EP0101371B1 - Electrical switch with rotating arc - Google Patents

Electrical switch with rotating arc Download PDF

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Publication number
EP0101371B1
EP0101371B1 EP83401612A EP83401612A EP0101371B1 EP 0101371 B1 EP0101371 B1 EP 0101371B1 EP 83401612 A EP83401612 A EP 83401612A EP 83401612 A EP83401612 A EP 83401612A EP 0101371 B1 EP0101371 B1 EP 0101371B1
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EP
European Patent Office
Prior art keywords
circuit breaker
arc
contact assembly
core
annular electrode
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
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EP83401612A
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German (de)
French (fr)
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EP0101371A1 (en
Inventor
Olivier Bouilliez
Michel Imbert
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Merlin Gerin SA
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Merlin Gerin SA
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Priority to AT83401612T priority Critical patent/ATE18961T1/en
Publication of EP0101371A1 publication Critical patent/EP0101371A1/en
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Publication of EP0101371B1 publication Critical patent/EP0101371B1/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
    • H01H33/982—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 in which the pressure-generating arc is rotated by a magnetic field

Definitions

  • a known switch of the kind mentioned requires low opening control energy, the magnetic arc blowing field being derived from the current to be interrupted.
  • the core is formed by a tubular metal part made of ferromagnetic material delimiting the gas circulation duct.
  • This duct has a circular section and serves as a housing for an organ for absorbing the products of decomposition of the blowing gas.
  • This member is arranged between two metal grids for the purpose of purifying and cooling the blowing gases. The presence of this absorption member in the conduit nevertheless precludes an efficient circulation of the gas in the direction of exhaust with possible formation of an ionized gas plug in the arc zone.
  • the coil is coaxially surrounded by a ferromagnetic tubular yoke extended by a deflector arranged around the extension zone of the arc.
  • This deflector protects the envelope against the effects of the arc, but prevents gas from circulating outside the fixed contact assembly. As a result, the breaking capacity of such a switch is limited.
  • the object of the present invention is to remedy these drawbacks and to enable the production of an efficient rotating arc switch.
  • the arc extension zone located at the front of the fixed contact assembly communicates freely with the opposite posterior zone both from the inside and from the outside of said assembly, the first path of the gas from the inside taking place through the said conduit and the second path from the outside intervening between the said fixed contact assembly and the internal wall of the envelope.
  • the present invention starts from a different design in that it increases, on the one hand, the magnetic blowing, that is to say the rotation of the arc by providing a ferromagnetic core inside the coil, and that it avoids, on the other hand, any zone of stagnation of ionized gases in the central zone confined by the arc.
  • the gases subjected to the action of the arc can escape freely on either side of the arc towards colder zones of the enclosure whose total volume is thus put to contribution. This gas flow does not blow the arc.
  • the core is preferably connected in series with the blow coil to maintain the magnetic blow during a switching of the arc on the core.
  • the exhaust duct can be formed inside the tubular core or between the internal face of the coil and the external face of a solid core of a smaller diameter or, of course, by a combination of these means .
  • the longitudinal profile of the exhaust duct is preferably shaped as a nozzle having a neck to which is connected, upstream, a convergent and, downstream, a divergent to promote flow in the direction of exhaust out of the zone d 'bow.
  • the blowing coil is surrounded externally by a yoke for reinforcing the magnetic field, and the opposite electrode has gas circulation orifices.
  • the waterproof envelope 10 is recognized, confining an enclosure 12 filled with a gas with high dielectric strength, such as sulfur hexafluoride.
  • a gas with high dielectric strength such as sulfur hexafluoride.
  • the casing 10 also contains arcing contacts constituted by two annular electrodes 24, 26, arranged face to face and tangential to the pivoting path of the end of the movable shunting contact 20.
  • the directory electrode 24 belongs to a fixed assembly 28 comprising an annular coil 30 associated with the rear face of the electrode 24 and fixed to a support 32.
  • a ferromagnetic core 34 in the form of an olive is disposed inside the coil 30, the front face or end 36 being close to the annular electrode 24.
  • the core 34 is mounted at its rear part on a fixing plate 38 fixed by studs 40 to the support 32 with interposition of insulating washers 42.
  • the studs 40 pass through the coil 30 and are welded to the rear of the annular electrode 24.
  • Such an assembly is described in the patent French FR-A-2,464,550 and allows the ferromagnetic core 34 to be isolated from the support 32, so as to keep the blowing coil 30 in circuit in the event of arcing on the core 34.
  • the coil 30 is connected between the support 32 and the annular electrode 24.
  • the diameter of the core 34 is less than the internal diameter of the coil 30, so as to provide an annular duct 44 allowing gas to escape through the fixed assembly 28.
  • the shape in olive of the core 34 defines a nozzle with converging inlet 46 and at divergent line 48, facilitating an escape of gases from the arc zone adjacent to the annular electrode 24.
  • a flow in opposite direction towards the annular electrode 24 is on the other hand braked.
  • a cylinder head 50 can be placed outside the coil 30.
  • the presence of the core 34 and possibly of the yoke 50 makes it possible to increase the intensity of the magnetic blowing field of the arc anchored on the annular electrode 24 and to cause its extinction.
  • the gases heated and ionized by the action of the arc in the vicinity of the annular electrode 24 can circulate freely outwards and inwards, escaping through the conduit formed by the interval 44. This thus avoids any stagnation of ionized gases in the central part of the fixed contact assembly 28 capable of hindering the extinction of the arc or of causing re-strikes.
  • This circulation has no direct blowing effect on the arc itself and only participates indirectly in cutting the current.
  • the choice of the section of the exhaust duct 44 and of the core 34 results from a compromise between the need to have a section of iron sufficient for a reinforcement of the magnetic field and a section sufficient for the exhaust of the gas in order not to brake the gas circulation too much.
  • FIG. 3 similar to FIG. 2 illustrates an alternative embodiment of the fixed contact assembly 28 in which a gas exhaust pipe 52 is formed inside a hollow core 54.
  • the pipe 52 is arranged in the form of a nozzle facilitating the evacuation of gases out of the arc zone, and it is clear that the operation is absolutely identical to that described above with reference to FIG. 2.
  • the evacuation through the core 54 can be combined with an evacuation of the coil, of the type shown in FIG. 2.
  • the annular electrode 26 opposite the electrode 24 has orifices 56 allowing gases to escape from the central zone confined by the rotating arc.
  • the gas circulation device according to the invention can, of course, be applied to any other type of rotary arc switch, for example of the type described in French patent FR-A-2,464,550, and the invention n is not limited to the embodiment more particularly described, but it extends to a switch in which the core 34, 54 is not at the same potential as the annular electrode 24, or that in which the structure of the fixed contact assembly would be different. It is noted that the first path of the gas from the inside takes place through the conduit 44, 52, while the second path from the outside takes place between the fixed contact assembly 28 and the internal lateral wall of the envelope. 10.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Arc Welding Control (AREA)

Abstract

A rotating arc circuit breaker comprises a blow-out coil fitted at the rear face of an annular electrode and containing a ferromagnetic core. A gas outlet channel is contrived inside coil in order to prevent any formation of an ionized gas lock in the zone defined by the rotating arc.

Description

L'invention concerne un interrupteur électrique à autosoufflage par rotation de l'arc sous l'action d'un champ magnétique engendré par le courant à interrompre comprenant:

  • - une enveloppe étanche remplie d'un gaz à rigidité diélectrique élevée,
  • - un ensemble de contact fixe, monté libre dans l'enceinte confinée par l'enveloppe,
  • - uneélectrodeannulaireappartenantauditen- semble de contact fixe et formant une piste annulaire de rotation de l'arc sous l'action d'un champ magnétique engendré par une bobine tubulaire disposée coaxialement à l'arrière de l'électrode annulaire,
  • - un noyau ferromagnétique s'étendant coaxialement à l'intérieur de la bobine tubulaire et présentant une face terminale voisine de ladite électrode annulaire, et
  • - un conduit ménagé dans ledit ensemble de contact fixe en traversant intérieurement la bobine tubulaire et l'électrode annulaire.
The invention relates to an electric switch with self-blowing by rotation of the arc under the action of a magnetic field generated by the current to be interrupted, comprising:
  • - a sealed envelope filled with a gas with high dielectric strength,
  • - a fixed contact assembly, mounted freely in the enclosure confined by the envelope,
  • - an annular electrode belonging to the fixed contact auditory and forming an annular track for rotation of the arc under the action of a magnetic field generated by a tubular coil arranged coaxially behind the annular electrode,
  • a ferromagnetic core extending coaxially inside the tubular coil and having an end face close to said annular electrode, and
  • - A conduit formed in said fixed contact assembly internally passing through the tubular coil and the annular electrode.

Un interrupteur connu du genre mentionné (demande de brevet allemand DE-A-2.511.238) nécessite une faible énergie de commande d'ouverture, le champ magnétique de soufflage de l'arc étant dérivé du courant à interrompre. Le noyau est formé par une partie métallique tubulaire en matériau ferromagnétique délimitant le conduit de circulation de gaz. Ce conduit présente une section circulaire et sert de logement à un organe d'absorption des produits de décomposition du gaz de soufflage. Cet organe est agencé entre deux grilles métalliques dans le but de purifier et de refroidir les gaz de soufflage. La présence de cet organe d'absorption dans le conduit s'oppose néanmoins à une circulation efficace du gaz dans le sens d'échappement avec formation éventuelle d'un bouchon gazeux ionisé dans la zone d'arc. La bobine est entourée coaxialement par une culasse tubulaire ferromagnétique prolongée par un déflecteur agencé autour de la zone d'extension de l'arc. Ce déflecteur protège l'enveloppe contre les effets de l'arc, mais s'oppose à une circulation du gaz par l'extérieur de l'ensemble de contact fixe. Il en résulte que le pouvoir de coupure d'un tel interrupteur est limité.A known switch of the kind mentioned (German patent application DE-A-2,511,238) requires low opening control energy, the magnetic arc blowing field being derived from the current to be interrupted. The core is formed by a tubular metal part made of ferromagnetic material delimiting the gas circulation duct. This duct has a circular section and serves as a housing for an organ for absorbing the products of decomposition of the blowing gas. This member is arranged between two metal grids for the purpose of purifying and cooling the blowing gases. The presence of this absorption member in the conduit nevertheless precludes an efficient circulation of the gas in the direction of exhaust with possible formation of an ionized gas plug in the arc zone. The coil is coaxially surrounded by a ferromagnetic tubular yoke extended by a deflector arranged around the extension zone of the arc. This deflector protects the envelope against the effects of the arc, but prevents gas from circulating outside the fixed contact assembly. As a result, the breaking capacity of such a switch is limited.

La présente invention a pour but de remédier à ces inconvénients et de permettre la réalisation d'un interrupteur à arc tournant performant.The object of the present invention is to remedy these drawbacks and to enable the production of an efficient rotating arc switch.

Selon l'invention, la zone d'extension de l'arc située à l'avant de l'ensemble de contact fixe communique librement avec la zone opposée postérieure à la fois par l'intérieur et par l'extérieur dudit ensemble, le premier trajet du gaz par l'intérieur s'effectuant à travers ledit conduit et le deuxième trajet par l'extérieur intervenant entre ledit ensemble de contact fixe et la paroi interne de l'enveloppe.According to the invention, the arc extension zone located at the front of the fixed contact assembly communicates freely with the opposite posterior zone both from the inside and from the outside of said assembly, the first path of the gas from the inside taking place through the said conduit and the second path from the outside intervening between the said fixed contact assembly and the internal wall of the envelope.

Des essais ont confirmé l'efficacité de ce dispositif qui peut s'expliquer par une évacuation facilitée des gaz ionisés de la zone de coupure, notamment de la zone centrale entourée par l'arc tournant. Il avait déjà été proposé de combiner le soufflage magnétique et le soufflage pneumatique de l'arc en engendrant dans un interrupteur à arc tournant un soufflage des gaz dans la zone de coupure soit par pistonnage des gaz, soit par auto-expansion vers un compartiment séparé d'expansion. Ces dispositifs sont compliqués et nécessitent des cloisonnements internes de l'enceinte et/ou des volumes pistonnables. Le soufflage pneumatique participe pour une part non négligeable et parfois prépondérante au soufflage de l'arc. La présente invention part d'une conception différente en ce sens qu'elle accroît, d'une part, le soufflage magnétique, c'est-à-dire la rotation de l'arc en prévoyant un noyau ferromagnétique à l'intérieur de la bobine, et qu'elle évite, d'autre part, toute zone de stagnation de gaz ionisés dans la zone centrale confinée par l'arc. Les gaz soumis à l'action de l'arc peuvent s'échapper librement de part et d'autre de l'arc vers des zones plus froides de l'enceinte dont le volume total est ainsi mis à contribution. Cette circulation de gaz n'exerce pas un soufflage de l'arc. Le noyau est de préférence connecté en série de la bobine de soufflage pour maintenir le soufflage magnétique lors d'une commutation de l'arc sur le noyau. Le conduit d'échappement peut être ménagé à l'intérieur du noyau de forme tubulaire ou entre la face interne de la bobine et la face externe d'un noyau plein d'un diamètre inférieur ou, bien entendu, par une combinaison de ces moyens. Le profil en long du conduit d'échappement est de préférence conformé en tuyère présentant un col auquel se raccorde, en amont, un convergent et, en aval, un divergent pour favoriser l'écoulement dans le sens d'échappement hors de la zone d'arc.Tests have confirmed the effectiveness of this device, which can be explained by an easier evacuation of ionized gases from the breaking zone, in particular from the central zone surrounded by the rotating arc. It had already been proposed to combine the magnetic blowing and the pneumatic blowing of the arc by generating in a rotating arc switch a blowing of the gases into the cut-off zone either by gas piston or by self-expansion towards a separate compartment. expansion. These devices are complicated and require internal partitions of the enclosure and / or pistonable volumes. Pneumatic blowing contributes to a significant and sometimes preponderant part in blowing the arc. The present invention starts from a different design in that it increases, on the one hand, the magnetic blowing, that is to say the rotation of the arc by providing a ferromagnetic core inside the coil, and that it avoids, on the other hand, any zone of stagnation of ionized gases in the central zone confined by the arc. The gases subjected to the action of the arc can escape freely on either side of the arc towards colder zones of the enclosure whose total volume is thus put to contribution. This gas flow does not blow the arc. The core is preferably connected in series with the blow coil to maintain the magnetic blow during a switching of the arc on the core. The exhaust duct can be formed inside the tubular core or between the internal face of the coil and the external face of a solid core of a smaller diameter or, of course, by a combination of these means . The longitudinal profile of the exhaust duct is preferably shaped as a nozzle having a neck to which is connected, upstream, a convergent and, downstream, a divergent to promote flow in the direction of exhaust out of the zone d 'bow.

Selon un développement de l'invention, la bobine de soufflage est entourée extérieurement d'une culasse de renforcement du champ magnétique, et l'électrode opposée présente des orifices de circulation de gaz.According to a development of the invention, the blowing coil is surrounded externally by a yoke for reinforcing the magnetic field, and the opposite electrode has gas circulation orifices.

L'invention sera décrite en détail par la suite comme étant appliquée à un interrupteur à contacts principaux séparés des contacts d'arc, mais il est clair qu'elle est applicable à tout autre type d'interrupteur à arc tournant, par exemple à contacts principaux coaxiaux aux contacts d'arc ou à contacts séparables constituant les pistes de rotation de l'arc.The invention will be described in detail below as being applied to a switch with main contacts separate from the arcing contacts, but it is clear that it is applicable to any other type of rotating arc switch, for example with contacts main coaxial with arcing contacts or separable contacts constituting the arc rotation tracks.

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre d'un mode de mise en oeuvre de l'invention, donné à titre d'exemple non limitatif et représenté aux dessins annexés, dans lesquels:

  • la fig. est une vue schématique en coupe axiale d'un interrupteur selon l'invention;
  • la fig. 2 est une vue partielle à échelle agrandie de l'ensemble de contact fixe selon ia fig. 1 ;
  • la fig. 3 est une vue analogue à celle de la fig. 2, illustrant une variante de réalisation.
Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment of the invention, given by way of nonlimiting example and represented in the appended drawings, in which:
  • fig. is a schematic view in axial section of a switch according to the invention;
  • fig. 2 is a partial view on an enlarged scale of the fixed contact assembly according to FIG. 1;
  • fig. 3 is a view similar to that of FIG. 2, illustrating an alternative embodiment.

Les figures montrent un interrupteur du type décrit dans la demande de brevet européen EP-A-0.053.524, et l'invention sera décrite ci-dessous comme étant appliquée à un interrupteur de ce type; mais il est clair qu'elle est applicable à d'autres interrupteurs à arc tournant, notamment décrits dans la demande de brevet français FR-A-2.464.550.The figures show a switch of the type described in European patent application EP-A-0.053.524, and the invention will be described below as being applied to a switch of this type; but it is clear that it is applicable to other rotary arc switches, in particular de described in French patent application FR-A-2,464,550.

Sur la fig. 1, analogue à celle de la demande de brevet européen EP-A-0.053.524, on reconnaît l'enveloppe étanche 10 confinant une enceinte 12 remplie d'un gaz à rigidité diélectrique élevée, tel que l'hexafluorure de soufre. Dans l'enceinte 12 sont disposés des contacts principaux 14, 16 et des contacts de shuntage 18, 20, dont les contacts mobiles 16, 20 sont actionnés par un mécanisme 22. L'enveloppe 10 contient de plus des contacts d'arc constitués par deux électrodes annulaires 24, 26, disposées face à face et tangentiellement à la trajectoire de pivotement de l'extrémité du contact mobile de shuntage 20. L'électrode annuaire 24 appartient à un ensemble fixe 28 comprenant une bobine annulaire 30 associée à la face arrière de l'électrode 24 et fixée à un support 32. On se reportera avantageusement à la demande de brevet européen précitée pour de plus amples détails concernant cet interrupteur, et il suffit de rappeler que, lors d'une manoeuvre d'ouverture, l'arc tiré entre les contacts de shuntage 18, 20 est commuté sur les électrodes 24, 26 en mettant en circuit la bobine de soufflage 30, imposant une rotation des racines d'arc sur les pistes annulaires formées par les électrodes 24, 26.In fig. 1, analogous to that of European patent application EP-A-0.053.524, the waterproof envelope 10 is recognized, confining an enclosure 12 filled with a gas with high dielectric strength, such as sulfur hexafluoride. In the enclosure 12 are arranged main contacts 14, 16 and shunt contacts 18, 20, the movable contacts 16, 20 of which are actuated by a mechanism 22. The casing 10 also contains arcing contacts constituted by two annular electrodes 24, 26, arranged face to face and tangential to the pivoting path of the end of the movable shunting contact 20. The directory electrode 24 belongs to a fixed assembly 28 comprising an annular coil 30 associated with the rear face of the electrode 24 and fixed to a support 32. Reference is advantageously made to the aforementioned European patent application for further details concerning this switch, and it suffices to recall that, during an opening operation, the arc drawn between the shunt contacts 18, 20 is switched on the electrodes 24, 26 by switching on the blowing coil 30, imposing a rotation of the arc roots on the annular tracks formed by the electrodes 24, 26.

En se référant plus particulièrement à la fig. 2, on voit qu'un noyau ferromagnétique 34 en forme d'olive est disposé à l'intérieur de la bobine 30, la face frontale ou extrémité 36 étant voisine de l'électrode annulaire 24. Le noyau 34 est monté à sa partie arrière sur une plaque de fixation 38 fixée par des goujons 40 au support 32 avec interposition de rondelles isolantes 42. Les goujons 40 traversent la bobine 30 et sont soudés à l'arrière de l'électrode annulaire 24. Un tel montage est décrit dans le brevet français FR-A-2.464.550 et permet d'isoler le noyau ferromagnétique 34 du support 32, de manière à maintenir en circuit la bobine de soufflage 30 en cas d'amorçage de l'arc sur le noyau 34. La bobine 30 est connectée entre le support 32 et l'électrode annulaire 24. Le diamètre du noyau 34 est inférieur au diamètre interne de la bobine 30, de manière à ménager un conduit annulaire 44 permettant un échappement de gaz à travers l'ensemble fixe 28. La forme en olive du noyau 34 définit une tuyère à entrée convergente 46 et à sortie divergente 48, facilitant un échappement des gaz hors de la zone d'arc adjacente à l'électrode annulaire 24. Un écoulement en sens inverse vers l'électrode annulaire 24 est par contre freiné. Une culasse 50 peut être disposée à l'extérieur de la bobine 30.With particular reference to FIG. 2, it can be seen that a ferromagnetic core 34 in the form of an olive is disposed inside the coil 30, the front face or end 36 being close to the annular electrode 24. The core 34 is mounted at its rear part on a fixing plate 38 fixed by studs 40 to the support 32 with interposition of insulating washers 42. The studs 40 pass through the coil 30 and are welded to the rear of the annular electrode 24. Such an assembly is described in the patent French FR-A-2,464,550 and allows the ferromagnetic core 34 to be isolated from the support 32, so as to keep the blowing coil 30 in circuit in the event of arcing on the core 34. The coil 30 is connected between the support 32 and the annular electrode 24. The diameter of the core 34 is less than the internal diameter of the coil 30, so as to provide an annular duct 44 allowing gas to escape through the fixed assembly 28. The shape in olive of the core 34 defines a nozzle with converging inlet 46 and at divergent line 48, facilitating an escape of gases from the arc zone adjacent to the annular electrode 24. A flow in opposite direction towards the annular electrode 24 is on the other hand braked. A cylinder head 50 can be placed outside the coil 30.

La présence du noyau 34 et éventuellement de la culasse 50 permet d'accroître l'intensité du champ magnétique de soufflage de l'arc ancré sur l'électrode annulaire 24 et de provoquer son extinction. Les gaz chauffés et ionisés par l'action de l'arc au voisinage de l'électrode annulaire 24 peuvent circuler librement vers l'extérieur et vers l'intérieur en s'échappant par le conduit constitué par l'intervalle 44. On évite ainsi toute stagnation de gaz ionisés dans la partie centrale de l'ensemble de contact fixe 28 susceptible d'entraver l'extinction de l'arc ou de provoquer des réamorçages. Cette circulation n'exerce aucun effet direct de soufflage sur l'arc lui-même et ne participe qu'indirectement à la coupure du courant. Le choix de la section du conduit d'échappement 44 et du noyau 34 résulte d'un compromis entre la nécessité de disposer d'une section de fer suffisante pour un renforcement du champ magnétique et d'une section suffisante d'échappement du gaz afin de ne pas trop freiner la circulation des gaz.The presence of the core 34 and possibly of the yoke 50 makes it possible to increase the intensity of the magnetic blowing field of the arc anchored on the annular electrode 24 and to cause its extinction. The gases heated and ionized by the action of the arc in the vicinity of the annular electrode 24 can circulate freely outwards and inwards, escaping through the conduit formed by the interval 44. This thus avoids any stagnation of ionized gases in the central part of the fixed contact assembly 28 capable of hindering the extinction of the arc or of causing re-strikes. This circulation has no direct blowing effect on the arc itself and only participates indirectly in cutting the current. The choice of the section of the exhaust duct 44 and of the core 34 results from a compromise between the need to have a section of iron sufficient for a reinforcement of the magnetic field and a section sufficient for the exhaust of the gas in order not to brake the gas circulation too much.

La fig. 3, analogue à la fig. 2, illustre une variante de réalisation de l'ensemble de contact fixe 28 dans laquelle un conduit d'échappement des gaz 52 est ménagé à l'intérieur d'un noyau creux 54. Le conduit 52 est agencé en forme de tuyère facilitant l'évacuation des gaz hors de la zone d'arc, et il est clair que le fonctionnement est absolument identique à celui décrit ci-dessus en référence à la fig. 2. L'évacuation à travers le noyau 54 peut être combinée une évacuation de la bobine, du type représenté à la fig. 2.Fig. 3, similar to FIG. 2 illustrates an alternative embodiment of the fixed contact assembly 28 in which a gas exhaust pipe 52 is formed inside a hollow core 54. The pipe 52 is arranged in the form of a nozzle facilitating the evacuation of gases out of the arc zone, and it is clear that the operation is absolutely identical to that described above with reference to FIG. 2. The evacuation through the core 54 can be combined with an evacuation of the coil, of the type shown in FIG. 2.

En se référant à la fig. 1, on voit que l'électrode annulaire 26 opposée à l'électrode 24 présente des orifices 56 permettant un échappement des gaz hors de la zone centrale confinée par l'arc tournant. Le dispositif de circulation de gaz selon l'invention peut, bien entendu, être appliqué à tout autre type d'interrupteur à arc tournant, par exemple du type décrit dans le brevet français FR-A-2.464.550, et l'invention n'est pas limitée au mode de mise en oeuvre plus particulièrement décrit, mais elle s'étend à un interrupteur dans lequel le noyau 34, 54 ne serait pas au même potentiel que l'électrode annulaire 24, ou celle encore dans laquelle la structure de l'ensemble de contact fixe serait différent. On remarque que le premier trajet du gaz par l'intérieur s'effectue à travers le conduit 44, 52, alors que le deuxième trajet par l'extérieur intervient entre l'ensemble de contact fixe 28 et la paroi latérale interne de l'enveloppe 10.Referring to fig. 1, it can be seen that the annular electrode 26 opposite the electrode 24 has orifices 56 allowing gases to escape from the central zone confined by the rotating arc. The gas circulation device according to the invention can, of course, be applied to any other type of rotary arc switch, for example of the type described in French patent FR-A-2,464,550, and the invention n is not limited to the embodiment more particularly described, but it extends to a switch in which the core 34, 54 is not at the same potential as the annular electrode 24, or that in which the structure of the fixed contact assembly would be different. It is noted that the first path of the gas from the inside takes place through the conduit 44, 52, while the second path from the outside takes place between the fixed contact assembly 28 and the internal lateral wall of the envelope. 10.

Claims (8)

1. Electric circuit breaker with self blow-out by rotation of the arc under the effect of a magnetic field generated by the current to be cut derroris- ing:
- a sealed chamber (10) filled with a gas of nigh dielectric strength,
- a stationary contact assembly (28), mounted freely inside sealed chamber (10),
- an annular electrode (24) pertaining to said stationary contact assembly (28) and forming an annular track for the rotation of the arc under the effect of a magnetic field generated by a tubular coil (30) fitted coaxially at the rear side of annular electrode (24),
- a ferromagnetic core (34, 54) extending coaxially inside the tubular coil (30) and presenting a terminal face (36) adjacent to said annular electrode (24),
- and a channel (44, 52) contrived in said stationary contact assembly (28) and passing through the tubular coil (30) and the annular electrode (24),

characterized by the fact that the arc expansion zone arranged at the front side of the stationary contact assembly (28), communicates freely with the opposite rear zone, both through and outside said assembly (28), the first trajectory of the gas, inside, passing through said channel (44, 52) and the second trajectory, outside, passing between said stationary contact assembly (28) and the inner wall of the chamber (10).
2. Circuit breaker according to claim 1, characterized in that said channel (52) extends coaxially through the hollow ferromagnetic core (54) and opens on both sides of said stationary contact assembly (28).
3. Circuit breaker according to claim 1, characterized in that said channel (44) of annular cross-section is confined between the outer surface of core (34) and the inner surface of the tubular coil (30), whose cross-section is larger than that of the core.
4. Circuit breaker according to claim 2 or 3, characterized in that said channel (44, 52) is in the form of a jet pipe with a contracting inlet and an expanding outlet, which facilitates the flow of the gas from the front side towards the rear zone of the stationary contact assembly (28).
5. Circuit breaker according to claim 1, 2, 3 or 4, characterized in that the core (34, 54) is electrically connected to said annular electrode (24) in order to maintain coil (30) energized in case of anchoring of the arc on the core.
6. Circuit breaker according to claim 1, 2, 3, 4 or 5, characterized in that it comprises a second annular electrode (26), said annular electrodes (24, 26) being placed in front of each other, said second electrode (26) having also a gas channel (56) passing through it.
7. Circuit breaker according to any one of the preceding claims, characterized in that main contacts (14, 16) placed coaxially and outside with respect to said tubular coil (30).
8. Circuit breaker according to any one of the preceding claims, characterized in that it comprises main contacts (14,16) placed laterally with respect to said tubular coil (30), the arc switching onto said annular electrode (24) on opening the circuit breaker.
EP83401612A 1982-08-10 1983-08-04 Electrical switch with rotating arc Expired EP0101371B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83401612T ATE18961T1 (en) 1982-08-10 1983-08-04 ELECTRIC SWITCH WITH ROTATING ARC.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8214032 1982-08-10
FR8214032A FR2531804B1 (en) 1982-08-10 1982-08-10 ELECTRIC SWITCH WITH ROTATING ARC

Publications (2)

Publication Number Publication Date
EP0101371A1 EP0101371A1 (en) 1984-02-22
EP0101371B1 true EP0101371B1 (en) 1986-04-02

Family

ID=9276822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401612A Expired EP0101371B1 (en) 1982-08-10 1983-08-04 Electrical switch with rotating arc

Country Status (9)

Country Link
US (1) US4532392A (en)
EP (1) EP0101371B1 (en)
JP (1) JPS5929315A (en)
AT (1) ATE18961T1 (en)
AU (1) AU559591B2 (en)
CA (1) CA1219025A (en)
DE (1) DE3362794D1 (en)
FR (1) FR2531804B1 (en)
IN (1) IN159740B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59144726U (en) * 1983-03-15 1984-09-27 日新電機株式会社 Gas cutter
US5464956A (en) * 1994-04-08 1995-11-07 S&C Electric Company Rotating arc interrupter for loadbreak switch

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB375309A (en) * 1931-03-18 1932-06-20 Electr & Allied Ind Res Ass Improvements relating to electric switches and circuit breakers
US3858015A (en) * 1972-09-15 1974-12-31 Gen Electric Electric circuit breaker of the gas blast type
JPS50121775A (en) * 1974-03-14 1975-09-23
DE2423104C2 (en) * 1974-05-13 1986-02-06 Brown, Boveri & Cie Ag, 6800 Mannheim Electric pressure gas switch
US4017954A (en) * 1975-09-22 1977-04-19 Amp Incorporated Tool for gang crimping ribbon coaxial cable
JPS53117767A (en) * 1977-03-24 1978-10-14 Mitsubishi Electric Corp Switch
CH641593A5 (en) * 1979-01-18 1984-02-29 Sprecher & Schuh Ag Gas-blast circuit breaker
FR2494493A1 (en) * 1980-11-17 1982-05-21 Merlin Gerin ELECTRIC CIRCUIT BREAKER WITH SELF-BLOWING BY ARC ROTATION

Also Published As

Publication number Publication date
AU1782183A (en) 1984-02-16
JPS5929315A (en) 1984-02-16
EP0101371A1 (en) 1984-02-22
FR2531804A1 (en) 1984-02-17
FR2531804B1 (en) 1985-06-07
AU559591B2 (en) 1987-03-12
IN159740B (en) 1987-06-06
CA1219025A (en) 1987-03-10
DE3362794D1 (en) 1986-05-07
US4532392A (en) 1985-07-30
ATE18961T1 (en) 1986-04-15

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