EP0700062B1 - Hochspannungsschalter - Google Patents

Hochspannungsschalter Download PDF

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Publication number
EP0700062B1
EP0700062B1 EP19950113815 EP95113815A EP0700062B1 EP 0700062 B1 EP0700062 B1 EP 0700062B1 EP 19950113815 EP19950113815 EP 19950113815 EP 95113815 A EP95113815 A EP 95113815A EP 0700062 B1 EP0700062 B1 EP 0700062B1
Authority
EP
European Patent Office
Prior art keywords
contact
circuit breaker
end portion
casing
metal tube
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.)
Expired - Lifetime
Application number
EP19950113815
Other languages
English (en)
French (fr)
Other versions
EP0700062A1 (de
Inventor
Tomas Otterberg
Peter Stengard
Ulf Akesson
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 AB
Original Assignee
Asea Brown Boveri AB
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 Asea Brown Boveri AB filed Critical Asea Brown Boveri AB
Publication of EP0700062A1 publication Critical patent/EP0700062A1/de
Application granted granted Critical
Publication of EP0700062B1 publication Critical patent/EP0700062B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H1/12—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
    • 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
    • H01H33/24—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring

Definitions

  • the present invention relates to a high-voltage circuit breaker according to the precharacterising part of claim 1.
  • the invention is primarily intended for circuit breakers with rated operating voltages of the order of magnitude of 100-300 kV, but it may be used to advantage also in circuit breakers for voltages both above and below this range, for example in medium voltage circuit breakers.
  • Circuit breakers of the above-mentioned kind are previously known, for example from EP-A-0 475 270. Such circuit breakers must be capable of carrying very high operating currents, for example 4000 A, and it is therefore important for the resistance across each breaker pole to be as low as possible.
  • the stationary main contact of the circuit breaker is usually arranged at the free end portion of a hollow-cylindrical current path section which is fixed in the circuit breaker casing and which, for example, may consist of a copper tube.
  • a known design of such a main contact consists of a plurality of separate contact pieces which together with associated contact springs are movably mounted around the end portion of the current path section. In such a design, there are two series-connected current transition points at each contact piece, which entails a relatively high total contact resistance.
  • Another drawback in this design is that the mounting of the plurality of contact pieces is time-demanding and hence costly.
  • US-A-3 839 613 shows a circuit breaker of the above-mentioned kind, which is provided with a tubular stationary main contact with contact fingers formed by slotting. Also in case of this contact, in view of its design and the material thickness thereof, it cannot be formed in a simple manner by pressing (bulging). In addition, it is provided, at the free end portion of the contact, with a field-equalizing shield which projects in the radial direction and thus causes a considerable increase of the diameter of the stationary contact assembly. In addition, in this design there may also be a risk that one or more of the contact fingers are bent too far inwards, by mechanical or electromagnetic influence, thus causing operational disturbances.
  • the main object of the present invention is to provide a circuit breaker of the above-mentioned kind which does not suffer from the above-mentioned disadvantages of comparable prior art breakers.
  • the invention suggests a high-voltage circuit breaker according to the introductory part of claim 1, which is characterized by the features of the characterizing part of claim 1 or claim 2.
  • a main contact according to the invention which consists of a large number of contact fingers which are integral with the tube.
  • a larger number of parallel transition points is obtained than in the known contact arrangement with separately mounted contact pieces described above, since a tube with a given circumference may accommodate a larger number of the contact fingers integrated in the tube, since these contact fingers require less space in the lateral direction than separate contact pieces. This contributes to reduce the contact resistance.
  • the circuit breaker shown in Figure 1 has been described in the above-mentioned patent specification EP-A-0 475 270 and is only an example of the type of circuit breaker in which the present invention may advantageously be used.
  • the circuit breaker has a gas-tight casing 1 which comprises a stationary plug-shaped arcing contact 2 and an axially movable sleeve-shaped arcing contact 3.
  • the movable contact 3 is connected to an operating device via a tubular contact rod 4 and an insulating operating rod (the latter not shown). With the aid of the operating device, the movable contact may be displaced between the closed position shown on the lefthand side in the figure and the open position shown on the righthand side in the figure.
  • the movable contact 3 supports a hollow metal cylinder 5 which encloses a pressure-collecting space 6, the volume of which is constant, a compression space 7, and an electrically insulating blast nozzle 8 with an annular channel 9, which connects the pressure-collecting space 6 to the region where the arc is burning during an opening operation.
  • the hollow cylinder 5 constitutes the movable main contact of the circuit breaker, which contact cooperates with a stationary main contact 10.
  • the stationary contacts 2 and 10 of the circuit breaker are electrically and mechanically fixedly connected with each other, as are also the movable contacts 3 and 5.
  • the contact rod 4 is pulled downward with the aid of the operating device, whereby the main contacts 5 and 10 are first separated.
  • the current thereby commutates to the arcing contacts 2, 3 which upon their separation form an arc between them.
  • the arc heats the gas in the arc region whereby the gas pressure increases which starts a gas flow through the channel 9 into the pressure-collecting space 6.
  • the arc current follows the power frequency sine curve, and when the current approaches the zero crossing, the pressure in the arc region starts to decrease.
  • the contact movement has now proceeded so far that the plug contact 2 has exposed the nozzle outlet, where the pressure is now lower than in the pressure-collecting space 6. This gives rise to a gas flow from the pressure-collecting space 6 through the channel 9 and the nozzle 8 to the surrounding expansion space 11.
  • the arc is cooled by this flow and is extinguished during the zero-crossing of the current.
  • FIG 2 shows an upper current path section 12, designed according to the invention, with the stationary main contact 10 for a circuit breaker of, for example, the design shown in Figure 1.
  • the current path section 12 is shown separately in Figures 3a and 3b. It consists of a copper tube with a thickness of one or a few millimetres.
  • the upper end portion of the tube consists of a flange 13, formed by pressing (bulging), for fixing the tube against the upper end flange (not shown) of the circuit breaker, which end flange at the same time constitutes one of the two connection terminals of the circuit breaker.
  • the lower end portion of the tube is formed by pressing (bulging) and slotted such that a large number of contact fingers 14, integral with the tube, are formed.
  • the lower end portion of the tube is surrounded by a tubular metal sleeve 15, fixed to the tube, with approximately the same diameter as the non-pressure-formed part of the copper tube 12.
  • This sleeve has several different functions. Besides serving as a field-equalizing shield, it constitutes both holder and counter-support for spring elements 17, which are arranged between the metal sleeve 15 and the contact fingers 14.
  • the metal sleeve 15 also prevents the contact fingers from being bent too far inwards by providing the free end portion of the sleeve with an inwardly flanged portion 16, which is made with a substantially circular contour and which surrounds the end portions of the contact fingers.
  • the above-mentioned spring elements 17 may, for example, consist of a plurality of separate leaf springs of, for example, the embodiment shown in Figures 4a and 4b.
  • these spring elements may consist of a ring 18 arranged around the contact fingers of, for example, the embodiment shown in Figure 5.
  • This ring is formed from a resilient wire which is bent in a large number of meander-shaped loops and in such a way that the diameter of the ring decreases in an axial direction away from the mid-portion of the ring towards the ends.
  • metal tube 12 with the integrated contact fingers 14 is made of a self-resilient material, for example beryllium copper, the metal sleeve 15 and the spring elements 17 may be omitted.
  • Figure 6 shows an example of such a current path section with an integrated main contact of a self-resilient material.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)

Claims (7)

  1. Hochspannungsschalter mit einem längliche Gehäuse (1), welches mit einem gasförmigen Lichtbogenlöschmedium gefüllt ist und welches zwei kooperierende Lichtbogenkontakte (2,3) enthält, von denen einer (2) stationär ist, während der andere (3) in dem Gehäuse mit Hilfe einer Betätigungsvorrichtung zwischen einer geschlossenen und einer geöffneten Stellung achsial verschiebbar ist, und welches Gehäuse zwei kooperierende Hauptkontakte (10,5) enthält, die während eines Öffnungsvorganges sich früher trennen als die Lichtbogenkontakte, wobei einer der Hauptkontakte (10) aus einem ersten Endabschnitt eines ersten Metallrohres (12) besteht, welches an dem Gehäuse befestigt ist und den stationären Lichtbogenkontakt umgibt, während der andere Hauptkontakt (5) aus einem Endabschnitt eines zweiten Metallrohres besteht, welches um den beweglichen Lichtbogenkontakt angebracht ist und an dem genannten Kontakt befestigt ist, dadurch gekennzeichnet, daß der Endabschnitt des genannten ersten Metallrohres (12) durch Pressen, insbesondere durch Aufbauchen, geformt ist und zwecks Bildung einer Vielzahl von Kontaktfingern (14), die integrale Teile des Rohres (12) bilden, geschlitzt ist, daß der genannte Endabschnitt von einer rohrförmigen Metallhülse (15) umgeben ist, die als feldausgleichender Schirm dient, dessen freier Endabschnitt einen nach innen gerichteten Flanschabschnitt (16) hat, der eine im wesentlichen kreisförmige Kontur hat und die Endabschnitte der Kontaktfinger (14) derart umgibt, daß die nach innen gerichtete Biegung der Kontaktfinger begrenzt ist.
  2. Hochspannungsschalter mit einem längliche Gehäuse (1), welches mit einem gasförmigen Lichtbogenlöschmedium gefüllt ist und welches zwei kooperierende Lichtbogenkontakte (2,3) enthält, von denen einer (2) stationär ist, während der andere (3) in dem Gehäuse mit Hilfe einer Betätigungsvorrichtung zwischen einer geschlossenen und einer geöffneten Stellung achsial verschiebbar ist, und welches Gehäuse zwei kooperierende Hauptkontakte (10,5) enthält, die während eines Öffnungsvorganges sich früher trennen als die Lichtbogenkontakte, wobei einer der Hauptkontakte (10) aus einem ersten Endabschnitt eines ersten Metallrohres (12) besteht, welches an dem Gehäuse befestigt ist und den stationären Lichtbogenkontakt umgibt, während der andere Hauptkontakt (5) aus einem Endabschnitt eines zweiten Metallrohres besteht, welches um den beweglichen Lichtbogenkontakt angebracht ist und an dem genannten Kontakt befestigt ist, dadurch gekennzeichnet, daß das genannte erste Metallrohr (12) aus einem eigen-elastischen Material besteht und daß der Endabschnitt des ersten Metallrohres (12) durch Pressen, insbesondere durch Aufbauchen, geformt ist und zwecks Bildung einer Vielzahl von Kontaktfingern (14), die integrale Teile des Rohres (12) bilden, geschlitzt ist, wobei die freien Endabschnitte der genannten Kontaktfinger einen nach innen abgeflanschten Kragen mit einer im wesentlichen U-förmigen Kontur bilden, der als Kontakt und als ein feldausgleichender Schirm dient.
  3. Schalter nach Anspruch 1, dadurch gekennzeichnet, daß zwischen der Metallhülse (15) und den Kontaktfingern (14) Federelemente (17) zur Verstärkung des Kontaktdruckes angeordnet sind.
  4. Schalter nach einem der Ansprüche 1 oder 3,dadurch gekennzeichnet, daß die Metallhülse (15) mindestens angenähert den gleichen Durchmesser hat wie der nicht druckgeformte Teil des genannten ersten Metallrohres (12).
  5. Schalter nach einem der Ansprüche 3 oder 4, dadurch gekennzeichnet, daß die genannten Federelemente (17) aus einer Vielzahl separater Blattfedern bestehen.
  6. Schalter nach einem der Ansprüche 3 oder 4, dadurch gekennzeichnet, daß die genannten Federelemente (17) aus einem Ring (18) bestehen, der um die Kontaktfinger (14) herum angeordnet ist, und daß dieser Ring von einem elastischen Draht gebildet wird, der in eine große Anzahl mäanderförmiger Schleifen gebogen ist, und zwar derart, daß der Durchmesser des Ringes sich vom mittleren Abschnitt aus in achsialer Richtung zu den Enden des Ringes verkleinert.
  7. Schalter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das genannte erste Metallrohr (12) aus Kupfer oder einer Kupferlegierung besteht.
EP19950113815 1994-09-05 1995-09-02 Hochspannungsschalter Expired - Lifetime EP0700062B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9402970 1994-09-05
SE9402970A SE9402970L (sv) 1994-09-05 1994-09-05 Högspänningsbrytare

Publications (2)

Publication Number Publication Date
EP0700062A1 EP0700062A1 (de) 1996-03-06
EP0700062B1 true EP0700062B1 (de) 1999-03-31

Family

ID=20395144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950113815 Expired - Lifetime EP0700062B1 (de) 1994-09-05 1995-09-02 Hochspannungsschalter

Country Status (3)

Country Link
EP (1) EP0700062B1 (de)
DE (1) DE69508680T2 (de)
SE (1) SE9402970L (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2758916B1 (fr) * 1997-01-30 1999-04-02 Gec Alsthom T & D Sa Capot pare effluves
DE19757403A1 (de) * 1997-12-16 1999-07-01 Siemens Ag Kontaktlamelle für ein Kontaktstück eines Hochspannungsschalters und Kontaktlamellenanordnung
CH693548A5 (de) * 1997-12-18 2003-09-30 Siemens Ag Gasisolierte Hochspannungsschaltanlage mit einer Trennschaltstrecke.
DE102005019424A1 (de) * 2005-04-25 2006-11-02 Abb Technology Ag Lasttrennschalter
EP2797095B1 (de) * 2013-04-22 2015-11-04 ABB Technology AG Tulpenkontakt für einen Leistungsschalter
CN104319157B (zh) * 2014-11-20 2016-08-24 河南平高电气股份有限公司 隔离开关
CN106024436B (zh) * 2016-06-30 2018-09-14 平高集团有限公司 屏蔽罩及使用该屏蔽罩的触指组件和断路器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1790063A1 (de) * 1968-09-04 1971-12-02 Calor Emag Elektrozitaets Ag Elektrische Kontaktanordnung
DE1913969C3 (de) * 1969-03-14 1980-05-08 Siemens Ag, 1000 Berlin Und 8000 Muenchen Hochspannungs-Leistungsschalter
JPS5612973B2 (de) * 1972-06-12 1981-03-25
CH645204A5 (de) * 1979-05-25 1984-09-14 Bbc Brown Boveri & Cie Elektrischer schalter fuer grosse stroeme.
DE4227007A1 (de) * 1992-08-14 1994-02-17 Dunkel Otto Gmbh Rundkontaktbuchse

Also Published As

Publication number Publication date
DE69508680T2 (de) 1999-11-11
SE9402970D0 (sv) 1994-09-05
DE69508680D1 (de) 1999-05-06
EP0700062A1 (de) 1996-03-06
SE9402970L (sv) 1996-03-06

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