EP0560697A1 - Moulded-case circuit breaker with retardation at the end of the contact bridges repulsion movement - Google Patents

Moulded-case circuit breaker with retardation at the end of the contact bridges repulsion movement Download PDF

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Publication number
EP0560697A1
EP0560697A1 EP19930420100 EP93420100A EP0560697A1 EP 0560697 A1 EP0560697 A1 EP 0560697A1 EP 19930420100 EP19930420100 EP 19930420100 EP 93420100 A EP93420100 A EP 93420100A EP 0560697 A1 EP0560697 A1 EP 0560697A1
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EP
European Patent Office
Prior art keywords
contact bridge
circuit breaker
springs
bar
contact
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
EP19930420100
Other languages
German (de)
French (fr)
Other versions
EP0560697B1 (en
Inventor
Denis Vial
Jean Bonfils
Marc Rival
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 SE
Original Assignee
Merlin Gerin SA
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
Priority to FR9203142 priority Critical
Priority to FR9203142A priority patent/FR2688626B1/en
Application filed by Merlin Gerin SA, Schneider Electric SE filed Critical Merlin Gerin SA
Publication of EP0560697A1 publication Critical patent/EP0560697A1/en
Application granted granted Critical
Publication of EP0560697B1 publication Critical patent/EP0560697B1/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/12Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20Bridging contacts
    • H01H1/2041Rotating bridge
    • H01H1/205Details concerning the elastic mounting of the rotating bridge in the rotor
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02Details
    • H01H73/04Contacts
    • H01H73/045Bridging contacts
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02Protective 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
    • H01H77/10Protective 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
    • H01H77/102Protective 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 characterised by special mounting of contact arm, allowing blow-off movement
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/12Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20Bridging contacts
    • H01H1/2041Rotating bridge
    • H01H1/2058Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/50Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00Mechanisms for operating contacts
    • H01H3/60Mechanical arrangements for preventing or damping vibration or shock
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/1081Modifications for selective or back-up protection; Correlation between feeder and branch circuit breaker
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02Protective 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
    • H01H77/10Protective 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
    • H01H77/102Protective 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 characterised by special mounting of contact arm, allowing blow-off movement
    • H01H77/104Protective 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 characterised by special mounting of contact arm, allowing blow-off movement with a stable blow-off position
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H01H9/446Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using magnetisable elements associated with the contacts

Abstract

Le pont de contacts (13) d'un disjoncteur à boîtier moulé est monté flottant dans un barreau (20) par deux ressorts (22,23) disposés symétriquement de l'axe fictif de rotation (37). The contact bridge (13) of a molded case circuit breaker is mounted in a floating rod (20) by two springs (22,23) disposed symmetrically to the notional axis of rotation (37). Chaque ressort est d'une part ancré au pont de contacts((13) , et d'autre part à une tige (42) logée dans une encoche (43) du barreau. Les mêmes ressorts assurent la pression de contact et le freinage de l'ouverture du pont de contacts (13) en fin de course de répulsion par effet électrodynamique. Le pont de contacts porte sur sa tranche des surfaces de cames (44) qui en fin de course d'ouverture , engagent les tiges d'ancrage (42) pour déplacer ces dernières dans les encoches (43) en direction d'élongation des ressorts de traction. L'énergie du pont de contacts est ainsi reprise et accumulée dans les ressorts en provoquant un freinage du pont de contacts. Le profil des cames (44) peut être choisi pour autoriser une refermeture du pont de contacts, cette refermeture étant bien entendu retardée par l'effet de freinage en fin de course. Le profil de la came peut également assuré un accrochage du pont de contacts en position ouverte. Each spring is anchored to a part in the contact bridge ((13), and secondly to a rod (42) housed in a notch (43) of the rod. The same springs provide the contact pressure and braking the opening of the contact bridge (13) at the end of repulsion travel by electrodynamic effect. the contact bridge holder on its edge cam surfaces (44) at the end of opening travel, engage the anchor rods (42) for moving the latter in the slots (43) in the direction of elongation of the tension springs. the energy of the contact bridge is thus taken and accumulated in the springs by causing a braking of the contact bridge. the profile of cams (44) can be selected to allow reclosure of the contact bridge, this reclosing course being delayed by the braking effect at the stroke end. the profile of the cam may also be provided a coupling of the contact bridge in the open position .

Description

  • L'invention est relative à un disjoncteur basse tension à boîtier moulé comprenant un pont de contacts rotatif, une paire de contacts fixes coopérant avec ledit pont de contacts, des conducteurs d'amenée de courant auxdits contacts fixes agencés pour engendrer des forces électrodynamiques de répulsion du pont de contacts en position répulsée d'ouverture lors d'un passage d'un courant de court-circuit, un barreau rotatif ayant un orifice transversal de logement avec j'eu dudit pont de contacts, lequel fait saillie de part et d'autre du barreau, au moins une paire de ressorts de traction intercalés entre le barreau et le pont de contacts pour assurer une pression de contact du pont de contacts sur les contacts fixes en position de fermeture du disjoncteur, tout en autorisant une rotation du pont de contacts sous l'action desdites forces électrodynamiques vers la position répulsée d'ouverture. The invention relates to a low-voltage molded case circuit breaker comprising a rotary contact bridge, a pair of stationary contacts cooperating with said contact bridge, conductors of the supply current to said stationary contacts arranged to generate electrodynamic forces repelling the bridge contact in the repelled open position when a transition from a short-circuit current, a rotary bar having a transverse orifice housing with j'eu said contact bridge, which protrudes from either of another of the bar, at least one pair of tension springs interposed between the bar and contact bridge to provide a contact pressure of the contact bridge on the stationary contacts in the circuit breaker closed position, while allowing a rotation of the bridge contact under the action of said electrodynamic forces to the repelled open position.
  • Dans un disjoncteur limiteur du genre mentionné, le pont de contacts s'ouvre rapidement sous l'action des forces électrodynamiques de répulsion lors de l'apparition d'un courant de court-circuit. In a limiting circuit breaker of the kind mentioned, the contact bridge opens quickly under the action of electrodynamic forces of repulsion upon the occurrence of a short circuit current. La coupure rapide assure une limitation du courant et dès la disparition du courant, le pont de contacts tend à revenir en position fermée. The fast break provides current limiting and on elimination of the current, the contact bridge tends to return to the closed position. Le rappel du pont de contacts en position de fermeture par les ressorts agissant sur ce pont de contacts, est accentué par le rebondissement du pont de contacts sur la butée de fin de course de répulsion. The reminder of the contact bridge in the closed position by the springs acting on the contact bridge, is accentuated by the bouncing of the contact bridge on the abutment end of repulsion travel. Ces effets conjugués peuvent provoquer la refermeture des contacts avant la confirmation de l'ouverture par le mécanisme de déclenchement,ou avant l'intervention du disjoncteur aval dans un dispositif sélectif. These combined effects can cause the reclosing of the contacts before the confirmation of the opening by the trigger mechanism, or before the operation of the downstream circuit breaker in a selective device. Un disjoncteurconnu comporte un accrochage maintenant le contact répulsé en position d'ouverture pour éviter toute refermeture intempestive des contacts. A disjoncteurconnu comprises a hooking maintaining repulsed contact in the open position to prevent inadvertent closing of contacts. Ce dispositif nécessite des pièces additionnelles d'accrochage et par la suite de libération du contact. This device requires additional attachment parts and then release the contact.
  • La présente invention a pour but de permettre la réalisation d'un dispositif simple de freinage et éventuellement d'accrochage du pont de contacts mobile ne nécessitant aucun pièce additionnelle. The present invention aims to allow the realization of a simple braking device and possibly catching the movable contact bridge does not require any additional parts.
  • Le disjoncteur selon l'invention est caractérisé en ce que lesdits ressorts, disposés symétriquement de part et d'autre de l'axe de rotation du pont de contacts, présentent chacun une extrémité ancrée au pont de contacts et une extrémité opposée ancrée à une tige montée dans une encoche du barreau et que ledit pont de contacts présente une paire de cames symétriques par rapport audit axe,chacune agencée pour coopérer en fin de course de répulsion du pont de contacts avec l'une des tiges pour freiner le mouvement du pont de contacts. The circuit breaker according to the invention is characterized in that said springs, arranged symmetrically on either side of the axis of rotation of the contact bridge, each having one end anchored to the contact bridge and an opposite end anchored to a rod mounted in a notch of the bar and that said contact bridge presents a pair of cams symmetrical with respect to said axis, each arranged to cooperate at the end of the contact bridge of the repulsion travel with one of the rods to slow down the movement of the bridge contact.
  • En fin de course de répulsion, le pont de contacts bute contre l'ancrage d'un ressort, lequel cède progressivement en emmagasinant l'énergie dans le ressort correspondant. At the end of repulsion travel, the contact bridge abuts against the anchorage of a spring, which gradually gives by storing energy in the corresponding spring. Le pont de contacts est ainsi ralenti progressivement et le choc sur la butée de fin de course est limité ou annulé. The contact bridge is thus gradually slowed and shock on the stop limit switch is limited or canceled. Les ancrages sur le barreau sont constitués par des tiges montées dans des encoches permettant un déplacement limité de la tige dans la direction d'élongation du ressort correspondant. Anchors on the bar are constituted by rods mounted in notches permitting limited movement of the rod in the direction of elongation of the corresponding spring. Les mêmes ressorts assurent donc la pression de contacts et l'amortissement du choc du pont de contacts répulsé, et selon un développement de l'invention, ces ressorts constituent également le montage flottant du pont de contacts dans le barreau. The same springs thus provide the contact pressure and the damping of the shock repulsed contact bridge, and according to a development of the invention, these springs also constitute the floating mounting of the contact bridge in the bar. Une partie de l'énergie du pont de contacts est également absorbée par les frottements entre la came et la tige d'ancrage. Part of the energy of the contact bridge is also absorbed by the friction between the cam and the anchoring rod. L'ensemble est agencé de manière à réduire le couple exercé par les ressorts sur le pont de contacts au cours de la course d'ouverture de ce dernier, et dans un premier mode de mise en oeuvre, le mouvement du pont de contacts est simplement freiné en fin de course, et sa refermeture n'est pas empêchée. The assembly is arranged so as to reduce the torque exerted by the springs on the contact bridge in the opening stroke of the latter, and in a first mode of implementation, the movement of the contact bridge is simply slowed late in the race, and resealing is not prevented. L'intensité de freinage est déterminée par le profil de la came et dans un autre mode de mise en oeuvre, ce profil est tel que la résistance des forces agissant sur le pont de contacts en position répulsée verrouille ce pont de contacts en position ouverte. The braking intensity is determined by the profile of the cam and in another mode of implementation, this profile is such that the resistance of the forces acting on the contact bridge in the repelled position locks the contact bridge in the open position. Ce verrouillage peut également résulter d'un véritable accrochage ou encliquetage, le profil de la came présentant par exemple une excavation dans laquelle vient se loger la tige d'ancrage. This lock can also result from a true hooking or snapping, the profile of the cam having such an excavation in which is housed the anchor rod.
  • Il est avantageux de disposer des ressorts de part et d'autre du pont de contacts, les deux ressorts conjugués étant ancrés sur une même tige s'étendant transversalement au pont de contacts. It is advantageous to have the springs either side of the contact bridge, the two conjugates springs being anchored on one stem extending transversely to the contact bridge. Cette disposition symétrique des ressorts, d'une part par rapport au plan longitudinal du pont de contacts, et d'autre part par rapport à l'axe de rotation du pont de contacts, assure un parfait positionnement du pont de contacts en toute position. This symmetrical arrangement of the springs on the one hand with respect to the longitudinal plane of the contact bridge, and secondly with respect to the axis of rotation of the contact bridge, ensures perfect positioning of the contact bridge in any position. Le pont de contacts est symétrique et porte sur ses tranches les deux surfaces de cames, coopérant avec les tiges d'ancrage des ressorts. The contact bridge is symmetrical and covers its edges both surfaces of cams, cooperating with the anchor rods of the springs.
  • L'invention est décrite par la suite dans son application préférentielle à un disjoncteur à boîtier moulé du type décrit dans la demande de brevet français n°91 12793 du 15.10.1991, mais il est clair qu'elle est applicable à d'autres types de disjoncteur limiteur. The invention is described below in its preferred application to a molded case circuit breaker of the type described in the French patent application No. 91 12793 of 15.10.1991, but it is clear that it is applicable to other types limiting circuit breaker.
  • D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre, d'un mode de mise en oeuvre de l'invention, donné à titre d'exemple non limitatif, et représenté aux dessins annexés dans lesquels: Other advantages and features will become more apparent from the following description of an implementation mode of the invention, given by way of example and represented in the accompanying drawings in which:
    • La figure 1 est une vue schématique des contacts d'un pôle d'un disjoncteur selon l'invention, représentés en position fermée. Figure 1 is a schematic view of the contacts of a pole of a circuit breaker according to the invention, shown in closed position.
    • La figure 2 est une vue analogue à celle de la figure 1 montrant les contacts en cours d'ouverture. Figure 2 is a view similar to that of Figure 1 showing the contacts being opened.
    • La figure 3 est une vue analogue à celle de la figure 1 montrant les contacts en position ouverte. Figure 3 is a view similar to that of Figure 1 showing the contacts in the open position.
    • La figure 4 est une coupe suivant la ligne IV IV de la figure 1. Figure 4 is a section along the line IV IV of Figure 1.
    • La figure 5 est une vue de détail en perspective montrant le pont de contact mobile et le barreau de commande. Figure 5 is a detailed perspective view showing the movable contact bridge and the control rod.
  • Sur les figures, une boîte 10, en matière plastique isolante contient les éléments de coupure d'un pôle d'un disjoncteur limiteur à boîtier moulé, en l'occurrence, une paire de contacts fixes 11,12 et un pont de contacts mobile 13, ainsi que deux chambres de coupure non représentées. In the figures, a 10 box of insulating plastic material contains the breaking elements of a pole of a molded case circuit breaker limiter, in this case, a pair of fixed contacts 11,12 and a movable contact bridge 13 and two arc chutes not shown. La boîte 10 de forme générale parallélépipédique est constituée de deux grandes faces latérales 14,15, d'un fond 16 et d'une face supérieure 17, ainsi que de deux petites faces d'extrémités 18,19. 10 the general form parallelepipedic box consists of two large side faces 14,15, a bottom 16 and a top face 17, and two small faces of ends 18,19. Le pont de contacts mobile 13 est porté par un tronçon de barreau 20 rotatif, intercalé entre les deux grandes faces latérales 14,15. The movable contact bridge 13 is carried by a rotating bar section 20 interposed between the two large side faces 14,15. Le tronçon de barreau 20 présente un orifice 21 qui s'étend suivant un diamètre dans une direction parallèle aux grandes faces latérales et le pont de contacts 13 traverse cet orifice avec jeu en faisant saillie de part et d'autre du tronçon de barreau 20. Le pont de contacts 13 est monté flottant sur le tronçon de barreau 20 par deux paires de ressorts 22,23, de la manière décrite en détail par la suite. The bar section 20 has a hole 21 which extends along a diameter in a direction parallel to the large side faces and the contact bridge 13 passes through this opening with play projecting on either side of the bar section 20. the contact bridge 13 is mounted floating on the bar section 20 by two pairs of springs 22,23, as described in detail below. Deux conducteurs d'amenée de courant 24,25 traversent les petites faces d'extrémités, respectivement 18,19 et se prolongent à l'intérieur de la boîte 10 par une partie recourbée en forme de demi-boucle dont l'extrémité 26,27 porte la pièce de contact fixe 28,29 associée. Two current supply conductors 24,25 pass through the smaller end faces, respectively 18,19 and extend inside the box 10 by a curved portion shaped half-loop whose end 26,27 workpiece holder 28,29 associated fixed contact. En position de fermeture du pont de contacts 13, la pièce de contact fixe 28 coopère avec le contact mobile 31 porté par le pont de contacts 13, tandis que la pièce de contact fixe 29 coopère avec le contact mobile 32. Le courant entrant à un instant donné par le conducteur d'amenée 24 parcourt les contacts fermés 28,31, le pont de contacts 13, les contacts fermés 32,29 pour sortir du côté opposé par le conducteur 25. On voit que les extrémités 26,27 sont parcourues par des courants de polarités opposées aux courants traversant le pont de contacts 13, en engendrant une force de répulsion déplaçant le pont de contacts 13 vers la position d'ouverture. In the closed position of the contact bridge 13, the fixed contact piece 28 cooperates with the movable contact 31 carried by the contact bridge 13, while the fixed contact piece 29 cooperates with the movable contact 32. The current flowing to a given time by the feed conductor 24 runs through the closed contacts 28,31, the contact bridge 13, the contacts 32,29 closed to output the opposite side by the driver 25. it is seen that the ends 26,27 are traversed by current of opposite polarity to the current passing through the contact bridge 13, generating a repulsive force that moves the contact bridge 13 to the open position. Cette trajectoire en boucle dans la zone des contacts 28,31; This loop path in the contact zone 28,31; 29,32 engendre un champ magnétique de soufflage de l'arc en direction des chambres de coupure. 29,32 generates a blowing magnetic field of the arc towards the arc extinguishing chambers. Un mécanisme de commande (non représenté) est accouplé au tronçon de barreau 20 pour commander sa rotation et de ce fait, l'ouverture et la fermeture des contacts 28,31; A control mechanism (not shown) is coupled to the bar section 20 for controlling its rotation and thereby the opening and closing of the contacts 28,31; 29,32. 29.32. Un tel disjoncteur est décrit en détail dans la demande de brevet français précitée n°91 12793 à laquelle on se reportera avantageusement pour de plus amples détails. A circuit breaker is described in detail in the aforementioned French patent application No. 91 12793 to which reference will advantageously for further details.
  • Les parties des conducteurs d'amenée de courant 24,25, internes à la boîte 10, sont sensiblement symétriques et seule la disposition du conducteur d'amenée 25 est décrite en détail ci-dessous, celle du conducteur d'amenée 24 étant identique. The portions of the current supply conductors 24,25, internal to the box 10, are substantially symmetrical and only the disposition of the supply conductor 25 is described in detail below, that of the feed conductor 24 being identical. Le conducteur d'amenée 25 accolé au fond 16 est engagé latéralement dans les encoches 30 ménagées dans les deux grandes faces latérales 14,15. The feed conductor 25 attached to the base 16 is engaged laterally in the slots 30 formed in the two large side faces 14,15. La largeur du conducteur méplat 25 est réduite dans la zone recourbée et à son extrémité 27, en ménageant un jeu entre le conducteur et les grandes faces latérales 14,15. The width of the strip conductor 25 is reduced in the curved region and at its end 27, by providing a clearance between the driver and the large side faces 14,15. Une enclume 33 est intercalée entre les deux branches de la demi-boucle du conducteur 25, en étant accolée à la face de l'extrémité 27 opposée à celle portant le contact fixe 29. L'enclume 33 est rigidement assujettie à la boîte 10 par ses extrémités 35, engagées dans des rainures 36 ménagées dans les grandes faces latérales 14,15. An anvil 33 is interposed between the two arms of the half-loop of the conductor 25, being contiguous to the face of the end 27 opposite that carrying the fixed contact 29. The anvil 33 is rigidly secured to the box 10 by its ends 35 engaged in grooves 36 formed in the large side faces 14,15. L'enclume 33 est séparée de l'autre branche du conducteur 25 par un entrefer 34 et le bloc métallique est feuilleté pour limiter les courants de Foucault engendrés dans le bloc 33. On comprend que lorsque le pont de contacts 13 se ferme, le contact mobile 32 vient frapper le contact fixe 29 et le choc est transmis à l'enclume 33 qui évite tout rebondissement du contact fixe 29 et amplifie le coup porté sur le contact fixe 29. Ce coup provoque un écrasement des surfaces en contact et une réduction de la résistance de contact, laquelle ne présente aucune dispersion. The anvil 33 is separated from the other part of the conductor 25 by a gap 34 and the metal block is laminated to reduce the eddy currents generated in the block 33. It is understood that when the contact bridge 13 closes, the contact mobile 32 strikes the fixed contact 29 and the shock is transmitted to the anvil 33 which prevents any bouncing of the fixed contact 29 and amplifies the blow on the fixed contact 29. This blow causes crushing of the contact surfaces and a reduction in the contact resistance, which has no dispersion. Le bloc métallique 33 est en un matériau ferromagnétique augmentant le champ magnétique engendré par le passage du courant dans le conducteur d'amenée 25, pour souffler l'arc en direction de la chambre de coupure. The metal block 33 is made of a ferromagnetic material increases the magnetic field generated by the current flow in the feed conductor 25, for blowing the arc toward the arc chute. L'entrefer 34 évite tout court-circuitage de la demi-boucle mais il est clair qu'une isolation additionnelle peut être prévue. The gap 34 prevents any shorting of the half-loop but it is clear that additional isolation may be provided.
  • En se référant plus particulièrement à la figure 5, on voit que les ressorts des paires de ressorts 22,23 sont disposés symétriquement de part et d'autre du pont de contacts 13, en encadrant ce dernier. With particular reference to Figure 5, it is seen that the springs of the pairs of springs 22,23 are disposed symmetrically on either side of the contact bridge 13, by framing it. D'autre part, les deux paires de ressorts 22,23 sont disposées symétriquement par rapport à l'axe fictif 37 de rotation du pont de contacts 13. L'une 38 des extrémités des ressorts 22 est ancrée à un axe 39 s'étendant parallèlement à l'axe fictif 37 et prenant appui dans une encoche 40 ménagée sur la face du pont de contacts 13, opposée à celle portant le contact mobile 32. L'autre extrémité 41 des ressorts de traction 22 est ancrée à une tige 42 montée à coulissement dans une encoche 43 ménagée dans le barreau 20. Les ressorts de traction 22 sollicitent la tige 42 vers le fond des encoches 43 et exercent par l'axe 39 un couple sur le pont de contacts 13 tendant à faire pivoter ce dernier en direction de fermeture. On the other hand, the two pairs of springs 22,23 are arranged symmetrically relative to the imaginary axis 37 of the contact bridge 13. One rotation of the ends 38 of the springs 22 is anchored to a pin 39 extending parallel to the imaginary axis 37 and supported in a notch 40 formed on the side of the contact bridge 13, opposite that carrying the movable contact 32. the other end 41 of tension spring 22 is anchored to a shaft 42 mounted to slide in a slot 43 formed in the bar 20. the tension springs 22 bias the rod 42 toward the bottom of the notches 43 and engaged by the pin 39 a torque on the contact bridge 13 tending to pivot the latter in the direction closing. Les ressorts 23 sont agencés de la même manière, et les mêmes numéros de repères affectés d'un indice sont utilisés pour désigner les parties correspondantes. The springs 23 are arranged in the same manner, and the same reference numbers assigned an index are used to designate the corresponding parts. Les deux paires de ressorts 22,23 assurent un montage flottant du pont de contacts 13 dans l'orifice 21 en permettant une rotation du pont de contacts 13 autour de l'axe fictif 37. Un tel montage flottant est décrit dans le brevet français n°2.622.347. The two pairs of springs 22,23 provide floating mounting of the contact bridge 13 in the orifice 21 allowing rotation of the contact bridge 13 about the imaginary axis 37. Such a floating mounting is disclosed in French patent n ° 2622347. Les paires de ressorts 22, 23 assurent également la pression de contact en position de fermeture du pôle. The pairs of springs 22, 23 also ensure the contact pressure of the pole in the closed position. Les paires de ressorts 22,23 sont disposées symétriquement par rapport à l'axe fictif de rotation 37, de façon à exercer en toute position du pont de contacts 13, un couple de rappel du pont de contacts 13 en position de fermeture. The pairs of springs 22,23 are arranged symmetrically relative to the imaginary axis of rotation 37, so as to exert in any position of the contact bridge 13, a restoring torque of the contact bridge 13 in the closed position. Ce couple diminue au fur et à mesure du déplacement du pont de contacts 13 vers la position d'ouverture, et les tiges d'ancrage 42,42' sont disposées de manière à interférer avec la trajectoire de pivotement du pont de contacts 13, en fin de course d'ouverture par répulsion du pont de contacts 13. A cet effet, les tranches du pont de contacts 13 portent ou sont conformées en surface de came 44,44' engageant en fin de course de répulsion, respectivement les tiges 42,42', en les faisant coulisser dans leur encoche 43, en direction d'élongation des ressorts 22,23. This torque decreases and measuring the displacement of the contact bridge 13 to the open position, and the anchoring rods 42,42 'are arranged to interfere with the pivoting path of the contact bridge 13, in end of opening travel by repulsion of the contact bridge 13. for this purpose, the edges of the contact bridge 13 are or are constructed as cam surface 44,44 'engaging the end of repulsion travel, the rods 42 respectively, 42 ', by sliding in its slot 43 in the direction of elongation of the springs 22,23. Cet engagement freine le mouvement du pont de contacts 13, et réduit ou annule le choc sur la butée de fin de course d'ouverture, par exemple constituée ou agencée sur le boîtier 10. Le profil des cames 44,44' est bien entendu déterminé pour obtenir une décelération progressive du pont de contacts 13 et il peut être agencé pour conserver en toute position un couple de rappel du pont de contacts vers la position de fermeture, ou inversement présenter un encliquetage de retenue du pont de contacts 13, en position répulsée ouverte. This engagement inhibits the movement of the contact bridge 13, and reduces or cancels the shock on the abutment end of opening travel, for example, formed or arranged on the housing 10. The profile of the cams 44,44 'is of course determined to obtain a progressive deceleration of the contact bridge 13 and it may be arranged to store in any position a restoring moment of the contact bridge towards the closed position, or conversely present a retaining latching of the contact bridge 13 in the repelled position opened. Dans le premier cas, le pont de contacts 13 se referme automatiquement si l'ouverture du disjoncteur n'est pas confirmée par la rotation du tronçon de barreau 20 commandée par le mécanisme, mais la course aller-retour du pont de contacts 13 est ralentie par son freinage en fin de course. In the first case, the contact bridge 13 closes automatically if the circuit breaker is not confirmed by the rotation of the bar section 20 controlled by the mechanism, but the return stroke of the contact bridge 13 is slowed by its braking end position. Ce ralentissement peut être suffisant pour assurer des sélectivités de déclenchement, en l'occurrence une ouverture d'un appareil en aval qui élimine le défaut. This slowing can be sufficient to ensure tripping selectivities, in this case an opening of a downstream device that eliminates the fault. Dans le deuxième cas de retenue du pont de contacts 13 en position de répulsion, cet encliquetage est supprimé lors de la rotation du tronçon de barreau 20, actionné par le mécanisme, de manière à ramener le pont de contacts 13 dans la position initiale par rapport au barreau 20. Il est facile de voir que le système de freinage et/ou de retenue du pont de contacts 13, en position de répulsion ne nécessite aucune pièce additionnelle, et est particulièrement simple et efficace. In the second case holding the contact bridge 13 in the repulsion position, the detent is removed during rotation of the bar portion 20, actuated by the mechanism, so as to bring the contact bridge 13 in the initial position with respect Bar 20. It is easy to see that the brake system and / or holding of the contact bridge 13 by repulsion position requires no additional part, which is particularly simple and effective.
  • L'invention est bien entendu nullement limitée au mode de mise en oeuvre plus particulièrement décrit. The invention is of course not limited to the implementation mode specifically described.

Claims (10)

1. Disjoncteur basse tension à boîtier moulé comprenant un pont de contacts rotatif (13), une paire de contacts fixes (11,12) coopérant avec ledit pont de contacts, des conducteurs (24,25) d'amenée de courant auxdits contacts fixes agencés pour engendrer des forces électrodynamiques de répulsion du pont de contacts (13) en position répulsée d'ouverture lors d'un passage d'un courant de court-circuit, un barreau rotatif (20) ayant un orifice (21) transversal de logement avec jeu dudit pont de contacts,lequel fait saillie de part et d'autre du barreau (20), au moins une paire de ressorts de traction (22,23) intercalés entre le barreau (20) et le pont de contacts (13) pour assurer une pression de contact du pont de contacts sur les contacts fixes (11,12) en position de fermeture du disjoncteur, tout en autorisant une rotation du pont de contacts sous l'action desdites forces électrodynamiques vers la position répulsée d'ouverture, caractérisé en ce que lesdits ressorts (22 1. Low voltage circuit breaker with a molded case comprising a rotary contact bridge (13), a pair of stationary contacts (11,12) cooperating with said contact bridge, conductors (24,25) of current supply to said fixed contacts arranged to generate electrodynamic forces repelling the contact bridge (13) in the repelled open position when a transition from a short-circuit current, a rotating bar (20) having an orifice (21) transverse housing with clearance said contact bridge, which protrudes from both sides of the bar (20), at least one pair of tension springs (22,23) interposed between the bar (20) and the contact bridge (13) to ensure a contact pressure of the contact bridge on the stationary contacts (11,12) in the circuit breaker closed position, while allowing rotation of the contact bridge under the action of said electrodynamic forces to the repelled open position, characterized in that said springs (22 ,23), disposés symétriquement de part et d'autre de l'axe de rotation (37) du pont de contacts (13), présentent chacun une extrémité (38,38') ancrée au pont de contacts (13) et une extrémité opposée (41,41') ancrée à une tige (42,42') montée dans une encoche (43) du barreau (20) et que ledit pont de contacts (13) présente une paire de cames (44,44') symétriques par rapport audit axe (37), chacune agencée pour coopérer en fin de course de répulsion du pont de contacts avec l'une des tiges (42,42') pour freiner le mouvement du pont de contacts. , 23), arranged symmetrically on either side of the axis of rotation (37) of the contact bridge (13) each have an end (38,38 ') anchored to the contact bridge (13) and an end opposite (41,41 ') anchored to a rod (42,42') mounted in a notch (43) of the bar (20) and that said contact bridge (13) has a pair of cams (44,44 ') symmetrical relative to said axis (37), each arranged to cooperate at the end of the contact bridge of the repulsion travel with one of the rods (42,42 ') for braking the movement of the contact bridge.
2. Disjoncteur selon la revendication 1, caractérisé en ce que ladite tige (42,42') est montée à coulissement limité dans ladite encloche (43) ménagée dans le barreau (20), ladite encoche s'étendant sensiblement dans la ligne d'action du ressort associé (22,23) et que les deux encoches (43), ménagées dans le barreau, sont diamétralement opposées. 2. Circuit breaker according to Claim 1, characterized in that said rod (42,42 ') is limited slidably mounted in said encloche (43) in the rod (20), said notch extending appreciably in the line action of the associated spring (22,23) and that the two notches (43) formed in the bar, are diametrically opposed.
3. Disjoncteur selon la revendication 1 ou 2, caractérisé en ce que lesdits ressorts (22,23) positionnent élastiquement le pont de contacts (13) dans l'orifice (21) du barreau (20) en définissant un axe fictif de rotation (37) du pont de contacts par rapport au barreau. 3. Circuit breaker according to Claim 1 or 2, characterized in that said springs (22,23) resiliently position the contact bridge (13) in the orifice (21) of the bar (20) defining a fictitious rotation axis ( 37) of the contact bridge with respect to the bar.
4. Disjoncteur selon la revendication 1, 2 ou 3, caractérisé en ce que le profil de la came (44,44') impose un déplacement de la tige (42,42') dans l'encoche (43) et une élongation progressive du ressort de traction (22,23) correspondant au cours du pivotement du pont de contacts (13) vers la position répulsée avec une accumulation d'énergie dans le ressort. 4. Circuit breaker according to Claim 1, 2 or 3, characterized in that the cam profile (44,44 ') imposes a movement of the rod (42,42') in the notch (43) and a progressive elongation the tension spring (22,23) corresponding during the pivoting of the contact bridge (13) to the repelled position with an accumulation of energy in the spring.
5. Disjoncteur selon l'une quelconque des revendications yrécédentes, caractérisé en ce que le profil de la came est agencé pour engendrer une force d'accrochage du pont de contacts (13) en position répulsée. 5. Circuit breaker according to any one of yrécédentes claims, characterized in that the profile of the cam is arranged to generate a latching force of the contact bridge (13) in the repelled position.
6. Disjoncteur selon la revendication 5, caractérisé en ce que le profil de la came (44,44') est agencé pour engendrer un encliquetage du pont de contacts (13) en position répulsée. 6. Circuit breaker according to Claim 5, characterized in that the cam profile (44,44 ') is arranged to generate a latching of the contact bridge (13) in the repelled position.
7. Disjoncteur selon la revendication 5 ou 6, caractérisé en ce que le barreau (20) est monté à rotation et est actionné par un mécanisme d'ouverture du disjoncteur et que la course d'ouverture du pont de contacts (13) est limitée de façon que la rotation du barreau dégage la tige (42,42') de la came (44,44') associée au cours du mouvement d'ouverture. 7. Circuit breaker according to Claim 5 or 6, characterized in that the bar (20) is rotatably mounted and is actuated by a circuit breaker opening mechanism and that the contact bridge opening stroke (13) is limited so that rotation of the bar releases the rod (42,42 ') of the cam (44,44') associated in the opening movement.
8. Disjoncteur selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au cours du pivotement du pont de contacts (13) vers la position répulsée la ligne d'action de chaque ressort se déplace en réduisant le bras de levier et ainsi le couple de rappel exercé par le ressort (22,23) sur le pont de contacts. 8. Circuit breaker according to any one of the preceding claims, characterized in that during pivoting of the contact bridge (13) to the repelled position the line of action of each spring moves reducing the lever arm and, the return torque exerted by the spring (22,23) on the contact bridge.
9. Disjoncteur selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite paire de ressorts (22,23) est disposée latéralement d'un côté du pont de contacts (13) et qu'une deuxième paire de ressorts est disposée symétriquement de l'autre côté du pont de contacts et que ladite tige (42,42') est un axe transversal dont les deux extrémités constituent les points d'ancrage des deux ressorts situés symétriquement de part et d'autre du pont de contacts. 9. Circuit breaker according to any one of the preceding claims, characterized in that said pair of springs (22,23) is disposed laterally on one side of the contact bridge (13) and a second pair of springs is arranged symmetrically on the other side of the contact bridge and that said rod (42,42 ') is a transverse spindle both ends of which constitute the anchoring points of the two springs located symmetrically on either side of the contact bridge.
10. Disjoncteur selon la revendication 9, caractérisé en ce que ladite came (44,44') est ménagée sur la tranche du pont de contacts (13) opposée aux contacts pour engager en fin de course de répulsion le tronçon central dudit axe transversal (42,42'). 10. Circuit breaker according to Claim 9, characterized in that said cam (44,44 ') is provided on the edge of the contact bridge (13) opposite from the contacts to engage the end of repulsion travel the central section of said transverse axis ( 42.42 ').
EP19930420100 1992-03-13 1993-03-05 Moulded-case circuit breaker with retardation at the end of the contact bridges repulsion movement Expired - Lifetime EP0560697B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR9203142 1992-03-13
FR9203142A FR2688626B1 (en) 1992-03-13 1992-03-13 Molded case circuit breaker has bridge contacts brakes at the end of repulsion travel.

Publications (2)

Publication Number Publication Date
EP0560697A1 true EP0560697A1 (en) 1993-09-15
EP0560697B1 EP0560697B1 (en) 1996-09-04

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US (1) US5310971A (en)
EP (1) EP0560697B1 (en)
JP (1) JP3352750B2 (en)
DE (2) DE69304374T2 (en)
ES (1) ES2092792T3 (en)
FR (1) FR2688626B1 (en)

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ES2267381A1 (en) * 2004-04-16 2007-03-01 Ls Industrial Systems Co., Ltd Movable contactor assembly for circuit breaker, has rotation shaft with holding groove surfaces receiving slide pins on outer surface of shaft, such that motion of movable contactor is delayed to return to fixed contactors
ES2304271A1 (en) * 2004-10-07 2008-10-01 Ls Industrial Systems Co. Ltd Contactor assembly for circuit circuit.
US8071898B2 (en) 2007-08-21 2011-12-06 Siemens Aktiengesellschaft Switching device with a switching shaft for mounting a rotary contact link and multipole switching device arrangement
WO2011033181A1 (en) 2009-09-18 2011-03-24 Schneider Electric Industries Sas Single-pole cutoff unit comprising a rotary contact bridge, cutoff device comprising such a unit, and circuit breaker comprising such a device
CN102612723A (en) * 2009-09-18 2012-07-25 施耐德电器工业公司 Single-pole cutoff unit comprising a rotary contact bridge, cutoff device comprising such a unit, and circuit breaker comprising such a device
CN102612723B (en) * 2009-09-18 2015-08-12 施耐德电器工业公司 The one pole switching units comprising rotary contact bridge, the switching device comprising such unit and comprise the circuit breaker of such device
US9953789B2 (en) 2009-09-18 2018-04-24 Schneider Electric Industries Sas Single-pole breaking unit comprising a rotary contact bridge, and a switchgear device, and circuit breaker comprising such a unit
US9299518B2 (en) 2012-08-29 2016-03-29 Siemens Aktiengesellschaft Rotor for an electric switch
CN103745897A (en) * 2014-01-06 2014-04-23 大全集团有限公司 Conducting rod for current-limiting molded case circuit breaker and moving contact assembly
CN103745897B (en) * 2014-01-06 2016-06-22 南京大全电气研究院有限公司 A kind of conducting rod for current-limiting type molded case breaker and moving contact component
CN106783442A (en) * 2016-12-12 2017-05-31 上海电器股份有限公司人民电器厂 A kind of contact system of dual-interruption point breaker

Also Published As

Publication number Publication date
FR2688626A1 (en) 1993-09-17
DE69304374D1 (en) 1996-10-10
JPH0652777A (en) 1994-02-25
FR2688626B1 (en) 1994-05-06
JP3352750B2 (en) 2002-12-03
US5310971A (en) 1994-05-10
DE69304374T2 (en) 1997-02-20
EP0560697B1 (en) 1996-09-04
ES2092792T3 (en) 1996-12-01

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