US2131000A - Electric circuit interrupter - Google Patents

Electric circuit interrupter Download PDF

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Publication number
US2131000A
US2131000A US146253A US14625337A US2131000A US 2131000 A US2131000 A US 2131000A US 146253 A US146253 A US 146253A US 14625337 A US14625337 A US 14625337A US 2131000 A US2131000 A US 2131000A
Authority
US
United States
Prior art keywords
chamber
arc
pressure
gas
exhaust
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
US146253A
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English (en)
Inventor
Petermichl Franz
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority claimed from DEA83783D external-priority patent/DE675368C/de
Application filed by General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US2131000A publication Critical patent/US2131000A/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
    • H01H33/7007—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid wherein the flow is a function of the current being interrupted
    • 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
    • H01H33/76—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid wherein arc-extinguishing gas is evolved from stationary parts; Selection of material therefor

Definitions

  • This invention relates to electric circuit interrupters, more particularly to circuit breakers of the gasexpulsion typ wherein automatic generation of an arc-extinguishing gas is efiected within a pressure confining chamber in accordance with the circuit opening operation.
  • Circuit breakers of the aforesaid type have been proposed wherein the arc formed upon opening of the circuit is closely confined within an insulating such that suflicient gas pressure is built up for the interruption of comparatively small currents.
  • a switch chamber of this size isconsiderably longer than that required for the interruption of comparatively heavy load currents whi h can be n r p f r a short p r vated so 'as to be engaged by the contact 2 in 25 tion of the contacts due to the high are pressure generated within the chamber.
  • the principal object of this invention is the provision of animproved circuit interrupter oi the aforesaid type which is efiicient and positive in operation throughout the rated current interrupting range, simple, compact and rugged in construction and designed so as efiiciently to utilize the arc chamber pressure throughout the 5 complete interrupting range.
  • figure thereof is an elevational view partly in section of a circuit breaker oi the gas expulsion type em- 45 bodying the present invention.
  • the gas expulsion type circuit breaker illustrated comprises relatively movable contacts separable within a casting i forming a switch housing.
  • Theefixed contact structure comprises a seg- 50 ment or socket type contact 2 of well-known form normally biased toward contact engagement by a garter spring 2'.
  • the fixed contact 2 is suitably mounted at one end of the casing i which is closed.
  • the chamber 6 is in communication with the inner arc'chamber 5' formed by the tube 5 through pressure exhaust ports I, the chamber 6 exhaustl0 ing at the other end to atmosphere.
  • the are chamber in the present instance is of annular cross-section, a centrally. positioned insulating bolt 8 being in alinement with the center of the movable tubular contact 9.
  • the insulatl5 ing bolt 8 is fixed at one end with respect to the casing l and has a cross-sectional area approaching that of the inner cross-sectional area oi the tubular contact 8 so that the tubular contact, which has a fairly close fit with respect to the 20 insulating tube. 5, has a confining effect on the arc pressure generated within the annular chamber 5'.
  • contact 9 is eleplug and socket fashion. The circuit is opened by lowering the rod 9 at which time an arc is formed in the restricted annular chamber 5.' For the.
  • the insulating 30 tube 5, and preferably also the insulating cylinder 3 are composed of a material adapted to yield an arc-extinguishing gas when subjected to the heat of the are such as fiber, for example.
  • the are chamber exhaust port 1 is spaced a predetermined distance from the fixed contact 2 corresponding to the length of tube 5 required ,for interruption of comparatively heavy load currents.
  • the tube 5 need not extend beyond the exhaust port .1 in order efiectively to interrupt large load currents by reason of the high arc pressure generated by the intense heat of the arc.
  • the additional length of the tube 5 serves to increase the efficiency of the gas blast for low current interruptions by reason of the pressureconfining eifect of 1 the intermediate chamber 6 at low arc chamber pressure.
  • the interrupting operation which takes place very rapidly is not adversely afiected by the exhaust ports 1 since the stationary air in the jacket-like space 6 has a certain counter-resistance, which in the case of low arc pressures in the main chamber is sufficient to permit building up of adequate gas pressure to cause interruption of low current arcs when the contact 9 leaves the lower end of the tube 5.
  • the exhaust chamber 6 can be provided with exhaust openings as at 6' for directing the arc-extinguisha ing gas into the path of the are at the exhaust end of the switch tube.
  • the insulating cylinder 3 also be composed of gas-yielding material so that the hot arc gases passing into the chamber 6 from the ports I act on the intermediate chamber walls further to generate additional gas which is directed through the exhaust passage 6 into the arc path.
  • this generation of gas within the chamber '6 serves to increase the counter-pressure with respect to the arc chamber pressure, thereby increasing the effectiveness of the gas generated within the tube 5.
  • the exhaust ports 7 can, if desired, be located within a diflerent range for automatically regulating the chamber pressure in the interruption of large currents.
  • the ports I may be arranged in spaced rows or along a helical path with respect to the longitudinal axis of the tube 5.
  • An electric circuit breaker of the gas expulsion type comprising relatively movable contacts and insulating means forming an elongated pressure-confining arc chamber within which separation of said contacts takes place, the walls of said chamber being in confining relation to the arc formed upon opening of the circuit and composed of a material adapted to yield an arc-extinguish ing gas when subjected to said arc, said chamber having an intermediate pressure exhaust opening controlled by one of said contacts spaced a predetermined distance from the point of initial contact separation corresponding to the separation required for the interruption of comparatively large load currents, and means forming an exhaust chamber communicating by way of said exhaust opening with said are chamber, said exhaust chamber being in concentric relation to and substantially surrounding, said are chamber.
  • An electric circuit breaker of the gas ex pulsion type comprising coacting fixed and movable contacts-and an insulating sleeve having a comparatively close fit with respect to said movable contact and forming a pressure-confining chamber within which separation of said contacts takes place, the inner walls of said chamber being composed of a material adapted to yield an arc-extinguishing gas when subjected to the are upon opening of the circuit, said insulating sleeve having a pressure exhaust opening controlled by said movable contact intermediate the ends thereof and spaced a predetermined distance from the point of initial separation of said contacts corresponding to the separation required for interruption of comparatively large load currents, said chamber being otherwise pressure-confining between .said exhaust opening and said point of initial separation, the length of the chamber beyond said exhaust opening corresponding to the additional separation required for interruption of comparatively small currents.
  • An electric circuit breaker of the gas expulsion type comprising relatively movable contacts, insulating means forming a pressure-confining chamber within which separation of said contacts takes place, said chamber having a length corresponding to the separation required for the interruption of small currents and having an exhaust opening controlled by one of said contacts spaced a predetermined distance from the point of initial separation of said contacts corresponding to the separation required for interruption of comparatively large currents, and an outer exhaust chamber concentrically disposed with respect to and communicating with said pressureconfining chamber through said exhaust opening, said outer chamber being restricted as to crosssectional area so that low arc pressures in said chamber are not'immediately relieved when said exhaust opening is uncovered during interruption of comparatively low currents.
  • An electric circuit breaker of the gas expulsion type comprising coacting fixed and movable contacts and insulating means forming a pressure-confining sleeve-like arc chamber and an intermediate chamber concentrically positioned with respect to said pressure chamber so as substantially to jacket the same, said pressure chamber having an exhaust port communicating with said intermediate chamber at a point spaced a predetermined distance from the point of initial separation of said contacts corresponding to the separation required for interruption of comparatively large load currents and said intermediate chamber in turn having an exhaust opening for directing gas into the path of said arc at a point beyond the aforesaid exhaust opening and exteriorly of said are chamber.
  • An electric circuit breaker of the gas expulsion'type comprising relatively movable contacts, an insulating casing forming a pressure-confining chamber Within which separation of said contacts takes place, said chamber having a length corresponding to the separation required for the interruption of small currents and having an exhaust opening spaced a predetermined distance from the point of initial separation of said contacts corresponding to the separation required for interruption of comparatively large currents, and an intermediate exhaust chamber communicating with said pressure-confining chamber through said exhaust opening, the inner walls of said intermediate chamber being composed of a ,material adapted to yield an arc-extinguishing gas under the influence of heated arc gases from said pressure chamber, said intermediate chamher having an exhaust opening for directing the gases therefrom into the path of the arc exteriorly of said pressure chamber.
  • An electric circuit breaker of the gas expulsion type comprising relatively movable contacts, insulating means forming a pressure-confining chamber within which separation of said contacts takes place, said chamber having a length corresponding to the separation required for the interruption of small currents and having an exhaust opening controlled by one of said contacts located at an intermediate point corresponding to the separation required for interruption of comparatively large currents, and an intermediate exhaust chamber communicating with said pressure chamber through said exhaust opening, the inner walls of said intermediate chamber being composed of a material adapted to yield an arc-extinguishing gas under influence of heated arc gases from said pressure chamber so as to oppose low arc pressures in said chamber when said exhaust opening is uncovered during 5 interruption of comparatively low currents.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
US146253A 1936-04-15 1937-06-03 Electric circuit interrupter Expired - Lifetime US2131000A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DEA83783D DE675368C (de) 1936-02-22 1936-04-15 Elektrischer Druckgasschalter mit selbsterzeugtem Loeschgas
DEA79109D DE647061C (de) 1936-02-22 1936-04-16 Elektrischer Gasschalter
DEA79789D DE660025C (de) 1936-02-22 1936-06-26 Elektrischer Gasschalter

Publications (1)

Publication Number Publication Date
US2131000A true US2131000A (en) 1938-09-20

Family

ID=41076845

Family Applications (2)

Application Number Title Priority Date Filing Date
US146253A Expired - Lifetime US2131000A (en) 1936-04-15 1937-06-03 Electric circuit interrupter
US205955A Expired - Lifetime US2152497A (en) 1936-04-15 1938-05-04 Electric circuit breaker

Family Applications After (1)

Application Number Title Priority Date Filing Date
US205955A Expired - Lifetime US2152497A (en) 1936-04-15 1938-05-04 Electric circuit breaker

Country Status (6)

Country Link
US (2) US2131000A (en(2012))
BE (3) BE420151A (en(2012))
CH (1) CH205650A (en(2012))
FR (4) FR818173A (en(2012))
GB (3) GB467809A (en(2012))
NL (3) NL49945C (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2840668A (en) * 1956-02-24 1958-06-24 Joslyn Mfg & Supply Co Fuse assembly for cutouts
US3989342A (en) * 1973-05-18 1976-11-02 International Telephone And Telegraph Corporation Chambered arc snuffing tube for bushing assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4683734A (en) * 1986-06-19 1987-08-04 Peterson Carroll T Locked cover for air condition responsive controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2840668A (en) * 1956-02-24 1958-06-24 Joslyn Mfg & Supply Co Fuse assembly for cutouts
US3989342A (en) * 1973-05-18 1976-11-02 International Telephone And Telegraph Corporation Chambered arc snuffing tube for bushing assembly

Also Published As

Publication number Publication date
US2152497A (en) 1939-03-28
FR50097E (fr) 1939-11-21
BE420926A (en(2012)) 1937-05-31
FR818173A (fr) 1937-09-20
GB467809A (en) 1937-06-23
NL48750C (en(2012)) 1940-06-15
CH205650A (de) 1939-06-30
GB470631A (en) 1937-08-18
NL54182C (en(2012)) 1943-03-15
FR820242A (fr) 1937-11-06
GB517447A (en) 1940-01-30
NL49945C (en(2012)) 1941-02-15
BE420151A (en(2012)) 1937-03-31
BE429437A (en(2012))
FR49606E (en(2012)) 1939-05-16

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