US2240233A - Gas blast circuit breaker - Google Patents

Gas blast circuit breaker Download PDF

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Publication number
US2240233A
US2240233A US317752A US31775240A US2240233A US 2240233 A US2240233 A US 2240233A US 317752 A US317752 A US 317752A US 31775240 A US31775240 A US 31775240A US 2240233 A US2240233 A US 2240233A
Authority
US
United States
Prior art keywords
contact
circuit breaker
electrode
chamber
pressure
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
US317752A
Other languages
English (en)
Inventor
Thommen Hans
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 US2240233A publication Critical patent/US2240233A/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
    • H01H33/16—Impedances connected with contacts
    • H01H33/164—Impedances connected with contacts the impedance being inserted in the circuit by blowing the arc onto an auxiliary electrode
    • 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
    • H01H33/16—Impedances connected with contacts

Definitions

  • the invention relates to fiuid blast circuit breakers and to arc extinguishing means therefor.
  • the invention has particular referenceto a after the switching arc has been extinguished is improved when the escaping air blast is directed toward the auxiliary spark gap.
  • a after the switching arc has been extinguished is improved when the escaping air blast is directed toward the auxiliary spark gap.
  • Another object of the invention is to provide a gas blast circuit breaker with an auxiliary spark gap in series with the main arcing contacts in which one electrode of said spark gap comprises means for throttling the discharge passage through which thev pressure blast escapes.
  • a further object of the invention is to provide a gas blast circuit breaker with arcing contacts and a tubular discharge chamber leading from the arcing contacts in combination with an auxiliary spark gap disposed in said discharge chamber in which the electrode of said spark gap nearest the outlet end of said discharge chamber is formed'as an annular disc which throttles the passage'leading to said outlet end.
  • Fig. 1 is a central longitudinal section through a circuit breaker embodying the invention
  • Fig. 2 is a plan view of the throttling electrode.
  • I indicates an arcing chamber which is provided Withan inlet fitting 2 through which fluid, such as air, under pressure is "admitted.
  • the compressed fiuid from a suitable source of supply, such as a storage receptacle or compressed gas generator, is admitted to the pressure chamber I under control of a valve, not shown, which may be operated manually or by automatic means responsive to an overload condition of the circuit.
  • the chamber I preferably cylindrical in form, may be made of metal, as shown, and is mounted on an insulator 3. If desired, the chamber could itself be formed of insulating material.
  • the part 4 forming the upper wall of the chamher I is formed with an axialopening in which is mounted the fixed contact 5 of the circuit breaker, this contact being in the form of an annular nozzle flaring or widening towards the discharge side thereof.
  • a movable switch contact 6 coaxial with the nozzle contact 5 is mounted on an axially movable post I carried by a piston 8 operating in cylinder 9.
  • the contact 6 is normally resiliently held in engagement with the nozzle contact 5 by a resilient spring Ill acting between the wall I I of the cylinder 9 and the contact 6, which latter is shaped to close the opening through the nozzle contact.
  • An arc collector contact I2 is mounted in the discharge chamber I3 axially aligned with the contacts 5 and 6 and spaced therefrom in the direction of discharge of the pressure from chamher I.
  • This contact I2 serves also as one electrode of an auxiliary spark gap I4.
  • the other electrode I5 of the spark gap, furthest removed from the arcing contacts 5 and 6, is in the form of an annular disc or inverted apertured cuplike member which acts as a throttle, restricting the passage through the discharge chamber I3.
  • the axial aperture I50, in the annular disc I5 acts as a nozzle through which the pressure blast must pass in traveling from the chamber I to the atmosphere.
  • a directing baflle ring I6 having an axial opening and tapering walls directed toward the spark gap-I4 is mounted in the discharge chamber I3 for directing the fluid under pressure escaping from the pressure chamber upon opening of the contacts 5 and 6, towardthe central aperture I5a of the disc electrode I5.
  • the disc electrode I 5 is connected by means of I an integral arm I! and bolt II to one side of the switch protecting resistance l9, which is preferably made of Resorbit" in the form of a cylinder carried on the insulating tube 2
  • the other side of s the resistance I9 is connected by a lead 2
  • circuit being completed by connecting the other side of the disconnect switch to the other terminal of the circuit.
  • the circuit breaking operation is completed by opening the disconnect switch, whereupon the fluid pressure valve can be closed. However, if after extincdisc i5. After extinction of the arc, the disconnect switch is opened and the flow of compressed fluid cut off.
  • a fluid blast circuit breaker including an arcing chamber having a nozzle contact and a pressure operated movable contact cooperating therewith, means for introducing fluid under pressure into said arcing chamber, a discharge chamber leading from said nozzle contact, an auxiliary electrode coaxially of said nozzle contact and electrically connected to the same, means for throttling the passage through said discharge chamber comprising a throttling electrode disposed in said discharge chamber and positioned to form a spark gap with said auxiliary electrode, and a protective resistance connee-ted across said throttling electrode and said movable contact.
  • a fluid blast circuit breaker including an arcing chamber having a nozzle contact and a pressure operated movable contact cooperating therewith, means for introducing fluid under pressure into said arcing chamber, a discharge chamber leading from said nozzle contact, an auxiliary electrode coaxially of said nozzle contact, a throttling electrode disposed in said discharge chamber beyond said auxiliary electrode in the direction of flow of pressure fluid, said throttling electrode having a nozzle aperture for the passage of the escaping fluid under pressure tion of the are as the arc current passes through zero the voltage rise on the next half cycle is very sharp, the spark gap M will come into operation to insert the resistance l9 across the arcing contacts, thus damping the voltage rise and lowering the value of the arc current flowing between the contacts 6, l2 and I5 such that the arc may readily be extinguished.
  • the throttling eflect of annular disc electrode l5 prevents a rapid drop in pressure in the discharge chamber and the "luminous arc across the spark gap l4 between contact [2 and, electrode [5 is cooled on all sides and is rapidly deionized by the air escaping through the central aperture I511 due to the building up of the pressure in the discharge chambcr,;on the pressure side of the and positioned to form a spark gap with said auxiliary electrode, and a protective resistance connected across said throttling electrode and said movable contact.
  • a fluid blast circuit breaker including an arcing chamber having a nozzle contact and a pressure operated movable contact cooperating therewith, means for introducing fluid under pressure into said arcing chamber, a discharge chamber leading from said nozzle contact, an auxiliary electrode coaxially of said nozzle contact, a throttling electrode disposed in said discharge chamber beyond said auxiliary electrode in the direction of flow of pressure fluid, said throttling electrode comprising an annular disc having a restricted central aperture for the passage of escaping fluid under pressure and positioned to form a spark gap with said auxiliary electrode, and a protective resistance connected across said throttling electrode and said movable contact.

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  • Circuit Breakers (AREA)
US317752A 1938-05-27 1940-02-07 Gas blast circuit breaker Expired - Lifetime US2240233A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE209744X 1938-05-27
DE2240233X 1938-11-17

Publications (1)

Publication Number Publication Date
US2240233A true US2240233A (en) 1941-04-29

Family

ID=32070564

Family Applications (1)

Application Number Title Priority Date Filing Date
US317752A Expired - Lifetime US2240233A (en) 1938-05-27 1940-02-07 Gas blast circuit breaker

Country Status (6)

Country Link
US (1) US2240233A (pt)
BE (2) BE434537A (pt)
CH (2) CH209744A (pt)
FR (2) FR855173A (pt)
GB (2) GB529453A (pt)
NL (1) NL49538C (pt)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449208A (en) * 1945-01-26 1948-09-14 Bbc Brown Boveri & Cie Circuit breaker
US2470628A (en) * 1944-05-24 1949-05-17 Westinghouse Electric Corp Circuit interrupter
US2500429A (en) * 1942-02-19 1950-03-14 Nijland Hendrik A Hidde Electric gas blast circuit breaker
US2599100A (en) * 1942-05-29 1952-06-03 Asea Ab Compressed air circuit breaker with a plurality of series connected breaking gaps
US2625627A (en) * 1947-02-27 1953-01-13 Canadian Controllers Ltd High-voltage contactor system
US2887550A (en) * 1956-02-15 1959-05-19 Coq Nv Gas-blast circuit breakers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE955618C (de) * 1952-03-14 1957-01-03 Licentia Gmbh Druckgaschalter, insbesondere zum Abschalten hoher Spannungen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2500429A (en) * 1942-02-19 1950-03-14 Nijland Hendrik A Hidde Electric gas blast circuit breaker
US2599100A (en) * 1942-05-29 1952-06-03 Asea Ab Compressed air circuit breaker with a plurality of series connected breaking gaps
US2470628A (en) * 1944-05-24 1949-05-17 Westinghouse Electric Corp Circuit interrupter
US2449208A (en) * 1945-01-26 1948-09-14 Bbc Brown Boveri & Cie Circuit breaker
US2625627A (en) * 1947-02-27 1953-01-13 Canadian Controllers Ltd High-voltage contactor system
US2887550A (en) * 1956-02-15 1959-05-19 Coq Nv Gas-blast circuit breakers

Also Published As

Publication number Publication date
GB531650A (en) 1941-01-08
BE435345A (pt)
CH209744A (de) 1940-04-30
NL49538C (pt) 1940-10-15
BE434537A (pt) 1939-06-30
FR50768E (fr) 1931-03-26
GB529453A (en) 1940-11-21
CH212030A (de) 1940-10-31
FR855173A (fr) 1940-05-04

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