EP1843374A2 - Lichtbogenkontakt - Google Patents

Lichtbogenkontakt Download PDF

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Publication number
EP1843374A2
EP1843374A2 EP07105180A EP07105180A EP1843374A2 EP 1843374 A2 EP1843374 A2 EP 1843374A2 EP 07105180 A EP07105180 A EP 07105180A EP 07105180 A EP07105180 A EP 07105180A EP 1843374 A2 EP1843374 A2 EP 1843374A2
Authority
EP
European Patent Office
Prior art keywords
contact pin
contact
copper
tip
pin
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Withdrawn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
EP07105180A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1843374A3 (de
Inventor
Thomas Chyla
Volker Lehmann
Ronald Puls
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP1843374A2 publication Critical patent/EP1843374A2/de
Publication of EP1843374A3 publication Critical patent/EP1843374A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved

Definitions

  • the present invention relates to an arcing contact pin.
  • arc contacts are often present in addition to the rated current contacts, which disconnect after a turn-off after the rated current contacts. Due to the high voltage between the arcing contact pin and the mating contact forms an arc between these two immediately after the separation, which further maintains the flow of current. The arc is then blown, for example, with a quenching gas, such as sulfur hexafluoride (SF 6 ), to extinguish the arc and thereby interrupt the flow of current between the arcing contact pin and the arc counter contact. Only then is the switch-off process completed.
  • a quenching gas such as sulfur hexafluoride (SF 6 )
  • the contact pins In order to withstand the high temperatures of the turn-off arc, the contact pins have a contact tip of a Abbrandfesten material, usually tungsten on.
  • the tungsten tip is followed by copper as a low resistivity material.
  • the connection between the tungsten tip and the copper is realized as a welded connection.
  • the tungsten tip In order to weld the copper with the tungsten, the latter is drowned with copper. That is, the tungsten tip is formed as a sintered body into which liquid copper can penetrate.
  • the amount of copper is selected to form a closed copper layer over the sintered body of the contact tip at the weld side of the tip. This copper layer is then covered with the copper of the contact pin welded. In this way, a very good conductive contact pin can be realized with a erosion-resistant tip.
  • the mechanical strength of a contact pin produced in this way is determined by the weld, in particular by the copper layer on the welding surface of the contact tip.
  • both the arc contact pin and the arc counter contact are moved in opposite directions, so as to realize higher contact speeds. This increases above all the mechanical forces on the contacts. The highest mechanical loads do not occur when switching off, but when switching on.
  • Upon impact of the arcing contact pin on a recording for the arcing contact pin forming arc counter contact learns the arcing contact pin in addition to the forces caused by the high currents forces and high mechanical stresses due to pressure and shear forces. The higher the contact speed, the greater the mechanical stress on the arcing contact pin. If higher strengths of the arcing contact pin are to be achieved for higher contact speeds, this is achieved by increasing the diameter of the contact pin or by using a copper alloy with higher strength when drowning the contact tip.
  • the object of the present invention is to provide an improved arcing contact pin.
  • An inventive arc contact pin consists of a conductor material with low resistivity and has a contact tip made of a erosion-resistant material. In addition, it is provided with a extending up to the contact tip reinforcing element of a mechanically solid material compared to the conductor material. This can be achieved by simple means that the mechanical stability of the contact pin is increased compared to a contact pin according to the prior art, without its electrical conductivity is significantly impaired. The increased mechanical stability in turn allows increased contact speeds.
  • the contact tip is welded to the conductor material and the reinforcing element, for example a soul, extends inside the contact pin into the contact tip.
  • the reinforcing element bridges the weld and can thus for increased mechanical strength in the area of the weld.
  • the reinforcing element may in particular be screwed, pressed or connected by shrinkage with the contact tip into which it extends.
  • the contact tip remains firmly connected to the conductor material via the welded connection.
  • Screwed into the contact tip reinforcing element is thus not used to make the connection, but only to the reinforcement. In this way, the cohesive connection between the contact tip and the conductor material can be strengthened, without the electrical contact between the two is weakened.
  • the invention can be realized in particular in the context of arcing contact pins, in which the conductor material comprises copper, i. is made of copper or a copper-based alloy in which the erosion-resistant material comprises tungsten, that is made of tungsten or a tungsten-based alloy, and in which the mechanically strong material is steel. Due to its flexural strength, steel is particularly suitable as a material for the soul.
  • a arc contact pin over its entire length surrounding and integrally formed with the contact tip shell exists.
  • This embodiment makes it possible to expand a cylindrical area which is generally present anyway at the contact tip over the entire contact pin, so that the entire conductor material is surrounded by the jacket.
  • the entire arcing contact pin in one piece, ie be formed without weld, what its strength increased compared to an unreinforced welded arc contact pin.
  • the conductor material may consist of copper or a copper-based alloy and the erosion-resistant material of tungsten or an existing tungsten alloy.
  • the mechanical strength of the pin can be increased without changing its component dimensions. As a result, important dimension sizes for the arc extinguishing need not be changed.
  • the contact speed can be increased without increasing the extinguishing chambers. Another advantage is that the mass of the moving arcing contact pin is hardly changed and thus no additional reaction to the kinematic chain is created.
  • Fig. 1 shows a first embodiment of the inventive arc contact pin in a section through its longitudinal axis.
  • Fig. 2 shows a second embodiment of the arc contact pin according to the invention in a section through its longitudinal axis.
  • the arc contact pin 1 is made of a cylindrical pin 3 and a likewise cylindrical Contact tip 5 composed.
  • the contact tip 5 is welded to the cylindrical pin 3.
  • the weld is indicated in Fig. 1 by the reference numeral 4.
  • the cylindrical pin 3 made of copper or a copper alloy
  • the contact tip 5 is made of tungsten or a tungsten alloy, which is drowned with copper.
  • the contact tip 5 has a sintered cylindrical tungsten body 7 (or a tungsten alloy sintered body).
  • the tungsten body 7 is formed as a hollow body with an axially extending opening 11 except for its tip portion. At the tip portion 9, therefore, a shell portion 13 connects, which has the shape of a hollow cylinder.
  • the opening 11 of the sintered tungsten body 7 is filled with liquid copper, wherein the sintered body is drowned with copper.
  • liquid copper enters pores contained in the sintered tungsten body 7.
  • the filling of the copper takes place with the cylinder standing with the opening 11 open at the top.
  • the filling into the opening 11 takes place until copper projects beyond the opening 11 in the area of the tungsten body 7 facing away from the tip section 9.
  • the protruding copper 15 forms the contact surface for welding the contact tip 5 with the likewise made of copper cylindrical pin. 3
  • the Schuertränkte copper offers in the operation of the arcing contact pin has the advantage that the penetrated into the cavities of the sintered copper during the existence of the Arc evaporates and thus deprives the tungsten heat. After the arc is extinguished, the copper condenses and hardens, releasing the previously absorbed heat.
  • a steel core 17 extends through the entire cylindrical pin 3 and partly through the copper filling of the contact tip 5.
  • the steel core 17 is in its front portion 19 with the copper in the opening 11 bolted. Due to its bending strength, the steel core 17 increases the strength of the welded joint without increasing the diameter of the arcing contact pin 1 and without the use of the higher-strength copper material. The increased resistance to pressure and shear forces in the arcing contact pin 1 is provided by the soul 17 alone.
  • the steel core can be connected by means of other positive connections, eg. By means of shrinking or crushing, with the copper filling of the opening 11.
  • a second embodiment of the arc contact pin according to the invention is shown in Fig. 2.
  • the arcing contact pin 100 of the second embodiment in contrast to the arcing contact pin 100 of the first embodiment, no weld 4. Instead, the entire arcing contact pin is formed by a sintered tungsten body 107, the shell portion 113 of which is extended in the direction of the longitudinal axis A relative to the tungsten body 7 of FIG. 1 so that it extends over the entire length of the arcing contact pin 100, and its Opening filled with copper.
  • the sintered tungsten body is drowned in the filling of the opening 111 with copper.
  • the tip portion 109 of the tungsten body 107 corresponds to the tip portion 9 of the first embodiment.
  • the arcing contact pin 100 consists entirely of an extended contact tip 105, as indicated in Fig. 1 by the reference numeral 5.
  • the increased strength of the completely made of the copper-filled tungsten body 107 existing contact pin 100 results from the lack of weld, which is basically a weakness of the arcing contact pin, unless it is by means of a reinforcing element, for example.
  • the described invention provides ways to improve arcing contact pins, in particular with regard to their resistance to mechanical shear forces, without increasing the dimensions of the contact pin. This allows in particular the replacement of contact pins in existing arcing contacts by contact pins according to the invention. In addition, higher contact speeds are possible.
EP07105180A 2006-04-04 2007-03-29 Lichtbogenkontakt Withdrawn EP1843374A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610016723 DE102006016723A1 (de) 2006-04-04 2006-04-04 Lichtbogenkontaktstift

Publications (2)

Publication Number Publication Date
EP1843374A2 true EP1843374A2 (de) 2007-10-10
EP1843374A3 EP1843374A3 (de) 2008-04-30

Family

ID=38110027

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07105180A Withdrawn EP1843374A3 (de) 2006-04-04 2007-03-29 Lichtbogenkontakt

Country Status (2)

Country Link
EP (1) EP1843374A3 (nl)
DE (1) DE102006016723A1 (nl)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013092530A3 (de) * 2011-12-21 2013-08-15 Doduco Gmbh Kontaktstift für hochspannungs-leistungsschalter und hochspannungs-leistungsschalter mit einem solchen kontaktstift
DE102015207120A1 (de) 2015-04-20 2016-10-20 Siemens Aktiengesellschaft Lichtbogenkontakt für eine elektrische Schalteinrichtung und Schalteinrichtung mit hochabbrandfester Pinspitze

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT13815U3 (de) * 2014-02-21 2015-05-15 Plansee Powertech Ag Kontaktstift und Rohrkontakt sowie Verfahren zur Herstellung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752946A (en) * 1972-03-01 1973-08-14 Gen Electric Arcing contract for an electric circuit breaker and method of making same
EP0205897A2 (de) * 1985-06-24 1986-12-30 BBC Brown Boveri AG Abbrandkontaktstück und Verfahren zur Herstellung eines solchen Abbrandkontaktstückes oder eines vergleichbaren Bauteils
EP0951029A2 (de) * 1998-04-14 1999-10-20 Asea Brown Boveri Ag Abbrandschaltanordnung
US6211478B1 (en) * 1998-08-21 2001-04-03 Asea Brown Boveri Ag Switching arrangement and method for its production

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH653478A5 (en) * 1981-01-23 1985-12-31 Sprecher & Schuh Ag Gas-blast circuit breaker
DE19543815A1 (de) * 1995-11-24 1997-05-28 Asea Brown Boveri Elektrisches Schaltgerät

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752946A (en) * 1972-03-01 1973-08-14 Gen Electric Arcing contract for an electric circuit breaker and method of making same
EP0205897A2 (de) * 1985-06-24 1986-12-30 BBC Brown Boveri AG Abbrandkontaktstück und Verfahren zur Herstellung eines solchen Abbrandkontaktstückes oder eines vergleichbaren Bauteils
EP0951029A2 (de) * 1998-04-14 1999-10-20 Asea Brown Boveri Ag Abbrandschaltanordnung
US6211478B1 (en) * 1998-08-21 2001-04-03 Asea Brown Boveri Ag Switching arrangement and method for its production

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013092530A3 (de) * 2011-12-21 2013-08-15 Doduco Gmbh Kontaktstift für hochspannungs-leistungsschalter und hochspannungs-leistungsschalter mit einem solchen kontaktstift
DE102015207120A1 (de) 2015-04-20 2016-10-20 Siemens Aktiengesellschaft Lichtbogenkontakt für eine elektrische Schalteinrichtung und Schalteinrichtung mit hochabbrandfester Pinspitze
WO2016169736A1 (de) 2015-04-20 2016-10-27 Siemens Aktiengesellschaft Lichtbogenkontakt für eine elektrische schalteinrichtung und schalteinrichtung mit hochabbrandfester pinspitze

Also Published As

Publication number Publication date
EP1843374A3 (de) 2008-04-30
DE102006016723A1 (de) 2007-10-11

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