US3657504A - High tension metal clad switches including plug and socket contacts for eliminating strong electrical field concentrations - Google Patents

High tension metal clad switches including plug and socket contacts for eliminating strong electrical field concentrations Download PDF

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Publication number
US3657504A
US3657504A US67921A US3657504DA US3657504A US 3657504 A US3657504 A US 3657504A US 67921 A US67921 A US 67921A US 3657504D A US3657504D A US 3657504DA US 3657504 A US3657504 A US 3657504A
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US
United States
Prior art keywords
disc
cavity
switch
rod
metal
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
US67921A
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English (en)
Inventor
Rintje Boersma
Gijsbert Waldemar Irk
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.)
COQ NV
Original Assignee
COQ NV
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Filing date
Publication date
Application filed by COQ NV filed Critical COQ NV
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Publication of US3657504A publication Critical patent/US3657504A/en
Anticipated expiration legal-status Critical
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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
    • H01H33/24—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear

Definitions

  • ABSTRACT 1n a metal clad switch for high voltage comprising cooperating contacts to close and to open the circuit, of which one of said contacts is a bushing contact, the provision of a movable metal disc in the cavity of said bushing contact, said disc being forced by a spring in a position, in which it lies flush with the edge of said cavity, when the switch is in its open condition in order to eliminate the unfavourable influence of the edge of said cavity on the electric field set up in the switch when the latter is alive.
  • the invention relates to a metal clad switch for high voltage, comprising at least one bushing contact and an axially movable switching rod cooperating therewith, said switching rod penetrating partly the cavity of said bushing contact, when the switch is in its closed condition.
  • the invention has for its object to provide a switch, especially an isolator switch, in which the disadvantage referred to is avoided. It is to be seen in that provided in the cavity of the bushing contact is a spring loaded movable metal disc adapted to move in a direction at right angles to its plane and held, in the open condition of the switch, by said spring and a stop member in a position, in which it forms with its surface facing the switching rod a continuation of the edge surface of said cavity and nearly closes the latter, and, in the closed condition of the switch, by the switching rod in a place located deeper within said cavity. Due to said disc the bushing contact or the body, in which the bushing contact is mounted, obtains a nearly uninterrupted surface when the switch is in its open position.
  • the switch is constructed in such a manner that at least in the open condition of the switch the disc is electrically conductively connected with the bushing contact and in the closed condition of the switch the current part from the switching rod through the disc to the bushing contact is interrupted by an insulating part.
  • the disc has the potential of the bushing contact when the switch is in its open condition but there will not be produced a parallel current path in the bushing contact through the disc, when the switch is closed.
  • a parallel current path which is unsuitable to conduct current, can lead to serious disturbances.
  • the disc may have a smaller diameter than the cavity of the bushing contact and may be mounted for movement over a metal rod extending in the axis of the cavity and electrically conductively connected with the bushing contact, said rod being provided at its free end with a stop flange and in the place, in which the disc is located in the closed condition of the switch, with an insulating layer, whereas the spring may contact at least with one of its ends an insulating layer.
  • the disc may have a smaller diameter than the cavity of the bushing contact and may be mounted for movement over a metal rod extending in the axis of the cavity and electrically conductively connected with the bushing contact, said rod being provided at its free end with a stop flange and in the place, in which the disc is located in the closed condition of the switch, with an insulating layer, whereas the spring may contact at least with one of its ends an insulating layer.
  • FIG. 1 an axial sectional view of a part of an isolator switch in its open condition, the bushing contact thereof being constructed in accordance with the invention
  • FIG. 2 the isolator switch shown in FIG. 1, when it is in its closed condition
  • FIG. 3 an axial sectional view of a variant of the bushing contact shown in FIGS. 1 and 2, when the isolator switch is in its closed condition.
  • an electrically conductive spherical junction body for the connection of a bus bar 2 to an isolator switch is designated by 1.
  • the spherical junction body is insulatedly and centrally mounted in a metal envelope 3 which is to be connected with earth and has, in the region of said body, a spherical inner wall.
  • the junction body I is provided with a radial cavity 4, in which fixed annular contacts 5 are provided. These annular contacts 5 cooperate with the axially movable switching rod 6 of an isolator switch. Consequently, the junction body I with the cavity and the annular contacts 5 form together the fixed bushing contact of said isolator switch.
  • a metal disc 7 adapted to be moved at right angles to its plane over a composite rod extending in the axis of said cavity and consisting of a bushing 10 of insulating material which is connected by a central bolt 8 to a metal cup 9 fixed to the bottom of the cavity 4 and of a coaxial metal bushing 11 provided with a stop flange 12.
  • a spring 13 which is insulated from the cup 9 by a ring 14 of insulating material.
  • the disc 7 In the open condition of the isolator switch (FIG. 1) the disc 7 lies with its surface facing the switching rod flush with the plane through the end of the cavity 4, so that the disc 7 forms a continuation of the surface of the junction body 1.
  • the disc 7, of which the diameter is smaller than that of the cavity 4 is then electrically conductively connected with the junction body 1 through the bushing 11, the bolt 8 and the cup 9, so that it has the same potential as the body 1. Then, the edge of the cavity 4 cannot affect the electric field.
  • the rod 15, on which the disc is movably mounted is integral with the cup 9 and the stop for the disc is formed by the head of a bolt 16.
  • the surface of the disc 7 facing the switching rod 6 is provided with a thin layer of insulating material 17, so that there cannot be any metal contact between the disc 7 and the switching rod.
  • a metal clad switch for high voltage comprising at least one bushing contact, a cavity provided in said contact, an axially movable switching rod cooperating with said bushing contact and extending partly in said cavity when the switch is in its closed condition, a movable metal disc provided in said cavity of the bushing contact and adapted to move in the direction of the axis of the switching rod and at right angles to its plane, a spring forcing said disc towards the open end of said cavity, a stop member, said spring and said stop member holding said disc in a position, in which it lies with its surface facing the switching rod substantially flush with the edge plane of said cavity and substantially closes said cavity, when the switch is in its open position, said disc being held by the switching rod in a place located deeper in said cavity, when the switch is in its closed position, and at least one insulating member which so cooperates with said disc as to interrupt, at least in the closed condition of the switch, the electrically conductive path extending between the switching rod and the bushing contact through said disc.
  • said switch including:
  • an electrically conducting body having a cavity; an electrically conductive switching rod movable between an open position in which it is spaced from said body and a closed position in which it projects partially into said cavity in electrical contact with said body; an earthed electrically conductive envelope enclosing said body and said switching rod whereby a strong concentration of electric field tends to set up between the edge region of said body surrounding said cavity and said envelope when said switching rod is in its open position; means for eliminating said strong concentration of electric field and including a metal disc disposed in said cavity, a rod fixed to said body and projecting axially within said cavity to guide said disc and having at least an exposed end portion which provides a stop for said disc and which is in electrical connection with said body, and means for normally urging said disc into engagement with said stop to position said disc substantially flush with said edge region of said body when said switching rod is in its open position and to allow said disc to be pushed into said cavity by said switching rod when the latter is moved to its closed position;
  • said insulating means comprises a layer of insulating material on that side of said disc facing said switching rod.
  • said insulating means comprises an annular member of insulating material seated upon said cup and a bushing of insulating material surrounding said rod adjacent said cup, and said means for urging said disc comprises a spring disposed between said disc and said annular member of insulating material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Contacts (AREA)
  • Trip Switchboards (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US67921A 1969-11-05 1970-08-28 High tension metal clad switches including plug and socket contacts for eliminating strong electrical field concentrations Expired - Lifetime US3657504A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6916683A NL6916683A (enrdf_load_stackoverflow) 1969-11-05 1969-11-05

Publications (1)

Publication Number Publication Date
US3657504A true US3657504A (en) 1972-04-18

Family

ID=19808316

Family Applications (1)

Application Number Title Priority Date Filing Date
US67921A Expired - Lifetime US3657504A (en) 1969-11-05 1970-08-28 High tension metal clad switches including plug and socket contacts for eliminating strong electrical field concentrations

Country Status (10)

Country Link
US (1) US3657504A (enrdf_load_stackoverflow)
JP (1) JPS5135714B1 (enrdf_load_stackoverflow)
AT (1) AT295641B (enrdf_load_stackoverflow)
BE (1) BE758254A (enrdf_load_stackoverflow)
CA (1) CA926454A (enrdf_load_stackoverflow)
DE (1) DE2008613B1 (enrdf_load_stackoverflow)
FR (1) FR2069022A5 (enrdf_load_stackoverflow)
GB (1) GB1287987A (enrdf_load_stackoverflow)
NL (2) NL6916683A (enrdf_load_stackoverflow)
SE (1) SE371550B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1996688B (zh) * 2005-12-09 2010-11-03 通用电器（加拿大）公司 绝缘装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5362006A (en) * 1976-11-17 1978-06-03 Hitachi Ltd Sealer device for steam turbine low pressure wheel chamber
NL168080C (nl) * 1977-04-19 1982-02-16 Coq Bv Scheidingsschakelaar voor hoge spanning.
JPS5856280U (ja) * 1981-10-12 1983-04-16 片山　裕 フランジ管継手
DE3211860A1 (de) * 1982-03-31 1983-10-06 Calor Emag Elektrizitaets Ag Trennschaltanordnung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE592265C (de) * 1934-02-05 Siemens Schuckertwerke Akt Ges Schalter mit einer leitenden Schaltfluessigkeit
US2298859A (en) * 1939-11-13 1942-10-13 Reyrolle A & Co Ltd Alternating current electric circuit breaker
US2813179A (en) * 1954-10-04 1957-11-12 Westinghouse Electric Corp Disconnecting switch
US3110791A (en) * 1959-08-27 1963-11-12 Westinghouse Electric Corp Circuit interrupter with pressure-generating and interrupting contacts in insulating interrupting tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE592265C (de) * 1934-02-05 Siemens Schuckertwerke Akt Ges Schalter mit einer leitenden Schaltfluessigkeit
US2298859A (en) * 1939-11-13 1942-10-13 Reyrolle A & Co Ltd Alternating current electric circuit breaker
US2813179A (en) * 1954-10-04 1957-11-12 Westinghouse Electric Corp Disconnecting switch
US3110791A (en) * 1959-08-27 1963-11-12 Westinghouse Electric Corp Circuit interrupter with pressure-generating and interrupting contacts in insulating interrupting tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1996688B (zh) * 2005-12-09 2010-11-03 通用电器（加拿大）公司 绝缘装置

Also Published As

Publication number Publication date
NL6916683A (enrdf_load_stackoverflow) 1971-05-07
CA926454A (en) 1973-05-15
FR2069022A5 (enrdf_load_stackoverflow) 1971-09-03
AT295641B (de) 1972-01-10
BE758254A (nl) 1971-04-01
GB1287987A (enrdf_load_stackoverflow) 1972-09-06
JPS5135714B1 (enrdf_load_stackoverflow) 1976-10-04
DE2008613B1 (enrdf_load_stackoverflow) 1971-08-26
NL136432C (enrdf_load_stackoverflow)
SE371550B (enrdf_load_stackoverflow) 1974-11-18

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