EP0560697B1 - 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
EP0560697B1
EP0560697B1 EP93420100A EP93420100A EP0560697B1 EP 0560697 B1 EP0560697 B1 EP 0560697B1 EP 93420100 A EP93420100 A EP 93420100A EP 93420100 A EP93420100 A EP 93420100A EP 0560697 B1 EP0560697 B1 EP 0560697B1
Authority
EP
European Patent Office
Prior art keywords
contact bridge
circuit breaker
bar
springs
breaker according
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.)
Expired - Lifetime
Application number
EP93420100A
Other languages
German (de)
French (fr)
Other versions
EP0560697A1 (en
Inventor
Denis Vial
Jean Bonfils
Marc Rival
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Schneider Electric SE
Original Assignee
Schneider Electric SE
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Application filed by Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0560697A1 publication Critical patent/EP0560697A1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/205—Details concerning the elastic mounting of the rotating bridge in the rotor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective 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
    • H01H73/02—Details
    • H01H73/04—Contacts
    • H01H73/045—Bridging contacts
    • 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
    • H01H77/102—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 characterised by special mounting of contact arm, allowing blow-off movement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/2058—Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/60—Mechanical arrangements for preventing or damping vibration or shock
    • 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
    • H01H71/1081—Modifications for selective or back-up protection; Correlation between feeder and branch circuit breaker
    • 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
    • H01H77/102—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 characterised by special mounting of contact arm, allowing blow-off movement
    • H01H77/104—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 characterised by special mounting of contact arm, allowing blow-off movement with a stable blow-off position
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H01H9/446—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using magnetisable elements associated with the contacts

Definitions

  • the invention relates to a low-voltage circuit breaker with molded housing comprising a rotary contact bridge, a pair of fixed contacts cooperating with said contact bridge, current supply conductors to said fixed contacts arranged to generate electrodynamic repulsion forces.
  • a rotary bar having a transverse orifice for housing with the eu of said contact bridge, which projects from both sides other of the bar, at least one pair of tension springs interposed between the bar and the contact bridge to ensure contact pressure of the contact bridge on the fixed contacts in the closed position of the circuit breaker, while allowing rotation of the bridge contacts under the action of said electrodynamic forces towards the repulsed open position, said springs being arranged symmetrically on either side of the axis of rotation of the contact bridge and each having one end anchored to the contact bridge.
  • the contact bridge opens quickly under the action of electrodynamic repulsion forces during the appearance short-circuit current.
  • the rapid cut-off ensures a limitation of the current and as soon as the current disappears, the contact bridge tends to return to the closed position.
  • the return of the contact bridge to the closed position by the springs acting on this contact bridge is accentuated by the rebound of the contact bridge on the repulsion end-of-travel stop.
  • the present invention aims to allow the realization of a simple braking device and possibly hooking of the movable contact bridge requiring no additional part.
  • the contact bridge At the end of the repulsion stroke, the contact bridge abuts against the anchoring of a spring, which gradually yields while storing energy in the corresponding spring.
  • the contact bridge is thus gradually slowed down and the impact on the limit stop is limited or canceled.
  • the anchorages on the bar are constituted by rods slidably mounted in notches allowing preferably limited movement of the rod in the direction of elongation of the corresponding spring.
  • the same springs therefore ensure the contact pressure and shock absorption of the 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. Part of the energy of the contact bridge is also absorbed by the friction between the cam and the anchor rod.
  • the assembly is arranged so as to reduce the torque exerted by the springs on the contact bridge during the opening stroke of the latter, and in a first embodiment, the movement of the contact bridge is simply braked at the end of the race, and its reclosing is not prevented.
  • the braking intensity is determined by the profile of the cam and in another embodiment, this profile is such that the resistance of the forces acting on the contact bridge in the repelled position locks this contact bridge in the open position. This locking can also result from a real hooking or snap-fastening, the profile of the cam having for example an excavation in which is housed the anchor rod.
  • Figure 1 is a schematic view of the contacts of a pole of a circuit breaker according to the invention, shown in the closed position.
  • Figure 2 is a view similar to that of Figure 1 showing the contacts being opened.
  • Figure 3 is a view similar to that of Figure 1 showing the contacts in the open position.
  • Figure 4 is a section along the line IV-IV of Figure 1.
  • Figure 5 is a detailed perspective view showing the movable contact bridge and the control rod.
  • a box 10 made of insulating plastic material, contains the cut-off elements of a pole of a limiting circuit breaker with molded housing, in this case, a pair of fixed contacts 11,12 and a movable contact bridge 13 , as well as two interrupting chambers not shown.
  • the box 10 of generally parallelepipedal shape consists of two large lateral faces 14,15, a bottom 16 and an upper face 17, as well as two small end faces 18,19.
  • the mobile contact bridge 13 is carried by a rotary bar section 20, interposed between the two large lateral faces 14,15.
  • the bar section 20 has an orifice 21 which extends along a diameter in a direction parallel to the large lateral faces and the contact bridge 13 crosses this orifice 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, in the manner described in detail below.
  • Two current supply conductors 24.25 pass through the small end faces, respectively 18.19 and extend inside the box 10 by a curved part in the form of a half-loop whose end 26.27 carries the associated fixed contact part 28, 29.
  • the fixed contact part 28 cooperates with the movable contact 31 carried by the contact bridge 13, while the fixed contact part 29 cooperates with the mobile contact 32.
  • the parts of the current supply conductors 24.25, internal to the box 10, are substantially symmetrical and only the arrangement of the supply conductor 25 is described in detail below, that of the supply conductor 24 being identical.
  • the supply conductor 25 attached to the bottom 16 is engaged laterally in the notches 30 formed in the two large lateral faces 14,15.
  • the width of the flat conductor 25 is reduced in the curved zone and at its end 27, leaving a clearance between the conductor and the large lateral faces 14,15.
  • An anvil 33 is interposed between the two branches of the half-loop of the conductor 25, being attached to the face of the end 27 opposite to 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 lateral faces 14,15.
  • the anvil 33 is separated from the other branch of the conductor 25 by an air gap 34 and the metal block is laminated to limit 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 rebound of the fixed contact 29 and amplifies the blow on the fixed contact 29. This blow causes crushing of the surfaces in contact and a reduction in contact resistance, which has no dispersion.
  • the metal block 33 is made of a ferromagnetic material increasing the magnetic field generated by the passage of current in the supply conductor 25, to blow the arc in the direction of the breaking chamber.
  • the air gap 34 avoids any short-circuiting of the half-loop but it is clear that additional insulation can be planned.
  • the springs of the pairs of springs 22, 23 are arranged symmetrically on either side of the contact bridge 13, surrounding the latter.
  • the two pairs of springs 22, 23 are arranged symmetrically with respect to the imaginary axis 37 of rotation of the contact bridge 13.
  • One 38 of the ends of the springs 22 is anchored to an axis 39 extending parallel to the imaginary axis 37 and bearing in a notch 40 formed on the face of the contact bridge 13, opposite to that carrying the movable contact 32.
  • the other end 41 of the tension springs 22 is anchored to a rod 42 mounted sliding in a notch 43 formed in the bar 20.
  • the tension springs 22 urge the rod 42 towards the bottom of the notches 43 and exert by the axis 39 a torque on the contact bridge 13 tending to pivot the latter in the direction closing.
  • the springs 23 are arranged in the same way, and the same reference numbers assigned an index are used to designate the corresponding parts.
  • the two pairs of springs 22, 23 ensure a floating mounting of the contact bridge 13 in the orifice 21 by allowing rotation of the contact bridge 13 around the imaginary axis 37. Such a floating mounting is described in French patent n ° 2.622.347.
  • the pairs of springs 22, 23 also provide the contact pressure in the closed position of the pole.
  • the pairs of springs 22, 23 are arranged symmetrically with respect to the imaginary axis of rotation 37, so as to exert in any position of the contact bridge 13, a return torque of the contact bridge 13 in the closed position.
  • This torque decreases as the contact bridge 13 moves towards the open position, and the anchor rods 42, 42 ′ are arranged so as to interfere with the pivoting path of the contact bridge 13, in end of opening stroke by repulsion of the contact bridge 13.
  • the edges of the contact bridge 13 carry or are shaped on the cam surface 44, 44 ′ engaging the rods 42, respectively, at the end of the repulsion travel, 42 ', by sliding them in their notch 43, towards elongation of the springs 22,23.
  • This engagement brakes the movement of the contact bridge 13, and reduces or cancels the impact on the opening end-of-travel stop, 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 can be arranged to keep in any position a restoring torque of the contact bridge towards the closed position, or conversely present a retaining snap of the contact bridge 13, in the repelled position opened.
  • the contact bridge 13 closes automatically if the opening of the circuit breaker is not confirmed by the rotation of the bar section 20 controlled by the mechanism, but the return travel of the contact bridge 13 is slowed down. by its braking at the end of the race.
  • This slowing down may be sufficient to ensure trigger selectivities, in this case an opening of a downstream device which eliminates the fault.
  • this snap-fastening is eliminated during the rotation of the bar section 20, actuated by the mechanism, so as to bring the contact bridge 13 back to the initial position relative to to the bar 20. It is easy to see that the braking and / or retaining system of the contact bridge 13, in the repulsion position does not require any additional part, and is particularly simple and effective.

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, lesdits ressorts étant disposés symétriquement de part et d'autre de l'axe de rotation du pont de contacts et présentant chacun une extrémité ancrée au pont de contacts.The invention relates to a low-voltage circuit breaker with molded housing comprising a rotary contact bridge, a pair of fixed contacts cooperating with said contact bridge, current supply conductors to said fixed contacts arranged to generate electrodynamic repulsion forces. of the contact bridge in the repulsed open position during the passage of a short-circuit current, a rotary bar having a transverse orifice for housing with the eu of said contact bridge, which projects from both sides other of the bar, at least one pair of tension springs interposed between the bar and the contact bridge to ensure contact pressure of the contact bridge on the fixed contacts in the closed position of the circuit breaker, while allowing rotation of the bridge contacts under the action of said electrodynamic forces towards the repulsed open position, said springs being arranged symmetrically on either side of the axis of rotation of the contact bridge and each having one end anchored to the contact bridge.

Dans un disjoncteur limiteur du genre mentionné (voir par exemple FR-A-2 622 347 & EP-A-0 314 540), 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. La coupure rapide assure une limitation du courant et dès la disparition du courant, le pont de contacts tend à revenir en position fermée. 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. 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. Un disjoncteur connu comporte un accrochage maintenant le contact répulsé en position d'ouverture pour éviter toute refermeture intempestive des contacts. Ce dispositif nécessite des pièces additionnelles d'accrochage et par la suite de libération du contact.In a limiting circuit breaker of the type mentioned (see for example FR-A-2 622 347 & EP-A-0 314 540), the contact bridge opens quickly under the action of electrodynamic repulsion forces during the appearance short-circuit current. The rapid cut-off ensures a limitation of the current and as soon as the current disappears, the contact bridge tends to return to the closed position. The return of the contact bridge to the closed position by the springs acting on this contact bridge is accentuated by the rebound of the contact bridge on the repulsion end-of-travel stop. These combined effects can cause the contacts to close again before the opening mechanism is confirmed by the trip mechanism, or before the intervention of the downstream circuit breaker in a selective device. A known circuit breaker includes an attachment keeping the repulsed contact in the open position to avoid any untimely closing of the contacts. This device requires additional attachment parts and subsequently contact release.

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 hooking of the movable contact bridge requiring no additional part.

Ce but est atteint par le disjoncteur selon l'invention tel que défini dans la revendication 1.This object is achieved by the circuit breaker according to the invention as defined in claim 1.

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. Le pont de contacts est ainsi ralenti progressivement et le choc sur la butée de fin de course est limité ou annulé. Les ancrages sur le barreau sont constitués par des tiges montées à coulissement dans des encoches permettant un déplacement de préférence limité de la tige dans la direction d'élongation du ressort correspondant. 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. Une partie de l'énergie du pont de contacts est également absorbée par les frottements entre la came et la tige d'ancrage. 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. 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. 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.At the end of the repulsion stroke, the contact bridge abuts against the anchoring of a spring, which gradually yields while storing energy in the corresponding spring. The contact bridge is thus gradually slowed down and the impact on the limit stop is limited or canceled. The anchorages on the bar are constituted by rods slidably mounted in notches allowing preferably limited movement of the rod in the direction of elongation of the corresponding spring. The same springs therefore ensure the contact pressure and shock absorption of the 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. Part of the energy of the contact bridge is also absorbed by the friction between the cam and the anchor rod. The assembly is arranged so as to reduce the torque exerted by the springs on the contact bridge during the opening stroke of the latter, and in a first embodiment, the movement of the contact bridge is simply braked at the end of the race, and its reclosing is not prevented. The braking intensity is determined by the profile of the cam and in another embodiment, this profile is such that the resistance of the forces acting on the contact bridge in the repelled position locks this contact bridge in the open position. This locking can also result from a real hooking or snap-fastening, the profile of the cam having for example 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. 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. Le pont de contacts est symétrique et porte sur ses tranches les deux surfaces de cames, coopérant avec les tiges d'ancrage des ressorts.It is advantageous to have springs on either side of the contact bridge, the two conjugate springs being anchored on the same rod extending transversely to the contact bridge. This symmetrical arrangement of the springs, on the one hand with respect to the longitudinal plane of the contact bridge, and on the other hand with respect to the axis of rotation of the contact bridge, ensures perfect positioning of the contact bridge in any position. The contact bridge is symmetrical and carries on its edges the two cam surfaces, 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 EP-A-0 542 636 (état de la technique selon l'article 54(3) CBE), 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 application EP-A-0 542 636 (state of the art according to article 54 (3) EPC), but it is It is clear that it is applicable to other types of 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, et représenté aux dessins annexés dans lesquels:Other advantages and characteristics will emerge more clearly from the description which follows, of an embodiment of the invention, given by way of example, and represented in the appended 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 the 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. 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. Le pont de contacts mobile 13 est porté par un tronçon de barreau 20 rotatif, intercalé entre les deux grandes faces latérales 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. 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. 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. Cette trajectoire en boucle dans la zone des contacts 28,31; 29,32 engendre un champ magnétique de soufflage de l'arc en direction des chambres de coupure. 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; 29,32. Un tel disjoncteur est décrit en détail dans la demande de brevet précitée EP-A-0 542 636 à laquelle on se reportera avantageusement pour de plus amples détails.In the figures, a box 10, made of insulating plastic material, contains the cut-off elements of a pole of a limiting circuit breaker with molded housing, in this case, a pair of fixed contacts 11,12 and a movable contact bridge 13 , as well as two interrupting chambers not shown. The box 10 of generally parallelepipedal shape consists of two large lateral faces 14,15, a bottom 16 and an upper face 17, as well as two small end faces 18,19. The mobile contact bridge 13 is carried by a rotary bar section 20, interposed between the two large lateral faces 14,15. The bar section 20 has an orifice 21 which extends along a diameter in a direction parallel to the large lateral faces and the contact bridge 13 crosses this orifice 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, in the manner described in detail below. Two current supply conductors 24.25 pass through the small end faces, respectively 18.19 and extend inside the box 10 by a curved part in the form of a half-loop whose end 26.27 carries the associated fixed contact part 28, 29. In the closed position of the contact bridge 13, the fixed contact part 28 cooperates with the movable contact 31 carried by the contact bridge 13, while the fixed contact part 29 cooperates with the mobile contact 32. The incoming current to a instant given by the supply conductor 24 travels through the closed contacts 28, 31, the contact bridge 13, the closed contacts 32, 29 to exit from the opposite side by the conductor 25. It can be seen that the ends 26, 27 are traversed by currents of opposite polarities to the currents crossing the contact bridge 13, generating a repulsive force moving the contact bridge 13 towards the open position. This loop path in the contact area 28,31; 29.32 generates a field magnetic arc blowing in the direction of the breaking chambers. A control mechanism (not shown) is coupled to the bar section 20 to control its rotation and therefore, the opening and closing of the contacts 28,31; 29.32. Such a circuit breaker is described in detail in the aforementioned patent application EP-A-0 542 636 to which reference will advantageously be made 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. 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. 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. 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. 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. 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. L'entrefer 34 évite tout court-circuitage de la demi-boucle mais il est clair qu'une isolation additionnelle peut être prévue.The parts of the current supply conductors 24.25, internal to the box 10, are substantially symmetrical and only the arrangement of the supply conductor 25 is described in detail below, that of the supply conductor 24 being identical. The supply conductor 25 attached to the bottom 16 is engaged laterally in the notches 30 formed in the two large lateral faces 14,15. The width of the flat conductor 25 is reduced in the curved zone and at its end 27, leaving a clearance between the conductor and the large lateral faces 14,15. An anvil 33 is interposed between the two branches of the half-loop of the conductor 25, being attached to the face of the end 27 opposite to 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 lateral faces 14,15. The anvil 33 is separated from the other branch of the conductor 25 by an air gap 34 and the metal block is laminated to limit 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 rebound of the fixed contact 29 and amplifies the blow on the fixed contact 29. This blow causes crushing of the surfaces in contact and a reduction in contact resistance, which has no dispersion. The metal block 33 is made of a ferromagnetic material increasing the magnetic field generated by the passage of current in the supply conductor 25, to blow the arc in the direction of the breaking chamber. The air gap 34 avoids any short-circuiting of the half-loop but it is clear that additional insulation can be planned.

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. 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. 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. 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. Les paires de ressorts 22, 23 assurent également la pression de contact en position de fermeture du pôle. 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. 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. 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. 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. 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. 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.Referring more particularly to FIG. 5, it can be seen that the springs of the pairs of springs 22, 23 are arranged symmetrically on either side of the contact bridge 13, surrounding the latter. On the other hand, the two pairs of springs 22, 23 are arranged symmetrically with respect to the imaginary axis 37 of rotation of the contact bridge 13. One 38 of the ends of the springs 22 is anchored to an axis 39 extending parallel to the imaginary axis 37 and bearing in a notch 40 formed on the face of the contact bridge 13, opposite to that carrying the movable contact 32. The other end 41 of the tension springs 22 is anchored to a rod 42 mounted sliding in a notch 43 formed in the bar 20. The tension springs 22 urge the rod 42 towards the bottom of the notches 43 and exert by the axis 39 a torque on the contact bridge 13 tending to pivot the latter in the direction closing. The springs 23 are arranged in the same way, and the same reference numbers assigned an index are used to designate the corresponding parts. The two pairs of springs 22, 23 ensure a floating mounting of the contact bridge 13 in the orifice 21 by allowing rotation of the contact bridge 13 around the imaginary axis 37. Such a floating mounting is described in French patent n ° 2.622.347. The pairs of springs 22, 23 also provide the contact pressure in the closed position of the pole. The pairs of springs 22, 23 are arranged symmetrically with respect to the imaginary axis of rotation 37, so as to exert in any position of the contact bridge 13, a return torque of the contact bridge 13 in the closed position. This torque decreases as the contact bridge 13 moves towards the open position, and the anchor rods 42, 42 ′ are arranged so as to interfere with the pivoting path of the contact bridge 13, in end of opening stroke by repulsion of the contact bridge 13. To this end, the edges of the contact bridge 13 carry or are shaped on the cam surface 44, 44 ′ engaging the rods 42, respectively, at the end of the repulsion travel, 42 ', by sliding them in their notch 43, towards elongation of the springs 22,23. This engagement brakes the movement of the contact bridge 13, and reduces or cancels the impact on the opening end-of-travel stop, 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 can be arranged to keep in any position a restoring torque of the contact bridge towards the closed position, or conversely present a retaining snap of the contact bridge 13, in the repelled position opened. In the first case, the contact bridge 13 closes automatically if the opening of the circuit breaker is not confirmed by the rotation of the bar section 20 controlled by the mechanism, but the return travel of the contact bridge 13 is slowed down. by its braking at the end of the race. This slowing down may be sufficient to ensure trigger selectivities, in this case an opening of a downstream device which eliminates the fault. In the second case of retention of the contact bridge 13 in the repulsion position, this snap-fastening is eliminated during the rotation of the bar section 20, actuated by the mechanism, so as to bring the contact bridge 13 back to the initial position relative to to the bar 20. It is easy to see that the braking and / or retaining system of the contact bridge 13, in the repulsion position does not require any additional part, and is particularly simple and effective.

L'invention est bien entendu nullement limitée au mode de mise en oeuvre plus particulièrement décrit, mais elle englobe tous les modes de réalisation qui ne sortent pas du cadre de l'invention telle que revendiquée.The invention is of course in no way limited to the mode of implementation more particularly described, but it encompasses all the embodiments which do not depart from the scope of the invention as claimed.

Claims (10)

  1. A moulded case low voltage circuit breaker comprising a rotary contact bridge (13), a pair of stationary contacts (11, 12) cooperating with said contact bridge, conductors (24, 25) for current input to said stationary contacts (11, 12) arranged to generate electrodynamic forces repelling the contact bridge(13) to the repelled open position when a short-circuit current flows, a rotary bar (20) having a transverse orifice (21) housing with clearance said contact bridge (13), which protrudes out from both sides of the bar (20), at least one pair of tension springs (22, 23) fitted between the bar (20) and contact bridge (13) to provide a contact pressure of the contact bridge (13) on the stationary contacts (11, 12) in the closed position of the circuit breaker, while allowing rotation of the contact bridge (13) due to the action of said electrodynamic forces to the repelled open position, said springs (22, 23) being arranged symmetrically on each side of the rotation axis (37) of the contact bridge (13), and each presenting one end (38, 38') anchored on the contact bridge (13), characterized in that an opposite end (41, 41') of said springs (22, 23) is anchored on a rod (42, 42') slidingly mounted in a notch (43) of the bar (20) and that said contact bridge (13) presents a pair of cams (44, 44') symmetrical with respect to said axis (37), each being arranged to cooperate at the end of repulsion travel of the contact bridge (13) with one of the rods (42, 42') to slow down the movement of the contact bridge (13).
  2. The circuit breaker according to claim 1, characterized in that said rod (42, 42') is mounted with limited sliding in said notch (43) arranged in the bar (20), said notch extending appreciably in the line of action of the associated spring (22, 23) and that the two notches (43), arranged in the bar, are diametrically opposite.
  3. The circuit breaker according to claim 1 or 2, characterized in that said springs (22, 23) position the contact bridge (13) flexibly in the orifice (21) of the bar (20) defining a fictitious rotation axis (37) of the contact bridge with respect to the bar.
  4. The circuit breaker according to claim 1, 2 or 3, characterized in that the profile of the cam (44, 44') imposes a movement of the rod (42, 42') in the notch (43) and a progressive elongation of the corresponding tension spring (22, 23) in the course of pivoting of the contact bridge (13) to the repelled position with storing of energy in the spring.
  5. The circuit breaker according to any one of the above 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. The circuit breaker according to claim 5, characterized in that the profile of the cam (44, 44') is arranged to generate catching of the contact bridge (13) in the repelled position.
  7. The circuit breaker according to claim 5 or 6, characterized in that the bar (20) is mounted in rotation and is actuated by a circuit breaker opening mechanism and that the opening travel of the contact bridge (13) is limited so that the rotation of the bar releases the rod (42, 42') from the associated cam (44, 44') in the course of the opening movement.
  8. The circuit breaker according to any one of the above claims, characterized in that in the course of pivoting of the contact bridge (13) to the repelled position the line of action of each spring moves reducing the lever arm and thereby the return torque exerted by the spring (22, 23) on the contact bridge.
  9. The circuit breaker according to any one of the above claims, characterized in that said pair of springs (22, 23) is arranged 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 each side of the contact bridge.
  10. The circuit breaker according to claim 9, characterized in that said cam (44, 44') is arranged on the edge of the contact bridge (13) opposite from the contacts to engage the central section of said transverse spindle (42, 42') at the end of repulsion travel.
EP93420100A 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)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9203142 1992-03-13
FR9203142A FR2688626B1 (en) 1992-03-13 1992-03-13 CIRCUIT BREAKER WITH MOLDED BOX WITH BRIDGE OF BRAKE CONTACTS AT THE END OF PULSE STROKE.

Publications (2)

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

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EP93420100A Expired - Lifetime EP0560697B1 (en) 1992-03-13 1993-03-05 Moulded-case circuit breaker with retardation at the end of the contact bridges repulsion movement

Country Status (6)

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

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Also Published As

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DE69304374T2 (en) 1997-02-20
FR2688626B1 (en) 1994-05-06
EP0560697A1 (en) 1993-09-15
DE69304374D1 (en) 1996-10-10
US5310971A (en) 1994-05-10
ES2092792T3 (en) 1996-12-01
JPH0652777A (en) 1994-02-25
JP3352750B2 (en) 2002-12-03
FR2688626A1 (en) 1993-09-17

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