EP0823721B1 - Self-blasting electrical circuit breaker with a rotating arc - Google Patents

Self-blasting electrical circuit breaker with a rotating arc Download PDF

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Publication number
EP0823721B1
EP0823721B1 EP19970410075 EP97410075A EP0823721B1 EP 0823721 B1 EP0823721 B1 EP 0823721B1 EP 19970410075 EP19970410075 EP 19970410075 EP 97410075 A EP97410075 A EP 97410075A EP 0823721 B1 EP0823721 B1 EP 0823721B1
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EP
European Patent Office
Prior art keywords
contacts
circuit breaker
arcing
contact
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19970410075
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German (de)
French (fr)
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EP0823721A1 (en
Inventor
Jean-Claude Faye
Alain Chapusot
Pierre Chevrier
Georges Bernard
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Siemens Transmission and Distribution SA
Original Assignee
Schneider Electric High Voltage SA
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Publication of EP0823721A1 publication Critical patent/EP0823721A1/en
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    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/98—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being initiated by an auxiliary arc or a section of the arc, without any moving parts for producing or increasing the flow

Definitions

  • the present invention solves this problem and proposes a rotary arc circuit breaker and expansion, simple design, improving the dielectric characteristics of the bottom insulating while facilitating the breaking of small currents.
  • the subject of the present invention is a circuit breaker according to claim 1.
  • the annular edge of the envelope adjacent to the insulating bottom carries the movable main contact and the aforementioned conductive bottom is coupled to the contact movable arc whose control mechanism cooperates with sequencing means establishing the appropriate opening and closing sequences of the moving contacts.
  • the aforementioned insulator is placed above the piece of contact of the arcing contact associated with the upper bottom of the breaking chamber.
  • the outside diameter of the movable arcing contact is greater the outside diameter of the fixed arcing contact.
  • it comprises a means for uncoupling the envelope above of the insulator, after the separation of the arcing contacts, once the breaking has been carried out.
  • the insulator, or insulating bottom, of the breaking chamber is crossed by the fixed arcing contact, which cooperates with the movable arcing contact crossing the conductive bottom to which it is electrically and mechanically connected.
  • it comprises an electromagnetic coil for rotating the arc arranged coaxially around the fixed arcing contact, the insulator being placed behind the coil.
  • the movable arcing contact is hollow.
  • the enclosure is filled with sulfur hexafluoride at pressure atmospheric or under pressure.
  • a switching chamber 1 belonging to one of the poles of a medium or high voltage self-expanding and rotating arc circuit breaker.
  • This room 1 contains two arcing contacts 2, 3 respectively fixed and mobile, and is intended to be housed inside a sealed enclosure (not shown) filled with a rigid gas high dielectric, in particular sulfur hexafluoride at atmospheric pressure or at overpressure.
  • This enclosure also has two main contacts 4.5 mounted in parallel with the aforementioned arcing contacts 2, 3 outside of the breaking chamber 1.
  • This interrupting chamber 1 is confined by a cylindrical envelope 6, closed at its two ends opposite by two bottoms 7, 8.
  • the two aforementioned arcing contacts 2, 3, respectively fixed and mobile, are mounted coaxially inside said chamber 1 and pass through the two bottoms 7, 8 respectively.
  • the cylindrical casing 6 as well as one 8 of the two bottoms 7, 8, crossed by the movable contact 3, are metallic.
  • the opposite bottom 7 is fixedly crossed by the fixed contact 2 and is made of an insulating material so providing electrical insulation between the fixed contact 2 and the cylindrical casing 6.
  • a coil of arc blowing not shown, which is capped in a known manner with a electrode 11 (not shown) constituting an arc migration track and arranged in sight of the moving arcing contact 3.
  • the insulating part 7, or insulator, is placed behind this coil and therefore at the top of the switching chamber 1.
  • the two arcing contacts 2, 3 are electrically connected, respectively, to two pads of current generally formed by the two funds (not shown) of the aforementioned enclosure.
  • the movable arcing contact 3 is constituted by a hollow tube making it possible to communicate, in the open position of the circuit breaker shown on the right side of the figure, the breaking chamber 1 with the enclosure, which constitutes an expansion chamber, thanks to the presence at the base of the movable contact 3 of communication orifices (not shown) between the tubular interior of contact 3 and the enclosure. Note that this communication can also be achieved through the fixed arcing contact 2, which can also be hollow.
  • the cylindrical casing 6 of the switching chamber 1 extends projecting from the bottom insulator 7 by a collar 9 arranged in main movable contact 5 intended to cooperate with the main fixed contact 4 of the circuit breaker.
  • the bottom metal 8 is electrically connected and mechanically coupled to the movable arcing contact 3 of so that the appropriate contact opening and closing sequences mobiles 3, 5 are made.
  • the contact control mechanism mobile 3 (not shown) cooperates with sequencing means 10 provided between the metal bottom 8 and movable arcing contact 3.
  • means will also be provided for uncoupling the casing 6 from the insulator 7, once the cut has been made.
  • the permanent current passes through the movable contact 3, the metal bottom 8, then the cylindrical casing 6, then the main contacts 4, 5.
  • a small fraction of the current traverses a parallel circuit constituted by the movable arcing contact 3, the electrode, the coil of the fixed contact 2 and the conductive bottom of the enclosure (not shown).
  • the opening of the circuit breaker is controlled by sliding down a rod control (not shown) driving the tubular support 3b of the movable arcing contact 3 and thereby the cylindrical casing 6 carrying the movable main contact 5.
  • the main contacts 4, 5 are opened without forming an arc, and from the switching of the current in the parallel circuit, the coil generates a magnetic field which blows the arc formed during the separation of the arcing contacts 2, 3 during the continued movement of opening of the circuit breaker.
  • the arc drawn in the breaking chamber 1 causes heating and a rise in pressure of the gas contained in this chamber 1 which gas escapes through the movable tubular contact 3 towards the expansion chamber constituted by the enclosure, by pneumatically blowing the arc extending between the contact movable arc 3 and the electrode 11.
  • the dust generated during the cut falls, by gravity, on the metal bottom 8 and do not reach the insulating bottom 7, which thus has good dielectric strength.
  • said envelope 6 will advantageously be disconnected from the insulator 7, this in order to avoid having, over time, an insulator 7 under tension when the circuit breaker is open.
  • the invention can of course be used for all the poles of a circuit breaker multipolar autoexpansion, for example having an enclosure common to all the poles.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)

Description

La présente invention concerne un disjoncteur du genre comprenant une enceinte étanche remplie d'un gaz à rigidité diélectrique élevée et renfermant un ou plusieurs pôles, chaque pôle comprenant :

  • une chambre de coupure délimitée par une enveloppe de forme sensiblement cylindrique obturée d'une manière étanche à ses deux extrémités par des fonds,
  • une paire de contacts d'arc, respectivement un contact d'arc fixe et un contact d'arc mobile mu par un mécanisme de commande, disposés coaxialement dans ladite chambre de coupure et traversant chacun l'un desdits fonds, l'un au moins desdits contacts comportant des conduits d'écoulement de gaz permettant de faire communiquer en position séparée des contacts d'arc, la chambre de coupure avec ladite enceinte, laquelle forme ainsi une chambre d'expansion,
  • une bobine ou analogue agencée à l'intérieur de la chambre de coupure de manière à créer dans la zone de séparation des contacts d'arc un champ magnétique de soufflage en rotation d'un arc tiré entre les contacts d'arc séparés,
  • une paire de contacts principaux, en parallèle avec les contacts d'arc, disposés à l'extérieur de la chambre de coupure et agencés pour s'ouvrir avant la séparation des contacts d'arc lors d'une manoeuvre d'ouverture du disjoncteur, ladite enveloppe et l'un des fonds précités étant réalisés en un matériau conducteur et reliés électriquement au contact d'arc associé audit fond, tandis que l'autre fond est en un matériau isolant et forme un isolateur assurant l'isolation électrique en position d'ouverture des contacts, l'extrémité de ladite enveloppe adjacente au fond isolant portant l'un des contacts principaux.
The present invention relates to a circuit breaker of the type comprising a sealed enclosure filled with a gas of high dielectric strength and containing one or more poles, each pole comprising:
  • a breaking chamber delimited by an envelope of substantially cylindrical shape closed in a leaktight manner at its two ends by bottoms,
  • a pair of arcing contacts, respectively a fixed arcing contact and a movable arcing contact moved by a control mechanism, arranged coaxially in said breaking chamber and each passing through one of said bottoms, at least one said contacts comprising gas flow conduits making it possible to communicate in a separate position of the arcing contacts, the breaking chamber with said enclosure, which thus forms an expansion chamber,
  • a coil or the like arranged inside the breaking chamber so as to create in the separation zone of the arcing contacts a magnetic field for blowing in rotation of an arc drawn between the separated arcing contacts,
  • a pair of main contacts, in parallel with the arcing contacts, arranged outside the breaking chamber and arranged to open before the separation of the arcing contacts during an opening operation of the circuit breaker, said casing and one of the aforementioned bottoms being made of a conductive material and electrically connected to the arcing contact associated with said bottom, while the other bottom is made of an insulating material and forms an insulator ensuring electrical insulation in position d opening of the contacts, the end of said envelope adjacent to the insulating bottom carrying one of the main contacts.

On connaít un disjoncteur à arc tournant et à expansion du genre précédemment mentionné, et tel que décrit dans le brevet FR 2 617 633 de la demanderesse, dans lequel le fond isolant précité de la chambre de coupure est traversé par le contact d'arc mobile coulissant, lequel coopère avec un contact d'arc fixe traversant le fond métallique auquel il est connecté électriquement. Dans ce dispositif, le fond isolant est placé à la partie inférieure de la chambre de coupure et est éloigné de la zone de coupure.We know a rotary arc and expansion circuit breaker of the kind previously mentioned, and as described in patent FR 2 617 633 of the applicant, in which the insulating bottom above the interrupting chamber is crossed by the sliding movable arcing contact, which cooperates with a fixed arcing contact crossing the metal bottom to which it is connected electrically. In this device, the insulating bottom is placed at the bottom of the breaking chamber and is distant from the breaking zone.

Or, un inconvénient de ce disjoncteur tient en ce que les poussières (poudres métalliques etc...) générées lors de la coupure, principalement des forts courants, viennent se poser sous l'effet de la gravité sur le fond isolant et diminuent de ce fait ses caractéristiques diélectriques.One drawback of this circuit breaker is that the dust (powders metallic etc ...) generated during cutting, mainly strong currents, come arise under the effect of gravity on the insulating bottom and thereby reduce its dielectric characteristics.

La présente invention résout ce problème et propose un disjoncteur à arc tournant et à expansion, de conception simple, améliorant les caractéristiques diélectriques du fond isolant tout en facilitant la coupure des petits courants.The present invention solves this problem and proposes a rotary arc circuit breaker and expansion, simple design, improving the dielectric characteristics of the bottom insulating while facilitating the breaking of small currents.

A cet effet, la présente invention a pour objet un disjoncteur selon la revendication 1. Selon une réalisation particulière, le bord annulaire de l'enveloppe adjacent au fond isolant porte le contact principal mobile et le fond conducteur précité est couplé au contact d'arc mobile dont le mécanisme de commande coopère avec des moyens de séquencement établissant les séquences d'ouverture et de fermeture appropriées des contacts mobiles.To this end, the subject of the present invention is a circuit breaker according to claim 1. According to a particular embodiment, the annular edge of the envelope adjacent to the insulating bottom carries the movable main contact and the aforementioned conductive bottom is coupled to the contact movable arc whose control mechanism cooperates with sequencing means establishing the appropriate opening and closing sequences of the moving contacts.

Selon une caractéristique particulière, l'isolateur précité est placé au dessus de la pièce de contact du contact d'arc associé au fond supérieur de la chambre de coupure.According to a particular characteristic, the aforementioned insulator is placed above the piece of contact of the arcing contact associated with the upper bottom of the breaking chamber.

Selon une autre caractéristique, le diamètre extérieur du contact d'arc mobile est supérieur au diamètre extérieur du contact d'arc fixe.According to another characteristic, the outside diameter of the movable arcing contact is greater the outside diameter of the fixed arcing contact.

Selon une autre caractéristique, il comporte un moyen pour désaccoupler l'enveloppe précitée de l'isolateur, après la séparation des contacts d'arc, une fois la coupure réalisée. According to another characteristic, it comprises a means for uncoupling the envelope above of the insulator, after the separation of the arcing contacts, once the breaking has been carried out.

Selon une autre caractéristique, l'isolateur, ou fond isolant, de la chambre de coupure est traversé par le contact d'arc fixe, lequel coopère avec le contact d'arc mobile traversant le fond conducteur auquel il est connecté électriquement et mécaniquement.According to another characteristic, the insulator, or insulating bottom, of the breaking chamber is crossed by the fixed arcing contact, which cooperates with the movable arcing contact crossing the conductive bottom to which it is electrically and mechanically connected.

Avantageusement, il comporte une bobine électromagnétique de mise en rotation de l'arc agencée coaxialement autour du contact d'arc fixe, l'isolateur étant placé derrière la bobine.Advantageously, it comprises an electromagnetic coil for rotating the arc arranged coaxially around the fixed arcing contact, the insulator being placed behind the coil.

Avantageusement, le contact d'arc mobile est creux.Advantageously, the movable arcing contact is hollow.

Avantageusement, l'enceinte est remplie d'hexafluorure de soufre à la pression atmosphérique ou sous surpression.Advantageously, the enclosure is filled with sulfur hexafluoride at pressure atmospheric or under pressure.

Mais d'autres avantages et caractéristiques de l'invention apparaítront mieux dans la description détaillée qui suit et se réfère au dessin annexé donné uniquement à titre d'exemple et dans lequel :

  • La figure unique est une vue schématique en coupe axiale d'un disjoncteur selon l'invention, la demi-coupe de droite représentant ce disjoncteur en position ouverte et la demi-coupe de gauche en position fermée.
But other advantages and characteristics of the invention will appear better in the detailed description which follows and refers to the appended drawing given solely by way of example and in which:
  • The single figure is a schematic view in axial section of a circuit breaker according to the invention, the right half-section representing this circuit-breaker in the open position and the left half-section in the closed position.

Sur la figure unique, on voit une chambre de coupure 1 appartenant à l'un des pôles d'un disjoncteur à autoexpansion et à arc tournant moyenne ou haute tension. Cette chambre 1 renferme deux contacts d'arc 2, 3 respectivement fixe et mobile, et est destinée à être logée à l'intérieur d'une enceinte étanche (non représentée) remplie d'un gaz à rigidité diélectrique élevée, notamment de l'hexafluorure de soufre à la pression atmosphérique ou à surpression. Cette enceinte comporte également deux contacts principaux 4,5 montés en parallèle avec les contacts d'arc précités 2, 3 à l'extérieur de la chambre de coupure 1.In the single figure, we see a switching chamber 1 belonging to one of the poles of a medium or high voltage self-expanding and rotating arc circuit breaker. This room 1 contains two arcing contacts 2, 3 respectively fixed and mobile, and is intended to be housed inside a sealed enclosure (not shown) filled with a rigid gas high dielectric, in particular sulfur hexafluoride at atmospheric pressure or at overpressure. This enclosure also has two main contacts 4.5 mounted in parallel with the aforementioned arcing contacts 2, 3 outside of the breaking chamber 1.

Cette chambre de coupure 1 est confinée par une enveloppe cylindrique 6, obturée à ses deux extrémités opposées par deux fonds 7, 8. Les deux contacts d'arc précités 2, 3, respectivement fixe et mobile, sont montés coaxialement à l'intérieur de ladite chambre 1 et traversent respectivement les deux fonds 7, 8. L'enveloppe cylindrique 6 ainsi que l'un 8 des deux fonds 7, 8, traversé par le contact mobile 3, sont métalliques. Le fond opposé 7 est traversé de manière étanche par le contact fixe 2 et est en un matériau isolant de manière à assurer l'isolation électrique entre le contact fixe 2 et l'enveloppe cylindrique 6.This interrupting chamber 1 is confined by a cylindrical envelope 6, closed at its two ends opposite by two bottoms 7, 8. The two aforementioned arcing contacts 2, 3, respectively fixed and mobile, are mounted coaxially inside said chamber 1 and pass through the two bottoms 7, 8 respectively. The cylindrical casing 6 as well as one 8 of the two bottoms 7, 8, crossed by the movable contact 3, are metallic. The opposite bottom 7 is fixedly crossed by the fixed contact 2 and is made of an insulating material so providing electrical insulation between the fixed contact 2 and the cylindrical casing 6.

A l'intérieur de la pièce de contact 2a du contact d'arc fixe 2 est montée une bobine de soufflage d'arc, non représentée, laquelle est coiffée de manière connue d'une électrode 11 (non représentée) constituant une piste de migration de l'arc et disposée en regard du contact d'arc mobile 3.Inside the contact part 2a of the fixed arcing contact 2 is mounted a coil of arc blowing, not shown, which is capped in a known manner with a electrode 11 (not shown) constituting an arc migration track and arranged in sight of the moving arcing contact 3.

La pièce isolante 7, ou isolateur, est placée derrière cette bobine et par conséquent, en haut de la chambre de coupure 1.The insulating part 7, or insulator, is placed behind this coil and therefore at the top of the switching chamber 1.

Les deux contacts d'arc 2, 3 sont reliés électriquement, respectivement, à deux plages d'amenée du courant généralement formées par les deux fonds (non représentés) de l'enceinte précitée.The two arcing contacts 2, 3 are electrically connected, respectively, to two pads of current generally formed by the two funds (not shown) of the aforementioned enclosure.

Le contact d'arc mobile 3 est constitué par un tube creux permettant de faire communiquer, en position d'ouverture du disjoncteur représentée sur la partie droite de la figure, la chambre de coupure 1 avec l'enceinte, laquelle constitue une chambre d'expansion, grâce à la présence à la base du contact mobile 3 d'orifices de communication (non représentés) entre l'intérieur tubulaire du contact 3 et l'enceinte. On notera que cette communication peut également être réalisée à travers le contact d'arc fixe 2, lequel peut également être creux.The movable arcing contact 3 is constituted by a hollow tube making it possible to communicate, in the open position of the circuit breaker shown on the right side of the figure, the breaking chamber 1 with the enclosure, which constitutes an expansion chamber, thanks to the presence at the base of the movable contact 3 of communication orifices (not shown) between the tubular interior of contact 3 and the enclosure. Note that this communication can also be achieved through the fixed arcing contact 2, which can also be hollow.

L'enveloppe cylindrique 6 de la chambre de coupure 1 se prolonge en saillie du fond isolant 7 par un collet 9 agencé en contact mobile principal 5 destiné à coopérer avec le contact fixe principal 4 du disjoncteur. A l'extrémité opposée de l'enveloppe 6, le fond métallique 8 est relié électriquement et couplé mécaniquement au contact d'arc mobile 3 de manière à ce que les séquences appropriées d'ouverture et de fermeture des contacts mobiles 3, 5 soient réalisées. A cet effet, le mécanisme de commande du contact mobile 3 (non représenté) coopère avec des moyens de séquencement 10 prévus entre le fond métallique 8 et le contact d'arc mobile 3.The cylindrical casing 6 of the switching chamber 1 extends projecting from the bottom insulator 7 by a collar 9 arranged in main movable contact 5 intended to cooperate with the main fixed contact 4 of the circuit breaker. At the opposite end of the envelope 6, the bottom metal 8 is electrically connected and mechanically coupled to the movable arcing contact 3 of so that the appropriate contact opening and closing sequences mobiles 3, 5 are made. For this purpose, the contact control mechanism mobile 3 (not shown) cooperates with sequencing means 10 provided between the metal bottom 8 and movable arcing contact 3.

Avantageusement, seront également prévus des moyens pour désaccoupler l'enveloppe 6 de l'isolant 7, une fois la coupure réalisée.Advantageously, means will also be provided for uncoupling the casing 6 from the insulator 7, once the cut has been made.

Le fonctionnement du disjoncteur selon l'invention ressort de l'exposé précédent et va être décrit brièvement dans ce qui suit :The operation of the circuit breaker according to the invention is apparent from the preceding description and will be briefly described in the following:

En position fermée du disjoncteur représentée sur la demi-vue de gauche de la figure unique, le courant permanent passe à travers le contact mobile 3, le fond métallique 8, puis l'enveloppe cylindrique 6, puis les contacts principaux 4, 5. Une faible fraction du courant parcourt un circuit parallèle constitué par le contact d'arc mobile 3, l'électrode, la bobine du contact fixe 2 et le fond conducteur de l'enceinte (non représenté).In the closed position of the circuit breaker shown in the left half-view of the figure single, the permanent current passes through the movable contact 3, the metal bottom 8, then the cylindrical casing 6, then the main contacts 4, 5. A small fraction of the current traverses a parallel circuit constituted by the movable arcing contact 3, the electrode, the coil of the fixed contact 2 and the conductive bottom of the enclosure (not shown).

L'ouverture du disjoncteur est commandée par un coulissement vers le bas d'une tige de commande (non représentée) entraínant le support tubulaire 3b du contact d'arc mobile 3 et par là-même l'enveloppe cylindrique 6 portant le contact principal mobile 5.The opening of the circuit breaker is controlled by sliding down a rod control (not shown) driving the tubular support 3b of the movable arcing contact 3 and thereby the cylindrical casing 6 carrying the movable main contact 5.

Pendant une première phase du mouvement d'ouverture du disjoncteur, les contacts principaux 4, 5 s'ouvrent tandis que la pièce de contact 3a du contact d'arc mobile 3 reste aboutée à l'électrode du contact d'arc fixe 2 grâce à la présence des moyens de séquencement 10. Dès la séparation des contacts principaux 4, 5, le courant est commuté dans le circuit parallèle constitué par le contact d'arc mobile 3, la bobine et le contact d'arc fixe 2.During a first phase of the circuit breaker opening movement, the contacts main 4, 5 open while the contact part 3a of the movable arcing contact 3 remains abutting the electrode of the fixed arcing contact 2 thanks to the presence of the means of Sequencing 10. As soon as the main contacts 4, 5 are separated, the current is switched in the parallel circuit formed by the movable arcing contact 3, the coil and the arcing contact fixed 2.

On remarquera que le mouvement de l'enveloppe 6 génère alors un mouvement général des gaz qui facilite la coupure des petits courants. It will be noted that the movement of the envelope 6 then generates a general movement of the gas which facilitates the breaking of small currents.

De plus, dans le cas où le diamètre extérieur du contact mobile 3 est supérieur au diamètre extérieur du contact fixe 2, le mouvement du gaz d'expansion pendant la précourse crée un léger pistonnage favorisant également la coupure des petits courants.In addition, in the case where the outside diameter of the movable contact 3 is greater than the diameter outside of the fixed contact 2, the movement of the expansion gas during the pre-stroke creates a light pistoning also favoring the breaking of small currents.

L'ouverture des contacts principaux 4, 5 s'effectue sans formation d'un arc, et dès la commutation du courant dans le circuit parallèle, la bobine engendre un champ magnétique qui souffle l'arc se formant lors de la séparation des contacts d'arc 2, 3 au cours du mouvement poursuivi d'ouverture du disjoncteur. L'arc tiré dans la chambre de coupure 1 provoque un échauffement et une montée en pression du gaz contenu dans cette chambre 1 lequel gaz s'échappe par le contact mobile tubulaire 3 vers la chambre d'expansion constituée par l'enceinte, en soufflant pneumatiquement l'arc s'étendant entre le contact d'arc mobile 3 et l'électrode 11.The main contacts 4, 5 are opened without forming an arc, and from the switching of the current in the parallel circuit, the coil generates a magnetic field which blows the arc formed during the separation of the arcing contacts 2, 3 during the continued movement of opening of the circuit breaker. The arc drawn in the breaking chamber 1 causes heating and a rise in pressure of the gas contained in this chamber 1 which gas escapes through the movable tubular contact 3 towards the expansion chamber constituted by the enclosure, by pneumatically blowing the arc extending between the contact movable arc 3 and the electrode 11.

Ainsi, grâce à l'invention, les poussières générées lors de la coupure tombent, par gravité, sur le fond métallique 8 et n'atteignent pas le fond isolant 7, lequel présente ainsi une bonne tenue diélectrique.Thus, thanks to the invention, the dust generated during the cut falls, by gravity, on the metal bottom 8 and do not reach the insulating bottom 7, which thus has good dielectric strength.

Au cours d'un mouvement poursuivi de l'enveloppe 6, une fois les contacts d'arc 2, 3 séparés et la coupure réalisée, ladite enveloppe 6 sera avantageusement déconnectée de l'isolant 7, ceci afin d'éviter d'avoir, à longueur de temps un isolant 7 sous tension lorsque le disjoncteur est ouvert.During a continued movement of the casing 6, once the arcing contacts 2, 3 separated and the cut made, said envelope 6 will advantageously be disconnected from the insulator 7, this in order to avoid having, over time, an insulator 7 under tension when the circuit breaker is open.

On notera que l'invention pourra bien sûr être utilisée pour tous les pôles d'un disjoncteur à autoexpansion multipolaire, ayant par exemple une enceinte commune à tous les pôles.Note that the invention can of course be used for all the poles of a circuit breaker multipolar autoexpansion, for example having an enclosure common to all the poles.

Claims (9)

  1. A circuit breaker of the kind comprising a sealed enclosure filled with a high dielectric strength gas and housing one or more poles, each pole comprising:
    a breaking chamber (1) bounded by a casing (6) of appreciably cylindrical shape sealed off tightly at both ends by end-plates (7, 8),
    a pair of arcing contacts (2, 3), respectively a stationary arcing contact (2) and a movable arcing contact (3) moved by an operating mechanism, arranged coaxially in said breaking chamber (I) and each passing through one of said end-plates (7, 8), one at least of said contacts (2, 3) comprising gas flow ducts enabling the breaking chamber (1) to be made to communicate in the separated position of the arcing contacts (2, 3) with said enclosure, which thus forms an expansion chamber,
    a coil or similar arranged inside the breaking chamber (1) so as to create a magnetic field in the separation zone of the arcing contacts (2, 3) for blowing-out in rotation an arc drawn between the separated arcing contacts (2, 3),
    a pair of main contacts (4, 5), in parallel with the arcing contacts (2, 3), located outside the breaking chamber (1) and arranged to open before separation of the arcing contacts (2, 3) takes place when an opening operation of the circuit breaker takes place, said casing (6) and one (8) of the above-mentioned end-plates (7, 8) being made of conducting material and electrically connected to the arcing contact (3) associated to said end-plate (8), whereas the other end-plate (7) is made of insulating material and forms an insulator performing electrical insulation in the open position of the contacts (2, 3), the end of said casing (6) adjacent to the insulating end-plate (7) bearing one of the main contacts (4, 5),
    characterized in that the above-mentioned insulator (7) is placed at the top of the breaking chamber (1) so that the dust generated when breaking takes place falls by gravity onto the metal end-plate (8) and does not reach the insulating end-plate (7).
  2. The circuit breaker according to claim 1, characterized in that the annular edge (9) of the casing (6) adjacent to the insulating end-plate (7) bears the movable main contact (5) and that the above-mentioned conducting end-plate (8) is coupled to the movable arcing contact (3) the operating mechanism whereof operates in conjunction with sequencing means (10) establishing appropriate opening and closing sequences of the movable contacts (3, 5).
  3. The circuit breaker according to claim 1 or 2, characterized in that the above-mentioned insulator (7) is placed above the contact part (2a) of the arcing contact (2) associated to the upper end-plate (7) of the breaking chamber (1).
  4. The circuit breaker according to any one of the claims 1 to 3, characterized in that the external diameter of the movable arcing contact (3) is greater than the external diameter of the stationary arcing contact (2).
  5. The circuit breaker according to any one of the claims 1 to 4, characterized in that it comprises a means for decoupling the above-mentioned casing (6) from the insulator (7) after separation of the arcing contacts (2, 3) has taken place once breaking has been performed.
  6. The circuit breaker according to any one of the claims 1 to 5, characterized in that the stationary arcing contact (2) passes through the insulator (7), or insulating end-plate, of the breaking chamber (1) and operates in conjunction with the movable arcing contact (3) passing through the conducting end-plate (8) to which it is electrically and mechanically connected.
  7. The circuit breaker according to any one of the foregoing claims, characterized in that it comprises an electromagnetic coil for making the arc rotate arranged coaxially around the stationary arcing contact (2), the insulator (7) being placed behind the coil.
  8. The circuit breaker according to any one of the foregoing claims, characterized in that the movable arcing contact (3) is hollow.
  9. The circuit breaker according to any one of the foregoing claims, characterized in that the enclosure is filled with sulphur hexafluoride at atmospheric pressure or at overpressure.
EP19970410075 1996-08-09 1997-07-16 Self-blasting electrical circuit breaker with a rotating arc Expired - Lifetime EP0823721B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9610232 1996-08-09
FR9610232A FR2752329B1 (en) 1996-08-09 1996-08-09 CIRCUIT BREAKER WITH ROTATING ARC AND EXPANSION

Publications (2)

Publication Number Publication Date
EP0823721A1 EP0823721A1 (en) 1998-02-11
EP0823721B1 true EP0823721B1 (en) 2002-02-20

Family

ID=9495073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970410075 Expired - Lifetime EP0823721B1 (en) 1996-08-09 1997-07-16 Self-blasting electrical circuit breaker with a rotating arc

Country Status (3)

Country Link
EP (1) EP0823721B1 (en)
DE (1) DE69710533D1 (en)
FR (1) FR2752329B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3104391A1 (en) * 2015-06-10 2016-12-14 General Electric Technology GmbH Gas-insulated electric apparatus filled with a dielectric gas

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH662443A5 (en) * 1983-10-28 1987-09-30 Bbc Brown Boveri & Cie EXHAUST GAS SWITCH.
FR2617633B1 (en) * 1987-07-02 1989-11-17 Merlin Gerin CIRCUIT BREAKER WITH ROTATING ARC AND EXPANSION

Also Published As

Publication number Publication date
EP0823721A1 (en) 1998-02-11
FR2752329A1 (en) 1998-02-13
DE69710533D1 (en) 2002-03-28
FR2752329B1 (en) 1998-09-25

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