US2391759A - Electric circuit interrupter - Google Patents

Electric circuit interrupter Download PDF

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Publication number
US2391759A
US2391759A US497914A US49791443A US2391759A US 2391759 A US2391759 A US 2391759A US 497914 A US497914 A US 497914A US 49791443 A US49791443 A US 49791443A US 2391759 A US2391759 A US 2391759A
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US
United States
Prior art keywords
arc
contact
arcing
contacts
electric circuit
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
US497914A
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English (en)
Inventor
Thomas W Wilcox
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
Application filed by General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US2391759A publication Critical patent/US2391759A/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
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/38—Plug-and-socket contacts
    • H01H1/385—Contact arrangements for high voltage gas blast circuit breakers
    • 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
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/302—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator for fluid insulated switchgear, wherein the insulating fluid is also the working fluid

Definitions

  • My invention rel-ates to electric circuit interrupters and more particularly to a new improved contact arrangement for electric circuit breakers employed for the interruption of heavy currents.
  • FIG. 1 is a sectional view of a portion of an electric circuit interrupter embodying my invention
  • Fig, 2 is a view taken .on line 2--.2 of Fig. 1.
  • my invention is of general application and may be used in circuit interrupters of various types, it is of particular use in alternat mg current fluid blast electric circuit breakers wherein arc extinction is brought about by the action of a blast of fluid such as compressed air or' gas.
  • the invention is furthermore particularly adapted for use in fluid blast circuit breakers in which the direction of the blast is parallel with but opposite to the direction of movement of the switching member.
  • a cylindrical insulating arc extinguishing chamber l0 formed of insulating material and provided with a portion of restricted cross-sectional area H which will hereinafter be referred to as a nozzle, or restriction H.
  • a pair of relatively movable contacts comprising a fixed contact generally indicated at l2, and a movable rod contact l3.
  • Fixed contact I2 is suitably supported above nozzle H and is in the form of an annulus or socket member which forms a nozzle contact through which the blast of fluid, such as air, is directed.
  • fixed contact 12 is provided with spring biased contact members M for electrically engaging rod contact I 3 which latter may be in the form of a tube as shown in Fig. 1, if desired.
  • any suitable means for causing relative separation between contacts I2 and I3 may be provided.
  • I have chosen to illustrate this means as comprising a piston l5 reciprocatingly mounted in a suitable cylinder within arc extinguishing chamber l0. Piston I5 is operatingly connected to rod contact I3. A suitable spring I6 is provided which biases rod contact l3 into conducting engagement with fixed contact [2. The upward movement of rod contact I3 is limited by means of a stop I! supported within chamber l0. Arc extinguishing chamber [0 is connected at a point above piston l5 and below nozzle II with a source of fluid under pressure (not shown) by means of conduit 18.
  • the circuit interrupter is disclosed at an intermediate point during the opening operation when fluid under pressure is being supplied through conduit i 8 causing piston 15 to move downwardly and furthermore causing a blast of fluid to flow through nozzle I l and nozzle contact [2 to extinguish the arc drawn between relatively movable contacts l2 and I3.
  • spring IE will force rod contact [3 toward nozzle contact l2 to reclose the circuit.
  • Contacts l2 and 13 are respectively connected to line terminals [9 and 20, schematically shown.
  • arcing members 2! associated with fixed contact [2 as will become apparent from the 'following description which are arranged with their longitudinal aXes in a plane at right angles to the path of movement of movable contact is and disposed tangentially to a circle concentric with the axis of'this path 'of movement.
  • as being welded or otherwise suitably fastened to an annular conducting member 22 which is suitably mounted above contact l2. and electrically connected thereto.
  • the arcing members 2! are arranged to be connected to one another at their outer ends and also to the source of current supply through terminal IS.
  • the arcing members furthermore, all extend in the same direction from the circle to which they are tangential, which may be clockwise or counterclockwise.
  • I have illustrated the arcing members as extending from the circle to which they are tangential in a counterclockwise direction.
  • a pair of relatively movable contacts comprising a fixed contact and a movable contact, means for producing relative separation of said contacts to draw'an arc therebetween, a conducting member electrically connected to said fixed contact and normally carrying no current, a plurality of arcing members arranged with their longitudinal axes in a plane at right angles to the path of said movable contact and being mechanically supported and electrically connected to said conducting member, said arcing members being disposed tangentially to a circle concentric with the axis of said path of said movable movable contact, and means fortransferring said are from said fixed contact to one of said arcing members, the arrangement of said arcing members with respect to each other and the contacts being such that the path of the current flowing between said movable contact and said conducting member including said are is in the form of a loop so that the electromagnetic force produced causes the arc roots to move from arcing member to arcing member thereby minimizing erosion of said members.
  • a pair of relatively movable contacts comprising a fixed contact and a movable contact, means for producing relative separation of said contacts to draw an arc therebetween, an annular conducting member electrically connected to said fixed contact and normally carrying no current, a plurality of arcing members arranged with their longitudinal axes in a plane at right angles to the path of said movable contact and being mechanically supported and electrically connected to said annular member, said arcing members being disposed tangentially to a circle concentric with the axis of said path of said movable contact, and means for transferring said are from said fixed contact to one of said arcing members, the arrangement of said arcing members with respect to each other and the contacts being such that the path of the current flowing between said movable contact and said annular member including said are is in the form of a loop so that the electromagnetic force produced causes the arc roots to move in a generally circular path from arcing member to arcing member thereby minimizing erosion of said mem bers.
  • an electric circuit interrupter for controlling an associated electric circuit comprising'a pair of contacts at least one of which is movable so that said contacts are separable to draw an arc therebetween, means for connecting said contacts with said associated circuit, one of said contacts having associated therewith, in conducting relation, a plurality of fixed arcing members arranged with their longitudinal axis at an angle approximating a plane normal to the path of the moving contact, each arcing member being disposed tangentially to a circle surroundingthe axis of said path with all of said arcing members extending in the same.
  • an electric circuit interrupter comprising a pair of contacts at least one of which is movable so that said contacts are separable to draw an arc therebetween, an arcing member normally carrying no current arranged with its longitudinal axis in a plane at right angles to the path of said movable contact and disposed tangentially to a circle concentric with the axis of said path, and means for causing the arc drawn between said contacts to appear between said movable contact and said arcing member whereby the path of the current flowing through said arc is in the form of a loop so that the electromagnetic force produced causes the arc to move along said arcing member to minimize erosion of said member.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
US497914A 1942-08-11 1943-08-09 Electric circuit interrupter Expired - Lifetime US2391759A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2391759X 1942-08-11

Publications (1)

Publication Number Publication Date
US2391759A true US2391759A (en) 1945-12-25

Family

ID=10905570

Family Applications (1)

Application Number Title Priority Date Filing Date
US497914A Expired - Lifetime US2391759A (en) 1942-08-11 1943-08-09 Electric circuit interrupter

Country Status (2)

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US (1) US2391759A (de)
DE (1) DE829475C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599848A (en) * 1942-05-30 1952-06-10 Latour Andre Spark arrester for pressure gas switches
US2626332A (en) * 1950-07-27 1953-01-20 Mcgraw Electric Co Electrical switch

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599848A (en) * 1942-05-30 1952-06-10 Latour Andre Spark arrester for pressure gas switches
US2626332A (en) * 1950-07-27 1953-01-20 Mcgraw Electric Co Electrical switch

Also Published As

Publication number Publication date
DE829475C (de) 1952-01-24

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