US2417274A - Gas blast circuit breaker - Google Patents

Gas blast circuit breaker Download PDF

Info

Publication number
US2417274A
US2417274A US522935A US52293544A US2417274A US 2417274 A US2417274 A US 2417274A US 522935 A US522935 A US 522935A US 52293544 A US52293544 A US 52293544A US 2417274 A US2417274 A US 2417274A
Authority
US
United States
Prior art keywords
valve
gas
circuit breaker
switch chamber
pressure gas
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
US522935A
Other languages
English (en)
Inventor
Thommen Hans
Halm Alfred
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
Original Assignee
Bbc Brown Boveri & Cie
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 & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US2417274A publication Critical patent/US2417274A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
    • H01H33/82—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas
    • H01H33/83—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas wherein the contacts are opened by the flow of air or gas
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/785—With retarder or dashpot
    • Y10T137/7852—End of valve moves inside dashpot chamber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87917—Flow path with serial valves and/or closures

Definitions

  • the present invention concerns gas blast circuit breakers with one or moreA points of interruption which are located in switch chambers having discharge openings for the gas, these openings being capable of being closed by means of valves.
  • the object of closing the discharge openings of the switch chambers is to enable the contacts of the points of interruption to be kept open when pressure gas is present, so that the danger of voltage hash-overs is reduced and a saving in pressure gas is achieved.
  • the present invention therefore deals with a gas blast circuit breaker with one or more points of interruption of which the contacts are located in switch chambers of insulating material with metallic end elements, one of these end elements possessing openings for the discharge of the pressure gas and a valve for closing these openings, this valve being maintained in its initial position by a spring and moved out oi' this position by means of the outiiowing gas.
  • the switch chamber which contains the contacts of a point of an interruption of a gas blast circuit breaker with single or multiple interruption, consists of a hollow insulator a, with metallic end parts b which allow the pressure gas to enter the switch chamber and possess discharge openings or channels e, e1 which runs substantially radially from the inside to the outside of the insulator and serve to conduct away the pressure gas from the separation point of the contacts. These discharge openings e, e1 can be closed by a valve f. At least one of the contacts c, d of a point of interruption is a hollow contact. In the constructional examples illustrated the moveable pin contact d co-operates with the stationary hollow contact c.
  • the contacts c, d are arranged centrally on both sides of the metallic element b in such a manner that together they form a constructional unit, these units being capable of multiplication when they have to serve as the points of interruption for a circuit breaker with multipie interruption and having switch chambers arranged in series.
  • the superiiuous contact element can be omitted.
  • the valve consists of a circular disc f which by means oi the spring g is held in its initial position where it keeps the discharge channel e and discharge opening e1 for the pressure gas closed.
  • the valve is opened by the pressure gas, which after it has opened the contacts c, d and subjected the arc formed between these contacts to a gas blast, discharges through the channel e.
  • the pressure of the discharging gas then exceeds the pressure of the spring g and the valve reaches its open position which is limited by the stop h.
  • valve f shuts ofi' an air storage space z' which by means of a central opening 7c in the valve disc is in communication with the discharge channel e and is filled by the gas discharging from the switch chamber.
  • the volume of the space z' determines the time required for the valve to reverse itsl direction of motion due to the eect or the pressure of the gas stored in the space i, whereby the valve is returned to its initial position where it closes the discharge channel e.
  • the return of the valve f is achieved at the beginning of the return movement by the pressure difference resulting from the difference between the cross-sectional area of the discharge channel e and the area of the opening of the storage space z determined by the limiting edge h, this difference in areas being supported by the spring g.
  • Valve f is thus moved from its initial position to its end position by the gas discharging ,from the switch chamber and after a certain time has lapsed it is moved back again into its initial position, this cycle of operation then repeating itself.
  • the time required for this operation can be selected as desired and is fixed by the volume of the storage space z' which thus acts as a time element. It is expedient to provide protective Awalls m on the face of the valvey in order to protect the sliding surface of the valve against deposits from the gas discharged from the switch chamber.
  • the switch chamber can possess one or more discharge openings which are distributed along its periphery and are provided with separate valves.
  • valve is a ring valve f1 with at least one bore 7c whose surface lies perpendicular to the axis of the switch chamber a containing the contacts c, d.
  • the method of operation is the same as with the arrangement shown in Fig. 1.
  • the opening 7c can be omitted if the annular valve disc has sufcient clearance;
  • FIG. 3 A modified form of the invention is illustrated in Fig. 3 where the valve consists of a springloaded open ring with overlapping edges.
  • the effective surface of the annular disc lies parallel to the axis of the switch chamber a. containing the switch contacts.
  • the valve is also openedby the spring ring being expanded by the gas discharging from, the switch chamber, and then after a certain time, which is determined by the volume of the storage space i, the valve is closed again by the pressure which acts on the other side of the ring and causes it to return to its original position.
  • valve shown in Fig. 1 is of course not restricted to the circular shape shown; any other suitable shape can be chosen.
  • a gas blast circuit breaker comprising a tubular switch chamber formed of insulating material, a metallic end closure for said switch chamber, a hollow contact on said end closure, said end closure being provided with an internal conduit for carrying pressure gas admitted thereto through said hollow contact, said conduit being provided with an exhaust port opening to the atmosphere, a movable contact in said switch chamber adapted to engage said hollow contact and normally biased into engagement with said hollow contact, said movable contact being adapted to be disengaged from said hollow contact by pressure gas entering said switch chamber and a valve for closing the exhaust port of said conduit, said valve comprising a member normally biased to an exhaust port closing position and adapted to be opened by the ow of pressure gas from said chamber into said conduit, a housing in which said member is adapted to reciprocate and cooperating therewith in the open position thereof to provide a pressure gas storage space, said member being provided with a bleed port communieating with said gas storage space, whereby the gas pressures acting on said member will be gradually equalized by the pressure gas filling said storage space so that the normal bias
  • a device as claimed in claim 1 in which said member oi said valve is provided with a blast deflecting skirt whereby the gas blast is prevented from depositing foreign material on the housingr wall and obstructing the movement of said member.

Landscapes

  • Circuit Breakers (AREA)
US522935A 1943-02-18 1944-02-18 Gas blast circuit breaker Expired - Lifetime US2417274A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH576989X 1943-02-18

Publications (1)

Publication Number Publication Date
US2417274A true US2417274A (en) 1947-03-11

Family

ID=4521268

Family Applications (1)

Application Number Title Priority Date Filing Date
US522935A Expired - Lifetime US2417274A (en) 1943-02-18 1944-02-18 Gas blast circuit breaker

Country Status (6)

Country Link
US (1) US2417274A (enrdf_load_stackoverflow)
BE (2) BE576989A (enrdf_load_stackoverflow)
CH (1) CH232447A (enrdf_load_stackoverflow)
FR (1) FR902809A (enrdf_load_stackoverflow)
GB (1) GB576989A (enrdf_load_stackoverflow)
NL (1) NL60926C (enrdf_load_stackoverflow)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2018136A (en) * 1930-01-12 1935-10-22 Lange Emil Electric switch
US2196247A (en) * 1938-10-18 1940-04-09 Wright Aeronautical Corp Supercharger relief valve
US2197148A (en) * 1937-06-03 1940-04-16 United Aircraft Corp Backfire door
US2221720A (en) * 1937-08-25 1940-11-12 Gen Electric Electric circuit interrupter
US2279536A (en) * 1938-05-27 1942-04-14 Bbc Brown Boveri & Cie Electric circuit breaker
US2345724A (en) * 1942-03-19 1944-04-04 Westinghouse Electric & Mfg Co Circuit breaker

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2018136A (en) * 1930-01-12 1935-10-22 Lange Emil Electric switch
US2197148A (en) * 1937-06-03 1940-04-16 United Aircraft Corp Backfire door
US2221720A (en) * 1937-08-25 1940-11-12 Gen Electric Electric circuit interrupter
US2279536A (en) * 1938-05-27 1942-04-14 Bbc Brown Boveri & Cie Electric circuit breaker
US2196247A (en) * 1938-10-18 1940-04-09 Wright Aeronautical Corp Supercharger relief valve
US2345724A (en) * 1942-03-19 1944-04-04 Westinghouse Electric & Mfg Co Circuit breaker

Also Published As

Publication number Publication date
GB576989A (en) 1946-04-30
BE576989A (fr) 1959-09-23
FR902809A (fr) 1945-09-13
CH232447A (de) 1944-05-31
BE454451A (enrdf_load_stackoverflow) 1900-01-01
NL60926C (enrdf_load_stackoverflow) 1900-01-01

Similar Documents

Publication Publication Date Title
US2331441A (en) Electric switching arrangement
US3131718A (en) Pressure relief valve
US2786119A (en) Valve arrangement for air blast circuit breakers
US2724751A (en) Air blast circuit breaker
US2803724A (en) Operating device for air blast circuit breakers
US2417274A (en) Gas blast circuit breaker
US2972666A (en) Air blast circuit breakers with breaking gaps in compressed air containers carried by insulator pillars
US3218421A (en) Gas blast circuit breaker having actuating means responsive to differential pressure
GB983501A (en) Improvements in or relating to gas-blast electric circuit-breakers
US2969446A (en) Air blast circuit breakers
US2786117A (en) Air blast circuit breaker with parallel resistances
US3286066A (en) Gas blast circuit breaker with spring mounted hollow contact member and associated exhaust valve controlled thereby
US3118996A (en) Contact operating means for air blast circuit breaker
US2554974A (en) Electric circuit breaker
US3339046A (en) Blast valve arrangement for compressed gas operated circuit breakers
US1873969A (en) Switch
US3206582A (en) Air-blast circuit breaker with double nozzle
US2874242A (en) Fluid-pressure controlled operating mechanism for a circuit breaker
US2969447A (en) Air blast circuit breakers
GB1164543A (en) Slide Valve for Gas Blast Breakers
GB615030A (en) Improvements in or relating to operating means for gas-blast electric switches
US3564177A (en) Dual gas-blast circuit interrupter in which one of two exhaust valves operates automatically
GB563641A (en) Improvements in or relating to pneumatically actuated electric circuit interrupters
US3108168A (en) Device for air blast circuit breaker
US3522400A (en) Annular sliding valve for air blast circuit breaker