EP2023353A2 - Device for controlling a high electrical field in an insulating synthetic material, in particular for a bushing through a wall - Google Patents

Device for controlling a high electrical field in an insulating synthetic material, in particular for a bushing through a wall Download PDF

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Publication number
EP2023353A2
EP2023353A2 EP08161239A EP08161239A EP2023353A2 EP 2023353 A2 EP2023353 A2 EP 2023353A2 EP 08161239 A EP08161239 A EP 08161239A EP 08161239 A EP08161239 A EP 08161239A EP 2023353 A2 EP2023353 A2 EP 2023353A2
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EP
European Patent Office
Prior art keywords
deflector
insulating material
central conductor
annular space
insulating
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Application number
EP08161239A
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German (de)
French (fr)
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EP2023353A3 (en
Inventor
Jean-François Tortorici
Mehrdad Hassanzadeh
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Schneider Electric Energy France SAS
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Areva T&D SAS
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Publication of EP2023353A2 publication Critical patent/EP2023353A2/en
Publication of EP2023353A3 publication Critical patent/EP2023353A3/en
Withdrawn legal-status Critical Current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
    • H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
    • 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
    • H01B17/005—Insulators structurally associated with built-in electrical equipment
    • 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
    • H01B17/28—Capacitor type

Definitions

  • the invention relates to the transport of electrical energy under medium or high voltage, including sealed watertight crossings made of an insulating synthetic material, and using a deflector surrounding the electrical conductor.
  • the function of a current crossing is to perform an electric current transfer between two zones having different media, for example air, on the one hand, and a dielectric medium. It also ensures electrical isolation between the part that is under electric current, at a high voltage, and the equipment that is grounded. Finally, it makes it possible to seal between the two distinct zones and to withstand mechanical forces that can be applied to the bar constituting the conductor of the current crossing.
  • FIG. 1 represents a control device of this type, described in the French patent application FR 2,837,615 , in longitudinal section, at the end of its manufacture. It thus distinguishes a current crossing surrounded by a mass of insulating material 3 in which is embedded by one of its ends, a deflector 2.
  • the deflector 2 is connected to the earth and has the function of controlling the electric field around the conductor 1 and is extended in the air by a cylindrical portion, intended, for example, to be welded at a stitching on a metal tank of a gas-insulated medium voltage apparatus and of transfer the mechanical forces of the conductor 1 to the deflector 2 which is related to the general structure.
  • such a deflector has a shape of revolution and is made of steel, aluminum or other conductive metal material.
  • the crossing described in figure 1 , avoids some basic problems due to the implementation of the mass of insulating material 3, such as chemical shrinkage molding and molding thermal shrinkage due to the expansion coefficients of the synthetic insulating material.
  • the field deflectors can be made by flexible metal screens, in order to perfectly follow the possible expansions and withdrawals of the material. synthetic.
  • a type of deflector does not ensure the mechanical functions that a rigid baffle present.
  • the object of the invention is therefore to provide another type of sealed crossing, avoiding the aforementioned drawbacks.
  • the main object of the invention is a device for controlling a high electric field of a hermetically sealed current crossing, while transferring mechanical forces, using a mass of insulating synthetic material, molded around a central conductor. and a deflector connected to the earth and surrounding it at a non-negligible distance defined, defined in depending on the voltages applied to the current crossing.
  • the synthetic material is removed on the inside face of the metal field deflector, and an annular space without synthetic insulating material is thus provided between the deflector and the central conductor.
  • the thickness of this space is greater than or equal to 10 millimeters.
  • it is intended to keep some synthetic insulating material around the central conductor, that is to say between the latter and the annular space.
  • the annular space is preferably filled with a dielectric fluid.
  • This dielectric fluid may advantageously be sulfur hexafluoride (SF 6 ) or oil.
  • This device can be completed by the use of glass fabrics around the baffle within the insulating material located on the outer surface of the metal baffle.
  • An insulating composite material consisting of epoxy resin and glass fabric may also be used on the outer surface of the baffle.
  • the main elements to be considered in the invention are the central conductor 11, which is in fact a bar, the baffle 12 connected to the ground, the synthetic insulating material 13, which is solid.
  • the latter surrounds the central conductor 11 over a large part of it (sufficiently to be able to transfer the mechanical forces of the bar constituting the central conductor 11 to the insulating material 13) and also externally surrounds the end of the deflector 12, sufficiently to transfer the mechanical forces of the insulating material 13 to the deflector 12).
  • an annular space 14 is formed between the inner surface of the deflector 12, in particular at its end 20, so that a dielectric fluid, which is introduced into this annular space 14.
  • the annular space 14 is expected to be at least 10 mm thick. This thickness or distance separating the central conductor 11 and deflector 12 is defined according to the voltages applied to the current crossing, for example 30 millimeters for a nominal voltage of 36 kV in SF6 gas for a lightning shock peak voltage value of 170 kV.
  • the dielectric insulating fluid is preferably either oil or sulfur hexafluoride (SF 6 ).
  • SF 6 sulfur hexafluoride
  • the mass of the dielectric insulating material 13 molds only the outside of the deflector 12 by its annular portion 31 and thus provides the function of mechanical strength and sealing between the deflector 12 and itself.
  • the extension by the central portion 30 of the synthetic insulating material 13 also provides a mechanical holding function and, possibly, increases the creepage distance between the deflector 12 and the central conductor 11.
  • the central portion 31 of the synthetic insulating material 30 may have different lengths, that is to say either to extend a little more around the central conductor 11, or be shorter or nonexistent.
  • the synthetic insulating material 13 which is solid, must be impervious to the dielectric insulating medium consisting of the fluid placed in the annular space 14. Accordingly, the synthetic insulating material 13 is preferably made of resin-type polymer material thermosetting, thermoplastic or elastomer.
  • the central conductor 11 is preferably made of aluminum or copper. It is expected that the deflector 12 is made of rigid metal, for example stainless steel and, therefore, indeformable.
  • such a device is provided to hold, from the point of view of electrical insulation at the industrial frequency of 50 Hz, for example an effective voltage 70 kV.
  • a shock voltage for example a lightning shock of 170 kV at the peak.
  • a composite material 16 is formed which is in contact with the outer surface of the deflector 12, and which is embedded in the mass of the synthetic insulating material 13.
  • a glass fabric 15 the glass fabric is only a particular case of use of glass fibers
  • FIG. figure 3 Another concrete example of embodiment of the device according to the invention is shown in FIG. figure 3 . It includes the main elements represented in figure 2 , namely a deflector 22 surrounded by the annular portion 25 of the dielectric insulating material 23, which extends around the central conductor 21, the side opposite the deflector 22 and which is equipped with fins for increasing the dielectric path distance 24.
  • the dielectric isolation function obtained is very satisfactory in this device according to the invention. It is the same for the mechanical strength. Thus, the reliability of the whole is increased.
  • Such a concept of dielectric insulating material and baffle form allows to implement a fairly simple manufacturing process, including a molding in a single operation. Manufacturing costs are reduced.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)
  • Insulating Bodies (AREA)

Abstract

The device has a deflector (12), and an annular space (14) provided between the deflector and a central part (31) of a synthetic insulating material (13) surrounding a central conductor (11). A thickness of the annular space is higher than or equal to 10 millimeter, and the space is filled with a dielectric fluid i.e. sulphur hexafluoride. Reinforcement fibers (15) i.e. glass fabric, are placed around the deflector. The synthetic insulating material is thermosetting resin type polymer material, thermoplastic resin type polymer material or elastomer.

Description

Domaine de l'inventionField of the invention

L'invention concerne le transport de l'énergie électrique sous tension moyenne ou élevée, et notamment les traversées étanches de parois réalisées avec un matériau synthétique isolant, et utilisant un déflecteur entourant le conducteur électrique.The invention relates to the transport of electrical energy under medium or high voltage, including sealed watertight crossings made of an insulating synthetic material, and using a deflector surrounding the electrical conductor.

On pense plus précisément aux traversées de courant immergées d'intérieur ou d'extérieur et à isolation combinée, qui sont des traversées dont une des extrémités est destinée à être dans l'air ambiant et soumise aux conditions atmosphériques, intérieure ou extérieure, et l'autre extrémité à être en immersion dans un milieu isolant, par exemple de l'huile ou de l'hexafluorure de soufre (SF6).It is more specifically thought of the submerged current flows of indoor or outdoor and combined insulation, which are bushings whose one end is intended to be in the ambient air and subjected to atmospheric conditions, inside or outside, and other end to be immersed in an insulating medium, for example oil or sulfur hexafluoride (SF 6 ).

Une autre application possible est prévue pour les bouchons isolants ou les pièces supports isolantes.Another possible application is provided for insulating plugs or insulating support parts.

Art antérieur et problèmes posésPrior art and problems posed

Dans les appareils de transport d'électricité sous moyenne tension, il est connu de contrôler le champ électrique à l'intérieur d'un système d'isolation, par exemple d'une traversée étanche, par un déflecteur de champ électrique.In medium voltage electricity transmission apparatus, it is known to control the electric field within a system insulation, for example a watertight crossing, by an electric field deflector.

On rappelle que la fonction d'une traversée de courant est de réaliser un transfert de courant électrique entre deux zones comportant des milieux différents, par exemple de l'air, d'une part, et un milieu diélectrique. Elle permet également d'assurer l'isolement électrique entre la partie qui est sous courant électrique, à une tension élevée, et le matériel qui est mis à la terre. Enfin, elle permet d'assurer l'étanchéité entre les deux zones distinctes et de supporter des efforts mécaniques susceptibles d'être appliqués à la barre constituant le conducteur de la traversée de courant.It is recalled that the function of a current crossing is to perform an electric current transfer between two zones having different media, for example air, on the one hand, and a dielectric medium. It also ensures electrical isolation between the part that is under electric current, at a high voltage, and the equipment that is grounded. Finally, it makes it possible to seal between the two distinct zones and to withstand mechanical forces that can be applied to the bar constituting the conductor of the current crossing.

On fait donc maintenant référence à la figure 1, qui représente un dispositif de contrôle de ce type, décrit dans la demande de brevet français FR 2 837 615 , en coupe longitudinale, à la fin de sa fabrication. On y distingue donc une traversée de courant entourée d'une masse de matériau isolant 3 dans laquelle est noyé, par une de ses extrémités, un déflecteur 2. De façon classique, le déflecteur 2 est relié à la terre et a pour fonction de contrôler le champ électrique autour du conducteur 1 et se prolonge dans l'air par une partie cylindrique, destinée, par exemple, à être soudée au niveau d'un piquage sur une cuve métallique d'un appareil de moyenne tension, isolée au gaz et de transférer les efforts mécaniques du conducteur 1 vers le déflecteur 2 qui est lié à la structure générale.So we are now referring to the figure 1 , which represents a control device of this type, described in the French patent application FR 2,837,615 , in longitudinal section, at the end of its manufacture. It thus distinguishes a current crossing surrounded by a mass of insulating material 3 in which is embedded by one of its ends, a deflector 2. In a conventional manner, the deflector 2 is connected to the earth and has the function of controlling the electric field around the conductor 1 and is extended in the air by a cylindrical portion, intended, for example, to be welded at a stitching on a metal tank of a gas-insulated medium voltage apparatus and of transfer the mechanical forces of the conductor 1 to the deflector 2 which is related to the general structure.

De manière générale, un tel déflecteur a donc une forme de révolution et est en acier, en aluminium ou autre matériau métallique conducteur.In general, such a deflector has a shape of revolution and is made of steel, aluminum or other conductive metal material.

De plus, la traversée, décrite à la figure 1, permet d'éviter quelques problèmes de base dus à la mise en oeuvre de la masse de matériau isolant 3, tels que le retrait chimique de moulage et le retrait thermique de moulage dû aux coefficients de dilatation du matériau isolant synthétique.In addition, the crossing, described in figure 1 , avoids some basic problems due to the implementation of the mass of insulating material 3, such as chemical shrinkage molding and molding thermal shrinkage due to the expansion coefficients of the synthetic insulating material.

Un problème de dilatation différentielle en température, lors de l'exploitation de la traversée est également évité. En effet, on constate l'utilisation d'une couche semi-conductrice 4, qui entoure l'extrémité du déflecteur 2, le tout étant noyé dans la masse de matériau isolant synthétique 3.A problem of differential temperature expansion during operation of the crossing is also avoided. Indeed, there is the use of a semiconductor layer 4, which surrounds the end of the deflector 2, the whole being embedded in the mass of synthetic insulating material 3.

Toutefois, un tel système de traversée étanche n'est pas satisfaisant. En effet, ce dispositif est relativement complexe, puisqu'il utilise deux matériaux différents, c'est-à-dire un matériau isolant dans la masse de matériau synthétique isolant 3 et un matériau semi-conducteur dans la couche de matériau semi-conducteur 4. De plus, ce dispositif est relativement onéreux par l'utilisation de ces deux matériaux différents et du procédé de fabrication qui s'avère complexe et qui doit être effectué en deux opérations, qui sont un premier moulage pour la mise en oeuvre du matériau semi-conducteur, puis un deuxième moulage pour la mise en oeuvre du matériau isolant. Enfin, la fabrication d'un tel système n'est pas très fiable, relativement à la qualité de la traversée obtenue. En effet, le surmoulage d'un matériau conducteur ou semi-conducteur sur le matériau isolant est délicat. Il existe des risques de déchirements, d'arrachement du matériau conducteur, lors de l'injection sous pression du matériau isolant. De plus, des particules de matériau conducteur risquent d'être piégées dans la structure isolante, formée par le matériau isolant, en étant arrachées lors de l'injection.However, such a sealed crossing system is not satisfactory. Indeed, this device is relatively complex, since it uses two different materials, that is to say an insulating material in the mass of insulating synthetic material 3 and a semiconductor material in the layer of semiconductor material 4 In addition, this device is relatively expensive by the use of these two different materials and the manufacturing process which is complex and must be carried out in two operations, which are a first molding for the implementation of the semi material. -conducteur, then a second molding for the implementation of the insulating material. Finally, the manufacture of such a system is not very reliable, relative to the quality of the crossing obtained. Indeed, the overmolding of a material conductive or semiconductor on the insulating material is delicate. There are risks of tearing, tearing of the conductive material, during the injection pressure of the insulating material. In addition, particles of conductive material may be trapped in the insulating structure, formed by the insulating material, being torn off during the injection.

On note qu'il est possible, dans le cas de pièces fonctionnant à moyenne tension et étant moulées par des matériaux isolants, que les déflecteurs de champ peuvent être réalisés par des grillages métalliques souples, afin de suivre parfaitement les dilatations et retraits éventuels du matériau synthétique. Par contre, un tel type de déflecteur ne permet pas d'assurer les fonctions mécaniques qu'un déflecteur rigide présente.It is noted that it is possible, in the case of parts operating at medium voltage and being molded by insulating materials, that the field deflectors can be made by flexible metal screens, in order to perfectly follow the possible expansions and withdrawals of the material. synthetic. By cons, such a type of deflector does not ensure the mechanical functions that a rigid baffle present.

Le but de l'invention est donc de proposer un autre type de traversée étanche, évitant les inconvénients susmentionnés.The object of the invention is therefore to provide another type of sealed crossing, avoiding the aforementioned drawbacks.

Résumé de l'inventionSummary of the invention

A cet effet, l'invention a pour objet principal un dispositif pour contrôler un champ électrique élevé d'une traversée de courant hermétiquement étanche, tout en transférant des efforts mécaniques, utilisant une masse de matériau synthétique isolant, moulée autour d'un conducteur central et d'un déflecteur relié à la terre et entourant cette dernière à une distance déterminée non négligeable, définie en fonction des tensions appliquées à la traversée de courant.For this purpose, the main object of the invention is a device for controlling a high electric field of a hermetically sealed current crossing, while transferring mechanical forces, using a mass of insulating synthetic material, molded around a central conductor. and a deflector connected to the earth and surrounding it at a non-negligible distance defined, defined in depending on the voltages applied to the current crossing.

Selon l'invention, on supprime le matériau synthétique sur la face intérieure du déflecteur de champ métallique, et on ménage ainsi un espace annulaire sans matériau synthétique isolant entre le déflecteur et le conducteur central.According to the invention, the synthetic material is removed on the inside face of the metal field deflector, and an annular space without synthetic insulating material is thus provided between the deflector and the central conductor.

De préférence, l'épaisseur de cet espace est supérieur ou égale à 10 millimètres.Preferably, the thickness of this space is greater than or equal to 10 millimeters.

Dans une des réalisations, il est prévu de conserver un peu de matériau isolant synthétique autour du conducteur central, c'est-à-dire entre ce dernier et l'espace annulaire.In one embodiment, it is intended to keep some synthetic insulating material around the central conductor, that is to say between the latter and the annular space.

Pour obtenir une efficacité totale, l'espace annulaire est de préférence remplie d'un fluide diélectrique.To achieve total efficiency, the annular space is preferably filled with a dielectric fluid.

Ce fluide diélectrique peut être avantageusement de l'hexafluorure de soufre (SF6) ou de l'huile.This dielectric fluid may advantageously be sulfur hexafluoride (SF 6 ) or oil.

On peut compléter ce dispositif par l'utilisation de tissus de verre autour du déflecteur au sein du matériau isolant situé sur la surface externe du déflecteur métallique.This device can be completed by the use of glass fabrics around the baffle within the insulating material located on the outer surface of the metal baffle.

On peut également utiliser un matériau composite isolant constitué de résine époxy et de tissu de verre sur la surface externe du déflecteur.An insulating composite material consisting of epoxy resin and glass fabric may also be used on the outer surface of the baffle.

Liste des figuresList of Figures

L'invention et ses différentes caractéristiques techniques seront mieux comprises à la lecture de la description suivante, accompagnée de trois figures représentant respectivement :

  • figure 1, en coupe, un dispositif de traversée selon l'art antérieur ;
  • figure 2, en coupe, un détail d'une réalisation préférentielle selon l'invention ; et
  • figure 3, en coupe, une réalisation complète de l'invention.
The invention and its various technical features will be better understood in the reading of the following description, accompanied by three figures respectively representing:
  • figure 1 , in section, a traversing device according to the prior art;
  • figure 2 , in section, a detail of a preferred embodiment according to the invention; and
  • figure 3 , in section, a complete embodiment of the invention.

Description détaillée d'une réalisation de l'inventionDetailed description of an embodiment of the invention

En référence à la figure 2, les principaux éléments à prendre en compte dans l'invention sont le conducteur central 11, qui est en fait une barre, le déflecteur 12 relié à la terre, le matériau isolant synthétique 13, qui est solide. Ce dernier entoure le conducteur central 11 sur une grande partie de celui-ci (suffisamment pour pouvoir transférer les efforts mécanique de la barre constituant le conducteur central 11 au matériau isolant 13) et entoure extérieurement également l'extrémité du déflecteur 12, suffisamment pour transférer les efforts mécaniques du matériau isolant 13 au déflecteur 12). Toutefois, un espace annulaire 14 est ménagé entre la surface intérieure du déflecteur 12, notamment au niveau de son extrémité 20, de manière à ce qu'un fluide diélectrique, qui est introduit dans cet espace annulaire 14.With reference to the figure 2 , the main elements to be considered in the invention are the central conductor 11, which is in fact a bar, the baffle 12 connected to the ground, the synthetic insulating material 13, which is solid. The latter surrounds the central conductor 11 over a large part of it (sufficiently to be able to transfer the mechanical forces of the bar constituting the central conductor 11 to the insulating material 13) and also externally surrounds the end of the deflector 12, sufficiently to transfer the mechanical forces of the insulating material 13 to the deflector 12). However, an annular space 14 is formed between the inner surface of the deflector 12, in particular at its end 20, so that a dielectric fluid, which is introduced into this annular space 14.

On prévoit que l'espace annulaire 14 soit d'une épaisseur au moins supérieure à 10_ millimètres. Cette épaisseur ou distance séparant le conducteur central 11 et le déflecteur 12 est définie en fonction des tensions appliquées à la traversée de courant, par exemple 30 millimètres pour une tension nominale de 36 kV dans du gaz SF6 pour une valeur de tension de crête de choc de foudre de 170 kV.The annular space 14 is expected to be at least 10 mm thick. This thickness or distance separating the central conductor 11 and deflector 12 is defined according to the voltages applied to the current crossing, for example 30 millimeters for a nominal voltage of 36 kV in SF6 gas for a lightning shock peak voltage value of 170 kV.

Le fluide isolant diélectrique est, de préférence, soit de l'huile, soit de l'hexafluorure de soufre (SF6). Ainsi, la masse du matériau isolant diélectrique 13 ne surmoule que l'extérieur du déflecteur 12 par sa partie annulaire 31 et assure donc la fonction de tenue mécanique et étanchéité entre le déflecteur 12 et lui-même. Dans le cas du conducteur central 11, le prolongement par la partie centrale 30 du matériau isolant synthétique 13 assure également une fonction de tenue mécanique et, éventuellement, permet d'augmenter la ligne de fuite entre le déflecteur 12 et le conducteur central 11. On peut imaginer que la partie centrale 31 du matériau isolant synthétique 30 puisse avoir différentes longueurs, c'est-à-dire soit se prolonger un peu plus autour du conducteur central 11, soit être plus courte, soit inexistante.The dielectric insulating fluid is preferably either oil or sulfur hexafluoride (SF 6 ). Thus, the mass of the dielectric insulating material 13 molds only the outside of the deflector 12 by its annular portion 31 and thus provides the function of mechanical strength and sealing between the deflector 12 and itself. In the case of the central conductor 11, the extension by the central portion 30 of the synthetic insulating material 13 also provides a mechanical holding function and, possibly, increases the creepage distance between the deflector 12 and the central conductor 11. can imagine that the central portion 31 of the synthetic insulating material 30 may have different lengths, that is to say either to extend a little more around the central conductor 11, or be shorter or nonexistent.

On note que le matériau isolant synthétique 13, qui est solide, doit être étanche au milieu isolant diélectrique constitué par le fluide mis dans l'espace annulaire 14. En conséquence, le matériau isolant synthétique 13 est, de préférence, en matériau polymère type résine thermodurcissable, thermoplastique ou élastomère. Le conducteur central 11 est, de préférence, en aluminium ou en cuivre. Il est prévu que le déflecteur 12 soit en métallique rigide, par exemple en acier inoxydable et, donc, indéformable.It is noted that the synthetic insulating material 13, which is solid, must be impervious to the dielectric insulating medium consisting of the fluid placed in the annular space 14. Accordingly, the synthetic insulating material 13 is preferably made of resin-type polymer material thermosetting, thermoplastic or elastomer. The central conductor 11 is preferably made of aluminum or copper. It is expected that the deflector 12 is made of rigid metal, for example stainless steel and, therefore, indeformable.

Enfin, il est prévu que, lors de l'utilisation de l'hexafluorure de soufre (SF6), celui-ci soit maintenu dans l'espace annulaire 14, par exemple sous une pression de 1,5 bars absolus mesurés à la température ambiante.Finally, it is envisaged that, when sulfur hexafluoride (SF 6 ) is used, it is maintained in the annular space 14, for example at a pressure of 1.5 bar absolute measured at the temperature room.

Ainsi, un tel dispositif est prévu pour tenir, du point de vue de l'isolation électrique à la fréquence industrielle de 50 Hz, par exemple une tension 70 kV efficace. De plus, il est capable de supporter une tension de choc, par exemple un choc de foudre de 170 kV à la crête. On ajoute que, les risques de fissurations du matériau isolant synthétique 13 sur la surface extérieure du déflecteur 12 rigide, se trouvant en traction à cause du phénomène de dilatation différentielle entre température de moulage et d'utilisation, peuvent être supprimés par l'ajout de fibres de renforcement, par exemple de verre, autour du déflecteur 12, lors du moulage (les fibres de verre s'imprègnent de l'époxy de moulage). Ainsi, on forme un matériau composite 16 qui est en contact de la surface externe du déflecteur 12, et qui est noyé dans la masse du matériau isolant synthétique 13. Enfin, on note que l'utilisation d'un tissu de verre 15 (le tissu de verre n'est qu'un cas particulier d'utilisation de fibres de verre) peut également améliorer les performances mécaniques du matériau isolant diélectrique 13 à ce même endroit.Thus, such a device is provided to hold, from the point of view of electrical insulation at the industrial frequency of 50 Hz, for example an effective voltage 70 kV. In addition, it is able to withstand a shock voltage, for example a lightning shock of 170 kV at the peak. It is added that, the risks of cracking of the synthetic insulating material 13 on the outer surface of the rigid deflector 12, being in tension due to the phenomenon of differential expansion between molding temperature and use, can be eliminated by the addition of reinforcing fibers, for example glass, around the deflector 12, during molding (the glass fibers are impregnated with the molding epoxy). Thus, a composite material 16 is formed which is in contact with the outer surface of the deflector 12, and which is embedded in the mass of the synthetic insulating material 13. Finally, it is noted that the use of a glass fabric 15 (the glass fabric is only a particular case of use of glass fibers) can also improve the mechanical performance of the dielectric insulating material 13 at this same location.

Un autre exemple concret de réalisation du dispositif selon l'invention est représenté à la figure 3. Il reprend les éléments principaux représentés à la figure 2, à savoir un déflecteur 22 entouré de la partie annulaire 25 du matériau isolant diélectrique 23, qui se prolonge autour du conducteur central 21, du côté opposé au déflecteur 22 et qui est équipé d'ailettes d'accroissement de la distance de cheminement diélectrique 24.Another concrete example of embodiment of the device according to the invention is shown in FIG. figure 3 . It includes the main elements represented in figure 2 , namely a deflector 22 surrounded by the annular portion 25 of the dielectric insulating material 23, which extends around the central conductor 21, the side opposite the deflector 22 and which is equipped with fins for increasing the dielectric path distance 24.

Avantages de l'inventionAdvantages of the invention

La fonction d'isolation diélectrique obtenue est très satisfaisante dans ce dispositif selon l'invention. Il en est de même pour la tenue mécanique. Ainsi, la fiabilité de l'ensemble est accrue. Un tel concept de forme de matériau isolant diélectrique et de déflecteur permet de mettre en oeuvre un procédé de fabrication assez simple, notamment un moulage en une seule opération. Les coûts de fabrication s'en trouvent réduits.The dielectric isolation function obtained is very satisfactory in this device according to the invention. It is the same for the mechanical strength. Thus, the reliability of the whole is increased. Such a concept of dielectric insulating material and baffle form allows to implement a fairly simple manufacturing process, including a molding in a single operation. Manufacturing costs are reduced.

Claims (6)

Dispositif pour contrôler un champ électrique élevé d'une traversée de courant hermétiquement étanche d'un conducteur central (11, 21) noyée dans un matériau synthétique isolant (13, 23) moulé autour du conducteur central (11, 21) et d'un déflecteur (12, 22) reliée à la terre, ce dernier entourant le conducteur central (11, 21), à une distance déterminée non négligeable,
caractérisé en ce qu'un espace annulaire (14) est prévu entre le déflecteur (12) et une partie centrale (31) du matériau isolant synthétique (13) entourant le conducteur central (11, 21).Device for controlling a high electric field of a hermetically sealed current through of a central conductor (11, 21) embedded in an insulating synthetic material (13, 23) molded around the central conductor (11, 21) and a baffle (12, 22) connected to earth, the latter surrounding the central conductor (11, 21), at a non-negligible distance,
characterized in that an annular space (14) is provided between the baffle (12) and a central portion (31) of the synthetic insulating material (13) surrounding the central conductor (11, 21). Système selon la revendication 1, caractérisée en ce que l'épaisseur de l'espace annulaire (14) est supérieure ou égale à 10 millimètres.System according to claim 1, characterized in that the thickness of the annular space (14) is greater than or equal to 10 millimeters. Système selon la revendication 1, caractérisé en ce que l'espace annulaire (14) est rempli d'un fluide diélectrique.System according to claim 1, characterized in that the annular space (14) is filled with a dielectric fluid. Dispositif selon la revendication 3, caractérisé en ce que le fluide diélectrique est de l'hexafluorure de soufre (SF6).Device according to claim 3, characterized in that the dielectric fluid is sulfur hexafluoride (SF 6 ). Dispositif selon la revendication 1, caractérisé en ce qu'il comprend des fibres de renforcement (15) placées autour du déflecteur (12).Device according to claim 1, characterized in that it comprises reinforcing fibers (15) placed around the deflector (12). Dispositif selon la revendication 1, caractérisé en ce qu'il comprend un matériau composite isolant (16) composé d'un polymère et de fibres de renforcement sur la surface externe du déflecteur (12).Device according to claim 1, characterized in that it comprises an insulating composite material (16) composed of a polymer and reinforcing fibers on the outer surface of the deflector (12).
EP08161239A 2007-08-07 2008-07-28 Device for controlling a high electrical field in an insulating synthetic material, in particular for a bushing through a wall Withdrawn EP2023353A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0756986A FR2919955B1 (en) 2007-08-07 2007-08-07 DEVICE FOR CONTROLLING A HIGH ELECTRIC FIELD IN AN INSULATING SYNTHETIC MATERIAL, IN PARTICULAR FOR A CURRENT THROUGH A WALL THROUGH A WALL

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EP2023353A2 true EP2023353A2 (en) 2009-02-11
EP2023353A3 EP2023353A3 (en) 2009-12-09

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EP2500914B1 (en) * 2011-03-16 2014-03-05 ABB Technology Ltd High voltage bushing with support for the conductor
CN104167334B (en) * 2014-09-01 2017-04-05 江苏神马电力股份有限公司 Guide and the insulator with control stick

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CN101436453A (en) 2009-05-20
CN101436453B (en) 2012-06-13
RU2488183C2 (en) 2013-07-20
FR2919955A1 (en) 2009-02-13
FR2919955B1 (en) 2009-10-30
EP2023353A3 (en) 2009-12-09

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