US2761935A - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
US2761935A
US2761935A US301639A US30163952A US2761935A US 2761935 A US2761935 A US 2761935A US 301639 A US301639 A US 301639A US 30163952 A US30163952 A US 30163952A US 2761935 A US2761935 A US 2761935A
Authority
US
United States
Prior art keywords
air
gap
arc
circuit breaker
nozzle
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
US301639A
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English (en)
Inventor
David C Prince
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US301639A priority Critical patent/US2761935A/en
Priority to GB18926/53A priority patent/GB743939A/en
Priority to CH320094D priority patent/CH320094A/de
Priority to FR1081676D priority patent/FR1081676A/fr
Application granted granted Critical
Publication of US2761935A publication Critical patent/US2761935A/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
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts

Definitions

  • This invention relates to electric circuit breakers and more particularly to transverse fluid blast breakers of the type which are used to interrupt high voltage, high alternating current circuits.
  • a iluid blast circuit breaker comprises a housing having two load carrying contacts which are relatively movable with respect to each other to form an air gap for interrupting a high voltage, high current circuit.
  • iiuid directing means such as a suitable nozzle, for directin a gaseous or liquid fluid against one end of a baffle which is located upon the opposite side of the gap so that the arc resulting from separation of the contacts is interrupted during the zero current portion of the cycle by the two layers of dielectric introduced upon either side of the bafe.
  • the sides of the bafe form respectively the sides of two passageways which carry away the expended dielectric fluid. These passageways are made of suicient and preferably progressively increasing area so as to be able to remove the expended fluid without building up substantially any back pressure.
  • the embodiment of the invention chosen for the purpose of illustration comprises an air blast circuit breaker 1i) having a housing 12 of a suitable electrically non-conducting material. Mounted in a slot in the housing is a pair of relatively movable load carrying contacts such as the stationary resilient nger type contact 13 which is secured in the housing and the cooperating movable blade "ice 14.
  • the terminals by means of which the load carrying contacts are tied into the external circuit and the mechanism for reciprocally moving the blade 14 between the open retracted position illustrated and the circuit cornpleting position wherein the end thereof is in contact with the fingers of the stationary contact 13 are conventional and forming no part of the present invention will not be described further.
  • a nozzle 15 Adjacent one side of the slot wherein the movable blade 14 slides is a nozzle 15 which is connected with a supply of compressed air (not shown) by means of a conduit 16.
  • a bafe 17 Directly opposite the mouth of the nozzle 15 is the narrow end of a bafe 17 which is formed of an insulating material and is preferably a part of the housing 12.
  • the opposite sides 18 and 19 of the barrier 17 gradually diverge forming the side walls of two passageways 20 and 21 whose opposite walls are formed respectively by portions 22 and 23 of the housing 12.
  • the ionized air is divided into two equal columns on either side of the barrier 17 and the non-ionized air interposed between the respective columns of ionized air and tip of barrier 17 forms two layers of high dielectric material which increase in thickness as the columns are moved downstream.
  • the voltage be great enough to break down these layers. It will be evident, therefore, that the arc will remain extinguished so long as the velocity of the air stream across the air gap is suicient to increase the thickness of the layers of non-ionized air on either side of the baille at a rate greater than the rate of the rise of voltage across the contacts during the next half cycle.
  • the throughow area of the fluid blast nozzle 15 is substantially less than the combined throughlow areas of the fluid escape passages 2() and 21 at their entrance ends, where these passages lead away from the gap between contacts 13-14.
  • the spent blast fluid can escape freely from the gap through the passages 2G and 21 without building up any substantial back pressure in the gap, in spite of the rapid expansion of the blast fluid as it is heated by the arc.
  • a duid blast breaker for interrupting high voltage, high current circuits which comprises a housing having two electrical contacts adapted to be connected in the circuit and relatively movable with respect to each other to form a gap between the contacts, means located adjacent one side of said gap for directing a uid jet at high velocity through said gap transversely of the direction of relative movement of said contacts, said fluid directing means including a nozzle opening into the gap, and an arcsplitting baille disposed in the housing across the gap from the uid directing means and having a relatively sharp end located adjacent said gap and directly opposite said nozzle, so that the arc formed by the movement of the contacts is forced against said bafe end by the uid blast from the nozzle, said bathe partly defining unrestricted passageways leading from said gap for the escape of expended uid, the discharge end of said nozzle opening abruptly into said gap and having a throughllow area substantially less than that of the gap and substantially less than the combined throughow areas of said passageways at their entrance
  • a fluid blast breaker according to claim 1 wherein the cross sectional area of the respective passageways progressively increases.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)
US301639A 1952-07-30 1952-07-30 Circuit breaker Expired - Lifetime US2761935A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US301639A US2761935A (en) 1952-07-30 1952-07-30 Circuit breaker
GB18926/53A GB743939A (en) 1952-07-30 1953-07-08 Electric circuit-breakers having arc-extinguishing means
CH320094D CH320094A (de) 1952-07-30 1953-07-23 Hochspannungsschalter
FR1081676D FR1081676A (fr) 1952-07-30 1953-07-28 Interrupteur électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US301639A US2761935A (en) 1952-07-30 1952-07-30 Circuit breaker

Publications (1)

Publication Number Publication Date
US2761935A true US2761935A (en) 1956-09-04

Family

ID=23164232

Family Applications (1)

Application Number Title Priority Date Filing Date
US301639A Expired - Lifetime US2761935A (en) 1952-07-30 1952-07-30 Circuit breaker

Country Status (4)

Country Link
US (1) US2761935A (de)
CH (1) CH320094A (de)
FR (1) FR1081676A (de)
GB (1) GB743939A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850600A (en) * 1956-11-20 1958-09-02 David C Prince High voltage circuit breaker
DE1266851B (de) * 1957-11-05 1968-04-25 Merlin Gerin Leitsungsschalter

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1747445A (en) * 1927-10-22 1930-02-18 Westinghouse Electric & Mfg Co Switch
FR710224A (fr) * 1929-12-21 1931-08-20 Delle Atel Const Electr Interrupteur dans l'air pour courant alternatif ou continu à haute tension
US1944403A (en) * 1931-05-21 1934-01-23 Clere Andre Arc extinguishing chimney
FR813543A (fr) * 1935-11-15 1937-06-03 Interrupteur à gaz comprimé
US2253197A (en) * 1938-11-03 1941-08-19 Gen Electric Fluid blast circuit breaker
GB575854A (en) * 1939-12-13 1946-03-07 Harry Harold Gordon Improvements in air-blast electric circuit breakers
US2469459A (en) * 1946-04-23 1949-05-10 Bbc Brown Boveri & Cie Gas blast circuit breaker
US2486127A (en) * 1944-06-26 1949-10-25 Gen Electric Air blast electric circuit breaker
US2629798A (en) * 1948-10-30 1953-02-24 Allis Chalmers Mfg Co Cross air blast circuit breaker
US2632828A (en) * 1947-01-15 1953-03-24 Asea Ab Arrangement in electric air blast circuit breaker

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1747445A (en) * 1927-10-22 1930-02-18 Westinghouse Electric & Mfg Co Switch
FR710224A (fr) * 1929-12-21 1931-08-20 Delle Atel Const Electr Interrupteur dans l'air pour courant alternatif ou continu à haute tension
US1944403A (en) * 1931-05-21 1934-01-23 Clere Andre Arc extinguishing chimney
FR813543A (fr) * 1935-11-15 1937-06-03 Interrupteur à gaz comprimé
US2253197A (en) * 1938-11-03 1941-08-19 Gen Electric Fluid blast circuit breaker
GB575854A (en) * 1939-12-13 1946-03-07 Harry Harold Gordon Improvements in air-blast electric circuit breakers
US2486127A (en) * 1944-06-26 1949-10-25 Gen Electric Air blast electric circuit breaker
US2469459A (en) * 1946-04-23 1949-05-10 Bbc Brown Boveri & Cie Gas blast circuit breaker
US2632828A (en) * 1947-01-15 1953-03-24 Asea Ab Arrangement in electric air blast circuit breaker
US2629798A (en) * 1948-10-30 1953-02-24 Allis Chalmers Mfg Co Cross air blast circuit breaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850600A (en) * 1956-11-20 1958-09-02 David C Prince High voltage circuit breaker
DE1266851B (de) * 1957-11-05 1968-04-25 Merlin Gerin Leitsungsschalter

Also Published As

Publication number Publication date
CH320094A (de) 1957-03-15
FR1081676A (fr) 1954-12-22
GB743939A (en) 1956-01-25

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