US2382703A - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
US2382703A
US2382703A US460231A US46023142A US2382703A US 2382703 A US2382703 A US 2382703A US 460231 A US460231 A US 460231A US 46023142 A US46023142 A US 46023142A US 2382703 A US2382703 A US 2382703A
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US
United States
Prior art keywords
arc
chamber
cylinder
extinguishing chamber
extinguishing
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
US460231A
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English (en)
Inventor
Estienne Aime
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Individual
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Individual
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Publication date
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Publication of US2382703A publication Critical patent/US2382703A/en
Anticipated expiration legal-status Critical
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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
    • H01H33/72—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber
    • H01H33/75—Liquid-break switches, e.g. oil-break

Definitions

  • One object of the present invention is to reduce the stresses which the supporting insulators of circuit-breakers of small oil-volume are subjected to. Its aim is a circuit-breaker of this type chiefly characterized by devices which allow part of the liquid mass contained in the extinguishing chamber to move towards the insulators supporting the chamber when the breaking of the circuit occurs and before said mass escapes from said chamber under the action of gases formed by the extinction of the arc.
  • Fig. 1 shows a longitudinal section of an electric circuit-breaker embodying one illustrative form of the present invention, the extinguishing chamber of which is movable relatively to its insulating support;
  • Fig. 2 is a cross-section on lin 2-2 of Fig. 1;
  • Fig. 3 is a graph of th general form taken by the stresses caused by the displacement of the oil piston
  • Fig. 4 is a graph of the general motion imparted to the extinguishing chamber
  • Fig. 5 is a longitudinal section of another i11ustrative embodiment of the invention.
  • Fig. 6 is a longitudinal section of a further illustrative embodiment of the invention.
  • a supporting insulator supports a porcelain cylinder I3 inside which is mounted an extinguishing chamber preferably of Bakelite.
  • the latter is filled with oil and contains an extinguishing pot I2 fixed in chamber 2 and traversed by the movable contact of the arcdrawing means in the arc-drawing operation.
  • This chamber is supported by a spring 3 resting on the insulator l and the strength of which has been so chosen that it balances the weight of said chamber 2 and allows the latter, when it undergoes internal pressures produced by the rupturing arc, to move a few centimeters coaxially of the insulator l and the external cylinder [3.
  • Guiding means is provided in order to guide said displacement, said means herein illustratively comprising guiding bosses l5 and I6 spaced circularly inside cylinder [3 adjacent its top and bottom.
  • the space between cylinder 13 and chamber 2 is filled with oil and ports 20 of very small diameter provided in the lower part of the wall of chamber 2 balance the oil level in chamber 2 and in the external cylinder l3 without any quick pressure waves produced by the electric arc being transmitted to the said cylinder.
  • the arc-drawing means comprises a fixed contact 8 at the bottom of the extinguishing chamh r 2 under the extinguishing chamber I2, and a movable circuit breaker contact consisting of a rod 9 driven by a two armed lever in.
  • the circuit breaker contacts are shown in open circuit position; in order to close the circuit, lever I0 is turned in the direction of the arrow by any suitable, conventional mechanism (not shown).
  • chamber 2 On breaking the circuit, chamber 2, under the action of stress F1, undergoes at first a downward displacement, compressing spring 3; the stress transmitted to insulator l corresponds only to the spring compressing stress.
  • Fig. 5 represents another illustrative embodito do away with spring 3.
  • Fig. 6 shows another embodiment which makes it p ssible to reduce to a minimum the stress transmitted to the supportin insulator I, to maintain the-optima conditions of extinction and
  • the extinguishing chamber is provided at its lower portion with an airtight float 28 which raises said chamber slightly above the oil level.
  • an airtight float 28 which raises said chamber slightly above the oil level.
  • Said chamber may be guided in its movement in any suitable manner, for example'as 1in the embodiment of Figv -1; but this embodiment of Fig.6 requires two independentoil levels, one for the external cylinder l3 and the other for the extinguishing chamber 2.
  • the driving elements of the movable contact are mounted on the upper part of the supporting insulator I.
  • the stroke of the movable contact-rod 9 being predetermined, and
  • an electric circuit breaker the combination of an exterior cylinder; an arc-extinguishin chamber within said cylinder, closed at both ends and having its lateral walls spaced from those of said cylinder, said cylinder and said arc-extinguishing chamber containing oil; arc-drawing means comprising a fixed contactmounted in said arc-extinguishing chamber and a cooperating movable contact having a sliding fit in an end wall of said arc-extinguishing chamber; suitableports in the wall of said arc-extinguishing chamber, for equalizing the oil levels in said cylinder and in said arc-extinguishing chamber,
  • an electric circuit breaker the combination of an exterior cylinder; an insulator supan arc-extinguishing chamber within said cylinder, closed at both ends and having its lateral walls spaced from those of said cylindensaid cylinder and said arc-extinguishing chamber containing oil; arc-drawing means comprising a fixed contact mounted in said arc-extinguishing chamber and a cooperating movable contact having a sliding fit in the top end wall of said arc-extinguishing chamber; suitable ports in the wall of said arc-extinguishing chamber, for equalizing the oil levels in said cylinder and in said arc-extinguishing chamber,
  • an electric circuit breaker the combination of an exterior cylinder; an arc-extinguishing chamber within said cylinder closed at both ends and having its lateral walls spaced from those of said cylinder, said cylinder and said areextinguishing chamber containing oil; arcdrawing means comprising a fixed contact mounted in said arc-extinguishing chamber and a cooperating movable contact having a sliding fit in an end wall of said arc-extinguishing cham ber; suitable ports inthe wall of said arc-extinguishing chamber, for equalizing the oil levels in said cylinder and in said arc-extinguishing chamber, thus to avoid transmission of pressure waves to said cylinder upon rupture of the arc; an air chamber mounted in said arc-extinguishingchamber, said air chamber having relatively large ports communicating with the interior of said arc-extinguishing chamber, said air chamber containing 011 and an air cushion above the surface of the latter; and an airspace above the oil column in said arc-extinguishing chamber
  • an electric circuit breaker the combination of an exterior cylinder; an arc-extinguishing chamber within said cylinder closed at both ends and having its lateral walls spaced from those of aid cylinder, said cylinder and said arc-extinguishing chamber containing oil; arcdrawing means comprising a fixed contact mounted in said arc-extinguishing chamber and a cooperating movable contact having a sliding fit in an end wall of said arc-extinguishing chamber; a sealed air chamber acting as a float for supporting said arc-extinguishing chamber in the oil in said cylinder, whereby said arc-extinguishing chamber is adapted to move axially of aid cylinder, thus to reduce the stresses exerted upon the structure upon rupture of the are.
  • an electric circuit breaker the combination of an exterior cylinder; an arc-extinguishing chamber within said cylinder, closed at both ends and having its lateral Walls spaced from those of said cylinder, said cylinder and said areextinguishing chamber containing oil; arc-drawing means comprising a fixed contact mounted in said arc-extinguishing chamber and a cooperating movable contact having a sliding fit in an end ment axially of the latter-and thus to reduce the stresses exerted upon the structure upon rupture of the arc.
  • an electric circuit breaker the combination of an exterior cylinder; an arc-extinguishing chamber within said cylinder, closed at both ends and having its lateral walls spaced from those of wall of said arc-extinguishing chamber; an arcextinguishing pot mounted in said chamber and traversed by said movable contact in the arcdrawing operation; suitable ports in the wall of said arc-extinguishing chamber, for equalizing the oil levels in said cylinder and in said arcextinguishing chamber, thus to avoid transmission of pressure waves to said cylinder upon rupture of the arc; an air chamber mounted in said arc-extinguishing chamber, said air chamber having relatively large ports communicating with the interior of said arc-extinguishing chamber, said air chamber containing oil and an air cushion above the surface of the latter whereby yieldingly to support the oil column insaid arc-extinguishing chamber and thus to reduce the stresses exerted upon the structure upon rupture of the arc.
  • an electric circuit breaker the combination of an exterior cylinder; an arc-extinguishing chamber Within said cylinder closed at both ends and having its lateral Walls spaced from those of said cylinder, said cylinder and said arc-extinguishing chamber containing oil; arc-drawing means comprising a fixed contact mounted in said arc-extinguishing chamber and a cooperatin: movable contact having a sliding fit in an end wall of said arc-extinguishing chamber; an arc-extinguishing pot mounted in said chamber and traversed by said movable contact in the arcdrawing operation; suitable ports in the wall of said arc-extinguishing chamber, for equalizing the oil levels in said cylinder and in said arcextinguishing chamber, thus to avoid transmission of pressure Waves to said cylinder upon rupture of the arc; an air chamber mounted.
  • said air chamber having relatively large ports communicating with the interior of said arc-extinguishing chamber, said air chamber containing oil and an air cushion above the surface of the latter; and an air space above the oil column in said arc-extinguishing chamber; whereby yieldingly to support the oil column in said arc-extinguishing chamber and thus to reduce the stresses exerted upon the structure upon rupture of the arc.
  • a substantially closed container forming an arc-extinguishing chamber, a pair of separable contacts enclosed in said chamber, said chamber containin arcextinguishing liquid in which said contacts are immersed, one of said contacts being fixed in said chamber and the other contact being slidably mounted in said chamber through an aperture formed in the wall of said chamber, a second container surrounding the first mentioned container and having portions spaced therefrom, the space between said first and second containers being partly filled with a liquid, said first and second containers having communication with each other whereby the pressure Waves generated in the liquid within the first container upon rupture of the are are absorbed, by the resultant change in the level of the liquid in said second container so that no dangerous stresses are exerted on the structure of said circuit breaker upon rupture, of the arc.

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  • Circuit Breakers (AREA)
US460231A 1941-06-18 1942-09-30 Circuit breaker Expired - Lifetime US2382703A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR876970T 1941-06-18

Publications (1)

Publication Number Publication Date
US2382703A true US2382703A (en) 1945-08-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
US460231A Expired - Lifetime US2382703A (en) 1941-06-18 1942-09-30 Circuit breaker

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US (1) US2382703A (en(2012))
BE (1) BE445992A (en(2012))
CH (1) CH229043A (en(2012))
FR (1) FR876970A (en(2012))
NL (1) NL59646C (en(2012))

Also Published As

Publication number Publication date
NL59646C (en(2012))
BE445992A (en(2012))
FR876970A (fr) 1942-11-24
CH229043A (fr) 1943-09-30

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