EP0789380A1 - Operating mechanism for a circuit breaker with a latch disengageable by a short circuit - Google Patents

Operating mechanism for a circuit breaker with a latch disengageable by a short circuit Download PDF

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Publication number
EP0789380A1
EP0789380A1 EP97410012A EP97410012A EP0789380A1 EP 0789380 A1 EP0789380 A1 EP 0789380A1 EP 97410012 A EP97410012 A EP 97410012A EP 97410012 A EP97410012 A EP 97410012A EP 0789380 A1 EP0789380 A1 EP 0789380A1
Authority
EP
European Patent Office
Prior art keywords
pawl
opening pawl
opening
control mechanism
hook
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
EP97410012A
Other languages
German (de)
French (fr)
Other versions
EP0789380B1 (en
Inventor
Jean-Pierre Nebon
Claude Grelier
Marc Rival
Eric Pinero
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric SE
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 Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0789380A1 publication Critical patent/EP0789380A1/en
Application granted granted Critical
Publication of EP0789380B1 publication Critical patent/EP0789380B1/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
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/101—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening with increasing of contact pressure by electrodynamic forces before opening
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/505—Latching devices between operating and release mechanism
    • H01H2071/507—Latching devices between operating and release mechanism being collapsible, e.g. yielding elastically, when the opening force is higher than a predetermined value

Definitions

  • a mechanism of the kind mentioned is described in document EP-A-222,645 of the applicant.
  • the electrodynamic resistance of the circuit breaker results from the action of the contact pressure springs on the multiple fingers, and of the compensated contacts, the hinge axis of which is subjected to significant mechanical reactions.
  • the mechanism is capable of absorbing these reactions for a maximum threshold of short-circuit current. Beyond this threshold, the reactions are liable to damage certain axes or transmission members of the mechanism, and risk increasing the tripping force at the level of the stage comprising the hook, the opening pawl, and the lock. Intervention of the trigger instantaneous requires a response time of the order of 10 ms to obtain tripping of the mechanism, which is too long if the circuit breaker performance must satisfy high electrodynamic resistance, and a breaking capacity greater than 130kA.
  • the object of the invention consists in making a circuit breaker with high electrodynamic resistance, and with high breaking capacity, requiring a reduced tripping force, and a short tripping time when a large short-circuit current appears. .
  • the mechanism according to the invention is characterized in that the opening pawl includes disengageable actuation means causing the lock to self-unlock in the presence of a short-circuit current exceeding a calibration threshold defined by elastic means, said self-unlocking being controlled from a mechanical reaction generated by the electrodynamic compensation effect, and causing an ultra-rapid rotation of the lock to unlock the opening pawl before the intervention of the triggering member.
  • the opening pawl comprises a retaining lever provided with a spout intended to hang on the latch in the locked position and at least one support flange of a roller cooperating with a surface d support of the trigger hook, said elastic means being arranged between the retaining lever and the flange, allowing a relative movement suitable for self-unlocking of the lock after exceeding the calibration threshold.
  • the retaining lever is articulated on the pivot axis of the opening pawl, the flange comprising an operating ramp intended to rotate the lock to ensure said self-unlocking.
  • a mechanism 10 for controlling a multipole circuit breaker is carried by a chassis 12, and includes a toggle device 14 having a pair of transmission rods 16, 18 articulated on a pivot axis 20.
  • the lower link 16 is mechanically coupled to a switching bar 22. made of insulating material extending perpendicular to the flanges of the chassis 12.
  • the switching bar 22 is common to all of the poles, and is constituted by a shaft mounted for rotation between an open position and a closed position of the circuit breaker contacts.
  • the circuit breaker is of the high current type, and having a high electrodynamic resistance.
  • each pole there is a connecting rod 24 which connects a crank 25 of the bar 22 to an insulating cage 26 for supporting the movable contact 28.
  • the movable contact 28 cooperates with a fixed contact 30 in the closed position, and is connected by a braid 32 to a first connection pad 34.
  • the fixed contact 30 is carried directly by the second connection pad 36.
  • a contact pressure spring 38 is arranged between the cage 26 and the upper face of each movable contact 28 .
  • the cage 26 is pivotally mounted around a first axis 40 between the closing position and the opening position, and the movable contact 28 comprises a plurality of parallel fingers articulated on a second axis 42 of the cage 26.
  • the toggle joint device 14 is associated with a trigger hook 44 mounted with limited tilting on a main axis 46 between an armed position and a triggered position.
  • the main axis 46 is integral with the chassis 12, and one of the ends of the hook 44 is articulated to the upper link 18 by an axis 48, while the other opposite end cooperates with an opening pawl 50.
  • An opening spring 52 is anchored between a lug 54 of the bar 22, and a fixed cleat 56 of the chassis 12, said cleat 56 being disposed above the toggle joint device 14.
  • the opening pawl 50 is formed by a lever lock 57 pivotally mounted on an axis 58, between a locked position and an unlocked position.
  • a half-moon shaped latch 60 is able to move the opening pawl 50 to the unlocked position to trigger the mechanism 10.
  • a spring 62 for returning the opening pawl 50 is located opposite the latching latch 60 relative to the axis 58, and biases the opening pawl 50 counterclockwise towards the locked position.
  • a roller 64 is formed on the locking lever 57 between the axis 58 and the latching latch 60, and cooperates in the armed position with a bearing surface 66 of the trigger hook 44.
  • the bearing surface 66 of the hook 44 has a recess in which the cylindrical roller 64 engages.
  • a return spring 68 is anchored between the axis 48 and the cleat 56 to urge the hook 44 counterclockwise towards the armed position, in which the roller 64 of the opening pawl 50 is engaged in the recess of the support surface 66.
  • L trigger 70 may be manually actuated, in particular by means of a button push-button, or automatic, in particular by a magnetothermic or electronic trigger, or by a trigger with emission sensitive to a remote control signal.
  • the opening pawl 50 is arranged in a disengageable assembly allowing the self-unlocking of the latch 60 in the presence of a short-circuit current exceeding a predetermined threshold subsequently called by the declutching threshold.
  • the contacts 28, 30 and pads 34, 36 form a U-shaped circuit, the second articulation axis 42 of the fingers of the movable contact 28 being located at one third of the distance separating the two pads 34, 36.
  • the structure of a such a circuit constitutes a system for compensating for the electrodynamic repulsion forces capable of keeping the contacts closed in the presence of a short-circuit current, and until the triggering of the mechanism 10 controlled by the triggering member 70.
  • the opening pawl 50 comprises a pair of flanges 72 for supporting the axis 58 and the roller 64 mounted for free rotation.
  • the declutching threshold is calibrated by means of two compression springs 74, 76, arranged between a guide plate 78 integral with the flanges 72, and a retaining lever 80 articulated on the axis 58.
  • the end of the retaining lever 80 is provided with a spout 82 intended to hook onto the latch 60 in the locked position of the pawl 50.
  • An end of travel stop 84 is secured to the flanges 72, and is capable of limiting the pivoting movement of the pawl 50 in the unlocked position.
  • Each flange 72 comprises an operating ramp 86 disposed in the vicinity of the spout 82 of the retaining lever 80, the inclination of the ramp 86 being chosen to cause self-unlocking of the lock 60, when the calibration threshold of the springs 74, 76 is exceeded.
  • the operation of the mechanism 10 equipped with the disengageable opening pawl 50 according to the invention is as follows:
  • the bearing surface 66 of the trigger hook 44 exerts a force F on the roller 64, and urges the opening pawl 50 to rotate clockwise around the axis 58 until hooking the spout 82 to latch 60.
  • the circuit breaker is then in a stable position for closing the contacts 30, 28.
  • the circuit breaker has a high electrodynamic resistance thanks to the electrodynamic compensation effect which tends to keep the contacts closed in the presence of an overload current.
  • This electrodynamic compensation effect results from the U-shaped structure of the electrical power circuit, the second axis 42 of articulation of the fingers of the movable contact 28 being advantageously located at one third of the distance separating the two connection pads 34, 36 from the electrical circuit. in U. This results in a torque which requests the maintenance of the contacts 28, 30 in the closed position despite the opposing necking forces.
  • the reinforcement of the contact pressure by electrodynamic effect results in a mechanical reaction, exerted on the axis 42 of the cage 26, and transmitted to the mechanism 10 and finally on the roller 64 via the hook of trigger 44.
  • This increase in the force F on the roller 64 is a function of the intensity of the current passing through the electric power circuit, and tends to rotate the opening pawl 50 clockwise when the force F is greater than the ratchet calibration threshold 50, which is defined by the springs 74, 76.
  • the spout 82 of the retaining lever 80 remains in engagement with the latch 60, but the flanges 72 of the pawl 50 begin to rotate around the axis 58 clockwise.
  • the ramps 86 of the flanges 72 of the pawl 50 cooperate with the half-moon of the latch 60, and causes its rotation in the clockwise direction F1 , so as to release the retaining spout 80, causing the opening pawl to move towards the unlocked position (FIG. 4).
  • the exhaust of the roller 64 also releases the trigger hook 44, which causes the contacts 30, 28 to open by the opening spring 52 associated with the toggle joint device 14.
  • the triggering of the mechanism 10 by the disengaging effect of the opening pawl 50 is ultra fast, and takes place before the intervention of the triggering member 70, which has a response time which is a function of the type of trigger. magnetothermic or electronic used in the circuit breaker.
  • the presence of the opening pawl 50 with self-disengagement of the latch 60 makes it possible to mechanically self-protect the circuit breaker in an ultra-fast manner, while remaining compatible with instantaneous protection of the trip device.
  • the ultra-rapid self-unlocking of the mechanism 10 is carried out for a high current level, in particular greater than 180 kA peak.
  • the opening pawl 50 according to the invention constitutes a modular sub-assembly, which is interchangeable with a conventional opening pawl, for example described in document EP-A-222,645.
  • the relative movement between the flanges 72 and the retaining lever 80 of the opening pawl 50 is effected by a rotational movement having a small angular clearance. It is clear that this relative displacement can be obtained by a translational movement thanks to an oblong light.

Abstract

The mechanism for a multi-polar circuit breaker comprises a pivoting lever system (14) associated with a release hook (44) and a switching bar (22). An opening pawl (50) co-operates with the hook to ensure the arming and release of the mechanism (10) in the locked and released positions of the pawl respectively. The opening pawl (50) comprises a releasable operating device, provoking the automatic unlocking of the bolt (60) in the presence of a short-circuit current exceeding a calibrated threshold. The threshold is defines by a spring mechanism (74,76). The automatic unlocking is controlled by the mechanical reaction generated by the electrodynamic compensation effect. This provokes an ultra-rapid rotation of the bolt to release the opening pawl (50) before the intervention of the release device (70).

Description

L'invention est relative à un mécanisme de commande d'un disjoncteur multipolaire basse tension à tenue électrodynamique élevée, et comprenant un circuit électrique de puissance ayant par pôle, une paire de contacts compensés, maintenus en position de fermeture par effet de compensation électrodynamique des forces de répulsion, ledit mécanisme étant porté par un châssis et comportant :

  • un dispositif à genouillère associé à un crochet de déclenchement et à un ressort d'ouverture pour déplacer le contact mobile vers une position d'ouverture lorsque le crochet est actionné à partir d'une position armée, vers une position déclenchée,
  • un barreau de commutation en matériau isolant accouplé au dispositif à genouillère en s'étendant transversalement au châssis, et comprenant un arbre rotatif de support des contacts mobiles de tous les pôles,
  • un cliquet d'ouverture coopérant avec le crochet de déclenchement pour assurer l'armement ou le déclenchement du mécanisme, respectivement en position verrouillée ou en position déverrouillée dudit cliquet,
  • et un verrou d'accrochage piloté par un organe de déclenchement pour actionner le cliquet d'ouverture vers la position déverrouillée.
The invention relates to a control mechanism of a low-voltage multipole circuit breaker with high electrodynamic resistance, and comprising an electric power circuit having, by pole, a pair of compensated contacts, maintained in the closed position by electrodynamic compensation effect of the repulsive forces, said mechanism being carried by a chassis and comprising:
  • a toggle joint device associated with a trigger hook and an opening spring for moving the movable contact to an open position when the hook is actuated from an armed position, towards a triggered position,
  • a switching rod made of insulating material coupled to the toggle joint device extending transversely to the chassis, and comprising a rotary shaft for supporting the movable contacts of all the poles,
  • an opening pawl cooperating with the trigger hook to arm or trigger the mechanism, respectively in the locked position or in the unlocked position of said pawl,
  • and a latching lock piloted by a triggering member for actuating the opening pawl towards the unlocked position.

Un mécanisme du genre mentionné est décrit dans le document EP-A-222.645 de la demanderesse. La tenue électrodynamique du disjoncteur résulte de l'action des ressorts de pression de contact sur les doigts multiples, et des contacts compensés, dont l'axe d'articulation est soumis à des réactions mécaniques importantes. Le mécanisme est apte à encaisser ces réactions pour un seuil maximum de courant de court-circuit. Au delà de ce seuil, les réactions sont susceptibles d'endommager certains axes ou organes de transmission du mécanisme, et risquent d'augmenter l'effort de déclenchement au niveau de l'étage comprenant le crochet, le cliquet d'ouverture, et le verrou. L'intervention du déclencheur instantané nécessite un temps de réponse de l'ordre de 10 ms pour obtenir le déclenchement du mécanisme, ce qui est trop long, si les performances du disjoncteur doivent satisfaire à une haute tenue électrodynamique, et à un pouvoir de coupure supérieure à 130kA.A mechanism of the kind mentioned is described in document EP-A-222,645 of the applicant. The electrodynamic resistance of the circuit breaker results from the action of the contact pressure springs on the multiple fingers, and of the compensated contacts, the hinge axis of which is subjected to significant mechanical reactions. The mechanism is capable of absorbing these reactions for a maximum threshold of short-circuit current. Beyond this threshold, the reactions are liable to damage certain axes or transmission members of the mechanism, and risk increasing the tripping force at the level of the stage comprising the hook, the opening pawl, and the lock. Intervention of the trigger instantaneous requires a response time of the order of 10 ms to obtain tripping of the mechanism, which is too long if the circuit breaker performance must satisfy high electrodynamic resistance, and a breaking capacity greater than 130kA.

Il a déjà été proposé (voir document FR-A-2.239.755) d'utiliser la réaction mécanique issue de la compensation électrodynamique des contacts compensés pour provoquer un déclenchement automatique, lequel intervient par l'échappement d'une pièce de verrouillage par rapport à la demi-lune qui reste fixe. La phase de réinitialisation après déclenchement sur court-circuit d'un tel mécanisme est difficile à mettre en oeuvre.It has already been proposed (see document FR-A-2,239,755) to use the mechanical reaction resulting from the electrodynamic compensation of the compensated contacts to cause an automatic tripping, which occurs by the escape of a locking piece with respect to to the half-moon which remains fixed. The reset phase after tripping on a short circuit of such a mechanism is difficult to implement.

L'objet de l'invention consiste à réaliser un disjoncteur à haute tenue électrodynamique, et à pouvoir de coupure élevée, nécessitant une force déclenchement réduite, et un temps de déclenchement court lors de l'apparition d'un courant de court-circuit important.The object of the invention consists in making a circuit breaker with high electrodynamic resistance, and with high breaking capacity, requiring a reduced tripping force, and a short tripping time when a large short-circuit current appears. .

Le mécanisme selon l'invention est caractérisé en ce que le cliquet d'ouverture comporte des moyens d'actionnement débrayable provoquant l'autodéverrouillage du verrou en présence d'un courant de court-circuit dépassant un seuil de calibrage défini par des moyens élastiques, ledit autodéverrouillage étant commandé à partir d'une réaction mécanique engendrée par l'effet de compensation électrodynamique, et provoquant une rotation ultra-rapide du verrou pour déverrouiller le cliquet d'ouverture avant l'intervention de l'organe de déclenchement.The mechanism according to the invention is characterized in that the opening pawl includes disengageable actuation means causing the lock to self-unlock in the presence of a short-circuit current exceeding a calibration threshold defined by elastic means, said self-unlocking being controlled from a mechanical reaction generated by the electrodynamic compensation effect, and causing an ultra-rapid rotation of the lock to unlock the opening pawl before the intervention of the triggering member.

Selon une caractéristique de l'invention, le cliquet d'ouverture comporte un levier de retenue doté d'un bec destiné à s'accrocher au verrou dans la position verrouillée et au moins un flasque de support d'un galet coopérant avec une surface d'appui du crochet de déclenchement, lesdits moyens élastiques étant agencés entre le levier de retenue et le flasque en autorisant un mouvement relatif adapté à l'autodéverrouillage du verrou après dépassement du seuil de calibrage.According to a characteristic of the invention, the opening pawl comprises a retaining lever provided with a spout intended to hang on the latch in the locked position and at least one support flange of a roller cooperating with a surface d support of the trigger hook, said elastic means being arranged between the retaining lever and the flange, allowing a relative movement suitable for self-unlocking of the lock after exceeding the calibration threshold.

Selon un mode de réalisation préférentiel, le levier de retenue est articulé sur l'axe de pivotement du cliquet d'ouverture, le flasque comprenant une rampe de manoeuvre destinée à faire tourner le verrou pour assurer ledit autodéverrouillage.According to a preferred embodiment, the retaining lever is articulated on the pivot axis of the opening pawl, the flange comprising an operating ramp intended to rotate the lock to ensure said self-unlocking.

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

  • la figure 1 est une vue schématique du mécanisme équipé du cliquet d'ouverture selon l'invention, les contacts étant représentés en position de fermeture,
  • la figure 2 est une vue identique à la figure 1 représentant le mécanisme en position d'ouverture des contacts,
  • la figure 3 montre une vue du cliquet d'ouverture de la figure 1 en position verrouillée,
  • la figure 4 est une vue identique du cliquet de la figure 3 lors de la phase d'autodéverrouillage du verrou.
Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment given by way of nonlimiting example, and represented in the appended drawings, in which,
  • FIG. 1 is a schematic view of the mechanism fitted with the opening pawl according to the invention, the contacts being shown in the closed position,
  • FIG. 2 is a view identical to FIG. 1 showing the mechanism in the open position of the contacts,
  • FIG. 3 shows a view of the opening pawl of FIG. 1 in the locked position,
  • Figure 4 is an identical view of the pawl of Figure 3 during the self-unlocking phase of the lock.

En référence aux figures 1 et 2, un mécanisme 10 de commande d'un disjoncteur multipolaire est porté par un châssis 12, et comporte un dispositif à genouillère 14 ayant une paire de biellettes de transmission 16, 18 articulées sur un axe de pivotement 20. La biellette inférieure 16 est accouplée mécaniquement à un barreau de commutation 22. en matériau isolant s'étendant perpendiculairement aux flasques du châssis 12. Le barreau de commutation 22 est commun à l'ensemble des pôles, et est constitué par un arbre monté à rotation entre une position d'ouverture et une position de fermeture des contacts du disjoncteur. Le disjoncteur est du type à fortes intensités, et ayant une tenue électrodynamique élevée.With reference to FIGS. 1 and 2, a mechanism 10 for controlling a multipole circuit breaker is carried by a chassis 12, and includes a toggle device 14 having a pair of transmission rods 16, 18 articulated on a pivot axis 20. The lower link 16 is mechanically coupled to a switching bar 22. made of insulating material extending perpendicular to the flanges of the chassis 12. The switching bar 22 is common to all of the poles, and is constituted by a shaft mounted for rotation between an open position and a closed position of the circuit breaker contacts. The circuit breaker is of the high current type, and having a high electrodynamic resistance.

Au niveau de chaque pôle, est agencée une tringle de liaison 24 qui relie une manivelle 25 du barreau 22 à une cage 26 isolante de support du contact mobile 28. Le contact mobile 28 coopère avec un contact fixe 30 en positon de fermeture, et est relié par une tresse 32 à une première plage de raccordement 34. Le contact fixe 30 est porté directement par la deuxième plage de raccordement 36. Un ressort 38 de pression de contact est agencé entre la cage 26 et la face supérieure de chaque contact mobile 28.At each pole, there is a connecting rod 24 which connects a crank 25 of the bar 22 to an insulating cage 26 for supporting the movable contact 28. The movable contact 28 cooperates with a fixed contact 30 in the closed position, and is connected by a braid 32 to a first connection pad 34. The fixed contact 30 is carried directly by the second connection pad 36. A contact pressure spring 38 is arranged between the cage 26 and the upper face of each movable contact 28 .

La cage 26 est montée à pivotement autour d'un premier axe 40 entre la positon de fermeture, et la positon d'ouverture, et le contact mobile 28 comporte une pluralité de doigts parallèles articulés sur un deuxième axe 42 de la cage 26.The cage 26 is pivotally mounted around a first axis 40 between the closing position and the opening position, and the movable contact 28 comprises a plurality of parallel fingers articulated on a second axis 42 of the cage 26.

Au dispositif à genouillère 14 est associé un crochet de déclenchement 44 monté à basculement limité sur un axe principal 46 entre une position armée, et une position déclenchée. L'axe principal 46 est solidaire du châssis 12, et l'une des extrémités du crochet 44 est articulée à la biellette supérieure 18 par un axe 48, tandis que l'autre extrémité opposée coopère avec un cliquet d'ouverture 50.The toggle joint device 14 is associated with a trigger hook 44 mounted with limited tilting on a main axis 46 between an armed position and a triggered position. The main axis 46 is integral with the chassis 12, and one of the ends of the hook 44 is articulated to the upper link 18 by an axis 48, while the other opposite end cooperates with an opening pawl 50.

Un ressort d'ouverture 52 est ancré entre un ergot 54 du barreau 22, et un taquet 56 fixe du châssis 12, ledit taquet 56 étant disposé au-dessus du dispositif à genouillère 14. Le cliquet d'ouverture 50 est formé par un levier de verrouillage 57 monté à pivotement sur un axe 58, entre une position verrouillée et une position déverrouillée. Un verrou d'accrochage 60 en forme de demi-lune est apte à déplacer le cliquet d'ouverture 50 vers la position déverrouillée pour provoquer le déclenchement du mécanisme 10.An opening spring 52 is anchored between a lug 54 of the bar 22, and a fixed cleat 56 of the chassis 12, said cleat 56 being disposed above the toggle joint device 14. The opening pawl 50 is formed by a lever lock 57 pivotally mounted on an axis 58, between a locked position and an unlocked position. A half-moon shaped latch 60 is able to move the opening pawl 50 to the unlocked position to trigger the mechanism 10.

Un ressort 62 de rappel du cliquet d'ouverture 50 se trouve à l'opposé du verrou d'accrochage 60 par rapport à l'axe 58, et sollicite le cliquet d'ouverture 50 dans le sens anti-horaire vers la position verrouillée. Un galet 64 est ménagé sur le levier de verrouillage 57 entre l'axe 58 et le verrou d'accrochage 60, et coopère en position armée avec une surface d'appui 66 du crochet de déclenchement 44. La surface d'appui 66 du crochet 44 présente un évidement dans lequel s'engage le galet 64 cylindrique. Un ressort 68 de rappel est ancré entre l'axe 48 et le taquet 56 pour solliciter le crochet 44 dans le sens anti-horaire vers la position armée, dans laquelle le galet 64 du cliquet d'ouverture 50 est engagé dans l'évidement de la surface d'appui 66.A spring 62 for returning the opening pawl 50 is located opposite the latching latch 60 relative to the axis 58, and biases the opening pawl 50 counterclockwise towards the locked position. A roller 64 is formed on the locking lever 57 between the axis 58 and the latching latch 60, and cooperates in the armed position with a bearing surface 66 of the trigger hook 44. The bearing surface 66 of the hook 44 has a recess in which the cylindrical roller 64 engages. A return spring 68 is anchored between the axis 48 and the cleat 56 to urge the hook 44 counterclockwise towards the armed position, in which the roller 64 of the opening pawl 50 is engaged in the recess of the support surface 66.

Le verrou d'accrochage 60 du cliquet d'ouverture 50 est commandé par un organe de déclenchement 70 pour entraîner le levier de verrouillage 57 vers la position déverrouillée, entraînant le déclenchement du mécanisme 10, et l'ouverture des contacts 28, 30. L'organe de déclenchement 70 peut être à actionnement manuel, notamment au moyen d'un bouton poussoir, ou automatique, notamment par un déclencheur magnétothermique ou électronique, ou par un déclencheur à émission sensible à un signal de télécommande.The latching latch 60 of the opening pawl 50 is controlled by a triggering member 70 to drive the locking lever 57 to the unlocked position, causing the mechanism 10 to trip, and the contacts 28, 30 to open. L trigger 70 may be manually actuated, in particular by means of a button push-button, or automatic, in particular by a magnetothermic or electronic trigger, or by a trigger with emission sensitive to a remote control signal.

Selon l'invention, le cliquet d'ouverture 50 est agencé selon un ensemble débrayable permettant l'autodéverrouillage du verrou 60 en présence d'un courant de court-circuit dépassant un seuil prédéterminé appelé par la suite par le seuil de débrayage.According to the invention, the opening pawl 50 is arranged in a disengageable assembly allowing the self-unlocking of the latch 60 in the presence of a short-circuit current exceeding a predetermined threshold subsequently called by the declutching threshold.

Les contacts 28, 30 et des plages 34, 36 forment un circuit en U, le deuxième axe d'articulation 42 des doigts du contact mobile 28 étant situé au tiers de la distance séparant les deux plages 34, 36. La structure d'un tel circuit constitue un système de compensation des forces de répulsion électrodynamique apte à maintenir les contacts fermés en présence d'un courant de court-circuit, et jusqu'au déclenchement du mécanisme 10 piloté par l'organe de déclenchement 70.The contacts 28, 30 and pads 34, 36 form a U-shaped circuit, the second articulation axis 42 of the fingers of the movable contact 28 being located at one third of the distance separating the two pads 34, 36. The structure of a such a circuit constitutes a system for compensating for the electrodynamic repulsion forces capable of keeping the contacts closed in the presence of a short-circuit current, and until the triggering of the mechanism 10 controlled by the triggering member 70.

En référence aux figures 3 et 4, le cliquet d'ouverture 50 comporte une paire de flasques 72 de support de l'axe 58 et du galet 64 monté à rotation libre. Le seuil de débrayage est calibré au moyen de deux ressorts 74, 76 de compression, agencés entre une plaquette 78 de guidage solidaire des flasques 72, et un levier de retenue 80 articulé sur l'axe 58. L'extrémité du levier de retenue 80 est pourvue d'un bec 82 destiné à s'accrocher au verrou 60 dans la position verrouillée du cliquet 50.Referring to Figures 3 and 4, the opening pawl 50 comprises a pair of flanges 72 for supporting the axis 58 and the roller 64 mounted for free rotation. The declutching threshold is calibrated by means of two compression springs 74, 76, arranged between a guide plate 78 integral with the flanges 72, and a retaining lever 80 articulated on the axis 58. The end of the retaining lever 80 is provided with a spout 82 intended to hook onto the latch 60 in the locked position of the pawl 50.

Une butée 84 de fin de course est solidaire des flasques 72, et est apte à limiter le mouvement de pivotement du cliquet 50 dans la position déverrouillée. Chaque flasque 72 comporte une rampe de manoeuvre 86 disposée au voisinage du bec 82 du levier de retenue 80, l'inclinaison de la rampe 86 étant choisie pour provoquer l'autodéverrouillage du verrou 60, lorsque le seuil de calibrage des ressorts 74, 76 est dépassé. Le fonctionnement du mécanisme 10 équipé du cliquet d'ouverture 50 débrayable selon l'invention est le suivant :An end of travel stop 84 is secured to the flanges 72, and is capable of limiting the pivoting movement of the pawl 50 in the unlocked position. Each flange 72 comprises an operating ramp 86 disposed in the vicinity of the spout 82 of the retaining lever 80, the inclination of the ramp 86 being chosen to cause self-unlocking of the lock 60, when the calibration threshold of the springs 74, 76 is exceeded. The operation of the mechanism 10 equipped with the disengageable opening pawl 50 according to the invention is as follows:

Lors de la phase de fermeture du mécanisme 10, la surface d'appui 66 du crochet de déclenchement 44 exerce un effort F sur le galet 64, et sollicite le cliquet d'ouverture 50 en rotation dans le sens horaire autour de l'axe 58 jusqu'à l'accrochage du bec 82 au verrou 60. Le disjoncteur se trouve alors dans une position stable de fermeture des contacts 30, 28.During the closing phase of the mechanism 10, the bearing surface 66 of the trigger hook 44 exerts a force F on the roller 64, and urges the opening pawl 50 to rotate clockwise around the axis 58 until hooking the spout 82 to latch 60. The circuit breaker is then in a stable position for closing the contacts 30, 28.

Le disjoncteur présente une tenue électrodynamique élevée grâce à l'effet de compensation électrodynamique qui a tendance à maintenir les contacts fermés en présence d'un courant de surcharge. Cet effet de compensation électrodynamique résulte de la structure en U du circuit électrique de puissance, le deuxième axe 42 d'articulation des doigts du contact mobile 28 étant avantageusement situé au tiers de la distance séparant les deux plages de raccordement 34, 36 du circuit électrique en U. Il en résulte un couple qui sollicite le maintien des contacts 28, 30 en position de fermeture malgré les forces de striction antagonistes.The circuit breaker has a high electrodynamic resistance thanks to the electrodynamic compensation effect which tends to keep the contacts closed in the presence of an overload current. This electrodynamic compensation effect results from the U-shaped structure of the electrical power circuit, the second axis 42 of articulation of the fingers of the movable contact 28 being advantageously located at one third of the distance separating the two connection pads 34, 36 from the electrical circuit. in U. This results in a torque which requests the maintenance of the contacts 28, 30 in the closed position despite the opposing necking forces.

Le renforcement de la pression de contact par effet électrodynamique se traduit par une réaction mécanique, s'exerçant sur l'axe 42 de la cage 26, et se transmettant vers le mécanisme 10 et finalement sur le galet 64 par l'intermédiaire du crochet de déclenchement 44.The reinforcement of the contact pressure by electrodynamic effect results in a mechanical reaction, exerted on the axis 42 of the cage 26, and transmitted to the mechanism 10 and finally on the roller 64 via the hook of trigger 44.

Cette augmentation de l'effort F sur le galet 64 est fonction de l'intensité du courant traversant le circuit électrique de puissance, et a tendance à faire tourner le cliquet d'ouverture 50 dans le sens horaire lorsque l'effort F est supérieur au seuil de calibrage du cliquet 50, lequel est défini par les ressorts 74, 76.This increase in the force F on the roller 64 is a function of the intensity of the current passing through the electric power circuit, and tends to rotate the opening pawl 50 clockwise when the force F is greater than the ratchet calibration threshold 50, which is defined by the springs 74, 76.

Au début du déplacement en rotation du cliquet d'ouverture, le bec 82 du levier de retenue 80 reste en engagement avec le verrou 60, mais les flasques 72 du cliquet 50 commencent à tourner autour de l'axe 58 dans le sens horaire. A partir d'un effort calibré correspondant au seuil d'auto-déverrouillage du verrou d'accrochage 60, les rampes 86 des flasques 72 du cliquet 50 coopèrent avec la demi-lune du verrou 60, et provoque sa rotation dans le sens F1 horaire, de manière à libérer le bec de retenue 80, entraînant le déplacement du cliquet d'ouverture vers la position déverrouillée (figure 4). L'échappement du galet 64 libère également le crochet de déclenchement 44, lequel provoque l'ouverture des contacts 30, 28 par le ressort d'ouverture 52 associé au dispositif à genouillère 14.At the start of the rotational movement of the opening pawl, the spout 82 of the retaining lever 80 remains in engagement with the latch 60, but the flanges 72 of the pawl 50 begin to rotate around the axis 58 clockwise. From a calibrated force corresponding to the self-unlocking threshold of the latching bolt 60, the ramps 86 of the flanges 72 of the pawl 50 cooperate with the half-moon of the latch 60, and causes its rotation in the clockwise direction F1 , so as to release the retaining spout 80, causing the opening pawl to move towards the unlocked position (FIG. 4). The exhaust of the roller 64 also releases the trigger hook 44, which causes the contacts 30, 28 to open by the opening spring 52 associated with the toggle joint device 14.

Le déclenchement du mécanisme 10 par l'effet de débrayage du cliquet d'ouverture 50 est ultra rapide, et s'opère avant l'intervention de l'organe de déclenchement 70, lequel possède un temps de réponse qui est fonction du type de déclencheur magnétothermique ou électronique utilisé dans le disjoncteur. La présence du cliquet d'ouverture 50 à autodébrayage du verrou 60 permet d'autoprotéger mécaniquement le disjoncteur de manière ultra-rapide, tout en restant compatible avec la protection instantanée du déclencheur.The triggering of the mechanism 10 by the disengaging effect of the opening pawl 50 is ultra fast, and takes place before the intervention of the triggering member 70, which has a response time which is a function of the type of trigger. magnetothermic or electronic used in the circuit breaker. The presence of the opening pawl 50 with self-disengagement of the latch 60 makes it possible to mechanically self-protect the circuit breaker in an ultra-fast manner, while remaining compatible with instantaneous protection of the trip device.

L'autodéverrouillage ultra-rapide du mécanisme 10 s'effectue pour un niveau de courant élevé, notamment supérieur à 180 kA crête. Le cliquet d'ouverture 50 selon l'invention, constitue un sous-ensemble modulaire, lequel est interchangeable avec un cliquet d'ouverture classique, par exemple décrit dans le document EP-A-222.645.The ultra-rapid self-unlocking of the mechanism 10 is carried out for a high current level, in particular greater than 180 kA peak. The opening pawl 50 according to the invention constitutes a modular sub-assembly, which is interchangeable with a conventional opening pawl, for example described in document EP-A-222,645.

Selon la réalisation des figures 1 à 4, le déplacement relatif entre les flasques 72 et le levier de retenue 80 du cliquet d'ouverture 50 s'effectue par un mouvement de rotation ayant un faible débattement angulaire. Il est clair que ce déplacement relatif peut être obtenu par un mouvement de translation grâce à une lumière oblongue.According to the embodiment of Figures 1 to 4, the relative movement between the flanges 72 and the retaining lever 80 of the opening pawl 50 is effected by a rotational movement having a small angular clearance. It is clear that this relative displacement can be obtained by a translational movement thanks to an oblong light.

Claims (7)

Mécanisme de commande d'un disjoncteur multipolaire basse tension à tenue électrodynamique élevée, et comprenant un circuit électrique de puissance ayant par pôle, une paire de contacts (28, 30) compensés, maintenus en position de fermeture par effet de compensation électrodynamique des forces de répulsion, ledit mécanisme (10) étant porté par un châssis (12), et comportant : - un dispositif à genouillère (14) associé à un crochet de déclenchement (44) et à un ressort d'ouverture (52) pour déplacer le contact mobile 28 vers une position d'ouverture lorsque le crochet 44 est actionné à partir d'une position armée, vers une position déclenchée, - un barreau de commutation (22) en matériau isolant accouplé au dispositif à genouillère (14) en s'étendant transversalement au châssis (12), et comprenant un arbre rotatif de support des contacts mobiles (28) de tous les pôles, - un cliquet d'ouverture (50) coopérant avec le crochet de déclenchement (44) pour assurer l'armement ou le déclenchement du mécanisme (10), respectivement en position verrouillée ou en position déverrouillée dudit cliquet, - et un verrou d'accrochage (60) piloté par un organe de déclenchement (70) pour actionner le cliquet d'ouverture (50) vers la position déverrouillée, caractérisé en ce que
le cliquet d'ouverture (50) comporte des moyens d'actionnement débrayables provoquant l'autodéverrouillage du verrou (60) en présence d'un courant de court-circuit dépassant un seuil de calibrage défini par des moyens élastiques (74, 76), ledit autodéverrouillage étant commandé à partir d'une réaction mécanique engendrée par l'effet de compensation électrodynamique, et provoquant une rotation ultra-rapide du verrou (60) pour déverrouiller le cliquet d'ouverture (50) avant l'intervention de l'organe de déclenchement (70).Control mechanism of a low-voltage multipolar circuit breaker with high electrodynamic resistance, and comprising an electric power circuit having, by pole, a pair of compensated contacts (28, 30), maintained in the closed position by effect of electrodynamic compensation of the forces repulsion, said mechanism (10) being carried by a chassis (12), and comprising: - a toggle device (14) associated with a trigger hook (44) and an opening spring (52) for moving the movable contact 28 to an open position when the hook 44 is actuated from a armed position, towards a triggered position, a switching rod (22) made of insulating material coupled to the toggle joint device (14) extending transversely to the frame (12), and comprising a rotary shaft for supporting the movable contacts (28) of all the poles, an opening pawl (50) cooperating with the trigger hook (44) to arm or trigger the mechanism (10), respectively in the locked position or in the unlocked position of said pawl, - and a latching lock (60) controlled by a triggering member (70) for actuating the opening pawl (50) towards the unlocked position, characterized in that
the opening pawl (50) comprises disengageable actuating means causing the bolt to self-unlock (60) in the presence of a short-circuit current exceeding a calibration threshold defined by elastic means (74, 76), said self-unlocking being controlled from a mechanical reaction generated by the electrodynamic compensation effect, and causing an ultra-rapid rotation of the latch (60) to unlock the opening pawl (50) before the intervention of the member trigger (70). Mécanisme de commande selon la revendication 1, caractérisé en ce que le cliquet d'ouverture (50) comporte un levier de retenue (80) doté d'un bec (82) destiné à s'accrocher au verrou (60) dans la position verrouillée, et au moins un flasque (72) de support d'un galet (64) coopérant avec une surface d'appui (66) du crochet de déclenchement (44), lesdits moyens élastiques (74, 76) étant agencés entre le levier de retenue (80) et le flasque (72) en autorisant un mouvement relatif adapté à l'autodéverrouillage du verrou (60) après dépassement du seuil de calibrage.Control mechanism according to claim 1, characterized in that the opening pawl (50) comprises a retaining lever (80) provided with a spout (82) intended to hang on the latch (60) in the locked position , and at least one flange (72) for supporting a roller (64) cooperating with a bearing surface (66) of the hook release (44), said elastic means (74, 76) being arranged between the retaining lever (80) and the flange (72) allowing a relative movement suitable for self-unlocking of the lock (60) after exceeding the calibration threshold . Mécanisme de commande selon la revendication 2, caractérisé en ce que le levier de retenue (80) est articulé sur l'axe (58) de pivotement du cliquet d'ouverture (50), le flasque (70) comprenant une rampe (86) de manoeuvre destinée à faire tourner le verrou (60) pour assurer ledit autodéverrouillage.Control mechanism according to claim 2, characterized in that the retaining lever (80) is articulated on the axis (58) of pivoting of the opening pawl (50), the flange (70) comprising a ramp (86) maneuver intended to rotate the lock (60) to ensure said self-unlocking. Mécanisme de commande selon la revendication 3, caractérisé en ce que les moyens élastiques (74, 76) sont formés par des ressorts de compression insérés entre une plaquette (78) de guidage solidaire du flasque (72), et une paroi d'appui interne du levier de retenue (80).Control mechanism according to claim 3, characterized in that the elastic means (74, 76) are formed by compression springs inserted between a guide plate (78) integral with the flange (72), and an internal support wall of the retaining lever (80). Mécanisme de commande selon la revendication 4, caractérisé en ce que la paroi d'appui des ressorts de compression est agencée dans un zone intermédiaire entre l'axe (58) de pivotement du levier de retenue (80), et le bec (82) d'accrochage.Control mechanism according to claim 4, characterized in that the support wall of the compression springs is arranged in an intermediate zone between the pivot axis (58) of the retaining lever (80) and the spout (82) hanging. Mécanisme de commande selon la revendication 1, caractérisé en ce qu'un ressort de rappel (62) sollicite le cliquet d'ouverture (50) vers la position verrouillée, ledit ressort se trouvant à l'opposé du verrou d'accrochage (60) par rapport à l'axe (58) de pivotement du cliquet d'ouverture (50).Control mechanism according to claim 1, characterized in that a return spring (62) biases the opening pawl (50) towards the locked position, said spring being opposite the latching lock (60) relative to the pivot axis (58) of the opening pawl (50). Mécanisme de commande selon la revendication 2, caractérisé en ce que le levier de retenue est monté à translation limitée sur le flasque (72) pour définir ledit mouvement relatif d'autodéverrouillage.Control mechanism according to claim 2, characterized in that the retaining lever is mounted in limited translation on the flange (72) to define said relative self-unlocking movement.
EP97410012A 1996-02-06 1997-01-29 Operating mechanism for a circuit breaker with a latch disengageable by a short circuit Expired - Lifetime EP0789380B1 (en)

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FR9601661A FR2744563B1 (en) 1996-02-06 1996-02-06 CONTROL MECHANISM OF A CIRCUIT-BREAKER WITH RELEASABLE LOCK ON A SHORT-CIRCUIT
FR9601661 1996-02-06

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EP0789380A1 true EP0789380A1 (en) 1997-08-13
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EP2597427A1 (en) 2011-11-28 2013-05-29 Schneider Electric Industries SAS Method for evaluating the mechanical performances of a switchgear apparatus and switchgear apparatus for implementation of said method
EP2597428A1 (en) 2011-11-28 2013-05-29 Schneider Electric Industries SAS Method for evaluating the mechanical performances of a switchgear device and switchgear device for implementation of said method
FR2983294A1 (en) * 2011-11-28 2013-05-31 Schneider Electric Ind Sas METHOD FOR EVALUATING THE MECHANICAL PERFORMANCE OF A CUTTING DEVICE AND CUTTING DEVICE FOR CARRYING OUT SAID METHOD
RU2621902C2 (en) * 2011-11-28 2017-06-08 Шнейдер Электрик Эндюстри Сас Method for evaluation of mechanical properties of distribution unit and distribution unit to performfor method performing
DE102013217678A1 (en) 2012-09-10 2014-03-13 Schneider Electric Industries Sas METHOD FOR EVALUATING THE MECHANICAL BEHAVIOR OF A SWITCHGEAR DEVICE AND SWITCHGEAR DEVICE FOR IMPLEMENTING THE PROCESS
US9324513B2 (en) 2012-09-10 2016-04-26 Schneider Electric Industries Sas Method for evaluating the mechanical performances of a switchgear device and switchgear device for implementation of said method
DE102013217678B4 (en) 2012-09-10 2023-10-05 Schneider Electric Industries Sas METHOD FOR ASSESSING THE MECHANICAL BEHAVIORS OF A SWITCHGEAR DEVICE AND SWITCHGEAR DEVICE FOR IMPLEMENTING THE METHOD
FR3101191A1 (en) 2019-09-25 2021-03-26 Schneider Electric Industries Sas Determination of the state of a breaking device
EP3799095A1 (en) 2019-09-25 2021-03-31 Schneider Electric Industries SAS Determination of a state of a cut-off device
US11177090B2 (en) 2019-09-25 2021-11-16 Schneider Electric Industries Sas Determining a state of a switching unit

Also Published As

Publication number Publication date
FR2744563A1 (en) 1997-08-08
CN1162186A (en) 1997-10-15
FR2744563B1 (en) 1998-04-03
DE69711742D1 (en) 2002-05-16
ZA97857B (en) 1997-08-06
JPH09288960A (en) 1997-11-04
KR970063313A (en) 1997-09-12
ES2175312T3 (en) 2002-11-16
CA2196916C (en) 2005-11-01
KR100425355B1 (en) 2004-06-18
TR199700086A2 (en) 1998-07-21
TW364139B (en) 1999-07-11
JP4237832B2 (en) 2009-03-11
RU2154322C2 (en) 2000-08-10
DE69711742T2 (en) 2002-10-17
TR199700086A3 (en) 1998-07-21
BR9700886A (en) 1998-11-24
EP0789380B1 (en) 2002-04-10
UA42780C2 (en) 2001-11-15
US5731560A (en) 1998-03-24
CA2196916A1 (en) 1997-08-07
SG77129A1 (en) 2000-12-19
CN1082711C (en) 2002-04-10

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