EP3667824B1 - Terminal with compensation for clamping, particularly for an electrical protection device - Google Patents

Terminal with compensation for clamping, particularly for an electrical protection device Download PDF

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Publication number
EP3667824B1
EP3667824B1 EP19212096.2A EP19212096A EP3667824B1 EP 3667824 B1 EP3667824 B1 EP 3667824B1 EP 19212096 A EP19212096 A EP 19212096A EP 3667824 B1 EP3667824 B1 EP 3667824B1
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EP
European Patent Office
Prior art keywords
cage
terminal
cable
screw
clamping
Prior art date
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Active
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EP19212096.2A
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German (de)
French (fr)
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EP3667824A1 (en
Inventor
Javier Herreros
Michel ABADIE
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Schneider Electric Industries SAS
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Schneider Electric Industries SAS
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Publication of EP3667824A1 publication Critical patent/EP3667824A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/36—Conductive members located under tip of screw
    • H01R4/363—Conductive members located under tip of screw with intermediate part between tip and conductive member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/304—Clamped connections, spring connections utilising a screw or nut clamping member having means for improving contact
    • 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
    • H01H71/08—Terminals; Connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/38—Clamped connections, spring connections utilising a clamping member acted on by screw or nut

Definitions

  • the present invention relates to a connection terminal intended to electrically connect the connection pad of an electrical device to an electric cable or a tooth belonging to a connection device, said terminal comprising a cage of substantially parallelepiped shape produced by cutting and bending of a metal strip to form a frame delimiting an opening of quadrangular section intended for the insertion of the cable or of the aforementioned tooth, and the terminal further comprising a tightening screw screwed into a threaded hole provided in a so-called upper wall of the said cage, said screw being able to be driven in rotation so as to generate a relative displacement in translation between the pad and the cage, between a so-called tightening position in which the cable or the tooth is brought into electrical contact with the pad and a position called loose in which the cable or the tooth is no longer in electrical contact with the pad, said cage comprising a e upper wall, a lower wall and two side walls, said terminal further comprising clamping compensation means.
  • Terminals of the type mentioned above are known, used as upstream or downstream terminal in low voltage circuit breakers.
  • this type of terminal there is a phenomenon called accommodation of the copper of which the connection pad is made, also called creep over time, which phenomenon leads to a loss of contact pressure in the screw terminals, which can cause thermal runaway or fire.
  • these terminals do not include tightening compensation means. These terminals ensure connection capacity and resistance to maximum cable clamping force.
  • compensation systems are being implemented in the terminals of electrical devices, such as systems comprising attached elastic pads, systems with compensation blades, or the use of plastic deformation terminals, to compensate for the non- compliance with these tightening instructions.
  • the present invention solves these problems and proposes a connection terminal with clamping compensation making it possible to considerably reduce the risks of thermal runaway due to creep, this terminal guaranteeing operational safety over time, while allowing the installation of these terminals without modifications to the surrounding parts.
  • the present invention relates to a connection terminal of the kind mentioned above, as claimed in claim 1, this terminal being characterized in that the upper wall of the cage is formed by the superposition of two respectively upper and lower branches, respectively belonging to the two side walls, each of these branches being formed by bending the upper part of the side wall in the direction of the other side wall, these two branches each comprising an orifice for passing the screw , these two orifices facing each other, the outer end of the so-called upper arm of the cage being able to bear against the inner end of the so-called lower arm of the cage during tightening of the screw, this causing an elastic displacement of the entire cage, said cage having, in a section along a plane perpendicular to the side walls, substantially a diamond shape in the loosened position of the screw, and substantially a rectangle shape in the tightened position of the screw after the aforementioned elastic deformation.
  • the springback corresponding to the difference between, on the one hand, the height between the bottom of the cage and the connection pad during the load at the end of tightening and this same height after the load is between 0 .4 and 0.6 mm.
  • the material in which the cage is made is XC70 having mechanical properties and having undergone a heat treatment of R substantially equal to 1600 MPa, and Re substantially equal to 1200 MPa.
  • the working length defined as being the sum of the length of the upper wall, with the length of the lower wall, with the length of one of the side walls located on the side opposite the aforementioned fulcrum. is between 20 and 25 mm.
  • this terminal comprises at least one recess made in the cage at places of said cage having reduced stresses compared to the rest of the cage, in order to distribute the stresses evenly inside the walls of the cage.
  • this terminal comprises means for recentering the cables inside the opening of the terminal, these means making it possible to ensure an elastic return between 0.4mm and 0.6mm, whatever the initial positioning of the cable in the terminal.
  • these means comprise a connecting flap fixed to the bottom of the cage and capable of preventing the introduction of a cable under the terminal when the latter is tightened.
  • the present invention also relates to an electrical protection device comprising at least one upstream or downstream terminal comprising the characteristics mentioned above taken alone or in combination.
  • this device is a terminal low voltage circuit breaker.
  • a cage C belonging to a terminal B belonging to a terminal B according to a particular embodiment of the invention, this terminal being intended to be mounted in a housing 1 provided for this purpose in an electrical protection device such as a terminal low voltage circuit breaker D such that illustrated on the figures 5 to 7 and 10 .
  • This terminal B is intended to allow the electrical connection of a connection pad 2 belonging to the circuit breaker D to an external electrical connection element such as a cable c or a tooth belonging to a distribution comb.
  • this cage C has a substantially parallelepipedic shape, and is constituted by a sheet 3 bent so as to form a part shaped like a tunnel.
  • this cage C is formed by a part having four successive faces or walls, respectively a lower wall 4 and an upper wall 5, parallel to each other, and two side walls 6.7 parallel to each other. compared to the other.
  • the aforementioned upper wall 5 comprises a threaded hole 9 capable of receiving a screw 10, this screw 10 being mounted for rotation about its axis X with respect to the housing 11 of the apparatus D.
  • the aforementioned cage C is capable of being moved in translation relative to the housing 11 of the device D and thus to the connection pad 2 of the device D, parallel to the axis X of the screw 10 during the rotation of the screw.
  • the end part of connection pad 2 is placed inside opening O of terminal B and extends substantially parallel to bottom wall 4 of the cage C, that is to say the bottom wall.
  • this cage C is constituted by a strip of sheet metal cut and bent.
  • the total length of the sheet 3 of which the cage C is made has been increased while the thickness of the flanks or the side walls 6.7 has been reduced with respect respectively to the length and thickness of the sheet. 3 belonging to a terminal B of the conventional type.
  • This increase in length was achieved by an extension of one 7 of the side walls 6.7 from the free edge of the latter, so as to form a return 12 capable of being superimposed on the wall initially constituting the wall upper 5 of the cage C.
  • the upper wall of the cage is constituted by two branches 13,14 called respectively lower and upper, and corresponding respectively to the aforementioned initial lower wall 4 and to the return 12.
  • These two branches 13,14 each have a threaded hole 15,16, these two holes 15,16 facing each other so as to allow the introduction and screwing of the terminal screw 10.
  • this cage C was produced thanks to significant work in simulation-design, so as to obtain a homogeneous distribution of the stresses in the sidewalls and thus to obtain a substantially identical rigidity over the entire cage.
  • the elastic limit Re and the rupture limit R have been increased by about 45% compared to those of a conventional cage, and the thickness of the sheet has been reduced, compared to that of a cage of the classic type going from 1.5mm to 1.2mm, which corresponds to a reduction of 20%.
  • the working length L of the cage C corresponding to the sum of the length m of the lower wall 4, of the length n of the side wall 7 located on the side opposite to the free end of the return 12, and of the length o of the upper branch 14, has been increased by this length o of the upper branch, by modifying at the same time the fulcrum p with respect to that of a conventional bollard.
  • the support during the tightening of the screw 10 is exerted by the outer end 14a of the upper branch 14 on the inner end 13a of the so-called lower branch 13 of the sheet 3.
  • the working length L has been increased compared to that of the usual elastic terminals, with a width of approximately 9.51mm in this particular embodiment, which corresponds to an increase of approximately 41% compared to that of a terminal of the conventional type, the lengths m and n respectively of the lower side and the lateral side being respectively 9.04 and 13.78 mm.
  • the figure 4 more particularly illustrates the diamond shape of the cage C, when the screw 10 is in the untightened position, in a cross-sectional view along a plane passing through the axis X of the screw 10 and perpendicular to the side walls 6.7 of the cage C.
  • the shape of the cage C in section changes from an s shape corresponding substantially to a diamond to a v shape corresponding substantially to a rectangle, this latter shape being particularly illustrated on them figures 18 and 19 .
  • terminal B is in the charging position at the end of the tightening operation.
  • terminal B is in the end of tightening operation position, but is no longer in the load position.
  • the cage C is deformed following a creep of the bollard, in such a way that the height h2 between the connection pad 2 and the bottom wall 4 of the terminal on the figure 19 has increased with respect to the height h1 between the connection pad 2 and the bottom wall 4 of the terminal on the figure 18 .
  • a refocusing flap 17 of the cables is advantageously associated with the bottom wall 4 of the terminal in order to position the cables c in the half-part of the bottom wall of the terminal B undergoing the greatest elastic displacement.
  • this flap 17 is adapted to be removably fixed to the bottom wall 4 of the terminal B.
  • the bottom wall 4 facing the inner end 13a of the lower branch 13 and the outer end 14a of the upper branch 14 has very little deformation.
  • the figure 15 shows a cable positioned in this area.
  • the figure 16 shows the tightening of this cable, which slides thanks to the flap towards the center of the cage C. This allows, as illustrated on the figure 17 , to achieve a tightening on the optimal elastic zone.
  • the terminal with clamping compensation according to the invention meets the constraints of the current terminal in terms of resistance and connection capacity while ensuring an elastic return of approximately 0.5 mm.
  • a terminal with clamping compensation has therefore been produced for the terminal low voltage ranges, making it possible to provide clamping compensation when the wires are clamped, which can be installed in circuit breakers and auxiliaries, instead of instead of a terminal of the classic type, without any modification of the surrounding parts, this terminal to greatly reduce the risk of thermal runaway and therefore to increase the operating safety of the devices over time.
  • the invention therefore makes it possible to solve the two major problems, which are to reduce the risks of thermal runaway by ensuring operational safety over time and to allow the terminal to be placed in place and in place of the terminal in the device without impact on industrial costs, that is to say without it being necessary to modify moulds, cutting tools, assembly lines, no modification of envelope or range being necessary, which would imply a resumption of tools, or the management of an online publication.

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  • Connections Arranged To Contact A Plurality Of Conductors (AREA)
  • Connector Housings Or Holding Contact Members (AREA)

Description

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention concerne une borne de raccordement destinée à relier électriquement la plage de raccordement d'un appareil électrique à un câble électrique ou une dent appartenant à un dispositif de raccordement, ladite borne comportant une cage de forme sensiblement parallélépipèdique réalisée par découpage et pliage d'une bande métallique pour former un cadre délimitant une ouverture de section quadrangulaire destinée à l'insertion du câble ou de la dent précitée, et la borne comportant en outre une vis de serrage vissée dans un orifice taraudé prévu dans une paroi dite supérieure de la dite cage, ladite vis pouvant être entraînée en rotation de manière à engendrer un déplacement relatif en translation entre la plage et la cage, entre une position dite de serrage dans laquelle le câble ou la dent est amené en contact électrique avec la plage et une position dite desserrée dans laquelle le câble ou la dent n'est plus en contact électrique avec la plage, ladite cage comportant une paroi supérieure, une paroi inférieure et deux parois latérales, ladite borne comportant en outre des moyens de compensation de serrage.The present invention relates to a connection terminal intended to electrically connect the connection pad of an electrical device to an electric cable or a tooth belonging to a connection device, said terminal comprising a cage of substantially parallelepiped shape produced by cutting and bending of a metal strip to form a frame delimiting an opening of quadrangular section intended for the insertion of the cable or of the aforementioned tooth, and the terminal further comprising a tightening screw screwed into a threaded hole provided in a so-called upper wall of the said cage, said screw being able to be driven in rotation so as to generate a relative displacement in translation between the pad and the cage, between a so-called tightening position in which the cable or the tooth is brought into electrical contact with the pad and a position called loose in which the cable or the tooth is no longer in electrical contact with the pad, said cage comprising a e upper wall, a lower wall and two side walls, said terminal further comprising clamping compensation means.

ETAT DE LA TECHNIQUE ANTERIEURESTATE OF THE PRIOR ART

On connaît des bornes du type précédemment mentionné, utilisées en tant que borne amont ou aval dans les disjoncteurs basse tension. Dans ce type de borne, on observe un phénomène dit d'accommodation du cuivre dont est constituée la plage de raccordement, appelé aussi fluage dans le temps, lequel phénomène entraîne une perte de pression de contact dans les bornes à vis, ce qui peut provoquer un emballement thermique ou un incendie.Terminals of the type mentioned above are known, used as upstream or downstream terminal in low voltage circuit breakers. In this type of terminal, there is a phenomenon called accommodation of the copper of which the connection pad is made, also called creep over time, which phenomenon leads to a loss of contact pressure in the screw terminals, which can cause thermal runaway or fire.

Le plus souvent, ces bornes ne comportent pas de moyens de compensation de serrage. Ces bornes assurent une capacité de raccordement et une tenue à un effort maximum de serrage des câbles.Most often, these terminals do not include tightening compensation means. These terminals ensure connection capacity and resistance to maximum cable clamping force.

Des consignes de resserrage des vis de bornes sont usuellement données aux utilisateurs afin d'écarter tout risque.Instructions for tightening the terminal screws are usually given to users in order to avoid any risk.

Petit à petit, des systèmes de compensation sont mis en place dans les bornes des appareils électriques tels que des systèmes comportant des plaquettes élastiques rapportées, des systèmes à lames de compensation, ou l'utilisation de bornes à déformation plastique, pour pallier au non-respect de ces consignes de resserrage.Gradually, compensation systems are being implemented in the terminals of electrical devices, such as systems comprising attached elastic pads, systems with compensation blades, or the use of plastic deformation terminals, to compensate for the non- compliance with these tightening instructions.

Cependant, ces systèmes de compensation ne permettent pas de garantir une sécurité de fonctionnement dans le temps, sans modifications des pièces environnantes de la borne à l'intérieur de l'appareil. Il en résulte une augmentation des coûts industriels dues aux modifications qu'il est nécessaire de réaliser sur les moules, outillages de découpe, chaînes de montage, etc.... On connaît par exemple le document FR 2 798 514 ou le document JP H04-15164 U décrivant une borne du genre précédemment mentionné. Dans ce document, seule la moitié de la borne se déforme et non pas la borne complète. Dans ces bornes dans lesquelles la déformation élastique est limitée, la tenue de la borne est également limitée.However, these compensation systems do not make it possible to guarantee operational safety over time, without modifications to the parts surrounding the terminal inside the device. This results in an increase in industrial costs due to the modifications that it is necessary to carry out on the moulds, cutting tools, assembly lines, etc.... For example, the document FR 2 798 514 or the document JP H04-15164 U describing a terminal of the aforementioned kind. In this document, only half of the bollard is deformed and not the complete bollard. In these terminals in which the elastic deformation is limited, the resistance of the terminal is also limited.

EXPOSE DE L'INVENTIONDISCLOSURE OF THE INVENTION

La présente invention résout ces problèmes et propose une borne de raccordement à compensation de serrage permettant de réduire considérablement les risques d'emballement thermique dus au fluage, cette borne garantissant une sécurité de fonctionnement dans le temps, tout en permettant une mise en place de ces bornes sans modifications des pièces environnantes.The present invention solves these problems and proposes a connection terminal with clamping compensation making it possible to considerably reduce the risks of thermal runaway due to creep, this terminal guaranteeing operational safety over time, while allowing the installation of these terminals without modifications to the surrounding parts.

A cet effet, la présente invention a pour objet une borne de raccordement du genre précédemment mentionnée, telle que revendiquée dans la revendication 1, cette borne étant caractérisée en ce que la paroi supérieure de la cage est constituée par la superposition de deux branches respectivement supérieure et inférieure, appartenant respectivement aux deux parois latérales, chacune de ces branches étant formée par pliage de la partie supérieure de la paroi latérale en direction de l'autre paroi latérale, ces deux branches comportant chacune un orifice de passage de la vis, ces deux orifices étant en regard l'un par rapport à l'autre, l'extrémité extérieure de la branche dite supérieure de la cage étant apte à venir en appui sur l'extrémité intérieure de la branche dite inférieure de la cage lors du serrage de la vis, ceci engendrant un déplacement élastique de toute la cage, ladite cage présentant dans une coupe selon un plan perpendiculaire aux parois latérales, sensiblement une forme de losange en position desserrée de la vis, et sensiblement une forme de rectangle en position serrée de la vis après la déformation élastique précitée.To this end, the present invention relates to a connection terminal of the kind mentioned above, as claimed in claim 1, this terminal being characterized in that the upper wall of the cage is formed by the superposition of two respectively upper and lower branches, respectively belonging to the two side walls, each of these branches being formed by bending the upper part of the side wall in the direction of the other side wall, these two branches each comprising an orifice for passing the screw , these two orifices facing each other, the outer end of the so-called upper arm of the cage being able to bear against the inner end of the so-called lower arm of the cage during tightening of the screw, this causing an elastic displacement of the entire cage, said cage having, in a section along a plane perpendicular to the side walls, substantially a diamond shape in the loosened position of the screw, and substantially a rectangle shape in the tightened position of the screw after the aforementioned elastic deformation.

Selon une caractéristique particulière, le retour élastique correspondant à la différence entre d'une part, la hauteur entre le fond de la cage et la plage de raccordement pendant la charge en fin de serrage et cette même hauteur après la charge, est compris entre 0,4 et 0,6 mm.According to one particular characteristic, the springback corresponding to the difference between, on the one hand, the height between the bottom of the cage and the connection pad during the load at the end of tightening and this same height after the load, is between 0 .4 and 0.6 mm.

Selon une autre caractéristique, la matière dans laquelle est réalisée la cage est du XC70 présentant des propriétés mécaniques et ayant subi un traitement thermique de R sensiblement égal à 1600 MPa, et Re sensiblement égal à 1200 MPa.According to another characteristic, the material in which the cage is made is XC70 having mechanical properties and having undergone a heat treatment of R substantially equal to 1600 MPa, and Re substantially equal to 1200 MPa.

Selon une autre caractéristique, la longueur de travail définie comme étant la somme de la longueur de la paroi supérieure, avec la longueur de la paroi inférieure, avec la longueur de l'une des parois latérales située du côté opposé au point d'appui précité est comprise entre 20 et 25 mm.According to another characteristic, the working length defined as being the sum of the length of the upper wall, with the length of the lower wall, with the length of one of the side walls located on the side opposite the aforementioned fulcrum. is between 20 and 25 mm.

Selon une autre caractéristique, cette borne comporte au moins un évidement réalisé dans la cage en des endroits de ladite cage présentant des contraintes réduites par rapport au reste de la cage, afin de répartir les contraintes de manière égale à l'intérieur des parois de la cage.According to another characteristic, this terminal comprises at least one recess made in the cage at places of said cage having reduced stresses compared to the rest of the cage, in order to distribute the stresses evenly inside the walls of the cage.

Selon une autre caractéristique, cette borne comporte des moyens de recentrage des câbles à l'intérieur de l'ouverture de la borne, ces moyens permettant d'assurer un retour élastique entre 0,4mm et 0,6mm, quel que soit le positionnement initial du câble dans la borne.According to another characteristic, this terminal comprises means for recentering the cables inside the opening of the terminal, these means making it possible to ensure an elastic return between 0.4mm and 0.6mm, whatever the initial positioning of the cable in the terminal.

Selon une autre caractéristique, ces moyens comportent une bavette de raccordement fixée sur le fond de la cage et apte à empêcher l'introduction d'un câble sous la borne lorsque celle-ci est serrée.According to another characteristic, these means comprise a connecting flap fixed to the bottom of the cage and capable of preventing the introduction of a cable under the terminal when the latter is tightened.

La présente invention a encore pour objet un appareil de protection électrique comportant au moins une borne amont ou aval comportant les caractéristiques précédemment mentionnées prises seules ou en combinaison.The present invention also relates to an electrical protection device comprising at least one upstream or downstream terminal comprising the characteristics mentioned above taken alone or in combination.

Selon une caractéristique particulière, cet appareil est un disjoncteur basse tension terminale.According to a particular characteristic, this device is a terminal low voltage circuit breaker.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

Mais d'autres avantages et caractéristiques de l'invention apparaîtront mieux dans la description détaillée qui suit et se réfère aux dessins annexés donnés uniquement à titre d'exemple et dans lesquels.

  • [Fig. 1-2] - Les figures 1 et 2 sont deux vues en perspective selon deux orientations différentes, d'une cage appartenant à une borne selon une réalisation particulière de l'invention,
  • [Fig. 3-4] - La figure 3 est une vue en coupe de la cage précédente, selon un plan perpendiculaire aux parois latérales de la cage, et permettant d'illustrer les variations de dimension de cette cage par rapport à une cage selon l'art antérieur,
  • - La figure 4 est une vue en coupe identique à la figure précédente, mais illustrant plus particulièrement la forme de la cage en position desserrée de la borne,
  • [Fig. 5-6] - Les figures 5 et 6 sont deux vues partielles en perspective, illustrant une borne selon l'invention mise en place à l'intérieur d'un disjoncteur, respectivement dans une position desserrée et une position serrée de la vis de borne,
  • [Fig. 7] - La figure 7 est une vue en coupe de la borne selon un plan P-P de la figure 5,
  • [Fig. 8] - La figure 8 est une vue en perspective illustrant la borne avec sa vis de borne et la partie d'extrémité de la plage de raccordement,
  • [Fig. 9] - La figure 9 est une vue identique à la figure précédente, sans la vis de serrage et sans la plage de raccordement,
  • [Fig. 10] - La figure 10 est une vue partielle en perspective d'une borne selon l'invention montée dans un disjoncteur, mais illustrant plus particulièrement la bavette de raccordement associée au fond de cette borne,
  • [Fig. 11] - La figure 11 est une vue en perspective de la borne seule, vue de l'avant,
  • [Fig. 12] - La figure 12 est une vue en perspective de cette même borne, vue de l'arrière,
  • [Fig. 13-14] - Les figures 13 et 14 sont deux vues en perspective de la bavette de raccordement seule, selon deux orientations différentes de cette bavette,
  • [Fig. 15-17] - Les figures 15, 16 et 17 sont des vues partielles en coupe illustrant trois positions successives d'un câble au fond de la borne, pendant le serrage de la vis de borne, et
  • [Fig. 18-19] - Les figures 18 et 19 sont des vues en coupe similaires à la figure 3, illustrant respectivement une borne pendant la charge en fin de serrage, et cette même borne après la charge.
But other advantages and characteristics of the invention will appear better in the detailed description which follows and refers to the appended drawings given solely by way of example and in which.
  • [ Fig. 1-2 ] - The figures 1 and 2 are two perspective views according to two different orientations, of a cage belonging to a terminal according to a particular embodiment of the invention,
  • [ Fig. 3-4 ] - The picture 3 is a sectional view of the previous cage, along a plane perpendicular to the side walls of the cage, and making it possible to illustrate the variations in dimension of this cage compared to a cage according to the prior art,
  • - The figure 4 is a sectional view identical to the previous figure, but illustrating more particularly the shape of the cage in the loosened position of the terminal,
  • [ Fig. 5-6 ] - The figures 5 and 6 are two partial perspective views, illustrating a terminal according to the invention placed inside a circuit breaker, respectively in a loosened position and a tightened position of the terminal screw,
  • [ Fig. 7 ] - The figure 7 is a cross-sectional view of the terminal along a plane PP of the figure 5 ,
  • [ Fig. 8 ] - The figure 8 is a perspective view illustrating the terminal with its terminal screw and the end part of the connection pad,
  • [ Fig. 9 ] - The figure 9 is a view identical to the previous figure, without the tightening screw and without the connection pad,
  • [ Fig. 10 ] - The figure 10 is a partial perspective view of a terminal according to the invention mounted in a circuit breaker, but illustrating more particularly the connecting flap associated with the bottom of this terminal,
  • [ Fig. 11 ] - The figure 11 is a perspective view of the terminal alone, seen from the front,
  • [ Fig. 12 ] - The figure 12 is a perspective view of this same bollard, seen from the rear,
  • [ Fig. 13-14 ] - The figures 13 and 14 are two perspective views of the connecting flap alone, in two different orientations of this flap,
  • [ Fig. 15-17 ] - The figures 15, 16 and 17 are partial sectional views illustrating three successive positions of a cable at the bottom of the terminal, during the tightening of the terminal screw, and
  • [ Fig. 18-19 ] - The figures 18 and 19 are sectional views similar to the picture 3 , respectively illustrating a terminal during charging at the end of tightening, and this same terminal after charging.

DESCRIPTION DETAILLEE DE MODES DE REALISATIONDETAILED DESCRIPTION OF EMBODIMENTS

Sur les figures 1 et 2, on voit une cage C appartenant à une borne B selon une réalisation particulière de l'invention, cette borne étant destinée à être montée dans un logement 1 prévu à cet effet dans un appareil de protection électrique tel un disjoncteur basse tension terminal D tel qu'illustré sur les figures 5 à 7 et 10. Cette borne B est destinée à permettre le raccordement électrique d'une plage de raccordement 2 appartenant au disjoncteur D à un élément de raccordement électrique extérieur tel un câble c ou une dent appartenant à un peigne de distribution.On the figures 1 and 2 , we see a cage C belonging to a terminal B according to a particular embodiment of the invention, this terminal being intended to be mounted in a housing 1 provided for this purpose in an electrical protection device such as a terminal low voltage circuit breaker D such that illustrated on the figures 5 to 7 and 10 . This terminal B is intended to allow the electrical connection of a connection pad 2 belonging to the circuit breaker D to an external electrical connection element such as a cable c or a tooth belonging to a distribution comb.

De manière connue en soi, cette cage C présente une forme sensiblement parallélépipèdique, et est constituée par une tôle 3 pliée de manière à former une pièce conformée en tunnel. Ainsi, cette cage C est formée par une pièce présentant quatre faces ou parois successives, respectivement une paroi inférieure 4 et une paroi supérieure 5, parallèles l'une par rapport à l'autre, et deux parois latérales 6,7 parallèles l'une par rapport à l'autre. La paroi supérieure précitée 5 comporte un orifice taraudé 9 apte à recevoir une vis 10, cette vis 10 étant montée à rotation autour de son axe X par rapport au boîtier 11 de l'appareil D. La cage précitée C est apte à être déplacée en translation par rapport au boîtier 11 de l'appareil D et ainsi à la plage de raccordement 2 de l'appareil D, parallèlement à l'axe X de la vis 10 lors de la rotation de la vis. Lors du montage de la borne B dans l'appareil D, la partie d'extrémité de la plage de raccordement 2 est placée à l'intérieur de l'ouverture O de la borne B et s'étend sensiblement parallèlement à la paroi inférieure 4 de la cage C, c'est-à-dire la paroi de fond.In a manner known per se, this cage C has a substantially parallelepipedic shape, and is constituted by a sheet 3 bent so as to form a part shaped like a tunnel. Thus, this cage C is formed by a part having four successive faces or walls, respectively a lower wall 4 and an upper wall 5, parallel to each other, and two side walls 6.7 parallel to each other. compared to the other. The aforementioned upper wall 5 comprises a threaded hole 9 capable of receiving a screw 10, this screw 10 being mounted for rotation about its axis X with respect to the housing 11 of the apparatus D. The aforementioned cage C is capable of being moved in translation relative to the housing 11 of the device D and thus to the connection pad 2 of the device D, parallel to the axis X of the screw 10 during the rotation of the screw. When mounting terminal B in device D, the end part of connection pad 2 is placed inside opening O of terminal B and extends substantially parallel to bottom wall 4 of the cage C, that is to say the bottom wall.

L'actionnement de la vis 10 dans le sens du serrage, après l'introduction de la partie d'extrémité d'un câble c dans l'orifice O de borne B, entraîne le déplacement de la cage C en direction de la tête 10a de vis 10, ce qui entraîne l'amenée du câble c en contact avec la partie d'extrémité de la plage de raccordement 2, réalisant ainsi le raccordement électrique entre le câble c et la plage 2. Avantageusement, cette cage C est constituée par une bande de tôle découpée et pliée.The actuation of the screw 10 in the direction of tightening, after the introduction of the end part of a cable c into the orifice O of terminal B, causes the displacement of the cage C in the direction of the head 10a of screws 10, which causes the cable c to be brought into contact with the end part of the connection pad 2, thus producing the electrical connection between the cable c and the pad 2. Advantageously, this cage C is constituted by a strip of sheet metal cut and bent.

Conformément à l'invention, la longueur totale de la tôle 3 dont est constituée la cage C a été augmentée tandis que l'épaisseur des flancs ou des parois latérales 6,7, a été diminuée par rapport respectivement aux longueur et épaisseur de la tôle 3 appartenant à une borne B du type classique. Cette augmentation de la longueur a été réalisée par une prolongation de l'une 7 des parois latérales 6,7 à partir du bord libre de cette dernière, de manière à former un retour 12 apte à venir se superposer à la paroi constituant initialement la paroi supérieure 5 de la cage C. Ainsi, l'on peut dire que la paroi supérieure de la cage est constituée par deux branches 13,14 dites respectivement inférieure et supérieure, et correspondant respectivement à la paroi inférieure initiale précitée 4 et au retour 12. Ces deux branches 13,14 comportent chacune un orifice taraudé 15,16, ces deux orifices 15,16 étant en regard l'un par rapport à l'autre de manière à permettre l'introduction et le vissage de la vis de borne 10.In accordance with the invention, the total length of the sheet 3 of which the cage C is made has been increased while the thickness of the flanks or the side walls 6.7 has been reduced with respect respectively to the length and thickness of the sheet. 3 belonging to a terminal B of the conventional type. This increase in length was achieved by an extension of one 7 of the side walls 6.7 from the free edge of the latter, so as to form a return 12 capable of being superimposed on the wall initially constituting the wall upper 5 of the cage C. Thus, we can say that the upper wall of the cage is constituted by two branches 13,14 called respectively lower and upper, and corresponding respectively to the aforementioned initial lower wall 4 and to the return 12. These two branches 13,14 each have a threaded hole 15,16, these two holes 15,16 facing each other so as to allow the introduction and screwing of the terminal screw 10.

Selon la réalisation de l'invention illustrée sur les figures, cette cage C a été réalisée grâce à un important travail en simulation-conception, de manière à obtenir une répartition homogène des contraintes dans les flancs et ainsi obtenir une rigidité sensiblement identique sur toute la cage.According to the embodiment of the invention illustrated in the figures, this cage C was produced thanks to significant work in simulation-design, so as to obtain a homogeneous distribution of the stresses in the sidewalls and thus to obtain a substantially identical rigidity over the entire cage.

Ainsi, ce travail en simulation-conception a permis de visualiser la répartition des contraintes dans la cage. Puis, des orifices ou évidements 8 ont été réalisés dans les flancs 6,7 de la cage en des endroits de la cage présentant le moins de contraintes, en compensation de quoi l'épaisseur globale de la tôle a été augmentée de manière à conserver une certaine tenue de la cage. Puis, en utilisant une matière performante, il a été possible de réduire légèrement l'épaisseur de la tôle tout en conservant une tenue maximale. Ainsi, alors que les matières usuelles utilisées sont plutôt du C45 (XC45) présentant des propriétés mécaniques et ayant subi un traitement thermique de R=1100Mpa, Re=850MPa, dans cette réalisation de l'invention, on utilise plutôt du C70(XC70) présentant des propriétés mécaniques et ayant subi un traitement thermique de R=1600MPa, Re=1200MPa.Thus, this simulation-design work made it possible to visualize the distribution of stresses in the cage. Then, orifices or recesses 8 were made in the sides 6.7 of the cage in places of the cage presenting the least stresses, in compensation for which the overall thickness of the sheet was increased so as to maintain a certain behavior of the cage. Then, by using a high-performance material, it was possible to slightly reduce the thickness of the sheet while maintaining maximum strength. Thus, while the usual materials used are rather C45 (XC45) having mechanical properties and having undergone a heat treatment of R=1100Mpa, Re=850MPa, in this embodiment of the invention, C70 (XC70) is used instead. having mechanical properties and having undergone a heat treatment of R=1600MPa, Re=1200MPa.

Ainsi, la limite élastique Re et la limite de rupture R ont été augmentées d'environ 45% par rapport à celles d'une cage classique, et l'épaisseur de la tôle a été réduite, par rapport à celle d'une cage du type classique passant de 1,5mm à 1,2mm, ce qui correspond à une réduction de 20%.Thus, the elastic limit Re and the rupture limit R have been increased by about 45% compared to those of a conventional cage, and the thickness of the sheet has been reduced, compared to that of a cage of the classic type going from 1.5mm to 1.2mm, which corresponds to a reduction of 20%.

Tel qu'illustré sur la figure 3, la longueur de travail L de la cage C, correspondant à la somme de la longueur m de la paroi inférieure 4, de la longueur n de la paroi latérale 7 située du côté opposé à l'extrémité libre du retour 12, et de la longueur o de la branche supérieure 14, a été augmentée de cette longueur o de la branche supérieure, en modifiant en même temps le point d'appui p par rapport à celui d'une borne classique. Ainsi, l'appui lors du serrage de la vis 10 s'exerce par l'extrémité extérieure 14a de la branche supérieure 14 sur l'extrémité intérieure 13a de la branche dite inférieure 13 de la tôle 3. Ainsi, la longueur de travail L a été augmentée par rapport à celle des bornes élastiques habituelles, d'une largeur d'environ 9,51mm dans cette réalisation particulière, ce qui correspond à une augmentation d'environ 41% par rapport à celle d'une borne du type classique, les longueurs m et n respectivement du côté inférieur et du côté latéral étant respectivement de 9,04 et 13,78 mm.As shown on the picture 3 , the working length L of the cage C, corresponding to the sum of the length m of the lower wall 4, of the length n of the side wall 7 located on the side opposite to the free end of the return 12, and of the length o of the upper branch 14, has been increased by this length o of the upper branch, by modifying at the same time the fulcrum p with respect to that of a conventional bollard. Thus, the support during the tightening of the screw 10 is exerted by the outer end 14a of the upper branch 14 on the inner end 13a of the so-called lower branch 13 of the sheet 3. Thus, the working length L has been increased compared to that of the usual elastic terminals, with a width of approximately 9.51mm in this particular embodiment, which corresponds to an increase of approximately 41% compared to that of a terminal of the conventional type, the lengths m and n respectively of the lower side and the lateral side being respectively 9.04 and 13.78 mm.

La figure 4 illustre plus particulièrement la forme en losange de la cage C, lorsque la vis 10 est en position non serrée, dans une vue en coupe selon un plan passant par l'axe X de la vis 10 et perpendiculaire aux parois latérales 6,7 de la cage C. Lors du serrage de la vis de borne 10, la forme de la cage C en coupe, passe d'une forme s correspondant sensiblement à un losange à une forme v correspondant sensiblement à un rectangle, cette dernière forme étant particulièrement illustrée sur les figures 18 et 19.The figure 4 more particularly illustrates the diamond shape of the cage C, when the screw 10 is in the untightened position, in a cross-sectional view along a plane passing through the axis X of the screw 10 and perpendicular to the side walls 6.7 of the cage C. When tightening the terminal screw 10, the shape of the cage C in section changes from an s shape corresponding substantially to a diamond to a v shape corresponding substantially to a rectangle, this latter shape being particularly illustrated on them figures 18 and 19 .

Sur la figure 18, la borne B est en position de charge à la fin de la manœuvre de serrage. Sur la figure 19, la borne B est en position de fin de manœuvre de serrage, mais n'est plus en position de charge. Entre ces deux positions, la cage C s'est déformée suite à un fluage de la borne, de telle manière que la hauteur h2 entre la plage de raccordement 2 et la paroi de fond 4 de la borne sur la figure 19 a augmentée par rapport à la hauteur h1 entre la plage de raccordement 2 et la paroi de fond 4 de la borne sur la figure 18.On the figure 18 , terminal B is in the charging position at the end of the tightening operation. On the figure 19 , terminal B is in the end of tightening operation position, but is no longer in the load position. Between these two positions, the cage C is deformed following a creep of the bollard, in such a way that the height h2 between the connection pad 2 and the bottom wall 4 of the terminal on the figure 19 has increased with respect to the height h1 between the connection pad 2 and the bottom wall 4 of the terminal on the figure 18 .

Cette différence de hauteur h2 - h1 correspond au retour élastique de la borne en cas de fluage.This difference in height h2 - h1 corresponds to the springback of the bollard in the event of creep.

Afin de pallier au problème d'une variation du retour élastique en fonction de la position du câble c sur la paroi de fond de la borne, ce retour élastique étant d'environ 0,1 mm du côté gauche et d'environ 0,9 mm du côté droit de la paroi de fond de la borne, une bavette de recentrage 17 des câbles est avantageusement associée à la paroi de fond 4 de la borne afin de positionner les câbles c dans la demi-partie de la paroi de fond de la borne B subissant le déplacement élastique le plus important. Tel qu'illustré sur les figures 10 à 17, cette bavette 17 est apte à être fixée de manière amovible à la paroi de fond 4 de la borne B. La paroi de fond 4 en regard de l'extrémité intérieure 13a de la branche inférieure 13 et de l'extrémité extérieure 14a de la branche supérieure 14 présente une déformation très faible. La figure 15 montre un câble positionné dans cette zone. La figure 16 montre le serrage de ce câble, lequel vient glisser grâce à la bavette vers le centre de la cage C. Cela permet, tel qu'illustré sur la figure 17, de réaliser un serrage sur la zone élastique optimale.In order to overcome the problem of a variation of the elastic return as a function of the position of the cable c on the bottom wall of the terminal, this elastic return being approximately 0.1 mm on the left side and approximately 0.9 mm from the right side of the bottom wall of the terminal, a refocusing flap 17 of the cables is advantageously associated with the bottom wall 4 of the terminal in order to position the cables c in the half-part of the bottom wall of the terminal B undergoing the greatest elastic displacement. As shown on the figures 10 to 17 , this flap 17 is adapted to be removably fixed to the bottom wall 4 of the terminal B. The bottom wall 4 facing the inner end 13a of the lower branch 13 and the outer end 14a of the upper branch 14 has very little deformation. The figure 15 shows a cable positioned in this area. The figure 16 shows the tightening of this cable, which slides thanks to the flap towards the center of the cage C. This allows, as illustrated on the figure 17 , to achieve a tightening on the optimal elastic zone.

Grâce à l'invention, il est possible d'obtenir un retour élastique de 0,5 mm en fin de serrage de la vis.Thanks to the invention, it is possible to obtain an elastic return of 0.5 mm at the end of tightening the screw.

La borne à compensation de serrage selon l'invention, dite borne losange, répond aux contraintes de la borne actuelle de tenue et de capacité de raccordement tout en assurant un retour élastique d'environ 0,5mm.The terminal with clamping compensation according to the invention, called a diamond terminal, meets the constraints of the current terminal in terms of resistance and connection capacity while ensuring an elastic return of approximately 0.5 mm.

On a donc réalisé grâce à l'invention une borne à compensation de serrage pour les gammes basse tension terminal, permettant d'assurer une compensation de serrage lors du serrage des fils, pouvant être mise en place dans les disjoncteurs et auxiliaires, en lieu et place d'une borne du type classique, sans aucunes modifications des pièces environnantes, cette borne permettant de réduire fortement les risques d'emballement thermiques et donc d'augmenter la sécurité de fonctionnement dans le temps des appareils.Thanks to the invention, a terminal with clamping compensation has therefore been produced for the terminal low voltage ranges, making it possible to provide clamping compensation when the wires are clamped, which can be installed in circuit breakers and auxiliaries, instead of instead of a terminal of the classic type, without any modification of the surrounding parts, this terminal to greatly reduce the risk of thermal runaway and therefore to increase the operating safety of the devices over time.

L'invention permet donc de résoudre les deux problématiques majeurs, lesquels sont de réduire les risques d'emballement thermique en assurant une sécurité de fonctionnement dans le temps et de permettre une mise en lieu et place de la borne dans l'appareil sans impact sur les couts industriels, c'est-à-dire sans qu'il soit nécessaire de modifier des moules, des outillages de découpe, des chaînes de montage, aucune modification d'enveloppe ou de plage n'étant nécessaire, qui impliquerait une reprise d'outillage, ou bien la gestion d'une mise en ligne.The invention therefore makes it possible to solve the two major problems, which are to reduce the risks of thermal runaway by ensuring operational safety over time and to allow the terminal to be placed in place and in place of the terminal in the device without impact on industrial costs, that is to say without it being necessary to modify moulds, cutting tools, assembly lines, no modification of envelope or range being necessary, which would imply a resumption of tools, or the management of an online publication.

Bien entendu, l'invention n'est pas limitée au mode de réalisation décrit et illustré qui n'a été donné qu'à titre d'exemple.Of course, the invention is not limited to the embodiment described and illustrated which has been given by way of example only.

Au contraire, l'invention comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci sont réalisées conformément aux revendications annexées.On the contrary, the invention includes all the technical equivalents of the means described as well as their combinations if these are carried out in accordance with the appended claims.

Claims (9)

  1. A connection terminal (B) for electrically connecting the connection area (2) of an electrical appliance (D) to an electric cable (c) or a tooth belonging to a connection device, said terminal including a cage (C) have a substantially parallelepipedal shape made by cutting and bending a metal strip (3) to form a frame delimiting an opening (O) of quadrangular section intended for the insertion of the aforementioned cable or tooth and the terminal further including a clamping screw screwed into a tapped orifice provided in a so-called upper wall of said cage, said screw being able to be rotated so as to cause a relative translational movement between the area and the cage, between a so-called clamping position (10) in which the cable or the tooth is brought into electrical contact with the area and a so-called loosened position in which the cable or the tooth is no longer in electrical contact with the area, said cage including an upper wall, a bottom wall (4) and two side walls, said terminal further including clamping compensation means, wherein the upper wall (5) of the cage (C) is constituted by the superposition of two branches (13, 14), respectively lower and upper, respectively belonging to the two side walls (6, 7), each of these branches (13, 14) being formed by bending an upper part of the side wall (6, 7) toward the other side wall (6, 7), these two branches (13, 14) each including a tapped orifice (15, 16) for passage of the screw (10), these two orifices (15, 16) being opposite one another,
    characterized in that an outer end (14a) of the upper branch (14) of the cage (C) is able to bear at a bearing point (p) on an inner end (13a) of the lower branch (13) of the cage (C) during the tightening of the screw (10), this causing an elastic movement of the entire cage (C), said cage having, in section in a plane perpendicular to the side walls (6, 7), a substantially diamond-shaped section (s) in the loosened position of the screw (10), and a substantially rectangular section (v) in the tightened position of the screw after the aforementioned elastic deformation.
  2. The terminal according to claim 1, characterized in that the elastic return corresponding to the difference between, on the one hand, the height (h2) between the bottom wall (4) of the cage (C) and the connection area (2) during the load at the end of clamping and, on the other hand, this same height (h1) after loading, is between 0.4 and 0.6 mm.
  3. The terminal according to claim 1 or 2, characterized in that the material from which the cage (C) is made is XC70 having mechanical properties and having undergone a heat treatment with R substantially equal to 1600 MPa, and Re substantially equal to 1200 MPa.
  4. The terminal according to any one of the preceding claims, characterized in that a working length (L) defined as the sum of the length o of the upper wall (5), the length (m) of the bottom wall (4) and the length (n) of one of the side walls (6, 7) located on the side opposite the bearing point (p) is between 20 mm and 25 mm.
  5. The terminal according to any one of the preceding claims, characterized in that it includes at least one recess (8) made in the cage (C) in locations of said cage (C) having reduced constraints relative to the rest of the cage, so as to distribute the constraints evenly inside the walls (4, 5, 6, 7) of the cage (C).
  6. The terminal according to any one of claims 2 to 5, characterized in that it includes means (17) for recentering the cable (c) inside the opening (O) of the terminal (B), these means making it possible to ensure an elastic return between 0.4 mm and 0.6 mm, irrespective of the initial position of the cable (c) in the terminal (B).
  7. The terminal according to claim 6, characterized in that these recentering means include a connection flap (17) fixed on the bottom wall (4) of the cage (C) and able to prevent a cable from being introduced under the terminal when the latter is tightened.
  8. An electrical protection apparatus including at least one upstream or downstream terminal (B) according to any one of the preceding claims.
  9. The electrical protection apparatus according to claim 8, characterized in that it is a terminal low-voltage circuit breaker (D).
EP19212096.2A 2018-12-13 2019-11-28 Terminal with compensation for clamping, particularly for an electrical protection device Active EP3667824B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1872812A FR3090225B1 (en) 2018-12-13 2018-12-13 TERMINAL WITH TIGHTENING COMPENSATION IN PARTICULAR FOR AN ELECTRICAL PROTECTION DEVICE.

Publications (2)

Publication Number Publication Date
EP3667824A1 EP3667824A1 (en) 2020-06-17
EP3667824B1 true EP3667824B1 (en) 2023-01-04

Family

ID=66690497

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Application Number Title Priority Date Filing Date
EP19212096.2A Active EP3667824B1 (en) 2018-12-13 2019-11-28 Terminal with compensation for clamping, particularly for an electrical protection device

Country Status (2)

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EP (1) EP3667824B1 (en)
FR (1) FR3090225B1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0415164U (en) * 1990-05-29 1992-02-06
DE4322790C2 (en) * 1993-07-08 1996-03-07 Hirschmann Richard Gmbh Co Screw clamp with u-shaped clamp body
US6074121A (en) * 1997-06-30 2000-06-13 Thomas & Betts Corporation Fastening lug
FR2798514B1 (en) 1999-09-15 2001-11-02 Schneider Electric Ind Sa ELASTIC CAGE CONNECTION TERMINAL
FR2917243B1 (en) * 2007-06-11 2009-07-10 Schneider Electric Ind Sas ELECTRICAL CONNECTION TERMINAL AND ELECTRICAL PROTECTION APPARATUS COMPRISING SUCH A TERMINAL

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Publication number Publication date
EP3667824A1 (en) 2020-06-17
FR3090225B1 (en) 2020-11-27
FR3090225A1 (en) 2020-06-19

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