EP1700325B1 - Organe de contact electrique pour appareillage electrique en moyenne ou haute tension, procede et appareillage correspondants - Google Patents

Organe de contact electrique pour appareillage electrique en moyenne ou haute tension, procede et appareillage correspondants Download PDF

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Publication number
EP1700325B1
EP1700325B1 EP04817609A EP04817609A EP1700325B1 EP 1700325 B1 EP1700325 B1 EP 1700325B1 EP 04817609 A EP04817609 A EP 04817609A EP 04817609 A EP04817609 A EP 04817609A EP 1700325 B1 EP1700325 B1 EP 1700325B1
Authority
EP
European Patent Office
Prior art keywords
contact member
electrical contact
coating layer
base layer
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.)
Not-in-force
Application number
EP04817609A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1700325A1 (fr
Inventor
Jean-Luc Bessede
Pierre Giannini
Oana Visata
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.)
Grid Solutions SAS
Original Assignee
Areva T&D SAS
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 Areva T&D SAS filed Critical Areva T&D SAS
Publication of EP1700325A1 publication Critical patent/EP1700325A1/fr
Application granted granted Critical
Publication of EP1700325B1 publication Critical patent/EP1700325B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • 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
    • H01H1/5833—Electric connections to or between contacts; Terminals comprising an articulating, sliding or rolling contact between movable contact and terminal
    • 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
    • H01H1/385—Contact arrangements for high voltage gas blast circuit breakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/03—Contact members characterised by the material, e.g. plating, or coating materials

Definitions

  • the present invention relates to an electrical contact member for electrical equipment in medium or high voltage, a method of manufacturing such a member, and an electrical equipment in medium or high voltage provided with at least one such body.
  • Mean or high voltage means a voltage greater than about 1000 Volts.
  • the invention finds application in two main types of electrical equipment.
  • such a mobile type apparatus comprises a contact assembly, which is provided with two respectively fixed and movable members.
  • the movable member can thus be moved, relative to the fixed member, between a contact position and a separate position or cutoff.
  • Each member is provided, first of all, with a respective arc contact element.
  • these bodies respectively fixed and movable, are provided with permanent contacts, which provide electrical continuity, especially in the closed position.
  • connection piece which usually passes through the casing of the device, so as to be connected to an external power line. In use, it is necessary to maintain electrical contact between this connection piece and the aforementioned movable member, regardless of the position of the latter.
  • This electrical continuity is provided by an electrical contact member, also covered by the invention.
  • the invention is also applicable to electrical equipment of a generally static type.
  • it includes a set of busbars.
  • the present invention relates to an electrical contact member, which is able to connect electrically in series two conductive members belonging to an electrical apparatus in medium or high voltage.
  • the two bodies considered are likely to move relative to each other because of either the nature of the electrical equipment, or the operating contingencies of this equipment.
  • FR-A-0 334 094 discloses a rolling contact member of elastic nature.
  • the dimensions of this hollow organ, which is deformable, are such that it is slightly crushed between the two movable members, which it electrically connects. This therefore makes it possible to exert a mechanical pressure, ensuring the desired electrical contact.
  • an electrical contact member having a finger shape which is made of a material having both low resistivity and good corrosion resistance.
  • These include an alloy of copper, chromium and zirconium, or an alloy of copper and beryllium.
  • these materials are not satisfactorily adapted to a use of dynamic type, especially since they are subject to significant wear.
  • US-2002096662 relates to an electrical contact member, arranged in the form of a metal strip, which is made of copper or an alloy coated with tin and silver, the latter element being present at a rate of not more than 4% in weight. This material however does not lend itself, optimally, to a dynamic type of use.
  • DE-A-4230060 discloses an arc contact element, for circuit breaker, whose coating is made of a silver and palladium alloy. Such a solution, however, is not satisfactory either, especially since palladium has certain drawbacks in terms of electrical conductivity.
  • an electrical contact member which is constituted by a strip of lamellae.
  • the latter which are out of the plane of the band by torsion, are covered by means of a layer of an electrically conductive material, such as silver.
  • the invention proposes to overcome all the disadvantages of the prior art mentioned above.
  • the invention also aims to provide such a member which has a good temperature resistance, as well as satisfactory electrical and mechanical properties, while inducing only a low contact force on the movable members that electrically connects.
  • the invention also aims to provide such a contact member, which has a high chemical resistance, particularly with regard to corrosion. Indeed, in some applications of this contact member, it evolves in an aggressive environment, due to the presence of corrosive species from the decomposition of certain dielectric gases initially present in the equipment.
  • the invention aims to provide such a contact member, whose cost is relatively low.
  • an electrical contact member adapted to electrically connect in series two conductive members able to move relative to each other, which belong to an electrical equipment in medium or high voltage, including a switchgear or a set of busbars, at least a part of this contact member comprising a base layer, of mechanical strength, made of a material electrically conductive, and a coating layer formed from metallic silver, intended to come into contact with the two electrically conductive members, said coating layer being present on at least a portion of the outer surface of the base layer , characterized in that said coating layer has a micro-structure formed by pure silver crystals, with presence of nodules composed of silver and a metal addition material formed of at least one metal of addition , different from money.
  • the base layer gives the contact member, according to the invention, good electrical and mechanical properties.
  • the electrically conductive material of this base layer has an electrical resistivity of less than 200 ⁇ .cm.
  • the nature of the coating layer also provides the latter with good properties in terms of electrical conduction.
  • the addition material with which the silver is associated gives the latter improved mechanical properties, particularly in terms of hardening.
  • figure 1 is a microscopic diagram showing the microstructure of the coating layer, belonging to an electrical contact member according to the invention.
  • This micro-structure is obtained either by a metallurgical type process or by an electrolytic type process.
  • the characteristic dimension of this structure is smaller, since it is of the order of one hundred nanometers.
  • the characteristic dimension of this structure is higher, since it is of the order of ten micrometers.
  • this coating layer is very predominantly made of metallic silver, with presence in a very small amount of an addition metal denoted M, namely for example 0.5%.
  • M an addition metal
  • the addition material guarantees an improvement in the mechanical properties of the coating layer, thanks to the known phenomenon of structural hardening. Moreover, in the case where this layer is obtained by an electrolytic process, this addition material allows a better arrangement between the atoms of the successive layers of silver, inducing a strong compaction of the latter, and therefore a high hardness. The phenomena mentioned above allow therefore to avoid rapid wear of the coating layer, during friction of the contact member against the two electrically conductive members.
  • the figure 2 illustrates a metallurgical structure of a coating layer of the prior art, consisting solely of metallic silver. We thus find only silver I crystals, with no additional element. Although this structure is satisfactory in terms of electrical conductivity, it does not prove to be of good quality as regards the mechanical strength.
  • the or each metal forming the additive material does not belong to the platinum column.
  • the latter comprises the following elements, namely nickel, palladium and platinum.
  • the additive material is formed of at least one element chosen from copper, phosphorus and indium.
  • the additive material is present in the coating layer in a proportion of less than 1% by weight, preferably less than 0.5% by weight, and even more preferably at less than 0.5% by weight. less than 0.1% by weight. This makes it possible not to substantially reduce the electrical conductivity of this coating layer.
  • the additive material is present in the coating layer in a proportion of more than 0.001% by weight, preferably more than 0.01% by weight. This gives the coating layer good mechanical properties, particularly in terms of abrasion in the case of intensive dynamic use.
  • the coating layer may be present on the entire outer surface of the base layer. As an alternative, it can be provided only at the contact areas with the conductive members, intended to be electrically connected by the contact member within the meaning of the invention.
  • the thickness of the coating layer is between 1 and 1000 micrometers, preferably between 10 and 500 micrometers. Note that the value of this thickness depends in particular on the size of the electrical contact member, as well as the application that it is desired to confer on the latter.
  • the base layer is made of copper, alloyed with zirconium and / or chromium.
  • chromium and / or zirconium are present in a proportion of less than 1% by weight, preferably less than 0.5% by weight of the base layer. This gives the latter good mechanical and thermal properties, without, however, significantly altering its electrical properties.
  • an interface layer intended to improve the adhesion between this base layer and this coating layer.
  • This interface layer provides the mechanical support of the coating layer, while preventing the diffusion of the different constituent elements of the base and coating layers from one to the other of these layers.
  • Such an interface layer is for example made of optionally alloy nickel, or optionally palladium alloyed.
  • This interface layer advantageously has a thickness of between 1 and 10 micrometers.
  • the electrical contact member is folded on itself, in the manner of a ring.
  • the electrical contact member is made in one piece. It may in particular be formed of a single wire, wound on itself so as to form a succession of turns. The manufacture of such a yarn is particularly described in EP-A-0 890 758 .
  • this wire is able to have any section, namely circular, polygonal with rounded edges, elliptical or oval.
  • the electrical contact member may be formed of a plurality of contact elements.
  • these different contact elements are secured to one another. It may be in particular strips folded in the manner of an accordion, the ends facing each other are mutually secured, so that these different bands form a ring. They may also be punched strips, or cut and stamped strips, in accordance with the teaching of FR-A-2,811,147 .
  • the different contact elements are independent.
  • these include finger-shaped elements, which are provided discretely at the inner and outer peripheries respectively of the two electrically conductive members.
  • only the base layer is shaped, then this shaped base layer is covered by means of the coating layer.
  • the base layer is first covered by means of the coating layer, and then this base layer and this coating layer are shaped at the same time.
  • the base layer is shaped at the same time as it is covered by means of the coating layer.
  • Such shaping takes place in a conventional manner, for example by taking advantage of the known spinning process.
  • the coating layer is first produced in the form of a silver alloy and the additive material, before covering the base layer with this layer of coating thus produced.
  • this coating layer is alloyed beforehand, before its application on the base layer.
  • the base layer is coated with substantially pure silver, and then the substantially pure silver layer is coated with the additive material.
  • this additive material will gradually diffuse within the silver layer, in a manner known per se, for example under the effect of temperature, so as to form the coating layer.
  • the possible interface layer can be attached to the base layer, after shaping of the latter.
  • the invention is obj and a medium or high voltage electrical apparatus, comprising at least two electrically conductive members, able to move relative to each other in service, and at least one contact member electrical, able to electrically connect two adjacent conductive members, characterized in that the or each electrical contact member is as defined above.
  • the electrical equipment is a switchgear, in particular a circuit breaker or a disconnector.
  • the electrical equipment is a set of busbars.
  • the two electrically conductive members are arranged concentrically and the or each electrical contact member is immobilized, in use, by wedging between the walls facing these two conductive members.
  • this member can be received in a groove, formed in one or other of these two electrically conductive members.
  • the two electrically conductive members are arranged one behind the other, a hollow connecting piece engaging the ends opposite these two conductive members, while the or each contact member electrical is immobilized, in use, by wedging between the walls facing this connecting piece and at least one of the two conductive members.
  • the figure 4 partially illustrates a first type of electrical equipment covered by the invention, which is in this case a switchgear in medium or high voltage, for example a circuit breaker. On this figure 4 only the breaking chamber of this circuit breaker is shown. The arrangement thereof is conventional, so that it will be described briefly in the following.
  • This chamber 2 which is delimited by a cylindrical insulating envelope 4, is filled with an insulating gas, such as for example SF 6 . It comprises first of all a fixed contact member, affected as a whole by reference 6.
  • This member 6 comprises, in known manner, a support 8 on which is mounted an arc contact element 10. Finally, this fixed member 6 is provided with a fixed permanent contact, assigned reference 11, which is of type classic.
  • the interrupting chamber 2 also contains a movable contact member, generally designated by reference numeral 12.
  • This comprises a support 14, to which is attached a movable arcing contact element 16.
  • This movable member 12 is equipped conventionally of a contact tube 18, forming a moving permanent contact, which supports a nozzle or insulating nozzle 20.
  • the movable member 12 can be moved between a contact position, shown on the left of the figure 4 , in which the elements 10 and 16, as well as the contacts 11 and 18, are in mutual contact, and a breaking position, shown on the right of this figure 4 , in which these two elements 10 and 16, as well as the contacts 11 and 18, are mutually separated.
  • the contact tube 18 moves in the vicinity of the inner walls of a connecting piece 22, delimiting an annular channel for receiving this contact tube 18.
  • This connecting piece 22 is extended by a return transverse 22 1 , sealingly passing through the envelope 4. It is also connected, in a conventional manner, to a power line not shown.
  • connection piece 22 The walls of the connection piece 22 are hollowed out with a plurality of annular grooves 22 2 , in this case three in number. Each of these grooves receives an electrical contact member according to the invention, generally designated by the reference 24. These three contact members 24 thus ensure, in use, the electrical continuity between the contact tube 18 of the body mobile 12 and the connection piece 22.
  • the contact members 24 could be received in grooves, not provided in the walls of the part 22, but formed in the walls of the movable contact tube 18.
  • the member 24 is formed by a single wire 25, which is folded back on itself so as to form a succession of turns.
  • the arrangement of this wire 25 is in accordance with that described for example in EP-A-0 890 758 , the contents of which are incorporated by reference in the present description.
  • this annular member 24 has two or more physical contact surfaces and, therefore, electrical. It is first of all an inner surface S 1 through which the member 24 comes into contact with the tube 18. In addition, the surface outer S 2 of this member 24 allows it to come into contact with the walls of the connecting piece 22.
  • the figure 6 is a cross-sectional view, illustrating the various constituent layers of the wire 25, forming the contact member 24.
  • a base layer 26 made of a copper alloy and zirconium. This base layer has a diameter for example close to 5 mm.
  • This interface layer 27 allows better adhesion between the base layer 26 and a coating layer 28, which extends over the entire outer periphery of the base layer 26.
  • This coating layer 28 which is formed of silver alloyed with indium, present in a proportion of 0.09% by weight, has a thickness of 100 microns.
  • the coating layer 28 can only be provided at the respective inner and outer contact surfaces S 1 and S 2 , respectively. figure 5 .
  • the figure 7 illustrates a second type of electrical equipment, covered by the invention. This is in this case a set of busbars of a known type.
  • this figure 7 only two conductive bars 112 and 122, of structure known. It is furthermore provided a tubular connection piece 120, engaging the opposite ends of the two bars 112 and 122. At its two ends, this connecting piece 120 is hollowed with grooves 120 1 , each of which receives an electrical contact member 24. , which is as described with reference to Figures 4 to 6 .
  • connecting piece 120 may be provided with one or more electrical contact member (s) 24.
  • the other end of the connecting piece is directly fixed on the corresponding conductive bar , especially by screwing.
  • one and / or the other of the permanent contacts 11 and 18 are coated at least partially by means of a coating layer according to the invention.
  • a coating layer is especially provided at the respective contact surfaces, assigned references 11 1 and 18 1 on the figure 4 , belonging to these permanent contacts 11 and 18.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Contacts (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
EP04817609A 2003-12-29 2004-12-28 Organe de contact electrique pour appareillage electrique en moyenne ou haute tension, procede et appareillage correspondants Not-in-force EP1700325B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0351218A FR2864688B1 (fr) 2003-12-29 2003-12-29 Organe de contact electrique pour appareillage electrique en moyenne ou haute tension, procede et appareillage correspondants.
PCT/FR2004/003398 WO2005069327A1 (fr) 2003-12-29 2004-12-28 Organe de contact electrique pour appareillage electrique en moyenne ou haute tension, procede et appareillage correspondants

Publications (2)

Publication Number Publication Date
EP1700325A1 EP1700325A1 (fr) 2006-09-13
EP1700325B1 true EP1700325B1 (fr) 2010-06-30

Family

ID=34639767

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04817609A Not-in-force EP1700325B1 (fr) 2003-12-29 2004-12-28 Organe de contact electrique pour appareillage electrique en moyenne ou haute tension, procede et appareillage correspondants

Country Status (7)

Country Link
US (1) US7677915B2 (zh)
EP (1) EP1700325B1 (zh)
CN (1) CN1902721B (zh)
AT (1) ATE472810T1 (zh)
DE (1) DE602004027949D1 (zh)
FR (1) FR2864688B1 (zh)
WO (1) WO2005069327A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2835806A1 (en) * 2013-08-05 2015-02-11 ABB Technology AG High voltage interrupter unit with improved mechanical endurance
JP2015067861A (ja) * 2013-09-30 2015-04-13 株式会社オートネットワーク技術研究所 コネクタ用電気接点材料及びその製造方法
WO2021138366A1 (en) * 2019-12-31 2021-07-08 Southern States Llc High voltage electric power switch with carbon arcing electrodes and carbon dioxide dielectric gas

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1732839A (en) * 1927-05-31 1929-10-22 Hardy M Fredriksen Metal alloy for use in manufacturing electrical contacts
FR1292079A (fr) * 1960-06-15 1962-04-27 Thomson Houston Comp Francaise Structure de contact pour interrupteur à vide
US3561444A (en) * 1968-05-22 1971-02-09 Bio Logics Inc Ultrasonic drug nebulizer
FR2204864B3 (zh) * 1972-10-27 1976-01-30 Delle Alsthom Fr
DE4230060A1 (de) 1992-09-07 1994-03-10 Siemens Ag Trennschalter mit in einem Isoliergas angeordneten Kontaktgliedern
US5545842A (en) * 1993-10-26 1996-08-13 Bal Seal Engineering Company, Inc. Radially mounted spring to connect, lock and unlock, and for snap-on fastening, and for mechanical, electromagnetic shielding, electrical conductivity, and thermal dissipation with environmental sealing
SE506601C2 (sv) * 1996-05-23 1998-01-19 Asea Brown Boveri Kontaktanordning
DE19703345A1 (de) * 1997-01-30 1998-08-06 Abb Patent Gmbh Tulpenkontaktstück für ein Hochspannungsschaltgerät und Kontaktanordnung
JPH1172130A (ja) 1997-07-07 1999-03-16 Bal Seal Eng Co Inc 長軸に沿って傾けたコイルを備えた径方向用のばね及び軸線方向用のばね
DE10025107A1 (de) 2000-05-20 2001-11-22 Stolberger Metallwerke Gmbh Elektrisch leifähiges Metallband und Steckverbinder
FR2811147B1 (fr) 2000-06-29 2002-12-06 Alstom Procede de fabrication d'une bande de lamelles de contact electrique et bande de lamelles de contact electrique

Also Published As

Publication number Publication date
US20070111590A1 (en) 2007-05-17
US7677915B2 (en) 2010-03-16
CN1902721B (zh) 2010-06-23
FR2864688B1 (fr) 2006-02-24
FR2864688A1 (fr) 2005-07-01
ATE472810T1 (de) 2010-07-15
DE602004027949D1 (de) 2010-08-12
EP1700325A1 (fr) 2006-09-13
WO2005069327A1 (fr) 2005-07-28
CN1902721A (zh) 2007-01-24

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