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US2632828A - Arrangement in electric air blast circuit breaker - Google Patents

Arrangement in electric air blast circuit breaker Download PDF

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Publication number
US2632828A
US2632828A US688A US68848A US2632828A US 2632828 A US2632828 A US 2632828A US 688 A US688 A US 688A US 68848 A US68848 A US 68848A US 2632828 A US2632828 A US 2632828A
Authority
US
United States
Prior art keywords
nozzle
air
circuit breaker
arrangement
air blast
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
US688A
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English (en)
Inventor
Forwald Haakon
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US2632828A publication Critical patent/US2632828A/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

  • extinction of the arc is usually effected by bringing the arc, in a mouth-piece 0r nozzle, into contact with a stream of compressed air.
  • This nozzle may either be of insulating material or of metal and may in the latter case also serve as one contact of the circuit breaker and may then be arranged in alignment with an extra arcing contact.
  • the contacts of the circuit breaker may be so arranged that one of them in its motion against the other traverses the opening in the nozzle, but the contacts of the breaker may also be so arranged that they remain permanently on the same side of the nozzle but are so arranged that the arc formed at the interruption is blown into the nozzle by the compressed air.
  • the present invention has for its object an arrangement in breakers of this kind, by which a considerable improvement of the breaking effectiveness of such breakers is attained.
  • the present invention is based upon the observation that a considerable improvement in the breaking efiectiveness can be obtained by the removal of the ionized gas which is accumulated on the inlet side of the nozzle during the time the gas stream through the nozzle is blocked by the arc.
  • this ionized gas is removed by the provision of air escape passages located near the inlet opening of the nozzle, said passages commencing in the space surrounding the inlet end of the nozzle in what is hereinafter referred to as the extinguishing air delivery space. These passage may either terminate in the open air or in the air escape space on the outlet side of the nozzle.
  • FIG. l the application of the invention to a circuit breaker is shown and Fig. 2 shows schematically the flowing conditions through the nozzle as a function of the current in the arc.
  • i designates the extinguishing chamher and f. the arcing contact, which is attached to the walls of the chamber by means of ribs 3.
  • 4 is the movable contact and 5 an insulating intermediary wall of the chamber dividing the chamber into an extinguishing air delivery space 8 and air escape space i.
  • the nozzle is arranged in the said wall 5.
  • Wall 5' is of conducting material and forms the main stationary contact.
  • I is a sliding contact sliding against the movable contact. and c a cylinder of insulating material forming a continuation of the chamber l downwards from the intermediary wall 5.
  • 9 are orifices arranged in the intermediary wall 5 near the wall of the cylinder 8 and terminating in the air escape space I, and ID are orifices in the wall of the cylinder 8 near the intermediary wall 5 and terminating in the open air.
  • the orifices 8 and [0 may both be present or, either the orifices II] or 9 may be provided. Generally it is more suitable and also suflicient with only a series of orifices 9, because by this arrangement a blast of gas sidewise from the breaker is avoided.
  • the form shown is such that when the current is large the arc is burning between the movable contact 4 and the stationary contact 2 as the figure shows, but when the current decreases, it is moved over to the arcing contact 2
  • the are when the current is large, will have a small length, so that the arcing voltage and thus the power development will be small.
  • the curve l8 schematically shows the change of the current in the arc and the curve I! shows the eiiective opening of the nozzle corresponding to the amount of gas flowing through the nozzle per time unit.
  • the spaces designated by dots illustrate the accumulation of ionized gas, which occur, if there are no channels or orifices 9 or H! respectively. If, however, such openings are provided, ionized gas will escape through them and be replaced by fresh air coming from below except in the region close to the arc. If then the flow of air commences or is increased according to Fig. 2, the ionized air already from the beginning will be delivered to the nozzle.
  • An air blast circuit breaker comprising a nozzle traversed by a flow of extinguishing air, a main contact pair located in close proximity to the inlet side of said nozzle, an extinguishing air delivery space on the inlet side of said nozzle, an air discharge space on the other side of said nozzle, an intermediary wall separating the air delivery space from the air discharge space, the said nozzle being formed in said wall and the main stationary contact being located in said wall and the main movable contact being located in said air delivery space, and air escape passages leading from the part of said air delivery space in close proximity to said nozzle and upstreamward of at least a part of said main contact pair to permit escape of ionized air from the said delivery space to the open air, While free passage of the stream of ex tinguishing air through the nozzle is blocked by the are between the main contacts.

Landscapes

  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US688A 1947-01-15 1948-01-06 Arrangement in electric air blast circuit breaker Expired - Lifetime US2632828A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE265317X 1947-01-15

Publications (1)

Publication Number Publication Date
US2632828A true US2632828A (en) 1953-03-24

Family

ID=20306588

Family Applications (1)

Application Number Title Priority Date Filing Date
US688A Expired - Lifetime US2632828A (en) 1947-01-15 1948-01-06 Arrangement in electric air blast circuit breaker

Country Status (4)

Country Link
US (1) US2632828A (de)
CH (1) CH265317A (de)
FR (1) FR959519A (de)
GB (1) GB643096A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761935A (en) * 1952-07-30 1956-09-04 David C Prince Circuit breaker

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US692735A (en) * 1901-06-17 1902-02-04 James R Thompson Combined electric switch and spark-blow-out mechanism.
US1334645A (en) * 1917-01-13 1920-03-23 Bechoff Ferdinand Air-break switch
US1861128A (en) * 1928-12-28 1932-05-31 Milliken Humphreys High-power circuit-breaker
US1944403A (en) * 1931-05-21 1934-01-23 Clere Andre Arc extinguishing chimney
US1955212A (en) * 1931-03-18 1934-04-17 Electr & Allied Ind Res Ass Circuit breaker
US1987885A (en) * 1932-03-01 1935-01-15 Electr & Allied Ind Res Ass Electric circuit-breaker
US2060282A (en) * 1932-06-04 1936-11-10 Delle Atel Const Electr Electric circuit breaker with compressed gas blow-out
US2133938A (en) * 1933-12-08 1938-10-18 Strauss Frida Electric switch
US2222719A (en) * 1939-07-08 1940-11-26 Gen Electric Air blast circuit breaker

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US692735A (en) * 1901-06-17 1902-02-04 James R Thompson Combined electric switch and spark-blow-out mechanism.
US1334645A (en) * 1917-01-13 1920-03-23 Bechoff Ferdinand Air-break switch
US1861128A (en) * 1928-12-28 1932-05-31 Milliken Humphreys High-power circuit-breaker
US1955212A (en) * 1931-03-18 1934-04-17 Electr & Allied Ind Res Ass Circuit breaker
US1944403A (en) * 1931-05-21 1934-01-23 Clere Andre Arc extinguishing chimney
US1987885A (en) * 1932-03-01 1935-01-15 Electr & Allied Ind Res Ass Electric circuit-breaker
US2060282A (en) * 1932-06-04 1936-11-10 Delle Atel Const Electr Electric circuit breaker with compressed gas blow-out
US2133938A (en) * 1933-12-08 1938-10-18 Strauss Frida Electric switch
US2222719A (en) * 1939-07-08 1940-11-26 Gen Electric Air blast circuit breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761935A (en) * 1952-07-30 1956-09-04 David C Prince Circuit breaker

Also Published As

Publication number Publication date
CH265317A (de) 1949-11-30
GB643096A (en) 1950-09-15
FR959519A (de) 1950-03-31

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