US3925631A - Contact arrangement for a high-voltage power circuit breaker - Google Patents

Contact arrangement for a high-voltage power circuit breaker Download PDF

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Publication number
US3925631A
US3925631A US353365A US35336573A US3925631A US 3925631 A US3925631 A US 3925631A US 353365 A US353365 A US 353365A US 35336573 A US35336573 A US 35336573A US 3925631 A US3925631 A US 3925631A
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US
United States
Prior art keywords
contact
electrodes
electrode
contact pieces
supplement
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Expired - Lifetime
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US353365A
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English (en)
Inventor
Claus Kessler
Helmut Beier
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Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
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Publication of US3925631A publication Critical patent/US3925631A/en
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    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7076—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by the use of special materials
    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7038—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by a conducting tubular gas flow enhancing nozzle
    • H01H33/7053—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by a conducting tubular gas flow enhancing nozzle having a bridging element around two hollow tubular contacts

Definitions

  • a contact arrangement for a high voltage power circuit breaker wherein compressed gas is blown through the are developed when the breaker is switched.
  • the contact arrangement includes at least two contact pieces having respective hollow interiors for accommodating the discharge of the gas blown through the arc.
  • Arcing electrodes between which the arc is drawn when the breaker is switched to the open position are electrically and mechanically joined to the contact pieces respectively.
  • Each arcing electrode and the corresponding contact piece conjointly define an interface whereat the arc electrode is joined to the electrode piece.
  • An electrically conductive supplement is contained in the electrodes in the region thereof next to the interface.
  • the supplement comprises at least one metal and the arcing electrodes are made of carbon bodies and have a nozzle-like configuration.
  • the contact arrangement of the invention increased mechanical strength is imparted to the graphite electrode and large differences in conductivity at the interface are obviated.
  • the contact arrangement according to the invention is utilized in high voltage power circuit breakers, especially those of the compressed gas type,-and is provided where the breaker is switched between open and closed positions.
  • the contact arrangement includes asa feature at least two contact pieces having respective hollow interiors for accommodating the discharge of the gas blown through the arc.
  • Arcing electrodes between which the arc is drawn when the breaker is switched to the open position are electrically and mechanically joined to respective ones of thecontact pieces.
  • Each arcing electrode and the corresponding contact piece conjointly define an interface whereat the arcing electrode is joined'to the contact piece.
  • the arcing electrodes are made from carbon bodies and have a nozzlelike configuration.
  • An electrically conductive supplement is contained in each of the electrodes in the region thereof next to interface and the supplement comprises one or more metals.
  • the metallic supplements can be embedded in the graphite body, for example, by sintering and impart a comparably higher mechanical strength which makes it possible to stress the graphite body to a higher degree, for instance, where the electrode is joined to the contact piece.
  • the metallic supplements effect an increase in the conductivity of the graphite body, and this is advantageousparticularly in an embodiment of the invention wherein the hollow contact pieces are arranged so as to be stationary and can be bridged by a bridging contact member which, in the course of the interrupting motion, slides over the arcing electrode of at least one of the stationary contact pieces.
  • the electric conductivity of the sliding surface of the electrodes can be matched to the conductivity of the contact pieces through an appropriate choice of the concentration of the added metals so that the influence of discontinuities is thereby decreased. It is particularly advantageous if the area of the arcing electrode over which the bridging contact member travels has the highest concentration of the added metal. The wear of the sliding surface of the electrodes, caused by the movement of the contact fingers of the bridging contact member is moreover, reduced or avoided by the metal addition.
  • the outer surface of the graphite body is provided with the metal supplement.
  • a blasting arrangement consisting of a piston and a cylinder.
  • the inside surface of the graphite body is provided only in part with a metallic supplement.
  • the arc is drawn in the course of the interrupting motion into the region of the interior of the contacts which has a beneficial effect on'the quenching conditions.
  • the regions of the contact bodies at the mounting surfaces are advantageously determined for the metallicelectric connection with the contact pieces.
  • FIG. 1 is a schematic diagram partially in section of thecontact arrangement according to the invention.
  • the contact arrangement constitutes part of a highvoltage circuit breaker, especially one of thecompressed-gas type.
  • the left half of the diagram shows the equipped with anauxiliary contact.
  • the high-voltage power circuit breaker shown in FIG. 1 comprises a switching chamber 1 which can be of porcelain for example.
  • a gaseous insulating medium such as sulfur hexafluoride is under a pressure of bar for example.
  • the contact pieces 3, 4 are made hollow for the removal of switching gases whereas the arcing electrodes 5, 6 are graphite bodies of nozzle-shaped configuration. The hot switching gases generated during the arcing period are passed on through the nozzle-shaped graphite bodies 5, 6 into the interior of the hollow contact pieces 3, 4.
  • the breaker On the left side of the center-line 7, the breaker is in the open position, and to the right of the center line 7, in the closed position.
  • the two contact pieces 3, 4 are electrically connected witheach other by a bridging contact member 8.
  • the gap between the two contact pieces 3 and 4 is opened by the bridging contact member 8 which had been moved in the direction of the arrow 9.
  • the gaseous quenching medium is conducted under a predetermined pressure, for example, 10 bar, to the gap and discharged from there through the hollow contact pieces 3 and 4.
  • FIG. 2 an enlarged view-of the arcing electrode 5 with its corresponding contact piece 3.
  • The'bridging contact member 8 is shown in a position through which the member passes in the course of the interrupting motion.
  • the graphitebody constituting the arcing electrode has an electrically conductive supplement 11 comprising of one or several metals; this supplement 11 is provided at the location 10 where the arcing electrode is electrically-mechanically connected with the contact piece 3.
  • the metal supplement 11 increases the mechanical strength of the graphite electrode 5 to the extent that a sufficiently strong connection between the graphite electrode and the contact piece 3 is possible,
  • the electrically conductive metallic supplement effects an increase of the electric conductivity of the graphite electrode primarily in the region of the outer surface 13 slideably engaged by the bridging contact member 8 during the interrupting motion of the contact fingers (not shown) of the bridging contact member is at the same time reduced or avoided.
  • FIGS. 1 and 2 In the position shown wherein the bridging contact member 8 is already electrically separated from the graphite body 5, an arc is drawn which is driven into the interior of the graphite body 5 under the influence of the gas stream which is building up.
  • the footpoint of the arc travels across the surfaces 15 of the graphite body consisting preferably of pure graphite.
  • the embodiment shown in FIGS. 1 and 2 has stationary contact pieces 3, 4 which can be bridged by a bridging contact member 8 which is preferably of tubular configuration and slides over the arcing electrode of at least one of the stationary contacts in the course of the interrupting motion.
  • the bridging contact member 8 then surrounds the stationary contact pieces 3, 4 for which the outer surface region of the graphite bodies 5 and 6 are provided with the metal supplement.
  • the bridging contact member 8 is provided with a tubular burn-off auxiliary contact 8a which is slideably guided in the interior 16 of the hollow contact pieces 3, 4.
  • auxiliary contact is described, for example, in the copending application Ser. No. 337,174, filed on Mar. 1, 1973 with the title: Compressed-Gas Circuit Breaker.
  • the inner surface of the graphite bodies 5,6 is provided in part with a metal supplement.
  • the mounting portions 17 provided at the contact pieces 3 and 4 for the respective graphite bodies 5, 6 also have a metal supplement which in addition to being advantageous for the mechanical connection, is advantageous for the electric-metallic connection with the contact pieces.
  • metals used as the metal supplements are copper, silver and alloys with copper orsilver.
  • a contact arrangement whereat the circuit breaker is switched between open and closed positions, the contact arrangement comprising at least two metal contact pieces having respective hollow interiors for accommodating the discharge of the gas blown through the arc, arcing electrodes between which the arc is drawn when the breaker is switched to the open position, said contact pieces being mounted in the breaker so as to conjointly define a gap therebetween, and a bridging contact member movable relative to said contact pieces between open and closed positions to electrically join said contact pieces in the closed position and to electrically separate said contact pieces in the open position whereby the arc is drawn when said gap is'opened, said bridging contact member being arranged with respect to said contact pieces so as to cause said bridging contact member to slide over the electrode of at least one of said contact pieces when moving into said open position from said closed position, said arcing electrodes being electrically and mechanically joined to said contact pieces respectively, each of said
  • said bridging contact member having a tubular configuration and being arranged in surrounding relation to the contact pieces, said region of said electrodes containing the metal supplement extending to the outer surface of the electrode.

Landscapes

  • Circuit Breakers (AREA)
  • Contacts (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US353365A 1972-04-28 1973-04-23 Contact arrangement for a high-voltage power circuit breaker Expired - Lifetime US3925631A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2221630A DE2221630B2 (de) 1972-04-28 1972-04-28 Kontaktsystem für Hochspannungs-Leistungsschalter

Publications (1)

Publication Number Publication Date
US3925631A true US3925631A (en) 1975-12-09

Family

ID=5843940

Family Applications (1)

Application Number Title Priority Date Filing Date
US353365A Expired - Lifetime US3925631A (en) 1972-04-28 1973-04-23 Contact arrangement for a high-voltage power circuit breaker

Country Status (8)

Country Link
US (1) US3925631A (pt)
JP (1) JPS564005B2 (pt)
CH (1) CH547006A (pt)
DE (1) DE2221630B2 (pt)
FR (1) FR2181699B1 (pt)
GB (1) GB1401111A (pt)
IT (1) IT983973B (pt)
SE (1) SE389761B (pt)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH594973A5 (pt) * 1975-05-28 1978-01-31 Bbc Brown Boveri & Cie
JPS5856176U (ja) * 1981-10-09 1983-04-16 電気化学計器株式会社 プランジヤポンプ
DE3434083A1 (de) * 1984-09-17 1986-03-27 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Leistungskontaktelement fuer hochspannungs-leistungsschalter
EP0205897B1 (de) * 1985-06-24 1991-10-16 BBC Brown Boveri AG Abbrandkontaktstück und Verfahren zur Herstellung eines solchen Abbrandkontaktstückes oder eines vergleichbaren Bauteils

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2365132A (en) * 1941-09-25 1944-12-12 Reyrolle A & Co Ltd Electric circuit breaker of the gas-blast type

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2319240A (en) * 1940-03-19 1943-05-18 Mallory & Co Inc P R Electric contact and the like

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2365132A (en) * 1941-09-25 1944-12-12 Reyrolle A & Co Ltd Electric circuit breaker of the gas-blast type

Also Published As

Publication number Publication date
GB1401111A (en) 1975-07-16
DE2221630B2 (de) 1979-05-23
DE2221630A1 (de) 1973-11-15
JPS564005B2 (pt) 1981-01-28
JPS4954867A (pt) 1974-05-28
FR2181699A1 (pt) 1973-12-07
IT983973B (it) 1974-11-11
SE389761B (sv) 1976-11-15
CH547006A (de) 1974-03-15
FR2181699B1 (pt) 1977-02-04

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