US2969447A - Air blast circuit breakers - Google Patents

Air blast circuit breakers Download PDF

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Publication number
US2969447A
US2969447A US735619A US73561958A US2969447A US 2969447 A US2969447 A US 2969447A US 735619 A US735619 A US 735619A US 73561958 A US73561958 A US 73561958A US 2969447 A US2969447 A US 2969447A
Authority
US
United States
Prior art keywords
contact
valve
container
movable contact
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
US735619A
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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 US2969447A publication Critical patent/US2969447A/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
    • H01H33/80—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
    • 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
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/32—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator pneumatic

Definitions

  • the present invention concerns a circuit breaker of the kind having a plurality of containers filled with compressed air arranged on pillar insulators. In said containers breaking gaps are arranged, the stationary contact of which is carried by a leading through insulator projecting into the container. Its movable contact, which is provided with an outlet channel for the extinguishing air, is carried by an operating mechanism attached to the said container.
  • the invention is chiefly characterized in that the movable contact consists of a pipe formed member joined with an operating piston, which member is provided with a valve disc concentric with the outlet channel, and with an axial channel leading from a space on one side of the operating piston and terminating on the surface of the valve disc between the tightening surface and the inner opening of the outlet channel.
  • the valve disc which is joined with the movable contact, tightens against the valve seat, which is carried by the said leading through insulator and is concentric with the contact members of the stationary contact.
  • the valve seat has a diameter larger than that of the stationary contact, so that the sealing means of the air blast valve will be in front of the contact gap in the direction of the air blast from the container.
  • the operating mechanism for a movable contact With an outlet channel having an area larger than the outlet opening at the breaking gap can be made very simple and the whole operation can be performed by a single operating valve, i.e. an operating valve at the lower end of the carrying insulator.
  • This simplification is reached because the force acting on the movable contact in opening direction, which is generated by the pressure in the container, is entirely or partly compensated by the fact that the container and a space on the one side of the operating piston are in communication with each other, when the breaking gap is open. This equilibrium of the forces will automatically be independent of the pressure variations in the container, which is a very great advantage.
  • the movab'e contact is moved back to the closed position by a spring, although it is possible to dimension the mechanism in such a way that the air pressure acting in closing direction on the operating piston may assist in moving back the contact to its closed position.
  • the said spring is therefore given only such a strength that is able to exert a sufficient contact pressure, if the air pressure in the container should disappear.
  • FIG. 1 designates a compressed air container carried by a pillar insulator, not shown in the figure, by which it will be in permanent communication with a compressed air source.
  • a leading through insulator 2 which is attached to the container 1 by means of the flange 3 and the bolts 4, carries the stationary contact of the breaking gap, which is built up by a number of contact blocks 6 arranged in a disc 5, which are ice actuated in a direction towards the movable contact of the breaking gap by the springs 7.
  • the disc 5 is joined with the leading through bolt 8 and is forced against the sealing ring 9 between the disc 5 and the flat end surface of the insulator 2.
  • the innermost part of the leading through insulator is designed as an arcing contact 10.
  • the disc 5 serves as a valve seat for the air blast valve and is provided with an annularly formed sealing ring 11.
  • the movable contact 12 of the breaking gap is formed as a pipe and provided with a large outlet channel 13 for the air blast.
  • the movable contact carries a valve disc, which in the closed condition of the break ing gap seals tightly against the ring 11.
  • the air blast valve is thus on the up-stream side of the breaking gap.
  • the movable contact is provided at its lower part with a piston 14', which is movably arranged in a housing 15 attached to the lower part of the container 1 by means of bolts 16.
  • 17, 18, 19 and 20 are sealing rings and 21 elements transferring current from the housing 15 to the movable contact 12.
  • 22 is an elastic member limiting the motion of the movable contact.
  • the spring 23 actuates the movable contact 12 and the valve disc 14" in direction towards the contact blocks of the stationary contact and the sealing ring 11.
  • the space 24 above the piston 14' is by the channel 25 in the housing and the channel 26 in the container 1 as well as by conductors, not shown in the figure, in communication with a control valve for the operation of the breaking gap.
  • the space 27 below the piston 14 communicates through the channel 28 in the movable contact 12 with the space 29 between the disc 5 and the upper part of the movable contact 12.
  • the operating mechanism acts in the folowing way:
  • the breaking gap When the breaking gap is closed, the space 24 is, through channel 26 and said control valve, not shown, in communication with the surrounding atmosphere.
  • the space 27 is by the channel 28, the space 29, the openings be tween the contact blocks 6 and the channel 13 also in communication with the surrounding atmosphere.
  • the movable contact 12 and the valve disc 14" joined with it will then be forced against the disc 6 of the stationary contact and the valve seat 11.
  • the breaking gap will be opened when the space 24 above the piston 14' is supplied with operating air from a compressed air source through said air bfast control valve, not shown on the figure, so that the force acting on the piston 14' will be able to move the contact to its lower position.
  • An air blast circuit breaker having a container permanently fi'led with compressed air, said breaker comprising a leading through insulator projecting into the said container, a stationary contact carried by said insulator, a movable contact enclosed in the container and formed with an outlet channel therein for the escape of extinguishing air from the container, said outlet channel having an inlet opening facing the stationary contact, an operating piston connected to the movable contact, means 3 to supply fluid under pressure to one side of said piston to move the movable contact away from the stationary contact, a blast valve comprising a valve disc with a tightening surface formed around the inlet opening and a valve seatfor said valve disc formed on the stationary contact,
  • valve disc operatively engaging said valve disc to move it toward said valve seat, said valve disc being in fixed relation to the operating piston, said movable contact having an orifice therein between the tightening surface and the inlet opening in permanent communication with said outlet channel and having a channel therein leading from the other side or the operating piston to Said orifice.

Landscapes

  • Safety Valves (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US735619A 1957-05-23 1958-05-15 Air blast circuit breakers Expired - Lifetime US2969447A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE828589X 1957-05-23

Publications (1)

Publication Number Publication Date
US2969447A true US2969447A (en) 1961-01-24

Family

ID=20349426

Family Applications (1)

Application Number Title Priority Date Filing Date
US735619A Expired - Lifetime US2969447A (en) 1957-05-23 1958-05-15 Air blast circuit breakers

Country Status (4)

Country Link
US (1) US2969447A (de)
DE (1) DE1048981B (de)
FR (1) FR1196255A (de)
GB (1) GB828589A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1297821A (fr) * 1961-05-19 1962-07-06 Merlin Gerin Disjoncteur à gaz comprimé et procédé de sa fabrication
DE1266853B (de) * 1962-09-26 1968-04-25 Licentia Gmbh Druckgasschalter mit einer Leistungsschaltstelle und einer in Reihe liegenden Spannungstrennstelle
DE1291405B (de) * 1965-05-04 1969-03-27 Magrini Fab Riun Scarpa Druckgas-Leistungsschalter
NL126949C (de) * 1967-04-14 1967-04-14

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2459600A (en) * 1944-12-14 1949-01-18 Westinghouse Electric Corp Compressed gas circuit interrupter
AT179584B (de) * 1951-05-30 1954-09-10 Licentia Gmbh Elektrischer Stromunterbrecher, insbesondere Schalter, mit Lichtbogenlöschung durch ein strömendes Druckmittel, wie Druckgas
FR1123717A (fr) * 1955-03-15 1956-09-26 Comp Generale Electricite Disjoncteur à air comprimé

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB764647A (en) * 1954-02-17 1956-12-28 Asea Ab Improvements in air blast electric circuit breakers
US2803724A (en) * 1954-06-04 1957-08-20 Asea Ab Operating device for air blast circuit breakers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2459600A (en) * 1944-12-14 1949-01-18 Westinghouse Electric Corp Compressed gas circuit interrupter
AT179584B (de) * 1951-05-30 1954-09-10 Licentia Gmbh Elektrischer Stromunterbrecher, insbesondere Schalter, mit Lichtbogenlöschung durch ein strömendes Druckmittel, wie Druckgas
FR1123717A (fr) * 1955-03-15 1956-09-26 Comp Generale Electricite Disjoncteur à air comprimé

Also Published As

Publication number Publication date
FR1196255A (fr) 1959-11-23
GB828589A (en) 1960-02-17
DE1048981B (de) 1959-01-22

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