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US3602670A - Breaking chamber for self-blasting compressed gas electric circuit breakers - Google Patents

Breaking chamber for self-blasting compressed gas electric circuit breakers Download PDF

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Publication number
US3602670A
US3602670A US25144A US3602670DA US3602670A US 3602670 A US3602670 A US 3602670A US 25144 A US25144 A US 25144A US 3602670D A US3602670D A US 3602670DA US 3602670 A US3602670 A US 3602670A
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US
United States
Prior art keywords
recesses
chamber
projections
cylindrical member
movable contact
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
US25144A
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English (en)
Inventor
Benito Jose Calvino Y Teijeiro
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.)
Magnano MSM SpA
Original Assignee
Magnano MSM SpA
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 Magnano MSM SpA filed Critical Magnano MSM SpA
Application granted granted Critical
Publication of US3602670A publication Critical patent/US3602670A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas

Definitions

  • the present invention relates to an improvement in the quenching means of the breaking chambers for self-blasting compressed gas circuit breakers, which improvement adapts said breakers for improved breading capacity especially when very high currents are involved.
  • self-blasting compressed gas circuit breakers generally include a fixed contact and a moving contact preferably of a tulip shape.
  • the moving contact is fixedly connectedto the bottom of a cylindrical member containing compressed gas and to an orifice structure or nozzle wherein the arc quenching takes place as a consequence of the axial gas blast proceeding from said cylindrical chamber.
  • This cylindrical member is mounted to slide axially on a fixed piston thereby varying the volume' of the chamber therein.
  • the operational principle of the circuit breakers lies, as is known, in the quick are breaking carried out by a gas blast generated by the relative displacement of the contacts themselves. Such arc breaking becomes more effective and quicker as the axial gas blast becomes more rapid, i.e. the more limited are the whirling motions of the gas in the passages leading from the chamber to the nozzle. These whirling motions or eddy currents that have always developed in the known circuit breakers are undesirable since they result in losses of gas flow which can often be of appreciable importance.
  • Another object of the present invention is to provide an improved compressed gas chamber having higher duty capacities without altering the circuit breaker characteristics, which are necessary for a correct operation when very high currents are to be broken.
  • a compressed gas chamber for a self-blasting compressed gas electric circuit breaker having the moving contact fixed to the bottom of a cylindrical member having a chamber filled with the quenching compressed gas and which is slidably mounted on a piston fixed to a support base.
  • the compressed gas chamber according to the present invention is provided with a plurality of openings or recesses formed in one end of the cylindrical member.
  • the openings or recesses preferably have substantially the shape of a truncated cone with the wide base thereof directed inwardly towards the chamber.
  • a corresponding plurality of projections are provided on the upper surface of the fixed piston and are shaped complementary to the recesses.
  • the projections upon opening of the circuit breaker contacts, extend into the respective recesses and reduce the residual volume thereof to the minimum at the end of the opening stroke of the contacts.
  • the substantially truncated coneshaped recesses are in direct communication with a cylindrical cavity formed between the known orifice structure of the arc suppression nozzle and the fingers of the tulip-shaped movable contact.
  • the improvements of the present invention more particularly allow for an increase in the compression ratio of the circuit breaker, namely, an increase in the ratio between the maximum volume of the gas-containing cylinder (the dead spaces as far as the cross section of the proper nozzle included) and the corresponding residual minimum volume at the end position of the opening stroke of the circuit breaker.
  • FIG. 1 is a schematic longitudinal section of a portion of a self-blasting circuit breaker with the contacts closed;
  • FIG. 2 is a schematic longitudinal section, similar to FIG. 1, with the contacts in the open position;
  • FIG. 3 is a schematic transverse cross section taken along line 33 of FIG. 1 and showing the bottom of the cylindrical member.
  • the circuit breaker ofthe present invention comprises a compressed gas circuit breaker having a fixed contact 1 and a movable contact 2, which is of the type having a tulip shape and is connected to the bottom of a hollow cylindrical member 3.
  • a chamber 3' is formed within the member and contains the compressed gas.
  • the member 3 is driven by a control rod 5 to axially slide on a piston-shaped body 6.
  • An arc suppression nozzle 4 (or like orificed structure) is connected to the upper end of the cylindrical member in communication with the chamber.
  • the inventive circuit breaker is adapted to remarkably improve the performance of a gas-blast circuit breaker in its ability to interrupt very high currents. This is accomplished by forming a plurality of recesses 7, which are preferably at least four in number and are uniformly and evenly spaced on the closed end of the cylindrical member 3. These recesses are preferably substantially shaped in the form of truncated cones having a wide base directed toward the chamber 3'.
  • the recesses 7 are actually sections of a slanted cone-shaped body having a cone generatrix', which is perpendicular to the base plane, coaxial with the body formed by the fingers of movable contact 2.
  • the present invention also provides a plurality of projections 8, shaped complementary to the recesses 7 and being of a like number, protruding from the head of the fixed piston 6. These projections are of such shape and dimensions that when the circuit breaker contacts are open, as shown in FIG. 2, the projections almost completely fill the recesses. Thus, the insertion of the projections into the recesses reduces the volume of the recesses to a minimum.
  • the recesses are preferably four in number and their bases have the shape of a circular sector with the widest possible area compatible with the end of the member 3.-
  • a self-blasting compressed gas electric circuit breaker comprising a fixed contact, a tulip-shaped movable contact, an orificed member surrounding said movable contact, a cylindrical member having therein a compressed gas chamber, a fixed piston, said cylindrical member being axially slidably mounted on said fixed piston, a plurality of recesses formed in one end of the cylindrical chamber, and a like plurality of projections fixed to said piston and directed towards said recesses, said projections and recesses having complementary shapes, said projections being received in said recesses to reduce the residual volume thereof to an absolute minimum at the end of the opening stroke of said contacts, said recesses providing direct communication between the chamber and the orificed structure around the fingers of the tulip-shaped movable contact.
  • An electric circuit breaker according to claim 1 in which the base section of said recesses is circular-shaped and the sum of said base sections is as high as possible and yet compatible with the inner dimensions of the chamber wherein said gas is contained.
  • a self-blasting compressed gas circuit breaker comprising a fixed contact, a tulip-shaped movable contact, a hollow cylindrical member fixedly connected to and movable with said movable contact, an orifice member extending from said cylindrical member past said movable contact to enclose said contacts in the contacts closed position, a fixed piston, said cylindrical member being axially movably mounted on said fixed piston forming a chamber therebetween, a plurality of recesses formed in said cylindrical member at the end opposite said fixed piston, said recesses providing direct communication between said chamber and said orifice member, a like plurality of projections formed on said piston and directed toward said recesses, said projections being complementary in shape to said recesses and extending therein, in a contact open position, to substantially fill the entire volume thereof whereby swirling of the gas in said chamber is reduced to a minimum upon opening of said contacts.

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  • Circuit Breakers (AREA)
  • Catching Or Destruction (AREA)
US25144A 1969-04-03 1970-04-02 Breaking chamber for self-blasting compressed gas electric circuit breakers Expired - Lifetime US3602670A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1503669 1969-04-03

Publications (1)

Publication Number Publication Date
US3602670A true US3602670A (en) 1971-08-31

Family

ID=11146205

Family Applications (1)

Application Number Title Priority Date Filing Date
US25144A Expired - Lifetime US3602670A (en) 1969-04-03 1970-04-02 Breaking chamber for self-blasting compressed gas electric circuit breakers

Country Status (9)

Country Link
US (1) US3602670A (ja)
JP (1) JPS505378B1 (ja)
BE (1) BE766453Q (ja)
BR (1) BR7018011D0 (ja)
DE (1) DE2015473B2 (ja)
FR (1) FR2042842A5 (ja)
GB (1) GB1310906A (ja)
NO (1) NO128085B (ja)
SE (1) SE360947B (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048456A (en) * 1976-04-01 1977-09-13 General Electric Company Puffer-type gas-blast circuit breaker
US4387280A (en) * 1978-05-29 1983-06-07 General Electric Company High speed hydraulically-actuated operating system for an electric circuit breaker
US9035211B2 (en) 2011-07-20 2015-05-19 Pennsylvania Breaker, Llc Gas blast interrupter

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS524067A (en) * 1975-05-30 1977-01-12 Mitsubishi Electric Corp Gas breaker
NL7607487A (nl) * 1975-08-07 1977-02-09 Westinghouse Electric Corp Drukgasschakelaar van het blaastype.
YU218778A (en) * 1978-09-15 1982-06-30 Sour Energoinvest Ro Istraziv High-voltage interruption element of a pushing type with an improved and simplified system of arc contact and nozzle
DE3041801C2 (de) * 1980-11-06 1986-11-06 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Autopneumatischer Druckgasschalter
DE3127678A1 (de) * 1981-07-14 1983-02-10 BBC Aktiengesellschaft Brown, Boveri & Cie., 5401 Baden, Aargau Hochspannungs-leistungsschalter
DE3430306C2 (de) * 1984-08-15 1987-03-12 Ernst Prof. Dr.techn.habil. 1000 Berlin Slamecka Elektrischer Druckgasleistungssschalter
DE3822410C1 (en) * 1988-07-01 1989-10-26 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De Sulphur hexa:fluoride compressed gas switch - has thread between nozzle and cylinder to better withstand force and temp. loading without enlargement of actual mass of nozzle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048456A (en) * 1976-04-01 1977-09-13 General Electric Company Puffer-type gas-blast circuit breaker
US4387280A (en) * 1978-05-29 1983-06-07 General Electric Company High speed hydraulically-actuated operating system for an electric circuit breaker
US9035211B2 (en) 2011-07-20 2015-05-19 Pennsylvania Breaker, Llc Gas blast interrupter

Also Published As

Publication number Publication date
DE2015473A1 (de) 1970-10-08
BE766453Q (fr) 1971-09-16
BR7018011D0 (pt) 1973-01-16
GB1310906A (en) 1973-03-21
SE360947B (ja) 1973-10-08
FR2042842A5 (ja) 1971-02-12
NO128085B (ja) 1973-09-24
JPS505378B1 (ja) 1975-03-03
DE2015473B2 (de) 1979-03-08

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