EP2904623B1 - Electrical contact device of the contact finger type with a strong nominal current - Google Patents

Electrical contact device of the contact finger type with a strong nominal current Download PDF

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Publication number
EP2904623B1
EP2904623B1 EP13767003.0A EP13767003A EP2904623B1 EP 2904623 B1 EP2904623 B1 EP 2904623B1 EP 13767003 A EP13767003 A EP 13767003A EP 2904623 B1 EP2904623 B1 EP 2904623B1
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EP
European Patent Office
Prior art keywords
contact
flexible rod
nominal current
connection element
electrical
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.)
Active
Application number
EP13767003.0A
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German (de)
French (fr)
Other versions
EP2904623A1 (en
Inventor
Didier Rodrigues
Denis Frigiere
Jean Marc Willieme
Frank Jacquier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Technology GmbH
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General Electric Technology GmbH
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Publication date
Application filed by General Electric Technology GmbH filed Critical General Electric Technology GmbH
Publication of EP2904623A1 publication Critical patent/EP2904623A1/en
Application granted granted Critical
Publication of EP2904623B1 publication Critical patent/EP2904623B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5822—Flexible connections between movable contact and terminal
    • H01H2001/5827—Laminated connections, i.e. the flexible conductor is composed of a plurality of thin flexible conducting layers

Definitions

  • the invention relates to a contact contact type electric contact device with a high current rating
  • FIG. figure 1 A first known example of making a contact-type electrical contact between a first part 10 and a second part 11 is illustrated in FIG. figure 1 .
  • the electrical contact is made by a contact pad 12 applied on a conductive surface of the second piece 11 along a contact zone 13, metal strips 14 and a flexible rod 15.
  • These blades which are connected to a mechanical joint element 16 and electrical to the first piece 10 ensure the passage of the current between the contact pad 12 and the element 16.
  • the flexible rod 15 provides a spring function and allows to achieve the contact force without ensuring electrical current flow.
  • a second known example of producing a contact-type electrical contact consists of a monoblock contact whose three functions of electrical contact, electrical current flow and spring described above are made in one element obtained for example by machining or stamping.
  • This second example constitutes an economic embodiment.
  • a difficulty remains because of the joint dimensioning of the current flow function and the spring function.
  • the current flow function involves a choice of materials having satisfactory conductive properties to limit heating: typically copper, aluminum or their alloys. But the use of such materials to ensure the spring function causes significant limits on the contact dimensions, especially because of the constraints and the resulting effort, in particular because of a maximum stress not to be exceeded in the material . It follows that for a given size, this second example has a limit value of nominal current.
  • the object of the invention is to modify such a monobloc contact, or design close to such a monobloc contact, to increase the nominal current in a given space.
  • US 1,776,138 discloses an electrical contact finger having a movable contact arm having a removable termination at one of its ends, its other end being bent and equipped to take a rotational movement, and a deflection spring.
  • US 2,636,955 discloses an electrical box of the type comprising contacts on a cover which mate with corresponding contacts in the box when the cover is closed on the box, and means for receiving a replaceable fuse in the cover.
  • the invention relates to a high-current contact-type electrical contact device with a high current between a first part which is conductive and a conductive surface of a second part, this device comprising a flexible rod connected to a first mechanical joining element and to the first piece, a contact portion applied to the conductive surface of the second piece and at least one metal contact blade disposed at a first end between a first end of the shank and the first piece characterized in that the flexible shank is conductive and in that the at least one metal blade is at its second end connected to the second end of the flexible rod with a second mechanical and electrical connection element.
  • the first joining element may comprise a screw or a rivet.
  • the second joining element may comprise a rivet.
  • the second joining element can be made by crimping and deformation of a prominent part of a contact pad.
  • the first joining element can be connected to the first part by screwing.
  • the flexible rod and the contact portion form a single piece.
  • the flexible rod and the contact portion are made of copper, aluminum or one of their alloys.
  • the device of the invention makes it possible to increase the nominal current for a given size.
  • a conductive flexible elongate contact element 20 which is the main conductor of the electric current, provides a spring function and a contact pad function. It can be made in one piece, as illustrated on the figure 2 , or in two pieces, as shown on the figure 3 .
  • At least one metal blade 21 forms a complement of section for the passage of electric current so as to obtain a simple structure of the finger in a given size allowing the passage of a maximum nominal current.
  • the contact element 20 comprises a first portion 22 in the form of a rod and a second portion 23 in the form of contact pads which can be part of the same part or two separate parts.
  • a first end of the at least one blade 21 is disposed between the first part 10 and the first end of the first part of the conductive part 20, itself connected to this first part 10 via the joining element 16.
  • a second end of the at least one blade 21 is connected to the second end of the first portion 22 of the contact element 20 by a mechanical and electrical connecting element 24.
  • the at least one contact blade makes it possible to increase the nominal current without increasing the contact force.
  • the reference 25 represents the zone of contact between the second part 23 of the contact element 20 and the conductive surface 26 of the second part 11.
  • FIGS. 4 to 6 illustrate exemplary embodiments of the first and second joining members 16 and 24.
  • first joining element 16 illustrated in FIG. 4:
  • This first joining element 16 can be made using a screw or a rivet 30 connecting the contact element 20 and the contact blade or blades 21 to the first part 10. A single connection then ensures the junction of the three elements: first part 10, metal blades 21 and contact element 20.
  • a force distribution washer 31 disposed under the head screw or rivet.
  • the second junction of the blade or blades 21 and the contact element 20 can be made either by rivet 40, as shown in FIG. figure 5 , or by crimping and deformation of a prominent part of a contact pad 50 inserted into the blade (s) 21 and the contact element 20, as illustrated on the figure 6 .
  • Another effective solution uses a screwing for the two variants considered above. In all cases the same rules as the second point concerning the first connecting element with the first part apply.
  • the contact element 20 may have a length of between 3 and 15 cm, a thickness in its first portion 22 of between 3 and 20 mm.
  • Each metal blade may have a thickness of between 0.1 mm and 1 mm.
  • the contact element 20 and the blades may be made of copper, aluminum or one of their alloys.

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  • Contacts (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Conductive Materials (AREA)

Description

DOMAINE TECHNIQUETECHNICAL AREA

L'invention concerne un dispositif de contact électrique de type doigt de contact à fort courant nominalThe invention relates to a contact contact type electric contact device with a high current rating

ÉTAT DE LA TECHNIQUE ANTÉRIEURESTATE OF THE PRIOR ART

Un premier exemple connu de réalisation d'un contact électrique de type doigt de contact entre une première pièce 10 et une seconde pièce 11 est illustré sur la figure 1. Le contact électrique est réalisé par un plot de contact 12 appliqué sur une surface conductrice de la seconde pièce 11 suivant une zone de contact 13, des lames métalliques 14 et une tige flexible 15. Ces lames qui sont reliées à un élément 16 de jonction mécanique et électrique à la première pièce 10 assurent le passage du courant entre le plot de contact 12 et cet élément 16. La tige flexible 15 assure une fonction ressort et permet de réaliser l'effort de contact sans assurer de passage de courant électrique.A first known example of making a contact-type electrical contact between a first part 10 and a second part 11 is illustrated in FIG. figure 1 . The electrical contact is made by a contact pad 12 applied on a conductive surface of the second piece 11 along a contact zone 13, metal strips 14 and a flexible rod 15. These blades which are connected to a mechanical joint element 16 and electrical to the first piece 10 ensure the passage of the current between the contact pad 12 and the element 16. The flexible rod 15 provides a spring function and allows to achieve the contact force without ensuring electrical current flow.

Un second exemple connu de réalisation d'un contact électrique de type doigt de contact consiste en un contact monobloc dont les trois fonctions de contact électrique, de passage de courant électrique et de ressort décrites ci-dessus sont réalisées en un seul élément obtenu par exemple par usinage ou par matriçage.A second known example of producing a contact-type electrical contact consists of a monoblock contact whose three functions of electrical contact, electrical current flow and spring described above are made in one element obtained for example by machining or stamping.

Ce second exemple constitue un mode de réalisation économique. Toutefois, une difficulté subsiste du fait du dimensionnement conjoint de la fonction passage de courant et de la fonction ressort. La fonction passage de courant implique un choix de matériaux ayant des propriétés conductrices satisfaisantes pour limiter les échauffements : typiquement du cuivre, de l'aluminium ou leurs alliages. Mais l'utilisation de tels matériaux pour assurer la fonction ressort entraîne des limites importantes concernant les dimensions de contact, notamment du fait des contraintes et de l'effort résultant, en particulier en raison d'une contrainte maximum à ne pas dépasser dans le matériau. Il en résulte que pour un encombrement donné, ce second exemple présente une valeur limite de courant nominal admissible.This second example constitutes an economic embodiment. However, a difficulty remains because of the joint dimensioning of the current flow function and the spring function. The current flow function involves a choice of materials having satisfactory conductive properties to limit heating: typically copper, aluminum or their alloys. But the use of such materials to ensure the spring function causes significant limits on the contact dimensions, especially because of the constraints and the resulting effort, in particular because of a maximum stress not to be exceeded in the material . It follows that for a given size, this second example has a limit value of nominal current.

L'invention a pour objet de modifier un tel contact monobloc, ou de conception proche d'un tel contact monobloc, pour augmenter le courant nominal dans un encombrement donné.The object of the invention is to modify such a monobloc contact, or design close to such a monobloc contact, to increase the nominal current in a given space.

Deux documents de l'art antérieur sont analysés ci-dessous.Two documents of the prior art are analyzed below.

US 1,776,138 décrit un doigt de contact électrique comportant un bras de contact mobile présentant une terminaison démontable à une de ses extrémités, son autre extrémité étant coudée et équipée pour pouvoir prendre un mouvement de rotation, ainsi qu'un ressort de déviation. US 1,776,138 discloses an electrical contact finger having a movable contact arm having a removable termination at one of its ends, its other end being bent and equipped to take a rotational movement, and a deflection spring.

US 2,636,955 décrit un coffret électrique du type comprenant des contacts sur un couvercle qui viennent s'accoupler à des contacts correspondants dans le coffret lorsque le couvercle est refermé sur le coffret, et des moyens de réception d'un fusible remplaçable dans le couvercle. US 2,636,955 discloses an electrical box of the type comprising contacts on a cover which mate with corresponding contacts in the box when the cover is closed on the box, and means for receiving a replaceable fuse in the cover.

EXPOSÉ DE L'INVENTIONSTATEMENT OF THE INVENTION

L'invention concerne un dispositif de contact électrique de type doigt de contact à fort courant nominal entre une première pièce qui est conductrice et une surface conductrice d'une seconde pièce, ce dispositif comprenant une tige flexible reliée à un premier élément de jonction mécanique et électrique à la première pièce, une partie de contact appliquée sur la surface conductrice de la seconde pièce et au moins une lame de contact métallique disposée à une première extrémité entre une première extrémité de la tige et la première pièce caractérisé en ce que la tige flexible est conductrice et en ce que la au moins une lame métallique est en sa seconde extrémité reliée à la seconde extrémité de la tige flexible à l'aide d'un second élément de jonction mécanique et électrique.The invention relates to a high-current contact-type electrical contact device with a high current between a first part which is conductive and a conductive surface of a second part, this device comprising a flexible rod connected to a first mechanical joining element and to the first piece, a contact portion applied to the conductive surface of the second piece and at least one metal contact blade disposed at a first end between a first end of the shank and the first piece characterized in that the flexible shank is conductive and in that the at least one metal blade is at its second end connected to the second end of the flexible rod with a second mechanical and electrical connection element.

Le premier élément de jonction peut comporter une vis ou un rivet. Le second élément de jonction peut comporter un rivet. Le second élément de jonction peut être réalisé par sertissage et déformation d'une partie proéminente d'un plot de contact. Le premier élément de jonction peut être relié à la première pièce par vissage. Dans un premier mode de réalisation la tige flexible et la partie de contact forment une même pièce. Avantageusement la tige flexible et la partie de contact sont réalisées en cuivre, en aluminium ou un de leurs alliages.The first joining element may comprise a screw or a rivet. The second joining element may comprise a rivet. The second joining element can be made by crimping and deformation of a prominent part of a contact pad. The first joining element can be connected to the first part by screwing. In a first embodiment, the flexible rod and the contact portion form a single piece. Advantageously, the flexible rod and the contact portion are made of copper, aluminum or one of their alloys.

Le dispositif de l'invention permet d'augmenter le courant nominal pour un encombrement donné.The device of the invention makes it possible to increase the nominal current for a given size.

BRÈVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

  • La figure 1 illustre un exemple de dispositif de contact de l'art connu.The figure 1 illustrates an example of a contact device of the prior art.
  • La figure 2 illustre un mode de réalisation du dispositif de l'invention. La figure 3 illustre un exemple de dispositif de contact, qui ne fait pas partie de l'invention.The figure 2 illustrates an embodiment of the device of the invention. The figure 3 illustrates an example of a contact device, which does not form part of the invention.
  • Les figures 4 à 6 illustrent des caractéristiques du dispositif tel qu'illustré sur les figures 2 et 3.The Figures 4 to 6 illustrate features of the device as illustrated in Figures 2 and 3 .
EXPOSÉ DÉTAILLÉ DE MODES DE RÉALISATION PARTICULIERSDETAILED PRESENTATION OF PARTICULAR EMBODIMENTS

Dans le dispositif , comme illustré sur les figures 2 et 3, un élément de contact allongé flexible conducteur 20, qui est le conducteur principal du courant électrique, assure une fonction ressort et une fonction plot de contact. Il peut être réalisé en une pièce, comme illustré sur la figure 2, ou en deux pièces, comme illustré sur la figure 3. Au moins une lame métallique 21 forme un complément de section pour le passage de courant électrique de façon à obtenir un doigt de structure simple dans un encombrement donné permettant le passage d'un maximum de courant nominal.In the device, as shown in the Figures 2 and 3 a conductive flexible elongate contact element 20, which is the main conductor of the electric current, provides a spring function and a contact pad function. It can be made in one piece, as illustrated on the figure 2 , or in two pieces, as shown on the figure 3 . At least one metal blade 21 forms a complement of section for the passage of electric current so as to obtain a simple structure of the finger in a given size allowing the passage of a maximum nominal current.

L'élément de contact 20 comprend une première partie 22 en forme de tige et une seconde partie 23 en forme de plot de contact qui peuvent faire partie d'une même pièce ou former deux pièces séparées. Une première extrémité de la au moins une lame 21 est disposée entre la première pièce 10 et la première extrémité de la première partie de la pièce conductrice 20, elle-même reliée à cette première pièce 10 par l'intermédiaire de l'élément de jonction 16. Une seconde extrémité de la au moins une lame 21 est reliée à la seconde extrémité de la première partie 22 de l'élément de contact 20 par un élément de jonction mécanique et électrique 24.The contact element 20 comprises a first portion 22 in the form of a rod and a second portion 23 in the form of contact pads which can be part of the same part or two separate parts. A first end of the at least one blade 21 is disposed between the first part 10 and the first end of the first part of the conductive part 20, itself connected to this first part 10 via the joining element 16. A second end of the at least one blade 21 is connected to the second end of the first portion 22 of the contact element 20 by a mechanical and electrical connecting element 24.

La au moins une lame de contact permet d'augmenter le courant nominal sans augmenter l'effort de contact.The at least one contact blade makes it possible to increase the nominal current without increasing the contact force.

La référence 25 représente la zone de contact entre la seconde partie 23 de l'élément de contact 20 et la surface conductrice 26 de la seconde pièce 11.The reference 25 represents the zone of contact between the second part 23 of the contact element 20 and the conductive surface 26 of the second part 11.

Les figures 4 à 6 illustrent des exemples de réalisation du premier et du second élément de jonction 16 et 24.The Figures 4 to 6 illustrate exemplary embodiments of the first and second joining members 16 and 24.

1. premier élément de jonction 16, illustré sur la figure 4 :1. first joining element 16, illustrated in FIG. 4:

Ce premier élément de jonction 16 peut être réalisé à l'aide d'une vis ou d'un rivet 30 reliant, l'élément de contact 20 et la ou les lames de contact 21 à la première pièce 10. Une seule liaison assure alors la jonction des trois éléments : première pièce 10, lames métalliques 21 et élément de contact 20.This first joining element 16 can be made using a screw or a rivet 30 connecting the contact element 20 and the contact blade or blades 21 to the first part 10. A single connection then ensures the junction of the three elements: first part 10, metal blades 21 and contact element 20.

Dans le cas d'un effort de serrage important, pour limiter la contrainte de pression dans les matériaux conducteurs et/ou disposer d'une surface de passage de courant satisfaisante, on peut utiliser une rondelle de répartition d'effort 31 disposée sous la tête de vis ou de rivet.In the case of a large clamping force, to limit the pressure stress in the conductive materials and / or have a satisfactory current flow area, one can use a force distribution washer 31 disposed under the head screw or rivet.

2. second élément de jonction 24, illustré sur les figures 5 et 6 :2. second joining element 24, illustrated in FIGS. 5 and 6:

La seconde jonction de la lame ou des lames 21 et de l'élément de contact 20 peut être faite soit par rivet 40, comme illustré sur la figure 5, soit par sertissage et déformation d'une partie proéminente d'un plot de contact 50 inséré dans la ou les lames 21 et l'élément de contact 20, comme illustré sur la figure 6. Une autre solution efficace utilise un vissage pour les deux variantes considérées ci-dessus. Dans tous les cas les mêmes règles que celle du second point concernant le premier élément de jonction avec la première pièce s'appliquent.The second junction of the blade or blades 21 and the contact element 20 can be made either by rivet 40, as shown in FIG. figure 5 , or by crimping and deformation of a prominent part of a contact pad 50 inserted into the blade (s) 21 and the contact element 20, as illustrated on the figure 6 . Another effective solution uses a screwing for the two variants considered above. In all cases the same rules as the second point concerning the first connecting element with the first part apply.

Dans un exemple de réalisation avantageux, l'élément de contact 20 peut avoir une longueur comprise entre 3 et 15 cm, une épaisseur dans sa première partie 22 comprise entre 3 et 20 mm. Chaque lame métallique peut avoir une épaisseur comprise entre 0,1 mm et 1 mm. L'élément de contact 20 et les lames peuvent être réalisés en cuivre, en aluminium ou un de leurs alliages.In an advantageous exemplary embodiment, the contact element 20 may have a length of between 3 and 15 cm, a thickness in its first portion 22 of between 3 and 20 mm. Each metal blade may have a thickness of between 0.1 mm and 1 mm. The contact element 20 and the blades may be made of copper, aluminum or one of their alloys.

Claims (6)

  1. An electrical contact device of the contact finger type for high nominal current between a first part (10) that is conductive and a conductive surface (26) of a second part (11), said device comprising a flexible rod (22) connected to a first connection element for mechanical and electrical connection to the first part (10), a contact portion (12) applied on the conductive surface of the second part (11), and at least one metal contact blade placed at a first end between a first end of the flexible rod (22) and the first part (10), the flexible rod (22) being conductive, the at least one metal blade (21) being connected at its second end to the second end of the flexible rod (22) by means of a second mechanical and electrical connection element (24), so that to form an additional section for passing a high nominal current, and characterized in that the flexible rod (22) and the contact portion (23) form a single piece.
  2. A device according to claim 1, in which the first connection element (16) comprises a screw or a rivet.
  3. A device according to claim 1, in which the second connection element (24) comprises a rivet.
  4. A device according to claim 1, in which the second connection element (24) is made by crimping and deforming a prominent portion of a contact pad (50).
  5. A device according to claim 3 or claim 4, in which the first connection element (16) is connected to the first part (10) by screw-fastening.
  6. A device according to claim 1, in which the flexible rod and the contact portion are made of copper, aluminum, or alloys thereof.
EP13767003.0A 2012-10-02 2013-09-30 Electrical contact device of the contact finger type with a strong nominal current Active EP2904623B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1259334A FR2996352B1 (en) 2012-10-02 2012-10-02 ELECTRIC CONTACT DEVICE OF CONTACT TYPE WITH STRONG CURRENT CURRENT
PCT/EP2013/070318 WO2014053429A1 (en) 2012-10-02 2013-09-30 Electrical contact device of the contact finger type with a strong nominal current

Publications (2)

Publication Number Publication Date
EP2904623A1 EP2904623A1 (en) 2015-08-12
EP2904623B1 true EP2904623B1 (en) 2016-07-13

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EP13767003.0A Active EP2904623B1 (en) 2012-10-02 2013-09-30 Electrical contact device of the contact finger type with a strong nominal current

Country Status (6)

Country Link
US (1) US9443666B2 (en)
EP (1) EP2904623B1 (en)
JP (1) JP2015536022A (en)
CN (1) CN104662631B (en)
FR (1) FR2996352B1 (en)
WO (1) WO2014053429A1 (en)

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FR2896335B1 (en) 2006-01-17 2008-11-14 Areva T & D Sa GENERATOR CIRCUIT BREAKER WITH INSERTED RESISTANCE
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FR2902923B1 (en) 2006-06-23 2008-09-19 Areva T & D Sa CYLINDRICAL CAM OPERATION OF A BREAKER ALTERNATOR DISCONNECTOR
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FR2951856A1 (en) 2009-10-26 2011-04-29 Areva T & D Sas METHOD AND DEVICE FOR COOLING A MEDIUM VOLTAGE ELECTRICAL INSTALLATION UNDER SINK
FR2951859B1 (en) 2009-10-26 2012-12-21 Areva T & D Sas METHOD FOR COOLING IN INTEGRATED COILS OF A MEDIUM VOLTAGE ELECTRICAL APPARATUS AND SYSTEM USING THE SAME
FR2951858B1 (en) 2009-10-26 2011-12-23 Areva T & D Sas DEVICE FOR COOLING A MEDIUM VOLTAGE APPARATUS USING ISOLATED CALODUCES
CN201788835U (en) * 2010-03-16 2011-04-06 黄道铭 Six-pin switch contact bridge
FR2985081B1 (en) 2011-12-21 2015-03-06 Alstom Technology Ltd DEVICE FOR PROTECTION AGAINST PARTICLES GENERATED BY AN ELECTRIC SWITCHING ARC

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US9443666B2 (en) 2016-09-13
CN104662631B (en) 2017-08-08
FR2996352B1 (en) 2014-10-31
FR2996352A1 (en) 2014-04-04
CN104662631A (en) 2015-05-27
JP2015536022A (en) 2015-12-17
EP2904623A1 (en) 2015-08-12
WO2014053429A1 (en) 2014-04-10
US20150235781A1 (en) 2015-08-20

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