) * 2007-12-14 2010-01-12 Jiri Pazdirek Insulator for cutout switch and fuse assembly
CN104599794B (en) * 2015-01-05 2017-05-31 江苏神马电力股份有限公司 The method for maintaining of maintenance umbrella and insulator
EP3591672B1 (en) 2018-07-02 2023-03-29 Hitachi Energy Switzerland AG Insulator with resistivity gradient
EP4007657A1 (en) * 2019-08-01 2022-06-08 Infinite Cooling Inc. Panels for use in collecting fluid from a gas stream
EP4007658A1 (en) 2019-08-01 2022-06-08 Infinite Cooling Inc. Systems and methods for collecting fluid from a gas stream

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Publication number Priority date Publication date Assignee Title
FR1396819A (en) * 1964-05-28 1965-04-23 Electriciteit Mij Electrostoom Method for molding a high voltage insulator with radial protrusions, in plastic material
FR2374729A1 (en) * 1976-12-17 1978-07-13 Villamos Ipari Kutato Intezet Flexible plastics HV insulator for overhead lines - has core embedded in plastics layer with plastics screen to resist pollution and moisture

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US3534133A (en) * 1966-08-19 1970-10-13 Licentia Gmbh Method of preparing seamless non-cylindrical insulators
DE1932949A1 (en) * 1969-06-28 1971-01-07 Bbc Brown Boveri & Cie High-voltage composite insulator
US3786175A (en) * 1971-04-27 1974-01-15 Transmission Dev Ltd Electrical insulator having sheds arranged at an angle to its axis
IT1114909B (en) * 1977-07-27 1986-02-03 Fidenza Vetraria Spa ELECTRIC INSULATOR IN FIBERGLASS AND ORGANIC MATERIAL FOR HIGH VOLTAGES AND RELATED MANUFACTURING PROCEDURE

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1396819A (en) * 1964-05-28 1965-04-23 Electriciteit Mij Electrostoom Method for molding a high voltage insulator with radial protrusions, in plastic material
FR2374729A1 (en) * 1976-12-17 1978-07-13 Villamos Ipari Kutato Intezet Flexible plastics HV insulator for overhead lines - has core embedded in plastics layer with plastics screen to resist pollution and moisture

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6004416A (en) * 1996-07-31 1999-12-21 Pirelli Cavi S.P.A. Shed-formed profile insulating covering and manufacturing method thereof
US6342679B1 (en) 1996-07-31 2002-01-29 Pirelli Cavi S.P.A. Two-layered elastic tubular covering for electric components
US6576846B2 (en) 1996-07-31 2003-06-10 Pirelli Cavi S.P.A. Two-layered elastic tubular covering for electric components, in particular terminations for electric cables, and related manufacturing method and mounting

Also Published As

Publication number Publication date
JPS6359207B2 (en) 1988-11-18
US4440975A (en) 1984-04-03
FR2511180A1 (en) 1983-02-11
CA1179030A (en) 1984-12-04
FR2511180B1 (en) 1984-03-09
BR8204590A (en) 1983-07-26
ATE13103T1 (en) 1985-05-15
EP0071953B1 (en) 1985-05-02
DE3263402D1 (en) 1985-06-05
JPS5830016A (en) 1983-02-22

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