EP0419324A1 - Circuit breaker device with arcing assisting current loops - Google Patents

Circuit breaker device with arcing assisting current loops Download PDF

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Publication number
EP0419324A1
EP0419324A1 EP90402519A EP90402519A EP0419324A1 EP 0419324 A1 EP0419324 A1 EP 0419324A1 EP 90402519 A EP90402519 A EP 90402519A EP 90402519 A EP90402519 A EP 90402519A EP 0419324 A1 EP0419324 A1 EP 0419324A1
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EP
European Patent Office
Prior art keywords
plane
switch device
deflector
loop
fixed 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
EP90402519A
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German (de)
French (fr)
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EP0419324B1 (en
Inventor
Christian Blanchard
Didier Vigouroux
Michel Lauraire
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Telemecanique SA
Original Assignee
La Telemecanique Electrique SA
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Application filed by La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
Publication of EP0419324A1 publication Critical patent/EP0419324A1/en
Application granted granted Critical
Publication of EP0419324B1 publication Critical patent/EP0419324B1/en
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Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • the invention relates to a protective switch device, for a circuit subject to short-circuit currents, in which the natural development of the arc appearing at the opening of a pair of contacts placed in a chamber and occurring moving along a deflecting conductor is assisted and accelerated by a magnetic induction developed by at least one loop conducting these currents which is placed outside the chamber in a plane substantially parallel to that which passes through this deflector and through these contacts.
  • the conductive loop has: - A first end portion adapted to be electrically connected to the fixed contact; - a tongue extending the first portion to constitute the deflector conductor; and - A second end portion which is placed in alignment with the tongue and which is intended to join directly or indirectly a connection terminal of the device receiving the device.
  • These devices which are mainly intended to equip overcurrent protection devices, use the device of an assistance in blowing the arc thanks to an induction which is established on its path in order to accelerate its swelling and to hasten its destabilization. Thanks to this device, we can build limiting devices of reduced size which the need is felt for both industrial and domestic installations where the technical cost becomes one of the main criteria of choice.
  • the invention therefore proposes to provide a switch device as defined above, in which the shape of the current loop can meet the following requirements: simplicity, ease of assembly, reduced overall dimensions and reduced cost Manufacturing.
  • the aim is achieved thanks to the fact that: - The loop is formed by folding a longitudinal portion of a single flat blank cut from a strip; - the longitudinal portion is stretched and arched in its own plane.
  • a switch device 1 in which the invention can be advantageously implemented can be incorporated, see FIG. 1, into an insulating prismatic box 2 inside which there is one (or two) breaking chambers such as 3; we can, for example, imagine a device more complete by establishing symmetry with respect to the axis of movement XX ′ of a movable contact bridge 4.
  • This contact bridge then carries pads 5, 6 cooperating with fixed contact pads 7, 8 and is here subjected to the action of a contact pressure spring 9 which can be compressed or released by the movement of an external pusher 10 acting on a lateral guiding and holding means 11 of the contact bridge.
  • the fixed contact 8 is soldered to an end portion 12 of a conductive copper part 13 having a folded portion 14, an ascending branch 15a, 15, a descending branch 16 and a second end portion 17 which is offset and folded down to receive a connection terminal 18; an extension 19 of the portion 12 constituting a deflector extends in the chamber in the direction of the terminal and joins a region 20 opposite the contacts in which there may be means liable to destabilize an electric arc, such as a narrow slot, fractionation fins, etc.
  • a magnetizable flat part 21 is arranged under the deflector 19.
  • a second conductive deflection piece 22 which would also extend in a symmetrical chamber not shown, allows the current of an arc such as 23 to flow between the terminal 18 and an opposite symmetrical terminal 24 by supplying a second arc 25 symmetrical to the first , the circuit of which passes through a symmetrical deflector 19 ′.
  • the different segments 14, 15, 16, 17 constitute a conductive loop 30 capable of creating, in the area crossed by the arc between the fixed contact and the region 20, an induction direction perpendicular to the figure.
  • a rough metal blank blank 26 having a longitudinal portion 28, 28 a , 28 b , such as that visible in FIG. 6, can advantageously be used to produce a conductive part having a single loop such as that illustrated in FIG. 4, when subjected to deformations in its plane which are intended to reveal the various elements 19, 12, 14, 17; 15, 15 a , 16, 16 a in the appropriate places.
  • a blank 27 of the part, visible in FIG. 7, will be used when the latter must include two loops 30 c , 30 b , such as those visible in FIG. 3, where it can be seen that one can dispense with 'operate the separations - S - and T, which are themselves necessary when using a blank conforming to that of Figure 5.
  • the loops 30 are formed by drawdown, for example at right angles to a plane parallel to the plane PP ′ of the margins (not projecting) of the blank, then drawing / bending of these margins in the drawdown plane.
  • the conductive part which has been illustrated shows, see FIG. 1, the fact that the rising branch or branches 15 a are connected to the portion 12 by a portion 14 being placed at a level lower than that of the plane SS ′ where is located fixed the fixed contact pad 8.
  • This branch 15 is, moreover, placed in such a way that the pair of contacts 5, 8 is located between the branches 15 a and 16.
  • the conductive part With its loop (s) and its contact and terminal regions, represents an inseparable whole, it is not possible to incorporate it directly into a casing of any shape since a part will be inside and another part outside of it.
  • FIGS. 11 to 13 it is therefore necessarily necessary to define a housing 50 capable of allowing the implementation of this conductive assistance part, in particular when the latter has two loops.
  • This which is shown in Figures 11, 12, 13 to which reference will be made, in order to illustrate a housing with two symmetrical breaking chambers, uses two insulating shells 52, 53 substantially symmetrical with respect to a joint plane median WW ′ where, after mounting, the median plane PP ′ of the conductive part will be located and to a base 54 intended mainly to locally seal the cavity which is between the two shells in order to constitute the two symmetrical breaking chambers of a switch having a contact bridge.
  • This base mainly comprises an axial guide channel 55 intended to receive a mobile contact bridge support such as that designated at 10 in FIG. 1 and a certain number of clearances 56, 57 and 58, 59 which are intended to receive the portions end such as 14 and 17 in order to immobilize them.
  • This first installation of the conductive part can here be done by exploiting if necessary the elasticity of the latter parallel to the plane PP ′.
  • the clearances such as 58, 59 which are made in a central rib 60 of the base having a width less than that of the external face 61, extend to this face while leaving on either side of the median plane two parallel arms 62, 63 contributing to the maintenance of a terminal such as 18.
  • the shells 52, 53 each have on an internal wall of the chamber such as 64, on the one hand, clearances or grooves 65, 66 and 67 for securing the opposite edges of the individual deflectors such as 19 and respectively those of the common deflector such that 22 and, on the other hand, a boss such as 68 serving to receive the end of the return spring of the contact bridge such as 9.
  • an external wall 69 opposite to the wall 64 of a shell there are open corridors or footprints of shallow depth such as 71, 72 which are shaped to receive the external parts of the loops such as 30 c , 30 b and which circulate by following between a region 73 adjacent to the portion 14, and a region 74 adjacent to the portion 17 of the conductive part.
  • Lateral clearances such as 75 and 76, which are located opposite clearances such as 56, 57, allow passage of the ends of the external ascending branches of the loops, up to the internal volume of the cavity present between the shells.
  • the shells of the set-up is done in direction F simultaneously discarding the loops 30a, 30b of the conductive member and thereafter folding them in the corridors 71, 72; the latter, which do not have a depth much greater than the thickness of the current loops, can simultaneously maintain the various elements constituting the housing or contribute to it.

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  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

A conductor system (30), comprising one or two current loops (30c), respectively (30b), extending on either side of a plane of symmetry (PP') passing through an arc deflector (19) and through a fixed contact (5), is obtained by plastic deformation and bending of a flat part cut out from a metal sheet of conducting material in such a way that the material scrap is much reduced. <IMAGE>

Description

L'invention se rapporte à un dispositif interrupteur de protection, pour un circuit sujet à des courants de court-­circuit, dans lequel le développement naturel de l'arc appa­raissant à l'ouverture d'une paire de contacts placés dans une chambre et se déplaçant le long d'un conducteur déflec­teur est assisté et accéléré par une induction magnétique développée par au moins une boucle conductrice de ces cou­rants qui est placée extérieurement à la chambre dans un plan sensiblement parallèle à celui qui passe par ce déflec­teur et par ces contacts.The invention relates to a protective switch device, for a circuit subject to short-circuit currents, in which the natural development of the arc appearing at the opening of a pair of contacts placed in a chamber and occurring moving along a deflecting conductor is assisted and accelerated by a magnetic induction developed by at least one loop conducting these currents which is placed outside the chamber in a plane substantially parallel to that which passes through this deflector and through these contacts.

Elle concerne plus particulièrement un dispositif interrup­teur de protection, d'un type similaire à celui décrit dans le brevet EP-231 600, dans lequel la boucle conductrice présente :
- une première portion d'extrémité propre à être électrique­ment reliée au contact fixe ;
- une languette prolongeant la première portion pour consti­tuer le conducteur déflecteur ; et
- une seconde portion d'extrémité qui est placée dans l'ali­gnement de la languette et qui est destinée à rejoindre directement ou indirectement une borne de raccordement de l'appareil recevant le dispositif.It relates more particularly to a protective switch device, of a type similar to that described in patent EP-231,600, in which the conductive loop has:
- A first end portion adapted to be electrically connected to the fixed contact;
- a tongue extending the first portion to constitute the deflector conductor; and
- A second end portion which is placed in alignment with the tongue and which is intended to join directly or indirectly a connection terminal of the device receiving the device.

Ces dispositifs, qui sont principalement destinés à équiper des appareils de protection contre les surintensités, utili­sent l'artifice d'une assistance au soufflage de l'arc grâce à une induction qui est établie sur son trajet en vue d'accélérer son gonflement et hâter sa déstabilisation. Grâce à cet artifice, on peut construire des appareils limi­teurs de taille réduite dont le besoin se fait ressentir tant pour les installations industrielles que domestiques où le coût technique devient l'un des principaux critères de choix.These devices, which are mainly intended to equip overcurrent protection devices, use the device of an assistance in blowing the arc thanks to an induction which is established on its path in order to accelerate its swelling and to hasten its destabilization. Thanks to this device, we can build limiting devices of reduced size which the need is felt for both industrial and domestic installations where the technical cost becomes one of the main criteria of choice.

La construction des boucles de courant est une opération relativement dispendieuse dans la mesure où elle requiert, soit l'assemblage de plusieurs éléments, soit le découpage et le pliage de pièces conductrices découpées, dont le déve­loppement dans le plan de la feuille métallique d'où elles sont tirées utilise mal la surface disponible ; cette tech­nique de découpage est toutefois intéressante en raison de la simplification qu'elle apporte au montage d'appareils fabriqués en très grandes quantités, en dispensant le constructeur d'opérations ultérieures de soudage et/ou d'assemblage.The construction of current loops is a relatively expensive operation insofar as it requires either the assembly of several elements, or the cutting and bending of cut conductive parts, the development of which in the plane of the metal foil they are drawn badly uses the available surface; this cutting technique is however interesting because of the simplification it brings to the assembly of devices manufactured in very large quantities, by exempting the manufacturer from subsequent welding and / or assembly operations.

L'invention se propose, par suite, de fournir un dispositif interrupteur tel que défini ci-dessus, dans lequel la conformation de la boucle de courant pourra répondre aux impératifs suivants : simplicité, facilité d'assemblage, encombrement réduit en largeur et coût réduit de fabrica­tion.The invention therefore proposes to provide a switch device as defined above, in which the shape of the current loop can meet the following requirements: simplicity, ease of assembly, reduced overall dimensions and reduced cost Manufacturing.

Selon l'invention, le but visé est atteint grâce au fait que :
- la boucle est formée par pliage d'une portion longitudina­le d'une unique ébauche plate découpée dans un feuillard ;
- la portion longitudinale est étirée et cambrée dans son plan propre.According to the invention, the aim is achieved thanks to the fact that:
- The loop is formed by folding a longitudinal portion of a single flat blank cut from a strip;
- the longitudinal portion is stretched and arched in its own plane.

D'autres mesures, qui prennent en compte, d'une part, l'efficacité d'une boucle dont la surface couverte et, par suite, la longueur, doivent répondre à certains critères et, d'autre part, la nécessité de ne pas communiquer au matériau utilisé des contraintes de déformation excessives, peuvent amener à définir des proportions intéressantes.Other measures, which take into account, on the one hand, the efficiency of a loop whose covered area and, consequently, the length, must meet certain criteria and, on the other hand, the need to not not communicate excessive strain constraints to the material used, can lead to defining interesting proportions.

Enfin, des dispositions particulières qui visent, elles, l'obtention d'intéressantes caractéristiques de limitation en augmentant l'efficacité de la boucle, seront également précisées ci-dessous.Finally, specific provisions which aim to obtain interesting limiting characteristics by increasing the efficiency of the loop, will also be specified below.

L'invention, ainsi qu'un mode de réalisation préféré et une variante, seront mieux compris à la lecture de la descrip­tion ci-dessous et à l'examen des figures annexées qui l'accompagnent en illustrant respectivement :

  • A la figure 1, une vue en élévation du dispositif coupé par un plan moyen passant par l'axe de déplace­ment d'une pièce mobile d'interrupteur, et par une borne associée ;
  • A la figure 2, une vue de dessus du dispositif selon la figure 1 ;
  • A la figure 3, une vue en perspective d'une pièce d'assistance magnétique comportant deux boucles de courant ;
  • A la figure 4, une vue d'une ébauche qui devrait être utilisée si l'on ne mettait en oeuvre que le pliage pour obtenir une pièce d'assistance n'ayant qu'une boucle de courant ;
  • A la figure 5, une vue d'une ébauche qui devrait être utilisée si l'on ne mettait en oeuvre que le pliage pour obtenir une pièce d'assistance ayant deux boucles de courant ;
  • Aux figures 6 et 7, des vues des ébauches mises en oeuvre dans l'invention ;
  • A la figure 8, une vue en perspective d'une variante de pièce d'assistance magnétique à deux boucles de courant ;
  • A la figure 9, une vue de l'ébauche correspondant à la pièce selon la figure 8 ;
  • A la figure 10, une vue simplifiée d'une pièce d'assistance magnétique pour un dispositif interrup­teur à simple coupure ;
  • A la figure 11, une vue en élévation d'un boîtier destiné à recevoir la pièce conductrice portant les boucles ;
  • A la figure 12, une vue en élévation d'une face inter­ne d'une des coquilles du boîtier ; et
  • A la figure 13, une vue en perspective éclatée des deux coquilles et de l'embase servant à former le boîtier isolant.
The invention, as well as a preferred embodiment and a variant, will be better understood on reading the description below and on examining the appended figures which accompany it, illustrating respectively:
  • In Figure 1, an elevational view of the device cut by a mean plane passing through the axis of movement of a movable switch part, and by an associated terminal;
  • In Figure 2, a top view of the device according to Figure 1;
  • In FIG. 3, a perspective view of a magnetic assistance piece comprising two current loops;
  • In Figure 4, a view of a blank which should be used if only folding was used to obtain an assistance part having only a current loop;
  • In FIG. 5, a view of a blank which should be used if only folding was used to obtain an assistance piece having two current loops;
  • In Figures 6 and 7, views of the blanks used in the invention;
  • In FIG. 8, a perspective view of a variant of a magnetic assistance piece with two current loops;
  • In FIG. 9, a view of the blank corresponding to the part according to FIG. 8;
  • In FIG. 10, a simplified view of a magnetic assistance part for a single-break switch device;
  • In Figure 11, an elevational view of a housing for receiving the conductive part carrying the loops;
  • In Figure 12, an elevational view of an internal face of one of the shells of the housing; and
  • In FIG. 13, an exploded perspective view of the two shells and of the base serving to form the insulating housing.

Un dispositif interrupteur 1 dans lequel on peut mettre avantageusement en oeuvre l'invention, peut être incorporé, voir la figure 1, à un boîtier prismatique isolant 2 à l'in­térieur duquel se trouve une (ou deux) chambres de coupure telles que 3 ; on peut, par exemple, imaginer un dispositif plus complet en établissant une symétrie par rapport à l'axe de déplacement XX′ d'un pont de contact mobile 4.A switch device 1 in which the invention can be advantageously implemented, can be incorporated, see FIG. 1, into an insulating prismatic box 2 inside which there is one (or two) breaking chambers such as 3; we can, for example, imagine a device more complete by establishing symmetry with respect to the axis of movement XX ′ of a movable contact bridge 4.

Ce pont de contact porte alors des pastilles 5, 6 coopérant avec des pastilles de contacts fixes 7, 8 et se trouve ici soumis à l'action d'un ressort de pression de contact 9 qui peut être comprimé ou relâché par le déplacement d'un pous­soir extérieur 10 agissant sur un moyen de guidage et de maintien latéral 11 du pont de contact.This contact bridge then carries pads 5, 6 cooperating with fixed contact pads 7, 8 and is here subjected to the action of a contact pressure spring 9 which can be compressed or released by the movement of an external pusher 10 acting on a lateral guiding and holding means 11 of the contact bridge.

Le contact fixe 8 est brasé sur une portion d'extrémité 12 d'une pièce conductrice en cuivre 13 ayant une portion rabattue 14, une branche ascendante 15a, 15, une branche descendante 16 et une seconde portion d'extrémité 17 qui est déportée et rabattue pour recevoir une borne de raccordement 18 ; un prolongement 19 de la portion 12 constituant un déflecteur s'étend dans la chambre en direction de la borne et rejoint une région 20 opposée aux contacts dans laquelle peuvent se trouver des moyens susceptibles de déstabiliser un arc électrique, tels qu'une fente étroite, des ailettes de fractionnement, etc...The fixed contact 8 is soldered to an end portion 12 of a conductive copper part 13 having a folded portion 14, an ascending branch 15a, 15, a descending branch 16 and a second end portion 17 which is offset and folded down to receive a connection terminal 18; an extension 19 of the portion 12 constituting a deflector extends in the chamber in the direction of the terminal and joins a region 20 opposite the contacts in which there may be means liable to destabilize an electric arc, such as a narrow slot, fractionation fins, etc.

Avantageusement, une pièce plate magnétisable 21 est dispo­sée sous le déflecteur 19.Advantageously, a magnetizable flat part 21 is arranged under the deflector 19.

Une seconde pièce conductrice de déflexion 22 qui s'éten­drait également dans une chambre symétrique non représentée, permet au courant d'un arc tel que 23 de circuler entre la borne 18 et une borne symétrique opposée 24 en alimentant un second arc 25 symétrique du premier, dont le circuit passe par un déflecteur symétrique 19′.A second conductive deflection piece 22 which would also extend in a symmetrical chamber not shown, allows the current of an arc such as 23 to flow between the terminal 18 and an opposite symmetrical terminal 24 by supplying a second arc 25 symmetrical to the first , the circuit of which passes through a symmetrical deflector 19 ′.

Lorsqu'un courant J circule de la borne 18 à la borne 24 en traversant les conducteurs 17, 16, 15, 14, 12, 19, l'arc 23, le second déflecteur 22 et les éléments symétriques corres­pondants, les différents segments 14, 15, 16, 17 constituent une boucle conductrice 30 susceptible de créer, dans la zone traversée par l'arc entre le contact fixe et la région 20, une induction de direction perpendiculaire à la figure.When a current J flows from terminal 18 to terminal 24 passing through the conductors 17, 16, 15, 14, 12, 19, the arc 23, the second deflector 22 and the corresponding symmetrical elements, the different segments 14, 15, 16, 17 constitute a conductive loop 30 capable of creating, in the area crossed by the arc between the fixed contact and the region 20, an induction direction perpendicular to the figure.

L'interaction de cette induction et du courant J passant dans l'arc 23 communique à celui-ci des forces de Laplace provoquant un déplacement vers la droite de la figure plus rapide que ne le serait le gonflement naturel, ainsi qu'un allongement de sa colonne imputable aux trajets divergents des déflecteurs ; l'arc 23 se trouve de son côté déplacé vers la droite.The interaction of this induction and the current J passing in the arc 23 communicates to it Laplace forces causing a displacement to the right of the figure faster than would be the natural swelling, as well as an elongation of its column attributable to the divergent paths of the deflectors; the arc 23 is on its side moved to the right.

Ces déformations et mouvements de l'arc développent, dans celui-ci, une tension élevée qui est nécessaire à l'obten­tion d'une rapide décroissance des courants de court-circuit tels que J.These deformations and movements of the arc develop in it a high voltage which is necessary for obtaining a rapid decrease in short-circuit currents such as J.

Ainsi qu'on le voit à la figure 3, on peut relier entre la borne et le premier déflecteur deux boucles 30a, 30b paral­lèles au plan médian PP′ du dispositif interrupteur passant par l'axe XX′, la pastille 5 et la borne 18.As seen in Figure 3, we can connect between the terminal and the first deflector two loops 30 a , 30 b parallel to the median plane PP ′ of the switch device passing through the axis XX ′, the pad 5 and the terminal 18.

Ainsi qu'on le voit à la figure 4, le développement dans un plan d'une pièce conductrice 30a découpée et pliée ne comportant qu'une seule boucle de courant telle que 30, conduirait à une très mauvaise utilisation d'une bande de métal. Une situation analogue se présenterait naturellement si une telle pièce comportait deux boucles de courant 30c, 30b, voir figure 5, dont le développement, dans le plan d'une bande de métal, ne pourrait se faire qu'en opérant une séparation - S - T - par exemple au niveau de demi-portions 17a, 17b.As seen in Figure 4, the development in a plane of a conductive member 30 is cut and bent with only one current loop such as 30, would lead to a very poor use of a band of metal. A similar situation would naturally arise if such a part had two current loops 30 c , 30 b , see FIG. 5, the development of which, in the plane of a metal strip, could only be achieved by making a separation - S - T - for example at the level of half-portions 17 a , 17 b .

Une ébauche métallique brute de découpage 26 ayant une portion longitudinale 28, 28a, 28b, telle que celle visible à la figure 6, peut avantageusement être utilisée pour réaliser une pièce conductrice ayant une seule boucle telle que celle illustrée à la figure 4, lorsqu'on la soumet à des déformations dans son plan qui sont destinées à faire appa­raître les différents éléments 19, 12, 14, 17 ; 15, 15a, 16, 16a aux endroits appropriés.A rough metal blank blank 26 having a longitudinal portion 28, 28 a , 28 b , such as that visible in FIG. 6, can advantageously be used to produce a conductive part having a single loop such as that illustrated in FIG. 4, when subjected to deformations in its plane which are intended to reveal the various elements 19, 12, 14, 17; 15, 15 a , 16, 16 a in the appropriate places.

Ces déformations comprennent des cambrures et/ou des élonga­tions locales du métal dans le plan, ainsi que des pliages qui doivent apparaître dans les angles, comme cela apparaît dans les zones hachurées, respectivement pointillées sur la figure 6. On peut apprécier à l'examen des figures 4 et 6 l'économie de matière ainsi réalisée.These deformations include camber and / or local elongations of the metal in the plane, as well as bends which must appear in the corners, as appears in the hatched areas, respectively dotted in FIG. 6. It can be seen on examination Figures 4 and 6 the material saving thus achieved.

Une ébauche 27 de pièce, visible à la figure 7, sera utili­sée lorsque celle-ci devra comporter deux boucles 30c, 30b, telles que celles visibles à la figure 3, où l'on constate que l'on peut se dispenser d'opérer les séparations - S - et T, qui sont, elles, nécessaires lorsque l'on utilise une ébauche conforme à celle de la figure 5. Dans ce cas, d'une façon analogue à la précédente, les boucles 30 sont formées par rabattement, par exemple à angle droit vers un plan parallèle au plan P-P′ des marges (non débordantes) de l'ébauche, puis étirage/cambrage de ces marges dans le plan de rabattement.A blank 27 of the part, visible in FIG. 7, will be used when the latter must include two loops 30 c , 30 b , such as those visible in FIG. 3, where it can be seen that one can dispense with 'operate the separations - S - and T, which are themselves necessary when using a blank conforming to that of Figure 5. In this case, in a similar manner to the previous, the loops 30 are formed by drawdown, for example at right angles to a plane parallel to the plane PP ′ of the margins (not projecting) of the blank, then drawing / bending of these margins in the drawdown plane.

La pièce conductrice qui a été illustrée fait apparaître, voir figure 1, le fait que la ou les branches montantes 15a sont raccordées à la portion 12 par une portion 14 se trouvant placée à un niveau inférieur à celui du plan SS′ où se trouve fixée la pastille de contact fixe 8. Cette branche 15 est, par ailleurs, placée de façon telle que le couple de contacts 5, 8 soit situé entre les branches 15a et 16. Ces mesures, qui améliorent localement la répartition de l'induction en vue de favoriser le déplacement initial de l'arc, sont particulièrement aisées à mettre en oeuvre dans le cadre d'une boucle formée par les opérations précédentes.The conductive part which has been illustrated shows, see FIG. 1, the fact that the rising branch or branches 15 a are connected to the portion 12 by a portion 14 being placed at a level lower than that of the plane SS ′ where is located fixed the fixed contact pad 8. This branch 15 is, moreover, placed in such a way that the pair of contacts 5, 8 is located between the branches 15 a and 16. These measures, which locally improve the distribution of the induction in order to promote the initial displacement of the arc, are particularly easy to implement in the context of a loop formed by the previous operations.

On pourrait toutefois appliquer l'invention par exemple à une pièce 33 à deux boucles 38a, 38b illustrée à la figure 8 où, ni la portion rabattue 14 antérieure, ni la portion 17 antérieure n'apparaissent et où deux traverses 31, 32 sont respectivement prévues pour supporter le contact fixe 34 et être respectivement associées à la borne 35 ; une ébauche correspondante 39 est représentée à la figure 9. On constate que, contrairement au mode de réalisation précédent, les racines des branches montantes 38c, 38d prennent naissance dans le plan Q contenant la pastille de contact 34.One could however apply the invention for example to a part 33 with two loops 38 a , 38 b illustrated in FIG. 8 where neither the front folded portion 14 nor the front portion 17 appear and where two cross members 31, 32 are respectively provided to support the fixed contact 34 and be respectively associated with the terminal 35; a corresponding blank 39 is shown in FIG. 9. It can be seen that, unlike the previous embodiment, the roots of the rising branches 38 c , 38 d originate in the plane Q containing the contact pad 34.

Dans l'appareil interrupteur qui a été décrit, l'arc se déplace en gardant ses pieds sur deux déflecteurs 19, 19′ opposés qui peuvent être mis en place de part et d'autre d'un pont de contact 4 à double coupure.In the switch device which has been described, the arc moves, keeping its feet on two opposite deflectors 19, 19 ′ which can be put in place on either side of a contact bridge 4 with double break.

Si l'on se propose d'associer à un dispositif interrupteur à simple coupure 40 placé entre deux bornes 44, 45, une ou plusieurs boucles de courant conformes à l'invention, voir figure 10, on sera amené à prévoir sur l'extrémité d'un levier de contact mobile 41 une corne telle que 42, afin que l'un des deux pieds d'arc puisse s'accrocher sur une surface conductrice distincte de celle de la pastille mobile 43, une tresse conductrice 48 servant à fermer le circuit.If it is proposed to associate with a single-break switch device 40 placed between two terminals 44, 45, one or more current loops in accordance with the invention, see FIG. 10, we will have to provide on the end of a movable contact lever 41 a horn such as 42, so that one of the two arc feet can hang on a conductive surface distinct from that of the movable pad 43, a conductive braid 48 serving to close the circuit.

Compte tenu du chemin curviligne que suit alors cette corne, il est indispensable de conférer à la ou aux boucles de courant 46, 47 une forme adaptée, qui permette de mettre en oeuvre des opérations de déformation mécanique telles que celles mentionnées ci-dessus.Given the curvilinear path that this horn then follows, it is essential to give the current loop (s) 46, 47 a suitable shape, which makes it possible to carry out mechanical deformation operations such as those mentioned above.

Pour des dispositifs interrupteurs à simple et double coupu­re destinés à des appareils ayant des calibres nominaux de 16 A à 63 A, on peut définir un rapport K d'environ 1,5 à 4 entre la longueur développée - B - de la boucle (par exem­ple, portions 15a, 15 et 16a, 16 de la figure 3 et la distan­ce - D - mesurant la longueur du déflecteur 19).For single and double cut-off switchgear intended for devices with nominal ratings from 16 A to 63 A, it is possible to define a ratio K of approximately 1.5 to 4 between the developed length - B - of the loop (by example, portions 15 a , 15 and 16 a , 16 of FIG. 3 and the distance - D - measuring the length of the deflector 19).

Ces valeurs, qui sont avantageuses pour procurer aux boucles une bonne efficacité d'assistance au développement de l'arc, sans exposer le métal tel que le cuivre à des contraintes exagérées, ne sont naturellement pas limitatives, compte tenu des applications particulières qui pourraient être envisagées et de l'épaisseur que pourrait présenter la bande d'où sont tirées les ébauches.These values, which are advantageous for providing the loops with a good efficiency in assisting the development of the arc, without exposing the metal such as copper to exaggerated stresses, are naturally not limiting, taking into account the particular applications which could be envisaged and the thickness that the strip from which the blanks could be drawn could have.

Il est, par ailleurs, clair que les portions 17, respective­ment 32 qui ont été jusqu'ici directement associées à des bornes 18, respectivement 35, pourraient être indirectement raccordées à l'aide de conducteurs de prolongation si les bornes se trouvaient plus éloignées dans un appareil parti­culier.It is, moreover, clear that the portions 17, respectively 32 which have hitherto been directly associated with terminals 18, respectively 35, could be indirectly connected with the aid of extension conductors if the terminals were further apart in a particular device.

Compte tenu du fait que la pièce conductrice, avec sa ou ses boucles et ses régions de contact et de borne, représente un tout indissociable, il n'est pas possible d'incorporer directement celle-ci dans un boîtier de forme quelconque vu qu'une partie se trouvera à l'intérieur et une autre partie à l'extérieur de celui-ci.In view of the fact that the conductive part, with its loop (s) and its contact and terminal regions, represents an inseparable whole, it is not possible to incorporate it directly into a casing of any shape since a part will be inside and another part outside of it.

Dans le cadre de l'invention qui vise un appareil interrup­teur, voir figures 11 à 13, on est donc nécessairement amené à définir un boîtier 50 susceptible de permettre la mise en oeuvre de cette pièce conductrice d'assistance, en particu­lier lorsque celle-ci possède deux boucles. Celui-ci, qui est représenté aux figures 11, 12, 13 auxquelles on se reportera, afin d'illustrer un boîtier à deux chambres de coupure symétriques, fait appel à deux coquilles isolantes 52, 53 sensiblement symétriques par rapport à un plan de joint médian WW′ où se situera après montage le plan médian PP′ de la pièce conductrice et à un socle 54 destiné princi­palement à obturer localement la cavité qui est comprise entre les deux coquilles afin de constituer les deux cham­bres de coupure symétrique d'un interrupteur ayant un pont de contact.In the context of the invention which relates to a switching device, see FIGS. 11 to 13, it is therefore necessarily necessary to define a housing 50 capable of allowing the implementation of this conductive assistance part, in particular when the latter has two loops. This, which is shown in Figures 11, 12, 13 to which reference will be made, in order to illustrate a housing with two symmetrical breaking chambers, uses two insulating shells 52, 53 substantially symmetrical with respect to a joint plane median WW ′ where, after mounting, the median plane PP ′ of the conductive part will be located and to a base 54 intended mainly to locally seal the cavity which is between the two shells in order to constitute the two symmetrical breaking chambers of a switch having a contact bridge.

Cette embase comporte principalement un canal de guidage axial 55 destiné à recevoir un support de pont de contact mobile tel que celui désigné en 10 à la figure 1 et un certain nombre de dégagements 56, 57 et 58, 59 qui sont destinés à recevoir les portions d'extrémité telles que 14 et 17 afin d'effectuer une immobilisation de celles-ci.This base mainly comprises an axial guide channel 55 intended to receive a mobile contact bridge support such as that designated at 10 in FIG. 1 and a certain number of clearances 56, 57 and 58, 59 which are intended to receive the portions end such as 14 and 17 in order to immobilize them.

Cette première mise en place de la pièce conductrice peut ici se faire en exploitant au besoin l'élasticité de cette dernière parallèlement au plan PP′. Les dégagements tels que 58, 59 qui sont pratiqués dans une nervure centrale 60 du socle ayant une largeur moindre que celle de la face externe 61, s'étendent jusqu'à cette face en laissant subsister de part et d'autre du plan médian deux bras parallèles 62, 63 concourant au maintien d'une borne telle que 18.This first installation of the conductive part can here be done by exploiting if necessary the elasticity of the latter parallel to the plane PP ′. The clearances such as 58, 59 which are made in a central rib 60 of the base having a width less than that of the external face 61, extend to this face while leaving on either side of the median plane two parallel arms 62, 63 contributing to the maintenance of a terminal such as 18.

Les coquilles 52, 53 possèdent chacune sur une paroi interne de la chambre telle que 64, d'une part, des dégagements ou rainures 65, 66 et 67 pour assujettir les bords opposés des déflecteurs individuels tels que 19 et respectivement ceux du déflecteur commun tel que 22 et, d'autre part, un bossage tel que 68 servant à recevoir l'extrémité du ressort de rappel du pont de contact tel que 9.The shells 52, 53 each have on an internal wall of the chamber such as 64, on the one hand, clearances or grooves 65, 66 and 67 for securing the opposite edges of the individual deflectors such as 19 and respectively those of the common deflector such that 22 and, on the other hand, a boss such as 68 serving to receive the end of the return spring of the contact bridge such as 9.

Sur une paroi externe 69 opposée à la paroi 64 d'une coquil­le se trouvent des couloirs ouverts ou empreintes de faible profondeur tels que 71, 72 qui sont conformés pour recevoir les parties externes des boucles telles que 30c, 30b et qui circulent par suite entre une région 73 voisine de la portion 14, et une région 74 voisine de la portion 17 de la pièce conductrice. Des dégagements latéraux tels que 75 et 76, qui sont situés en regard des dégagements tels que 56, 57, autorisent le passage des extrémités des branches ascen­dantes externes des boucles, jusqu'au volume interne de la cavité présente entre les coquilles.On an external wall 69 opposite to the wall 64 of a shell there are open corridors or footprints of shallow depth such as 71, 72 which are shaped to receive the external parts of the loops such as 30 c , 30 b and which circulate by following between a region 73 adjacent to the portion 14, and a region 74 adjacent to the portion 17 of the conductive part. Lateral clearances such as 75 and 76, which are located opposite clearances such as 56, 57, allow passage of the ends of the external ascending branches of the loops, up to the internal volume of the cavity present between the shells.

La mise en place des coquilles se fait simultanément en sens F en écartant les boucles 30a, 30b de la pièce conductrice et en rabattant ensuite celles-ci dans les couloirs 71, 72 ; ces derniers, qui ne présentent pas une profondeur très supérieure à l'épaisseur des boucles de courant, peuvent assurer simultanément le maintien des différents éléments constituant le boîtier ou concourir à celui-ci.The shells of the set-up is done in direction F simultaneously discarding the loops 30a, 30b of the conductive member and thereafter folding them in the corridors 71, 72; the latter, which do not have a depth much greater than the thickness of the current loops, can simultaneously maintain the various elements constituting the housing or contribute to it.

Claims (6)

1. Dispositif interrupteur de protection, pour un circuit sujet à des courants de court-circuit, dans lequel le développement naturel de l'arc apparaissant à l'ouverture entre un contact mobile et un contact fixe placés dans une chambre et se déplaçant le long d'un conducteur déflecteur est assisté et accéléré par une induction magnétique déve­loppée par au moins une boucle conductrice de ces courants qui est placée extérieurement à la chambre dans un plan sensiblement parallèle à celui qui passe par ce déflecteur et par ces contacts, la boucle présentant :
- une première portion d'extrémité propre à être électrique­ment reliée au contact fixe ;
- une languette prolongeant la première portion pour consti­tuer le conducteur déflecteur ; et
- une seconde portion d'extrémité qui est placée dans l'ali­gnement de la languette et qui est destinée à rejoindre directement ou indirectement une borne de raccordement de l'appareil recevant le dispositif,
caractérisé en ce que :
- la boucle (30) est formée par pliage d'une portion longi­tudinale (28, 28a, 28b) d'une unique ébauche plate (26, 27) découpée dans un feuillard ;
- la portion longitudinale est étirée et cambrée dans son plan propre.1. Protection switch device, for a circuit subject to short-circuit currents, in which the natural development of the arc appearing at the opening between a movable contact and a fixed contact placed in a chamber and moving along of a deflector conductor is assisted and accelerated by a magnetic induction developed by at least one loop conducting these currents which is placed outside the chamber in a plane substantially parallel to that which passes through this deflector and through these contacts, the loop having :
- A first end portion adapted to be electrically connected to the fixed contact;
- a tongue extending the first portion to constitute the deflector conductor; and
a second end portion which is placed in alignment with the tongue and which is intended to directly or indirectly join a connection terminal of the device receiving the device,
characterized in that:
- The loop (30) is formed by folding a longitudinal portion (28, 28 a , 28 b ) of a single flat blank (26, 27) cut from a strip;
- the longitudinal portion is stretched and arched in its own plane. 2. Dispositif interrupteur selon la revendication 1,
caractérisé en ce que deux boucles de courant (30c, 30b) circulent entre les portions d'extrémité (14, 17) de part et d'autre d'un plan moyen (PP′) passant par les contacts (8, 7) et par le déflecteur (19).2. Switch device according to claim 1,
characterized in that two current loops (30 c , 30 b ) circulate between the end portions (14, 17) on either side of a mean plane (PP ′) passing through the contacts (8, 7 ) and by the deflector (19). 3. Dispositif interrupteur selon l'une des revendica­tions 1 ou 2,
caractérisé en ce qu'une racine (15a) d'une branche montante (15) de la boucle de courant (30) se développe à partir de la première portion (14, 12) dans une direction sensiblement parallèle à celle (XX′) du déplacement du contact mobile (4) et circule sensiblement dans un demi-plan (V, V′) ne conte­nant ni les contacts (5, 6, 7, 8) ni le déflecteur (19).3. Switch device according to one of claims 1 or 2,
characterized in that a root (15 a ) of a rising branch (15) of the current loop (30) develops from the first portion (14, 12) in a direction substantially parallel to that (XX ′ ) displacement of the movable contact (4) and circulates substantially in a half-plane (V, V ′) containing neither the contacts (5, 6, 7, 8) nor the deflector (19). 4. Dispositif interrupteur selon la revendication 3,
caractérisé en ce que cette racine (15a) est rattachée à la première portion (12) recevant le contact fixe (5) par une patte cambrée (14) placée du côté opposé à ce contact par rapport au contact mobile (5).4. Switch device according to claim 3,
characterized in that this root (15 a ) is attached to the first portion (12) receiving the fixed contact (5) by an arched tab (14) placed on the side opposite this contact relative to the movable contact (5). 5. Dispositif interrupteur selon la revendication 3,
caractérisé en ce que cette racine (38c, 38d) prend naissan­ce dans le plan (Q) d'une première portion (31).5. Switch device according to claim 3,
characterized in that this root (38 c , 38 d ) originates in the plane (Q) of a first portion (31). 6. Dispositif interrupteur selon l'une des revendica­tions 1 à 5,
caractérisé en ce que la ou les boucles de courant (30,30c, 30b) sont disposées dans des dégagements latéraux (71, 72) opposés d'un boîtier (50) formé par l'association de deux coquilles (52, 53) associées le long d'un plan de joint (WW′) sensiblement parallèle à ces boucles et passant par le contact fixe (8) avec une embase (54), et sont maintenues dans des encoches (75, 76) respectivement rebords de dégage­ments (58, 59) recevant les portions d'extrémité (12, 14), respectivement (17).6. Switch device according to one of claims 1 to 5,
characterized in that the current loop (s) (30.30 c , 30 b ) are arranged in lateral recesses (71, 72) opposite from a housing (50) formed by the association of two shells (52, 53 ) associated along a joint plane (WW ′) substantially parallel to these loops and passing through the fixed contact (8) with a base (54), and are held in notches (75, 76) respectively with clearance edges (58, 59) receiving the end portions (12, 14), respectively (17).
EP90402519A 1989-09-19 1990-09-13 Circuit breaker device with arcing assisting current loops Expired - Lifetime EP0419324B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8912286 1989-09-19
FR8912286A FR2652199B1 (en) 1989-09-19 1989-09-19 SWITCHING DEVICE WITH CURRENT LOOPS ASSISTING THE DEVELOPMENT OF THE ARC.

Publications (2)

Publication Number Publication Date
EP0419324A1 true EP0419324A1 (en) 1991-03-27
EP0419324B1 EP0419324B1 (en) 1995-03-22

Family

ID=9385646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90402519A Expired - Lifetime EP0419324B1 (en) 1989-09-19 1990-09-13 Circuit breaker device with arcing assisting current loops

Country Status (5)

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US (1) US5142111A (en)
EP (1) EP0419324B1 (en)
JP (1) JPH03133015A (en)
DE (1) DE69017992T2 (en)
FR (1) FR2652199B1 (en)

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EP0492456A2 (en) * 1990-12-28 1992-07-01 Mitsubishi Denki Kabushiki Kaisha Switch
WO1995022166A1 (en) * 1994-02-14 1995-08-17 Square D Company Blow-off terminal for a circuit breaker
US6518530B2 (en) 1999-11-25 2003-02-11 Moeller Gmbh Current-limiting contact arrangement

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FR2714520B1 (en) * 1993-12-24 1996-01-19 Telemecanique Electric switch device with separable contacts.
US5417286A (en) * 1993-12-29 1995-05-23 Amoco Corporation Method for enhancing the recovery of methane from a solid carbonaceous subterranean formation
KR100282641B1 (en) * 1998-12-28 2001-02-15 윤문수 Breaker extinguisher fixed contactor
DE10058419C1 (en) * 2000-11-24 2002-06-06 Moeller Gmbh Current-limiting switch has conductor loop provided with switching current providing electrodynamic forces assisting opening movement of contact device upon overload detection
ATE407441T1 (en) * 2004-07-08 2008-09-15 Abb Schweiz Ag ARC EXTINGUISHING DEVICE FOR CIRCUIT BREAKERS
DE102012112202A1 (en) * 2012-12-13 2014-06-18 Eaton Electrical Ip Gmbh & Co. Kg Polarity-independent switching device for conducting and separating direct currents

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Also Published As

Publication number Publication date
DE69017992D1 (en) 1995-04-27
US5142111A (en) 1992-08-25
FR2652199B1 (en) 1994-05-13
EP0419324B1 (en) 1995-03-22
JPH03133015A (en) 1991-06-06
DE69017992T2 (en) 1995-07-20
FR2652199A1 (en) 1991-03-22

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