US3359391A - Power circuit breaker with arc quenching means - Google Patents

Power circuit breaker with arc quenching means Download PDF

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Publication number
US3359391A
US3359391A US443784A US44378465A US3359391A US 3359391 A US3359391 A US 3359391A US 443784 A US443784 A US 443784A US 44378465 A US44378465 A US 44378465A US 3359391 A US3359391 A US 3359391A
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US
United States
Prior art keywords
control chamber
reservoir
circuit breaker
piston
chamber
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
US443784A
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English (en)
Inventor
Manz Hans
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.)
Rheinmetall Air Defence AG
Maschinenfabrik Oerlikon AG
Original Assignee
Werkzeugmaschinenfabrik Oerlikon Buhrle AG
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 Werkzeugmaschinenfabrik Oerlikon Buhrle AG filed Critical Werkzeugmaschinenfabrik Oerlikon Buhrle AG
Application granted granted Critical
Publication of US3359391A publication Critical patent/US3359391A/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
    • H01H33/72—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
    • 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
    • H01H33/92—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 liquid, e.g. oil

Definitions

  • a power circuit breaker is disclosed as including stationary and movable contacts and an arc-control chamber containing a turbulator stack.
  • a piston is fixed to the movable contact and is movable within a pump cylinder, this piston dividing the cylinder into a first compartment beneath the piston and a second compartment above the piston.
  • a reservoir of quenching liquid communicates with the first compartment and is communicable with the arc-control chamber through a non-return valve.
  • a liquid supply chamber containing the arc quenching liquid is communicable with the reservoir through a nonreturn valve, and a return path for quenching liquid extends between the arc-control chamber and the liquid supply chamber.
  • quenching liquid is drawn from the supply chamber to the reservoir and the first compartment beneath the piston and, during separation of the breaker contacts, quenching liquid is forced out of the reservoir into the arc-control chamber and through the liquid return path back to the supply chamber.
  • This invention relates to power circuit breakers of the type having an arc control chamber into which are quenching liquid is injected and, more particularly, to a novel power circuit breaker of this type including novel means injecting a fresh supply of arc quenching liquid into the arc control chamber in each operation of the circuit breaker.
  • An object of the present invention is to provide a power circuit breaker of the type having an arc control chamber into which quenching liquid is injected by means 3,359,391 Patented Dec. 19, 1967 of a pump piston, during opening of the breaker contacts, and in which a fresh supply of quenching liquid is injected into the arc control chamber during each operation cycle of the circuit breaker contacts.
  • Another object of the invention is to provide a power circuit breaker of the type having an arc control chamber into which arc quenching liquid is injected, during opening of the breaker contacts, by means of a pump piston coupled to the movable breaker contact, and in which the pump piston is associated with a reservoir into which quenching liquid is drawn from a supply chamber during closing of the breaker contacts and quenching liquid is returned to the supply chamber during opening of the breaker contacts and through the arc control chamber and a return passage connected to the supply chamber.
  • a further object of the invention is to provide a power circuit breaker of the mentioned type having means, including a pump connected between a reservoir and the arc control chamber and having a liquid displacing element coupled to the movable contact for movement therewith, this means being operable, during closing movement of the movable contact, to force liquid under pressure into the control chamber and to draw liquid from the supply chamber into the reservoir.
  • Yet another object of the invention is to provide a power circuit breaker of the type just mentioned, in which said means is operable, during opening movement of the movable contact, to force liquid from the reservoir into the control chamber and from the control chamber through a liquid return passage into the supply chamber.
  • Still another object of the invention is to provide a power circuit breaker of the type mentioned including spring loaded valves interposed between the control chamber and the supply chamber, these valves being normally open and being designed to close when the liquid pressure within the control chamber exceeds a preselected value.
  • Still another object of the invention is to provide a power circuit breaker of the type mentioned including novel means for protecting the insulator of the circuit breaker from excessive loads.
  • a further object of the invention is to provide a power circuit breaker of the type mentioned, in which, if the pressure in the arc control chamber increases to such an extent such that the valve connecting the reservoir to the arc control chamber cannot open, the liquid within the arc control chamber may escape through a clearance between a pump piston and its cylinder and thereby blocking of contact opening movement of the movable contact is prevented.
  • FIG. 1 is a longitudinal sectional View of a circuit breaker embodying the invention, with the contacts being shown in their open position;
  • FIG. 2 is a longitudinal sectional view of the circuit breaker shown in FIG. 1, and in a plane at a small angle to the plane of the longitudinal section of FIG. 1, the contacts in FIG. 2 being illustrated during their closing movement; and
  • FIG. 3 is a somewhat schematic and enlarged perspective view of the circuit breaker shown in FIGS. 1 and 2.
  • a circuit breaker embodying the invention includes a lower compartment 1, constituting an arc quenching liquid supply chamber which surmounts a supporting pedestal which is not shown in the drawings.
  • Compartment 1 also houses a contact driving cylinder 2 in which there is movable a piston 2a for operating the circuit breaker contacts.
  • the circuit breaker mechanism proper comprises essentially an arc control chamber 3 containing a turbulator stack 4, a relatively fixed contact 5, and a movable contact or pin 6. The latter is actuated by the piston 2a in the driving cylinder 2.
  • Movable contact or pin 6 forms the piston rod of a piston 7, which is slida-ble in a pump cylinder 8, and whose peripheral surface has a relatively small annular clearance 9 with the inner surface of the cylinder wall.
  • Piston 7 is fixedly connected to contact driving piston 2a,
  • An insulator 10 surmounted by a cowl 11 and a cover 12, surrounds arc control chamber 3 and is separated therefrom by an annular space 13.
  • the lower end of annular space 13 is connected to are quenching fluid supply chamber 1 by a duct, or liquid return passage, 14. Compartment 1 and space 13 are filled with the arc quenching liquid.
  • the upper end of annular space 13 is connected to the space within cowl 11, and thus to are control chamber 3, through the medium of normally open spring loaded valves 15 and 16.
  • a reservoir 17 is operatively associated with cylinder 8 extending longitudinally of the latter.
  • Reservoir 17 is in communication with the lower portion of cylinder 8, through an opening or port 18, is in communication with are quenching liquid supply chamber 1 through a valve 19, and is in communication with arc control chamber 3 through a valve 20.
  • a pipe or duct 21 extends longitudinally of reservoir 17 and provides a connection between the upper end of cylinder 8, through the medium of an opening or port 22, and the supply chamber 1.
  • the circuit breaker operates in the following manner:
  • chamber or compartment 1 and annular space 13 are filled with arc quenching liquid.
  • piston 7 moves upwardly in cylinder 8 and draws arc quenching liquid from supply chamber 1, through valve 19, reservoir 17, and opening 18, into cylinder 8 behind or beneath piston 7.
  • the liquid above or ahead the piston is forced under pressure through opening 22 and, through pipe or duct 21, into supply chamber 1.
  • valves 15 and 16 are spring loaded, and these valves are arranged to close when the liquid pres sure within cowl 11 and are control chamber 3 exceeds a preselected value. Thus, should a short circuit current occur, resulting in the evolution of an excessive quantity of gas, the increased pressure will close valves 15 and 16, thus disconnecting space 13 from cowl 11. Insulator 10 is thus protected from excessive loads.
  • liquid drawn into reservoir 17 from supply chamber 1 during closing of the breaker contacts will be stored in reservoir 17 and injected into arc control chamber 3 during subsequent opening of contacts 5 and 6.
  • the quenching liquid is circulated and the same liquid is never used in arc control chamber 3 for consecutive operations of the circuit breaker.
  • a very high current such as a short circuit current
  • the pressure in arc control chamber 3 may rise to such an extent that valve 20 is prevented from reliably opening.
  • part of the liquid can escape through the clearance 9 during downward movement of piston 7, and thus prevent blocking of the downward movement of the piston and opening of the contacts.
  • a power circuit breaker as claimed in claim 1, including a port connecting said first cylinder compartment to said reservoir.
  • a power circuit breaker as claimed in claim 1, including a duct connecting said second cylinder compartment to said supply chamber and extending through said reservoir.
  • a power circuit breaker as claimed in claim 1, in which there is an annular clearance between said piston and the inner circumferential surface of said pump cylinder. 7
  • a power circuit breaker asclaimed in claim 1, in which said are control chamber is disposed within an insulator; the exterior lateral surface of said are con- References Cited trol chamber and the interior lateral surface of said UNITED STATES PATENTS insulator defining an annular space constituting said liquid 2,909,633 10/1959 Umphery 200 150 return path.
  • a power circuit breaker as claimed in claim 5, 5 FOREIGN PATENTS including pressure responsive valve means connecting said 1159538 2/1958 France 1,330,551 5/1963 France. annular space to said arc control chamber, said pressure 1,131,300 6/1962 Germany. responsive valve means closlng when the pressure m said arc control chamber exceeds a predetermined value. 10 ROBERT S. MACON, Primary Examiner.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Circuit Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US443784A 1964-09-09 1965-03-30 Power circuit breaker with arc quenching means Expired - Lifetime US3359391A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1179364A CH413049A (de) 1964-09-09 1964-09-09 Flüssigkeitsarmer Leistungsschalter

Publications (1)

Publication Number Publication Date
US3359391A true US3359391A (en) 1967-12-19

Family

ID=4376914

Family Applications (1)

Application Number Title Priority Date Filing Date
US443784A Expired - Lifetime US3359391A (en) 1964-09-09 1965-03-30 Power circuit breaker with arc quenching means

Country Status (5)

Country Link
US (1) US3359391A (de)
CH (1) CH413049A (de)
DE (1) DE1490048C2 (de)
GB (1) GB1038326A (de)
NL (1) NL146635B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3555279A (en) * 1967-03-17 1971-01-12 Masch Fabrik Oerlikon Oil circuit breaker with quench chamber connected to the high pressure side of a fluid pump

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1159538A (fr) * 1955-11-17 1958-06-27 Siemens Ag Interrupteur à expansion
US2909633A (en) * 1957-02-11 1959-10-20 Donald M Umphrey High tension oil switch
DE1131300B (de) * 1956-02-24 1962-06-14 Bruno Paul Jean Cirilli Fluessigkeitsarmer Hochspannungs-leistungsschalter
FR1330551A (fr) * 1961-08-04 1963-06-21 Ass Elect Ind Perfectionnements apportés aux disjoncteurs à faible volume d'huile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1159538A (fr) * 1955-11-17 1958-06-27 Siemens Ag Interrupteur à expansion
DE1131300B (de) * 1956-02-24 1962-06-14 Bruno Paul Jean Cirilli Fluessigkeitsarmer Hochspannungs-leistungsschalter
US2909633A (en) * 1957-02-11 1959-10-20 Donald M Umphrey High tension oil switch
FR1330551A (fr) * 1961-08-04 1963-06-21 Ass Elect Ind Perfectionnements apportés aux disjoncteurs à faible volume d'huile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3555279A (en) * 1967-03-17 1971-01-12 Masch Fabrik Oerlikon Oil circuit breaker with quench chamber connected to the high pressure side of a fluid pump

Also Published As

Publication number Publication date
NL146635B (nl) 1975-07-15
NL6411988A (de) 1966-03-10
CH413049A (de) 1966-05-15
DE1490048B2 (de) 1972-12-21
DE1490048A1 (de) 1969-05-22
DE1490048C2 (de) 1981-07-30
GB1038326A (en) 1966-08-10

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