US2949521A - High tension air blast circuit breaker - Google Patents

High tension air blast circuit breaker Download PDF

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Publication number
US2949521A
US2949521A US760357A US76035758A US2949521A US 2949521 A US2949521 A US 2949521A US 760357 A US760357 A US 760357A US 76035758 A US76035758 A US 76035758A US 2949521 A US2949521 A US 2949521A
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US
United States
Prior art keywords
contact
air
container
piston
operating
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
US760357A
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English (en)
Inventor
Schulz Richard
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 US2949521A publication Critical patent/US2949521A/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
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56—Gas reservoirs

Definitions

  • the present invention relates to a high tension air blast circuit breaker having its breaking gap arranged inside a compressed air container, which is under operating pressure at least When the breaking gap is open. If the operating pressure falls due to damage to the compressed air container, an unintentional closing or opening of the breaking gap of this breaker can occur, if the movable contact is held in its position by the operating pressure. This has to be avoided in any case. If the breaker is provided with a lplurality of series ⁇ connected breaking gaps per pole, the other breaking gaps can still be operated by blocking the supply line for the compressed air to the damaged breaking gap. But if the breaker is only provided with one or two breaking gaps per pole, a special safety measure is necessary.
  • a decrease of the electric strength of the breaking distance may occur witha decrease in the operating pressure
  • the counter-contact belonging to the movable contact is not moved at normal operating of the breaker, but according to the invention automatically changes its position at a predetermined decrease of the operating pressure in the air container, so that the breaking distance is increased.
  • an open breaking gap .the movable contact of which is kept in its position by the operating pressure
  • the counter-contact can never be closed again at an unintentional decrease in the operating pressure, as the counter-contact then has moved away from the movable contact to such an extent that there is a sutlicient insulating distance between the contacts even with the absence of compressed air.
  • the counter-contact which is not moved at normal operating of the breaker, is kept in its position against the force of a spring by a piston influenced by the operating pressure. If the operating pressure vanishes, the countercontact is moved in the direction from the movable contact by the spring force and thus the breaking distance is increased.
  • the counter-contact which is not moved at normal operating of the breaker, may be latched in its normal position in order to get a certain safety when operating the breaker.
  • This latching is necessary in the closed position for avoiding that at decreasing air pressure an arc is drawn by the countercontact, which arc could not then be extinguished.
  • the block In the open position the block can for instance be removed by the operating or blast air or by the movable contact being in its open position.
  • the arrangement has to be such that at decreased operating pressure in the compressed air container the counter-contact starts its movement earlier than the movable contact being in its open position, in order to prevent that the movable contact on its movement to its closed position touches the counter-contact.
  • the counter-contact has .taken up a position increasing the breaking distance, itis advantageously latched, in order to avoid an undesired closing of the breaker at an unforeseen increase of the operating pressure.
  • the operating mechanism of the lcounter-contact can be mechanically or pneumatically connected to a fault indicator.
  • the iigures serve for explaining the invention and show schematically a possible design of the breaker in the closed, open and latched position.
  • Fig. l shows the breaking gap in the closed position.
  • the support 1 carries the compressed air container 2, in which there are arranged the movable contact 3 and ⁇ the countercontact 4.
  • the movable contact 3 is operated by a mechanism identical to that described in the patent to Forwald, No. 2,803,724.
  • the contact 3 is held in the closed position by the spring 5, as long as the space '6 is under pressure.
  • the breaker opens when the space 7 is supplied with operating air, and the piston 8 and the differential piston 9 ⁇ are moved downwards, the valve 10 is closed and the valve 11 is opened.
  • the contact 3 In the open position, Fig. 2, the contact 3 is held in its position against the force of the spring 5 by the compressed air in the space 2. If in the open position the operating air is removed from the space 7 for the purpose of closing the breaker, the piston 8 is moved upwards and opens the valve 10, so that the space 6 is connected with the space 2 through the channel 13. Thus the contact 3 is moved downwards into the closed position due to the force of the spring 5 (Fig. l).
  • the counter-contact 4 is displaceably arranged and attached to the pipe 17, which at one end is widened to form a piston. Thus the counter-contact 4 forms with the piston 18 a differential piston.
  • a space 25 on the upper side of the piston 18 is in communication with the open air through the opening 24 and the space 19 below the piston 18 communicates with the compressed air container 2, through the pipe 17 and the opening 23.
  • the piston 18 is biased upwards by the compressed air in the space 19 against the force of the spring 20 and held in its ⁇ normal operating position as long as the air pressure in the container 2 and space 19 is held above a predetermined value.
  • the piston 18 is latched by the hook pin 21.
  • the latter is lifted by the ⁇ operating air from the pipe 22, when on opening of the breaker the space 7 is supplied with operating air.
  • the position of the counter-contact 4 is unchanged, as the space 19 is connected with the air container 2 through the pipe 17 and consequently compressed air influences the piston 18.
  • the 'nook pin will fall down after that the pressure of the operating air also in the pipe 22 gradually has decreased, and the differential piston 18 is latched in this position.
  • the counter-contact 4 cannot move back if the air pressure in the container 2 increases again.
  • a fault signal or an indicating device can be actuated by the movement of the piston 18.
  • a pneumatically operated circuit breaker comprisV ing a first movable contact, a second movable Contact, a container enclosing said contacts, said first contact being movable between a first and a second position, said second Contact when said first contact is in its rst position being movable between a first engaged position and a second disengaged position with respect to said first contact, said first contact in its second position being at an insulating distance from said second contact even when said ⁇ second contact is in its first position, the said container being filled with compressed air at 4. least when said second contact is in its second position, pneumatic operating means responsive to a predetermined pressure condition in the container' for moving said first contact to its second position, and latch means arranged to latch said first contact in its first position when said second contact is in its first engaged position.
  • a pneumatically operated circuit breaker comprising a first movable contact, a second movable contact, a container enclosing said contacts, said rst contact being movable between a first and a second position, said second contact when said first contact is in its first position being movable between a first engaged position and a second disengaged position with respect to said first contact, said first contact in its second position being at an insulating distance from said second contact even when said second contact is in its first position, the said container being filled with compressed air at least when said second contact is in its second position, pneumatic operating means responsive to a predetermined pressure condition in the container -for moving said first contact to its second position, and a latch device arranged to latch the first contact in its second position.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Circuit Breakers (AREA)
US760357A 1957-09-12 1958-09-11 High tension air blast circuit breaker Expired - Lifetime US2949521A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE359763X 1957-09-12

Publications (1)

Publication Number Publication Date
US2949521A true US2949521A (en) 1960-08-16

Family

ID=6291265

Family Applications (1)

Application Number Title Priority Date Filing Date
US760357A Expired - Lifetime US2949521A (en) 1957-09-12 1958-09-11 High tension air blast circuit breaker

Country Status (5)

Country Link
US (1) US2949521A (US07122603-20061017-C00294.png)
CH (1) CH359763A (US07122603-20061017-C00294.png)
DE (1) DE1049954B (US07122603-20061017-C00294.png)
FR (1) FR1203280A (US07122603-20061017-C00294.png)
GB (1) GB841341A (US07122603-20061017-C00294.png)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3047697A (en) * 1958-06-04 1962-07-31 Allmanna Svenska Elek Sa Aktie Latch-open mechanism for air blast circuit breaker
US3093717A (en) * 1960-02-25 1963-06-11 Asea Ab Air blast circuit breaker having a series connected breaking gap in a bushing
US3649792A (en) * 1968-12-20 1972-03-14 Coq Nv Gas-blast circuit breakers
CN105810495A (zh) * 2016-04-27 2016-07-27 维龙（镇江）电工研究院有限公司 直动型三工位负荷开关

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1216408B (de) * 1962-02-27 1966-05-12 Continental Elektro Ind Ag Hochspannungsdruckgasschalter
DE1260589B (de) * 1962-03-09 1968-02-08 Ass Elect Ind Schaltventil fuer Druckgasschalter
DK153785A (da) * 1984-04-09 1985-10-10 Raychem Corp Sikkerhedsbelastningsafbryder

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB337508A (en) * 1929-08-22 1930-11-06 Sigwart Ruppel Improvements relating to actuating mechanism for electrical switches
GB394620A (en) * 1932-02-18 1933-06-29 Gen Electric Improvements in and relating to electric switches or circuit breakers
GB594386A (en) * 1944-07-17 1947-11-10 Oerlikon Maschf Improvements in or relating to high tension gas-blast circuit-breakers
US2803724A (en) * 1954-06-04 1957-08-20 Asea Ab Operating device for air blast circuit breakers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB337508A (en) * 1929-08-22 1930-11-06 Sigwart Ruppel Improvements relating to actuating mechanism for electrical switches
GB394620A (en) * 1932-02-18 1933-06-29 Gen Electric Improvements in and relating to electric switches or circuit breakers
GB594386A (en) * 1944-07-17 1947-11-10 Oerlikon Maschf Improvements in or relating to high tension gas-blast circuit-breakers
US2803724A (en) * 1954-06-04 1957-08-20 Asea Ab Operating device for air blast circuit breakers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3047697A (en) * 1958-06-04 1962-07-31 Allmanna Svenska Elek Sa Aktie Latch-open mechanism for air blast circuit breaker
US3093717A (en) * 1960-02-25 1963-06-11 Asea Ab Air blast circuit breaker having a series connected breaking gap in a bushing
US3649792A (en) * 1968-12-20 1972-03-14 Coq Nv Gas-blast circuit breakers
CN105810495A (zh) * 2016-04-27 2016-07-27 维龙（镇江）电工研究院有限公司 直动型三工位负荷开关

Also Published As

Publication number Publication date
GB841341A (en) 1960-07-13
DE1049954B (US07122603-20061017-C00294.png) 1959-02-05
FR1203280A (fr) 1960-01-18
CH359763A (de) 1962-01-31

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