EP1045404B1 - Insulated feed-through for medium or high voltage electrical apparatus, especially for transformer, and its method of manufacturing - Google Patents

Insulated feed-through for medium or high voltage electrical apparatus, especially for transformer, and its method of manufacturing Download PDF

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Publication number
EP1045404B1
EP1045404B1 EP00400951A EP00400951A EP1045404B1 EP 1045404 B1 EP1045404 B1 EP 1045404B1 EP 00400951 A EP00400951 A EP 00400951A EP 00400951 A EP00400951 A EP 00400951A EP 1045404 B1 EP1045404 B1 EP 1045404B1
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EP
European Patent Office
Prior art keywords
tube
connecting piece
cavity
metallic
feed
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.)
Expired - Lifetime
Application number
EP00400951A
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German (de)
French (fr)
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EP1045404A1 (en
Inventor
Laurent Gaillard
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Manufacture dAppareillage Electrique de Cahors SA
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Manufacture dAppareillage Electrique de Cahors SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • 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
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/30—Sealing

Definitions

  • the EPDM elastomer coating is produced by injection. Injection pressure and temperature are such (around 500 bars at 170 ° C) that it is practically impossible to guarantee that the bonding of the attachment piece will not be degraded during this product manufacturing stage, due to the deformation of materials and coefficients of different dilation of these.
  • the adhesive material filling the cavity ensures thus excellent fixing by gluing the end piece metallic.
  • the inner surface of the metal end piece 2 has a annular cavity 5 open to the surface 1a of the tube 1 and spanning most of the length of the end piece 2.
  • This annular cavity 5 communicates with the outside by a channel 6 and is filled by a adhesive material 7 for example an injected epoxy resin into cavity 5 through channel 6.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Insulating Of Coils (AREA)

Abstract

The cross isolation section has an isolation material tube (1) and having a metallic end (2) at one end and a second metalli element (3) connected to an outer electrical conductor. There is an elastomer cover (4). The inner surface of the metallic end h an annular cavity (5) which is inside a channel (6) and filled with an adhesive material injected in the channel.

Description

La présente invention concerne une traversée ou colonne isolante pour appareil électrique moyenne ou haute tension, en particulier pour des transformateurs moyenne tension, et sur procédé de fabrication d'une telle traversée.The present invention relates to a crossing or insulating column for medium electrical appliance or high voltage, especially for transformers medium voltage, and on the method of manufacturing such a crossing.

De telles traversées isolantes comprennent, de façon connue, un tube en matière isolante telle qu'une résine époxy chargée de fibres de verre, destiné à entourer un conducteur électrique.Such insulating bushings include, in known manner, a tube of insulating material such as a epoxy resin filled with glass fibers, intended for surround an electrical conductor.

L'une des extrémités du tube est entourée par un embout métallique, par exemple en aluminium, destiné à être fixé à l'appareil électrique.One end of the tube is surrounded by a metal tip, for example aluminum, intended for be attached to the electrical appliance.

L'autre extrémité du tube porte un élément métallique généralement en aluminium en forme de couronne, destiné à être connecté avec un conducteur électrique extérieur.The other end of the tube carries an element metallic generally aluminum shaped crown, intended to be connected with a conductor electric outdoor.

La surface extérieure du tube comprise entre l'embout métallique et l'élément métallique est recouverte par un revêtement en élastomère, par exemple en EPDM qui protège le tube des contraintes liées à l'environnement et garantit une distance de cheminement suffisante pour assurer l'isolation électrique souhaitée.The outer surface of the tube between the metal tip and the metal element is covered by an elastomer coating, for example made of EPDM which protects the tube from stresses linked to the environment and guarantees a path distance sufficient to provide electrical insulation desired.

Les liaisons entre le tube isolant, l'élément et l'embout métalliques sont réalisées par collage. Toutes autres méthodes d'assemblage sont difficilement pensables car on ne peut accepter aucune déformation du tube ou des pièces métalliques ci-dessus, ni présence de rivets ou d'autres systèmes mécaniques compte tenu de l'intensité du champ électrique dans cet espace très restreint entre l'embout de fixation et le conducteur sous tension traversant la traversée. The connections between the insulating tube, the element and the metal end caps are made by gluing. All other assembly methods are hardly thinkable because we cannot accept any deformation of the tube or metal parts above, or presence of rivets or other mechanical systems given the intensity of the electric field in this very space restricted between the fixing end piece and the conductor under tension crossing the crossing.

Le revêtement en élastomère EPDM est réalisé par injection. La pression et la température d'injection sont telles (de l'ordre de 500 bars à 170°C) qu'il est pratiquement impossible de garantir que le collage de l'embout de fixation ne sera pas dégradé pendant cette étape de la fabrication du produit, en raison de la déformation des matériaux et des coefficients de dilatation différents de ceux-ci.The EPDM elastomer coating is produced by injection. Injection pressure and temperature are such (around 500 bars at 170 ° C) that it is practically impossible to guarantee that the bonding of the attachment piece will not be degraded during this product manufacturing stage, due to the deformation of materials and coefficients of different dilation of these.

Le but de la présente invention est de créer une traversée isolante du type ci-dessus dans laquelle le collage de l'embout de fixation au tube est assuré dans des conditions optimales.The purpose of the present invention is to create a insulating bushing of the above type in which the bonding of the attachment piece to the tube is ensured in optimal conditions.

Suivant l'invention, cette traversée isolante est caractérisée en ce que la surface intérieure de l'embout métallique comporte une cavité annulaire ouverte vers la surface du tube et s'étendant sur la majeure partie de la longueur de l'embout, cette cavité annulaire communiquant avec l'extérieur par un canal et étant remplie par une matière adhésive injectée dans la cavité par ledit canal.According to the invention, this insulating crossing is characterized in that the inner surface of the metal tip has an annular cavity open towards the surface of the tube and extending over the most of the length of the tip, this cavity annular communicating with the outside by a channel and being filled with an adhesive material injected into the cavity through said channel.

La matière adhésive remplissant la cavité assure ainsi une excellente fixation par collage de l'embout métallique.The adhesive material filling the cavity ensures thus excellent fixing by gluing the end piece metallic.

Etant donné que le collage est limité à la zone de la cavité, ce collage peut être effectué après l'application du revêtement en élastomère, sans risque de présence d'élastomère dans la zone de collage.Since bonding is limited to the area of the cavity, this bonding can be carried out after risk-free application of elastomer coating presence of elastomer in the bonding area.

Selon une version préférée de l'invention, la cavité est limitée de chaque côté par une protubérance annulaire en contact avec la surface extérieure du tube.According to a preferred version of the invention, the cavity is limited on each side by a protuberance annular in contact with the outer surface of the tube.

Ces deux protubérances limitent la zone de collage et assurent un excellent centrage de l'embout métallique sur l'extrémité du tube.These two protrusions limit the area of bonding and ensure excellent centering of the tip metal on the end of the tube.

De préférence également, la protubérance adjacente au revêtement en élastomère présente une gorge dans laquelle est logé un joint d'étanchéité en contact avec la surface du tube.Also preferably, the protuberance adjacent to the elastomer coating has a groove in which is housed a contact seal with the surface of the tube.

Ce joint forme une barrière étanche qui évite tout risque de pénétration d'élastomère dans la zone de collage de l'embout au tube.This seal forms a tight barrier which prevents any risk of elastomer penetration into the bonding of the nozzle to the tube.

Le procédé de fabrication de la traversée isolante conforme à l'invention, comprend les étapes suivantes :

  • on fixe par collage ledit élément métallique à l'une des extrémités du tube en matière isolante ;
  • on engage l'embout métallique sur l'autre extrémité du tube ;
  • on place le joint d'étanchéité dans la gorge de cet embout ;
  • on réalise par surmoulage le revêtement en élastomère sur la surface du tube comprise entre l'élément métallique et le joint d'étanchéité ;
  • on injecte la matière adhésive dans le canal de l'embout métallique pour remplir la cavité de cet embout et coller celui-ci à la surface du tube.
The process for manufacturing the insulating bushing according to the invention comprises the following steps:
  • said metal element is fixed by gluing to one end of the tube of insulating material;
  • engaging the metal tip on the other end of the tube;
  • the seal is placed in the groove of this nozzle;
  • the elastomer coating is produced by overmolding on the surface of the tube between the metal element and the seal;
  • the adhesive material is injected into the channel of the metal endpiece to fill the cavity of this endpiece and stick it to the surface of the tube.

D'autres particularités et avantages de l'invention apparaítront encore dans le description ci-après.Other features and advantages of the invention will appear further in the description below.

Aux dessins annexés donnés à titre d'exemples non limitatifs :

  • la figure 1 est une vue en élévation et en coupe partielle d'une traversée isolante conforme à l'invention ;
  • la figure 2 est une vue de dessus de la traversée selon la figure 1 ;
  • la figure 3 est une vue en coupe à échelle agrandie d'un détail de la partie inférieure de la traversée.
In the appended drawings given by way of nonlimiting examples:
  • Figure 1 is an elevational view in partial section of an insulating bushing according to the invention;
  • Figure 2 is a top view of the bushing according to Figure 1;
  • Figure 3 is an enlarged sectional view of a detail of the lower part of the crossing.

Dans la réalisation des figures 1 et 2, la traversée isolante pour appareil électrique moyenne ou haute tension, en particulier pour transformateur, comprend un tube 1 en matière isolante par exemple en résine époxy chargée de fibres, et destiné à entourer un conducteur électrique.In the embodiment of Figures 1 and 2, the insulating bushing for medium electrical appliance or high voltage, in particular for transformer, comprises a tube 1 made of insulating material, for example epoxy resin loaded with fibers, and intended to surround a electrical conductor.

L'une des extrémités du tube est entourée par un embout métallique 2 par exemple en aluminium destiné à être fixé à l'appareil électrique, par exemple sur le couvercle d'un transformateur.One end of the tube is surrounded by a metal tip 2 for example aluminum intended for be attached to the electrical appliance, for example on the cover of a transformer.

L'autre extrémité du tube 1 porte un élément métallique 3 par exemple en aluminium destiné à être connecté avec un conducteur électrique extérieur.The other end of the tube 1 carries an element metallic 3 for example aluminum intended to be connected with an external electrical conductor.

La surface extérieure la du tube 1 comprise entre l'embout métallique 2 et l'élément métallique 3 est recouverte par un revêtement 4 en élastomère par exemple en EPDM.The outer surface 1a of the tube 1 included between the metal end piece 2 and the metal element 3 is covered by an elastomer coating 4 by example in EPDM.

On voit plus en détail sur la figure 3 que la surface intérieure de l'embout métallique 2 comporte une cavité annulaire 5 ouverte vers la surface la du tube 1 et s'étendant sur la majeure partie de la longueur de l'embout 2. Cette cavité annulaire 5 communique avec l'extérieur par un canal 6 et est remplie par une matière adhésive 7 par exemple une résine époxy injectée dans la cavité 5 par le canal 6.We see in more detail in Figure 3 that the inner surface of the metal end piece 2 has a annular cavity 5 open to the surface 1a of the tube 1 and spanning most of the length of the end piece 2. This annular cavity 5 communicates with the outside by a channel 6 and is filled by a adhesive material 7 for example an injected epoxy resin into cavity 5 through channel 6.

On voit également sur la figure 3 que la cavité 5 est limitée de chaque côté par une protubérance annulaire 8, 9 en contact avec la surface extérieure la du tube 1. Ces protubérances 8, 9 permettent de centrer l'embout 2 par rapport au tube 1.We also see in Figure 3 that the cavity 5 is limited on each side by a protuberance annular 8, 9 in contact with the outer surface la of the tube 1. These protrusions 8, 9 make it possible to center the end piece 2 relative to the tube 1.

Par ailleurs, la protubérance 9 adjacente au revêtement 4 en élastomère présente une gorge 10 dans laquelle est logé un joint torique d'étanchéité 11 en contact avec la surface la du tube 1.Furthermore, the protuberance 9 adjacent to the elastomeric coating 4 has a groove 10 in which is housed an O-ring seal 11 in contact with the surface 1a of the tube 1.

La figure 3 montre d'autre part que la gorge 10 est ouverte vers le revêtement 4 en élastomère et le joint 11 est en contact avec l'élastomère.Figure 3 shows on the other hand that the groove 10 is open towards the elastomer coating 4 and the seal 11 is in contact with the elastomer.

La profondeur d de la cavité 5 (voir figure 3) est comprise entre 0,2 et 0,5 mm. The depth d of the cavity 5 (see FIG. 3) is between 0.2 and 0.5 mm.

Le procédé pour fabriquer la traversée isolante décrite ci-dessus comprend les étapes suivantes :

  • on fixe par collage l'élément métallique 3 à l'une des extrémités du tube 1 en matière isolante ;
  • on engage l'embout métallique 2 sur l'autre extrémité du tube 1 ;
  • on place le joint d'étanchéité 11 dans la gorge 10 de cet embout ;
  • on réalise par surmoulage le revêtement en élastomère 4 sur la surface la du tube 1 comprise entre l'élément métallique 3 et le joint d'étanchéité 11 ;
  • on injecte la matière adhésive 7 dans le canal 6 de l'embout métallique 2 pour remplir la cavité 5 de cet embout 2 et coller celui-ci à la surface la du tube 1.
The process for manufacturing the insulating bushing described above comprises the following steps:
  • the metal element 3 is fixed by gluing to one end of the tube 1 made of insulating material;
  • engaging the metal tip 2 on the other end of the tube 1;
  • the seal 11 is placed in the groove 10 of this nozzle;
  • the elastomer coating 4 is produced by overmolding on the surface of the tube 1 between the metal element 3 and the seal 11;
  • the adhesive material 7 is injected into the channel 6 of the metal end piece 2 to fill the cavity 5 of this end piece 2 and adhere it to the surface 1a of the tube 1.

Cette façon de procéder permet d'éviter tout risque de pénétration de l'élastomère du revêtement 4 dans la zone de collage de l'embout 2.This procedure avoids any risk of penetration of the coating elastomer 4 in the bonding area of the nozzle 2.

Grâce au procédé selon l'invention, l'embout 2 est parfaitement collé à la surface du tube 1, sans risque de déformation du tube 1 et de l'embout 2 et sans avoir à utiliser des vis ou des rivets qui compromettraient gravement l'isolation électrique.Thanks to the method according to the invention, the nozzle 2 is perfectly bonded to the surface of tube 1, without risk of deformation of the tube 1 and of the nozzle 2 and without have to use screws or rivets that would seriously compromise electrical insulation.

La fixation de la traversée sur l'appareil électrique est réalisée grâce aux trous 12 (voir figure 2) prévus sur la collerette 2a de l'embout 2.Fixing the bushing on the device electric is carried out thanks to the holes 12 (see figure 2) provided on the flange 2a of the nozzle 2.

Claims (5)

  1. Insulating feed-through for medium- or high-voltage electrical apparatus, in particular for a transformer, comprising a tube (1) made from insulating material intended to surround an electrical conductor, one of the ends of the tube being surrounded by a metallic connecting piece (2) intended to be fixed to the electrical apparatus, the other end of the tube (1) carrying a metallic element (3) intended to be connected with an external electrical conductor, the external surface (1a) of the tube (1) included between the metallic connecting piece (2) and the metallic element (3) being covered with an elastomer cladding (4), characterised in that the internal surface of the metallic connecting piece (2) comprises an annular cavity (5) open towards the surface (1a) of the tube (1) and extending over the major part of the length of the connecting piece (2), this annular cavity (5) communicating with the outside through a channel (6) and being filled with an adhesive material (7) injected into the cavity (5) through the said channel (4).
  2. Feed-through according to Claim 1, characterised in that the cavity (5) is delimited on each side by an annular protuberance (8, 9) in contact with the external surface (1a) of the tube (1).
  3. Feed-through according to Claim 2, characterised in that the protuberance (9) adjacent to the elastomer cladding (4) has a groove (10) in which there is housed a seal (11) in contact with the surface (1a) of the tube (1).
  4. Feed-through according to Claim 3, characterised in that the said groove (10) is open towards the elastomer cladding (4) and the seal (11) is in contact with the elastomer (4).
  5. Method of manufacturing the insulating feed-through according to one of Claims 3 or 4, characterised in that it comprises the following steps:
    the said metallic element (3) is fixed by adhesive bonding to one of the ends of the tube (1) made from insulating material;
    the metallic connecting piece (2) is engaged on the other end of the tube (1);
    the seal (11) is placed in the groove (10) in this connecting piece (2);
    the elastomer cladding (4) is produced by overmoulding on the surface (1a) of the tube (1) lying between the metallic element (3) and the seal (11);
    the adhesive material (7) is injected into the channel (6) of the metallic connecting piece (2) in order to fill the cavity (5) in this connecting piece and bond the latter to the surface of the tube (1).
EP00400951A 1999-04-12 2000-04-06 Insulated feed-through for medium or high voltage electrical apparatus, especially for transformer, and its method of manufacturing Expired - Lifetime EP1045404B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9904533 1999-04-12
FR9904533A FR2792106B1 (en) 1999-04-12 1999-04-12 INSULATING CROSSING FOR MEDIUM OR HIGH VOLTAGE ELECTRICAL APPLIANCES, IN PARTICULAR FOR TRANSFORMERS

Publications (2)

Publication Number Publication Date
EP1045404A1 EP1045404A1 (en) 2000-10-18
EP1045404B1 true EP1045404B1 (en) 2004-09-15

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ID=9544280

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00400951A Expired - Lifetime EP1045404B1 (en) 1999-04-12 2000-04-06 Insulated feed-through for medium or high voltage electrical apparatus, especially for transformer, and its method of manufacturing

Country Status (4)

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EP (1) EP1045404B1 (en)
AT (1) ATE276576T1 (en)
DE (1) DE60013676D1 (en)
FR (1) FR2792106B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2855314B1 (en) * 2003-05-22 2005-07-08 Maclean Power France METHOD FOR MANUFACTURING A COMPOSITE ISOLATOR

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2726395B1 (en) * 1994-10-28 1997-01-10 Sediver METHOD OF ASSEMBLING A LAMINATED SUPPORT AND A HINGE FOR THE MANUFACTURE OF AN ELECTRICAL INSULATOR
JP3415351B2 (en) * 1995-11-30 2003-06-09 日本碍子株式会社 Press-fit joining method between core tube and flange fitting of composite steel pipe

Also Published As

Publication number Publication date
DE60013676D1 (en) 2004-10-21
FR2792106B1 (en) 2001-05-11
FR2792106A1 (en) 2000-10-13
EP1045404A1 (en) 2000-10-18
ATE276576T1 (en) 2004-10-15

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