EP0011542B1 - Circuit breaker with separated main and shunt current paths - Google Patents

Circuit breaker with separated main and shunt current paths Download PDF

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Publication number
EP0011542B1
EP0011542B1 EP79400819A EP79400819A EP0011542B1 EP 0011542 B1 EP0011542 B1 EP 0011542B1 EP 79400819 A EP79400819 A EP 79400819A EP 79400819 A EP79400819 A EP 79400819A EP 0011542 B1 EP0011542 B1 EP 0011542B1
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EP
European Patent Office
Prior art keywords
contacts
arcing
main
circuit
circuit breaker
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Expired
Application number
EP79400819A
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German (de)
French (fr)
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EP0011542A1 (en
EP0011542B2 (en
Inventor
Jean-Louis Mircovich
Marcel Macaire
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Merlin Gerin SA
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Merlin Gerin SA
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Application filed by Merlin Gerin SA filed Critical Merlin Gerin SA
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Publication of EP0011542B1 publication Critical patent/EP0011542B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H33/121—Load break switches
    • H01H33/122—Load break switches both breaker and sectionaliser being enclosed, e.g. in SF6-filled container
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas

Definitions

  • a known circuit breaker of the kind mentioned (publication US-A-3,671,696) has arcing contacts housed in a vacuum interrupter interposed between the inlet and outlet bushings.
  • a disconnector is connected in parallel with the vacuum interrupter and the assembly is arranged in a box filled with air.
  • the main circuit containing the disconnector is removed from the auxiliary circuit for housing the vacuum interrupter and forms a reactance loop significantly greater than that of the loop of the auxiliary circuit, preventing rapid switching from the main circuit to the auxiliary circuit. when opening the disconnector.
  • the main circuit is longer than the auxiliary circuit, which increases the resistance and overheating of the circuit breaker and affects the distribution of current between the two circuits.
  • the switch is placed in the air and the separation distance between the open contacts must be sufficient for the insulation. This results in a large opening travel and a significant drive control energy.
  • the size of the cabinet is a multiple of that of the vacuum interrupter.
  • the object of the present invention is to remedy these drawbacks and to allow the production of a self-blowing circuit breaker with quasi-independent main and auxiliary circuits, in which the reactances of these circuits are substantially equal in order to facilitate rapid switching of the current.
  • the circuit breaker is characterized in that it is housed in a sealed insulating envelope, filled with an insulating gas with high dielectric strength, in particular sulfur hexafluoride, surrounding said main contacts and said arcing contacts, and that the main circuit is connected directly to said terminals by extending along a path directly adjacent and shorter than that of the auxiliary circuit between said terminals inside said envelope.
  • an insulating gas with high dielectric strength in particular sulfur hexafluoride
  • the invention starts from the observation of the interest of the separation of the functions of conduction of the permanent current and that of cut of the current, in particular of fault.
  • the main circuit provides the first function and the length, and the cross section of the conductors and the structure of the contacts are chosen for this purpose.
  • the second function is provided by the auxiliary circuit on which the current is switched when the main contacts are separated.
  • Self-blowing circuit breakers are known (publication US-A-3257532, publication FR-A-1458 334), provided with arcing contacts and main contacts arranged circumferentially around the arcing contacts.
  • the reactances of the two circuits are almost identical, which facilitates switching, but risks of interaction of the cuts are not excluded, the moving part carries the two moving contacts and the inertia of the assembly is opposed to a quick order.
  • a pole of the self-blowing circuit breaker comprises a sealed casing 10 filled with insulating gas with high dielectric strength, in particular sulfur hexafluoride.
  • the casing 10 made of molded insulating material, is closed by a cover 12 and serves as a housing for a main circuit 14 for passing the nominal current, an auxiliary circuit 16 for shunting the main circuit for breaking the arc, a mechanism control 18 of the movable assembly for the successive opening of the main 14 and auxiliary 16 circuits, and two terminals 20, 22 for supplying current constituted by crossings of the wall of the insulating casing 10 offset longitudinally.
  • the main circuit 14 comprises a movable main contact 24 provided with a plurality of pairs of fingers 26a, 26b, 26c, 26d ..., articulated on a fixed axis 28 secured to a first conductor 30 for connection with the lower terminal 22
  • An elastic means, in particular a compression spring 32 is associated with each pair to urge the corresponding fingers towards one another, so as to form a clamp cooperating in the closed position of the main circuit 14 with an extension 34, 36 a fixed main contact 38.
  • the latter is electrically connected to the upper terminal 20 by a second connecting conductor 40.
  • the tightening of the fingers 26a, 26b; 26c, 26d on the corresponding extension 34, 36 is reinforced by the electrodynamic attraction exerted between said fingers of each pair traversed by currents of the same direction.
  • the auxiliary circuit 16 connected in parallel to the main circuit 14 inside the casing 10, comprises aligned arcing contacts, one of which is fixed 42 is connected to the upper terminal 20, and the other of which is movable 44 is integral with a conductive rod 46 coupled to a control crank 48.
  • the external actuation mechanism transmits the movement to the crank 48 by means of a rotary transmission shaft 50 passing through the wall of the casing 10 with the interposition of a sealed bearing 52.
  • An electrical connection with relative movement, in particular a flexible shunt conductor 54 is arranged in the auxiliary circuit 16 between the rod 46 and the lower terminal 22.
  • An intermediate partition 56 parallel to the bottom 58 and to the cover 12 of the pole, divides the internal space of the envelope 10 into two separate compartments 60, 62 superimposed.
  • the lower compartment 60 contains the main contacts 24, 38, and the upper compartment 62 contains the cut-off interval 64 formed between the arcing contacts 42, 44 in the separate position.
  • the physical separation between the main contact interruption zone and the cut-off interval 64 avoids any risk of re-striking the arc in the vicinity of said zone as a result of polluted hot gases coming from the cut.
  • the current supply terminals 20, 22 form bypass nodes of the two main 14 and auxiliary 16 circuits, and the shunt conductor 54 is traversed exclusively by the fault current.
  • the two circuits 14, 16 extend parallel to the interior of the envelope 10 with a slight transverse offset, so as to form a loop of low reactance, the circuit 14 following the shortest path.
  • the self-blowing device 66 of a type well known to specialists is arranged in the upper compartment 62 and comprises a movable piston 68 secured to the rod 46.
  • the piston 68 carries a blowing nozzle 70 coaxially surrounding the arcing contacts 42 , 44 in the closed position, and cooperates with limited sliding with a fixed cylinder 72 to delimit a pistonable volume 74 for compressing the insulating gas.
  • a flow of blowing gas is expelled through openings 76 provided in the piston 68 in the convergent of the nozzle 70, towards the cut-off interval 64 for the extinction of the arc.
  • the actuation mechanism comprises a kinematic link 78 mechanically connecting the rod 46 of the arcing contact 44 to the main movable contact 24 to transform the rectilinear movement of the rod 46 into a pivoting movement of the contact 24 during the stroke of the mobile equipment of the circuit breaker.
  • This kinematic link 78 is provided with a transmission lever 80 secured to the fingers 26 and cooperating at its opposite end with a drive pin 82 attached to the rod 46.
  • the stroke of the clamps of the main movable contact 24 is different and in particular shorter than that of the movable arcing contact 44.
  • the actuation mechanism After detecting a fault current on the network to be protected, the actuation mechanism causes the downward axial translation (in the direction of the arrow F) of the rod 46 and the pivoting of the lever 80 clockwise causing the opening of the main contacts 24, 38, and the switching of the current in the auxiliary shunt circuit 16.
  • the fault current path is then as follows: upper terminal 20, fixed arcing contact 42, movable arcing contact 44, rod 46, shunt conductor 54, conductor 30, lower terminal 22.
  • the crew's continued race mobile causes the separation of the arcing contacts 42, 44 and the blowing of extinguishing gas from the arcing.
  • the cutting zone 64 is physically separated from the main contacts 38, 24, in particular by the partition 56 and prevents any re-ignition of the arc between said main contacts.
  • the arcing contacts 42, 44 can close first or, on the contrary, after the main contacts 24, 38 close, depending on the desired operating conditions.
  • the control device is of course arranged accordingly.
  • the main movable contact 24 could also be arranged in the form of a bridge actuated in radial or axial translation by the kinematic link 78 during the axial displacement of the rod 46.
  • the invention is applicable to a circuit breaker with pneumatic self-blowing, with magnetic self-blowing or with combined magnetic and pneumatic self-blowing.

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

Description

L'invention est relative à un disjoncteur électrique ayant une enveloppe contenant:

  • - un circuit principal de passage du courant ayant une paire de contacts principaux dont l'un est mobile,
  • - un circuit auxiliaire de shuntage du circuit principal, disposé au voisinage de ce dernier et ayant une paire de contacts d'arc dont l'un est mobile,
  • - un mécanisme de commande desdits contacts mobiles pour séparer lesdits contacts principaux avant la séparation desdits contacts d'arc,
  • - une paire de traversées traversant la paroi de ladite enveloppe et constituant une borne d'entrée et une borne de sortie du disjoncteur.
The invention relates to an electrical circuit breaker having an enclosure containing:
  • - a main current flow circuit having a pair of main contacts, one of which is movable,
  • an auxiliary circuit for shunting the main circuit, disposed in the vicinity of the latter and having a pair of arcing contacts, one of which is movable,
  • a mechanism for controlling said movable contacts to separate said main contacts before the separation of said arcing contacts,
  • - A pair of bushings crossing the wall of said envelope and constituting an input terminal and an output terminal of the circuit breaker.

Un disjoncteur connu du genre mentionné (publication US-A-3 671 696) comporte des contacts d'arc logés dans une ampoule à vide intercalée entre les traversées d'entrée et de sortie. Un sectionneur est connecté en parallèle de l'ampoule à vide et l'ensemble est disposé dans un coffret rempli d'air. Le circuit principal contenant le sectionneur est écarté du circuit auxiliaire pour le logement de l'ampoule à vide et forme une boucle de réactance notablement supérieure à celle de la boucle du circuit auxiliaire, s'opposant à une commutation rapide du circuit principal au circuit auxiliaire lors de l'ouverture du sectionneur. Le circuit principal est plus long que le circuit auxiliaire, ce qui augmente la résistance et l'échauffement du disjoncteur et affecte la répartition du courant entre les deux circuits. Le sectionneur est disposé dans l'air et la distance de séparation des contacts ouverts doit être suffisante à l'isolation. Il en résulte une course d'ouverture importante et une énergie de commande du sectionneur non négligeable. L'encombrement du coffret est un multiple de celui de l'ampoule à vide.A known circuit breaker of the kind mentioned (publication US-A-3,671,696) has arcing contacts housed in a vacuum interrupter interposed between the inlet and outlet bushings. A disconnector is connected in parallel with the vacuum interrupter and the assembly is arranged in a box filled with air. The main circuit containing the disconnector is removed from the auxiliary circuit for housing the vacuum interrupter and forms a reactance loop significantly greater than that of the loop of the auxiliary circuit, preventing rapid switching from the main circuit to the auxiliary circuit. when opening the disconnector. The main circuit is longer than the auxiliary circuit, which increases the resistance and overheating of the circuit breaker and affects the distribution of current between the two circuits. The switch is placed in the air and the separation distance between the open contacts must be sufficient for the insulation. This results in a large opening travel and a significant drive control energy. The size of the cabinet is a multiple of that of the vacuum interrupter.

La présente invention a pour but de remédier à ces inconvénients et de permettre la réalisation d'un disjoncteur à autosoufflage à circuits principal et auxiliaire quasi-indépendants, dans lequel les réactances de ces circuits sont sensiblement égales afin de faciliter la commutation rapide du courant.The object of the present invention is to remedy these drawbacks and to allow the production of a self-blowing circuit breaker with quasi-independent main and auxiliary circuits, in which the reactances of these circuits are substantially equal in order to facilitate rapid switching of the current.

Le disjoncteur est caractérisé en ce qu'il est logé dans une enveloppe étanche isolante, remplie d'un gaz isolant à rigidité diélectrique élevée, notamment de l'hexafluorure de soufre, entourant lesdits contacts principaux et lesdits contacts d'arc, et que le circuit principal est connecté directement auxdites bornes en s'étendant suivant une trajectoire directement adjacente et plus courte que celle du circuit auxiliaire entre lesdites bornes à l'intérieur de ladite enveloppe.The circuit breaker is characterized in that it is housed in a sealed insulating envelope, filled with an insulating gas with high dielectric strength, in particular sulfur hexafluoride, surrounding said main contacts and said arcing contacts, and that the main circuit is connected directly to said terminals by extending along a path directly adjacent and shorter than that of the auxiliary circuit between said terminals inside said envelope.

L'invention part de la constatation de l'intérét de la séparation des fonctions de conduction du courant permanent et de celle de coupure du courant, notamment de défaut. Le circuit principal assure la première fonction et la longueur, et la section des conducteurs ainsi que la structure des contacts sont choisies à cet effet. La deuxième fonction est assurée par le circuit auxiliaire sur lequel le courant est commuté lors de la séparation des contacts principaux.The invention starts from the observation of the interest of the separation of the functions of conduction of the permanent current and that of cut of the current, in particular of fault. The main circuit provides the first function and the length, and the cross section of the conductors and the structure of the contacts are chosen for this purpose. The second function is provided by the auxiliary circuit on which the current is switched when the main contacts are separated.

On connaît des disjoncteurs à autosoufflage (publication US-A-3257532, publication FR-A-1458 334), dotés de contacts d'arc et de contacts principaux disposés circonférentiellement autour des contacts d'arc. Les réactances des deux circuits sont quasi-identiques, ce qui facilite la commutation, mais des risques d'interaction des coupures ne sont pas exclus, l'équipage mobile porte les deux contacts mobiles et l'inertie de l'ensemble s'oppose à une commande rapide.Self-blowing circuit breakers are known (publication US-A-3257532, publication FR-A-1458 334), provided with arcing contacts and main contacts arranged circumferentially around the arcing contacts. The reactances of the two circuits are almost identical, which facilitates switching, but risks of interaction of the cuts are not excluded, the moving part carries the two moving contacts and the inertia of the assembly is opposed to a quick order.

Il a d'autre part déjà été proposé (publication FR-A-1 302 499) de loger à l'intérieur de l'enveloppe d'un interrupteur à autosoufflage des contacts auxiliaires d'insertion de résistances pour limiter les tensions de rétablissement. La fraction du courant dérivé sur les contacts auxiliaires est faible et les contacts principaux sont soumis à l'action de l'arc.On the other hand, it has already been proposed (publication FR-A-1 302 499) to house inside the envelope of a self-blowing switch auxiliary contacts for inserting resistors to limit the recovery voltages. The fraction of the derivative current on the auxiliary contacts is low and the main contacts are subjected to the action of the arc.

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

  • la fig. 1 est une vue schématique en élévation et en coupe verticale d'un disjoncteur à autosoufflage équipé d'un dispositif à contacts principaux selon l'invention;
  • la fig. 2 est une coupe partielle selon la ligne 11-11 de la fig. 1, en position de fermeture des contacts principaux.
Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment of the invention, given by way of nonlimiting example and represented in the appended drawings, in which:
  • fig. 1 is a schematic view in elevation and in vertical section of a self-blowing circuit breaker equipped with a device with main contacts according to the invention;
  • fig. 2 is a partial section along line 11-11 of FIG. 1, in the closed position of the main contacts.

Sur les figures, un pôle du disjoncteur à autosoufflage comporte une enveloppe 10 étanche remplie de gaz isolant à haute rigidité diélectrique, notamment de l'hexafluorure de soufre. L'enveloppe 10, en matériau isolant moulé, est obturée par un couvercle 12 et sert de logement à un circuit principal 14 de passage du courant nominal, un circuit auxiliaire 16 de shuntage du circuit principal pour la coupure de l'arc, un mécanisme de commande 18 de l'équipage mobile pour l'ouverture successive des circuits principal 14 et auxiliaire 16, et deux bornes 20, 22 d'amenée de courant constituées par des traversées de la paroi de l'enveloppe 10 isolante décalées longitudinalement.In the figures, a pole of the self-blowing circuit breaker comprises a sealed casing 10 filled with insulating gas with high dielectric strength, in particular sulfur hexafluoride. The casing 10, made of molded insulating material, is closed by a cover 12 and serves as a housing for a main circuit 14 for passing the nominal current, an auxiliary circuit 16 for shunting the main circuit for breaking the arc, a mechanism control 18 of the movable assembly for the successive opening of the main 14 and auxiliary 16 circuits, and two terminals 20, 22 for supplying current constituted by crossings of the wall of the insulating casing 10 offset longitudinally.

Le circuit principal 14 comprend un contact principal mobile 24 doté d'une pluralité de paires de doigts 26a, 26b, 26c, 26d ..., articulés sur un axe 28 fixe solidaire d'un premier conducteur 30 de liaison avec la borne inférieure 22. Un moyen élastique, notamment un ressort de compression 32 est associé à chaque paire pour solliciter les doigts correspondants l'un vers l'autre, de manière à former une pince coopérant en position de fermeture du circuit principal 14 avec une extension 34, 36 d'un contact principal fixe 38. Ce dernier est relié électriquement à la borne supérieure 20 par un deuxième conducteur 40 de liaison. En position de fermeture le serrage des doigts 26a, 26b; 26c, 26d sur l'extension 34, 36 correspondante est renforcé par l'attraction électrodynamique s'exerçant entre lesdits doigts de chaque paire parcourus par des courants de même sens.The main circuit 14 comprises a movable main contact 24 provided with a plurality of pairs of fingers 26a, 26b, 26c, 26d ..., articulated on a fixed axis 28 secured to a first conductor 30 for connection with the lower terminal 22 An elastic means, in particular a compression spring 32 is associated with each pair to urge the corresponding fingers towards one another, so as to form a clamp cooperating in the closed position of the main circuit 14 with an extension 34, 36 a fixed main contact 38. The latter is electrically connected to the upper terminal 20 by a second connecting conductor 40. In the closed position, the tightening of the fingers 26a, 26b; 26c, 26d on the corresponding extension 34, 36 is reinforced by the electrodynamic attraction exerted between said fingers of each pair traversed by currents of the same direction.

Le circuit auxiliaire 16, branché en parallèle au circuit principal 14 à l'intérieur de-l'enveloppe 10, comporte des contacts d'arc alignés dont l'un fixe 42 est relié à la borne supérieure 20, et dont l'autre mobile 44 est solidaire d'une tige 46 conductrice accouplée à une manivelle 48 de commande. Le mécanisme d'actionnement extérieur transmet le mouvement à la manivelle 48 par l'intermédiaire d'un arbre 50 de transmission rotatif traversant la paroi de l'enveloppe 10 avec interposition d'un palier étanche 52. Une liaison électrique à mouvement relatif, notamment un conducteur shunt 54 flexible, est agencée dans le circuit auxiliaire 16 entre la tige 46 et la borne inférieure 22.The auxiliary circuit 16, connected in parallel to the main circuit 14 inside the casing 10, comprises aligned arcing contacts, one of which is fixed 42 is connected to the upper terminal 20, and the other of which is movable 44 is integral with a conductive rod 46 coupled to a control crank 48. The external actuation mechanism transmits the movement to the crank 48 by means of a rotary transmission shaft 50 passing through the wall of the casing 10 with the interposition of a sealed bearing 52. An electrical connection with relative movement, in particular a flexible shunt conductor 54 is arranged in the auxiliary circuit 16 between the rod 46 and the lower terminal 22.

Une cloison 56 intermédiaire, parallèle au fond 58 et au couvercle 12 du pôle, partage l'espace interne de l'enveloppe 10 en deux compartiments 60, 62 distincts superposés. Le compartiment inférieur 60 renferme les contacts principaux 24, 38, et le compartiment supérieur 62 contient l'intervalle de coupure 64 ménagé entre les contacts d'arc 42, 44 en position séparée. La séparation physique entre la zone d'interruption des contacts principaux et l'intervalle de coupure 64 évite tout risque de réamorçage de l'arc au voisinage de ladite zone par suite de gaz chauds pollués provenant de la coupure.An intermediate partition 56, parallel to the bottom 58 and to the cover 12 of the pole, divides the internal space of the envelope 10 into two separate compartments 60, 62 superimposed. The lower compartment 60 contains the main contacts 24, 38, and the upper compartment 62 contains the cut-off interval 64 formed between the arcing contacts 42, 44 in the separate position. The physical separation between the main contact interruption zone and the cut-off interval 64 avoids any risk of re-striking the arc in the vicinity of said zone as a result of polluted hot gases coming from the cut.

Les bornes 20, 22 d'amenée de courant forment des noeuds de dérivation des deux circuits principal 14 et auxiliaire 16, et le conducteur shunt 54 est parcouru exclusivement par le courant de défaut. Les deux circuits 14, 16 s'étendent paralléle- ment à l'intérieur de l'enveloppe 10 avec un faible décalage transversal, de manière à former une boucle de faible réactance, le circuit 14 suivant la plus courte trajectoire.The current supply terminals 20, 22 form bypass nodes of the two main 14 and auxiliary 16 circuits, and the shunt conductor 54 is traversed exclusively by the fault current. The two circuits 14, 16 extend parallel to the interior of the envelope 10 with a slight transverse offset, so as to form a loop of low reactance, the circuit 14 following the shortest path.

Le dispositif d'autosoufflage 66 d'un type bien connu des spécialistes est agencé dans le compartiment supérieur 62 et comprend un piston 68 mobile assujetti à la tige 46. Le piston 68 porte une buse de soufflage 70 entourant coaxialement les contacts d'arc 42, 44 en position de fermeture, et coopère à coulissement limité avec un cylindre 72 fixe pour délimiter un volume 74 pistonnable de compression du gaz isolant. Lors de la séparation des contacts d'arc 42, 44, un écoulement de gaz de soufflage est chassé par des ouvertures 76 prévues dans le piston 68 dans le convergent de la buse 70, vers l'intervalle de coupure 64 pour l'extinction de l'arc.The self-blowing device 66 of a type well known to specialists is arranged in the upper compartment 62 and comprises a movable piston 68 secured to the rod 46. The piston 68 carries a blowing nozzle 70 coaxially surrounding the arcing contacts 42 , 44 in the closed position, and cooperates with limited sliding with a fixed cylinder 72 to delimit a pistonable volume 74 for compressing the insulating gas. During the separation of the arcing contacts 42, 44, a flow of blowing gas is expelled through openings 76 provided in the piston 68 in the convergent of the nozzle 70, towards the cut-off interval 64 for the extinction of the arc.

Le mécanisme d'actionnement comporte une liaison cinématique 78 reliant mécaniquement la tige 46 du contact d'arc 44 au contact-mobile principal 24 pour transformer le mouvement rectiligne de la tige 46 en un mouvement de pivotement du contact 24 lors de la course de l'équipage mobile du disjoncteur. Cette liaison cinématique 78 est dotée d'un levier de transmission 80 assujetti aux doigts 26 et coopérant par son extrémité opposée avec un tourillon 82 d'entraînement fixé sur la tige 46. La course des pinces du contact mobile principal 24 est différente et en particulier plus courte que celle du contact d'arc mobile 44.The actuation mechanism comprises a kinematic link 78 mechanically connecting the rod 46 of the arcing contact 44 to the main movable contact 24 to transform the rectilinear movement of the rod 46 into a pivoting movement of the contact 24 during the stroke of the mobile equipment of the circuit breaker. This kinematic link 78 is provided with a transmission lever 80 secured to the fingers 26 and cooperating at its opposite end with a drive pin 82 attached to the rod 46. The stroke of the clamps of the main movable contact 24 is different and in particular shorter than that of the movable arcing contact 44.

Le fonctionnement du disjoncteur selon les figures 1 et 2 découle de la description précédente, et il suffit de rappeler qu'en position de fermeture du disjoncteur, le courant nominal circule dans le circuit principal 14 dont la résistance électrique est inférieure à celle du circuit auxiliaire 16. Le trajet du courant est le suivant: borne supérieure 20, conducteur de liaison 40, contact principal fixe 38, contact principal mobile 24 (représenté en pointillé, fig. 1), conducteur de liaison 30, borne inférieure 22. Aucun courant notable ne circule dans le shunt 54.The operation of the circuit breaker according to Figures 1 and 2 follows from the preceding description, and it suffices to recall that in the closed position of the circuit breaker, the nominal current flows in the main circuit 14 whose electrical resistance is lower than that of the auxiliary circuit 16. The current path is as follows: upper terminal 20, connecting conductor 40, fixed main contact 38, movable main contact 24 (shown in dotted lines, fig. 1), connecting conductor 30, lower terminal 22. No significant current does not circulate in shunt 54.

Après détection d'un courant de défaut sur le réseau à protéger, le mécanisme d'actionnement provoque la translation axiale vers le bas (selon le sens de la flèche F) de la tige 46 et le pivotement du levier 80 dans le sens horaire entraînant l'ouverture des contacts principaux 24, 38, et la commutation du courant dans le circuit auxiHaire 16 de shuntage. Le trajet du courant de défaut est alors le suivant: borne supérieure 20, contact d'arc fixe 42, contact d'arc mobile 44, tige 46, conducteur shunt 54, conducteur 30, borne inférieure 22. La course poursuivie de l'équipage mobile provoque la séparation des contacts d'arc 42, 44 et le soufflage de gaz d'extinction de l'arc. La zone de coupure 64 est séparée physiquement des contacts principaux 38, 24, notamment par la cloison 56 et empêche tout réamorçage de l'arc entre lesdits contacts principaux.After detecting a fault current on the network to be protected, the actuation mechanism causes the downward axial translation (in the direction of the arrow F) of the rod 46 and the pivoting of the lever 80 clockwise causing the opening of the main contacts 24, 38, and the switching of the current in the auxiliary shunt circuit 16. The fault current path is then as follows: upper terminal 20, fixed arcing contact 42, movable arcing contact 44, rod 46, shunt conductor 54, conductor 30, lower terminal 22. The crew's continued race mobile causes the separation of the arcing contacts 42, 44 and the blowing of extinguishing gas from the arcing. The cutting zone 64 is physically separated from the main contacts 38, 24, in particular by the partition 56 and prevents any re-ignition of the arc between said main contacts.

A la fermeture du disjoncteur, les contacts d'arc 42, 44 peuvent se fermer en premier ou au contraire après la fermeture des contacts principaux 24, 38 selon les conditions de fonctionnement souhaitées. Le dispositif de commande est bien entendu agencé en conséquence.
Le contact mobile principal 24 pourrait aussi être agencé en forme de pont actionné en translation radiale ou axiale par la liaison cinématique 78 lors du déplacement axial de la tige 46.When the circuit breaker closes, the arcing contacts 42, 44 can close first or, on the contrary, after the main contacts 24, 38 close, depending on the desired operating conditions. The control device is of course arranged accordingly.
The main movable contact 24 could also be arranged in the form of a bridge actuated in radial or axial translation by the kinematic link 78 during the axial displacement of the rod 46.

L'invention est applicable à un disjoncteur à autosoufflage pneumatique, à autosoufflage magnétique ou à autosoufflage magnétique et pneumatique combiné.The invention is applicable to a circuit breaker with pneumatic self-blowing, with magnetic self-blowing or with combined magnetic and pneumatic self-blowing.

Claims (8)

1. Electrical circuit breaker having a housing (10) including:
- a main circuit (14) having a pair of main contacts (24, 38), one (24) of said contacts being movable,
- an auxiliary arcing circuit (16) for bypassing said main circuit (14) arranged close to said arcing circuit comprising a pair of arcing contacts (42, 44), one (44) of said arcing contacts being movable,
- an operating mechanism (46, 48, 50, 80) coupled to said movable contacts (24, 44) so as to open said main contacts (24, 38) before the arcing contacts (42, 44),
- a pair of bushings (20,22) extending through the wall of said housing (10), so as to form an input terminal and an output terminal of the circuit breaker,

characterized in that the gas-blast circuit breaker is mounted within a tight housing (10) of insulating material filled with an insulating gas of high dielectric strength such as sulfur hexafluoride, which surrounds said main contacts (24, 38) and said arcing contacts (42, 44), and that the main circuit (14) is directly connected to said terminals (20, 22), extending along a path which is contiguous to the path of the arcing circuit (16) arranged within said housing between the terminals (20, 22), the path of the main circuit being shorter than the path of the arcing circuit.
2. Circuit breaker according to claim 1, characterized in that said housing (10) has an elongated configuration, said movable arcing contact (44) being actuated along the longitudinal direction of the housing and that said bushings (20, 22) are longitudinally spaced and electrically connected by a rectilinear main circuit extending along the longitudinal direction of the housing (10) so as to form a reactance loop which is near the reactance loop of the arcing circuit (16).
3. Circuit breaker according to claim 1 or 2, characterized in that the interrupting zone of said main contacts (24,38) is spaced from the interrupting zone of said arcing contacts (42, 44) and that an inner partition wall is arranged between said zones so as to avoid an interaction of the main and arcing current breakings.
4. Circuit breaker according to any one of the previous claims, characterized in that a cinematic linkage (82, 80) is coupled to the movable contacts (24, 44) so as to open the main contacts (24, 38) before the arcing contacts (42, 44), the opening stroke of the main contacts being smaller than the opening distance of the arcing contacts (42, 44).
5. Circuit breaker according to claim 4, characterized in that said main contacts (24, 38) comprise a pivoting movable main contact which comes into alignment with the main circuit in the closed circuit position, the pivoting movement of said contact being derived from the rectilinear movement of an actuating rod (46) secured to the movable arcing contact (44).
6. Circuit breaker according to any one of the previous claims, characterized in that a puffer cylinder (72) piston (68) unit is associated to said arcing contacts (42, 44), and is actuated by the displacement of the movable arcing contact (44) so as to ensure a gas-blast at the opening of the arcing contacts.
7. Circuit breaker according to any one of the previous claims 1 to 5, characterized in that magnetic means produces a magnetic arc-extinguishing field between the arcing contacts (42, 44).
8. Circuit breaker according to claims 6 and 7, characterized in that it comprises combined magnetic and gas-blast arc-extinguishing devices.
EP79400819A 1978-11-14 1979-11-05 Circuit breaker with separated main and shunt current paths Expired EP0011542B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7832214A FR2441916A1 (en) 1978-11-14 1978-11-14 SELF-BLOWING ELECTRIC CIRCUIT BREAKER EQUIPPED WITH A DEVICE WITH IMPROVED MAIN CONTACTS
FR7832214 1978-11-14

Publications (3)

Publication Number Publication Date
EP0011542A1 EP0011542A1 (en) 1980-05-28
EP0011542B1 true EP0011542B1 (en) 1983-07-20
EP0011542B2 EP0011542B2 (en) 1988-02-10

Family

ID=9214898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79400819A Expired EP0011542B2 (en) 1978-11-14 1979-11-05 Circuit breaker with separated main and shunt current paths

Country Status (6)

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US (1) US4309581A (en)
EP (1) EP0011542B2 (en)
JP (1) JPS5568021A (en)
CS (1) CS231167B2 (en)
DE (1) DE2965950D1 (en)
FR (1) FR2441916A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2494493A1 (en) * 1980-11-17 1982-05-21 Merlin Gerin ELECTRIC CIRCUIT BREAKER WITH SELF-BLOWING BY ARC ROTATION
DE3513264A1 (en) * 1985-03-12 1986-09-18 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Gas-blast circuit breaker
FR2596576B1 (en) * 1986-03-26 1988-05-27 Merlin Gerin SELF-BLOWING ELECTRIC CIRCUIT BREAKER WITH IMPROVED DIELECTRIC HOLD
FR2596915B1 (en) * 1986-04-03 1994-02-18 Merlin Et Gerin SELF-BLOWING ELECTRIC CIRCUIT BREAKER HAVING HIGH DIELECTRIC HOLD
US5059753A (en) * 1987-11-06 1991-10-22 Cooper Industries, Inc. SF6 puffer recloser
FR2631735B1 (en) * 1988-05-17 1990-07-27 Merlin Gerin ADJUSTING DEVICE OF A MEDIUM VOLTAGE ELECTRIC SWITCH
FR2641898B1 (en) * 1989-01-17 1991-03-15 Merlin Gerin SELF-BLOWING ELECTRIC CIRCUIT BREAKER
FR2647254B1 (en) * 1989-05-19 1991-07-05 Alsthom Gec MEDIUM VOLTAGE CIRCUIT BREAKER AT HIGH RATED CURRENT
FR2660792B1 (en) * 1990-04-04 1992-06-12 Alsthom Gec HIGH OR MEDIUM VOLTAGE CIRCUIT BREAKER WITH ARC-TO-END CONTACTORS.
FR2677168B1 (en) * 1991-06-03 1994-06-17 Merlin Gerin MEDIUM VOLTAGE CIRCUIT BREAKER WITH REDUCED CONTROL ENERGY.
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Also Published As

Publication number Publication date
DE2965950D1 (en) 1983-08-25
FR2441916A1 (en) 1980-06-13
EP0011542A1 (en) 1980-05-28
FR2441916B1 (en) 1981-10-02
JPH0139171B2 (en) 1989-08-18
CS231167B2 (en) 1984-10-15
CS761579A2 (en) 1984-02-13
EP0011542B2 (en) 1988-02-10
US4309581A (en) 1982-01-05
JPS5568021A (en) 1980-05-22

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