US2653204A - Equalizing device for air current in air blast circuit breakers - Google Patents

Equalizing device for air current in air blast circuit breakers Download PDF

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Publication number
US2653204A
US2653204A US139062A US13906250A US2653204A US 2653204 A US2653204 A US 2653204A US 139062 A US139062 A US 139062A US 13906250 A US13906250 A US 13906250A US 2653204 A US2653204 A US 2653204A
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United States
Prior art keywords
air
blast circuit
circuit breakers
equalizing device
air current
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Expired - Lifetime
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US139062A
Inventor
Forwald Haakon
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ABB Norden Holding AB
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ASEA AB
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Publication of US2653204A publication Critical patent/US2653204A/en
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    • 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
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7023—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle
    • H01H33/703—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle having special gas flow directing elements, e.g. grooves, extensions
    • 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
    • H01H33/24—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring

Definitions

  • the present invention has for its object an arrangement in air blast circuit breakers by which an improved extinguishing action is attained.
  • air blast circuit breakers the compressed an is delivered to the arc, occurring when the c1rcuit breaker is opened, by pipe lines or channels, and in the air currents there are formed whirls which, when they come into the space between the opened contacts of the circuit breaker, decrease the dielectric strength of the air.
  • this disadvantageous action of the whirl formation is avoided thereby that the extinguishing air current immediately before it comes into contact with the arc is brought to pass a plurality of guide vanes or other members which divide the air current into a plurality of parallel currents, by which step the whirl formation in the air current is suppressed or entirely avoided.
  • These guide vanes may either be of insulating material or of metal, and in the latter case they may be conductively interconnected and connected with one of the contacts. Instead of delivering the air across the said guide vanes, a plurality of narrow channels may be arranged, through which the air is delivered to the are.
  • i designates the stationary contact of the circuit breaker and 2 its movable contact, which latter, when moving downwards, is intended to be drawn into a space limited by a cylinder 3.
  • the space below the stationary contact is surrounded by a cylinder 4, and the compressed air for the extinction is delivered to the arc in the space between the two contacts I and 2.
  • a number of bafiies are arranged, which are provided with openings for the passage of the movable contact.
  • baflles are in a suitable manner arranged at a small distance from each other, and carried by an insulating cylinder 6 attached to the cylinder 3.
  • bafiles 5 may either be made of metal as shown or of some insulating material. In the case that they are made of metal, they may either be insulated from each other or be conductively interconnected, and in the latter case they may also be connected with one of the contacts as by the connections I. histead of making the baflies entirely flat, as shown on the drawing, they may also be cupformed. Their chief feature is that they are able to perform a division of the air current into a plurality of currents and do not form any obstacle to it. Instead of dividing the compressed air current by means of baflies, the division can also be performed by means of a number of short pipes or channels directed against the arc.
  • An air blast circuit breaker comprising fixed and movable contacts, a casing surrounding one of said contacts and enclosing an annular passage for the supply of extinguishing air to the arc gap between the contacts, and a plurality of air separating members arranged in the form of an annulus and in closely spaced relation to each other to counteract whirling motions in the extinguishing air before such air passes from said annular passage to the arc gap.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Massaging Devices (AREA)
  • Circuit Breakers (AREA)

Description

Sept. 22, 1953 FORWALD 2,653,204
H. EQUALIZING DEVICE FOR AIR CURRENT IN AIR BLAST CIRCUIT BREAKERS Filed Jan. 17, 1950 //7 yen for fleeKo/v TORWAAD Patented Sept. 22, 1953 EQUALIZIN G DEVICE FOR AIR CURRENT 1N AIR BLAST CIRCUIT BREAKERS Haakon Forwald, Valhalla, Sweden, assignor to Allmanna Svenska Elektriska Aktiebolaget, Vasteras, Sweden, a Swedish corporation Application January 17, 1950, Serial N 0. 139,062 In Sweden January 27, 1949 3 Claims. (Cl. 200-148) The present invention has for its object an arrangement in air blast circuit breakers by which an improved extinguishing action is attained. In air blast circuit breakers the compressed an is delivered to the arc, occurring when the c1rcuit breaker is opened, by pipe lines or channels, and in the air currents there are formed whirls which, when they come into the space between the opened contacts of the circuit breaker, decrease the dielectric strength of the air. According to the present invention, this disadvantageous action of the whirl formation is avoided thereby that the extinguishing air current immediately before it comes into contact with the arc is brought to pass a plurality of guide vanes or other members which divide the air current into a plurality of parallel currents, by which step the whirl formation in the air current is suppressed or entirely avoided. These guide vanes may either be of insulating material or of metal, and in the latter case they may be conductively interconnected and connected with one of the contacts. Instead of delivering the air across the said guide vanes, a plurality of narrow channels may be arranged, through which the air is delivered to the are. On the accompanying drawing, one form of the invention is shown, where i designates the stationary contact of the circuit breaker and 2 its movable contact, which latter, when moving downwards, is intended to be drawn into a space limited by a cylinder 3. The space below the stationary contact is surrounded by a cylinder 4, and the compressed air for the extinction is delivered to the arc in the space between the two contacts I and 2. Around the arc gap and in the immediate neighbourhood of it, a number of bafiies are arranged, which are provided with openings for the passage of the movable contact. These baflles are in a suitable manner arranged at a small distance from each other, and carried by an insulating cylinder 6 attached to the cylinder 3. The air streaming upwards between the cylinders 3 and 4 is by these bafiles 5 divided into a plurality of parallel currents directed against the arc. The bafiles 5may either be made of metal as shown or of some insulating material. In the case that they are made of metal, they may either be insulated from each other or be conductively interconnected, and in the latter case they may also be connected with one of the contacts as by the connections I. histead of making the baflies entirely flat, as shown on the drawing, they may also be cupformed. Their chief feature is that they are able to perform a division of the air current into a plurality of currents and do not form any obstacle to it. Instead of dividing the compressed air current by means of baflies, the division can also be performed by means of a number of short pipes or channels directed against the arc.
I claim as my invention:
1. An air blast circuit breaker comprising fixed and movable contacts, a casing surrounding one of said contacts and enclosing an annular passage for the supply of extinguishing air to the arc gap between the contacts, and a plurality of air separating members arranged in the form of an annulus and in closely spaced relation to each other to counteract whirling motions in the extinguishing air before such air passes from said annular passage to the arc gap.
2. An air blast circuit breaker according to claim 1, in which said members consist of a series of closely spaced annular baffles.
3. An air blast circuit breaker according to claim 1, in which said members consist of a series of closely spaced annular baffles of metal electrically connected with each other and with one of said contacts.
HAAKON FORWALD.
References Cited in the file of this patent UNITED STATES PATENTS Name Date Trencharn Mar. 10, 1942 Bennett Aug. 14, 1945 FOREIGN PATENTS Number Number
US139062A 1949-01-27 1950-01-17 Equalizing device for air current in air blast circuit breakers Expired - Lifetime US2653204A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE279750X 1949-01-27

Publications (1)

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US2653204A true US2653204A (en) 1953-09-22

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ID=20306978

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Application Number Title Priority Date Filing Date
US139062A Expired - Lifetime US2653204A (en) 1949-01-27 1950-01-17 Equalizing device for air current in air blast circuit breakers

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US (1) US2653204A (en)
CH (1) CH279750A (en)
DE (2) DE908878C (en)
FR (1) FR1009463A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813177A (en) * 1954-03-29 1957-11-12 Kelman Electric And Mfg Compan Circuit breaker

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1069738B (en) * 1956-01-17 1959-11-26
FR2623657A1 (en) * 1987-11-19 1989-05-26 Merlin Gerin Circuit-breaker with self-blasting by expansion of insulating gas, equipped with an electric field distribution screen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB369189A (en) * 1929-09-11 1932-03-17 British Thomson Houston Co Ltd Improvements in and relating to circuit breakers
GB478122A (en) * 1935-06-14 1938-01-10 Siemens Ag Improvements in and relating to arc quenching devices
GB516529A (en) * 1938-06-22 1940-01-04 Reyrolle A & Co Ltd Improvements in or relating to electric circuit-breaking devices of the gas-blast type
US2275872A (en) * 1939-06-27 1942-03-10 Gen Electric Gas blast electric circuit breaker
US2382850A (en) * 1942-06-16 1945-08-14 Gen Electric Gas blast electric circuit breaker

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602039C (en) * 1927-10-30 1934-09-04 Siemens Schuckertwerke Akt Ges counter
DE600406C (en) * 1932-10-13 1934-07-21 Bbc Brown Boveri & Cie High voltage alternating current switch
DE603883C (en) * 1933-03-23 1934-10-10 Bbc Brown Boveri & Cie Switching arrangement
DE687900C (en) * 1934-07-18 1940-02-08 Frida Strauss Geb Ruppel Switch with arc extinguishing by compressed gas
BE412834A (en) * 1934-12-18

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB369189A (en) * 1929-09-11 1932-03-17 British Thomson Houston Co Ltd Improvements in and relating to circuit breakers
GB478122A (en) * 1935-06-14 1938-01-10 Siemens Ag Improvements in and relating to arc quenching devices
GB516529A (en) * 1938-06-22 1940-01-04 Reyrolle A & Co Ltd Improvements in or relating to electric circuit-breaking devices of the gas-blast type
US2275872A (en) * 1939-06-27 1942-03-10 Gen Electric Gas blast electric circuit breaker
US2382850A (en) * 1942-06-16 1945-08-14 Gen Electric Gas blast electric circuit breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813177A (en) * 1954-03-29 1957-11-12 Kelman Electric And Mfg Compan Circuit breaker

Also Published As

Publication number Publication date
FR1009463A (en) 1952-05-29
DE908878C (en) 1954-04-12
DE865758C (en) 1953-02-05
CH279750A (en) 1951-12-15

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