EP1366549A1 - Dispositif pour connecter et mettre a la terre des composants de cadre de tableaux de controle - Google Patents

Dispositif pour connecter et mettre a la terre des composants de cadre de tableaux de controle

Info

Publication number
EP1366549A1
EP1366549A1 EP02724235A EP02724235A EP1366549A1 EP 1366549 A1 EP1366549 A1 EP 1366549A1 EP 02724235 A EP02724235 A EP 02724235A EP 02724235 A EP02724235 A EP 02724235A EP 1366549 A1 EP1366549 A1 EP 1366549A1
Authority
EP
European Patent Office
Prior art keywords
conducting
joint
wall
frame
ground
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.)
Withdrawn
Application number
EP02724235A
Other languages
German (de)
English (en)
Inventor
Cristian Cagliani
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.)
ABB SpA
Original Assignee
ABB Service SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Service SRL filed Critical ABB Service SRL
Publication of EP1366549A1 publication Critical patent/EP1366549A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/01—Frameworks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/01—Frameworks
    • H02B1/014—Corner connections for frameworks

Definitions

  • the present invention relates to a device for connecting and grounding components of a frame for a cabinet of an electrical switchboard.
  • cabinets for low- voltage electrical switchboards are produced by using a parallelepipedal frame inside which there is an adequate space suitable to accommodate the components of the switchboard, for example circuit breakers, bus bars, cable raceways, supporting guides; the frame furthermore constitutes a structural skeleton to which the elements for supporting said components are functionally anchored together with the cladding panels, the top, the base, the door of said cabinet, et cetera.
  • These frames are generally produced by means of a plurality of metallic components and in particular provide a lower end and an upper end, which are mutually connected by using vertical profiled elements or uprights.
  • the ends can be formed by multiple mutually connected parts; for example, according to a modular embodiment that is widely used in the art, each end is constituted by four corner elements, known in the art as multidirectional corner joints, which are mutually connected in pairs by virtue of profiled elements arranged substantially horizontally or cross-members.
  • a frame for an electrical switchboard cabinet is described for example in the European patent application no. 98201165.
  • the cabinet is therefore placed so that its lower end rests on a metallic footing, which is generally fixed to the floor; in this manner, in addition to obtaining a lower compartment for the accommodation and passage of the switchboard wiring cables, the contact between the metallic parts of the footing and those of the lower end, and more particularly between the footing and the corners joints, each of which has a suitable resting surface, allows to electrically connect to the ground the structure of the frame as well as the other electrically conducting parts of the cabinet that are operatively connected thereto.
  • known types of frame despite performing adequately the functions they are normally required to provide, have drawbacks and disadvantages.
  • the fact that the corner joints are made of metallic material, for example a metal alloy based on zinc and aluminum, despite allowing, by virtue of contact with the footing, to connect the frame electrically to the ground directly without using other components, has a significant effect on production costs; furthermore, the overall weight of the frame is also increased considerably, and this entails an increase in difficulties during assembly and installation of the cabinet.
  • the aim of the present invention is to provide a device for connecting and grounding components of a frame of a cabinet for an electrical switchboard that allows to obviate the above cited drawbacks and in particular allows to reduce production costs, reduce frame weights, and at the same time ensure optimum functional performance.
  • a device for connecting and grounding components of a frame of a cabinet for an electrical switchboard comprising a corner joint meant to be placed at a corner of the frame and provided with a body that has at least first, second and third walls from which three corresponding contoured arms protrude in three substantially mutually perpendicular directions, said arms being suitable to be connected respectively to first, second and third structural components of the frame, said first, second and third structural components being made of electrically conducting material, characterized in that said corner joint is made of electrically insulating material and in that it comprises conducting means which have at least one conducting surface that is suitable to make contact with said first, and/or second and/or third structural components and allow their electrical connection to the ground.
  • the device according to the invention thus allows to reduce significantly, with respect to the known art, the cost of corner joints and therefore of the entire frame, at the same time reducing the overall weight of the structure and ensuring in any case optimum functional performance and in particular the adequate grounding of said frame.
  • Figure 1 is a perspective view of a corner joint used in the device according to the invention
  • Figure 2 is a partial view of a constructive detail of the joint of Figure 1 ;
  • Figure 3 is a perspective view of a possible embodiment of conducting means that can be used in the device according to the invention.
  • Figure 4 is a perspective view of the joint of Figure 1, connected to the conducting means of Figure 2;
  • Figure 5 is a perspective view of the joint of Figure 1, connected to conducting means according to a second embodiment;
  • Figure 6 is a view of the device according to the invention, connected to additional components of the frame.
  • the device according to the invention comprises a comer joint 1, advantageously made of electrically insulating material, and conducting means that have at least one conducting surface suitable to make contact with at least one of the structural components of the frame that are connected to said joint 1 and to facilitate their electrical connection to the ground, as described in greater detail hereinafter.
  • the corner joint 1 is made of thermoplastic material, for example nylon, loaded with reinforcement material, for example mineral fibers, preferably glass fibers; in this manner, the corner joint 1, in addition to ensuring electrical insulation, also has a suitable structural strength.
  • the joint 1 can be made of another insulating material, for example thermosetting material, and/or loaded with other reinforcement material, so long as this is done in a manner that is compatible with the applications.
  • the corner joint 1 has a contoured body that has at least a first wall 2, a second wall 3 and a third wall 4, which are substantially flat and from which three corresponding contoured arms, designated by the reference numerals 5, 6 and 7 respectively, protrude in three substantially mutually perpendicular directions.
  • the arms 5, 6 and 7 have mutually identical contoured profiles and have threaded holes 13 so that each one is connected, by virtue of common fixing means, to a corresponding structural component of the frame during the assembly of said frame.
  • Said structural components, shown partially in Figure 6, are generally constituted by profiled elements made of electrically conducting material, for example folded metal plate, and constitute a upright of the frame, designated by the reference numeral 40, and two cross-members 41 and 42.
  • the joint 1 has a fourth wall 8, which is substantially parallel to the first wall 2 and on which there is a threaded hole 9; proximate to the threaded hole 9 there is also a protrusion 10 that has a curvilinear profile, protrudes from said fourth wall 8 substantially at right angles thereto and on the opposite side with respect to the arm 5, and is suitable to couple, by virtue of fixing means, to a portion of a metal panel, which is shown partially in cross-section in Figure 6 and is designated by the reference numeral 43. Said panel 43, depending on whether the corner joint 1 is part of the lower or upper end of the frame, constitutes the top or bottom of the cabinet. Finally, as shown in Figure 2, a hollow seat 11 is formed in the first wall 2.
  • the conducting means preferably comprise a substantially elastic body 20 made of electrically conducting material which has a first end portion 21, a second end portion 24 and a third intermediate portion 25 that structurally interconnects the two end portions 21 and 24.
  • the first end portion 21 is substantially flat, with a first part shaped so as to have straight edges and a second part, contiguous to the first one, which has a curvilinear edge; a curvilinear slot 22 and a hole 23 are formed in said end portion 21.
  • both the contour of the end 21 and the arrangement and/or shape of the slot 22 and of the hole 23 provided thereon can be changed appropriately according to the applications.
  • the intermediate portion 25 has an L-shaped rod-like body, which has a longer side that lies longitudinally substantially at right angles to the central plane of the end 21 and a short side that is parallel thereto; in particular, the rodlike body comprises two contiguous walls that are arranged with respect to each other so as to form a dihedral angle.
  • the second end portion 24 has a substantially L-shaped contour, with a first short side that protrudes from the short side of the intermediate portion 25 in a direction that is parallel to the central plane of the end 21 and a long side that protrudes toward said end 21 and at right angles thereto.
  • the conducting means comprise a contoured conducting lamina 30, which is suitable to be fixed to the body of the corner joint 1, for example by gluing or by using screws or rivets or other known techniques.
  • the lamina 30 is made of metal and has a first conducting surface 31, a second conducting surface 32, and a third conducting surface 33, which are arranged respectively on the first wall 2, on the second wall 3 and on the third wall 4 and are suitable to make contact with the corresponding structural components 40, 41 and 42 connected to the joint 1.
  • the metallic lamina 30 is shaped so as to have a fourth surface 34, which is arranged on the wall 8 around the protrusion 10 and is suitable to make contact with the panel 43.
  • the conducting lamina 30 might be obtained by means of a surface treatment of a portion of the joint 1, for example by metallization, by depositing a layer of metallic material; or the joint might be partially coated with a layer of conducting material, for example graphite.
  • the conducting means can be provided by means of a conducting insert, preferably a metallic insert, which is embedded directly in the body of the joint, for example by means of an overmolding process, leaving some parts of the insert superficially exposed at the walls 2, 3, 4 and 8, so that they make contact with the corresponding surfaces of the components of the frame and facilitate electrical contact with the footing.
  • the conducting elastic body 20 is connected to the joint 1, arranging it so that the end 21 rests on the fourth wall 8 so that the slot 22 accommodates the protrusion 10 and the hole 23 substantially overlaps the threaded hole 9; in turn, the longer side of the intermediate portion 25 is arranged along an edge that is shared between the second wall 3 and the third wall 4, while the end 24 is arranged so that a first side of the L-shape rests on the first wall 2 and the second side is inserted in the hollow seat 11; in this manner, the conducting body 20, by virtue of its shape and elasticity, is connected to the joint 1 without adding further fixing elements.
  • the upright 40 and the cross-members 41 and 42 are then connected to the device thus obtained so as to provide the frame; in particular, both for the lower end and for the upper end of the frame it is possible and preferable to use four devices according to the invention, with the corresponding joints arranged at the corners of the frame.
  • four devices according to the invention with the corresponding joints arranged at the corners of the frame.
  • both the upright 40 and the cross-members 41 and 42 are each fitted on a corresponding arm and are fixed by means of screws inserted in the threaded holes 13 so as at least one conducting surface of the elastic body 20 makes contact with said first, and/or said second and/or said third stmctural components and allow their electrical connection to ground.
  • the elastic body 20 contacts at the same time all the three stmctural components and connect them to ground; in fact, in this case one end of the two cross-members 41 and 42 makes direct contact with two corresponding surfaces of the intermediate portion 25, while the end of the upright 40 makes contact with the part of the end 24 that rests on the wall 2; then the metallic panel 43 is fixed to the joint 1, for example by means of a screw 51, so that part of the panel is therefore in contact with the end 21 of the elastic body 20.
  • the cabinet is arranged on a metal footing (not shown), which is generally fixed to a floor, so that the joints of the lower end rest thereon.
  • the elastic body 20 by virtue of the contact between its various surfaces and the corresponding contact surfaces of the upright 40, of the cross- members 41-42, of the panel 43 and of the footing, and also by virtue of the screw 51, allows to have electrical continuity between the frame and the footing and thus facilitates electrical connection to the ground of the components of said frame.
  • the device according to the invention fully achieves the intended aim, since it allows to reduce considerably the overall costs and weights of the frame, ensuring at the same time in an optimum manner the required functional performance.
  • both the necessary structural rigidity and most of all the grounding of the structure are achieved with a constructive solution that is extremely simple and at the same time effective.
  • the device thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the inventive concept; it would be possible, for example, to use two or more conducting elements that allow to provide separately the electrical connection to the ground of the various components of the frame, bypassing the joint or not. All the details may furthermore be replaced with other technically equivalent elements.
  • the materials used, as well as the contingent shapes and dimensions may be any according to the requirements and the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Patch Boards (AREA)

Abstract

L'invention concerne un dispositif permettant la connexion et la mise à la terre de composants d'un cadre d'armoire pour tableau de contrôle électrique, comprenant un joint d'angle conçu pour être placé dans un angle du cadre et doté d'au moins des première, deuxième et troisième parois desquelles saillent trois bras profilés correspondant dans trois directions sensiblement perpendiculaires les unes par rapport aux autres. Lesdits bras conviennent à la connexion, respectivement aux premier, deuxième et troisième composants structuraux du cadre, composants constitués de matériau électroconducteur. Plus spécifiquement, le joint d'angle est en matériau électroconducteur et comporte des moyens conducteurs possédant au moins une surface conductrice conçue pour faire contact avec les premier, deuxième et troisième composants structuraux et faciliter leur connexion électrique à la terre.
EP02724235A 2001-03-09 2002-03-07 Dispositif pour connecter et mettre a la terre des composants de cadre de tableaux de controle Withdrawn EP1366549A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI20010505 2001-03-09
ITMI20010505 ITMI20010505A1 (it) 2001-03-09 2001-03-09 Dispositivo per la giunzione e messa a terra di componenti di una intelaiatura per un armadio di quadro elettrico
PCT/EP2002/002859 WO2002073761A1 (fr) 2001-03-09 2002-03-07 Dispositif pour connecter et mettre a la terre des composants de cadre de tableaux de controle

Publications (1)

Publication Number Publication Date
EP1366549A1 true EP1366549A1 (fr) 2003-12-03

Family

ID=11447211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02724235A Withdrawn EP1366549A1 (fr) 2001-03-09 2002-03-07 Dispositif pour connecter et mettre a la terre des composants de cadre de tableaux de controle

Country Status (3)

Country Link
EP (1) EP1366549A1 (fr)
IT (1) ITMI20010505A1 (fr)
WO (1) WO2002073761A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110279227A (zh) * 2019-07-01 2019-09-27 贵州锦程铝业科技有限公司 一种铝合金型材柜体

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20050898A1 (it) * 2005-05-17 2006-11-18 Bticino Spa Armadio di quadro elettrico
TR201007656A2 (tr) 2010-09-20 2012-04-24 Kiraç Metal Ürünleri̇ San. Ve Ti̇c. Ltd. Şti̇ Elektrik panosu yapılarında yenilik
CN102143668A (zh) * 2010-12-31 2011-08-03 华为技术有限公司 机柜拼装装置及连接件

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5298681A (en) * 1992-04-20 1994-03-29 Xerox Corporation Frame member and assembly for carrying electrical signals and the like
FR2783642B1 (fr) * 1998-09-21 2000-12-01 Schneider Electric Sa Structure metallique a piece d'assemblage et de liaison electrique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02073761A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110279227A (zh) * 2019-07-01 2019-09-27 贵州锦程铝业科技有限公司 一种铝合金型材柜体

Also Published As

Publication number Publication date
ITMI20010505A1 (it) 2002-09-09
WO2002073761A1 (fr) 2002-09-19

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