US3801764A - Electrical contact for high voltage power circuit current - Google Patents

Electrical contact for high voltage power circuit current Download PDF

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Publication number
US3801764A
US3801764A US00344045A US3801764DA US3801764A US 3801764 A US3801764 A US 3801764A US 00344045 A US00344045 A US 00344045A US 3801764D A US3801764D A US 3801764DA US 3801764 A US3801764 A US 3801764A
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US
United States
Prior art keywords
electrode
mounting member
electrical contact
constructed
recited
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
US00344045A
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English (en)
Inventor
K Rolff
P Huhse
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
Priority claimed from DE19722215883 external-priority patent/DE2215883C3/de
Application filed by Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of US3801764A publication Critical patent/US3801764A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01H33/7069—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by special dielectric or insulating properties or by special electric or magnetic field control properties
    • 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
    • H01H33/7061—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by use of special mounting means

Definitions

  • an improved electrical contact comprising a conductive base member, a conductive mounting member disposed in and electrically coupled to the base member, and a conductive electrode, disposed in the mounting member.
  • the mounting member supports the electrode on the contact and is constructed of an electrically conductive composition which has a coefficient of thermal expansion similar to that of the electrode. Thermal stress resulting from heating of the electrode and mounting member by current arcs remains approximately constant over a specified temperature range, and damage caused thereby is prevented.
  • the invention relates generally to electrical power circuit interrupters, and, in particular, to a dielectric gas-filled, high voltage power circuit current interrupter apparatus utilizing improved electrical contacts which are resistant to fractures andother damage caused by thermal stress produced by. arcing currents during interruption of the current flow through the apparatus.
  • the graphite contacts used are generally solid members which are slideably disposed in cup-shaped electrodes, and are usually formed in two portions with the outer diameter of one portion being greaterrthan the outer diameter of the other so that the larger portion overlaps the edge of the electrode, and provides a secure mechanical and electrical connection therebetween.
  • German patent 1,488,904 also discloses a switchingdeviceutilizinggraphite electrodes.
  • a high voltage power circuit current interrupter apparatus which is filled with a dielectric gaseous insulatingand arc extinguishing medium.
  • the improvedcontact comprises an electrically conductive base member having an opening in one end thereof, in which an electri- 2- cally conductive mounting member, having openings in itsends, is slideably disposed.
  • An electrically conductive electrode is disposed in one end 'of the mounting member.
  • the mounting member conducts the current flowing between the bridge of the apparatus and the electrical contacts, including arc currents which flow during interruption of the electrical power, and the material of which it is constructed is chosen to have a coefficient of expansion whose characteristics are similar to that of the electrode, which causes the mounting member to expand during current arcing with the electrode disposed therein so that expansion of the electrode is not restricted by the mounting member, and the thermal stress exerted on the electrode remains constant despite the excessive heating of the electrode.
  • FIG. 1 is a partial sectional view of a high voltage, gas-filled, power circuit current interruption apparatus including improved electrical contacts constructed according to the invention
  • FIG. 2 is an exploded, partial sectional view of'the composite structural elements comprising an improved electrical contact constructed according to the'inven tion.
  • the improved electrical contact comprises a hollow conductive'base member, in which a hollow conductive mounting member is slideably disposed for supporting a hollow conductive electrode on .the end of the base member.
  • the electrode has a known coefficient of thermal expansion and includes a tapered longitudinal bore which forms a nozzle and vents gases generated by current arcing from the current interrupter apparatus.
  • the mounting member is constructed of an electrically conductive metallic composition having a coefficient of expansion which has characteristics similar to that of the electrode. Specifically, if the electrode is constructed of graphite, the mounting member may, for example, be constructed of a metallic composition consisting of about 36 percent nickel and about 64 percent iron, an iron alloy known as Invar.
  • the annular mounting may also be constructed of an electrically conductive metallic composition consisting of about 28 percent nickel, about 18 percent cobalt, and
  • FIG. 1 there is shown a high voltage, gas-filled power circuit current interrupter which includes a housing 10, constructed ofdielectric material, such as, for example, porcelain.
  • a dielectric gaseous medium such as, for example,'sulfur hexafluoride, is disposed in the interior space'12 of housing 10.
  • a pair of oppositely disposed electrical contacts are disposed within housing 10, and include hollow, electrically conductive base members 1 having openings in the endsthereof.
  • At least one electrically conductive bridge 11 disposed longitudinally in housing adjacent base members 1 engages the base members. Bridge 11 spans the gap therebetween and conducts current flowing between the contacts in the circuit interrupter.
  • FIG. 1 On the right side of FIG.
  • bridge 11 is shown in its electrically conductive position; on the left side of FIG. l, bridge 11 is shown in its current interruption position. It should be noted that alternative positions of a pair of bridges for the circuit interrupter have been illustrated in FIG. 1, and that during operation of such a current interrupter having a pair of conductive bridges both would be disposed in corresponding positions on each side of the electrical contacts.
  • An electrically conductive, hollow annular mounting member 4 is slideably disposed within each 1 of base members 1, and supports an electrically conductive electrode 6 which may, for example, be constructed of graphite.
  • the electrode includes a tapered longitudinal bore which forms a nozzle for venting gases generated during current arcing between base members 1 from interior space 12 'of housing 10.
  • FIG. 2 illustrates base member 1, mounting member 4', and-electrode'6 of the circuit interrupter in detail.
  • Base memberl is a tubular cylinder, and is provided at its end face 2 with a longitudinal, internal thread 3.
  • Annular mounting member 4 includes upper and lower portions having "different diameters, the lower portion having a smaller diameter than the upper portion thereof and including external threads on the outside surface thereof which are slideably received by internal thread 3 of the base member 1.
  • Electrode 6 is slideably disposed in, and frictionally engaged by, mounting member 4, and is thereby secured on the base member.
  • Electrode 6 is also provided with upper and lower portions having different diameters.
  • Upper portion 7 has a diameter which is slightly greater than the inside diameter of mounting member 5; specifically, outside diameter D of electrode 6' is about 0.1 to about 0.5 percent greater than the inside diameter d of the mounting achieved.
  • the thickness of the walls of annular member 4 are made relatively thin so that the member is elastic and thermal stresses generated by current areing, which cause different thermal expansions of the electrode, are elastically absorbedby annular mounting member 4.
  • the metallic composition may comprise 36 percent nickel and 64 percent iron. This composition is able to withstand frictional forces generated by thermal stress acting on the electrode over a temperature range up to approximately 200C. Above that temperature, the thermal stress forces produced become significantly less. For much higher thermal stresses, particularly for temperatures which range above 400C, a conductive composition comprising 28 percent nickel, 18 percent cobalt and 54 percent iron is preferable.
  • Such a metallic composition characteristically expands with increases in temperature up to approximately 400C, in a manner which for the most part corresponds to the expansion of the graphite electrodes over the same temperature range.
  • Mounting of a graphite electrode on the base member of the contact by means of such a mounting member, consisting of one of the foregoing compositions ensures both good electrical and mechanical coupling of the electrode to the base member, while at the same time assuring that excessive thermal stress is not applied to the graphite electrode by the mounting member securing it to the base member.
  • a mounting structure for mounting a graphite electrode on an electrical contact,-which is damage resistant over a wide range of temperatures, is thereby provided.
  • the dielectric gas disposed in interior space 12 of housing 10 is suppliedthereto from a pressurized source (not shown) at a specific pressure, preferably 16 kg/cm
  • the gas serves both'as a quenching medium for extinguishing current arcs'flowing between the base members and as an insulator.
  • bridge 11 When bridge 11 is moved to its non-conductive'position, as the electrical power flowing through the circuit interrupter is interrupted, a current are flows from base member 1 to bridge 11.
  • the mounting member conducts the current flowing through the circuit interrupter, and also conducts any the' are burning from the mounting member to the bridge is rapidly extinguished.
  • an improved electrical contact comprising a base member having an opening in at least one end thereof;
  • a mounting member including an opening in at least one end thereof, disposed in one end of said base member;
  • an electrode slidably disposed in and frictionally engaging the other end of said mounting member.
  • said mounting member is constructed of an electrically conductive metallic composition consisting of about 36 percent nickel and about 64 percent iron, and wherein said electrode is constructed of graphite.
  • said mounting member is constructed of an electrically conductive metallic composition consisting of about 28 percent nickel, about 18 percent cobalt and about 54 percent iron, and wherein said electrode is constructed of graphite.
  • said electrode includes upper and lower portions of different diameters, the outside diameter of the upper portion of said electrode being about 0.1 to about 0.5 percent greater than the inside diameter of said mounting member and the outside diameter of the lower portion of said electrode at room temperature, said lower portion of said electrode being disposed in said mounting member for mounting said electrode therein.
  • said mounting member comprises a thin elastic annular wall of metallic material, expansion of said electrode against said mounting member in response to heating by current arcing being elastically absorbed by said mounting member wall.
  • said mounting member is constructed of an electrically conductive metallic composition consisting of steel type ST 35, and wherein said electrode is constructed of graphite.

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  • Circuit Breakers (AREA)
  • Contacts (AREA)
US00344045A 1972-03-28 1973-03-22 Electrical contact for high voltage power circuit current Expired - Lifetime US3801764A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722215883 DE2215883C3 (de) 1972-03-28 Kontaktsystem für elektrische Hochspannungsgeräte mit einem gasförmigen Isollermittel, Insbesondere Hochspannungs-Leistungsschalter

Publications (1)

Publication Number Publication Date
US3801764A true US3801764A (en) 1974-04-02

Family

ID=5840783

Family Applications (1)

Application Number Title Priority Date Filing Date
US00344045A Expired - Lifetime US3801764A (en) 1972-03-28 1973-03-22 Electrical contact for high voltage power circuit current

Country Status (7)

Country Link
US (1) US3801764A (xx)
JP (1) JPS579166B2 (xx)
CH (1) CH565440A5 (xx)
FR (1) FR2177724B1 (xx)
GB (1) GB1419891A (xx)
IT (1) IT981648B (xx)
SE (1) SE387005B (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6031446A (en) * 1999-03-09 2000-02-29 Eaton Corporation Combination fuse clip and line terminal connection device
US6116966A (en) * 1998-04-17 2000-09-12 Ati Industrial Automation, Inc. High power electrical contacts for robotic tool changer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS644200Y2 (xx) * 1979-05-28 1989-02-03

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1491851A (fr) * 1965-09-10 1967-08-11 Siemens Ag Disjoncteur à gaz comprimé
DE1269230B (de) * 1966-11-03 1968-05-30 Bbc Brown Boveri & Cie Anordnung zum Sichern eines mittels Gewinde mit einem Tragteil verbundenen Kontaktstueckes
DE1965853A1 (de) * 1969-12-19 1971-06-24 Siemens Ag Druckkammerschalter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1491851A (fr) * 1965-09-10 1967-08-11 Siemens Ag Disjoncteur à gaz comprimé
DE1269230B (de) * 1966-11-03 1968-05-30 Bbc Brown Boveri & Cie Anordnung zum Sichern eines mittels Gewinde mit einem Tragteil verbundenen Kontaktstueckes
DE1965853A1 (de) * 1969-12-19 1971-06-24 Siemens Ag Druckkammerschalter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6116966A (en) * 1998-04-17 2000-09-12 Ati Industrial Automation, Inc. High power electrical contacts for robotic tool changer
US6031446A (en) * 1999-03-09 2000-02-29 Eaton Corporation Combination fuse clip and line terminal connection device

Also Published As

Publication number Publication date
JPS579166B2 (xx) 1982-02-19
SE387005B (sv) 1976-08-23
DE2215883B2 (de) 1976-10-21
IT981648B (it) 1974-10-10
JPS497763A (xx) 1974-01-23
FR2177724A1 (xx) 1973-11-09
FR2177724B1 (xx) 1976-05-14
GB1419891A (en) 1975-12-31
DE2215883A1 (de) 1973-10-11
CH565440A5 (xx) 1975-08-15

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