US3143612A - Electric circuit breakers of the type which are temporarily pneumatically opened - Google Patents

Electric circuit breakers of the type which are temporarily pneumatically opened Download PDF

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Publication number
US3143612A
US3143612A US167034A US16703462A US3143612A US 3143612 A US3143612 A US 3143612A US 167034 A US167034 A US 167034A US 16703462 A US16703462 A US 16703462A US 3143612 A US3143612 A US 3143612A
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US
United States
Prior art keywords
piston
cylinder
active
chamber
rest
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
US167034A
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English (en)
Inventor
Nijland Elizabeth Hidde
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Co2 Nv
N V "co2"
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Co2 Nv
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Filing date
Publication date
Application filed by Co2 Nv filed Critical Co2 Nv
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Publication of US3143612A publication Critical patent/US3143612A/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
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/32—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator pneumatic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7738—Pop valves
    • Y10T137/7743—Lost motion between pop pressure reactor and valve

Definitions

  • the invention relates to an electro-circuit breaker of the type, which is temporarily pneumatically opened and comprises a fixed contact and a movable contact forced against said first contact by a spring, said movable contact being mounted to be separated from said fixed contact by a piston which is mounted for reciprocation in a cylinder and is moved when one side of the piston is exposed to gas, of which the pressure has reached a predetermined value, said piston being adapted to move with respect to the movable contact freely along a predetermined distance and being forced by a spring into a position ofrest, in which position said piston is exposed to the gas pressure with a portion of its active area only, the arrangement being such as to permit the entire active area of the piston of being exposed to the gas pressure after the piston has been moved by the gas out of its position of rest againstsaid spring and before it is coupled with the movable contact.
  • the invention has for its object to provide an electric circuit breaker of the type referred to, in which both the cylinder and the piston consist of one active cylindric part only, so that the manufacture is considerably simplified and further advantages to be described hereinafter are obtained. It consists in that the active area of the piston or the cylinder end wall facing said piston area is provided with an annular rib having a diameter which is smaller than that of the piston and a ring of elastic material is provided on said cylinder end wall or said piston area, respectively, said cylinder end wall and the elastic ring, if provided on said wall, having exclusively inside or outside the annular rib one or more passages for the supply of gas under pressure, said rib and said elastic ring being pressed against one another in a gas tight manner by the spring loading the piston, when the latter is in its position of rest.
  • the lost motion of the piston may be made smaller than those of the piston having a reduced portion, so that the cylinder may have a smaller axial dimension and the time passed between the point of time, at which the gas under pressure is supplied, and that, at which the switching-otf operation takes place, will be shorter.
  • annular rib such a cross-sectional 3,143,612 Patented Aug. 4, 1964 'ice profile as to have said rib pressed into the elastic ring with a sharp edge.
  • Said cross-sectional profile may have the shape of a triangle of which the base faces the piston.
  • the cylinder space in which the gas pressure becomes last active, may be connected with the atmosphere by a vent, when the piston is in its position of rest, said' vent being closed, as soon as the piston is exposed with its entire active area to the gas pressure.
  • This vent enables the pressure under the piston area to remain equal to that of the atmosphere as long as the two parts of the active cylinder chamber are separated from another by the annular rib.
  • This vent may open into the inactive cylinder chamber and 'may' be closed by the piston itself. In that case an additional valve for closing the vent is dispensed with.
  • a fixed contact provided with a terminal strip 2 for the connection to the outer circuit.
  • a movable contact 3 which in the present case closes an opening 4 for the discharge of extinguishing gas.
  • the movable contact 3 has astem 5, which is passed through the'bottom 6 of a cylinder 7 and through a fixed contact ring 8 also provided with a terminal strip 9.
  • a piston 10 is loosely mounted on the stem 5 in the cylinder 7..
  • Said piston is provided with an annular rib 11 having a triangular cross profile and in its position of rest said piston is pressed with its rib against a ring 13 of elastic material by a'spring 12.
  • the elastic ring 13 lies on the cylinder bottom 6.
  • the part 14 of said cylinder chamber communicates through passages 16 made in the cylinder bottom 6 with the switching chamber 17, to which gas under pressure can be supplied through an aperture 18 made in the wall of a tube 19 of insulating materi'al: 'This tube keeps the fixed contact 1 and the ring contact 8 spacedapart and surrounds the switching chamber 17.
  • the contact pressure between the contacts 1 and 3 is furnished by the spring 20.
  • the cylinder space In the position of rest of the piston the cylinder space is connected by a by-pass passage or vent 22 to the chamber 23 which communicates with the atmosphere. Said. vent makes that the pressure in the cylinder space 15 is not able to rise when gas is leaking from. the cylinder space 14 into the space 15 through the seal formed by. the rib 11 of the piston 10 and the elastic ring 13 in the position of rest of the piston.
  • the connection between the cylinder space 15 and the chamber 23 is interrupted by the piston 10, so that also in the cylinder space 15 the pressure of the gas is permitted to rise;
  • the pneumatic switching-off operation of the circuit breaker and the extinguishing of. the established arc may be effected independently from one another and by different fluids.
  • the rib 11 may be provided on the cylinder bottom 6 and the ring 13 may be attached to the piston 10.
  • a pneumatically openable electric circuit breaker comprising a fixed contact, a movable contact, a spring tending to force said movable contact against said fixed contact, a cylinder, a piston mounted for reciprocation in said cylinder and dividing said cylinder into an active" chamber and an inactive chamber, passages for leading and the area of the active face of the piston includes an annular rib formed on the active face of the piston and a seat of elastic material on the cylinder onto which the rib is pressed by said second spring in the position of rest of said piston.
  • annular rib has a cross sectional profile including a sharp edge which is pressed into said elastic seat gas under pressure into said active chamber and against an active face of said piston, a second spring tending to force said piston into a position of rest, means dividing the active cylinder chamber and the area of the active face of the piston each into two parts when the piston is in its position of rest and inoperative to so divide the piston and active chamber upon movement of the piston from itsposition of rest, the passages for supplying gas under pressure opening into one of said parts of the active cylinder chamber, and coupling means for connecting said piston with said movable contact to move the latter contact away from the fixed contact upon exposure.
  • said piston having a lost motion betweenits position of' rest and a coupling position in which it is connected to said movable contact by said coupling means, whereby the application of gas under pressure exceeding said predetermined value acts first on only part ofv the active face of the piston to slowly move the piston'from when the piston is in its position of rest.
  • An electric circuit breaker as claimed in claim 1 further comprising a vent passage connecting to atmosphere that part of the active cylinder chamber separated from the part into which the gas supply passages open,
  • vent passage being closed by the piston when the piston is moved from its rest position towards the position for coupling the piston with the movable contact.
  • a pneumatically openable electric circuit breaker comprising a fixed contact, a movable contact, a spring tending to force said movable contact against said fixed contact, a cylinder, a piston mounted for reciprocation in said cylinder, passages for leading gas under pressure into said chamber and against one face of said piston, a second spring tending to force said piston into a position of rest, means dividing said cylinder and the area of said one face of the piston into two active gas chambers when the piston is in its position of rest andinoperative to separate said active chamber upon movement of the piston from its position of rest, the passages for supplying gas under pressure opening intoone of said active chambers, and

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  • Circuit Breakers (AREA)
  • Actuator (AREA)
US167034A 1961-01-24 1962-01-18 Electric circuit breakers of the type which are temporarily pneumatically opened Expired - Lifetime US3143612A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL260393 1961-01-24

Publications (1)

Publication Number Publication Date
US3143612A true US3143612A (en) 1964-08-04

Family

ID=19752828

Family Applications (1)

Application Number Title Priority Date Filing Date
US167034A Expired - Lifetime US3143612A (en) 1961-01-24 1962-01-18 Electric circuit breakers of the type which are temporarily pneumatically opened

Country Status (6)

Country Link
US (1) US3143612A (fr)
BE (1) BE612865A (fr)
CH (1) CH406359A (fr)
DE (1) DE1182726B (fr)
GB (1) GB930987A (fr)
NL (2) NL120011C (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3496378A (en) * 1966-05-11 1970-02-17 Teiichi Sakamoto Selectively interconnected parallel charge,series discharge,capacitive impulse voltage generator
US4233554A (en) * 1979-04-05 1980-11-11 The United States Of America As Represented By The Secretary Of The Army Vent actuated shorting switch
US5099876A (en) * 1990-02-23 1992-03-31 Peretz Rosenberg Quick-action shut-off valve

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US693416A (en) * 1899-11-09 1902-02-18 Lorain Steel Co Circuit-breaker.
FR813229A (fr) * 1937-05-28
US2091904A (en) * 1935-05-13 1937-08-31 Baumann Charles Door closing and checking device
US2420370A (en) * 1944-01-26 1947-05-13 Air Reduction Pressure relief valve
US2556209A (en) * 1949-02-08 1951-06-12 Sydney R Kramer Pneumatic electric switch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR813229A (fr) * 1937-05-28
US693416A (en) * 1899-11-09 1902-02-18 Lorain Steel Co Circuit-breaker.
US2091904A (en) * 1935-05-13 1937-08-31 Baumann Charles Door closing and checking device
US2420370A (en) * 1944-01-26 1947-05-13 Air Reduction Pressure relief valve
US2556209A (en) * 1949-02-08 1951-06-12 Sydney R Kramer Pneumatic electric switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3496378A (en) * 1966-05-11 1970-02-17 Teiichi Sakamoto Selectively interconnected parallel charge,series discharge,capacitive impulse voltage generator
US4233554A (en) * 1979-04-05 1980-11-11 The United States Of America As Represented By The Secretary Of The Army Vent actuated shorting switch
US5099876A (en) * 1990-02-23 1992-03-31 Peretz Rosenberg Quick-action shut-off valve

Also Published As

Publication number Publication date
CH406359A (de) 1966-01-31
NL260393A (fr) 1900-01-01
GB930987A (en) 1963-07-10
BE612865A (fr) 1962-05-16
NL120011C (fr) 1900-01-01
DE1182726B (de) 1964-12-03

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