US3873793A - Contact system for a high-voltage apparatus - Google Patents

Contact system for a high-voltage apparatus Download PDF

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Publication number
US3873793A
US3873793A US366295A US36629573A US3873793A US 3873793 A US3873793 A US 3873793A US 366295 A US366295 A US 366295A US 36629573 A US36629573 A US 36629573A US 3873793 A US3873793 A US 3873793A
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US
United States
Prior art keywords
annular member
support member
contact
contact system
contact piece
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
US366295A
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English (en)
Inventor
Klaus-Peter Rolff
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
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Publication of US3873793A publication Critical patent/US3873793A/en
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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
    • H01H33/70—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 system for an electrical high-voltage apparatus or the like such as a high-voltage power circuit breaker or the like wherein a gaseous insulating me- [330] Forelgn Application Pnomy Data dium is used includes a contact system having at least June 1972 Germany 2232314 one contact piece.
  • the contact piece includes an electrically conductive annular member having respective [52] US. (,l. 200/148 R, 200/146 R end portions o of the end portions Carries a graph [51] int. Cl.
  • H6lh 33/82 ite electrode having a nOZZkHike Configuration for Fleld 0f Search R, G, D, d ti away the gases produced when the appara- 200/146 R tus is switched to the open position.
  • the contact piece is also provided with support member having a free [56] References C'ted end portion.
  • the other end-portion of the annular UNITED STATES PATENTS member surrounds and engages the free end-portion 2.364.981 12 1944 Journeaux 200/146 R of th upp rt m mber to form a shrink-joim there- 3 789.l75 1/1974 Beier et al ZOO/I48 R with and thereby establishes a good electrical connec- FOREIGN PATENTS OR APPLICATIONS between these members- 525244 8/1940 United Kingdom 200/148 G 6 Claims, 2 Drawing Figures oh. W;
  • the invention relates to an electrical high-voltage ap paratus, and in particular, high-voltage circuit breakers of the kind disclosed in Deutsche Auslegeschrift 1,154,548 for example.
  • the electric circuit breaker disclosed in this publication operates with an electronegative, fluorine-containing gas as the quenching and insulating medium and includes two contact pieces which are movable relative to each other and across which an arc is drawn when the breaker is opened.
  • the contact pieces are made of carbon, preferably graphite, in order to keep the destruction of the contact pieces and the formation of decomposition products low under the action of the are.
  • the contact pieces consist ing of graphite are solid and are inserted into cupshaped electrodes. The walls of the cup-shaped electrodes engage at least partially in undercuts on the periphery of the contact pieces to achieve a secure mechanical and electrical connection.
  • the contact system according to the invention can be utilized in a high voltage apparatus.
  • Each electrode of the contact system is advantageously configured in the shape of a nozzle for the removal of switching gases.
  • the electrode is surrounded and engaged by an electrically conductive annular member and forms therewith a friction fit. It is thereby possible to mount the nozzleshaped graphite in a mechanically stable manner so as to preclude breakage thereof.
  • the annular member is an intermediate member and carries the current flowing through the breaker as well as the arc current produced when the circuit is interrupted during the opening operation.
  • the annular member can in turn be connected to a corresponding contact piece support member in an electrically conducting manner.
  • the invention provides a contact system having an improved electrical connection between the annular member and the contact piece support member.
  • a shrink-joint is provided between the annular member and the free end-portion of the contact support member.
  • One endportion of the annular member carries the graphite electrode whereas, the other end-portion of the same member surrounds and engages free end-portion of the contact piece support member to form the shrink-joint therewith thereby establishing a good electrical connection between the members.
  • shrink-joint is able to withstand the high stresses produced by the temperature cycles such as occur in modern highvoltage power circuit breakers better than a threaded connection.
  • the annular member engages in a ring-shaped recess formed in the outer surface of the contact piece support member.
  • the outside diameters of the annular member and the contact piece support member beyond the region of the joint are equal to each other; this arrangement simplifies the movement of the bridging contact member which is highly stressed during the breaker opening operation.
  • the graphite electrode projects axially out from the annular member.
  • the outer diameter of the electrode is the same as the respective outerv diameters of the annular member and the contact piece support member. With this outer diameter, the electrode joins tightly with the annular member at the outer surface thereof.
  • the annular member is preferably made of a metal consisting largely of iron; whereas, the contact piece support member is made of copper.
  • FIG. 1 illustrates the contact system according to the invention.
  • the contact system is shown disposed in the switching chamber of an electric high-voltage circuit breaker.
  • the right half of the drawing to the right of the center line shows the movable bridging member in a position corresponding to the closed position of the breaker, and in the left half, the bridging member is shown for the open position of the breaker.
  • FIG. 2 is an exploded view of one contact piece of the contact system.
  • the switching chamber 10 can consist, for instance, of porcelain and can contain a gaseous insulating medium such as sulfur hexafluoride.
  • a gaseous insulating medium such as sulfur hexafluoride.
  • the contact pieces I carry respective graphite electrodes 6 at the end-face portions by means of an electrically conductive member 4.
  • the graphite electrode is of nozzle-shaped configuration and directs away the hot switching gases which are produced during the time that the arc burns. These switching gases are passed onthrough the interior of the hollow contact pieces.
  • the bridging contact member 11 is shown in a position which corresponds to the closed position of the circucit breaker.
  • the two contact pieces I are connected with each other in an electrically conducting manner by a bridging contact member 11.
  • the gap between the two contact pieces 1 is cleared by the bridging contact member which was moved in the direction of the arrow.
  • FIG. 2 is an exploded view of one of the contact pieces 1 shown in FIG. 1.
  • the contact piece is made hollow for the removal of the switching gases produced during the breaker opening operation.
  • the gaseous insulating medium used such as sulfur hexafluoridc serves at the same time as the quenching medium when the contact system is part of an electrical high-voltage apparatus such as a high-voltage power circuit breaker.
  • This quenching medium is conducted to the gap under a predetermined pressure when the breaker is switched to the open position and is removed from the gap through the hollow contact pieces 1.
  • a predeter mined pressure can be 16 bar for example.
  • the contact piece support member 1A has a ringshaped recess 3 in the region 2 of its end-face portion which receives the electrically conducting ring-shaped member 4.
  • the inside diameter d of the ring-shaped member 4 is smaller than the outside diameter D of the recessed region of the contact piece support member 1A at the end-face portion thereof.
  • the cooling of the support member 1A can, for example, take place in liquid air.
  • the inside diameter d of the ring-shaped member 4 is smaller than the outside diameter D of the recessed region of the graphite electrode 6, so that also between the graphite electrode 6 and the ring-shaped member 4 a friction fit can be established.
  • the joining of the parts 1A, 4 and 6 can take place in a single operation.
  • the outside diameters D D and D of the parts 1A, 4 and 6 are the same. Through the choice of shrink joints between the parts, it is possible to join the outer surfaces of the parts 1A, 4 and 6 tightly together.
  • the electrically conductive ringshaped member 4 of a metal consisting largely of iron with C between 0.07 and 0.15 p.c.; Si between 0.10 and 0.30 p.c.; Mn between 0.30 and 0.55 p.c.; P no more than 0.05 p.c. and S no more than0,05 p.c.
  • the ringshaped member 4 can consist of metal which is 36% nickel and the rest iron. in a still further embodiment, the ring-shaped member 4 can consist of a metal with 28% nickel, 18% cobalt and the rest iron. in all embodiments, copper is chosen as the material for the contact piece support member 1A.
  • the invention affords a good mechanical contact and an improved electrical contact between the ringshaped member 4 and the support member 1A; this good electrical and mechanical contact between members 1A and 4 is maintained also under the stress produced by hightemperature changes.
  • the ring-shaped member 4 can be arranged so that it receives, on the side supporting the graphite clcctrodc, an azimuthal stress coming close to its elastic limit at a temperature of 40C; whereas, the graphite electrode is stressed at its inner edge up to the maximum compression strength of the graphite material.
  • the side of the ring-shaped member 4 facing the contact piece support member 1A can be given such dimensions that at the highest operating temperature (for example +l20C), the ring-shaped member 4 receives an azimuthal stress approaching its elastic limit.
  • the contact pressure is preferably chosen so that also the contact piece support member 1A is stressed up to the elastic limit of the copper material in the region of the joint.
  • a contact system for an electrical high-voltage apparatus such as a high-voltage power circuit breaker or the like wherein a gaseous insulating medium is used, the contact system comprising at least one contact piece that includes a graphite electrode having a nozzle-like configuration for conducting away the gases produced when the apparatus is switched to the open position, an electrically conductive annular member having respective end-portions, said electrode being held in surrounding engagement by one of said endportions of said annular member in a friction-tight manner, and a contact piece support member having a free end-portion, the other end-portion of said annular member surrounding and engaging said free endportion of said support member to form a shrink joint therewith thereby establishing a good electrical connection between said members as well as a good mechanical connection for withstanding temperature changes occurring in the apparatus.
  • annular member being of a metal consisting largely of iron, and said annular member being made of copper.

Landscapes

  • Circuit Breakers (AREA)
  • Contacts (AREA)
  • Manufacture Of Switches (AREA)
US366295A 1972-06-27 1973-06-04 Contact system for a high-voltage apparatus Expired - Lifetime US3873793A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2232314A DE2232314C3 (de) 1972-06-27 1972-06-27 Kontaktsystem für elektrische Hochspannungsgeräte mit einem gasförmigen Isoliermittel, insbesondere Hochspannungs-Leistungsschalter

Publications (1)

Publication Number Publication Date
US3873793A true US3873793A (en) 1975-03-25

Family

ID=5849369

Family Applications (1)

Application Number Title Priority Date Filing Date
US366295A Expired - Lifetime US3873793A (en) 1972-06-27 1973-06-04 Contact system for a high-voltage apparatus

Country Status (7)

Country Link
US (1) US3873793A (ja)
JP (1) JPS579167B2 (ja)
CH (1) CH580861A5 (ja)
DE (1) DE2232314C3 (ja)
FR (1) FR2191240B2 (ja)
IT (1) IT1045363B (ja)
SE (1) SE393217B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0588709A1 (fr) * 1992-09-18 1994-03-23 Gec Alsthom T Et D Sa Disjoncteur à éléments fixes par frettage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4106642A1 (de) * 1991-02-28 1992-09-03 Siemens Ag Kontaktvorrichtung fuer hochspannungsschalter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2364981A (en) * 1942-05-16 1944-12-12 Allis Chalmers Mfg Co Electric circuit breaker and method of operating the same
US3789175A (en) * 1972-02-22 1974-01-29 Siemens Ag Electric compressed-gas circuit breaker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2364981A (en) * 1942-05-16 1944-12-12 Allis Chalmers Mfg Co Electric circuit breaker and method of operating the same
US3789175A (en) * 1972-02-22 1974-01-29 Siemens Ag Electric compressed-gas circuit breaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0588709A1 (fr) * 1992-09-18 1994-03-23 Gec Alsthom T Et D Sa Disjoncteur à éléments fixes par frettage
FR2696041A1 (fr) * 1992-09-18 1994-03-25 Alsthom Gec Disjoncteur à éléments fixés par frettage.
US5424503A (en) * 1992-09-18 1995-06-13 Gec Alsthom T&D Sa Puffer type circuit interrupter with improved blast valve and permanent contacts

Also Published As

Publication number Publication date
FR2191240A2 (ja) 1974-02-01
FR2191240B2 (ja) 1977-05-13
CH580861A5 (ja) 1976-10-15
SE393217B (sv) 1977-05-02
JPS4951565A (ja) 1974-05-18
DE2232314B2 (de) 1978-09-07
DE2232314C3 (de) 1979-05-10
JPS579167B2 (ja) 1982-02-19
IT1045363B (it) 1980-05-10
DE2232314A1 (de) 1974-01-10

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