US2575949A - Compressed air circuit breaker - Google Patents

Compressed air circuit breaker Download PDF

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Publication number
US2575949A
US2575949A US8894A US889448A US2575949A US 2575949 A US2575949 A US 2575949A US 8894 A US8894 A US 8894A US 889448 A US889448 A US 889448A US 2575949 A US2575949 A US 2575949A
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US
United States
Prior art keywords
circuit breaker
compressed air
valve
extinction
air
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
US8894A
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English (en)
Inventor
Forwald Haakon
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US2575949A publication Critical patent/US2575949A/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
    • H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
    • H01H33/82—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas

Definitions

  • the present invention has for its object an arrangement, by which a considerable saving of compressed air is reached by very simple and reliable means.
  • the invention is based upon the observation that for a given distance between the contacts a substantially lower pressure is necessary for the insulation after extinction than the pressure necessary for the extinction.
  • the circuit breaker is provided with arrangements, which immediately after the extinction of the arc reduce the pressure in the circuit breaker to a value considerably lower than the pressure prevailing at the extinction, said arrangements maintaining this value either until a disconnecting switch connected in series with the circuit breaker has been opened or until the contacts have been separated so far that no arc can be ignited again at atmospheric pressure.
  • Such an arrangement can for instance consist of a valve in the delivery line for the compressed air, which valve immediately after the extinction of the arc restricts the delivery of the air, so that the pressure is reduced in the above said manner.
  • FIG. 1 One form of the invention is illustrated on the accompanying drawing, on which 6' and l designate contacts forming an arcing gap, and on which and 1 designate an arcing chamber connected with an insulating cylinder 4 by means of a connecting-piece 5, such cylinder 4 being carried by a compressed air container I resting upon a stand 2.
  • An air blast valve I4 is provided with an operating piston 15, movable in a cylinder l2, compressed air being delivered to said cylinder I 2, from the container l, by the opening of an electrically actuated pilot valve [6.
  • a throttle valve I! In series with the air blast valve i4 is a throttle valve I! which is shown on the drawing in its partly closed or throttling position.
  • This valve I1 is normally held open by a helical spring l8 acting on a piston l9, movable in a cylinder l 3, and the valve I1 is moved to throttling position by compressed air passing from the valve [4 by way of a pipe line 29 and a needle valve 2
  • the needle valve 2! By adjustment of the needle valve 2!, the downward motion of the piston l9 can be regulated to delay the closing motion of the throttle valve I! to the desired value.
  • the downward motion of the piston l9 and Valve I! is limited by a collar 22 surrounding the rod 23 connecting the valve I!
  • the switch arm 8 of the disconnectin switch is, by means of an operating rod H, raised out of contact with the contact 9, which is carried by the insulator I0.
  • an air blast circuit breaker having an arcing gap, a disconnecting switch in series with the arcing gap, a compressed air container, a main valve controlling the supply of extinguishing air from the container to the arcing gap, and a throttle valve interposed between said main valve and the arcing gap, said throttle valve being normally open and commencing to close when exposed to the pressure from said container, and said closing being so delayed that extinction of the arc takes place before the throttle valve reaches its final throttling position with an opening suflicient to maintain an air pressure that prevents re-ignition of the arc.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Organic Insulating Materials (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Circuit Breakers (AREA)
US8894A 1943-07-17 1948-02-17 Compressed air circuit breaker Expired - Lifetime US2575949A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE583200X 1943-07-17

Publications (1)

Publication Number Publication Date
US2575949A true US2575949A (en) 1951-11-20

Family

ID=20312458

Family Applications (1)

Application Number Title Priority Date Filing Date
US8894A Expired - Lifetime US2575949A (en) 1943-07-17 1948-02-17 Compressed air circuit breaker

Country Status (5)

Country Link
US (1) US2575949A (xx)
BE (1) BE477586A (xx)
DE (1) DE894583C (xx)
FR (1) FR908065A (xx)
GB (1) GB583200A (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2786119A (en) * 1954-02-17 1957-03-19 Asea Ab Valve arrangement for air blast circuit breakers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1937482A (en) * 1928-09-18 1933-11-28 Ruppel Sigwart Compressed gas switch
US2125525A (en) * 1935-07-13 1938-08-02 Bbc Brown Boveri & Cie Electric circuit breaker
US2306186A (en) * 1941-01-27 1942-12-22 Gen Electric High voltage electric circuit breaker
US2331441A (en) * 1938-05-27 1943-10-12 Bbc Brown Boveri & Cie Electric switching arrangement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1937482A (en) * 1928-09-18 1933-11-28 Ruppel Sigwart Compressed gas switch
US2125525A (en) * 1935-07-13 1938-08-02 Bbc Brown Boveri & Cie Electric circuit breaker
US2331441A (en) * 1938-05-27 1943-10-12 Bbc Brown Boveri & Cie Electric switching arrangement
US2306186A (en) * 1941-01-27 1942-12-22 Gen Electric High voltage electric circuit breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2786119A (en) * 1954-02-17 1957-03-19 Asea Ab Valve arrangement for air blast circuit breakers

Also Published As

Publication number Publication date
FR908065A (fr) 1946-03-29
BE477586A (xx)
GB583200A (en) 1946-12-11
DE894583C (de) 1953-10-26

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