US3143623A - Operating means for a movable contact in the main breaking gap of an air blast circuit breaker - Google Patents

Operating means for a movable contact in the main breaking gap of an air blast circuit breaker Download PDF

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Publication number
US3143623A
US3143623A US148611A US14861161A US3143623A US 3143623 A US3143623 A US 3143623A US 148611 A US148611 A US 148611A US 14861161 A US14861161 A US 14861161A US 3143623 A US3143623 A US 3143623A
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US
United States
Prior art keywords
air
movable contact
container
blast valve
circuit breaker
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
US148611A
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English (en)
Inventor
Holm Tage
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 US3143623A publication Critical patent/US3143623A/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
    • H01H33/83—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 wherein the contacts are opened by the flow of air or gas

Definitions

  • a blast valve By means of a blast valve this can be put in communication with the open air, so that the air pressure in the compressed air container is able to move the movable contact into open position.
  • the movable contact which is connected with a plate, meets the valve head of the blast valve and is pneumatically connected to this, after which the movable contact is finally moved to open position and held there at the same time as the blast valve is closed.
  • the plate of the movable contact meets the valve head a space is formed between them which, via special channels and a two-way valve in the valve head, may be put in communication either with the open air or the compressed air container.
  • the two-way valve is operated by compressed air and is influenced by the same compressed air which controls the blast valve.
  • the two-way valve is influenced in such a direction that the said space between plate and valve head is connected to open air so that these parts are pneumatically connected together.
  • the present invention relates to a simplification of the above described breaking mechanism and enables the two-way valve in the valve head to be dispensed with. This is brought about, according to the invention, by the space between the plate of the movable contact and the blast valve being put in communication with the open air or compressed air via a separate control air pipe.
  • the blast valve may be joined to a piston operated by compressed air. Through this piston a channel may be arranged to said space and the separate control air pipe may be inserted in this channel.
  • the channel is provided with sealing rings which seal against the control air pipe. The piston can thus be displaced along the control air plpe.
  • FIGURE 1 shows the circuit breaker in closed position
  • FIGURE 2 shows the circuit breaker at that moment when the plate of the movable contacts meets the valve head
  • FIGURE 3 shows the circuit breaker in open position.
  • FIGURE 1 designates a container filled with compressed air and 2 a mechanism housing arranged in the container for the movable nozzle-shaped contact 3.
  • 4 is a stationary contact which is supported by an inlet arranged in the wall of the container 1.
  • the blast valve has a valve head 5 which is joined to a piston 6 on one side 3,143,623 Patented Aug. 4, 1964 ice of which a space 7 may be put in communication with compressed air or open air via a control air pipe 8.
  • the space 9 at the back of the piston is in permanent communication with the open air by means of channels 10.
  • FIGURE 2 shows how the space 12 which is formed between the plate 13 of the movable contact and the valve head 5 is in communication with a separate control air pipe 15 by means of a channel 14.
  • This control air pipe 15 is inserted in an extension in the lower part of the channel 14. Sealing rings 16, which close against the control air pipe, are arranged in the extension and the piston 5 can thus be displaced along the control air pipe 15.
  • the operating means functions in the following Way:
  • the control air pipe 8 is put under pressure at the same time as the control air pipe 15 is emptied.
  • the blast valve is thus opened and the compressed air in the container flows out through the movable contact 3 and the channels 11. Because of the pressure decrease which thus arises under the movable contact 3, this is carried downwards by the pressure in the container 1 and thus meets the valve head 5 of the blast valve, as shown in FIGURE 2.
  • the control air pipe 8 receives an emptying impulse which means that the contact 3 continues its movement to completely open position at the same time as the blast valve is closed.
  • the valve head 5 and the plate 13 remain pressed together since the space 12 is in communication with the open air.
  • both the control air pipes 8 and 15 are empty, which must be regarded as an advantage and give complete security against unintentional closing of the main breaking gap as a consequence of a break in a control air pipe.
  • the movable contact 3 is held in open position until the space 12 is again put in commuication with compressed air via the pipe 15, after which the closing of the contact takes place by means of a spring 17.
  • the control air pipe 15 must be under pressure as long as the circuit breaker is kept closed.
  • Air blast circuit breaker including a compressed air container, an operating housing secured to the container, a fixed contact within the container, a movable contact supported by said operating housing in the container, a blast valve for putting the compressed air container in communication with the open air, means to move the blast valve to open position, said movable contact being in the path of air escaping through said blast valve so that the pressure of such air moves the movable contact towards open position, said movable contact being provided with a plate engageable with the blast valve, said plate and blast valve when in contact forming a space between them, and a separate control pipe extending outside the container connected to said space and connectable to open air or compressed air, said blast valve opening means comprising a piston operated by compressed air, the connection from said control pipe to said space including a channel extending through said piston.

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  • Circuit Breakers (AREA)
  • Gas-Insulated Switchgears (AREA)
US148611A 1960-11-02 1961-10-30 Operating means for a movable contact in the main breaking gap of an air blast circuit breaker Expired - Lifetime US3143623A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1050560 1960-11-02

Publications (1)

Publication Number Publication Date
US3143623A true US3143623A (en) 1964-08-04

Family

ID=20292426

Family Applications (1)

Application Number Title Priority Date Filing Date
US148611A Expired - Lifetime US3143623A (en) 1960-11-02 1961-10-30 Operating means for a movable contact in the main breaking gap of an air blast circuit breaker

Country Status (3)

Country Link
US (1) US3143623A (de)
CH (1) CH402110A (de)
GB (1) GB924975A (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2803724A (en) * 1954-06-04 1957-08-20 Asea Ab Operating device for air blast circuit breakers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2803724A (en) * 1954-06-04 1957-08-20 Asea Ab Operating device for air blast circuit breakers

Also Published As

Publication number Publication date
CH402110A (de) 1965-11-15
GB924975A (en) 1963-05-01

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