EP0401131A1 - Electrical switch with rotating arc - Google Patents

Electrical switch with rotating arc Download PDF

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Publication number
EP0401131A1
EP0401131A1 EP90420243A EP90420243A EP0401131A1 EP 0401131 A1 EP0401131 A1 EP 0401131A1 EP 90420243 A EP90420243 A EP 90420243A EP 90420243 A EP90420243 A EP 90420243A EP 0401131 A1 EP0401131 A1 EP 0401131A1
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EP
European Patent Office
Prior art keywords
contact
movable
crank
contacts
main
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Withdrawn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
EP90420243A
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German (de)
French (fr)
Inventor
Roger Bolongeat-Mobleu
Denis Raphard
Jean-Pierre Boyer
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.)
Merlin Gerin SA
Original Assignee
Merlin Gerin SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Merlin Gerin SA filed Critical Merlin Gerin SA
Publication of EP0401131A1 publication Critical patent/EP0401131A1/en
Withdrawn legal-status Critical Current

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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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/18—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H01H33/187—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet comprising a hollow annular arc runner and a central contact between which a radially drawn arc rotates

Definitions

  • the invention relates to an electric switch with self-blowing by rotation of the arc under the action of a magnetic field, having a sealed enclosure filled with a gas with high dielectric strength, in particular sulfur hexafluoride, in which are arranged a movable main contact pivotally mounted on a first fixed axis and cooperating with a fixed main contact and a movable arcing contact pivotally mounted on a second fixed axis parallel to said first fixed axis and cooperating with an electrode of revolution, disposed coaxially inside a coil, electrically connected in series with the arcing contacts in an arcing circuit connected in parallel with the main circuit which comprises said main contacts.
  • a gas with high dielectric strength in particular sulfur hexafluoride
  • An electric switch of the kind mentioned uses the energy of the arc to blow it and therefore requires relatively low control energy, limited to the mechanical force of displacement of the contacts.
  • the main contacts are protected by switching on the arcing circuit, this switching can be obtained either by arc migration, or by arcing contacts connected in parallel with the main contacts and opening after contact separation main.
  • the use of arcing contacts connected in parallel with the main contacts avoids any arcing or sparking on the latter during their separation, but requires perfect synchronization of the movements in order to avoid any premature opening of the arc or vice versa when closing the main contacts are closed beforehand.
  • To the problem of synchronization of movements is added that of the electro-dynamic repulsion forces exerted on the movable contacts through which the short-circuit currents require robust control mechanisms.
  • the present invention aims to allow the production of a switch with a simplified control mechanism capable of positioning and controlling the main contacts and the arcing contacts.
  • the switch according to the invention is characterized in that said electrode is in the form of a hollow cylinder inside which struggles said movable arcing contact between two extreme closing and opening positions, in which positions the contact d the movable arc is respectively in contact with the internal periphery of the electrode and substantially in the center of said electrode and that a mechanical connection connects the movable main contact and the movable arcing contact to cause the opening of the arcing contacts after that of the main contacts and the closing of the arcing contacts before that of the main contacts, said mechanical connection comprising an elastic element for supplying the contact pressure for closing the arcing contacts and a means for neutralizing the elastic element in position central opening of the movable arcing contact to create a rigid connection between the two movable contacts, said elastic element allowing movement for followed by closing the movable main contact after the movable arcing contact has come into the closed position, and vice versa, a prior movement for opening the movable main contact before the movable arcing contact has opened.
  • the main contacts and the arcing contacts are both closed, only a fraction of the current passing through the arcing circuit having a high impedance due inter alia to the blow coil inserted in this circuit. .
  • the movable arcing contact is maintained in contact with the cylindrical electrode constituting the fixed arcing contact with a sufficient contact pressure generated by the elastic element of the mechanical connection.
  • This elastic force of contacts prevents any untimely opening of the arcing contacts.
  • This elastic connection associated with a dead travel also allows the delayed opening of the arcing contacts during an opening movement of the main contacts and conversely a prior closing of the arcing contacts.
  • the elastic element In the open position the elastic element is neutralized and the movable arcing contact is rigidly coupled to the fixed contact. The movable arcing contact is thus positively maintained in the open position in the axis of the cylindrical electrode and it is capable of withstanding the electro-dynamic forces exerted on it.
  • the neutralization of the elastic element in the open position of the switch is carried out by a crank connecting rod system having a hinge mounted to slide in a light secured to the crank.
  • the fixed main contact carries the crank while the connecting rod is hinged to the movable arcing contact.
  • the elastic element is constituted by a spring urging the trunnion carried by the connecting rod and constituting the articulation of the crank connecting rod system at the bottom of the crank opening.
  • the crank and the connecting rod In the open position, the crank and the connecting rod extend perpendicularly and the forces exerted on the connecting rod are transmitted directly to the crank while remaining without effect on the elastic element.
  • the crank travel is close to 90 ° and the crank connecting rod system is substantially aligned in the open position of the switch.
  • the movable main contact is a knife pivotally mounted on a fixed axis carried by the end of a bushing and this knife cooperates with a pad or a fixed contact clamp secured to another bushing.
  • the movable arcing contact is a contact pad coming to bear on the internal surface of the cylindrical electrode.
  • the assembly is housed in a sealed envelope filled with sulfur hexafluoride, the arc circuit being offset with respect to the main circuit, the length of which is shorter.
  • the control mechanism disposed outside the envelope drives a control shaft sealingly passing through the wall of the envelope.
  • This control shaft carries a crank connected by a connecting rod to the movable main contact.
  • the movable main contact pivots in the opening direction by rotating the crank which, by the elongated light, introduces a dead travel to maintain the movable contact. arc in closed position.
  • the main contacts separate before the complete travel of the dead travel, causing a switching of the current on the arcing circuit.
  • This current flowing through the blowing coil generates a magnetic field, in particular an axial field inside the cylindrical electrode.
  • the movable arcing contact is positioned perfectly in the center of the cylindrical electrode whatever the electro-dynamic forces exerted on it.
  • a pole of an electrical circuit breaker in particular of medium voltage comprises a sealed envelope 10 made of an insulating material, filled with a gas with high dielectric strength, in particular sulfur hexafluoride under an appropriate pressure.
  • Bushings 12, 14 shaped as a current supply terminal pass through the wall of the casing 10, one of the bushings carrying a main fixed contact pad 16.
  • the other bushing 12 extends inside the envelope 10 by a support 18 of a fixed axis 20 of articulation of a movable main contact in the form of a knife 22, cooperating in the closed position with the fixed contact pad 16.
  • the knife 22 can be constituted by two blades contact subjected to the action of a spring and coming to grip a contact pad 16 or conversely the knife 22 can be a single blade coming to be inserted between contact clamps constituting the fixed contact pad 16.
  • the assembly of fixed contact pad 16, knife 22 and support 18 are substantially aligned and constitute a main circuit for the passage of current from one of the bushings to the other.
  • Parallel and laterally offset inside the casing 10 is arranged an arc circuit constituted by a coil 24, a cylindrical electrode 26, a movable arcing contact 28 and a support arm 30.
  • the support arm 30 integral with the bushing 12 carries a hinge pin 32 of the movable arcing contact 28 and the coil 24 is electrically connected to the opposite bushing 14.
  • the movable arcing contact 28 comprises a contact pad 34 in the form of a cylindrical wafer coming into the closed position in contact with the internal surface 36 of the cylindrical electrode 26.
  • the articulation axis 32 of the arcing contact is disposed on the axis 38 of the cylindrical electrode 26. and this axis 32 s 'extends parallel to the axis 20 of articulation of the knife 22.
  • the movable arcing contact 28 is extended beyond the axis 32 by an arm 40 to which a connecting rod 42 is articulated, the opposite end of which carries a pin 44 slidably mounted in a slot 46 formed at the end d 'a crank 48 integral with the knife 22.
  • the pin 44 In the position closure shown in Figure 1 the pin 44 is in an intermediate compression position of the spring 50 the latter exerting via the connecting rod 42 and the arm 40 a bearing force of the contact pad 34 against the cylindrical surface 36 .
  • a rotary control shaft 52 sealingly traverses the wall of the casing 10 and its outer end is connected to a control mechanism, not shown.
  • the inner end of the control shaft 52 carries a crank 54 connected by a hinge 56 to a control rod 58, articulated at its opposite end 60 to the knife 22.
  • the toggle joint constituted by the crank 54 and the connecting rod 58 is in an extension position for holding the knife 22 in the closed position and that a rotation of the shaft 52 in the counterclockwise direction a watch causes a displacement towards the open position of the knife 22 which pivots clockwise on the axis 20.
  • the closing of the switch is controlled by a reverse rotation of the control shaft 52 in a manner well known to specialists.
  • the switch according to the invention operates as follows:
  • the closing of the switch is generated by a reverse rotation of the control shaft 52, which causes the pivoting in the clockwise direction of the crank 54 and through the control rod 58 a pivoting anti-clockwise of the knife 22.
  • the crank 48 pivots with the knife 22 around the fixed axis 20 and this movement is transmitted by the connecting rod 42 to the movable arc contact 28 which pivots in the direction counterclockwise around fixed axis 32.
  • the contact pad 34 bears against the internal surface 36 of the annular electrode 26 which prevents further movement of this contact 34.
  • this intermediate position which corresponds to that illustrated in FIG. 3, the main contacts 22 16 are still separated and closing is effected by the arc circuit.
  • the elastic connection due to the lumen 46 and to the spring 50 allows continued pivoting of the knife 22, the pin 44 sliding in the lumen 46 until the knife 22 comes into the closed position shown in FIG. 1.
  • the spring 50 provides the contact pressure of the arcing contacts 26 34.
  • the mechanism is particularly simple and it ensures synchronism and the succession of opening and closing of the contacts, necessary for the protection of the main contacts 16, 22. This mechanism similarly ensures the closing contact pressure as well as the maintenance or locking of the movable arcing contact 28 in the open position at the center of the cylindrical electrode. In this open position, the arc drawn during the separation of the arcing contacts 26, 34 extends radially inside the cylindrical electrode 26 and it is subjected to the axial magnetic field generated by the current flowing through the coil 24.
  • the arrangement according to the invention of the arcing contacts in parallel and with a lateral offset inside the casing 10, with respect to the main contacts 16, 22, allows a clear separation of the functions and avoids any interference liable to cause re-strikes or strikes on the main contacts 16, 22.
  • the radial arrangement of the arc inside the cylindrical electrode 26 limits the risks of migration and the length of the arc can correspond to the optimal extinction length .
  • the use of an arc contact 34 in the form of a wafer allows symmetry and a conformation favorable to the blowing and the interruption of the arc.

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  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

An electric medium-voltage switch comprises contacts (16, 22) actuated by a connecting-rod/crank system (54, 58). An arc circuit comprising a cylindrical electrode (26) arranged inside a coil (24) and whose inside surface cooperates with a moving arc contact (34) is arranged parallel to the main contacts (16, 22). The mechanical link connecting the main contact (22) to the arc contact (34) comprises a crank (48)/connecting rod (42) system comprising an elastic element consisting of a slot (46) and a spring (50) making it possible to provide the contact pressure for the arc contacts. In the open position of the switch the connecting-rod (42) extends perpendicular to the crank (48), and the elastic element is neutralised in such a way as to maintain the moving arc contact (34) without play in the open position despite the electrodynamic forces acting on it. <IMAGE>

Description

L'invention est relative à un interrupteur électrique à auto­soufflage par rotation de l'arc sous l'action d'un champ magnétique, ayant une enceinte étanche remplie d'un gaz à rigidité diélectrique élevée, notamment d'hexafluorure de soufre,dans laquelle sont disposés un contact principal mobile monté à pivotement sur un premier axe fixe et coopérant avec un contact principal fixe et un contact d'arc mobile monté à pivotement sur un deuxième axe fixe parallèle audit premier axe fixe et coopérant avec une électrode de révolution, disposée coaxialement à l'intérieur d'une bobine, connectée électri­quement en série des contacts d'arc dans un circuit d'arc connecté en parallèle du circuit principal qui comprend lesdits contacts principaux.The invention relates to an electric switch with self-blowing by rotation of the arc under the action of a magnetic field, having a sealed enclosure filled with a gas with high dielectric strength, in particular sulfur hexafluoride, in which are arranged a movable main contact pivotally mounted on a first fixed axis and cooperating with a fixed main contact and a movable arcing contact pivotally mounted on a second fixed axis parallel to said first fixed axis and cooperating with an electrode of revolution, disposed coaxially inside a coil, electrically connected in series with the arcing contacts in an arcing circuit connected in parallel with the main circuit which comprises said main contacts.

Un interrupteur électrique du genre mentionné utilise l'énergie de l'arc pour le souffler et nécessite de ce fait une énergie de commande relativement faible, se limitant à la force mécanique de déplacement des contacts. Les contacts principaux sont protégés par la commutation sur le circuit d'arc, cette commu­tation pouvant être obtenue soit par migration de l'arc, soit par des contacts d'arc connectés en parallèle des contacts principaux et s'ouvrant après la séparation des contacts principaux. L'emploi de contacts d'arc connectés en parallèle des contacts principaux évite toute formation d'arc ou d'étincelle sur ces derniers lors de leur séparation, mais nécessite une parfaite synchronisation des mouvements afin d'éviter toute ouverture prématurée des contacts d'arc ou inversement à la fermeture une fermeture préalable des contacts principaux. Au problème de synchronisation des mouvements s'ajoute celui des efforts électro-dynamiques de répulsion s'exerçant sur les contacts mobiles traversés par les courants de court-circuit nécessitant des mécanismes de commande robustes.An electric switch of the kind mentioned uses the energy of the arc to blow it and therefore requires relatively low control energy, limited to the mechanical force of displacement of the contacts. The main contacts are protected by switching on the arcing circuit, this switching can be obtained either by arc migration, or by arcing contacts connected in parallel with the main contacts and opening after contact separation main. The use of arcing contacts connected in parallel with the main contacts avoids any arcing or sparking on the latter during their separation, but requires perfect synchronization of the movements in order to avoid any premature opening of the arc or vice versa when closing the main contacts are closed beforehand. To the problem of synchronization of movements is added that of the electro-dynamic repulsion forces exerted on the movable contacts through which the short-circuit currents require robust control mechanisms.

La présente invention a pour but de permettre la réalisation d'un interrupteur à mécanisme de commande simplifié capable de positionner et de commander les contacts principaux et les contacts d'arc.The present invention aims to allow the production of a switch with a simplified control mechanism capable of positioning and controlling the main contacts and the arcing contacts.

L'interrupteur selon l'invention est caractérisé en ce que ladite électrode est en forme de cylindre creux à l'intérieur duquel se débat ledit contact d'arc mobile entre deux positions extrêmes de fermeture et d'ouverture, dans lesquelles positions le contact d'arc mobile est respectivement au contact du pourtour interne de l'électrode et sensiblement au centre de ladite électrode et qu'une liaison mécanique relie le contact principal mobile et le contact d'arc mobile pour provoquer l'ouverture des contacts d'arc après celle des contacts principaux et la fermeture des contacts d'arc avant celle des contacts principaux, ladite liaison mécanique comprenant un élément élastique pour fournir la pression de contact de fermeture des contacts d'arc et un moyen de neutralisation de l'élément élastique en position centrale d'ouverture du contact d'arc mobile pour créer une liaison rigide entre les deux contacts mobiles, ledit élément élastique permettant un mouvement poursuivi de fermeture du contact principal mobile après la venue en position de fermeture du contact d'arc mobile et inversement un mouvement préalable d'ouverture du contact principal mobile avant l'ouverture du contact d'arc mobile.The switch according to the invention is characterized in that said electrode is in the form of a hollow cylinder inside which struggles said movable arcing contact between two extreme closing and opening positions, in which positions the contact d the movable arc is respectively in contact with the internal periphery of the electrode and substantially in the center of said electrode and that a mechanical connection connects the movable main contact and the movable arcing contact to cause the opening of the arcing contacts after that of the main contacts and the closing of the arcing contacts before that of the main contacts, said mechanical connection comprising an elastic element for supplying the contact pressure for closing the arcing contacts and a means for neutralizing the elastic element in position central opening of the movable arcing contact to create a rigid connection between the two movable contacts, said elastic element allowing movement for followed by closing the movable main contact after the movable arcing contact has come into the closed position, and vice versa, a prior movement for opening the movable main contact before the movable arcing contact has opened.

En position de fermeture de l'interrupteur, les contacts principaux et les contacts d'arc sont tous deux fermés, seule une fraction du courant empruntant le circuit d'arc ayant une impédance élevée due entre autres à la bobine de soufflage insérée dans ce circuit. Le contact d'arc mobile est maintenu en appui de l'électrode cylindrique constituant le contact d'arc fixe avec une pression de contact suffisante engendrée par l'élément élastique de la liaison mécanique.In the switch closed position, the main contacts and the arcing contacts are both closed, only a fraction of the current passing through the arcing circuit having a high impedance due inter alia to the blow coil inserted in this circuit. . The movable arcing contact is maintained in contact with the cylindrical electrode constituting the fixed arcing contact with a sufficient contact pressure generated by the elastic element of the mechanical connection.

Cette force élastique de contacts évite toute ouverture intempestiv des contacts d'arc. Cette liaison élastique associée à une course morte permet d'autre part l'ouverture retardée des contacts d'arc lors d'un mouvement d'ouverture des contacts principaux et inversement une fermeture préalable des contacts d'arc. En position d'ouverture l'élément élastique est neutralisé et le contact d'arc mobile est rigidement accouplé au contact fixe. Le contact d'arc mobile est ainsi maintenu positivement dans la position d'ouverture dans l'axe de l'électrode cylindrique et il est capable de résister aux efforts électro-dynamiques s'exerçant sur lui.This elastic force of contacts prevents any untimely opening of the arcing contacts. This elastic connection associated with a dead travel also allows the delayed opening of the arcing contacts during an opening movement of the main contacts and conversely a prior closing of the arcing contacts. In the open position the elastic element is neutralized and the movable arcing contact is rigidly coupled to the fixed contact. The movable arcing contact is thus positively maintained in the open position in the axis of the cylindrical electrode and it is capable of withstanding the electro-dynamic forces exerted on it.

La neutralisation de l'élément élastique en position d'ouverture de l'interrupteur est réalisée par un système bielle manivelle ayant une articulation montée à coulissement dans une lumière solidaire de la manivelle. Le contact principal fixe porte la manivelle tandis que la bielle est articulée au contact mobile d'arc. L'élément élastique est constitué par un ressort sollicitant le tourillon porté par la bielle et constituant l'articulation du système bielle manivelle au fond de la lumière de la manivelle. En position d'ouverture la manivelle et la bielle s'étendent perpendiculairement et les efforts exercés sur la bielle sont transmis directement à la manivelle en restant sans effet sur l'élément élastique. Le débattement de la manivelle est voisin de 90° et le système bielle manivelle est sensiblement aligné en position d'ouverture de l'interrupteur. Le contact principal mobile est un couteau monté à pivotement sur un axe fixe porté par l'extrémité d'une traversée et ce couteau coopére avec une plage ou une pince de contact fixe solidaire d'une autre traversée. Le contact d'arc mobile est un plot de contact venant en appui de la surface interne de l'électrode cylindrique. L'ensemble est logé dans une enveloppe étanche remplie d'hexafluorure de soufre le circuit d'arc étant décalé par rapport au circuit principal dont la longueur est plus faible.The neutralization of the elastic element in the open position of the switch is carried out by a crank connecting rod system having a hinge mounted to slide in a light secured to the crank. The fixed main contact carries the crank while the connecting rod is hinged to the movable arcing contact. The elastic element is constituted by a spring urging the trunnion carried by the connecting rod and constituting the articulation of the crank connecting rod system at the bottom of the crank opening. In the open position, the crank and the connecting rod extend perpendicularly and the forces exerted on the connecting rod are transmitted directly to the crank while remaining without effect on the elastic element. The crank travel is close to 90 ° and the crank connecting rod system is substantially aligned in the open position of the switch. The movable main contact is a knife pivotally mounted on a fixed axis carried by the end of a bushing and this knife cooperates with a pad or a fixed contact clamp secured to another bushing. The movable arcing contact is a contact pad coming to bear on the internal surface of the cylindrical electrode. The assembly is housed in a sealed envelope filled with sulfur hexafluoride, the arc circuit being offset with respect to the main circuit, the length of which is shorter.

Le mécanisme de commande disposé à l'extérieur de l'enveloppe entraîne un arbre de commande traversant d'une manière étanche la paroi de l'enveloppe. Cet arbre de commande porte une manivelle reliée par une bielle au contact principal mobile. Lors d'un mouvement d'ouverture commandé par la rotation de l'arbre de commande le contact principal mobile pivote en direction d'ouverture en entraînant en rotation la manivelle qui par la lumière allongée introduit une course morte de maintien du contact mobile d'arc en position de fermeture. Les contacts principaux se séparent avant le parcours complet de la course morte en provoquant une commutation du courant sur le circuit d'arc. Ce courant parcourant la bobine de soufflage engendre un champ magnétique notamment un champ axial à l'intérieur de l'électrode cylindrique. Un mouvement poursuivi du contact principal mobile provoque après épuisement de la course morte le pivotement du contact d'arc mobile vers la position centrale d'ouverture avec formation d'un arc s'étendant radialement à l'intérieur de l'électrode cylindrique. Cet arc est soumis à un soufflage magnétique en rotation provoquant son extinction rapide.The control mechanism disposed outside the envelope drives a control shaft sealingly passing through the wall of the envelope. This control shaft carries a crank connected by a connecting rod to the movable main contact. During an opening movement controlled by the rotation of the control shaft, the movable main contact pivots in the opening direction by rotating the crank which, by the elongated light, introduces a dead travel to maintain the movable contact. arc in closed position. The main contacts separate before the complete travel of the dead travel, causing a switching of the current on the arcing circuit. This current flowing through the blowing coil generates a magnetic field, in particular an axial field inside the cylindrical electrode. Continued movement of the movable main contact causes after exhaustion of the dead stroke the pivoting of the movable arcing contact towards the central opening position with the formation of an arc extending radially inside the cylindrical electrode. This arc is subjected to a magnetic blowing in rotation causing its rapid extinction.

Le contact d'arc mobile est positionné parfaitement au centre de l'électrode cylindrique quelque soit les efforts électro-dynamiques s'exerçant sur lui.The movable arcing contact is positioned perfectly in the center of the cylindrical electrode whatever the electro-dynamic forces exerted on it.

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 figure 1 est une coupe longitudinale suivant la ligne I-I de la figure 2 d'un interrupteur selon l'invention représenté en position fermée;
  • - la figure 2 est une coupe suivant la ligne II-II de la figure 1 ;
  • - Les figures 3 et 4 sont des vues partielles analogues à celle de la figure 1 montrant l'interrupteur respectivement en cours d'ouverture et en position ouvert.
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:
  • - Figure 1 is a longitudinal section along line II of Figure 2 of a switch according to the invention shown in the closed position;
  • - Figure 2 is a section along line II-II of Figure 1;
  • - Figures 3 and 4 are partial views similar to that of Figure 1 showing the switch respectively during opening and in the open position.

Sur les figures un pôle d'un disjoncteur électrique notamment de moyenne tension comporte une enveloppe étanche 10 en un matériau isolant, remplie d'un gaz à rigidité diélectrique élevée, notamment de l'hexafluorure de soufre sous une pression appropriée. Des traversées 12, 14 conformées en borne d'amenée de courant traversent la paroi de l'enveloppe 10, l'une 14 des traversées portant une plage de contact fixe principal 16. L'autre traversée 12 se prolonge à l'intérieur de l'enveloppe 10 par un support 18 d'un axe fixe 20 d'articulation d'un contact principal mobile en forme de couteau 22, coopérant en position de fermeture avec la plage de contact fixe 16. Le couteau 22 peut être constitué par deux lames de contact soumises à l'action d'un ressort et venant enserrer une plage de contact 16 ou inversement le couteau 22 peut être une lame unique venant s'insérer entre des pinces de contact constituant la plage de contact fixe 16. En position de fermeture de l'interrupteur l'ensemble plage de contact fixe 16, couteau 22 et support 18 sont sensiblement alignés et constituent un circuit principal de passage du courant de l'une des traversées vers l'autre. Parallèlement et décalé latéralement à l'intérieur de l'enveloppe 10 est disposé un circuit d'arc constitué par une bobine 24, une électrode cylindrique 26, un contact d'arc mobile 28 et un bras de support 30. Le bras de support 30 solidaire de la traversée 12 porte un axe d'articulation 32 du contact d'arc mobile 28 et la bobine 24 est connectée électriquement à la traversée opposée 14. Le contact mobile d'arc 28 comprend un plot de contact 34 en forme de galette cylindrique venant en position de fermeture au contact de la surface interne 36 de l'électrode cylindrique 26. L'axe d'articulation 32 du contact d'arc est disposé sur l'axe 38 de l'électrode cylindrique 26. et cet axe 32 s'étend parallèlement à l'axe 20 d'articulation du couteau 22.In the figures, a pole of an electrical circuit breaker in particular of medium voltage comprises a sealed envelope 10 made of an insulating material, filled with a gas with high dielectric strength, in particular sulfur hexafluoride under an appropriate pressure. Bushings 12, 14 shaped as a current supply terminal pass through the wall of the casing 10, one of the bushings carrying a main fixed contact pad 16. The other bushing 12 extends inside the envelope 10 by a support 18 of a fixed axis 20 of articulation of a movable main contact in the form of a knife 22, cooperating in the closed position with the fixed contact pad 16. The knife 22 can be constituted by two blades contact subjected to the action of a spring and coming to grip a contact pad 16 or conversely the knife 22 can be a single blade coming to be inserted between contact clamps constituting the fixed contact pad 16. In the closed position of the switch, the assembly of fixed contact pad 16, knife 22 and support 18 are substantially aligned and constitute a main circuit for the passage of current from one of the bushings to the other. Parallel and laterally offset inside the casing 10 is arranged an arc circuit constituted by a coil 24, a cylindrical electrode 26, a movable arcing contact 28 and a support arm 30. The support arm 30 integral with the bushing 12 carries a hinge pin 32 of the movable arcing contact 28 and the coil 24 is electrically connected to the opposite bushing 14. The movable arcing contact 28 comprises a contact pad 34 in the form of a cylindrical wafer coming into the closed position in contact with the internal surface 36 of the cylindrical electrode 26. The articulation axis 32 of the arcing contact is disposed on the axis 38 of the cylindrical electrode 26. and this axis 32 s 'extends parallel to the axis 20 of articulation of the knife 22.

Le contact d'arc mobile 28 est prolongé au-delà de l'axe 32 par un bras 40 auquel est articulée une bielle 42, dont l'extrémité opposée porte un tourillon 44 monté à coulissement dans une lumière 46 ménagée à l'extrémité d'une manivelle 48 solidaire du couteau 22. Un ressort 50 intercalé entre l'axe d'articulation 20 du couteau 22 et le tourillon 44 sollicite ce dernier vers le fond de la lumière 46 en position écartée de l'axe 20. Dans la position de fermeture représentée sur la figure 1 le tourillon 44 est dans une position intermédiaire de compression du ressort 50 ce dernier exerçant par l'intermédiaire de la bielle 42 et du bras 40 une force d'appui du plot de contact 34 contre la surface cylindrique 36.The movable arcing contact 28 is extended beyond the axis 32 by an arm 40 to which a connecting rod 42 is articulated, the opposite end of which carries a pin 44 slidably mounted in a slot 46 formed at the end d 'a crank 48 integral with the knife 22. A spring 50 interposed between the articulation axis 20 of the knife 22 and the pin 44 biases the latter towards the bottom of the light 46 in position spaced from the axis 20. In the position closure shown in Figure 1 the pin 44 is in an intermediate compression position of the spring 50 the latter exerting via the connecting rod 42 and the arm 40 a bearing force of the contact pad 34 against the cylindrical surface 36 .

Un arbre rotatif de commande 52 traverse d'une manière étanche la paroi de l'enveloppe 10 et son extrémité extérieure est reliée à un mécanisme de commande non représenté. L'extrémité intérieure de l'arbre de commande 52 porte une manivelle 54 reliée par une articulation 56 à une bielle de commande 58, articulée à son extrémité opposée 60 au couteau 22. Il est facile de voir que dans la position de fermeture, représentée sur la figure 1, la genouillère constituée par la manivelle 54 et la bielle 58 est dans une position d'extension de maintien du couteau 22 en position de fermeture et qu'une rotation de l'arbre 52 dans le sens inverse de aiguilles d'une montre provoque un déplacement vers la position d'ouverture du couteau 22 qui pivote dans le sens des aiguilles d'une montre sur l'axe 20. La fermeture de l'interrupteur est commandée par une rotation inverse de l'arbre de commande 52 d'une manière bien connue des spécialistes.A rotary control shaft 52 sealingly traverses the wall of the casing 10 and its outer end is connected to a control mechanism, not shown. The inner end of the control shaft 52 carries a crank 54 connected by a hinge 56 to a control rod 58, articulated at its opposite end 60 to the knife 22. It is easy to see that in the closed position, shown in FIG. 1, the toggle joint constituted by the crank 54 and the connecting rod 58 is in an extension position for holding the knife 22 in the closed position and that a rotation of the shaft 52 in the counterclockwise direction a watch causes a displacement towards the open position of the knife 22 which pivots clockwise on the axis 20. The closing of the switch is controlled by a reverse rotation of the control shaft 52 in a manner well known to specialists.

L'interrupteur selon l'invention fonctionne de la manière suivante :The switch according to the invention operates as follows:

En position de fermeture représentée sur la figure 1, les contacts principaux 16, 22 et les contacts d'arc 26, 34 sont fermés la quasi totalité du courant parcourant le circuit principal d'une moindre inductance constitué par les contacts principaux 16, 22. Le courant parcourant le circuit d'arc notamment la bobine 24 est extrêmement faible. Une manoeuvre d'ouverture est engagée par rotation de l'arbre de commande 52 dans le sens inverse des aiguilles d'une mont provoquant un pivotement du couteau 22 dans le sens des aiguilles d'une montre. La manivelle 48 accompagne le couteau 22 dans son pivotement et dans un premier temps le ressort 50 repousse le tourillon 44 vers le fond de la lumière 46, la bielle 42 restant dans sa position initiale. Après parcours de la course morte constituée par la lumière 46 le tourillon 44 vient en fond de lumière (voir figure 3) et le pivotement poursuivi de la manivelle 48 provoque l'entraînement du tourillon 44 et un déplacement vers la gauche sur la figure 3 de la bielle 42. Ce mouvement est transmis au bras 40 qui provoque le pivotement du contact d'arc 28 qui en position finale d'ouverture, représentée sur la figure 4, vient en alignement axial de l'électrode cylindrique 26. Dans cette position d'ouverture la bielle 42 est perpendiculaire à la manivelle 48 et le tourillon 44 est sollicité par le ressort 50 en fond de lumière. Il est facile de voir que toute tentative de pivotement du contact d'arc mobile 28 est transmise à la bielle 42 qui est maintenue par la manivelle 48. La liaison élastique constituée par le ressort 50 est neutralisée par la position perpendiculaire bielle 42 manivelle 48. Les positions du contact principal mobile 22 et du contact d'arc mobile 34 sont parfaitement définies et la chaîne cinématique de commande est capable de s'opposer aux forces importantes de répulsion s'exerçant sur les contacts.In the closed position shown in FIG. 1, the main contacts 16, 22 and the arcing contacts 26, 34 are closed almost all of the current flowing through the main circuit of less inductance constituted by the main contacts 16, 22. The current flowing through the arc circuit, in particular the coil 24, is extremely low. An opening operation is initiated by rotation of the control shaft 52 in the counterclockwise direction of a mount causing the knife 22 to pivot in the clockwise direction. The crank 48 accompanies the knife 22 in its pivoting and initially the spring 50 pushes the pin 44 towards the bottom of the light 46, the connecting rod 42 remaining in its initial position. After travel of the dead race constituted by the light 46 the pin 44 comes into the light background (see FIG. 3) and the continued pivoting of the crank 48 causes the pin 44 to be driven and a movement to the left in FIG. 3 of the rod 42. This movement is transmitted to the arm 40 which causes the pivoting of the arcing contact 28 which in the final open position, shown in FIG. 4, comes into axial alignment with the cylindrical electrode 26. In this position d opening the connecting rod 42 is perpendicular to the crank 48 and the pin 44 is biased by the spring 50 at the bottom of the light. It is easy to see that any attempt to pivot the movable arcing contact 28 is transmitted to the connecting rod 42 which is held by the crank 48. The elastic connection formed by the spring 50 is neutralized by the perpendicular position connecting rod 42 crank 48. The positions of the movable main contact 22 and of the movable arcing contact 34 are perfectly defined and the drive kinematic chain is capable of opposing the significant repulsive forces exerted on the contacts.

La fermeture de l'interrupteur est engendrée par une rotation inverse de l'arbre de commande 52, qui provoque le pivotement dans le sens des aiguilles d'une montre de la manivelle 54 et par l'intermédiaire de la bielle de commande 58 un pivotement dans le sens inverse des aiguilles d'une montre du couteau 22. La manivelle 48 pivote avec le couteau 22 autour de l'axe fixe 20 et ce mouvement est transmis par la bielle 42 au contact d'arc mobile 28 qui pivote dans le sens inverse des aiguilles d'une montre autour de l'axe fixe 32. Après une course pré-déterminée le plot de contact 34 vient en appui de la surface interne 36 de l'électrode annulaire 26 qui empêche une poursuite du déplacement de ce contact 34. Dans cette position intermédiaire, qui correspond à celle illustrée par la figure 3, les contacts principaux 22 16 sont encore séparés et la fermeture s'effectue par le circuit d'arc. La liaison élastique due à la lumière 46 et au ressort 50 autorise un pivotement poursuivi du couteau 22, le tourillon 44 coulissant dans la lumière 46 jusqu'à la venue du couteau 22 en position de fermeture représentée sur la figure 1. On voit que le ressort 50 fournit la pression de contact des contacts d'arc 26 34. Le mécanisme est particulièrement simple et il assure le synchro­nisme et la succession d'ouverture et de fermeture des contacts, nécessaire à la protection des contacts principaux 16, 22. Ce mécanisme assure de même la pression de contact de fermeture ainsi que le maintien ou le verrouillage du contact mobile d'arc 28 dans la position d'ouverture au centre de l'électrode cylindrique. Dans cette position d'ouverture l'arc tiré lors de la séparation des contacts d'arc 26, 34 s'étend radialement à l'intérieur de l'électrode cylindrique 26 et il est soumis au champ magnétique axial engendré par le courant parcourant la bobine 24. Sous l'action de ce champ l'arc est soumis à une rotation favorable à son extinction. La disposition selon l'invention des contacts d'arc parallèlement et avec un décalage latéral à l'intérieur de l'enveloppe 10, par rapport aux contacts principaux 16,22,permet une nette séparation des fonctions et évite toute interférence susceptible de provoquer des réamorçages ou des amorçages sur les contacts principaux 16, 22. La disposition radiale de l'arc à l'intérieur de l'électrode cylindrique 26 limite les risques de migration et la longueur de l'arc peut correspondre à la longueur optimale d'extinction. L'emploi d'un contact d'arc 34 en forme de galette permet une symétrie et une conformation favorable au soufflage et à l'inter­ruption de l'arc.The closing of the switch is generated by a reverse rotation of the control shaft 52, which causes the pivoting in the clockwise direction of the crank 54 and through the control rod 58 a pivoting anti-clockwise of the knife 22. The crank 48 pivots with the knife 22 around the fixed axis 20 and this movement is transmitted by the connecting rod 42 to the movable arc contact 28 which pivots in the direction counterclockwise around fixed axis 32. After a pre-determined run the contact pad 34 bears against the internal surface 36 of the annular electrode 26 which prevents further movement of this contact 34. In this intermediate position, which corresponds to that illustrated in FIG. 3, the main contacts 22 16 are still separated and closing is effected by the arc circuit. The elastic connection due to the lumen 46 and to the spring 50 allows continued pivoting of the knife 22, the pin 44 sliding in the lumen 46 until the knife 22 comes into the closed position shown in FIG. 1. It can be seen that the spring 50 provides the contact pressure of the arcing contacts 26 34. The mechanism is particularly simple and it ensures synchronism and the succession of opening and closing of the contacts, necessary for the protection of the main contacts 16, 22. This mechanism similarly ensures the closing contact pressure as well as the maintenance or locking of the movable arcing contact 28 in the open position at the center of the cylindrical electrode. In this open position, the arc drawn during the separation of the arcing contacts 26, 34 extends radially inside the cylindrical electrode 26 and it is subjected to the axial magnetic field generated by the current flowing through the coil 24. Under the action of this field the arc is subjected to a rotation favorable to its extinction. The arrangement according to the invention of the arcing contacts in parallel and with a lateral offset inside the casing 10, with respect to the main contacts 16, 22, allows a clear separation of the functions and avoids any interference liable to cause re-strikes or strikes on the main contacts 16, 22. The radial arrangement of the arc inside the cylindrical electrode 26 limits the risks of migration and the length of the arc can correspond to the optimal extinction length . The use of an arc contact 34 in the form of a wafer allows symmetry and a conformation favorable to the blowing and the interruption of the arc.

Claims (10)

1. Interrupteur électrique à auto-soufflage par rotation de l'arc sous l'action d'un champ magnétique, ayant une enceinte étanche (10) remplie d'un gaz à rigidité diélectrique élevée, notamment d'hexafluorure de soufre dans laquelle sont disposés un contact principal mobile (22) monté à pivotement sur un premier axe (20) fixe et coopérant avec un contact principal fixe (16) et un contact d'arc mobile (28) monté à pivotement sur un deuxième axe (32) fixe parallèle audit premier axe (20) fixe et coopérant avec une électrode (26) de révolution, disposée coaxialement à l'intérieur d'une bobine (24), connectée électriquement en série des contacts d'arc (26, 28) dans un circuit d'arc connecté en parallèle du circuit principal qui comprend lesdits contacts principaux (16, 22), caractérisé en ce que ladite électrode (26) est en forme de cylindre creux à l'intérieur duquel se débat ledit contact d'arc (28) mobile entre deux positions extrêmes de fermeture et d'ouverture, dans lesquelles positions le contact d'arc (28) mobile est respectivement au contact du pourtour interne de l'électrode cylindrique (26) et sensiblement au centre de ladite électrode et qu'une liaison mécanique (40, 42, 46, 48, 50) relie le contact principal (22) mobile et le contact d'arc (28) mobile pour provoquer l'ouverture des contacts d'arc (26, 28) après celle des contacts principaux (16, 22) et la fermeture des contacts d'arc (26, 28) avant celle des contacts principaux (16, 22) ladite liaison mécanique comprenant un élément élastique (50) pour fournir la pression de contact de fermeture des contacts d'arc (26, 28) et un moyen de neutralisation (44, 46) de l'élément élastique en position centrale d'ouverture du contact d'arc (28) mobile pour créer une liaison rigide entre les deux contacts mobiles (22, 28), ledit élément élastique (50) permettant un mouvement poursuivi de fermeture du contact principal (22) mobile après la venue en position de fermeture du contact d'arc mobile et inversement un mouvement préalable d'ouverture du contact principal (22) mobile avant l'ouverture du contact d'arc (28) mobile.1. Electric switch with self-blowing by rotation of the arc under the action of a magnetic field, having a sealed enclosure (10) filled with a gas with high dielectric strength, in particular sulfur hexafluoride in which are arranged a movable main contact (22) pivotally mounted on a first fixed axis (20) and cooperating with a fixed main contact (16) and a movable arcing contact (28) pivotally mounted on a second fixed axis (32) parallel to said first fixed axis (20) and cooperating with an electrode (26) of revolution, arranged coaxially inside a coil (24), electrically connected in series with arcing contacts (26, 28) in a circuit arc connected in parallel with the main circuit which includes said main contacts (16, 22), characterized in that said electrode (26) is in the form of a hollow cylinder inside which struggles said arcing contact (28) movable between two extreme closing positions and opening, in which positions the movable arcing contact (28) is respectively in contact with the internal periphery of the cylindrical electrode (26) and substantially in the center of said electrode and that a mechanical connection (40, 42, 46, 48, 50) connects the movable main contact (22) and the movable arcing contact (28) to cause the opening of the arcing contacts (26, 28) after that of the main contacts (16, 22) and closing arcing contacts (26, 28) before that of the main contacts (16, 22) said mechanical connection comprising an elastic element (50) for supplying the closing contact pressure of the arcing contacts (26, 28) and a means for neutralizing (44, 46) the elastic element in the central open position of the movable arcing contact (28) to create a rigid connection between the two movable contacts (22, 28), said elastic element (50) allowing a continued closing movement of the movable main contact (22) after coming into the closed position ure of the movable arcing contact and vice versa a preliminary movement of opening of the main contact (22) movable before the opening of the arcing contact (28) movable. 2. Interrupteur électrique selon la revendication 1, caractérisé en ce que ladite liaison mécanique comprend une manivelle (48) d'entraînement et une bielle (42) reliée par une articulation (44), à la manivelle, laquelle manivelle comporte ledit élément élastique (50) et que dans la position d'ouverture des contacts ladite manivelle (48) s'étend perpendiculairement à la bielle (42).2. Electric switch according to claim 1, characterized in that said mechanical connection comprises a crank (48) for driving and a connecting rod (42) connected by a joint (44), to the crank, which crank comprises said elastic element ( 50) and that in the open position of the contacts said crank (48) extends perpendicular to the connecting rod (42). 3. Interrupteur électrique selon la revendication 1 ou 2, caractérisé en ce que l'extrémité de la manivelle (48) comporte une lumière allongée (46) s'étendant dans la direction longitudinale de la manivelle, que l'extrémité de la bielle (42) porte un tourillon (44) monté à coulissement dans ladite lumière et qu'un ressort (50) sollicite ledit tourillon vers le fond de la lumière en bout de la manivelle.3. Electric switch according to claim 1 or 2, characterized in that the end of the crank (48) has an elongated opening (46) extending in the longitudinal direction of the crank, that the end of the connecting rod ( 42) carries a pin (44) slidably mounted in said light and a spring (50) biases said pin towards the bottom of the light at the end of the crank. 4. Interrupteur électrique selon la revendication 1, 2 ou 3, caractérisé en ce que la manivelle (48) d'entraînement est rigidement assujettie au contact mobile (22) principal pour effectuer un angle de débattement inférieur ou égal à 90° entre la position d'ouverture, dans laquelle la bielle (42) et la manivelle (48) sont sensiblement perpendiculaires et la position de fermeture des contacts (22, 28) dans laquelle la bielle (42) et la manivelle (48) sont voisines de la position d'alignement.4. Electric switch according to claim 1, 2 or 3, characterized in that the crank (48) drive is rigidly secured to the main movable contact (22) to perform a deflection angle less than or equal to 90 ° between the position opening, in which the connecting rod (42) and the crank (48) are substantially perpendicular and the closed position of the contacts (22, 28) in which the connecting rod (42) and the crank (48) are close to the position alignment. 5. Interrupteur électrique selon la revendication 1, 2, 3 ou 4, caractérisé en ce que le contact d'arc (28) mobile est monté à pivotement sur un deuxième axe (32) fixe parallèle audit premier axe (20) fixe et que l'extrémité de l'a bielle (42) opposée à la manivelle (48) est articulée au contact d'arc mobile.5. Electric switch according to claim 1, 2, 3 or 4, characterized in that the movable arcing contact (28) is pivotally mounted on a second fixed axis (32) parallel to said first fixed axis (20) and that the end of the connecting rod (42) opposite the crank (48) is articulated in contact with a movable arc. 6. Interrupteur électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit deuxième axe (32) fixe est disposé perpendiculairement sur l'axe (38) de ladite électrode (26) cylindrique et que ledit contact d'arc (28) mobile s'étend sur l'axe (38) de l'électrode (26) en position ouvert.6. Electric switch according to any one of the preceding claims, characterized in that said second fixed axis (32) is arranged perpendicularly on the axis (38) of said cylindrical electrode (26) and that said movable arcing contact (28) extends on the axis (38) of the electrode (26) in the open position. 7. Interrupteur électrique selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte un arbre rotatif (52) de commande traversant d'une manière étanche la paroi de ladite enceinte (10) et un système de transmission à bielle (58) et manivelle (54) de liaison mécanique entre le contact principal (22) mobile et ledit arbre rotatif (52) pour commander l'ouverture et la fermeture des contacts principaux (22, 16).7. Electrical switch according to any one of the preceding claims, characterized in that it comprises a rotary shaft (52) for control passing in sealed manner over the wall of said enclosure (10) and a connecting rod transmission system ( 58) and crank (54) for mechanical connection between the movable main contact (22) and said rotary shaft (52) to control the opening and closing of the main contacts (22, 16). 8. Interrupteur électrique selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte deux traversées (12, 14) dont les extrémités à l'intérieur de l'enceinte sont agencées en plages d'amenée de courant (16, 18) disposées face à face, l'une (16) desdites plages constituant le contact principal fixe et l'autre plage (18) portan0 ledit premier axe (20) fixe d'articulation du contact principal (22) pivotant sensiblement aligné avec lesdites plages (16, 18) en position de fermeture.8. Electric switch according to any one of the preceding claims, characterized in that it comprises two bushings (12, 14), the ends of which inside the enclosure are arranged in current supply ranges (16, 18) arranged face to face, one (16) of said pads constituting the fixed main contact and the other pad (18) portan0 said first axis (20) of articulation of the main contact (22) pivoting substantially aligned with said tracks (16, 18) in the closed position. 9. Interrupteur électrique selon la revendication 8, caractérisé en ce que ladite électrode cylindrique (26) et la bobine (24) sont disposées adjacentes dudit contact principal (16) fixe en étant décalées latéralement et en ce qu'un support (30) de l'axe (32) de pivotement du contact d'arc (28) mobile est solidaire de ladite autre plage (18) en s'étendant latéralement dans la direction de décalage de ladite électrode cylindrique (26) et de la bobine (24).9. Electric switch according to claim 8, characterized in that said cylindrical electrode (26) and the coil (24) are disposed adjacent to said main contact (16) fixed by being offset laterally and in that a support (30) of the pivoting axis (32) of the movable arcing contact (28) is integral with said other area (18) by extending laterally in the direction of offset of said cylindrical electrode (26) and of the coil (24) . 10. Interrupteur électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que le contact d'arc (28) mobile est un plot de contact en forme de galette coopérant avec la surface interne (36) de l'électrode cylindrique (26) et le contact principal (22) mobile est un couteau coopérant avec des pinces (16) de contact fixes.10. Electric switch according to any one of the preceding claims, characterized in that the movable arcing contact (28) is a contact pad in the form of a wafer cooperating with the internal surface (36) of the cylindrical electrode (26 ) and the movable main contact (22) is a knife cooperating with fixed contact clamps (16).
EP90420243A 1989-05-31 1990-05-18 Electrical switch with rotating arc Withdrawn EP0401131A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8907290 1989-05-31
FR898907290A FR2647948B1 (en) 1989-05-31 1989-05-31 ELECTRIC SWITCH WITH ROTATING ARC

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EP0401131A1 true EP0401131A1 (en) 1990-12-05

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EP90420243A Withdrawn EP0401131A1 (en) 1989-05-31 1990-05-18 Electrical switch with rotating arc

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US (1) US5003138A (en)
EP (1) EP0401131A1 (en)
JP (1) JPH0329227A (en)
CN (1) CN1022271C (en)
AU (1) AU619159B2 (en)
BR (1) BR9002557A (en)
CA (1) CA2016980A1 (en)
FR (1) FR2647948B1 (en)
ZA (1) ZA903982B (en)

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Publication number Priority date Publication date Assignee Title
EP0676782A2 (en) * 1994-04-08 1995-10-11 S&amp;C ELECTRIC COMPANY Rotating arc interrupter for loadbreak switch
EP0676782A3 (en) * 1994-04-08 1997-10-22 S & C Electric Co Rotating arc interrupter for loadbreak switch.

Also Published As

Publication number Publication date
BR9002557A (en) 1991-08-13
CN1047756A (en) 1990-12-12
CA2016980A1 (en) 1990-11-30
AU5608990A (en) 1990-12-06
JPH0329227A (en) 1991-02-07
ZA903982B (en) 1991-03-27
US5003138A (en) 1991-03-26
AU619159B2 (en) 1992-01-16
FR2647948B1 (en) 1994-03-04
FR2647948A1 (en) 1990-12-07
CN1022271C (en) 1993-09-29

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