US3238340A - Gas-blast circuit breaker - Google Patents

Gas-blast circuit breaker Download PDF

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Publication number
US3238340A
US3238340A US217164A US21716462A US3238340A US 3238340 A US3238340 A US 3238340A US 217164 A US217164 A US 217164A US 21716462 A US21716462 A US 21716462A US 3238340 A US3238340 A US 3238340A
Authority
US
United States
Prior art keywords
gas
blast
piston
circuit breaker
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
US217164A
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English (en)
Inventor
Lerch Hans Werner
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.)
Rockwell Automation Switzerland GmbH
Original Assignee
Sprecher und Schuh 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 Sprecher und Schuh AG filed Critical Sprecher und Schuh AG
Application granted granted Critical
Publication of US3238340A publication Critical patent/US3238340A/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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H33/121—Load break switches
    • H01H33/122—Load break switches both breaker and sectionaliser being enclosed, e.g. in SF6-filled container
    • 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
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7069—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by special dielectric or insulating properties or by special electric or magnetic field control properties
    • 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
    • H01H33/882—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 the movement being assisted by accelerating coils

Definitions

  • Breakers using an electro-negative gas as extinguishing duid require a closed gas circuit; the gas used for blowing has to be recovered in specially formed breaker parts or casings for repeated use. Therefore it is advantageous to provide compact blast devices which can be disposed as completely as possible within the breaker casing. Moreover, the substantially improved. extinguishing characteristics of the electro-negative gas as compa-red with air enable even in the case of high circuit breaking capacity, to avoid the use of compressors and to operate with the blast energy which can be produced by the switching operation itself.
  • the prior devices for selfblasting have the following, fundamental disadvantages.
  • the gas to be used for the blast is already ionized and. can be used for relatively small circuit breaking capacities only.
  • FIG. l is a diagrammatic section of the fundamental structure of the arc extinguishing device of the compressed gas circuit breaker shown in closed-circuit condition;
  • FIG. 2 represents the device of FIG. l in oit position
  • FIG. 3 is a simplified section of a compressed gas circuit breaker having relieving contacts connected in parallel with the arc extinguishing device.
  • FIGS. l and 2, 1 designates the stationary contact and 2 the movable contact of the circuit 3,238,340: Patented Mar. 1, 1966 breaker.
  • the movable contact 2 and the surrounding blast nozzle 3 are rigidly connected with a piston 4 having a passageway 5 therethrough.
  • the piston is movable in a cylinder 6 and ⁇ can be locked in its raised position, corresponding to the closed circuit condition by a pawl 9.
  • the cylinder 6 is filled with an electro-negative gas and is influenced by a tension spring 7 made of an electrically conductive material and positioned between the piston 4 and a terminal 8 fixed to the cylinder bottom.
  • the described device accordingly allows to considerably increase the switching-off capacity when excess currents occur.
  • the extinguishing flow is dependent on the current in that the blast effect is smaller in the case of small currents whereby the breaking of small currents is avoided, which often leads to considerable excess voltages in gas-blast switches.
  • FIG. 3 shows a practical embodiment of a switch constructed in accordance with the described principle of extinction.
  • the outer driving and releasing mechanism and the insulation against ground are not shown and the switch is represented in its closed-circuit condition.
  • the proper breaking mechanism again consists of members 1 to 7 and is fundamentally constructed in the same manner as shown in FIGS. 1 and 2.
  • a blade spring 18 provides the necessary contact pressure between the tixed and movable contacts 1 and 2.
  • a disconnector comprising a stationary upper contact 10, a movable contact stud 11 and a sliding contact 12 is mounted parallel with the circuit breaker.
  • a check valve 13 is arranged in the bottom of the cylinder 6.
  • the piston 4 and the contact 2 of the breaker, as well as the contact stud 11 of the parallel disconnector, are operated by an actuating mechanism including a lever 14 having one end. thereof connected to the contact stud 11 by an articulated link 15.
  • the lever 14 is journalled on a pin 24 on which is rotatably mounted a cam 16.
  • a cam follower rod 17 is connected to the piston 4 and is applied against the periphery of the cams by the tension of the spring 7 acting on the piston.
  • the lever 14 can effect a limited angular movement relatively to the cam 16 between the two stop pins 25 and 26 carried by the cam.
  • the entire breaking mechanism is disposed in a gas-tight container, the middle part 6 of which consists of insulating material, while the cap 19 and the bottom portion 20 may be metallic.
  • the upper contacts 1 and 10 are connected electrically to each other and to the terminal 21.
  • the sliding contact 12 and the current carrying spring 7 are electrically connected to the lower terminal 8.
  • the entire container 6, 19 and 20 is llled with an electro-negative gas, such as sulfohexafluoride SP6, which preferably is under pressure.
  • the current leading parts of the switch are dimensioned in conventional manner so that in the closed-circuit condition the major portion of the current flows over the parallel disconnector 10, 11, 12, while the current path of the breaker 1, 2, 7, 8 is only temporarily traversed by the total cur-rent, namely during the switching-Gif procedure.
  • the right hand end of the lever 14 is turned upwardly, i.e. in counterclockwise direction, whereby the contact stud 11 is pulled out of the fixed contact 1@ by the link 15.
  • the cam 16 pivotable on shaft 24 is also turned in counterclockwise direction.
  • the cam follower rod 17 connected to the piston 4 is then released and the piston 4 with the contact 2 moves downwardly under the influence of the spring 7.
  • a gas-blast circuit breaker comprising a pair of separable abutting arcing contacts, a blast nozzle surrounding the movable contact, means for separating said contacts to provide a gap therebetween, means for producing an arc extinguishing gas-blast through said nozzle, said gas-blast producing means including a gas filled chamber, a piston movable in said chamber, said movable Contact and the surrounding blast nozzle being rigidly secured to said4 piston, said piston having a passageway for establishing communication between said gas-filled chamber and the blast nozzle, a coil spring of electrically conductive material operatively connected with said piston and traversed by the current to be interrupted, said.
  • coil spring being a tension spring having an initial tension when the circuit breaker is in its closed condition, a retractable stop means, said piston being held in abutment on said stop means by the tension spring when the circuit breaker is in its closed condition, said tension spring acting on said piston when the contacts are separated and an arc-extinguishing blast is generated and. also current responsive electrodynamic forces generated in said coil spring acting on said piston, said arc extinguishing blast being generated in response to the current traversing said coil spring.

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  • Circuit Breakers (AREA)
US217164A 1961-08-25 1962-08-15 Gas-blast circuit breaker Expired - Lifetime US3238340A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT653361A AT235384B (de) 1961-08-25 1961-08-25 Druckgasschalter mit stromabhängiger Löschmittelströmung

Publications (1)

Publication Number Publication Date
US3238340A true US3238340A (en) 1966-03-01

Family

ID=3587273

Family Applications (1)

Application Number Title Priority Date Filing Date
US217164A Expired - Lifetime US3238340A (en) 1961-08-25 1962-08-15 Gas-blast circuit breaker

Country Status (4)

Country Link
US (1) US3238340A (de)
AT (1) AT235384B (de)
CH (1) CH398741A (de)
DE (1) DE1151586B (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3418440A (en) * 1965-09-14 1968-12-24 Gen Electric Gas-blast circuit breaker
US3524959A (en) * 1966-09-01 1970-08-18 Westinghouse Electric Corp Fluid-blast circuit interrupter with arc transfer to energize electro-magnetic pumping means
US3524957A (en) * 1966-09-01 1970-08-18 Westinghouse Electric Corp Fluid-blast circuit interrupter with improved electromagnetic driving means and lost motion means
US3524958A (en) * 1966-09-01 1970-08-18 Westinghouse Electric Corp Fluid-blast circuit interrupters having electromagnetic piston-driving means
US3529108A (en) * 1966-09-01 1970-09-15 Westinghouse Electric Corp Nozzle and contact construction for fluid-blast circuit interrupters
US3531608A (en) * 1966-09-29 1970-09-29 Westinghouse Electric Corp Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means including three coils
US3582589A (en) * 1968-01-30 1971-06-01 Westinghouse Electric Corp Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means
US3590188A (en) * 1966-09-01 1971-06-29 Westinghouse Electric Corp Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means
US3621171A (en) * 1968-05-06 1971-11-16 Hitachi Ltd Gas blast circuit breaker with puffer piston having an electrodynamic assist in the form of axially overlapping coils
US3639712A (en) * 1969-08-12 1972-02-01 Merlin Gerin Gas blast circuit interrupter having conducting orifice means
US3745281A (en) * 1970-02-20 1973-07-10 Hitachi Ltd Gas-blast circuit breaker having a floating puffer piston driven by electromagnetic force
US4015095A (en) * 1974-09-17 1977-03-29 Siemens Aktiengesellschaft Contact arrangement for an electric compressed-gas circuit breaker
US20080078668A1 (en) * 2006-09-29 2008-04-03 Areva T & D Sa Actuating the oppositely-moving contacts of an interrupting chamber by a cylindrical cam
US20080083704A1 (en) * 2006-10-09 2008-04-10 Areva T&D Sa Actuating the contacts of an interrupting chamber in opposite directions via an insulating tube

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1190079B (de) * 1963-03-28 1965-04-01 Siemens Ag Elektrischer Schalter
DE1206056B (de) * 1963-09-12 1965-12-02 Siemens Ag Elektrischer Schalter
FR2704685B1 (fr) * 1993-04-27 1995-06-02 Gec Alsthom T & D Sa Disjoncteur à énergie de manÓoeuvre d'ouverture réduite.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1050493A (en) * 1910-03-18 1913-01-14 Edmund O Schweitzer Automatic high-voltage circuit-breaker.
US1827430A (en) * 1929-06-29 1931-10-13 Condit Electrical Mfg Corp Electric switch and contact structure
US1827940A (en) * 1929-06-29 1931-10-20 Condit Electrical Mfg Corp Magnetically engaged contact members for electric switches
US2733316A (en) * 1954-09-14 1956-01-31 browne
US2934619A (en) * 1958-05-12 1960-04-26 Gladys E Freundt Magnetic device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE607466C (de) * 1929-08-13 1935-01-03 Calor Elek Zitaets Akt Ges Schalter mit Lichtbogenloeschung durch Pressluft
DE619806C (de) * 1934-03-09 1935-10-10 Delle Atel Const Electr Elektrischer Schalter mit Lichtbogenloeschung durch Druckluft
DE669150C (de) * 1934-12-15 1938-12-17 Devag Due & Co Elek Zitaetsges Leistungstrennschalter mit Lichtbogenloeschung durch Druckluft

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1050493A (en) * 1910-03-18 1913-01-14 Edmund O Schweitzer Automatic high-voltage circuit-breaker.
US1827430A (en) * 1929-06-29 1931-10-13 Condit Electrical Mfg Corp Electric switch and contact structure
US1827940A (en) * 1929-06-29 1931-10-20 Condit Electrical Mfg Corp Magnetically engaged contact members for electric switches
US2733316A (en) * 1954-09-14 1956-01-31 browne
US2934619A (en) * 1958-05-12 1960-04-26 Gladys E Freundt Magnetic device

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3418440A (en) * 1965-09-14 1968-12-24 Gen Electric Gas-blast circuit breaker
US3524959A (en) * 1966-09-01 1970-08-18 Westinghouse Electric Corp Fluid-blast circuit interrupter with arc transfer to energize electro-magnetic pumping means
US3524957A (en) * 1966-09-01 1970-08-18 Westinghouse Electric Corp Fluid-blast circuit interrupter with improved electromagnetic driving means and lost motion means
US3524958A (en) * 1966-09-01 1970-08-18 Westinghouse Electric Corp Fluid-blast circuit interrupters having electromagnetic piston-driving means
US3529108A (en) * 1966-09-01 1970-09-15 Westinghouse Electric Corp Nozzle and contact construction for fluid-blast circuit interrupters
US3590188A (en) * 1966-09-01 1971-06-29 Westinghouse Electric Corp Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means
US3531608A (en) * 1966-09-29 1970-09-29 Westinghouse Electric Corp Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means including three coils
US3582589A (en) * 1968-01-30 1971-06-01 Westinghouse Electric Corp Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means
US3621171A (en) * 1968-05-06 1971-11-16 Hitachi Ltd Gas blast circuit breaker with puffer piston having an electrodynamic assist in the form of axially overlapping coils
US3639712A (en) * 1969-08-12 1972-02-01 Merlin Gerin Gas blast circuit interrupter having conducting orifice means
US3745281A (en) * 1970-02-20 1973-07-10 Hitachi Ltd Gas-blast circuit breaker having a floating puffer piston driven by electromagnetic force
US4015095A (en) * 1974-09-17 1977-03-29 Siemens Aktiengesellschaft Contact arrangement for an electric compressed-gas circuit breaker
US20080078668A1 (en) * 2006-09-29 2008-04-03 Areva T & D Sa Actuating the oppositely-moving contacts of an interrupting chamber by a cylindrical cam
US7777149B2 (en) 2006-09-29 2010-08-17 Areva T&D Sa Actuating the oppositely-moving contacts of an interrupting chamber by a cylindrical cam
US20080083704A1 (en) * 2006-10-09 2008-04-10 Areva T&D Sa Actuating the contacts of an interrupting chamber in opposite directions via an insulating tube
US7642480B2 (en) * 2006-10-09 2010-01-05 Areva T&D Sa Actuating the contacts of an interrupting chamber in opposite directions via an insulating tube

Also Published As

Publication number Publication date
CH398741A (de) 1966-03-15
AT235384B (de) 1964-08-25
DE1151586B (de) 1963-07-18

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