US2786117A - Air blast circuit breaker with parallel resistances - Google Patents

Air blast circuit breaker with parallel resistances Download PDF

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Publication number
US2786117A
US2786117A US488212A US48821255A US2786117A US 2786117 A US2786117 A US 2786117A US 488212 A US488212 A US 488212A US 48821255 A US48821255 A US 48821255A US 2786117 A US2786117 A US 2786117A
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US
United States
Prior art keywords
container
air
circuit breaker
gap
air blast
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
US488212A
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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 US2786117A publication Critical patent/US2786117A/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
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts

Definitions

  • the present invention relates to electric air blast circuit breakers, in which the main breaking contacts are arranged in a compressed air container, always filled with air under pressure, in which container a resistance is coupled in parallel with the main breaking gap over a certain auxiliary breaking gap, also arranged in the container.
  • the invention has for its purpose to produce, in a simple way, a flow of compressed air against the auxiliary breaking gap and thus facilitating the extinction of the are appearing there.
  • the invention is chiefly characterized thereby that the auxiliary breaking gap is arranged immediately before the outlet of a separate compartment in the container, so that, when at the opening of the circuit breaker air escapes from the container across the main breaking gap, the lowering of the pressure in the container also causes a flow of air from the separate compartment across the contacts of the auxiliary breaking gap.
  • the arrangement may either be such that the escape of air from said separate compartment commences immediately after the said lowering of the pressure in the container, but it can also be such that the escape of air from the separate compartment commences first when the auxiliary breaking contacts are separated, e. g. by so designing the movable contact in the auxiliary breaking gap that, when this is closed, the movable contact closes the outlet opening from said separate compartment, which opening is then opened, when the movable contact moves to its open position.
  • FIG. 1 A form of the invention is schematically shown on the accompanying drawing, Fig. 1, which schematically shows a circuit breaker with a main breaking gap and an auxiliary breaking gap, Whereas Fig. 2 shows a modified form.
  • 1 designates a base, on which two pillar insulators 2 and 3, carrying a compressed air container 4, are fastened.
  • a mechanism housing 5 In the wall of the container a mechanism housing 5 is inserted, which contains an operating member for the movable contact 6 of the main breaking gap and an outlet valve 7 from the air container.
  • the stationary contact 8 of the main breaking gap is attached to a leading-through insulator, which consists of an insulating cylinder 9 closed at the top by a cover 10 of metal.
  • 11 designates also a mechanism housing inserted in the wall of the compressed air container, which housing contains the operating menr her for the movable contact 12 of the auxiliary breaking gap, the stationary contact of said gap being designated by 13.
  • This contact is arranged at the lower end of a metal cylinder 14, which, at the lower end, is acc0mmodated to the stationary contact 13 in such a way that a slot 15 is formed between the stationary contact and the cylinder.
  • the cylinder 14 is attached to the cover 16, which, at the top, closes the cylinder 17 serving as nited States Patent O 'ice a leading-through insulator.
  • 18 designates a resistance, which is connected to the two covers 10 and 16.
  • the mechanism housings 5 and 11 are over a pipe line 19 in communication with a container for compressed air for the operation of the operating devices in said mechanism housings. Compressed air is delivered to the container 4 through a delivery line not shown on the drawing, which is suitably arranged inside one of the insulators 2 or 3.
  • This device acts in the following way.
  • compressed air is delivered to the mechanism housing 5 through the pipe line 19, which air, on one hand, acts on the movable contact 6, so that it is separated from the contact 8, and, on the other hand, opens the escape valve 7.
  • the pressure in the container 4 falls, and consequently the air in the cylinder 14 will escape from the cylinder 14 through the slot 15 and is brought in contact with the are formed between the contacts 12 and 13, so that this are is extinguished.
  • the escape of air from the cylinder 14 commences immediately after that the pressure in the container 4 is lowered.
  • the cylinder 14 is replaced by a container 20 arranged inside the container 4, the former container being provided with an outlet opening 21, in which the movable contact 12 of the auxiliary breaking gap fits.
  • the movable contact 12 is moved downwards and leaves the contact 13 simultaneously as the opening 21 is liberated, so that the air in the container 2% can escape through said opening and come in contact with the are between the contacts 12 and 13.
  • a valve 22 is arranged, through which the space inside the container 20 is again filled with compressed air, when the pressure in the container 4 is subsequently increased.
  • An air blast circuit breaker having a compressed air container and comprising main fixed and movable breaking contacts and auxiliary fixed and movable breaking contacts arranged in said container, means forming a separate compressed air compartment, an opening arranged in close proximity to the auxiliary breaker gap and providing communication between the said container and the said separate compartment, and air control means whereby the lowering of the air pressure in the container due to the opening of the circuit breaker and the consequent escape of air from the container permits air to escape from the said separate compartment through said Opening and into contact with the arc gap formed between the contacts of the said auxiliary breaking gap.
  • An air blast circuit breaker having a compressed air container and comprising main breaking contacts located in the container, means for permitting the escape of air from the container to extinguish the are at the main gap, means forming a separate compressed air compartment, an opening providing communication between the interior of said compartment and the interior of said container, a fixed and a movable contact forming auxiliary breaking contacts within said container, the said opening being arranged to divert the air from said compartment to said auxiliary gap when the air pressure in the container is reduced by the escape of air there- References Cited in the file of this patent UNITED STATES PATENTS 2,153,400 Trencham Apr. 4, 1939 2,453,555 T Subscriben Nov. 9, 1948 2,665,351 Forwald Jan. 5, 1954 FOREIGN PATENTS 469,892 Great Britain Aug. 3, 1937

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  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US488212A 1954-02-17 1955-02-15 Air blast circuit breaker with parallel resistances Expired - Lifetime US2786117A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE330287X 1954-02-17

Publications (1)

Publication Number Publication Date
US2786117A true US2786117A (en) 1957-03-19

Family

ID=20308067

Family Applications (1)

Application Number Title Priority Date Filing Date
US488212A Expired - Lifetime US2786117A (en) 1954-02-17 1955-02-15 Air blast circuit breaker with parallel resistances

Country Status (4)

Country Link
US (1) US2786117A (de)
CH (1) CH330287A (de)
DE (1) DE949498C (de)
GB (1) GB764646A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3018352A (en) * 1958-10-10 1962-01-23 Asea Ab High tension air blast circuit breakers with a plurality of series connected breaking gaps per pole
US3114816A (en) * 1960-09-22 1963-12-17 Gen Electric Circuit breaker of gas blast type having insulator bushing means for externally locating an impedance means
US3214546A (en) * 1961-10-12 1965-10-26 Westinghouse Electric Corp Compressed-gas circuit interrupters having improved arc-extinguishing means
US3270173A (en) * 1963-11-21 1966-08-30 Gen Electric Gas blast circuit breaker of the axial blast type with means for injecting a high velocity gas jet

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH361319A (de) * 1958-02-04 1962-04-15 Moser Glaser & Co Ag Druckgasschalter
DE1131772B (de) * 1960-02-08 1962-06-20 Licentia Gmbh Hochspannungsschalter
DE1163940B (de) * 1960-02-25 1964-02-27 Asea Ab Druckluftschalter mit reihengeschalteter Trennstelle in einer Durchfuehrung
CH386530A (de) * 1960-09-07 1965-01-15 Asea Ab Druckluftschalter mit einem auf Hochspannungspotential angeordneten, ständig mit Druckluft gefüllten Behälter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB469892A (en) * 1936-02-03 1937-08-03 British Thomson Houston Co Ltd Improvements in gas blast electric circuit-breakers
US2153400A (en) * 1936-12-14 1939-04-04 Gen Electric Electrical switch gear
US2453555A (en) * 1943-09-11 1948-11-09 Bbc Brown Boveri & Cie Gas blast circuit breaker
US2665351A (en) * 1951-02-09 1954-01-05 Asea Ab Arrangement in air blast circuit breaker provided with damping resistance

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB469892A (en) * 1936-02-03 1937-08-03 British Thomson Houston Co Ltd Improvements in gas blast electric circuit-breakers
US2153400A (en) * 1936-12-14 1939-04-04 Gen Electric Electrical switch gear
US2453555A (en) * 1943-09-11 1948-11-09 Bbc Brown Boveri & Cie Gas blast circuit breaker
US2665351A (en) * 1951-02-09 1954-01-05 Asea Ab Arrangement in air blast circuit breaker provided with damping resistance

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3018352A (en) * 1958-10-10 1962-01-23 Asea Ab High tension air blast circuit breakers with a plurality of series connected breaking gaps per pole
US3114816A (en) * 1960-09-22 1963-12-17 Gen Electric Circuit breaker of gas blast type having insulator bushing means for externally locating an impedance means
US3214546A (en) * 1961-10-12 1965-10-26 Westinghouse Electric Corp Compressed-gas circuit interrupters having improved arc-extinguishing means
US3270173A (en) * 1963-11-21 1966-08-30 Gen Electric Gas blast circuit breaker of the axial blast type with means for injecting a high velocity gas jet

Also Published As

Publication number Publication date
CH330287A (de) 1958-05-31
DE949498C (de) 1956-09-20
GB764646A (en) 1956-12-28

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