EP2434508B1 - Elektrische Kontaktanordnung mit Kranzanordnung, die aus Kontaktfingern besteht - Google Patents

Elektrische Kontaktanordnung mit Kranzanordnung, die aus Kontaktfingern besteht Download PDF

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Publication number
EP2434508B1
EP2434508B1 EP10010461.1A EP10010461A EP2434508B1 EP 2434508 B1 EP2434508 B1 EP 2434508B1 EP 10010461 A EP10010461 A EP 10010461A EP 2434508 B1 EP2434508 B1 EP 2434508B1
Authority
EP
European Patent Office
Prior art keywords
contact
electrical contact
fingers
arrangement according
finger
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.)
Not-in-force
Application number
EP10010461.1A
Other languages
English (en)
French (fr)
Other versions
EP2434508A1 (de
Inventor
Christian Reuber
Dietmar Gentsch
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 Technology AG
Original Assignee
ABB Technology AG
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 Technology AG filed Critical ABB Technology AG
Priority to EP10010461.1A priority Critical patent/EP2434508B1/de
Priority to PCT/EP2011/004775 priority patent/WO2012038091A1/en
Priority to CN201190000856.9U priority patent/CN203659648U/zh
Publication of EP2434508A1 publication Critical patent/EP2434508A1/de
Application granted granted Critical
Publication of EP2434508B1 publication Critical patent/EP2434508B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/38—Plug-and-socket contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved
    • 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
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/46—Contacts characterised by the manner in which co-operating contacts engage by sliding self-aligning contacts

Definitions

  • the present invention relates to an electrical contact arrangement for medium to high voltage applications with an annulus unit consisting of circular arranged and axially directed contact fingers, which are attached to the distal end section of the contact arm.
  • Medium voltage circuit breakers interrupt the current by creating and extinguishing the arc in a vacuum container.
  • Modem vacuum circuit breakers tend to have longer life expectancy than air or SF6 circuit breakers.
  • Vacuum circuit breakers replace air and SF6 circuit breakers at least for indoor applications.
  • the present invention is mostly directed to air circuit breakers in the range of medium voltage to high voltage applications, especially for electrical connectors in air insulated medium voltage switchgear panels.
  • Such switchgear panels require means or contact systems to connect and disconnect the electrical circuit to busbar terminals cables and terminal cables of the panel when they are being inserted and removed, respectively. Therefore, special electrical contact arrangements are provided having several contact fingers forming a circular crown shaped arrangement for electrically connecting the distal end section of a contact arm to the busbar terminal in the panel or the like.
  • the document DE 196 48 633 A1 discloses an electrical contact arrangement for high voltage applications comprising an annulus arrangement consisting of several axially and parallel directed contact fingers which are separated one to another by intermediate slits.
  • the contact fingers are designed as respective sections of a one piece sleeve part, which is mechanically and electrically connected to the distal end of the contact arm.
  • the contact fingers are designed as single pieces. For an electro-mechanical contact to the contact arm, these single fingers are pressed with a surrounding spring ring onto a ring shaped surface on the distal end section of the contact arm.
  • the contact fingers are supported by a structure to avoid twisting in order to ensure the parallel orientation of the contact fingers one to another.
  • each contact finger is relatively low usually, resulting in a relatively low number of electrical contact points and in a relatively high current that each contact point has to carry. Furthermore, the assembly of each contact finger onto the contact arm causes a high manual work effort.
  • the document FR 2492579 A1 and the DE 36 09 161 A1 disclose electrical contact fingers which are implemented en bloc or at one end of a tube.
  • the single contact fingers are fixed one to another on the outer side or the inner side of the common supporting ring.
  • the present invention proposes to use more and thinner contact fingers which are pre-mounted onto the special supporting ring and not on the contact arm.
  • the advantage of this special technical solution is reduced ohmic resistance and reduced contact resistance as many contact fingers form the pre-mounted annulus unit. Furthermore, there is an advantage under certain conditions due to the high number of single contact points. It is possible to connect the single contact fingers automatically to the supporting ring after punching.
  • the special supporting ring is preferably formed by a bended sheet metal band, which is glued or welded together on its end sides.
  • the fixation of the single contact fingers with the supporting ring or the band can be done in several ways, preferably by gluing the band to the contact fingers. This can also be done by using hot melt glue that is poured on a roll of correctly spaced contact fingers.
  • the contact fingers can have means to increase their glued surface, like holes, grooves, rivet or sandblasted surfaces.
  • Another way - a secod embodiment- is to use a supporting ring with snap-on connection means that latch with holes or another recess in the contact fingers.
  • the snap-on connection means for the contact fingers preferably consist of a pair of corresponding clamps radially moulded on the supporting ring.
  • a metal band for forming the supporting ring of the contact fingers can be cut to the required length and bended around the contact arm. After forming the arrangement can be fixed with one or more spring rings which are peripherally arranged around the contact fingers. At least one spring ring should be a spiral ring or the like.
  • each contact finger can have one or more embossments that can be made within the punching process, that control the distance and angle to the adjacent contact finger.
  • at least one circular fibre running through each contact finger with support spacers for defining the distance between the contact fingers.
  • the single contact fingers are formed by parallel slittings of a sheet metal which is bended to form the circular ring.
  • the solution avoids pre-production of single contact fingers which have to be mounted to the annulus unit according to the foregoing described first embodiment.
  • the circular ring is preferably attached to the distal end of the contact rod via several holes by screwing or the like.
  • the circular ring itself is preferably produced by punching sheet metal in order to form the parallel slits between the contact fingers as well as the holes or other fastening means to the contact arm. After punching the part can be rolled to form the annulus unit of the electrical contact arrangement.
  • the contact fingers are surrounded by a spring element, which is disposed on the distal ends of the contact fingers the width of the contact fingers, the width of the gap between the contact fingers and the force generated by the spring ring can be chosen in a way that the spring ring compresses the annulus unit to a certain diameter, if the contact fingers are not engaged with the corresponding terminal of the panel or the like.
  • the sheet metal is provided with a bended bottom section in order to form a pot shaped annulus unit.
  • the bottom section is preferably provided with a central hole for a screw element or another connecting element for attaching the pot shaped annulus unit onto the front side of the contact arm.
  • That special attachment solution provides a stable mechanical connection as well as a reliable electrical connection. It is proposed to add cut-offs in the region of the central hole that is to be bended and rolled on the edge in order to make the process of bending easier.
  • the electrical contact arrangement as shown in Figure 1 principally consists of a contact arm 1, which is designed as a hollow cylinder made of copper material. On its left side the contact arm 1 is mechanically connected to a - not shown - medium voltage circuit breaker pole part. On its right side the contact arm 1 is provided with a circular shaped annulus arrangement.
  • the special annulus arrangement consists of several axial and parallel directed contact fingers 2. Each contact finger 2 is pressed onto the distal end section of the contact arm 1 by a spring ring 5 which peripherally surrounds the circular arranged contact fingers 2 in order to form the kind of annulus unit.
  • All contact fingers 2 are fixed one to another on an inner side 4 of a common supporting ring 5. Each contact finger 2 is attached to the supporting ring 5 by gluing in the present sample.
  • the annulus unit consists of a pre-assembled flat strip which has to be bended to an annular form in order to reach the circular arrangement of single contacts fingers 2.
  • the supporting ring 5 is a flat band.
  • the single contact fingers 2 are attached to the supporting ring by snap-on connection means.
  • the snap-on connection means for the contact fingers 2 consists of a pair of corresponding clamps 6a and 6b which are directly moulded onto supporting ring 5.
  • the pair of corresponding clamps 6a and 6b engages in a respective recess or hole 7 in each contact finger 2.
  • each contact finger 2 comprises several embossed sections 8 for defining distance between adjacent contact fingers 2, the embossed section 8 is made within the punching process of contact fingers 2 and controls the distance and angle to the adjacent contact finger 2.
  • FIG. 5 Another embodiment of the annulus unit is shown in Figure 5 .
  • Two circular fibres 9a and 9b run through each contact finger 2 and support spacer 10 for defining the distance between the contact fingers 2.
  • FIG. 6 shows contact fingers 2 which are formed by parallel slittings 11 of a sheet metal 12 which is bended to the form of a circular ring 3.
  • the circular ring 3 is attached to the distal end of the contact rod 1 via several holes 13 by screwing. All fingers 2 of the annulus unit are surrounded by a spring ring 14 disposed on the distal ends of the contact fingers 2.
  • Figure 7 shows the slitted sheet metal 12 before bending to the ring shape.
  • annulus unit with circular arranged contact fingers 2 is formed by a sheet metal 12 having a bended bottom section 15.
  • a pot shaped annulus comprises a central hole 16 for a screw element 17 for attaching the pot shaped annulus unit onto the front side of the contact arm 1.
  • the bottom section 15 of the pot shaped annulus unit comprises several cut-outs 18 forming a star shaped recess on the periphery of the central hole 16 in order to get an even bottom section 15.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Contacts (AREA)
  • Clamps And Clips (AREA)

Claims (13)

  1. Elektrische Kontaktanordnung für Mittel- bis Hochspannungsanwendungen mit einer Kranzeinheit, die aus kreisförmig angeordneten und axial gerichteten Kontaktfingern (2) besteht, die an einem distalen Ende eines Kontaktarms (1) befestigt sind,
    wobei die einzelnen Kontaktfinger (2) aneinander an der Außenseite oder der Innenseite (4) eines gemeinsamen Stützrings (5) fixiert sind, wobei der Stützring (5) aus einem Metallbandmaterial besteht, das derart gebogen ist, dass es einen kreisförmigen Ring bildet, und
    dadurch gekennzeichnet, dass die Kontaktfinger (2) außerdem an dem Kontaktarm (1) durch nur einen Federring (3) befestigt sind, der entlang des Umfangs um die Kontaktfinger (2) angeordnet ist.
  2. Elektrische Kontaktanordnung nach Anspruch 1,
    dadurch gekennzeichnet, dass jeder Kontaktfinger (2) an dem Stützring (5) durch Kleben oder Schweißen befestigt ist.
  3. Elektrische Kontaktanordnung nach Anspruch 2,
    dadurch gekennzeichnet, dass jeder Kontaktfinger (2) Mittel zum Erhöhen der Kontaktoberfläche oder Struktur des Stützrings (5) umfasst.
  4. Elektrische Kontaktanordnung nach Anspruch 1,
    dadurch gekennzeichnet, dass jeder Kontaktfinger (2) an dem Stützring (5) durch Rastverbindungsmittel befestigt ist.
  5. Elektrische Kontaktanordnung nach Anspruch 4,
    dadurch gekennzeichnet, dass die Rastverbindungsmittel für den Kontaktfinger (2) aus einem Paar entsprechender Klemmen (6a, 6b) bestehen, die radial an den Stützring (5) angeformt sind, um in eine entsprechende Aussparung oder ein entsprechendes Loch (7) in dem Kontaktfinger (2) einzugreifen.
  6. Elektrische Kontaktanordnung nach Anspruch 1,
    dadurch gekennzeichnet, dass jeder Kontaktfinger (2) mindestens einen geprägten Abschnitt (8) umfasst, um einen Abstand zu dem benachbarten Kontaktfinger (2) zu definieren.
  7. Elektrische Kontaktanordnung nach Anspruch 1,
    dadurch gekennzeichnet, dass mindestens eine kreisförmige Faser (9a, 9b) durch jeden Kontaktfinger (2) verläuft, wobei jede von ihnen Abstandshalter (10) stützt, um einen Abstand und einen Winkel zwischen den Kontaktfingern (2) zu definieren.
  8. Elektrische Kontaktanordnung nach Anspruch 1,
    dadurch gekennzeichnet, dass jeder Kontaktfinger (2) mindestens zwei geprägte Abschnitte umfasst, um einen Abstand und einen Winkel zu dem benachbarten Kontaktfinger (2) zu definieren.
  9. Elektrische Kontaktanordnung für Mittel- bis Hochspannungsanwendungen mit einer Kranzeinheit, die aus kreisförmig angeordneten und axial gerichteten Kontaktfingern (2) besteht, die an einem distalen Ende eines Kontaktarms (1) befestigt sind,
    wobei die einzelnen Kontaktfinger (2) durch parallel Schlitze (11) eines Metallblechs (12) gebildet sind, das derart gebogen ist, dass es einen kreisförmigen Ring (3) bildet, und
    dadurch gekennzeichnet, dass die Kontaktfinger (2) von nur einem Federring (14) umgeben sind, der an den distalen Enden der Kontaktfinger (2) angeordnet ist.
  10. Elektrische Kontaktanordnung nach Anspruch 9,
    dadurch gekennzeichnet, dass der kreisförmige Ring (3) an dem distalen Ende des Kontaktarms (1) über mehrere Löcher (13) durch Verschrauben befestigt ist.
  11. Elektrische Kontaktanordnung nach Anspruch 9,
    dadurch gekennzeichnet, dass das Metallblech (12) mit einem gebogenen unteren Abschnitt (15) versehen ist, um eine topfförmige Kranzeinheit zu bilden.
  12. Elektrische Kontaktanordnung nach Anspruch 9,
    dadurch gekennzeichnet, dass ein zentrales Loch (16) für ein Schraubenelement (17) in dem unteren Abschnitt (15) der topfförmigen Kranzeinheit zum Verschrauben der topfförmigen Kranzeinheit an der Vorderseite des Kontaktarms (1) angeordnet ist.
  13. Elektrische Kontaktanordnung nach Anspruch 9,
    dadurch gekennzeichnet, dass das zentrale Loch (16) mehrere Ausschnitte (18) umfasst, die eine sternförmige Aussparung auf dem unteren Abschnitt (15) bilden.
EP10010461.1A 2010-09-24 2010-09-24 Elektrische Kontaktanordnung mit Kranzanordnung, die aus Kontaktfingern besteht Not-in-force EP2434508B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP10010461.1A EP2434508B1 (de) 2010-09-24 2010-09-24 Elektrische Kontaktanordnung mit Kranzanordnung, die aus Kontaktfingern besteht
PCT/EP2011/004775 WO2012038091A1 (en) 2010-09-24 2011-09-23 Electrical contact arrangement with annulus unit consisting of contact fingers
CN201190000856.9U CN203659648U (zh) 2010-09-24 2011-09-23 具有由接触指构成的环状单元的电接触装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10010461.1A EP2434508B1 (de) 2010-09-24 2010-09-24 Elektrische Kontaktanordnung mit Kranzanordnung, die aus Kontaktfingern besteht

Publications (2)

Publication Number Publication Date
EP2434508A1 EP2434508A1 (de) 2012-03-28
EP2434508B1 true EP2434508B1 (de) 2016-03-30

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Application Number Title Priority Date Filing Date
EP10010461.1A Not-in-force EP2434508B1 (de) 2010-09-24 2010-09-24 Elektrische Kontaktanordnung mit Kranzanordnung, die aus Kontaktfingern besteht

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EP (1) EP2434508B1 (de)
CN (1) CN203659648U (de)
WO (1) WO2012038091A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104158009B (zh) * 2013-07-17 2016-12-28 国家电网公司 一种导电触指及使用该导电触指的接线板
EP2833385B1 (de) * 2013-07-30 2017-05-03 ABB Schweiz AG Verbindungsvorrichtung für Schaltgetriebevorrichtung
CN107293438B (zh) * 2016-04-12 2019-09-06 闫淼江 一种高压隔离开关的触头组件及其阴触头

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7442783U (de) * 1974-12-21 1975-05-07 Calor Emag Elektrizitaets Ag
FR2492579A1 (fr) * 1980-10-22 1982-04-23 Alsthom Atlantique Contact pour appareillage electrique, tel que disjoncteur
JPS61233915A (ja) * 1985-04-04 1986-10-18 三菱電機株式会社 断路器
DE19648633A1 (de) 1996-11-25 1998-05-28 Asea Brown Boveri Elektrisches Schaltgerät

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CN203659648U (zh) 2014-06-18
EP2434508A1 (de) 2012-03-28
WO2012038091A1 (en) 2012-03-29

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