US1733017A - Electric switch - Google Patents

Electric switch Download PDF

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Publication number
US1733017A
US1733017A US684004A US68400424A US1733017A US 1733017 A US1733017 A US 1733017A US 684004 A US684004 A US 684004A US 68400424 A US68400424 A US 68400424A US 1733017 A US1733017 A US 1733017A
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US
United States
Prior art keywords
switch
contact
rod
liquid
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
US684004A
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English (en)
Inventor
John D Hilliard
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US684004A priority Critical patent/US1733017A/en
Application granted granted Critical
Publication of US1733017A publication Critical patent/US1733017A/en
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
    • 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
    • H01H33/72—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber
    • H01H33/75—Liquid-break switches, e.g. oil-break

Definitions

  • My invention relates to electric switches of the fluid break type and an object of my invention is to provide an improved construction of switch of this type, the construction being such that the switch is adapted to be mounted on a pole for'usc as a line disconnecting switch.
  • each chamber having an upwardly extending tube of insulating material secured to it, through which extends a rod contact member when the circuit is closed and from which the rod is relatively withdrawn when the circuit is open.
  • a reservoir enclosing those parts and in communication with the chamber through a small opening therein.
  • Figure 1 is a verticalsectional view of one form of switch embodying my invention
  • Fig 2 is a similar view of another form of my invention.
  • a cross arm or other suitable support 1 carries two spaced insulators 2 and 3 upon which are mounted the stationary elements of two fluid break switch structures. As these two structures are identical in every respect, the one supported by insulator 2, only, will be described in detail.
  • a contact holder 8 is shown threaded into the portion 6 and surrounded by this holder and connected thereto is the stationary socket contact 9 which as illustrated may be of the segmental type.
  • An explosion or pressure chamber enclosing the contact 9 is formed in part by the strong metal casing 10 and the holder 8.
  • the casing 10 may be secured as shown by screw threading it to the holder 8 whereby it may be readily removed to permit inspection or removal. of the contacts 9.
  • a tube 12 of insulating material for example a phenolic condensation product such as bakelite, is secured and surrounding the casing 10 and the greater portion of the tube 12 is a vessel 13 which with the base plate 7 forms a reservoir for the are extinguishing fluid.
  • This vessel 13 which may for example be constructed of stone ware, fits snugly around the tube 12 and is shown secured to the base plate 7 by cementing it to the ring 14. bolted to the base plate.
  • the casing 10 is provided, preferably at its upper wall, with a small opening or bleed hole 15 for allowing the are extinguishing liquid to refill the chamber after each opening of the switch.
  • the top of the reservoir or vessel 13 is also provided with a small opening 16 to connect the interior of the vessel with the outside atmosphere.
  • the movable contact member of the switch shown in Fig. 1 comprises a rod 20 which is secured at its upper end to a bridge 21.
  • the tube 12 through which the rod 20 extends is preferably though not necessarily materially larger than the rod.
  • the bridge 21 carries a shield 22 having an outer flange 23 and an inner flange 24.
  • the inner flange dips into a trough 25 in the annular member 26, filled for example with oil to provide a liquid seal to prevent evaporation of the liquid in the tube 12 when a volatile liquid is used.
  • the arrangement also prevents the entrance of rain.
  • a rod 30 which may be in part or wholly of wood is provided which has sliding engagement with the bridge 21 and with an insulator 30' mounted in the sup port 1.
  • This rod is preferably square in cross section to prevent turning of the bridge 21 and has secured to it two flanges 31 and 32 and a cross arm 33.
  • a compression spring 34 is shown between the flange 31 and the bridge 21 and a pair of tension springs 35 connect the bridge 21 to the cross arm 33.
  • the contact rods 20 are preferably completely withdrawn from the tubes 12, leaving an air gap between the ends of the rods 20 and the insulating liquid.
  • each contact rod 20 is secured to a support 38 carried by an insulator 39 on a cross arm and adapted to be connected by a conductor 40 to the line.
  • the construction of the socket contact and the parts connected and related thereto are similar to those described above in connection with Fig. 1 with the exception that in this case the switch comprising contacts 27, 27, 28 and 29 are omitted and the terminals 4.- are permanently connected together by a bar 11.
  • the insulators 2 and 3 are shown bolted to across bar 42 which may be of wood and attached to this bar is shown an operating rod 43 which preferably is square and passes through a square opening in the bar or arm 44.
  • an operating rod 43 which preferably is square and passes through a square opening in the bar or arm 44.
  • the rod 43 is lowered until the rod and the socket contacts are separated and the tubes 12 are entirely withdrawn from the contact rods. In this position the socket contacts may be inspected or renewed, the reservoirs may be filled and any other needed attention given to the parts connected therewith without danger from the line and without the use of additional disconnecting switches.
  • the are extinguishing liquid is shown in both forms of the invention as nearly filling the reservoirs and may consist of oil, water, a mixture of water and glycerine or any other liquid having a fairly high dielectric strength.
  • an extremely high insulatlng property of the liquid used is not such an important consideration as it is in switches where the contact rod remains in the liquid.
  • Vhen a hydrous liquid is used evaporation of the liquid may obviously be further reduced by applying a film of oil thereto.
  • An electric switch of the fluid break type comprising a pressure chamber, a fixed contact therein, a vessel adapted to contain a supply of insulating liquid, said chamber having a small passage through which the insulating liquid may enter the chamber from the vessel, a discharge tube connected with the top of the pressure chamber and extending upwardly therefrom and a movable contact cooperating with said fixed contact and arranged to be initially separated therefrom in the pressure chamber and to be withdrawn from the discharge tube.
  • An electric switch of the fluid break type comprising a pressure chamber, a fixed contact therein, a vessel adapted to contain a sup ply of insulating liquid for the chamber, said chamber having a small passage through which the insulating liquid may enter from the vessel, an insulating discharge tube connected with the pressure chamber and extending therefrom up through the vessel, a contact rod extending through the discharge tube and spaced from the walls thereof and means for withdrawing the rod from the fixed contact and from the tube.
  • An electric switch of the fluid break type comprising a pressure chamber closed at its lower end and containing a fixed contact, a discharge tube extending up from the cham her, a movable contact arranged to be with drawn from the'fixed contact through the discharge tube and a reservoir for insulating liquid surrounding the' tube and in communication with pressure chamber, said tube passing out through the top of the vessel.
  • An electric switch of the fluid break type comprising a pressure chamber closed at its lower end and containing a fixed con tact, a vessel surrounding and communicating with said chamber and adapted to contain a supply of insulating liquid, a discharge tube extending up from the chamber and through the top of the vessel, and a contact rod arranged to extend through the tube to en "age the fixed contact.
  • a fluid break switch comprising coopcrating rod and socket contact members, an explosion chamber enclosing the socket contact member, a discharge tube extending upwardiy from said explosion chamber, an insulating fluid in said tube and chamber, and a cap adapted to cover the topof said tube when the switch is closed, said cap having a liquid seal with the tube to prevent evaporation of the insulating fluid therein.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
US684004A 1924-01-02 1924-01-02 Electric switch Expired - Lifetime US1733017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US684004A US1733017A (en) 1924-01-02 1924-01-02 Electric switch

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US684004A US1733017A (en) 1924-01-02 1924-01-02 Electric switch
GB11305/24A GB224167A (en) 1924-05-07 1924-05-07 Electric switches

Publications (1)

Publication Number Publication Date
US1733017A true US1733017A (en) 1929-10-22

Family

ID=9983792

Family Applications (1)

Application Number Title Priority Date Filing Date
US684004A Expired - Lifetime US1733017A (en) 1924-01-02 1924-01-02 Electric switch

Country Status (3)

Country Link
US (1) US1733017A (fr)
FR (1) FR592685A (fr)
GB (1) GB224167A (fr)

Also Published As

Publication number Publication date
GB224167A (en) 1924-11-06
FR592685A (fr) 1925-08-06

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