EP3486934A1 - Cutoff pole for electrical switchgear - Google Patents

Cutoff pole for electrical switchgear Download PDF

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Publication number
EP3486934A1
EP3486934A1 EP18201680.8A EP18201680A EP3486934A1 EP 3486934 A1 EP3486934 A1 EP 3486934A1 EP 18201680 A EP18201680 A EP 18201680A EP 3486934 A1 EP3486934 A1 EP 3486934A1
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EP
European Patent Office
Prior art keywords
cylindrical body
connector
vacuum
bulb
seal
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Withdrawn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
EP18201680.8A
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German (de)
French (fr)
Inventor
Jean-Michel Bonfils
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric Industries SAS
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Filing date
Publication date
Application filed by Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP3486934A1 publication Critical patent/EP3486934A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • H01H2033/6623—Details relating to the encasing or the outside layers of the vacuum switch housings

Definitions

  • the present invention relates to a breaking pole for a high-voltage electrical switchgear, that is to say a device operating at a voltage greater than 1000V, this pole comprising a vacuum interrupter intended to cut a circuit electric.
  • the invention also relates to an electrical switching device comprising such a pole for at least one of its phases.
  • electrical switching device includes different types of electrical devices such as a switch, a circuit breaker, a contactor, a fuse switch, a disconnector, a recloser, etc.
  • a vacuum interrupter is a cutoff device which comprises a generally substantially cylindrical body containing a sealed chamber in which there are present two electrical contacts, one of which is movable so as to open and close an electrical circuit passing through these contacts.
  • the vacuum bulb is intended to be integrated inside an envelope (or shell) of a breaking pole of an electrical breaking device.
  • the two electrical contacts each located at one end of the bulb are electrically connected to respectively two electrical connectors of the pole, named for example high connector and low connector. These two connectors are fixed and one of the two connectors is connected to the movable contact by a flexible or slippery conductor.
  • a vacuum interrupter must withstand significant dielectric stresses. Indeed, when the contacts of the vacuum bulb are open, there is a strong potential difference between the top and bottom connectors of the pole and therefore a significant risk of occurrence of an electric arc between them passing around the bulb. Also, to improve the electrical insulation around the bulb and particularly avoid the appearance of insulation problems between the top and bottom connectors of the same pole or between two adjacent poles of the same device, it is already known to completely overmold the cylindrical body of the ampoule with a layer usually made of epoxy material, as described in FIG. document EP2835812A1 . This avoids in particular that there is air between the outer walls of the body of the bulb and the envelope of the pole.
  • Another solution would be to not use ambient air but an insulating gas such as SF6 around the vacuum bulb to improve the dielectric performance. Nevertheless, it is necessary then to use a more complex shell because waterproof and equipped with bushings for current conductors. In addition, this solution is very unfavorable for the environment, with respect to pollution and the greenhouse effect, and complicates recycling.
  • the invention therefore aims to design a simple system, economical to avoid the dielectric stress around the vacuum bulb, and not having the various disadvantages mentioned above.
  • a breaking pole comprising an insulating envelope, a high connector and a low connector and a vacuum interrupter which is placed in the insulating envelope between the top connector and the bottom connector, the vacuum interrupter comprising a cylindrical body along a longitudinal axis and a transverse upper part, the cylindrical body housing a fixed contact and a movable contact electrically connected respectively with the top connector and the bottom connector.
  • the vacuum interrupter has a seal placed on the top and which is compressed against the envelope when the vacuum interrupter is attached to the top connector, so as to isolate the top connector and the fixed contact of the air located between the casing and the cylindrical body of the vacuum bottle and the seal corresponds to an end of an insulating sleeve surrounding the cylindrical body of the vacuum bulb.
  • the vacuum bottle comprises a top cover and a bottom cover closing the two ends of the cylindrical body, the upper part of the vacuum bottle being a flat part belonging to the cover.
  • the insulating sleeve is made of elastomeric material.
  • the seal is compressed against a transverse advance of the insulating envelope, which transverse advance is substantially parallel to the upper part, so as to compress the seal against two surfaces substantially perpendicular to the longitudinal axis.
  • the insulating sleeve comprises an inner wall which is covered with a conductive or semi-conductive paint applied in the vicinity of a junction between the top cover and the cylindrical body and in the vicinity of a junction between the bottom cover and the cylindrical body.
  • the insulating sleeve comprises a semiconductor screen which is overmolded inside the sleeve in the vicinity of a junction between the top cover and the cylindrical body and in the vicinity of a junction between the bottom cover and the cylindrical body.
  • the vacuum bulb is fixed to the top connector by means of a fixing screw.
  • the invention also relates to an electrical cutting apparatus comprising such a breaking pole for at least one of its phases.
  • a vacuum interrupter 10 has a substantially cylindrical body containing a sealed break chamber 13 in which the vacuum prevails, that is to say a very low controlled pressure of air or another gas.
  • the body of the bulb 10 is formed by a wall 15 of cylindrical shape along a longitudinal axis X and which is closed at both ends by two metal covers, referred to herein as the top cover 16 and the bottom cover 17.
  • the cylindrical wall 15 is made of a dielectric material, preferably ceramic, and the two metal covers 16, 17 are sealingly attached to the cylindrical body 15, for example by brazing or welding.
  • the body of the bulb 10 has a transverse upper portion 16a which is preferably substantially flat and perpendicular to the longitudinal axis X.
  • This upper portion 16a corresponds for example to an outer portion of the top cover 16.
  • the lid 16 may additionally have other shapes on another portion, such as for example a V-shape shown in the figures to better withstand the pressure difference between the inside and the outside of the vacuum bottle 10 .
  • the breaking chamber 13 comprises two electrical contacts 11, 12 which are relatively movable to one another, so as to open or close an electrical circuit. These contacts 11 and 12 are only partially represented on the figure 2 , for the sake of simplification. Conventionally, one of the electrical contacts, called high contact 11, is fixed and passes through the top cover 16 while the other electrical contact, called low contact 12, is movable along the longitudinal axis X and passes through the bottom cover 17. To allow movement of the movable contact 12 while maintaining its sealing, the breaking chamber 13 usually comprises a sealing bellows, which is not shown in the figures for the sake of simplification.
  • each phase of a switchgear has such a breaking pole.
  • This breaking pole 1 comprises an insulating jacket 2, which is preferably made of thermoplastic or thermosetting material, for example epoxy, and which forms a substantially cylindrical housing 3 inside which the vacuum interrupter 10 is placed. high end, the housing 3 is delimited by a transverse advance 4 of the insulating envelope 2, that is to say substantially perpendicular to the longitudinal axis X.
  • the insulating envelope 2 also surrounds two metal connection arms 20, 22 of the breaking pole 1, typically an upstream connection arm 20 corresponding to an arrival of the electric current and a downstream connection arm 22 corresponding to a departure of the current.
  • the vacuum bottle 10 is electrically connected between the upstream connection arm 20 and the downstream connection arm 22, so as to open or close the electrical circuit passing through these two connection arms 20, 22.
  • the electrical connection between the fixed contact 11 of the bulb 10 and the upstream connecting arm 20 is made using a top connector 21 placed at the end of the upstream connecting arm 20 and which rests on the transverse advance 4.
  • This advanced 4 which separates the top connector 21 and the top cover 16 of the vacuum bottle 10, nevertheless has a central passage through which the top connector 21 passes to make the electrical connection between the upstream connection arm 20 and the fixed contact. 11.
  • the downstream connecting arm 22 is extended by a bottom connector 23 and the electrical connection between the movable contact 12 of the bulb 10 and the bottom connector 23 is formed by a known flexible type connection or a sliding contact.
  • the movable contact 12 is actuated via an opening / closing mechanism of the contacts, such as an insulating rod 24.
  • This mechanism for example a spring mechanism, are not detailed here.
  • the breaking pole 1 then comprises fastening means which allow one hand to fix the vacuum bulb 10 inside the insulating casing 2 while keeping the upper part of the bulb against the transverse advance 4 and on the other hand to establish a good electrical connection between the fixed contact 11 and the top connector 21.
  • the fixing means comprise a simple fixing screw 8, which can be introduced through a opening 7 of the casing 2 so as to fix the vacuum bottle 10 against the top connector 21.
  • the top contact 11 comprises for example an orifice 14 which makes it possible to introduce the fixing screw 8 to fix the vacuum bottle 10.
  • the vacuum bottle 10 further comprises a cylindrical insulating sleeve 19 (also sometimes called sock) which surrounds the cylindrical body 15 also covering at least partially the top and bottom covers 16, 17.
  • This sleeve is preferably made of elastomeric material, such as silicone or EPDM (ie Ethylene-Propylene-Diene Monomer), in order to give it sufficient elasticity to surround and remain plated against the vacuum bottle 10.
  • the insulating sleeve 19 has an inner wall 18 which is covered with a layer of conductive paint (for example a metallic paint) or semi-conductive paint (for example a silicone paint) in the vicinity of the top cover 16 and of the bottom cover 17, so as to locally form at each end of the bulb an equipotential screen to remove or strongly lower the dielectric stress at the triple points PT1, PT2 of the vacuum interrupter 10. More precisely, this layer of paint is applied on the one hand in the vicinity of the junction between the top cover 16 and the cylindrical body 15, and on the other hand in the vicinity of the junction between the bottom cover 17 and the cylindrical body 15.
  • a layer of conductive paint for example a metallic paint
  • semi-conductive paint for example a silicone paint
  • a triple point is formed by an edge located at the intersection of a conductive material (in this case the covers 16, 17) and two electrical insulating materials, one of which is generally a gas (in one embodiment). the air and the cylindrical body 15).
  • the conductive or semiconductive paint may be replaced by a semiconductor screen which is overmolded inside the sleeve 19, respectively in the vicinity of the top cover 16 and the bottom cover 17 of the bulb 10. More specifically, a first semiconductor screen is overmolded near the junction between the top cover 16 and the cylindrical body 15, and a second semiconductor screen is overmolded near the junction between the bottom cover 17 and the cylindrical body 15.
  • the invention provides that the insulating sleeve 19 projects over the upper part 16a transverse of the bulb 10 and has at its end a thickening 19a all around the circumference of the bulb 10, as indicated in FIG. figure 2 .
  • this thickening 19a has a thickness A of 10 mm when it is not compressed.
  • This seal 19a of the sleeve 19 is sealed and insulates dielectrically the conductive parts of the top of the bulb, in particular the top connector 21 and the fixed contact 11, of the air zone 3 located between the longitudinal inner wall 6 of the casing 2 and the cylindrical body 15 of the vacuum bottle 10.
  • the seal 19a is sufficiently compressed to expel air from the compressed zone, that is to say on the one hand between the seal 19a and the upper part 16a of the cover 16 and secondly between the seal 19a and the transverse advance 4 of the casing 2.
  • the compression of the seal 19a must take into account the expansion of the parts during temperature variations and the effects of compression set due to the aging of the parts. 20% compression of the seal Sealing 19a is for example sufficient for a range of operating temperature of the vacuum interrupter ranging from -40 ° C to + 100 ° C. For a temperature range of -25 ° C to + 70 ° C, a 15% compression of the seal 19a would be sufficient.
  • the upper portion 16a of the top cover 16 of the vacuum bottle 10 is flat and substantially parallel to the transverse advance 4 of the casing 2, so as to compress the seal 19a against two flat surfaces and substantially perpendicular to the longitudinal direction of the attachment movement of the bulb 10 in the pole 1, which provides a better efficiency in the compression of the seal 19a to ensure the desired seal.
  • the direction of attachment of the vacuum bulb is identical to the direction of compression of the seal, that is to say along the longitudinal axis X.
  • the invention therefore makes it possible to obtain a very simple means of avoiding arcing around the vacuum interrupter, thanks solely to an insulating sleeve of suitable shape.
  • a breaking pole 1 is easy to mount because it is not necessary to precisely center the vacuum bottle 10 in the housing 3 since the seal is on the upper transverse part of the bulb and not on the circular side walls 15.
  • the free air zone in the housing 3 also facilitates the assembly and disassembly of the vacuum bulb 10, for maintenance or recycling operations at the end of life.

Landscapes

  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Abstract

L'invention concerne un pôle de coupure (1) pour appareil électrique de coupure comprenant une enveloppe isolante (2), un connecteur haut (21) et un connecteur bas (22) et une ampoule à vide (10) qui est placée dans l'enveloppe isolante entre le connecteur haut et le connecteur bas, l'ampoule à vide (10) comportant un corps (15) cylindrique selon un axe longitudinal (X) et une partie haute (16a) transversale. L'ampoule à vide (10) comporte un joint d'étanchéité (19a) qui est placé sur la partie haute (16a) et qui est comprimé contre l'enveloppe (2) lorsque l'ampoule à vide (10) est fixée au connecteur haut (21), de façon à isoler le connecteur haut (21) de l'air situé entre l'enveloppe (2) et le corps cylindrique (15). Le joint d'étanchéité (19a) correspond à une extrémité d'un manchon isolant (19) entourant le corps cylindrique (15).The invention relates to a switchgear pole (1) for an electrical switching device comprising an insulating envelope (2), a top connector (21) and a bottom connector (22) and a vacuum interrupter (10) which is placed in the insulating jacket between the top connector and the bottom connector, the vacuum bulb (10) having a cylindrical body (15) along a longitudinal axis (X) and a transverse upper part (16a). The vacuum bottle (10) has a seal (19a) which is placed on the upper part (16a) and which is pressed against the casing (2) when the vacuum bottle (10) is attached to the upper connector (21), so as to isolate the top connector (21) from the air located between the envelope (2) and the cylindrical body (15). The seal (19a) corresponds to an end of an insulating sleeve (19) surrounding the cylindrical body (15).

Description

Domaine technique de l'inventionTechnical field of the invention

La présente invention concerne un pôle de coupure pour un appareil électrique de coupure haute tension, c'est-à-dire un appareil opérant à une tension supérieure à 1000V, ce pôle comprenant une ampoule à vide destinée à assurer la coupure d'un circuit électrique.The present invention relates to a breaking pole for a high-voltage electrical switchgear, that is to say a device operating at a voltage greater than 1000V, this pole comprising a vacuum interrupter intended to cut a circuit electric.

L'invention concerne également un appareil électrique de coupure comportant un tel pôle pour au moins une de ses phases. Dans le présent document, le terme appareil électrique de coupure regroupe indifféremment différents types d'appareils électriques tels qu'un interrupteur, un disjoncteur, un contacteur, un interrupteur fusible, un sectionneur, un recloser, etc.The invention also relates to an electrical switching device comprising such a pole for at least one of its phases. In this document, the term electrical switching device includes different types of electrical devices such as a switch, a circuit breaker, a contactor, a fuse switch, a disconnector, a recloser, etc.

Etat de la techniqueState of the art

Une ampoule à vide est un dispositif de coupure qui comporte un corps généralement sensiblement cylindrique contenant une chambre étanche dans laquelle sont présents deux contacts électriques dont l'un est mobile de façon à pouvoir ouvrir et fermer un circuit électrique passant par ces contacts. L'ampoule à vide est destinée à être intégrée à l'intérieur d'une enveloppe (ou coque) d'un pôle de coupure d'un appareil électrique de coupure. Lorsque l'ampoule à vide est intégrée dans le pôle, les deux contacts électriques situés chacun à une extrémité de l'ampoule sont électriquement connectés à respectivement deux connecteurs électriques du pôle, nommé par exemple connecteur haut et connecteur bas. Ces deux connecteurs sont fixes et un des deux connecteurs est relié au contact mobile par un conducteur souple ou glissant.A vacuum interrupter is a cutoff device which comprises a generally substantially cylindrical body containing a sealed chamber in which there are present two electrical contacts, one of which is movable so as to open and close an electrical circuit passing through these contacts. The vacuum bulb is intended to be integrated inside an envelope (or shell) of a breaking pole of an electrical breaking device. When the vacuum interrupter is integrated in the pole, the two electrical contacts each located at one end of the bulb are electrically connected to respectively two electrical connectors of the pole, named for example high connector and low connector. These two connectors are fixed and one of the two connectors is connected to the movable contact by a flexible or slippery conductor.

Etant donné les fortes valeurs de tensions utilisées, une ampoule à vide doit supporter des contraintes diélectriques importantes. En effet, quand les contacts de l'ampoule à vide sont ouverts, il existe une forte différence de potentiel entre les connecteurs haut et bas du pôle et donc un risque important d'apparition d'un arc électrique entre eux passant autour de l'ampoule. Aussi, pour améliorer l'isolation électrique autour de l'ampoule et éviter notamment l'apparition de problèmes d'isolation entre les connecteurs haut et bas d'un même pôle ou entre deux pôles adjacents d'un même appareil, il est déjà connu de surmouler complètement le corps cylindrique de l'ampoule avec une couche habituellement en matériau époxy, comme décrit dans le document EP2835812A1 . Cela évite en particulier qu'il y ait de l'air entre les parois externes du corps de l'ampoule et l'enveloppe du pôle.Given the high voltage values used, a vacuum interrupter must withstand significant dielectric stresses. Indeed, when the contacts of the vacuum bulb are open, there is a strong potential difference between the top and bottom connectors of the pole and therefore a significant risk of occurrence of an electric arc between them passing around the bulb. Also, to improve the electrical insulation around the bulb and particularly avoid the appearance of insulation problems between the top and bottom connectors of the same pole or between two adjacent poles of the same device, it is already known to completely overmold the cylindrical body of the ampoule with a layer usually made of epoxy material, as described in FIG. document EP2835812A1 . This avoids in particular that there is air between the outer walls of the body of the bulb and the envelope of the pole.

Néanmoins, réaliser un surmoulage autour du corps de l'ampoule est une opération délicate car il faut notamment s'assurer de la bonne adhésion du surmoulage époxy sur les parois de l'ampoule. De plus, cela rend plus difficiles les opérations de démantèlement et de démontage de l'ampoule, que ce soit en fin de vie ou pour remplacer l'ampoule après des tests non conformes de décharges partielles, à cause de problème d'adhérence ou de collage du surmoulage.However, making an overmolding around the body of the bulb is a delicate operation because it is necessary in particular to ensure the good adhesion of the overmoulding epoxy on the walls of the bulb. In addition, this makes it more difficult to dismantle and dismantle the bulb, either at the end of its life or to replace the bulb after non-compliant tests of partial discharges, because of adhesion problem or overmoulding.

Il existe aussi des solutions où l'ampoule est insérée dans une enveloppe, généralement en thermoplastique ou thermodurcissable, et dans lesquelles un ou plusieurs anneaux d'étanchéité sont placés sur le pourtour circulaire de l'ampoule de façon à être coincés entre les parois latérales du corps de l'ampoule et la paroi interne de l'enveloppe du pôle, comme décrit dans le document EP1938350A1 . Mais cette disposition rend plus complexe l'assemblage et le montage de l'ampoule car, pour être efficaces, les anneaux d'étanchéité ont besoin que le centrage du corps cylindrique de l'ampoule par rapport à l'enveloppe soit fait de façon très précis et reproductible. Ces anneaux d'étanchéité influencent aussi la répartition des équipotentielles et augmentent la contrainte diélectrique, notamment à l'intérieur de l'ampoule à vide. De plus, cette solution nécessite un très bon état de surface de la paroi interne de l'enveloppe du pôle.There are also solutions where the ampoule is inserted into an envelope, usually thermoplastic or thermosetting, and in which one or more sealing rings are placed on the circular periphery of the bulb so as to be wedged between the side walls. of the bulb body and the inner wall of the pole envelope, as described in the document EP1938350A1 . But this arrangement makes it more difficult to assemble and assemble the bulb because, in order to be effective, the sealing rings require that the centering of the cylindrical body of the bulb with respect to the envelope be done very efficiently. accurate and reproducible. These sealing rings also influence the equipotential distribution and increase the dielectric stress, especially inside the vacuum bulb. In addition, this solution requires a very good surface state of the inner wall of the envelope of the pole.

D'autres solutions sont également citées dans les documents DE19634451C1 , WO0041199A1 et DE102006062225A1 .Other solutions are also mentioned in the documents DE19634451C1 , WO0041199A1 and DE102006062225A1 .

Une autre solution consisterait à ne pas utiliser l'air ambiant mais un gaz isolant tel que le SF6 autour de l'ampoule à vide pour améliorer les performances diélectriques. Néanmoins, il est nécessaire alors d'utiliser une enveloppe plus complexe car étanche et équipée de traversées pour les conducteurs de courant. De plus, cette solution est très défavorable pour l'environnement, vis-à-vis de la pollution et de l'effet de serre, et complique le recyclage.Another solution would be to not use ambient air but an insulating gas such as SF6 around the vacuum bulb to improve the dielectric performance. Nevertheless, it is necessary then to use a more complex shell because waterproof and equipped with bushings for current conductors. In addition, this solution is very unfavorable for the environment, with respect to pollution and the greenhouse effect, and complicates recycling.

L'invention a donc pour but de concevoir un système simple, économique pour éviter le stress diélectrique autour de l'ampoule à vide, et ne présentant pas les différents inconvénients cités ci-dessus.The invention therefore aims to design a simple system, economical to avoid the dielectric stress around the vacuum bulb, and not having the various disadvantages mentioned above.

Exposé de l'inventionPresentation of the invention

Ce but est atteint par un pôle de coupure comprenant une enveloppe isolante, un connecteur haut et un connecteur bas et une ampoule à vide qui est placée dans l'enveloppe isolante entre le connecteur haut et le connecteur bas, l'ampoule à vide comportant un corps cylindrique selon un axe longitudinal et une partie haute transversale, le corps cylindrique logeant un contact fixe et un contact mobile reliés électriquement respectivement avec le connecteur haut et le connecteur bas. L'ampoule à vide comporte un joint d'étanchéité placé sur la partie haute et qui est comprimé contre l'enveloppe lorsque l'ampoule à vide est fixée au connecteur haut, de façon à isoler le connecteur haut et le contact fixe de l'air situé entre l'enveloppe et le corps cylindrique de l'ampoule à vide et le joint d'étanchéité correspond à une extrémité d'un manchon isolant entourant le corps cylindrique de l'ampoule à vide.This object is achieved by a breaking pole comprising an insulating envelope, a high connector and a low connector and a vacuum interrupter which is placed in the insulating envelope between the top connector and the bottom connector, the vacuum interrupter comprising a cylindrical body along a longitudinal axis and a transverse upper part, the cylindrical body housing a fixed contact and a movable contact electrically connected respectively with the top connector and the bottom connector. The vacuum interrupter has a seal placed on the top and which is compressed against the envelope when the vacuum interrupter is attached to the top connector, so as to isolate the top connector and the fixed contact of the air located between the casing and the cylindrical body of the vacuum bottle and the seal corresponds to an end of an insulating sleeve surrounding the cylindrical body of the vacuum bulb.

Selon une caractéristique, l'ampoule à vide comporte un couvercle haut et un couvercle bas fermant les deux extrémités du corps cylindrique, la partie haute de l'ampoule à vide étant une partie plane appartenant au couvercle.According to one characteristic, the vacuum bottle comprises a top cover and a bottom cover closing the two ends of the cylindrical body, the upper part of the vacuum bottle being a flat part belonging to the cover.

Selon une autre caractéristique, le manchon isolant est réalisé en matériau élastomère.According to another characteristic, the insulating sleeve is made of elastomeric material.

Selon une autre caractéristique, le joint d'étanchéité est comprimé contre une avancée transversale de l'enveloppe isolante, laquelle avancée transversale est sensiblement parallèle à la partie haute, de façon à comprimer le joint d'étanchéité contre deux surfaces sensiblement perpendiculaires à l'axe longitudinal.According to another characteristic, the seal is compressed against a transverse advance of the insulating envelope, which transverse advance is substantially parallel to the upper part, so as to compress the seal against two surfaces substantially perpendicular to the longitudinal axis.

Selon une autre caractéristique, le manchon isolant comporte une paroi intérieure qui est recouverte d'une peinture conductrice ou semi-conductrice appliquée au voisinage d'une jonction entre le couvercle haut et le corps cylindrique et au voisinage d'une jonction entre le couvercle bas et le corps cylindrique.According to another characteristic, the insulating sleeve comprises an inner wall which is covered with a conductive or semi-conductive paint applied in the vicinity of a junction between the top cover and the cylindrical body and in the vicinity of a junction between the bottom cover and the cylindrical body.

Selon une autre caractéristique, le manchon isolant comporte un écran semi-conducteur qui est surmoulé à l'intérieur du manchon au voisinage d'une jonction entre le couvercle haut et le corps cylindrique et au voisinage d'une jonction entre le couvercle bas et le corps cylindrique.According to another characteristic, the insulating sleeve comprises a semiconductor screen which is overmolded inside the sleeve in the vicinity of a junction between the top cover and the cylindrical body and in the vicinity of a junction between the bottom cover and the cylindrical body.

Selon une autre caractéristique, l'ampoule à vide est fixée au connecteur haut au moyen d'une vis de fixation.According to another characteristic, the vacuum bulb is fixed to the top connector by means of a fixing screw.

L'invention se rapporte également un appareil électrique de coupure comportant un tel pôle de coupure pour au moins une de ses phases.The invention also relates to an electrical cutting apparatus comprising such a breaking pole for at least one of its phases.

Description détailléedetailed description

D'autres caractéristiques vont apparaître dans la description détaillée qui suit faite en regard des dessins annexés dans lesquels :

  • la figure 1 montre une vue simplifiée en coupe d'un mode de réalisation d'un pôle de coupure conforme à l'invention,
  • la figure 2 représente une vue simplifiée en coupe d'une ampoule à vide susceptible d'être utilisée dans le pôle de coupure de la figure 1.
Other characteristics will appear in the following detailed description with reference to the appended drawings in which:
  • the figure 1 shows a simplified sectional view of an embodiment of a breaking pole according to the invention,
  • the figure 2 represents a simplified sectional view of a vacuum interrupter which can be used in the breaking pole of the figure 1 .

En référence à la figure 2, une ampoule à vide 10 possède un corps sensiblement cylindrique contenant une chambre de coupure étanche 13 dans laquelle règne le vide, c'est-à-dire une très basse pression contrôlée d'air ou d'un autre gaz. Le corps de l'ampoule 10 est formé par une paroi 15 de forme cylindrique le long d'un axe longitudinal X et qui est fermée à ses deux extrémités par deux couvercles métalliques, appelés dans le présent document couvercle haut 16 et couvercle bas 17. La paroi cylindrique 15 est réalisée dans un matériau diélectrique, préférentiellement en céramique, et les deux couvercles métalliques 16, 17 sont solidarisés de façon étanche au corps cylindrique 15, par exemple par brasure ou par soudure. Le corps de l'ampoule 10 possède une partie haute transversale 16a qui de préférence est sensiblement plane et perpendiculaire à l'axe longitudinal X. Cette partie haute 16a correspond par exemple à une portion extérieure du couvercle haut 16. De façon connue, le couvercle haut 16 peut en plus présenter d'autres formes sur une autre portion, telle que par exemple une forme en V représentée sur les figures afin de mieux supporter la différence de pression entre l'intérieur et l'extérieur de l'ampoule à vide 10.With reference to the figure 2 , a vacuum interrupter 10 has a substantially cylindrical body containing a sealed break chamber 13 in which the vacuum prevails, that is to say a very low controlled pressure of air or another gas. The body of the bulb 10 is formed by a wall 15 of cylindrical shape along a longitudinal axis X and which is closed at both ends by two metal covers, referred to herein as the top cover 16 and the bottom cover 17. The cylindrical wall 15 is made of a dielectric material, preferably ceramic, and the two metal covers 16, 17 are sealingly attached to the cylindrical body 15, for example by brazing or welding. The body of the bulb 10 has a transverse upper portion 16a which is preferably substantially flat and perpendicular to the longitudinal axis X. This upper portion 16a corresponds for example to an outer portion of the top cover 16. In known manner, the lid 16 may additionally have other shapes on another portion, such as for example a V-shape shown in the figures to better withstand the pressure difference between the inside and the outside of the vacuum bottle 10 .

La chambre de coupure 13 comporte deux contacts électriques 11, 12 qui sont mobiles relativement l'un à l'autre, de façon à pouvoir ouvrir ou fermer un circuit électrique. Ces contacts 11 et 12 ne sont que partiellement représentés sur la figure 2, par souci de simplification. De manière classique, un des contacts électriques, appelé contact haut 11, est fixe et traverse le couvercle haut 16 tandis que l'autre contact électrique, appelé contact bas 12, est mobile le long de l'axe longitudinal X et traverse le couvercle bas 17. Pour permettre le déplacement du contact mobile 12 tout en conservant son étanchéité, la chambre de coupure 13 comprend habituellement un soufflet d'étanchéité, qui n'est pas représenté sur les figures par souci de simplification.The breaking chamber 13 comprises two electrical contacts 11, 12 which are relatively movable to one another, so as to open or close an electrical circuit. These contacts 11 and 12 are only partially represented on the figure 2 , for the sake of simplification. Conventionally, one of the electrical contacts, called high contact 11, is fixed and passes through the top cover 16 while the other electrical contact, called low contact 12, is movable along the longitudinal axis X and passes through the bottom cover 17. To allow movement of the movable contact 12 while maintaining its sealing, the breaking chamber 13 usually comprises a sealing bellows, which is not shown in the figures for the sake of simplification.

En référence à la figure 1, une telle ampoule à vide 10 est destinée à être utilisée dans un pôle de coupure 1 d'un appareil électrique de coupure haute tension. Préférentiellement, chaque phase d'un appareil de coupure possède un tel pôle de coupure. Ce pôle de coupure 1 comprend une enveloppe isolante 2, qui est de préférence en matériau thermoplastique ou thermodurcissable, par exemple en époxy, et qui forme un logement 3 sensiblement cylindrique à l'intérieur duquel est placée l'ampoule à vide 10. A son extrémité haute, le logement 3 est délimité par une avancée transversale 4 de l'enveloppe isolante 2, c'est-à-dire sensiblement perpendiculaire à l'axe longitudinal X. L'enveloppe isolante 2 entoure également deux bras de connexion métalliques 20, 22 du pôle de coupure 1, typiquement un bras de connexion amont 20 correspondant à une arrivée du courant électrique et un bras de connexion aval 22 correspondant à un départ du courant.With reference to the figure 1 such a vacuum bulb 10 is intended to be used in a switching pole 1 of a high-voltage switchgear. Preferably, each phase of a switchgear has such a breaking pole. This breaking pole 1 comprises an insulating jacket 2, which is preferably made of thermoplastic or thermosetting material, for example epoxy, and which forms a substantially cylindrical housing 3 inside which the vacuum interrupter 10 is placed. high end, the housing 3 is delimited by a transverse advance 4 of the insulating envelope 2, that is to say substantially perpendicular to the longitudinal axis X. The insulating envelope 2 also surrounds two metal connection arms 20, 22 of the breaking pole 1, typically an upstream connection arm 20 corresponding to an arrival of the electric current and a downstream connection arm 22 corresponding to a departure of the current.

L'ampoule à vide 10 est électriquement raccordée entre le bras de connexion amont 20 et le bras de connexion aval 22, de façon à pouvoir ouvrir ou fermer le circuit électrique passant par ces deux bras de connexion 20, 22. La connexion électrique entre le contact fixe 11 de l'ampoule 10 et le bras de connexion amont 20 est réalisée à l'aide d'un connecteur haut 21 placé à l'extrémité du bras de connexion amont 20 et qui repose sur l'avancée transversale 4. Cette avancée 4, qui permet de séparer le connecteur haut 21 et le couvercle haut 16 de l'ampoule à vide 10, possède néanmoins un passage central traversé par le connecteur haut 21 pour effectuer la connexion électrique entre le bras de connexion amont 20 et le contact fixe 11.The vacuum bottle 10 is electrically connected between the upstream connection arm 20 and the downstream connection arm 22, so as to open or close the electrical circuit passing through these two connection arms 20, 22. The electrical connection between the fixed contact 11 of the bulb 10 and the upstream connecting arm 20 is made using a top connector 21 placed at the end of the upstream connecting arm 20 and which rests on the transverse advance 4. This advanced 4, which separates the top connector 21 and the top cover 16 of the vacuum bottle 10, nevertheless has a central passage through which the top connector 21 passes to make the electrical connection between the upstream connection arm 20 and the fixed contact. 11.

De même, le bras de connexion aval 22 se prolonge par un connecteur bas 23 et la connexion électrique entre le contact mobile 12 de l'ampoule 10 et ce connecteur bas 23 est réalisée par une liaison connue de type souple ou un contact glissant. Le contact mobile 12 est actionné par l'intermédiaire d'un mécanisme d'ouverture/fermeture des contacts, tel qu'une bielle isolante 24. Les détails de ce mécanisme, par exemple un mécanisme à ressort, ne sont pas détaillés ici.Similarly, the downstream connecting arm 22 is extended by a bottom connector 23 and the electrical connection between the movable contact 12 of the bulb 10 and the bottom connector 23 is formed by a known flexible type connection or a sliding contact. The movable contact 12 is actuated via an opening / closing mechanism of the contacts, such as an insulating rod 24. The details of this mechanism, for example a spring mechanism, are not detailed here.

Le pôle de coupure 1 comporte ensuite des moyens de fixation qui permettent d'une part de fixer l'ampoule à vide 10 à l'intérieur de l'enveloppe isolante 2 en maintenant la partie haute de l'ampoule contre l'avancée transversale 4, et d'autre part d'établir une bonne connexion électrique entre le contact fixe 11 et le connecteur haut 21. Dans le mode de réalisation présenté, les moyens de fixation comportent une simple vis de fixation 8, qui peut être introduite à travers une ouverture 7 de l'enveloppe 2 de façon à fixer l'ampoule à vide 10 contre le connecteur haut 21. Le contact haut 11 comporte par exemple un orifice 14 qui permet d'introduire la vis de fixation 8 pour fixer l'ampoule à vide 10.The breaking pole 1 then comprises fastening means which allow one hand to fix the vacuum bulb 10 inside the insulating casing 2 while keeping the upper part of the bulb against the transverse advance 4 and on the other hand to establish a good electrical connection between the fixed contact 11 and the top connector 21. In the embodiment shown, the fixing means comprise a simple fixing screw 8, which can be introduced through a opening 7 of the casing 2 so as to fix the vacuum bottle 10 against the top connector 21. The top contact 11 comprises for example an orifice 14 which makes it possible to introduce the fixing screw 8 to fix the vacuum bottle 10.

L'ampoule à vide 10 comporte en plus un manchon cylindrique isolant 19 (appelé aussi parfois chaussette) qui entoure le corps cylindrique 15 en recouvrant aussi au moins partiellement les couvercles haut et bas 16, 17. Ce manchon est préférentiellement réalisé en matériau élastomère, tel que silicone ou EPDM (c'est-à-dire Ethylène-Propylène-Diène Monomère), afin de lui donner une élasticité suffisante pour entourer et rester plaqué contre l'ampoule à vide 10.The vacuum bottle 10 further comprises a cylindrical insulating sleeve 19 (also sometimes called sock) which surrounds the cylindrical body 15 also covering at least partially the top and bottom covers 16, 17. This sleeve is preferably made of elastomeric material, such as silicone or EPDM (ie Ethylene-Propylene-Diene Monomer), in order to give it sufficient elasticity to surround and remain plated against the vacuum bottle 10.

Selon un mode de réalisation, le manchon isolant 19 possède une paroi intérieure 18 qui est recouverte d'une couche de peinture conductrice (par exemple une peinture métallique) ou semi-conductrice (par exemple une peinture silicone) au voisinage du couvercle haut 16 et du couvercle bas 17, de façon à former localement à chaque extrémité de l'ampoule un écran équipotentiel permettant de supprimer ou d'abaisser fortement les contraintes diélectriques aux points triples PT1, PT2 de l'ampoule à vide 10. Plus précisément, cette couche de peinture est appliquée d'une part au voisinage de la jonction entre le couvercle haut 16 et le corps cylindrique 15, et d'autre part au voisinage de la jonction entre le couvercle bas 17 et le corps cylindrique 15.According to one embodiment, the insulating sleeve 19 has an inner wall 18 which is covered with a layer of conductive paint (for example a metallic paint) or semi-conductive paint (for example a silicone paint) in the vicinity of the top cover 16 and of the bottom cover 17, so as to locally form at each end of the bulb an equipotential screen to remove or strongly lower the dielectric stress at the triple points PT1, PT2 of the vacuum interrupter 10. More precisely, this layer of paint is applied on the one hand in the vicinity of the junction between the top cover 16 and the cylindrical body 15, and on the other hand in the vicinity of the junction between the bottom cover 17 and the cylindrical body 15.

Cela permet donc d'éviter tout risque de départ d'amorçage entre la partie haute et la partie basse de l'ampoule à vide 10, quelques soient les contraintes environnementales. Pour rappel, un point triple est formé par une arête située à l'intersection d'un matériau conducteur (en l'occurrence les couvercles 16, 17) et de deux matériaux isolants électriques dont l'un est généralement un gaz (en l'occurrence l'air et le corps cylindrique 15).This therefore avoids any risk of starting priming between the upper part and the lower part of the vacuum bottle 10, whatever the environmental constraints. As a reminder, a triple point is formed by an edge located at the intersection of a conductive material (in this case the covers 16, 17) and two electrical insulating materials, one of which is generally a gas (in one embodiment). the air and the cylindrical body 15).

Selon un autre mode réalisation équivalent, la peinture conductrice ou semi-conductrice peut être remplacée par un écran semi-conducteur qui est surmoulé à l'intérieur du manchon 19, respectivement au voisinage du couvercle haut 16 et du couvercle bas 17 de l'ampoule 10. Plus précisément, un premier écran semi-conducteur est surmoulé au voisinage de la jonction entre le couvercle haut 16 et le corps cylindrique 15, et un second écran semi-conducteur est surmoulé au voisinage de la jonction entre le couvercle bas 17 et le corps cylindrique 15.According to another equivalent embodiment, the conductive or semiconductive paint may be replaced by a semiconductor screen which is overmolded inside the sleeve 19, respectively in the vicinity of the top cover 16 and the bottom cover 17 of the bulb 10. More specifically, a first semiconductor screen is overmolded near the junction between the top cover 16 and the cylindrical body 15, and a second semiconductor screen is overmolded near the junction between the bottom cover 17 and the cylindrical body 15.

Comme visible en figure 1, lorsque l'ampoule à vide 10 est fixée dans le pôle, il existe dans le logement 3 une zone remplie d'air entre l'enveloppe 2 et l'ampoule à vide 10, en particulier entre la paroi interne longitudinale 6 de l'enveloppe 2 et la paroi externe du corps cylindrique 15 de l'ampoule à vide 10. Or, cette zone d'air est sensible au niveau diélectrique car elle représente un terrain favorable à un contournement diélectrique passant autour de l'ampoule 10, c'est-à-dire un amorçage diélectrique entre les parties conductrices du haut de l'ampoule (à savoir contact fixe 11, connecteur haut 21 et couvercle haut 16) et les parties conductrices du bas de l'ampoule (à savoir contact mobile 12, connecteur bas 23 et couvercle bas 17), que ce soit lors d'essais de chocs de foudre, d'essais diélectriques à la fréquence industrielle (50-60 Hz) ou de vieillissement en atmosphère humide.As visible in figure 1 when the vacuum interrupter 10 is fixed in the pole, there is in the housing 3 an air-filled zone between the envelope 2 and the vacuum interrupter 10, in particular between the longitudinal inner wall 6 of the casing 2 and the outer wall of the cylindrical body 15 of the vacuum ampoule 10. However, this air zone is sensitive at the dielectric level because it represents a favorable terrain for a dielectric bypass passing around the bulb 10, that is to say a dielectric ignition between the conductive parts of the top of the bulb (namely fixed contact 11, top connector 21 and top cover 16) and the conductive parts the bottom of the bulb (namely movable contact 12, bottom connector 23 and bottom cover 17), whether during lightning shock tests, dielectric tests at the industrial frequency (50-60 Hz) or aging in a humid atmosphere.

C'est pourquoi l'invention prévoit que le manchon isolant 19 déborde sur la partie haute 16a transversale de l'ampoule 10 et présente à son extrémité un épaississement 19a tout autour de la circonférence de l'ampoule 10, comme indiqué en figure 2. Selon un mode de réalisation préféré, cet épaississement 19a possède une épaisseur A de 10 mm lorsqu'il n'est pas compressé. Une fois que l'ampoule à vide 10 est fixée dans le logement 3 du pôle 1 grâce à la vis de fixation 8, l'épaississement 19a est alors comprimé entre la partie haute 16a du couvercle haut 16 de l'ampoule 10 et l'avancée transversale 4 de l'enveloppe 2 du pôle 1, de façon à présenter une épaisseur A' inférieure à l'épaisseur A, par exemple environ 8 mm, comme indiqué en figure 1. On obtient ainsi une compression à plat de 20% de l'épaississement de sorte que celui-ci joue alors le rôle d'un joint d'étanchéité 19a.This is why the invention provides that the insulating sleeve 19 projects over the upper part 16a transverse of the bulb 10 and has at its end a thickening 19a all around the circumference of the bulb 10, as indicated in FIG. figure 2 . According to a preferred embodiment, this thickening 19a has a thickness A of 10 mm when it is not compressed. Once the vacuum bottle 10 is fixed in the housing 3 of the pole 1 by means of the fixing screw 8, the thickening 19a is then compressed between the upper part 16a of the top cover 16 of the bulb 10 and the transverse advance 4 of the envelope 2 of the pole 1, so as to have a thickness A 'less than the thickness A, for example about 8 mm, as indicated in FIG. figure 1 . This results in a flat compression of 20% of the thickening so that it then plays the role of a seal 19a.

Ce joint d'étanchéité 19a du manchon 19 est étanche et isole diélectriquement les parties conductrices du haut de l'ampoule, en particulier le connecteur haut 21 et le contact fixe 11, de la zone d'air 3 située entre la paroi interne longitudinale 6 de l'enveloppe 2 et le corps cylindrique 15 de l'ampoule à vide 10. Le joint d'étanchéité 19a est suffisamment comprimé pour chasser l'air de la zone comprimée, c'est-à-dire d'une part entre le joint 19a et la partie haute 16a du couvercle 16 et d'autre part entre le joint 19a et l'avancée transversale 4 de l'enveloppe 2. Comme il empêche toute présence d'air circulant entre les parties conductrices du haut de l'ampoule et les parties conductrices du bas de l'ampoule, il permet d'éviter toute apparition d'un arc électrique entre elles, en particulier lorsqu'elles se trouvent à des potentiels élevés différents quand les contacts 11, 12 de l'ampoule sont séparés.This seal 19a of the sleeve 19 is sealed and insulates dielectrically the conductive parts of the top of the bulb, in particular the top connector 21 and the fixed contact 11, of the air zone 3 located between the longitudinal inner wall 6 of the casing 2 and the cylindrical body 15 of the vacuum bottle 10. The seal 19a is sufficiently compressed to expel air from the compressed zone, that is to say on the one hand between the seal 19a and the upper part 16a of the cover 16 and secondly between the seal 19a and the transverse advance 4 of the casing 2. As it prevents any presence of air flowing between the conductive parts of the top of the bulb and the conductive parts of the bottom of the bulb, it avoids any occurrence of an electric arc between them, especially when they are at different high potentials when the contacts 11, 12 of the bulb are separated .

La compression du joint d'étanchéité 19a doit tenir compte de la dilatation des pièces lors des variations de températures et des effets de déformation rémanente à la compression, liée au vieillissement des pièces. Une compression de 20% du joint d'étanchéité 19a est par exemple suffisante pour une plage de température d'utilisation de l'ampoule à vide s'étendant de -40°C à +100°C. Pour une plage de température s'étendant de -25°C à +70°C, une compression de 15% du joint d'étanchéité 19a serait suffisante.The compression of the seal 19a must take into account the expansion of the parts during temperature variations and the effects of compression set due to the aging of the parts. 20% compression of the seal Sealing 19a is for example sufficient for a range of operating temperature of the vacuum interrupter ranging from -40 ° C to + 100 ° C. For a temperature range of -25 ° C to + 70 ° C, a 15% compression of the seal 19a would be sufficient.

De façon préférée, la partie haute 16a du couvercle haut 16 de l'ampoule à vide 10 est plane et sensiblement parallèle à l'avancée transversale 4 de l'enveloppe 2, de façon à comprimer le joint d'étanchéité 19a contre deux surfaces planes et sensiblement perpendiculaires à la direction longitudinale du mouvement de fixation de l'ampoule 10 dans le pôle 1, ce qui procure une meilleure efficacité à la compression du joint 19a pour assurer l'étanchéité voulue. En effet, le sens de fixation de l'ampoule à vide est identique au sens de compression du joint d'étanchéité, c'est-à-dire selon l'axe longitudinal X.Preferably, the upper portion 16a of the top cover 16 of the vacuum bottle 10 is flat and substantially parallel to the transverse advance 4 of the casing 2, so as to compress the seal 19a against two flat surfaces and substantially perpendicular to the longitudinal direction of the attachment movement of the bulb 10 in the pole 1, which provides a better efficiency in the compression of the seal 19a to ensure the desired seal. Indeed, the direction of attachment of the vacuum bulb is identical to the direction of compression of the seal, that is to say along the longitudinal axis X.

En résumé, l'invention permet donc d'obtenir un moyen très simple d'éviter des arcs électriques autour de l'ampoule à vide, grâce uniquement à un manchon isolant de forme adaptée. En effet, un tel pôle de coupure 1 est facile à monter car il n'est pas nécessaire de centrer précisément l'ampoule à vide 10 dans le logement 3 vu que l'étanchéité se fait sur la partie transversale haute de l'ampoule et non sur les parois latérales circulaires 15. La zone d'air libre dans le logement 3 facilite aussi le montage et le démontage de l'ampoule à vide 10, pour des opérations de maintenance ou de recyclage en fin de vie.In summary, the invention therefore makes it possible to obtain a very simple means of avoiding arcing around the vacuum interrupter, thanks solely to an insulating sleeve of suitable shape. Indeed, such a breaking pole 1 is easy to mount because it is not necessary to precisely center the vacuum bottle 10 in the housing 3 since the seal is on the upper transverse part of the bulb and not on the circular side walls 15. The free air zone in the housing 3 also facilitates the assembly and disassembly of the vacuum bulb 10, for maintenance or recycling operations at the end of life.

Claims (7)

Pôle de coupure (1) comprenant une enveloppe isolante (2), un connecteur haut (21) et un connecteur bas (22) et une ampoule à vide (10) qui est placée dans l'enveloppe isolante entre le connecteur haut et le connecteur bas, l'ampoule à vide (10) comportant un corps (15) cylindrique selon un axe longitudinal (X) et une partie haute (16a) transversale sensiblement perpendiculaire à l'axe longitudinal (X), le corps cylindrique (15) logeant un contact fixe (11) et un contact mobile (12) reliés électriquement respectivement avec le connecteur haut (21) et le connecteur bas (22),
caractérisé en ce que l'ampoule à vide (10) comporte un joint d'étanchéité (19a) placé sur ladite partie haute (16a) et qui est comprimé contre l'enveloppe (2) lorsque l'ampoule à vide (10) est fixée au connecteur haut (21), de façon à isoler le connecteur haut (21) et le contact fixe (11) du volume d'air (3) situé entre l'enveloppe (2) et le corps cylindrique (15) de l'ampoule à vide (10),
et en ce que le joint d'étanchéité (19a) correspond à une extrémité d'un manchon isolant (19) entourant le corps cylindrique (15) de l'ampoule à vide (10).Cutoff pole (1) comprising an insulating envelope (2), a top connector (21) and a bottom connector (22) and a vacuum interrupter (10) which is placed in the insulating envelope between the top connector and the connector bottom, the vacuum bottle (10) having a body (15) cylindrical about a longitudinal axis (X) and a top portion (16a) transverse substantially perpendicular to the longitudinal axis (X), the cylindrical body (15) housing a fixed contact (11) and a movable contact (12) electrically connected respectively to the top connector (21) and the bottom connector (22),
characterized in that the vacuum bottle (10) has a seal (19a) on said upper portion (16a) and which is pressed against the casing (2) when the vacuum bottle (10) is attached to the top connector (21), so as to isolate the top connector (21) and the fixed contact (11) from the air volume (3) between the envelope (2) and the cylindrical body (15) of the vacuum bulb (10),
and in that the seal (19a) corresponds to an end of an insulating sleeve (19) surrounding the cylindrical body (15) of the vacuum bulb (10). Pôle de coupure selon la revendication 1, dans lequel l'ampoule à vide (10) comporte un couvercle haut (16) et un couvercle bas (17) fermant les deux extrémités du corps cylindrique (15), caractérisé en ce que la partie haute (16a) de l'ampoule à vide (10) est une partie plane appartenant au couvercle (16).Cutoff pole according to claim 1, wherein the vacuum bottle (10) has a top cover (16) and a bottom cover (17) closing both ends of the cylindrical body (15), characterized in that the upper part (16a) of the vacuum bottle (10) is a flat part belonging to the lid (16). Pôle de coupure selon la revendication 2, caractérisé en ce que l'ampoule à vide (10) est fixée au connecteur haut (21) au moyen d'une vis de fixation (8) selon l'axe longitudinal (X) et le joint d'étanchéité (19a) est comprimé contre une avancée transversale (4) de l'enveloppe isolante (2), laquelle avancée transversale (4) est sensiblement parallèle à la partie haute (16a), de façon à comprimer le joint d'étanchéité (19a) contre deux surfaces sensiblement perpendiculaires à l'axe longitudinal (X).Switching pole according to Claim 2, characterized in that the vacuum bulb (10) is fixed to the top connector (21) by means of a fastening screw (8) along the longitudinal axis (X) and the joint sealing member (19a) is compressed against a transverse advance (4) of the insulating envelope (2), which transverse projection (4) is substantially parallel to the upper part (16a), so as to compress the seal (19a) against two surfaces substantially perpendicular to the longitudinal axis (X). Pôle de coupure selon la revendication 1, caractérisé en ce que le manchon isolant (19) est réalisé en matériau élastomère.Cutoff pole according to claim 1, characterized in that the insulating sleeve (19) is made of elastomeric material. Pôle de coupure selon la revendication 2, caractérisé en ce que le manchon isolant (19) comporte une paroi intérieure (18) qui est recouverte d'une peinture conductrice ou semi-conductrice appliquée au voisinage d'une jonction entre le couvercle haut (16) et le corps cylindrique (15) et au voisinage d'une jonction entre le couvercle bas (17) et le corps cylindrique (15).Cutoff pole according to claim 2, characterized in that the insulating sleeve (19) has an inner wall (18) which is covered with a conductive or semi-conductive paint applied in the vicinity of a junction between the top cover (16). ) and the cylindrical body (15) and in the vicinity of a junction between the bottom cover (17) and the cylindrical body (15). Pôle de coupure selon la revendication 2, caractérisé en ce que le manchon isolant (19) comporte un écran semi-conducteur qui est surmoulé à l'intérieur du manchon (19) au voisinage d'une jonction entre le couvercle haut (16) et le corps cylindrique (15) et au voisinage d'une jonction entre le couvercle bas (17) et le corps cylindrique (15).Cutoff pole according to claim 2, characterized in that the insulating sleeve (19) comprises a semiconductor screen which is overmolded inside the sleeve (19) in the vicinity of a junction between the top cover (16) and the cylindrical body (15) and in the vicinity of a junction between the bottom cover (17) and the cylindrical body (15). Appareil électrique de coupure caractérisé en ce qu'il comporte au moins un pôle de coupure (1) selon l'une des revendications précédentes.Electrical switching device characterized in that it comprises at least one breaking pole (1) according to one of the preceding claims.
EP18201680.8A 2017-11-16 2018-10-22 Cutoff pole for electrical switchgear Withdrawn EP3486934A1 (en)

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FR1760801A FR3073663A1 (en) 2017-11-16 2017-11-16 CUT POLE FOR ELECTRICAL CUTTING APPARATUS

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DE19634451C1 (en) * 1996-08-26 1998-01-29 Driescher Eltech Werk Load switch
WO2000041199A1 (en) * 1999-01-06 2000-07-13 Nu-Lec Industries Pty Ltd Method for assembly of insulated housings for electrical equipment and incorporation of circuit interrupters therein
FR2808117A1 (en) * 2000-03-31 2001-10-26 Schneider Electric Ind Sa ELECTRICAL SWITCHING APPARATUS COMPRISING A VACUUM BULB AND A FLEXIBLE ELECTRICAL CONNECTION
DE102006062225A1 (en) * 2006-12-22 2008-06-26 Decom Gmbh insulating housing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021018426A1 (en) * 2019-07-30 2021-02-04 Siemens Energy Global GmbH & Co. KG Interrupter unit having a vacuum tube and an insulating housing
CN114175201A (en) * 2019-07-30 2022-03-11 西门子能源全球有限公司 Interruption unit with vacuum tube and insulating housing
US11915895B2 (en) 2019-07-30 2024-02-27 Siemens Energy Global GmbH & Co. KG Interrupter unit having a vacuum tube and an insulating housing
CN114175201B (en) * 2019-07-30 2024-03-08 西门子能源全球有限公司 Interrupt unit with vacuum tube and insulating housing

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