EP0296915A1 - Rotating switch with curved arc-runner path - Google Patents

Rotating switch with curved arc-runner path Download PDF

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Publication number
EP0296915A1
EP0296915A1 EP88401386A EP88401386A EP0296915A1 EP 0296915 A1 EP0296915 A1 EP 0296915A1 EP 88401386 A EP88401386 A EP 88401386A EP 88401386 A EP88401386 A EP 88401386A EP 0296915 A1 EP0296915 A1 EP 0296915A1
Authority
EP
European Patent Office
Prior art keywords
contact
contacts
arc
rotary switch
migration
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.)
Granted
Application number
EP88401386A
Other languages
German (de)
French (fr)
Other versions
EP0296915B1 (en
Inventor
Guido Colleoni
Bernard Bouvet
Jacques Gaillard
Richard Jacolin
Robert Volsy
Georges Bernard
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
Priority to AT88401386T priority Critical patent/ATE86787T1/en
Publication of EP0296915A1 publication Critical patent/EP0296915A1/en
Application granted granted Critical
Publication of EP0296915B1 publication Critical patent/EP0296915B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • 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
    • H01H33/182—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using permanent magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H01H9/443—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using permanent magnets

Definitions

  • the invention relates to a medium-voltage rotary switch with a sealed casing, the internal periphery of which carries two diametrically opposite fixed contacts, each fixed contact being capable of cooperating with a movable contact of a contact bridge to form a pair of contacts, said contact bridge, in the form of a pivoting knife, being carried by a rotary control shaft, which can selectively occupy a closed position in which the two pairs of contacts are closed and an open position.
  • a known rotary switch of the kind mentioned has internal gas compression compartments allowing pneumatic blowing of the arc which promotes its extinction. These pneumatic blowing devices are complicated and require a significantly increased effort in operating the switch.
  • the present invention aims to allow the production of a simplified rotary switch whose breaking capacity is increased without significant modification of the device.
  • the rotary switch according to the present invention is characterized in that at least one of the contacts of one of said pairs comprises a migration path from the root of an arc, drawn during the opening of the pair of contacts , that this track extends in the opposite direction from the other contact of the pair, to allow the displacement of the arc root and the associated hot point towards a hidden location where the two hot points associated with the two roots of the arc are not facing each other and that a permanent magnet, integral with the contact with migration path, is arranged to blow the root of the arc towards said hidden location to promote the extinction of the arc and the interruption of the current.
  • the switch according to the present invention also makes use of a permanent magnet for magnetic blowing of the root of the arc, but the breaking principle is different since it is based on the observation that an important element for the non re-ignition after the zero current has passed is to prevent the two hot spots on the two contacts from facing each other.
  • the rotary knife switch can comprise two cuts in series and the inventive arc root migration system can be associated with each of said cuts or only with one of them.
  • the contact with arc migration track having a hidden hot point can be the mobile contact, or the fixed contact, or both and the permanent magnet is advantageously housed inside the contact in the form of a stud, in particular cylindrical.
  • the axis of the cylindrical contact pad (s) is perpendicular to the plane of travel of the knife, and the arc of migration of the arc root is formed by the external periphery of the contact pad, this periphery possibly being the cylindrical surface of the pad or the periphery of one or more lateral sections of the stud.
  • the displacement of the arc can be guided on the migration track by covering the adjacent parts of the contact pad with an insulating coating.
  • the arc root and the point associated hot move along a curved trajectory and it is clear that when the root reaches the hidden location, diametrically opposite on the cylindrical stud at the point of arcing, this hidden location is masked by the contact stud at the for the other contact.
  • the rotation of the knife in a predetermined direction can be used to introduce an asymmetry which favors one of the directions of rotation of the arc root.
  • the direction of rotation is determined by the polarity of the permanent magnet and by the direction of the current at the given time. During one of the alternations of the current, the root moves on the migration track in a given direction, which reverses automatically at the next alternation.
  • the switch can be of the multipolar type with a common envelope for all the poles or with an individual envelope.
  • the insulating gas for filling the envelopes is a gas with high dielectric strength such as sulfur hexafluoride at atmospheric or compressed pressure.
  • the envelope can be made of an insulating or conductive material and the control mechanism can be incorporated or be arranged outside this envelope.
  • the migration path of the arc root is capped by a cover in the area of the hidden location to limit the propagation of the electrons emitted in this area.
  • This hood determines with the migration path an arc penetration corridor confining the ionized gases and the metallic vapors.
  • a medium-voltage rotary switch comprises a sealed casing 10 ensuring the housing of the three poles R, S, T of the switch.
  • the casing 10 can be common to the three RST poles and be metallic or made of insulating material. It can also be constituted by the association of three modules, each assigned to one of the poles or be a single envelope 10 subdivided into three compartments by internal partitions 12, as shown in Figure 1.
  • the three poles R , S, T are identical and only one of them will be described in detail below.
  • the sealed envelope 10 is filled with a gas with high dielectric strength such as sulfur hexafluoride under atmospheric pressure or in overpressure.
  • Each pole has two fixed contacts 14,16 arranged at the inner periphery of the casing 10 at diametrically opposite points and each fixed contact 14,16 is extended by a sealed passage 18,20 of the casing 10.
  • the movable assembly of the switch is constituted by a control shaft 22, carrying a rotary knife 28 constituted by two contact blades 24, 26 whose opposite ends 30, 32 form movable contact clips cooperating with the fixed contacts 14, 16.
  • the knife 28 In the closed position of the switch, shown in Figure 2, the knife 28 electrically connects the fixed contacts 14,16 and the opening of the switch is achieved by a rotation of the shaft 22 counterclockwise of a watch.
  • the two fixed contacts 14, 16 are identical and each is arranged in the form of a cylindrical stud with an axis parallel to the shaft 22.
  • a permanent magnet 34 coated with a conductive sheath 36 of cylindrical shape Inside the cylindrical stud 14, 16 is housed a permanent magnet 34 coated with a conductive sheath 36 of cylindrical shape. Between the pole faces of the permanent magnet 34 with axial magnetization and the sheath 36 are inserted discs 38 of thin steel. In the closed position, the movable contact clamp 30,32 encloses the lower periphery of the cylindrical contact pad 14,16, the contact blades 24,26 being in contact with the lateral edges of this pad.
  • the axial dimension of the cylindrical stud 14,16 is slightly greater than the spacing of the clamps formed by the blades 24,26 to obtain sufficient contact pressure.
  • the upper part of the lateral edges of the contact 14, 16 is coated with an insulating material 40 preventing the migration of the arc on this part.
  • the field lines of the permanent magnet 34 are shown in broken lines on the pole S of FIG. 1 and it can be seen that these lines extend parallel to the cylindrical periphery 42 of the contact pad 14, 16. This periphery 42 constitutes a migration path of the arc root anchored on this contact 14,16.
  • the current flows through the sheath 36 of the contact pad 14,16 outside the permanent magnet 34 without risk of demagnetization of the latter.
  • the knife 28 separates from the fixed contacts 14, 16, and two arcs 44, 46, electrically connected in series, are drawn respectively between the fixed contact 14 and the knife 28, and between the latter and the fixed contact16.
  • the arc roots 48.50 anchored on the fixed contacts 14.16 are blown and they migrate on the cylindrical periphery 42 forming a migration path from the root of bow.
  • the direction of rotation of the arc root 48.50 is determined by the polarity of the alternating current at the time of cutting, and in Figure 3 we see that the two arc roots 48.50 are blown towards a hidden location 52.54 diametrically opposite to the point where the arc arises opposite the knife 28.
  • the hot spots associated with the arc roots 48.50 are thus transferred to hidden locations 52.54 and during natural extinction arcs 44,46, when the current crosses to zero, the optimal conditions for non-restriking are respected.
  • thermoelectronic emission at the hot point 52,54 does not take place opposite the knife 28, which prevents or limits the risks of re-striking the arcs 44,46 during the appearance of the recovery voltage.
  • the migration of the roots of the arc 48.50 naturally participates in the elongation of the arc and in its displacement in the gaseous insulating medium to favor, in the usual way, the breaking of the current.
  • FIG. 3 shows that, when the polarity of the current is reversed at the time of the formation of the arcs 44,46, the arc roots 48,50 rotate in the opposite direction to come towards the crossings 18,20 in locations less distant and hidden from the knife 28 as the hidden locations 52,54. If the power failure does not occur at the first zero crossing of the current and it is necessary to wait for the end of the next alternation where the optimal conditions of presence, hot spots at the hidden locations 52,54 are found. Certain specific arrangements described below avoid this asymmetry.
  • the fixed contact 14 comprises a insulating coating in particular made of epoxy resin 56 covering the cylindrical surface of the contact pad 14.
  • the flat edges or surfaces of the contact pad 14 are however bare and they constitute the contact and migration surfaces of the arc root.
  • the operation of the switch is not affected by this modification, the arc root anchored on the fixed contact 14 being blown by the magnetic field of the permanent magnet along the periphery of the side or edges of the stud contact 14 to a hidden point 58 which is not opposite the movable contact knife 28.
  • the contact blades 24, 26 have been extended to move the contact point in the direction of the enclosure 10 and to distance the current path from the magnet 34 while limiting the risks of demagnetization. This feature can be used on the other variants described.
  • the pair of contacts 14, 28 is replaced by a sliding contact 60.
  • the rotation in the opening direction of the knife 28 generates the appearance of a single arc 46 which is extinguished in the manner described above by migrating the arc root to a hidden location.
  • the insertion of a single arc in the circuit to be interrupted limits the breaking capacity of the switch but the production of the latter is simplified.
  • the polarity of the permanent magnets 34 determines the direction of rotation of the arcs 44,46 and in the example described with reference to FIGS. 1 to 3, the extinction and the interruption of the current are favored for one of the alternations of the alternating current.
  • a asymmetry between the contacts 14,16 is introduced by choosing opposite polarities of the magnets 34 associated with these contacts 14,16 so that if one of the arcs, for example the arc 44 is blown towards the hidden location 52, at a given instant the other arc 46 is blown towards the hidden location 54 at the next alternation.
  • one of the arcs 44,46 will be blown towards the hidden location favoring extinction. This avoids any delay in breaking the current but with a slight detriment to the extinguishing power of one of the arcs 44,46.
  • the arc root migration tracks are preferably associated with the fixed contacts 14, 16 in the manner described above, but it is clear that it would not be departing from the scope of the invention to associate these tracks with the mobile contacts 30.32 carried by the knife 28 ( Figure 8).
  • the inertia of the moving assembly is increased by the presence of the permanent magnets 34 but the operation, in particular the displacement of the arc roots towards hidden locations, which are not opposite the opposite contact, remains fully preserved.
  • Only one of the contacts 30, 32 can moreover be equipped with an arc migration track, the other contact being a standard contact or a contact having the arc root migration track associated with the fixed contacts. . Any other combination is conceivable and more particularly that shown in FIG. 10 in which all of the contacts 14, 16, 30, 32 are equipped with a migration track and an associated permanent magnet. The choice of the directions of rotation of the arc roots is thus notably increased and this choice is made according to the desired performances.
  • a cover 62 surrounds the pads of fixed contacts 14,16 in the vicinity of the hidden location 52,54.
  • the cover 62 defines a corridor of small width allowing the penetration of the arc root and its migration to the hidden location 52, 54, while confining the electrons emitted by the hot spots in a space remote from the contacts.
  • Hood 62 can wrap the fixed contact 14, 16 leaving only a slot for penetration of the arc, or this cover 62 can be constituted by a simple screen arranged opposite the hot spots. It emerges from the preceding description, that the rotational movement of the knife 28 introduces a asymmetry favoring cutting for one of the alternations of the current. By moving the fixed contact pads 14,16 with respect to the bushings 18,20, as shown in Figure 11, to arrange the separation points of the contacts 14,28; 16,28 and the current supply points at the contact pads 14, 16 at diametrically opposite locations, this asymmetry is avoided and the hidden points are reached whatever the alternation of the current.
  • the invention is of course applicable to other types of switches and more particularly to a switch having an enclosure 10 or tank of the modular type or, a metal tank.
  • the switch may also include grounding contacts carried by the casing 10 and cooperating with the knife 28 and the contacts 14, 16, 28 may be of the abutment type or of any other constitution.

Abstract

A rotary switch with a sealed enclosure in which a rotating knife-blade is housed cooperating with two stationary contacts supported by the internal periphery of the enclosure. A permanent magnet is incorporated in the stationary contacts to magnetically blow the arc roots on a curved migration track towards hidden locations which are not facing the knife-blade. The invention is applicable to a gas-insulated medium voltage switch.

Description

L'invention est relative à un interrupteur rotatif moyenne tension à enveloppe étanche, dont le pourtour interne porte deux contacts fixes diamétralement opposés, chaque contact fixe étant susceptible de coopérer avec un contact mobile d'un pont de contacts pour former une paire de contacts, ledit pont de contacts, en forme de couteau pivotant, étant porté par un arbre rotatif de commande, qui peut occuper sélectivement une position de fermeture dans laquelle les deux paires de contacts sont fermées et une position d'ouverture.The invention relates to a medium-voltage rotary switch with a sealed casing, the internal periphery of which carries two diametrically opposite fixed contacts, each fixed contact being capable of cooperating with a movable contact of a contact bridge to form a pair of contacts, said contact bridge, in the form of a pivoting knife, being carried by a rotary control shaft, which can selectively occupy a closed position in which the two pairs of contacts are closed and an open position.

Un interrupteur rotatif connu du genre mentionné comporte des compartiments internes de compression du gaz permettant un soufflage pneumatique de l'arc qui favorise son extinction. Ces dispositifs de soufflage pneumatique sont compliqués et nécessitent un effort de manoeuvre de l'interrupteur notablement accru.A known rotary switch of the kind mentioned has internal gas compression compartments allowing pneumatic blowing of the arc which promotes its extinction. These pneumatic blowing devices are complicated and require a significantly increased effort in operating the switch.

La présente invention a pour but de permettre la réalisation d'un interrupteur rotatif simplifié dont le pouvoir de coupure est augmenté sans modification notable de l'appareil.The present invention aims to allow the production of a simplified rotary switch whose breaking capacity is increased without significant modification of the device.

L'interrupteur rotatif selon la présente invention est caractérisé en ce que au moins l'un des contacts de l'une desdites paires comporte une piste de migration de la racine d'un arc, tiré lors de l'ouverture de la paire de contacts, que cette piste s'étend en direction opposée de l'autre contact de la paire, pour permettre le déplacement de la racine d'arc et du point chaud associé vers un emplacement caché où les deux points chauds associés aux deux racines de l'arc ne sont pas en regard et qu'un aimant permanent, solidaire du contact à piste de migration, est agencé pour souffler la racine de l'arc vers ledit emplacement caché pour favoriser l'extinction de l'arc et la coupure du courant.The rotary switch according to the present invention is characterized in that at least one of the contacts of one of said pairs comprises a migration path from the root of an arc, drawn during the opening of the pair of contacts , that this track extends in the opposite direction from the other contact of the pair, to allow the displacement of the arc root and the associated hot point towards a hidden location where the two hot points associated with the two roots of the arc are not facing each other and that a permanent magnet, integral with the contact with migration path, is arranged to blow the root of the arc towards said hidden location to promote the extinction of the arc and the interruption of the current.

Dans les interrupteurs moyenne tension, on utilise l'extinction naturelle de l'arc au passage au zéro du courant pour assurer la coupure en empêchant un réallumage de l'arc. Pour limiter les risques de réamorçage d'un arc après le passage au zéro du courant, certains interrupteurs comportent des dispositifs de soufflage magnétique de l'arc, notamment par des aimants permanents imposant une rotation de l'arc. La rotation de l'arc et de ses racines réduit l'échauffement et l'ionisation du gaz isolant ainsi que la présence de points chauds sur les contacts, susceptibles d'émettre des électrons par émission thermoélectronique. L'interrupteur selon la présente invention fait également usage d'un aimant permanent de soufflage magnétique de la racine de l'arc, mais le principe de coupure est différent puisqu'il est basé sur la constatation qu'un élément important pour le non-réamorçage après le passage au zéro du courant est d'éviter que les deux points chauds sur les deux contacts, soient en regard l'un de l'autre. En déplaçant au moins l'une des racines de l'arc vers un emplacement caché, notamment sur la partie postérieure du contact éloigné de l'autre contact, il est possible d'éviter l'émission d'électrons dans la zone de séparation des contacts.In medium-voltage switches, natural arc extinction is used when the current crosses to zero to ensure breaking, preventing re-ignition of the arc. To limit the risks of re-striking an arc after the current has gone to zero, certain switches include devices for magnetic blowing of the arc, in particular by permanent magnets imposing a rotation of the arc. The rotation of the arc and its roots reduces the heating and ionization of the insulating gas as well as the presence of hot spots on the contacts, capable of emitting electrons by thermoelectronic emission. The switch according to the present invention also makes use of a permanent magnet for magnetic blowing of the root of the arc, but the breaking principle is different since it is based on the observation that an important element for the non re-ignition after the zero current has passed is to prevent the two hot spots on the two contacts from facing each other. By moving at least one of the roots of the arc to a hidden location, especially on the rear part of the contact far from the other contact, it is possible to avoid the emission of electrons in the zone of separation of the contacts.

L'interrupteur rotatif à couteau peut comporter deux coupures en série et le système inventif de migration de la racine d'arc peut être associé à chacune desdites coupures ou uniquement à l'une d'entre elles. Le contact à piste de migration d'arc ayant un point chaud caché peut être le contact mobile, ou le contact fixe, ou les deux et l'aimant permanent est avantageusement logé à l'intérieur du contact en forme de plot notamment cylindrique. L'axe du ou des plots cylindriques de contacts est perpendiculaire au plan de débattement du couteau, et la piste de migration de la racine d'arc est constituée par le pourtour externe du plot de contact, ce pourtour pouvant être la surface cylindrique du plot ou la périphérie d'une ou des tranches latérales du plot. Le déplacement de l'arc peut être guidé sur la piste de migration en recouvrant les parties adjacentes du plot de contact par un revêtement isolant. La racine d'arc et le point chaud associé se déplacent suivant une trajectoire courbe et il est clair que lorsque la racine atteint l'emplacement caché, diamétralement opposé sur le plot cylindrique au point d'amorçage de l'arc, cet emplacement caché est masqué par le plot de contact à l'égard de l'autre contact. La rotation du couteau dans un sens prédéterminé peut être utilisée pour introduire une disymétrie qui privilégie l'un des sens de rotation de la racine d'arc. Le sens de rotation est déterminé par la polarité de l'aimant permanent et par le sens du courant à l'instant donné. Pendant l'une des alternances du courant, la racine se déplace sur la piste de migration dans une direction donnée, laquelle s'inverse automatiquement à l'alternance suivante. Il ressortira plus clairement de la description détaillée suivante, que le choix de cette direction de rotation peut être mis à contribution pour favoriser, soit la rapidité de l'extinction de l'arc, soit le pouvoir de coupure de l'interrupteur. L'invention est applicable à tout type de contacts, notamment aux contacts aboutés ou aux contacts à pinces plus particulièrement décrits par la suite. L'interrupteur peut être du type multipolaire à enveloppe commune à l'ensemble des pôles ou à enveloppe individuelle. Le gaz isolant de remplissage des enveloppes est un gaz à rigidité diélectrique élevée tel que l'hexafluorure de soufre à pression atmosphérique ou comprimée. L'enveloppe peut être en un matériau isolant ou conducteur et le mécanisme de commande peut être incorporé ou être disposé à l'extérieur de cette enveloppe.The rotary knife switch can comprise two cuts in series and the inventive arc root migration system can be associated with each of said cuts or only with one of them. The contact with arc migration track having a hidden hot point can be the mobile contact, or the fixed contact, or both and the permanent magnet is advantageously housed inside the contact in the form of a stud, in particular cylindrical. The axis of the cylindrical contact pad (s) is perpendicular to the plane of travel of the knife, and the arc of migration of the arc root is formed by the external periphery of the contact pad, this periphery possibly being the cylindrical surface of the pad or the periphery of one or more lateral sections of the stud. The displacement of the arc can be guided on the migration track by covering the adjacent parts of the contact pad with an insulating coating. The arc root and the point associated hot move along a curved trajectory and it is clear that when the root reaches the hidden location, diametrically opposite on the cylindrical stud at the point of arcing, this hidden location is masked by the contact stud at the for the other contact. The rotation of the knife in a predetermined direction can be used to introduce an asymmetry which favors one of the directions of rotation of the arc root. The direction of rotation is determined by the polarity of the permanent magnet and by the direction of the current at the given time. During one of the alternations of the current, the root moves on the migration track in a given direction, which reverses automatically at the next alternation. It will appear more clearly from the following detailed description that the choice of this direction of rotation can be used to promote either the speed of extinction of the arc or the breaking capacity of the switch. The invention is applicable to any type of contact, in particular to butted contacts or to clamp contacts more particularly described below. The switch can be of the multipolar type with a common envelope for all the poles or with an individual envelope. The insulating gas for filling the envelopes is a gas with high dielectric strength such as sulfur hexafluoride at atmospheric or compressed pressure. The envelope can be made of an insulating or conductive material and the control mechanism can be incorporated or be arranged outside this envelope.

Selon un perfectionnement de l'invention, la piste de migration de la racine d'arc est coiffée par un capot dans la zone de l'emplacement caché pour limiter la propagation des électrons émis dans cette zone. Ce capot détermine avec la piste de migration un couloir de pénétration de l'arc confinant les gaz ionisés et les vapeurs métalliques.According to an improvement of the invention, the migration path of the arc root is capped by a cover in the area of the hidden location to limit the propagation of the electrons emitted in this area. This hood determines with the migration path an arc penetration corridor confining the ionized gases and the metallic vapors.

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre de différents modes de mise en oeuvre de l'invention donnés à titre d'exemples non limitatifs, et représentés aux dessins annexés dans lesquels:

  • - la figure 1 est une vue schématique partiellement en coupe d'un interrupteur multipolaire selon l'invention;
  • - la figure 2 est une coupe suivant la ligne II-II de la figure 1 représentant l'interrupteur en position fermé;
  • -la figure 3 est une vue analogue à celle de la figure 2 montrant l'interrupteur en cours d'ouverture;
  • - la figure 4 est une demi-coupe illustrant une variante de réalisation selon l'invention;
  • -la figure 5 est une vue de côté en coupe de l'interrupteur selon la figure 4;
  • - les figures 6 à 11 sont des vues analogues à la figure 2, illustrant différentes variantes de réalisation selon l'invention.
Other advantages and characteristics will emerge more clearly from the following description of different embodiments of the invention given by way of non-illustrative examples. limiting, and shown in the accompanying drawings in which:
  • - Figure 1 is a schematic view partially in section of a multipole switch according to the invention;
  • - Figure 2 is a section along line II-II of Figure 1 showing the switch in the closed position;
  • FIG. 3 is a view similar to that of FIG. 2 showing the switch during opening;
  • - Figure 4 is a half-section illustrating an alternative embodiment according to the invention;
  • FIG. 5 is a side view in section of the switch according to FIG. 4;
  • - Figures 6 to 11 are views similar to Figure 2, illustrating different alternative embodiments according to the invention.

Sur les figures un interrupteur rotatif moyenne tension comporte une enveloppe étanche 10 assurant le logement des trois pôles R,S,T de l'interrupteur. L'enveloppe 10 peut être commune aux trois pôles RST et être métallique ou en matériau isolant. Elle peut également être constituée par l'association de trois modules, chacun affecté à l'un des pôles ou être une enveloppe unique 10 subdivisée en trois compartiments par des cloisons internes 12, de la manière représentée à la figure 1. Les trois pôles R,S,T sont identiques et seul l'un d'entre eux sera décrit en détail par la suite. L'enveloppe étanche 10 est remplie d'un gaz à rigidité diélectrique élevée tel que l'hexafluorure de soufre sous pression atmosphérique ou en surpression.In the figures, a medium-voltage rotary switch comprises a sealed casing 10 ensuring the housing of the three poles R, S, T of the switch. The casing 10 can be common to the three RST poles and be metallic or made of insulating material. It can also be constituted by the association of three modules, each assigned to one of the poles or be a single envelope 10 subdivided into three compartments by internal partitions 12, as shown in Figure 1. The three poles R , S, T are identical and only one of them will be described in detail below. The sealed envelope 10 is filled with a gas with high dielectric strength such as sulfur hexafluoride under atmospheric pressure or in overpressure.

Chaque pôle comporte deux contacts fixes 14,16 disposés à la périphérie interne de l'enveloppe 10 en des points diamétralement opposés et chaque contact fixe14,16 est prolongé par une traversée 18,20 étanche de l'enveloppe 10. L'équipage mobile de l'interrupteur est constitué par un arbre de commande 22, portant un couteau rotatif 28 constitué par deux lames de conctacts 24,26 dont les extrémités opposées 30,32 forment des pinces de contacts mobiles coopérant avec les contacts fixes 14,16. Dans la position fermée de l'interrupteur, représentée à la figure 2, le couteau 28 relie électriquement les contacts fixes 14,16 et l'ouverture de l'interrupteur est réalisée par une rotation de l'arbre 22 dans le sens inverse des aiguilles d'une montre. Les deux contacts fixes 14,16 sont identiques et chacun est agencé en forme de plot cylindrique d'axe parallèle à l'arbre 22. A l'intérieur du plot cylindrique14,16 est logé un aimant permanent 34 enrobé par une gaine conductrice 36 de forme cylindrique. Entre les faces polaires de l'aimant permanent 34 à aimantation axiale et la gaine 36 sont intercalés des disques 38 en acier de faible épaisseur. En position de fermeture la pince de contact mobile 30,32 enserre le pourtour inférieur du plot de contact cylindrique 14,16, les lames de contacts 24,26 étant au contact des tranches latérales de ce plot. La dimension axiale du plot cylindrique14,16 est légèrement supérieure à l'écartement des pinces constituées par les lames 24,26 pour obtenir une pression de contact suffisante. La partie supérieure des tranches latérales du contact 14,16 est revêtue d'un matériau isolant 40 empêchant la migration de l'arc sur cette partie.Each pole has two fixed contacts 14,16 arranged at the inner periphery of the casing 10 at diametrically opposite points and each fixed contact 14,16 is extended by a sealed passage 18,20 of the casing 10. The movable assembly of the switch is constituted by a control shaft 22, carrying a rotary knife 28 constituted by two contact blades 24, 26 whose opposite ends 30, 32 form movable contact clips cooperating with the fixed contacts 14, 16. In the closed position of the switch, shown in Figure 2, the knife 28 electrically connects the fixed contacts 14,16 and the opening of the switch is achieved by a rotation of the shaft 22 counterclockwise of a watch. The two fixed contacts 14, 16 are identical and each is arranged in the form of a cylindrical stud with an axis parallel to the shaft 22. Inside the cylindrical stud 14, 16 is housed a permanent magnet 34 coated with a conductive sheath 36 of cylindrical shape. Between the pole faces of the permanent magnet 34 with axial magnetization and the sheath 36 are inserted discs 38 of thin steel. In the closed position, the movable contact clamp 30,32 encloses the lower periphery of the cylindrical contact pad 14,16, the contact blades 24,26 being in contact with the lateral edges of this pad. The axial dimension of the cylindrical stud 14,16 is slightly greater than the spacing of the clamps formed by the blades 24,26 to obtain sufficient contact pressure. The upper part of the lateral edges of the contact 14, 16 is coated with an insulating material 40 preventing the migration of the arc on this part.

Les lignes de champ de l'aimant permanent 34 sont représentées en trait discontinu sur le pôle S de la figure 1 et on voit que ces lignes s'étendent parallèlement au pourtour cylindrique 42 du plot de contact 14,16. Ce pourtour 42 constitue une piste de migration de la racine d'arc ancrée sur ce contact 14,16. En position de fermeture de l'interrupteur, représentée sur la figure 2, le courant passe par la gaine 36 du plot de contact 14,16 à l'extérieur de l'aimant permanent 34 sans risque de désaimantation de ce dernier. Lors d'une ouverture par rotation de l'arbre 22, le couteau 28 se sépare des contacts fixes14,16, et deux arcs 44,46, connectés électriquement en série, sont tirés respectivement entre le contact fixe 14 et le couteau 28, et entre ce dernier et le contact fixe16. Sous l'action du champ magnétique de l'aimant permanent 34, les racines d'arc 48,50 ancrées sur les contacts fixes 14,16 sont soufflées et elles migrent sur le pourtour cylindrique 42 formant une piste de migration de la racine d'arc. Le sens de rotation de la racine d'arc 48,50 est déterminé par la polarité du courant alternatif à l'instant de la coupure, et sur la figure 3 on voit que les deux racines d'arc 48,50 sont soufflées vers un emplacement caché 52,54 diamétralement opposé au point de formation de l'arc en regard du couteau 28. Les points chauds associés aux racines d'arc 48,50 sont ainsi reportés en des emplacements cachés 52,54 et lors de l'extinction naturel des arcs 44,46, au passage à zéro du courant, les conditions optimales de non réamorçage sont respectées. En effet, l'émission thermoélectronique au point chaud 52,54 n'a pas lieu en regard du couteau 28, ce qui empêche ou limite les risques de réamorçage des arcs 44,46 lors de l'apparition de la tension de rétablissement. La migration des racines d'arc 48,50 participe bien entendu à l'allongement de l'arc et à son déplacement dans le milieu isolant gazeux pour favoriser de la manière usuelle, la coupure du courant. On voit sur la figure 3 que, lorsque la polarité du courant est inverse au moment de la formation des arcs 44,46, les racines d'arc 48,50 tournent en sens opposé pour venir vers les traversées 18,20 en des emplacements moins éloignés et cachés du couteau 28 que les emplacements cachés 52,54. Si la coupure du courant n' intervient pas au premier passage à zéro du courant et il faut attendre la fin de l'alternance suivante où les conditions optimales de présence, des points chauds aux emplacements cachés 52,54 sont retrouvées. Certains agencements particuliers décrits ci-­après, évitent cette disymétrie.The field lines of the permanent magnet 34 are shown in broken lines on the pole S of FIG. 1 and it can be seen that these lines extend parallel to the cylindrical periphery 42 of the contact pad 14, 16. This periphery 42 constitutes a migration path of the arc root anchored on this contact 14,16. In the closed position of the switch, shown in Figure 2, the current flows through the sheath 36 of the contact pad 14,16 outside the permanent magnet 34 without risk of demagnetization of the latter. When the shaft 22 is opened by rotation, the knife 28 separates from the fixed contacts 14, 16, and two arcs 44, 46, electrically connected in series, are drawn respectively between the fixed contact 14 and the knife 28, and between the latter and the fixed contact16. Under the action of the magnetic field of the permanent magnet 34, the arc roots 48.50 anchored on the fixed contacts 14.16 are blown and they migrate on the cylindrical periphery 42 forming a migration path from the root of bow. The direction of rotation of the arc root 48.50 is determined by the polarity of the alternating current at the time of cutting, and in Figure 3 we see that the two arc roots 48.50 are blown towards a hidden location 52.54 diametrically opposite to the point where the arc arises opposite the knife 28. The hot spots associated with the arc roots 48.50 are thus transferred to hidden locations 52.54 and during natural extinction arcs 44,46, when the current crosses to zero, the optimal conditions for non-restriking are respected. In fact, the thermoelectronic emission at the hot point 52,54 does not take place opposite the knife 28, which prevents or limits the risks of re-striking the arcs 44,46 during the appearance of the recovery voltage. The migration of the roots of the arc 48.50 naturally participates in the elongation of the arc and in its displacement in the gaseous insulating medium to favor, in the usual way, the breaking of the current. It can be seen in FIG. 3 that, when the polarity of the current is reversed at the time of the formation of the arcs 44,46, the arc roots 48,50 rotate in the opposite direction to come towards the crossings 18,20 in locations less distant and hidden from the knife 28 as the hidden locations 52,54. If the power failure does not occur at the first zero crossing of the current and it is necessary to wait for the end of the next alternation where the optimal conditions of presence, hot spots at the hidden locations 52,54 are found. Certain specific arrangements described below avoid this asymmetry.

Sur les figures suivantes, qui illustrent différentes variantes de réalisation, les mêmes numéros de repères désignent des éléments analogues ou identiques à ceux des figures 1 à 3.In the following figures, which illustrate different variant embodiments, the same reference numbers designate elements similar or identical to those of FIGS. 1 to 3.

En se reférant aux figures 4 et 5 on voit une variante de réalisation dans laquelle le contact fixe 14 comporte un revêtement isolant en particulier en résine époxyde 56 recouvrant la surface cylindrique du plot de contact 14. Les tranches ou surfaces planes du plot de contact14 sont par contre nues et elles constituent les surfaces de contact et de migration de la racine d'arc. Le fonctionnement de l'interrupteur n'est pas affecté par cette modification, la racine d'arc ancrée sur le contact fixe 14 étant soufflée par le champ magnétique de l'aimant permanent le long de la périphérie de la ou des tranches latérales du plot de contact 14 vers un point caché 58 qui n'est pas en regard du couteau de contact mobile 28. Dans cette variante, il est avantageux d'utiliser un aimant permanent 34 à aimantation radiale. Les lames de contact 24, 26 ont été prolongées pour déplacer le point de contact en direction de l'enceinte 10 et éloigner le trajet du courant de l'aimant 34 en limitant les risques de démagnétisation. Cette particularité est utilisable sur les autres variantes décrites.Referring to Figures 4 and 5 we see an alternative embodiment in which the fixed contact 14 comprises a insulating coating in particular made of epoxy resin 56 covering the cylindrical surface of the contact pad 14. The flat edges or surfaces of the contact pad 14 are however bare and they constitute the contact and migration surfaces of the arc root. The operation of the switch is not affected by this modification, the arc root anchored on the fixed contact 14 being blown by the magnetic field of the permanent magnet along the periphery of the side or edges of the stud contact 14 to a hidden point 58 which is not opposite the movable contact knife 28. In this variant, it is advantageous to use a permanent magnet 34 with radial magnetization. The contact blades 24, 26 have been extended to move the contact point in the direction of the enclosure 10 and to distance the current path from the magnet 34 while limiting the risks of demagnetization. This feature can be used on the other variants described.

Dans l'interrupteur selon la figure 6, la paire de contacts 14,28 est remplacée par un contact coulissant 60. La rotation en direction d'ouverture du couteau 28 engendre l'apparition d'un arc unique 46 qui est éteint de la manière décrite ci-dessus par migration de la racine d'arc vers un emplacement caché. L'insertion d'un seul arc dans le circuit à interrompre limite le pouvoir de coupure de l'interrupteur mais la réalisation de ce dernier est simplifiée.In the switch according to FIG. 6, the pair of contacts 14, 28 is replaced by a sliding contact 60. The rotation in the opening direction of the knife 28 generates the appearance of a single arc 46 which is extinguished in the manner described above by migrating the arc root to a hidden location. The insertion of a single arc in the circuit to be interrupted limits the breaking capacity of the switch but the production of the latter is simplified.

La polarité des aimants permanents 34 détermine le sens de rotation des arcs 44,46 et dans l'exemple décrit en référence aux figures 1 à 3, l'extinction et la coupure du courant sont favorisées pour l'une des alternances du courant alternatif. Dans la variante représentée à la figure 7, une disymétrie entre les contacts 14,16 est introduite en choisissant des polarités inverses des aimants 34 associés à ces contacts 14,16 de telle manière que si l'un des arcs, par exemple l'arc 44 est soufflé vers l'emplacement caché 52, à un instant donné l'autre arc 46 est soufflé vers l'emplacement caché 54 à l'alternance suivante. Quelle que soit la polarité de l'alternance au moment de l'ouverture des contacts 14,16,28, l'un des arcs 44,46 sera soufflé vers l'emplacement caché favorisant l'extinction. On évite ainsi tout retard à la coupure du courant mais avec un léger détriment du pouvoir d'extinction de l'un des arcs 44,46.The polarity of the permanent magnets 34 determines the direction of rotation of the arcs 44,46 and in the example described with reference to FIGS. 1 to 3, the extinction and the interruption of the current are favored for one of the alternations of the alternating current. In the variant shown in Figure 7, a asymmetry between the contacts 14,16 is introduced by choosing opposite polarities of the magnets 34 associated with these contacts 14,16 so that if one of the arcs, for example the arc 44 is blown towards the hidden location 52, at a given instant the other arc 46 is blown towards the hidden location 54 at the next alternation. Whatever the polarity of the alternation at the time of the opening of the contacts 14,16,28, one of the arcs 44,46 will be blown towards the hidden location favoring extinction. This avoids any delay in breaking the current but with a slight detriment to the extinguishing power of one of the arcs 44,46.

Les pistes de migration des racines d'arc sont de préférence associées aux contacts fixes 14,16 de la manière décrite ci-­dessus, mais il est clair qu'on ne sortirait pas du cadre de l'invention en associant ces pistes aux contacts mobiles 30,32 portées par le couteau 28 (figure 8). L'inertie de l'équipage mobile est augmentée par la présence des aimants permanents 34 mais le fonctionnement, notamment le déplacement des racines d'arc vers des emplacements cachés, qui ne sont pas en regard du contact opposé, reste intégralement conservé. Seul l'un des contacts 30,32 peut d'ailleurs être équipé d'une piste de migration d'arc, l'autre contact étant un contact standard ou un contact ayant la piste demigration de la racine d'arc associée aux contacts fixes. Toute autre combinaison est concevable et plus particulièrement celle représentée sur la figure 10 dans laquelle l'ensemble des contacts14,16,30,32 sont équipés d'une piste de migration et d'un aimant permanent associé. Le choix des sens de rotation des racines d'arc est ainsi notablement augmenté et ce choix est effectué en fonction des performances recherchées.The arc root migration tracks are preferably associated with the fixed contacts 14, 16 in the manner described above, but it is clear that it would not be departing from the scope of the invention to associate these tracks with the mobile contacts 30.32 carried by the knife 28 (Figure 8). The inertia of the moving assembly is increased by the presence of the permanent magnets 34 but the operation, in particular the displacement of the arc roots towards hidden locations, which are not opposite the opposite contact, remains fully preserved. Only one of the contacts 30, 32 can moreover be equipped with an arc migration track, the other contact being a standard contact or a contact having the arc root migration track associated with the fixed contacts. . Any other combination is conceivable and more particularly that shown in FIG. 10 in which all of the contacts 14, 16, 30, 32 are equipped with a migration track and an associated permanent magnet. The choice of the directions of rotation of the arc roots is thus notably increased and this choice is made according to the desired performances.

En évitant selon l'invention que les points chauds soient en regard au moment de la coupure, les risques de non rétablissement sont faibles mais ils peuvent encore être réduits en prévoyant, selon un développement de l'invention, un confinement de ces points chauds. Dans la variante illustrée par la figure 9, dont la structure générale correspond à celle illustrée par les figures 2 et 3, un capot 62 entoure les plots de contacts fixes 14,16 au voisinage de l'emplacement caché 52,54. Le capot 62 définit un couloir de faible largeur permettant la pénétration de la racine d'arc et sa migration vers l'emplacement caché 52,54, tout en confinant les électrons émis par les points chauds dans un espace éloigné des contacts. Le capot 62 peut envelopper le contact fixe14,16 en ne laissant subsister qu'une fente de pénétration de l'arc, ou ce capot 62 peut être constitué par un simple écran disposé en face des points chauds. Il ressort de l'exposé précédent, que le mouvement de rotation du couteau 28 introduit une disymétrie favorisant la coupure pour l'une des alternances du courant. En déportant les plots de contacts fixes 14,16 par rapport aux traversées 18,20, de la manière représentée à la figure 11, pour disposer les points de séparation des contacts 14,28;16,28 et les points d'amenée de courant aux plots de contacts 14,16 en des emplacements diamétralement opposés, cette disymétrie est évitée et les points cahés sont atteints quelle que soit l'alternance du courant.By avoiding according to the invention that the hot spots are facing each other at the time of cutting, the risks of non-recovery are low but they can be further reduced by providing, according to a development of the invention, confinement of these hot spots. In the variant illustrated in FIG. 9, the general structure of which corresponds to that illustrated in FIGS. 2 and 3, a cover 62 surrounds the pads of fixed contacts 14,16 in the vicinity of the hidden location 52,54. The cover 62 defines a corridor of small width allowing the penetration of the arc root and its migration to the hidden location 52, 54, while confining the electrons emitted by the hot spots in a space remote from the contacts. Hood 62 can wrap the fixed contact 14, 16 leaving only a slot for penetration of the arc, or this cover 62 can be constituted by a simple screen arranged opposite the hot spots. It emerges from the preceding description, that the rotational movement of the knife 28 introduces a asymmetry favoring cutting for one of the alternations of the current. By moving the fixed contact pads 14,16 with respect to the bushings 18,20, as shown in Figure 11, to arrange the separation points of the contacts 14,28; 16,28 and the current supply points at the contact pads 14, 16 at diametrically opposite locations, this asymmetry is avoided and the hidden points are reached whatever the alternation of the current.

L'invention est bien entendu applicable à d'autres types d'interrupteurs et plus particulièrement à un interrupteur ayant une enveloppe 10 ou cuve du type modulaire ou, une cuve métallique. L'interrupteur peut également comporter des contacts de mise à la terre portés par l'enveloppe 10 et coopérant avec le couteau 28 et les contacts 14,16,28 peuvent être du type à aboutement ou de tout autre constitution.The invention is of course applicable to other types of switches and more particularly to a switch having an enclosure 10 or tank of the modular type or, a metal tank. The switch may also include grounding contacts carried by the casing 10 and cooperating with the knife 28 and the contacts 14, 16, 28 may be of the abutment type or of any other constitution.

Claims (11)

1. Interrupteur rotatif moyenne tension à enveloppe étanche (10), dont le pourtour interne porte deux contacts fixes (14,16) diamétralement opposés, chaque contact fixe étant susceptible de coopérer avec un contact mobile (30,32) d'un pont de contacts pour former une paire de contacts, ledit pont de contacts en forme de couteau (28) pivotant étant porté par un arbre rotatif (22) de commande, qui peut occuper sélectivement une position de fermeture dans laquelle les deux paires de contacts (14,30;16,32) sont fermées et une position d'ouverture, caractérisé en ce que au moins l'un des contacts de l'une desdites paires comporte une piste (42) de migration de la racine (48,50) d'un arc (44,46), tiré lors de l'ouverture de la paire de contacts, que cette piste s'étend en direction opposée de l'autre contact de la paire, pour permettre le déplacement de la racine d'arc et du point chaud associé vers un emplacement caché (52,54;58) où les deux points chauds associés aux deux racines de l'arc ne sont pas en regard et qu'un aimant permanent (34) , solidaire du contact à piste de migration, est agencé pour souffler la racine de l'arc vers ledit emplacement caché (52,54;58) pour favoriser l'extinction de l'arc et la coupure du courant.1. Medium voltage rotary switch with sealed envelope (10), the inner periphery of which carries two fixed contacts (14,16) diametrically opposed, each fixed contact being capable of cooperating with a movable contact (30,32) of a bridge contacts to form a pair of contacts, said pivoting knife-shaped contact bridge (28) being carried by a rotary control shaft (22), which can selectively occupy a closed position in which the two pairs of contacts (14, 30; 16,32) are closed and an open position, characterized in that at least one of the contacts of one of said pairs includes a track (42) for migration of the root (48,50) of an arc (44,46), drawn during the opening of the pair of contacts, that this track extends in the opposite direction from the other contact of the pair, to allow the displacement of the arc root and the associated hot spot towards a hidden location (52,54; 58) where the two hot spots associated with the two roots of the arc are not facing each other and a permanent magnet (34), integral with the contact with migration path, is arranged to blow the root of the arc towards said hidden location (52, 54; 58) to promote the extinction of the arc and the power cut. 2. Interrupteur rotatif selon la revendication 1, caractérisé en ce que dans le plan de débattement du pont de contacts (28), la trace de ladite piste de migration (42) est une trajectoire courbe et que l'aimant permanent (34) est disposé à l'intérieur de ladite piste avec des lignes de champ agencées pour déplacer la racine d'arc sur ladite trajectoire.2. Rotary switch according to claim 1, characterized in that in the deflection plane of the contact bridge (28), the trace of said migration track (42) is a curved path and that the permanent magnet (34) is disposed inside said track with field lines arranged to move the arc root on said path. 3. Interrupteur rotatif selon la revendication 2, caractérisé en ce que le contact à piste de migration (42) est en forme de plot cylindrique d'axe parallèle audit arbre rotatif (22) de commande et qu'il comporte un aimant permanent (34) cylindrique logé à l'intérieur d'une gaine cylindrique (36) conductrice constituant la zone de contact et ladite piste.3. Rotary switch according to claim 2, characterized in that the contact with migration path (42) is in the form of a cylindrical stud of axis parallel to said rotary shaft (22) of control and that it comprises a permanent magnet (34 ) cylindrical housed inside a conductive cylindrical sheath (36) constituting the contact zone and said track. 4. Interrupteur rotatif selon la revendication 3, caractérisé en ce que la piste de migration est formée par la surface cylindrique de ladite gaine (36), qui s'étend du côté opposé à l'autre contact de ladite paire, et que les surfaces planes de la gaine sont coiffées au moins partiellement par un revêtement isolant (40) pour empêcher l'amorçage de l'arc sur ces surfaces planes.4. Rotary switch according to claim 3, characterized in that the migration path is formed by the cylindrical surface of said sheath (36), which extends on the side opposite to the other contact of said pair, and that the surfaces Sheath planes are capped at least partially by an insulating coating (40) to prevent arcing on these planar surfaces. 5. Interrupteur rotatif selon la revendication 3, caractérisé en ce que la piste de migration est formée par la périphérie des surfaces planes de la gaine cylindrique (36), et que la surface cylindrique est coiffée au moins partiellement par un revêtement isolant (56).5. Rotary switch according to claim 3, characterized in that the migration track is formed by the periphery of the flat surfaces of the cylindrical sheath (36), and that the cylindrical surface is covered at least partially by an insulating coating (56) . 6. Interrupteur rotatif selon l'une quelconque des revendications précédentes, caractérisé en ce que chaque paire de contacts (14,30;16,32), comporte un contact (14,16) équipé d'une piste de migration et d'un aimant permanent (34) de soufflage et que les polarités des aimants sont telles que les deux arcs (44,46) sont soufflés pendant la même alternance du courant vers lesdits emplacements cachés (52,54).6. Rotary switch according to any one of the preceding claims, characterized in that each pair of contacts (14.30; 16.32) comprises a contact (14.16) equipped with a migration track and a permanent magnet (34) for blowing and that the polarities of the magnets are such that the two arcs (44,46) are blown during the same alternation of the current to said hidden locations (52,54). 7. Interrupteur rotatif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que chaque paire de contacts (14,30;16,32) comporte un contact équipé d'une piste de migration et d'un aimant permanent (34) de soufflage et que les polarités des aimants sont telles que l'un des arcs est soufflé vers ledit emplacement caché pendant l'une des alternances du courant et l'autre des arcs pendant l'alternance opposée du courant.7. Rotary switch according to any one of claims 1 to 5, characterized in that each pair of contacts (14.30; 16.32) comprises a contact equipped with a migration track and a permanent magnet (34 ) of blowing and that the polarities of the magnets are such that one of the arcs is blown towards said hidden location during one of the alternations of the current and the other of the arcs during the opposite alternation of the current. 8. Interrupteur rotatif selon l'une quelconque des revendications précédentes, caractérisé en ce que un capot (62) coiffe la piste de migration dans la zone dudit emplacement caché (52,54), en laissant subsister un couloir d'entrée et de passage de l'arc vers cet emplacement caché.8. Rotary switch according to any one of the preceding claims, characterized in that a cover (62) covers the migration path in the area of said hidden location (52,54), leaving an entry and passage corridor from the arc to this hidden location. 9. Interrupteur rotatif selon l'une quelconque des revendications précédentes, caractérisé en ce que chacun desdits contacts est équipé d'une piste de migration et d'un aimant permanent.9. Rotary switch according to any one of the preceding claims, characterized in that each of said contacts is equipped with a migration track and a permanent magnet. 10. Interrupteur rotatif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'un (14) des contacts d'une paire de contacts comporte un aimant permanent (34) cylindrique d'axe perpendiculaire au plan de débattement du pont de contact (28), logé à l'intérieur d'une gaine cylindrique conductrice et que l'autre contact (30) de ladite paire est agencé en pince de contact venant enserrer en position fermée la bordure des deux faces latérales de ladite gaine cylindrique.10. Rotary switch according to any one of the preceding claims, characterized in that one (14) of the contacts of a pair of contacts comprises a permanent magnet (34) cylindrical with an axis perpendicular to the plane of movement of the bridge. contact (28), housed inside a conductive cylindrical sheath and that the other contact (30) of said pair is arranged in contact clamps enclosing in a closed position the edge of the two lateral faces of said cylindrical sheath. 11. Interrupteur rotatif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le point de fixation et d'amenée de courant au contact à piste de migration est diamétralement opposé au point de séparation des contacts (14,30;16,32) où se forme l'arc.11. Rotary switch according to any one of claims 1 to 6, characterized in that the point of fixing and supplying current to the contact with migration path is diametrically opposite to the point of separation of the contacts (14,30; 16 , 32) where the arc is formed.
EP88401386A 1987-06-25 1988-06-08 Rotating switch with curved arc-runner path Expired - Lifetime EP0296915B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88401386T ATE86787T1 (en) 1987-06-25 1988-06-08 ROTARY SWITCH WITH CURVED ARC TRACK.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8709009A FR2618251B1 (en) 1987-06-25 1987-06-25 ROTARY SWITCH WITH MIGRATION CURVE TRACK OF AN ARC ROOT.
FR8709009 1987-06-25

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Publication Number Publication Date
EP0296915A1 true EP0296915A1 (en) 1988-12-28
EP0296915B1 EP0296915B1 (en) 1993-03-10

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EP88401386A Expired - Lifetime EP0296915B1 (en) 1987-06-25 1988-06-08 Rotating switch with curved arc-runner path

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US (1) US4803319A (en)
EP (1) EP0296915B1 (en)
JP (1) JP2633305B2 (en)
CN (1) CN1016656B (en)
AT (1) ATE86787T1 (en)
AU (1) AU596061B2 (en)
BR (1) BR8803129A (en)
CA (1) CA1314918C (en)
DE (1) DE3879002T2 (en)
DK (1) DK171506B1 (en)
ES (1) ES2040364T3 (en)
FR (1) FR2618251B1 (en)
IN (1) IN171165B (en)
NO (1) NO173907C (en)
PT (1) PT87840B (en)
TR (1) TR23247A (en)
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EP0874380A1 (en) * 1997-04-25 1998-10-28 Soule Materiel Electrique Power cut-off device for low and high-tension
FR2944911A1 (en) * 2009-04-23 2010-10-29 Areva T & D Sa Electric switch-disconnector for use in lines of medium and high voltage electric energy transmission, has fixing contact fixed in displacement direction by resistor, where value of resistor changes according to position of mobile contact

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Cited By (4)

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FR2668851A1 (en) * 1990-11-06 1992-05-07 Merlin Gerin MULTIPOLAR ROTARY SWITCH.
EP0874380A1 (en) * 1997-04-25 1998-10-28 Soule Materiel Electrique Power cut-off device for low and high-tension
FR2762710A1 (en) * 1997-04-25 1998-10-30 Soule Materiel Electr ELECTRICAL SHUTDOWN DEVICE FOR LOW AND HIGH VOLTAGE
FR2944911A1 (en) * 2009-04-23 2010-10-29 Areva T & D Sa Electric switch-disconnector for use in lines of medium and high voltage electric energy transmission, has fixing contact fixed in displacement direction by resistor, where value of resistor changes according to position of mobile contact

Also Published As

Publication number Publication date
ZA884375B (en) 1989-02-22
BR8803129A (en) 1989-02-08
DK351188D0 (en) 1988-06-24
PT87840A (en) 1989-05-31
YU47469B (en) 1995-10-03
NO173907C (en) 1994-02-16
YU119688A (en) 1991-02-28
NO882747D0 (en) 1988-06-21
DK171506B1 (en) 1996-12-02
AU1836388A (en) 1989-01-05
PT87840B (en) 1993-09-30
FR2618251A1 (en) 1989-01-20
AU596061B2 (en) 1990-04-12
NO173907B (en) 1993-11-08
ATE86787T1 (en) 1993-03-15
FR2618251B1 (en) 1989-11-17
JP2633305B2 (en) 1997-07-23
TR23247A (en) 1989-07-21
DE3879002D1 (en) 1993-04-15
IN171165B (en) 1992-08-08
DE3879002T2 (en) 1993-09-16
JPS6419639A (en) 1989-01-23
CN1016656B (en) 1992-05-13
EP0296915B1 (en) 1993-03-10
US4803319A (en) 1989-02-07
NO882747L (en) 1988-12-27
ES2040364T3 (en) 1993-10-16
DK351188A (en) 1988-12-26
CA1314918C (en) 1993-03-23
CN1034633A (en) 1989-08-09

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