WO2013087097A1 - Commutateur électrique agencé pour un remplacement efficace de contact - Google Patents

Commutateur électrique agencé pour un remplacement efficace de contact Download PDF

Info

Publication number
WO2013087097A1
WO2013087097A1 PCT/EP2011/072674 EP2011072674W WO2013087097A1 WO 2013087097 A1 WO2013087097 A1 WO 2013087097A1 EP 2011072674 W EP2011072674 W EP 2011072674W WO 2013087097 A1 WO2013087097 A1 WO 2013087097A1
Authority
WO
WIPO (PCT)
Prior art keywords
carrier
movable contact
actuator
electrical switch
actuator device
Prior art date
Application number
PCT/EP2011/072674
Other languages
English (en)
Inventor
Prashant KUBAL
Noah Ramrajkar
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to BR112014014047A priority Critical patent/BR112014014047A2/pt
Priority to EP11797233.1A priority patent/EP2729952B1/fr
Priority to CN201180074138.0A priority patent/CN103858198B/zh
Priority to PCT/EP2011/072674 priority patent/WO2013087097A1/fr
Publication of WO2013087097A1 publication Critical patent/WO2013087097A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/546—Contact arrangements for contactors having bridging contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2008—Facilitate mounting or replacing contact bridge and pressure spring on carrier

Definitions

  • the present invention relates to an electrical switch used for opening and closing an electrically conductive path between an electric supply and an electric load.
  • the present invention relates to an electrical switch adapted for facilitating efficient contact
  • each movable contact includes an electrically conductive elongated rigid sheet with contact pads mounted on opposite ends thereof such that each movable contact may engage a corresponding set of stationary contacts in a bridge-like manner.
  • the supply-side and load-side stationary contacts are connected to an
  • Such electrical switches may be either manually or electrically actuated.
  • an actuating assembly is provided to cause
  • the electrical switches may be classified as normally-open and normally-closed type electrical switches.
  • normally-open electrical switches the actuating assembly displaces the movable contacts from an open position to a closed position.
  • various biasing means return the movable contacts back to an open position, and thereby, interrupting the electrically conductive path. The operation is reversed in case of a normally-closed electrical switch.
  • a movable contact assembly includes a movable contact suitably mounted in an insulating carrier using a holder element in conjunction with suitable biasing means.
  • the biasing means are such that not only the movable contact is efficiently retained in the insulating carrier but sufficient contact pressure between the movable contact and the corresponding pair of stationary contacts is also generated in the closed position .
  • the contact-pressure spring is disposed on one side of said bridging contact structure to bias said spring support against said damping spring, and thereby, to bias said damping spring on the opposite side of said
  • insulating contact carrier is displaced from an open position to a closed position. During this displacement, after said bridging contact structure engages corresponding spaced stationary contacts, said contact carrier moves an additional distance whereby said contact pressure spring is charged to operate through said spring support and damping spring to provide contact pressure between said spaced stationary contacts and said bridging contact structure. It is well known in the art that due to various mechanical and electrical factors, such as contact bounce, electrical arc formation, and so on, a movable contact is prone to mechanical wear, and hence, it is required to replace the movable contacts from time-to-time during routine maintenance of the electrical switch.
  • the size of the electrical switch is based on an electrical rating of the electrical switch, that is, magnitude of an operating current and/or an operating voltage that the electrical switch is anticipated to be subjected to during its operation. This follows from the fact that an increase in the current carrying capacity of an electrical switch
  • the movable contact assembly With increasing electrical ratings, the movable contact assembly as well as various components included therein tend to become quite large. Thus, as the electrical rating of the electrical switch progressively increases, the resilient means, such as compression springs, used in the movable contact assembly must be progressively configured to provide the increased contact force between abutting movable and stationary contacts.
  • the movable contacts are inspected for mechanical wear and when necessary, are replaced.
  • the patent discloses a movable contact structure for a large- sized electrical switch.
  • the contact structure includes a movable contact retainer that has apertured ears and the base of the switch which supports the stationary contacts includes support posts, which, when the switch is disassembled to inspect the contacts, are available to act as a fulcrum for the shank of a screwdriver when the tip of the screwdriver is inserted into the apertures.
  • the screwdriver thus may be used as a tool to overcome the spring forces holding the movable contact retainer and thus facilitate the removal and
  • the disclosed electrical switch provides means for facilitating movable contact replacement. However, it fails to provide desired ease and efficiency.
  • an electrical switch such as an electrical
  • an electrical switch adapted for facilitating contact replacement.
  • the electrical switch comprises at least one pair of stationary contacts and at least one movable contact assembly.
  • the at least one movable contact assembly is displaceable relative to the at least one pair of stationary contacts to interrupt and establish an electrically-conductive path between the pair of stationary contacts.
  • the at least one movable contact assembly comprises a movable contact, a carrier, a holder element, and biasing means.
  • the carrier is an elongated insulating structure which comprises a head-end, a base-end, a first socket extending from the base-end along a substantially longitudinal axis, and a second socket along a substantially transverse axis intermediate the head and the base ends such that the first socket is in continuum with the second socket.
  • the holder element is adapted for being movably inserted inside the first socket through the base-end, and further adapted for receiving the movable contact through the second socket.
  • the biasing means bias the holder element towards the base-end of the carrier such that the movable contact is supported inside the carrier.
  • the carrier comprises carrier coupling means for coupling to an actuator device.
  • the actuator device is operable to displace the holder element relative to the carrier along a direction extending from the base-end towards the head-end against a biasing force exerted by the biasing means .
  • the present invention greatly facilitates replacement of movable contacts in electrical switches.
  • the actuator device is operated to overcome the biasing force exerted by the biasing means and hence, release an existing movable contact and install a new movable contact therein.
  • the carrier is provided with retaining means for retaining a first end of the biasing means.
  • the holder element comprises a head-end and a base-end.
  • the head-end is adapted to pass through the retaining means.
  • the base-end is adapted to engage a second end of the biasing means.
  • the electrical switch further comprises resilient means.
  • the resilient means are disposed intermediate the head-end of the holder element and the movable contact such that the head-end of the holder is biased against the
  • the actuator device comprises an actuator arm and actuator coupling means.
  • the actuator arm is linearly
  • the actuator coupling means facilitate mounting the actuator device on the carrier such that the actuator arm is operable to engage the holder element.
  • the actuator device comprises a base structure, an actuator arm, and actuator coupling means.
  • the actuator arm is rotatably engaged in the base structure such that the actuator arm is linearly displaceable along the longitudinal axis of the carrier through rotation of the actuator arm about the longitudinal axis of the carrier.
  • the actuator coupling means facilitate mounting the actuator device relative on the carrier such that the actuator arm is operable to engage the holder element.
  • the carrier coupling means are one of a groove, a ridge, lateral projections, internal threads, external threads.
  • the actuator coupling means correspond to the carrier coupling means such that the actuator coupling means are suitable for removably engaging the carrier coupling means.
  • actuator device is fixedly mounted on the carrier.
  • the actuator device is one of a mechanical actuator device, an electromechanical actuator device, a hydraulic actuator device, and a pneumatic actuator device. This technical feature ensures that the present invention is implementable using a variety of actuator devices capable of providing linear displacement.
  • FIGS 1A-1B illustrate a three-phase electrical switch in accordance with an embodiment of the present invention
  • FIGS 2A-2D illustrate a perspective view, a first partially exploded view, a second partially-exploded view, and a cross-sectional view respectively of a set of movable contact assemblies in accordance with an embodiment of the present invention
  • FIGS 3A-3E illustrate a perspective view, a side-view, a front view, a first cross-sectional view, and a second cross-sectional view of a set of movable contact assemblies and an actuator device in accordance with an embodiment of the present invention .
  • FIGS 3A-3E illustrate a perspective view, a side-view, a front view, a first cross-sectional view, and a second cross-sectional view of a set of movable contact assemblies and an actuator device in accordance with an embodiment of the present invention .
  • FIGS 1A and IB illustrate a three-phase electrical switch 100 in accordance with the present invention.
  • FIG 1A illustrates a perspective view of the electrical switch 100
  • FIG IB illustrates a cross-sectional view of the electrical switch 100 along I-I'.
  • the electrical switch 100 includes a housing structure 102, three pairs of stationary contacts 104, and corresponding three movable contact
  • Each movable contact assembly 106 includes a movable contact 108.
  • Each stationary contact 104 is connected to a terminal plate 110.
  • the housing structure 102 encloses the stationary contacts 104 and a part of the movable contact assembly 106.
  • the housing structure 102 has a box-like construction.
  • the housing structure 102 provides insulating partitions (not shown) between the pair of stationary contacts 104 and the terminal plates 110 corresponding to different phases.
  • Each pair of stationary contacts 104 includes supply-side stationary contacts such as stationary contact 104a and load- side stationary contacts, such as stationary contact 104a' .
  • the supply-side and the load-side stationary contacts 104a-a' are disposed on either side of the movable contact assembly 106.
  • the supply-side and the load-side stationary contacts 104a-a' are connected to the input and output terminal plates 110, which are, in turn connected to an electrical supply and an electrical load respectively.
  • Each movable contact assembly 106 is displaceable relative to the corresponding pair of stationary contacts 104 such that when the movable contact 108 is in contact with the pair of stationary contacts 104, an electrically conductive path is established between the electrical supply and the electrical load; and when the movable contact 108 is not in contact with the pair of stationary contacts 104, an electrically
  • conductive path is interrupted between the electrical supply and the electrical load.
  • FIGS 2A-2D illustrate a perspective view, a first partially exploded view, a second partially-exploded view, and a cross- sectional view respectively of the movable contact assemblies 106 in accordance with an embodiment of the present
  • FIGS 2A through 2D show three movable assemblies 106 which are integrally connected.
  • Each movable contact assembly 106 includes a movable contact 202, a carrier 204, a holder element 206, biasing means 208, and resilient means 210.
  • the carrier 204 includes a first socket 212, a second socket 214, retaining means 216, carrier coupling means 218.
  • one or more movable contact assemblies also include engaging means 220.
  • the movable contact 202 is same as the movable contact 108.
  • Each movable contact 202 includes an elongated flat conductor with a pair of contact pads attached to ends thereof, such that the movable contact 202 establishes an electrically conductive path between stationary contacts 104 in a bridgelike manner in a closed position of the electrical switch 100.
  • the movable contact 202 is provided with resilient means 210, on the side opposite to the side containing the contact pads, as shown in the adjoining figures. In the exemplary embodiment shown in the adjoining figures, the resilient means 210 are embodied in a leaf-spring.
  • the carrier 204 is an elongated insulating structure.
  • the carrier 204 includes a head-end 204a and a base-end 204b.
  • the first socket 212 extends from the base-end 204b along a substantially longitudinal axis towards head-end 204a.
  • the second socket 214 extends along a substantially transverse axis intermediate the head and the base ends 204a and 204b.
  • the first socket 212 is in continuum with the second socket 214.
  • the carrier 204 includes three distinct portions - a first (I) portion, a second (II) portion, and an optional third (III) portion.
  • the first portion is tubular with a rectangular cross-section.
  • the second portion is substantially inverted U-shaped such that the two arms thereof are interface with the first portion.
  • the third portion extends from the base of the inverted U- shaped second portion, and is provided with the engaging means 220 at an end thereof.
  • the tubular cavity within the first portion forms the first socket 212
  • the inverted U-shaped second portion along with an interfacing region of the first portion form the second socket 214.
  • the first and the second sockets 212, 214 are in continuum. It should be noted that this example has been provided only for exemplary purpose and in various embodiments of the present invention, any suitable design and construction of the carrier 204 may be used.
  • the first socket 212 is provided with retaining means 216 for engaging a first end of the biasing means 208.
  • the retaining means 216 may be embodied in any form of inward projections so long as a head-end 206a of the holder element 206 may pass through the retaining means 216 while the biasing means 208 are engaged therewith (as will be further understood in
  • the retaining means 216 are formed as horizontal ledges projecting inwards in opposite directions from inner walls of the first socket 212 while maintaining such space there-between that the head-end 206a of the holder 206 may pass there-through.
  • the holder element 206 is adapted for being movably inserted inside the first socket 212 through the base-end 204b.
  • the head-end 206a of the holder element 206 is adapted for receiving the movable contact 202 through the second socket 214.
  • the holder element 206 is configured for engaging, at the base-end 206b, a second end of the biasing means 208.
  • the biasing means 208 provide a biasing force to bias the holder element 206 towards the base-end 204b of the carrier 204.
  • the biasing means 208 are embodied in a compression spring.
  • the biasing means 208 such as a compression spring, is installed inside the holder element 206 such that the first end of the biasing means 208 engages the head-end 206a and the second end of the biasing means 208 engages the base-end 206b.
  • a driving force is applied on the holder element 206 to insert the holder element 206 inside the first socket 212.
  • the first end of the biasing means 208 is engaged in the retaining means 216.
  • the head-end 206a moves beyond the retaining means 216 and eventually reaches the second portion in the carrier 204.
  • the movable contact 202 When the holder element 206 has moved sufficiently inside the first and the second sockets 212, 214, the movable contact 202, along with the resilient means 210, is installed inside the holder element 206, as best depicted in FIG 2B. Finally, the driving force inserting the holder element 206 inside the carrier 204 is removed .
  • the biasing force provided by the biasing means 208 bias the holder element 206 towards the base-end 204b of the carrier 204.
  • the head-end 206a of the holder 206 acts on the
  • At least one carrier 204 also includes engaging means 220 for engaging the carrier 204 with an actuating assembly (not shown) for displacing the movable contact assembly 106 to a first and a second position to respectively interrupt and establish an electrically conductive path between the
  • the carrier 204 includes carrier coupling means 218 for coupling to an actuator device (not shown) substantially near the base-end 204b. This will now be described in detail in conjunction with FIGS 3A through 3C.
  • FIGS 3A-3E illustrate a perspective view, a side-view, a front view, a first cross-sectional view, and a second cross- sectional view of a set of movable contact assemblies 106 and an actuator device 300 in accordance with an embodiment of the present invention.
  • an actuator device 300 is used along with the movable contact assemblies 106.
  • the actuator device 300 includes a base structure 302, an
  • the actuator device 300 is adapted to be coupled to the movable contact assembly 106 through engagement of the carrier coupling means 218 and the actuator coupling means 306.
  • the base structure 302 is firmly held in a fixed spatial relationship with respect to the carrier 204 such that the actuator arm 304 is operable to engage the holder element 206.
  • actuator arm 304 is linearly displaceable along the
  • actuator devices 300 that may be used in accordance with the present invention include, but are not limited to, a mechanical actuator device, an
  • Each of these actuator devices 300 is characterised by its ability to cause linear displacement.
  • Such actuator devices are well known in the art and hence, a detailed description is not being provided.
  • the actuator device 300 is a mechanical actuator.
  • the actuator arm 304 is rotatably engaged in the base structure 302 such that the actuator arm 304 is linearly displaceable along the longitudinal axis of the carrier 204 through rotation of the actuator arm 304 about the
  • the actuator arm may be a simple screw or an L-shaped device with external threads on one leg engaging the base structure 302 and the second leg assisting in rotating the actuator arm 304 about the longitudinal axis of the carrier 204.
  • the carrier coupling means 218 may be implemented in any suitable manner such as a groove, a ridge, lateral
  • the actuator coupling means 306 provided on the actuator device 300 correspond to the carrier coupling means 218 such that the actuator coupling means 306 are suitable for removably engaging the carrier coupling means 218 so that the actuator device 300 may be fixedly mounted on the carrier 204.
  • the actuator device 300 is mounted on the movable contact assembly 106 in the manner depicted in FIG 3D.
  • the actuator arm 304 is operated to engage the base-end 206b of the holder element 206.
  • the actuator arm 304 is operated further to displace the holder element 206 relative to the carrier 204 along a direction extending from the base-end 204b towards the head-end 204a against the biasing force exerted by the biasing means 208, as depicted in FIG 3E .
  • the holder element 206 is moved to such position towards the head-end 204a of the carrier 204 that the movable contact 202 is easily released. Thereafter, a new movable contact 202 is
  • the actuator device 300 is released.
  • the actuator arm 304 is rotated in reverse direction and the carrier coupling means 218 and the actuator coupling means 306 are disengaged.
  • the holder element 206 moves towards the base- end 204b of the carrier 204 due to the biasing force exerted by the biasing means 208 such that the new movable contact 202 is firmly supported inside the carrier 204.
  • an actuator device 300 is detachably coupled to a movable contact assembly 106 wherein replacement of a movable contact is desired. Therefore, only a single actuator device 300 may be used to carry out maintenance activities for multiple electrical switches.
  • an actuator device 300 may be detachably coupled to a movable contact assembly 106 wherein replacement of a movable contact is desired. Therefore, only a single actuator device 300 may be used to carry out maintenance activities for multiple electrical switches.
  • individual actuator device 300 is mounted on each movable contact assembly 106 as an integral component thereof.
  • the design and construction of the movable contact assembly is exemplary in nature and should not be construed to limit the scope of the present invention.
  • the present invention is equally applicable to various different designs of the movable contact assembly.
  • the actuator device 300 is required to generate a x push' force in case of the movable contact assembly 106 described above.
  • the actuator device 300 may produce a ⁇ ull' force to achieve the same effect in terms of releasing the existing movable contact 108 and installing a new movable contact 108 therein.
  • the techniques of the present invention are most useful when working with large-sized electrical switches, it should be noted that the present invention may be employed in electrical switches of any size whatsoever as may be required.
  • the electrical switch in accordance with the present invention is advantageously adapted for contact replacement.
  • the present invention obviates the difficulties arising due to application of force on the holder element with bare hands.
  • the techniques of the present invention are highly efficient and convenient as compared to various clumsy and cumbersome procedures

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Push-Button Switches (AREA)
  • Contacts (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

L'invention concerne un commutateur électrique agencé pour un remplacement efficace de contact. La présente invention comprend un commutateur électrique (100) agencé pour faciliter le remplacement de contact (108, 202). Le commutateur électrique (100) contient au moins une paire de contacts stationnaires (104) et au moins un ensemble contact mobile (106). Chaque assemblage de contact mobile (106) contient un contact mobile (108, 202), un support (204) pour supporter le contact mobile (108, 202), un élément de maintien (206) inséré de manière mobile à l'intérieur de la première prise femelle (212) pour maintenir le contact mobile (108, 202), et des moyens de sollicitation (208) pour solliciter l'élément de maintien (206) en direction d'une extrémité de base (204b) du support (204). Le support (204) contient en outre des moyens de couplage de support (218) pour un couplage à un dispositif d'actionneur (300) de telle sorte que le dispositif d'actionneur (300) est actionnable pour déplacer l'élément de maintien (206) par rapport au support (204) à l'encontre d'une force de sollicitation exercée par les moyens de sollicitation (208).
PCT/EP2011/072674 2011-12-14 2011-12-14 Commutateur électrique agencé pour un remplacement efficace de contact WO2013087097A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BR112014014047A BR112014014047A2 (pt) 2011-12-14 2011-12-14 chave elétrica adaptada para facilitar substituição de contato
EP11797233.1A EP2729952B1 (fr) 2011-12-14 2011-12-14 Commutateur électrique agencé pour un remplacement efficace de contact
CN201180074138.0A CN103858198B (zh) 2011-12-14 2011-12-14 适于有效替换接触件的电气开关
PCT/EP2011/072674 WO2013087097A1 (fr) 2011-12-14 2011-12-14 Commutateur électrique agencé pour un remplacement efficace de contact

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/072674 WO2013087097A1 (fr) 2011-12-14 2011-12-14 Commutateur électrique agencé pour un remplacement efficace de contact

Publications (1)

Publication Number Publication Date
WO2013087097A1 true WO2013087097A1 (fr) 2013-06-20

Family

ID=45350763

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/072674 WO2013087097A1 (fr) 2011-12-14 2011-12-14 Commutateur électrique agencé pour un remplacement efficace de contact

Country Status (4)

Country Link
EP (1) EP2729952B1 (fr)
CN (1) CN103858198B (fr)
BR (1) BR112014014047A2 (fr)
WO (1) WO2013087097A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021128179A1 (de) 2021-10-28 2023-05-04 Te Connectivity Germany Gmbh Schaltkontaktbaugruppe für ein elektrisches Schaltelement und elektrisches Schaltelement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3602850A (en) 1969-08-27 1971-08-31 Westinghouse Electric Corp Contactor with improved contact support means and guide means
US3646491A (en) 1970-12-18 1972-02-29 Square D Co Movable contact structure for an electric switch
EP2256766A1 (fr) * 2009-05-28 2010-12-01 Eaton Industries GmbH Système de contact de pont
WO2011095219A1 (fr) * 2010-02-05 2011-08-11 Siemens Aktiengesellschaft Support pour un dispositif de commutation électromagnétique
FR2957712A1 (fr) * 2010-03-19 2011-09-23 Schneider Electric Ind Sas Dispositif de contact mobile pour contacteur de forte puissance resistive

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB470532A (en) * 1936-07-28 1937-08-17 Electrical Apparatus Co Ltd Improvements in and relating to electrical contact making and breaking devices
DE19856678C2 (de) * 1998-12-04 2002-01-24 Moeller Gmbh Elektrische Schaltvorrichtung
US6628184B1 (en) * 2000-11-20 2003-09-30 General Electric Company Field configurable contacts and contactor
CN2498725Y (zh) * 2001-09-09 2002-07-03 郑春开 一种按动开关单触桥双向动触头机构

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3602850A (en) 1969-08-27 1971-08-31 Westinghouse Electric Corp Contactor with improved contact support means and guide means
US3646491A (en) 1970-12-18 1972-02-29 Square D Co Movable contact structure for an electric switch
EP2256766A1 (fr) * 2009-05-28 2010-12-01 Eaton Industries GmbH Système de contact de pont
WO2011095219A1 (fr) * 2010-02-05 2011-08-11 Siemens Aktiengesellschaft Support pour un dispositif de commutation électromagnétique
FR2957712A1 (fr) * 2010-03-19 2011-09-23 Schneider Electric Ind Sas Dispositif de contact mobile pour contacteur de forte puissance resistive

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021128179A1 (de) 2021-10-28 2023-05-04 Te Connectivity Germany Gmbh Schaltkontaktbaugruppe für ein elektrisches Schaltelement und elektrisches Schaltelement

Also Published As

Publication number Publication date
BR112014014047A2 (pt) 2017-06-13
EP2729952B1 (fr) 2016-03-30
CN103858198A (zh) 2014-06-11
EP2729952A1 (fr) 2014-05-14
CN103858198B (zh) 2017-06-16

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