US3206582A - Air-blast circuit breaker with double nozzle - Google Patents

Air-blast circuit breaker with double nozzle Download PDF

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Publication number
US3206582A
US3206582A US242481A US24248162A US3206582A US 3206582 A US3206582 A US 3206582A US 242481 A US242481 A US 242481A US 24248162 A US24248162 A US 24248162A US 3206582 A US3206582 A US 3206582A
Authority
US
United States
Prior art keywords
piston
chamber
air
housing
exhaust valve
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
US242481A
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English (en)
Inventor
Jukka A K Jussila
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.)
BBC Brown Boveri AG Germany
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
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 BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
Application granted granted Critical
Publication of US3206582A publication Critical patent/US3206582A/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
    • H01H33/86—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid under pressure from the contact space being controlled by a valve

Definitions

  • the invention concerns lan air-blast circuit breaker with a double nozzle, one of the nozzles acting as the fixed contact element and the other one as the movable contact element. When these circuit breakers are in the open position, the separated contacts are kept under air pressure.
  • a constructional example of a circuit breaker according to the invention is illustrated schematically in the accompanying drawing.
  • the circuit breaker is shown in the figure in the position required for the occurrence of the air blast.
  • valve 5 Located inside the switch chamber 1 are the two coaxial tubular contacts 2, 3.
  • contact 2 is stationary and contact 3 is movable.
  • the movable contact 3 is provided with a piston 4 against which a spring 18 exerts a pressure.
  • Piston 4 operates within a cylinder part 6a of a housing and the other part 6b of this housing serves to accommodate spring 18 and functions as a chamber for exhaust valve 6.
  • Reference number 5 indicates the exhaust valve easing of the fixed contact 2 and 6 is the exhaust valve for the movable contact 3.
  • Valve 5 comprises a valve disc 7 land a piston 8 which is joined to the valve disc by means of a spindle 9.
  • Piston 8 is provided with holes 11 which can be closed by a non-return plate 10.
  • the control system is indicated by the control element 19 which can be actuated lby way of the control pipe 20.
  • the line 23 indicates a connection to an interlocking ⁇ device 21.
  • the locking device 21 for piston 4 serves to maintain it and hence contact member 3 disengaged from contact member 2 for as long as it is desired to maintain the contacts in their disengaged position.
  • Contact member 3 can be released so as to shift to the left by the restoring force built up in compression spring 19 by releasing the locking device from piston 4 with a pressure pulse transmitted over line 23 from the control element 19.
  • This locking device per se is conventional and can be found more particularly described and illustrated in German Patent No.
  • valves 6 and 7 In the closed position of the hollow contact members 2, 3 as indicated by the broken line position of contact member 3, valves 6 and 7 will be in their closed positions as indicated by the broken lines. Moreover, the interior of these contact members as well as the housing for valve 6 and housing 5 of valve 7 and the interior of chamber 13 will have been re-iilled with pressure gas from switch chamber 1 flowing into the latter while contacts 2 and 3 were held in a separated condition by locking device 21.
  • Exhaus-t valve 6 is opened vby means of control element 19 due to compressed air from control pipe 20 acting yon the element, whereupon compressed air flows from the inside of tubular contacts 2 and 3 to the outside.
  • Piston 4 is, however, still subjected to the full pressure of the compressed air, so that tubular contact 3 is moved against the spring 18 and the contacts separate. Compressed air then flows from the extinguishing chamber into the tubular contacts 2, 3 as indicated by the arrows in the figure. As a result, the arc which has occurred is extinguished.
  • Piston 4 passes beyond the interlocking device 21 which holds the movable contact 3 in a fixed position.
  • Valve 7 is opened and compressed air can now flow through opening 16.
  • Nonreturn valve 10 closes the openings 11 in piston 8, so that the pressure is rst of all maintained in chamber 13. Air escapes slowly through the opening 12 so that the pressure in chamber 13 decreases somewhat after a certain time.
  • valve 6 closes again due to the blast pressure which acts on the valve.
  • valve disc 7 is moved towards the left against the somewhat reduced pressure in chamber 13 and closes the exhaust port 16 so that the extinguishing chamber 1 is closed again and can be refilled with compressed air supplied by way of compressed lair pipe 22. This compressed air ensures that the electric strength between contacts 2 and 3 is adequate.
  • Chamber 13 is refilled with air again which flows through the openings 11 which only open when the pressure in the extinguishing chamber is higher than that in chamber 13.
  • exhaust valve 7 is actuated by the compressed air which passes through the hollow con- -tacts 2 4and 3 when in the closed position.
  • a special air supply pipe for actuating the exhaust valve 7 can be dispensed with.
  • the advantage of this arrangement is the saving in control piping for circuit breakers with double nozzles which are kept under pressure when in the open condition.
  • an air-blast circuit breaker comprising a casing establishing therein a switch chamber which is continuously subjected to a lling with compressed air, a pair of tubular contact members arranged co-axially within said switch chamber, said tubular contact members including nozzle type inlets at one end thereof adapted to engage each other, one of said contact members being stationary and the other movable and including a spring loaded piston member always having one side thereof exposed to the pressure of the air within said switch chamber, a first housing located within said switch chamber and which includes a cylinder for said piston in one part thereof and a valve chamber in .another part thereof in communication with the other end of said movable contact member and also with the other side of said piston member, a first spring loaded exhaust valve in said valve chamber, said exhaust valve being closed to close oitsaid valve chamber when the nozzle ends of said contact members are engaged and actuata'bie to an open position to vent said valve chamber and the interior of said movable contact member to atmosphere when it is desired to effect disengagement of said contact members,

Landscapes

  • Multiple-Way Valves (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US242481A 1961-12-07 1962-12-05 Air-blast circuit breaker with double nozzle Expired - Lifetime US3206582A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1420761A CH389061A (de) 1961-12-07 1961-12-07 Druckgasschalter mit Doppeldüse

Publications (1)

Publication Number Publication Date
US3206582A true US3206582A (en) 1965-09-14

Family

ID=4398818

Family Applications (1)

Application Number Title Priority Date Filing Date
US242481A Expired - Lifetime US3206582A (en) 1961-12-07 1962-12-05 Air-blast circuit breaker with double nozzle

Country Status (4)

Country Link
US (1) US3206582A (ja)
BE (1) BE625691A (ja)
CH (1) CH389061A (ja)
DE (1) DE1169553B (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3291946A (en) * 1963-06-28 1966-12-13 Bbc Brown Boveri & Cie Gas-blast circuit breaker with means for throttling gas flow during a switching-out operation
US3471667A (en) * 1967-07-21 1969-10-07 Gen Electric Double exhaust gas blast circuit breaker

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007031949A1 (de) * 2007-07-06 2009-01-08 Siemens Ag Schaltgeräteanordnung mit einem Abströmkanal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574334A (en) * 1940-04-06 1951-11-06 Merlin Gerin 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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB812198A (en) * 1956-09-18 1959-04-22 Gen Electric Co Ltd Improvements in or relating to methods of and apparatus for detecting leaks in apparatus such as heat exchangers
CH296565A (de) * 1948-09-21 1954-02-15 Calor Emag Elektrizitaets Ag Verfahren zum Betrieb von Schaltern mit Lichtbogenlöschung durch eine vorbestimmte, unabhängig von der Höhe des abzuschaltenden Stromes erzeugte Löschmittelströmung sowie Vorrichtung zur Durchführung des Verfahrens.
USRE25631E (en) * 1951-02-09 1964-08-18 Air blast circuit breaker
US2665351A (en) * 1951-02-09 1954-01-05 Asea Ab Arrangement in air blast circuit breaker provided with damping resistance
GB764647A (en) * 1954-02-17 1956-12-28 Asea Ab Improvements in air blast electric circuit breakers
US2881291A (en) * 1955-12-15 1959-04-07 Asea Ab Air blast circuit breaker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574334A (en) * 1940-04-06 1951-11-06 Merlin Gerin 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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3291946A (en) * 1963-06-28 1966-12-13 Bbc Brown Boveri & Cie Gas-blast circuit breaker with means for throttling gas flow during a switching-out operation
US3471667A (en) * 1967-07-21 1969-10-07 Gen Electric Double exhaust gas blast circuit breaker

Also Published As

Publication number Publication date
DE1169553B (de) 1964-05-06
BE625691A (ja)
CH389061A (de) 1965-03-15

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