US3134875A - Rebound preventing means in air blast circuit breaker - Google Patents

Rebound preventing means in air blast circuit breaker Download PDF

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Publication number
US3134875A
US3134875A US91210A US9121061A US3134875A US 3134875 A US3134875 A US 3134875A US 91210 A US91210 A US 91210A US 9121061 A US9121061 A US 9121061A US 3134875 A US3134875 A US 3134875A
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US
United States
Prior art keywords
contact
container
space
movable contact
circuit breaker
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
US91210A
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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 US3134875A publication Critical patent/US3134875A/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
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/60—Mechanical arrangements for preventing or damping vibration or shock
    • H01H3/605—Mechanical arrangements for preventing or damping vibration or shock making use of a fluid damper
    • 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

Definitions

  • This invention relates to air blast circuit breakers, and more specifically relates to a novel means for controlling the opening speed of the movable contact of an air-blast circuit breaker.
  • a means for controlling the velocity of the movable contact at the end of it's's'troke where the motion of the contact at 'the beginningof the contact opening interval is substantially unimpeded so that desirably high velocities 1 can be'obtained'during the initial contact opening period,
  • the movable contact is provided with a piston which moves within a cylinder.
  • the piston defines two volumes.
  • the first space is normally in communication within the interior of the contact container, and its pressure will remain relatively independent of the volume defined by the piston as the piston moves within the cylinder.
  • the second space on the other side of the piston is connected to areas within the interrupter container by a small orifice whereby, as the movable contact is moved to its disengaged position, this latter space will increase so that the pressure of the space is 3,134,875 Patented May 26, 1964 decreased.
  • the force driving the movable contact is, therefore, a function of the differential pressure on either side of the piston where one of these pressures is relatively constant, while the other pressure is a constantly decreasing pressure. Therefore, the motion of the contact is controlled due to a decrease in pressure on the driving side of the piston rather than by causing the piston to drive against an increasingly higher pressure air cushion whereby bouncing problems are better controlled.
  • a primary object of this invention is to provide a novel means for controlling the motion of the movable contact of an air blast circuit breaker.
  • Another object of this invention is to provide novel means for the contacts of an air blast circuit breaker which will decrease the velocity of the movable contact prior to the time that the movable contact reaches a fully disengaged position.
  • Another object of this invention is to prevent rebound of the movable contact of an air blast circuit breaker.
  • a still further object of this invention is to decrease the kinetic energy of the movable contact in an air blast circuit breaker when the movable contact reaches the end of its opening stroke.
  • FIGURE 1 shows a cross-sectional view of the contact structure of an airblast circuit breaker constructed in accordance with the present invention.
  • FIGURE 2 graphically illustrates the contact position of the movable contact of FIGURE 1 as a function of time in solid lines, as contrasted to the prior artl ype movable contact illustrated in dotted lines.
  • FIGURE 3 shows the contact velocity-of the movable contact of FIGURE 1 as a function of time in solid lines as contrasted to the prior type devices illustrated in dotted lines.
  • FIGURE 1 I have shown the main breaking'gap of a typical air blast circuit breaker which includes an insulating container 1 which carries a stationary contact 2 (partially shown), and a movable contact 3 formed of a conductive tubular member having opening 4 which extends centrally through movable con- I tact'3.
  • An upper conductive cap is secured to'container land has an orifice 5a therein which is in communication with the external atmosphere.
  • a flexible'insert 5 is at the top of the cap for receiving the upperend of contact 3 when contact 3 is moved to its disengaged position.
  • Movable contact 3 is biased toward its closed position shown in FIGURE 1 by a compression spring 6.
  • movable contact 3 is then provided with an outercollar or flange which serves as a piston in accordance with the present invention, and is movable within cylinder 8.
  • Th'e piston 7 defines a space 9 within cylinder 8 which,
  • Piston 7 defines a space 9 within cylinder 8 which is in communication with the interior of the container through the small orifice 10, whereas relatively large openings 11 permit ready communication between space 12 and the space enclosed by container 1.
  • movable contact 3 contains a relatively small channel 13 which communicates between space 9 and the space enclosed by container 1 which would include space 12 within cylinder 8. Note that channel 13 is cut on from this external space when contact 3 moves a predetermined small dismoves downward.
  • a source of relatively high pressure air is connected to container 1.
  • the contact 3 then begins to move up:
  • the final velocity of the movable contact is thus substantially decreased at the end of the motion of the contact so that, asthe upper end of contact 3 seats against member 5, to seal off channel 4 from orifice 5 there will be a minimum of bounce.
  • FIGURE 2 I have illustrated the relationship between time and contact position for the case of the usual 'type of circuit breaker contact shown in dotted lines, while the novel control structure of the present invention is shown in solid lines. It will be seen in FIGURE 2 that when usi g the c n o m n o the in enticn he contact opens at a time later than is the usual case. However, during the critical period in which the contact is initially moved, there is substantially no difference between the characteristics of the usual type of circuit breaker contact and the circuit breaker contact of the present invention.
  • the final contact velocity is less than /2 of the usual final velocity, whereby the kinetic energy of the movable contact will be less than A that contained by a contact driven by prior art means.
  • a contact velocity control means for an airblast circuit breaker having a contact movable between engaged and disengaged positions and a container adapted to be filled with airunder pressure, said contact being movably mounted in the container, said control means comprising a cylinder element and a piston element slid- -able in the cylinder element, said piston element defining first and second spaces within the cylinder element on opposite sides of the piston element, one of said elements being secured to the container and the other to the-movable contact, said first space being substantially closed off from the interior of the container, said first space inpassage.

Landscapes

  • Fluid-Pressure Circuits (AREA)
  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US91210A 1960-02-27 1961-02-23 Rebound preventing means in air blast circuit breaker Expired - Lifetime US3134875A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE200960 1960-02-27

Publications (1)

Publication Number Publication Date
US3134875A true US3134875A (en) 1964-05-26

Family

ID=20259220

Family Applications (1)

Application Number Title Priority Date Filing Date
US91210A Expired - Lifetime US3134875A (en) 1960-02-27 1961-02-23 Rebound preventing means in air blast circuit breaker

Country Status (4)

Country Link
US (1) US3134875A (de)
CH (1) CH383467A (de)
DE (1) DE1203855B (de)
GB (1) GB924613A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3614357A (en) * 1969-05-08 1971-10-19 Ite Imperial Corp Gas blast circuit interrupter using main movable contact as blast valve
US3629532A (en) * 1970-02-20 1971-12-21 Sun Electric Corp Immediately responsive fluid flow operated switch with normally closed spring contact in flow channel
EP1939908A1 (de) * 2006-12-29 2008-07-02 ABB Technology Ltd Verfahren für den Betrieb eines Schutzschalters

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2015792A (en) * 1933-03-31 1935-10-01 John G Flanigan Starting control system for automobile engines
US2025549A (en) * 1934-08-28 1935-12-24 Gen Electric Operating mechanism for electric circuit breakers
US2572406A (en) * 1948-09-02 1951-10-23 Stulz Charles High-voltage oil circuit breaker
US2574334A (en) * 1940-04-06 1951-11-06 Merlin Gerin Air-blast circuit breaker
US2592079A (en) * 1948-07-31 1952-04-08 Bbc Brown Boveri & Cie Compressed gas operated circuit breaker
US2919329A (en) * 1956-07-10 1959-12-29 Merlin Gerin Air blast circuit breakers
US3071670A (en) * 1959-07-01 1963-01-01 Westinghouse Electric Corp Circuit interrupters

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE616271C (de) * 1931-03-30 1935-07-24 Siemens Schuckertwerke Akt Ges Druckluftantrieb fuer Expansionsschalter
DE609723C (de) * 1933-08-03 1935-02-22 Fritz Faudi Federungs- und Stossdaempfungseinrichtung fuer Fahrzeuge
DE648477C (de) * 1935-11-25 1937-08-06 Frida Strauss Geb Ruppel Elektrischer Schalter mit Lichtbogenloeschung durch ein Druckmittel
DE698809C (de) * 1938-07-17 1940-11-18 Voigt & Haeffner Akt Ges Aus einem Zylinder mit Kolben bestehende Daempfungspumpe, insbesondere fuer Anlass-vorrichtungen, in Verbindung mit elektrischen Schaltgeraeten
DE706662C (de) * 1938-12-25 1941-05-31 Aeg Fluessigkeitsbremse fuer elektrische Hochleistungsschalter
DE853770C (de) * 1949-07-24 1952-10-27 Voigt & Haeffner Ag Daempfungspumpe fuer elektrische Schalter
US2665351A (en) * 1951-02-09 1954-01-05 Asea Ab Arrangement in air blast circuit breaker provided with damping resistance
DE914026C (de) * 1952-02-23 1954-06-24 Voigt & Haeffner Ag Fluessigkeitsbremse zur Regelung der Schaltgeschwindigkeit elektrischer Leistungsschalter
BE564461A (de) * 1957-02-01
DE1065060B (de) * 1958-09-05 1959-09-10 Voigt & Haeffner Ag Daempfungspumpe fuer Kraftspeicherantrieb elektrischer Schaltgeraete

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2015792A (en) * 1933-03-31 1935-10-01 John G Flanigan Starting control system for automobile engines
US2025549A (en) * 1934-08-28 1935-12-24 Gen Electric Operating mechanism for electric circuit breakers
US2574334A (en) * 1940-04-06 1951-11-06 Merlin Gerin Air-blast circuit breaker
US2592079A (en) * 1948-07-31 1952-04-08 Bbc Brown Boveri & Cie Compressed gas operated circuit breaker
US2572406A (en) * 1948-09-02 1951-10-23 Stulz Charles High-voltage oil circuit breaker
US2919329A (en) * 1956-07-10 1959-12-29 Merlin Gerin Air blast circuit breakers
US3071670A (en) * 1959-07-01 1963-01-01 Westinghouse Electric Corp Circuit interrupters

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3614357A (en) * 1969-05-08 1971-10-19 Ite Imperial Corp Gas blast circuit interrupter using main movable contact as blast valve
US3629532A (en) * 1970-02-20 1971-12-21 Sun Electric Corp Immediately responsive fluid flow operated switch with normally closed spring contact in flow channel
EP1939908A1 (de) * 2006-12-29 2008-07-02 ABB Technology Ltd Verfahren für den Betrieb eines Schutzschalters
WO2008080979A3 (en) * 2006-12-29 2008-12-04 Abb Technology Ltd High-voltage disconnecting circuit breaker and method of operating the same
US20100012624A1 (en) * 2006-12-29 2010-01-21 Ulf Akesson High-Voltage Disconnecting Circuit Breaker And Method Of Operating The Same
RU2458425C2 (ru) * 2006-12-29 2012-08-10 Абб Текнолоджи Лтд Высоковольтный выключатель с функцией разъединителя и способ управления выключателем

Also Published As

Publication number Publication date
DE1203855B (de) 1965-10-28
CH383467A (de) 1964-10-31
GB924613A (en) 1963-04-24

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