US1826772A - Electric circuit breaker - Google Patents

Electric circuit breaker Download PDF

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Publication number
US1826772A
US1826772A US315305A US31530528A US1826772A US 1826772 A US1826772 A US 1826772A US 315305 A US315305 A US 315305A US 31530528 A US31530528 A US 31530528A US 1826772 A US1826772 A US 1826772A
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US
United States
Prior art keywords
discs
breaker
electric circuit
series
moving 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
US315305A
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English (en)
Inventor
Grant Lewis Colin
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.)
Electrical Improvements Ltd
Original Assignee
Electrical Improvements Ltd
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 Electrical Improvements Ltd filed Critical Electrical Improvements Ltd
Application granted granted Critical
Publication of US1826772A publication Critical patent/US1826772A/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
    • H01H33/08—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H33/10—Metal parts

Definitions

  • This invention relates to electric circuitbreakers, its object being the construction of a circuitbreaker in which the arc formed on the opening of the circuit shall be very quickly quenched.
  • the invention relates more particularly to circuit-breakers having an arc-quenching delvice in the form of a series of conducting discs or baboards which surround the movable Contactin close proximity to it as it commences its opening movement.
  • the arc-quenching device comprises a series of conducting discs or like members insulated and slightly separated from each other, the edges of the discs being closely surrounded by a casing or wall which forms a boundary to the spaces between the discs, the moving contact of the circuitbreaker passing through an aperture in the discs.
  • These discs are conveniently separated and supported by insulating rings or like members which surround the edges of the discs and may constitute the casing or Wall referred to as forming the boundary of the spaces between the discs.
  • the discs may be of appreciable thickness, say for example half-aninch, and are preerably formed with an annular groove on each face so that when the discs are assembled the narrow spaces between them merge into larger annular chambers formed by the grooves in the.neighboring faces.
  • the discs themselves may have radial passages leading from the central apertures to other passages or openings for the circulation of oil or gaseous products.
  • Figure l is a diagrammatic sectional elevation of one construction of circuit-breaker according to this invention.
  • igure' is a plan view of one of the discs
  • Figure 3 is a perspective view showing diagrammatically a three-phase double-break circuit-breaker having the improved arcquenching devices.
  • the'circuit-breaker represented diagrammatically has a fixed contact A and a. movable contact A1 mounted in insulators in a tank or casing B. With the details of construction and the connections to the contacts the present invention is not concerned, but it is assumed that the circuit is opened by withdrawing the rod A2 and raising the movable contact A1 into the position shown in dotted lines.
  • a series of discs C say of copper or other conducting material, placed one above the other so that their cen tral apertures C1 form a passage whose wall closely surrounds the movable contact A1 as it moves upwards to open the circuit.
  • each disc On each face of each disc an annular groove C2 is formed and when the discs are placed in position the grooves on adjacent faces register and form an annular chamber round the edge of the space F. These chambers are closed by the separating rings D1 in the construction illustrated although that is not necessarily always the case.
  • Each disc is provided with radial passages C3 leading from the central aperture C1 to a vertical hole or passage G passing through all the discs and separating rings and affording a path for the circulation of oil if the arrangement is oil-immersed.
  • discs are shown as occupying the lower portion of the tank or casing B. This number may vary and will depend upon the length of the opening movement of the movable Contact A1, the power with which the circuit-breaker has to deal and other factors.
  • a space above the discs beneath the top plate of the tank B forms an expansion chamber. The dimensions of this space may vary and in some instances the discs C may practically fill the casing.
  • FIGmatic perspective view forming Figure 3 shows one way in which the improved arc-quenching devices may be emodied in a three-phase double-break oilimmersed circuit-breaker.
  • Each phase has two fixed contacts A3 mounted on conductors A4t in connection with the terminals A5.
  • Each pair of conduct-ors A* is mechanically connected but electrically insulated by bridging pieces A and all three sets of iixed contacts are mounted on a bar A1 supported by rods A8 from the top plate BlL of the tank B2.
  • each contact Fixed adjacent to each contact As is an arc-quenching device I-I.
  • each arc-quenching device comprising a series of closely spaced and insulated conducting discs having a central aperture closely surrounding the movable contacts.
  • the wall or casing forming the boundar to the spaces between the discs would in igure 3 be constituted by the supporting and separating rings of insulating material such as are referred to as D and D1 in Figure 1.
  • Each phase switch has two movable contacts represented in Figure 3 at A". These may be formed by the turned-down ends of a common conducting bar and, as indicated in that ligure, all three pairs of movable contacts, the pairs being suitably insulated from each other, are supported from a bar A1o having operating rods ⁇ A1L1 which pass out through suitable openings in the tank cover.
  • the present invention is not concerned with the details of construction of the parts of the circuit-breaker other than the arcquenching devices and hence those parts are merely represented diagrammatically.
  • the improved arc-quenching device is found to be very efficient in practice, a circuitbreaker of given size breaking satisfactorily circuits of much higher power than can be dealt with by circuit-breakers of the same size and of the usual type. Its eliciency is probably due to a variety of causes, such as the close spacing of the discs, the provision of. the enlarged annular chambers into which the spaces lead, and to the radial passages leadin into the circulatory holes or passages throng the discs and their supports.
  • an arcquenchin device comprising a series of conducting iscs through which the moving contact passes and a series of insulating rings for sup orting said discs so that they are insulated rom one another and are separated from one another by a distance which is small relative to their thickness, said insulating rings grming a wall surrounding the edges of the scs.
  • an arcuenching device comprising a series of conucting discs insulated and slightly separated from one another each disc being formed with an annular oove on each face such grooves in adjacent iscs cooperating to form a larger annular chamber in the narrow space between said adjacent discs, the edges of the discs being closely surrounded by a casing forming a boundary to the spaces between the discs and the discs being rovided with aligned apertures through which the moving contact passes.
  • an arcquenching device comprising a series of conducting discs having aligned apertures through which the moving contact passes and a series of insulating rings for supporting said discs so that they are insulated and separated from each other and for forming a wall surrounding the edges of the discs, each disc being formed with an annular groove so that when the discs are assembled the narrow spaces between them merge into larger annular chambers.
  • an electric circuit-breaker comprising a series of conducting iscs having aligned central apertures through which the moving contact passes and radial passages leading from the central aperture to other passages or openings or t e circulation of oil or gaseous products, discs being insulated and slightly separated from each other and the edges of the discs being closely surrounded by a casing forming a boundary to the spaces between the discs.
  • an arcquenchin device comprising a series o conducting iscs having aligned central apertures through which the moving contact passes and radial passages leading from the central aperture to other passages or openings for the circulation of oil or gaseous productsl and a series of insulating rings for supporting said discs so that they are insulated and separated from each other and for forming a Wall surrounding the edges of the discs.
  • an electric circuit-breaker With a moving Contact of an arcquenchin device comprising a series of conducting iscs having aligned central apertures through which the moving contact passes and radial passages leading from the central aperture to other passages or openings for the circulation of oil or gaseous products and a series of insulating rings for supporting said discs so that they are insulated and separated from each other and for forming a Wall surrounding the edges of the discs,
  • each disc being formed With an annular groove so that when the discs are assembled the narrow spaces between them merge into larger annular chambers.
  • An electric circuit-breaker comprising a tank, insulating oil in said tank, a fixed contact mounted therein and a moving contact supported thereby, a series of conducting discs having aligned apertures through which the moving contact passes and a series of insulating rings for supporting said .discs in the tank so that they are insulated from one another and separated from one another by aI space in Which the oil circulates, the tank being formed so that it surrounds closely said insulating rings.

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  • Circuit Breakers (AREA)
  • Breakers (AREA)
US315305A 1927-11-07 1928-10-26 Electric circuit breaker Expired - Lifetime US1826772A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB29714/27A GB302024A (en) 1927-11-07 1927-11-07 Improvements in or relating to electric circuit breakers

Publications (1)

Publication Number Publication Date
US1826772A true US1826772A (en) 1931-10-13

Family

ID=10295935

Family Applications (1)

Application Number Title Priority Date Filing Date
US315305A Expired - Lifetime US1826772A (en) 1927-11-07 1928-10-26 Electric circuit breaker

Country Status (5)

Country Link
US (1) US1826772A (enrdf_load_stackoverflow)
BE (1) BE355281A (enrdf_load_stackoverflow)
DE (1) DE532961C (enrdf_load_stackoverflow)
FR (1) FR663189A (enrdf_load_stackoverflow)
GB (1) GB302024A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
DE532961C (de) 1931-09-05
BE355281A (enrdf_load_stackoverflow)
FR663189A (fr) 1929-08-17
GB302024A (en) 1928-12-13

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