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US2871319A - Circuit interrupter - Google Patents

Circuit interrupter Download PDF

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Publication number
US2871319A
US2871319A US616758A US61675856A US2871319A US 2871319 A US2871319 A US 2871319A US 616758 A US616758 A US 616758A US 61675856 A US61675856 A US 61675856A US 2871319 A US2871319 A US 2871319A
Authority
US
United States
Prior art keywords
arc
plate
chute
slots
arc chute
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
US616758A
Other languages
English (en)
Inventor
Robert C Dickinson
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 to DENDAT1069257D priority Critical patent/DE1069257B/de
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US616758A priority patent/US2871319A/en
Priority to FR1183800D priority patent/FR1183800A/fr
Application granted granted Critical
Publication of US2871319A publication Critical patent/US2871319A/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
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate

Definitions

  • This invention relates to circuit interrupters in general and, more particularly, to arc-extinguishing structures therefor.
  • a general object of the invention is to provide an improved circuit interrupter in which the established arc may be more effectivelyv interrupted than in arc-interruptiug structures heretofore employed in the industry.
  • a more specific object of the present invention is to provide an improved arc chute for effecting the extinction of an established arc, which are chute comprises a plurality of spaced plate portions having a slot configuration such that the heating effect is distributed over a wider area, and hence cooling and are extinction more quickly occurs.
  • Another object of the invention is to provide an improved arc chute for a magnetic air circuit interrupter of the type in which an established arc is moved laterally into an arc chute, in which a plurality of substantially parallel disposed arc-interrupting passages are provided so that the established arc is encouraged to be divided into two are streams, each of which is subjected to strong and effective arc-extinguishing action.
  • Yet a further object of the invention is to provide an improved arc chute having a plurality of spaced plate portions, a plurality of which each possesses a doubleslotted construction to encourage arc division.
  • An ancillary object of the present invention is to provide an improved arc chute for a magnetic air type of interrupter in which each of a plurality of plate portions has a pair of inverted, closed slots, the upper ends of the closed slots being off center, so that a pair of substantially parallel arc chute passages result, each of which is formed by a group of one of the two slots, in each of a plurality of plate portions.
  • Figure 1 is a side elevational view, partially in vertical section, of an air-break type of circuit interrupter, embodying the invention and shown in the closed-circuit position;
  • Fig. 2 is a vertical sectional view taken along the line IIII of Fig. 1, looking in the direction of the arrows;
  • Fig. 3 is an enlarged plan view of one of the arc-extinguishing plate portions forming the arc-extinguishing structure
  • Fig. 4 is an edge view of the plate portion illustrated in Fig. 3.
  • Fig. 5 is an enlarged, fragmentary, sectional view taken substantially along the line V-V of Fig. 2, looking in the direction of the arrows.
  • the reference numeral 1 generally designates suitable contact structure which, when separated to the open circuit position, establishes an arc which is moved upwardly into an arc chute, generally designated by the reference numeral 2, as a result of the transverse magnetic field set up by the blowout coil 3 and associated magnet structure 4.
  • a rotatable contact arm 5 carries a conducting bridge 6, which, in the closed-circuit position, as shown in Fig. l, interconnects stationary main contacts 7, 8.
  • a contact stud 9 carries the current from the stationary main contact 7, thorugh an insulating bushing 10 to the external circuit.
  • the contact stud for the stationary main contact 8 is not shown, but it may be identical to the contact stud 9.
  • the electrical circuit comprises the contact stud 9, stationary main contact 7, conducting bridge 6, stationary main contact 8, to the contact stud therefor, not shown, to the external circuit.
  • the contact arm 5 is rotated in a clockwise direction about a pivot pin, not shown, but which is in electrical contact with the stationary main contact 8, to draw an are between the arcing contacts 11, 12 after the separation of conducting bridge 6 from the main contacts 7, 8.
  • blowout coil 3 When this occurs, the blowout coil 3 will be put into series circuit and the transverse magnetic field set up thereby between the field pole members 14 (Fig. 2) will move the established arc upwardly along the arc terminal members 18, 19 into the arc chute 2.
  • the electrical circuit now comprises contact stud 9, conductor 20,- blowout coil 3, contact clip 15, are terminal member 18, the arc itself, are terminal member 19, flexible shunt 28, contact arm 5 to the other contact stud, not shown.
  • the arc chute 2 comprises aninsulating rectangularlyshaped housing member 22 positioned adjacent toan insulating plate 21, the latter serving as a base for the blowout coil 3. Within the housing 22 is placed a plate 24 composed of an insulating material. Two insulating spacer strips 25 space a plate 26, composed of an insulating material, away from the plate 24. The plate 26 may have a plurality of apertures 27 formed therein which facilitate the venting of arc gases therethrough, partic ularly when high currents are to be interrupted. Two more insulating spacer strips 25 space the plate 26 from a plurality of plates 29, forming a unitary plate assembly.
  • the plates 29 are composed preferably of a refractory insulating material, such as a zircon porcelain, which does not give off gas when contacting an arc.
  • the plates 29 have a construction more clearly shown in Figs. 3 and and are separated by pairs of asbestos rope 35.
  • a second insulating plate 26 which is spaced by spacer strips 25 from the right-hand plate 29 of the plate assembly.
  • Two additional spacer strips 25 space the right-hand plate 26 from a refractory plate, not shown, which is, in turn, separated from the right-hand end of the housing 22 by a plurality of strips of fish paper.
  • Bolts 33a secure the several strips 25, plate 26 and the housing 22 to the Plate 21.
  • Bolts 34a secure the right-hand plate 26 and its spacer strips 25 and fish paper strips to the housing 22.
  • the plates 29 and the spacer strips 35 are cemented together in a preliminary process to form a unitary plate assembly which may be bodily placed into the rectangular housing 22.
  • Insulating holding strips 39 are secured by bolts 38 to the opposed inner sides of the housing 22 to prevent the unitary assembly of plates 29 from being forced upwardly out of the housing 22 by the pressure of gas formed during the interrupting operation.
  • each plate 29 has provided therein a pair of closed slots 30, 31, the upper closed ends of which, respectively 40, 41, are unequal distances from the sides of the plate, as will be apparent from a comparison of the distances D D
  • the intervening plate portion 29a between the two slots 30, 31 of each plate 29 terminates in a relatively sharp splitter portion 29b facing the contacts.
  • the upper closed ends 40, 41 do not align with each other, as is indicated in Fig. 2.
  • This will form a pair of substantially parallel arc passages 43, 44 extending lengthwise along the arc chute 2, for the reception of the arc.
  • Each are 46, 47 carries approximately one-half of the total current, so that the local surface temperatures are considerably lower than if the same total current were in one set of slots.
  • the upper limit of current interrupting ability thus is higher for the double slot construction than for the single slot construction.
  • an improved arc-chute construction in which a plurality of double-slotted plates are employed.
  • the closed ends of the slots are unequal distances from the side walls of the arc chute, so that a pair of zig-zag arc passages 43, 44, in parallel, are provided along the arc chute 2.
  • the initially established arc is encouraged to divide into two arcs 46, 47, in parallel, each moving within one of the zigzag arc passages 43, 44, becoming restricted, and finally being extinguished.
  • a staggered construction is not absolutely necessary, and the invention includes in its broader aspects a double-slotted plate construction, in which the closed ends of the slots may be an equal distance from the side walls of the arc chute, as will readily be apparent to one skilled in the art.
  • a staggered construction is employed to obtain in addition to the restriction of the arc column, an additional progressive lengthening of the arc column, as is indicated in Fig. 5.
  • the invention encourages the subdivision of an established are into two parallel arc portions, each of which has intensive deionizing action brought to bear thereon.
  • the current-interrupting ability of the arc chute is consequently increased without any increase in over-all size of the interrupter.
  • An air-break magnetic circuit interrupter including contact means for establishing initially a single arc, an arc chute of generally rectangular shape having side wall portions and end wall portions for receiving said single arc and for causing its subsequent subdivision into two, generally parallel disposed arcs, each of said two arcs extending substantially the entire length of said generally rectangularly-shaped arc chute, said are chute including a multiplicity of spaced, parallel disposed insulating plate portions extending generally transversely of said initially established single are, a plurality of said insulating plate portions each having only two spaced, closed tapered slots therein, each tapered, closed slot having a widened portion near to the contact means smoothly tapering to a restricted closed portion more re mote from said contact means for gradual restriction of the arc column as it moves outwardly from the widened to the restricted portion, the intervening plate portion between the two slots of each plate terminating in a relatively sharp splitter portion near to said contact means, the closed ends of the two slots in each plate portion being spaced unequal distances from the side wall portions

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
US616758A 1956-10-18 1956-10-18 Circuit interrupter Expired - Lifetime US2871319A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DENDAT1069257D DE1069257B (fr) 1956-10-18
US616758A US2871319A (en) 1956-10-18 1956-10-18 Circuit interrupter
FR1183800D FR1183800A (fr) 1956-10-18 1957-10-17 Interrupteurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US616758A US2871319A (en) 1956-10-18 1956-10-18 Circuit interrupter

Publications (1)

Publication Number Publication Date
US2871319A true US2871319A (en) 1959-01-27

Family

ID=24470833

Family Applications (1)

Application Number Title Priority Date Filing Date
US616758A Expired - Lifetime US2871319A (en) 1956-10-18 1956-10-18 Circuit interrupter

Country Status (3)

Country Link
US (1) US2871319A (fr)
DE (1) DE1069257B (fr)
FR (1) FR1183800A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2967220A (en) * 1958-11-18 1961-01-03 Westinghouse Electric Corp Circuit interrupters

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2584570A (en) * 1950-02-07 1952-02-05 Westinghouse Electric Corp Circuit interrupter
US2655578A (en) * 1950-10-02 1953-10-13 Allis Chalmers Mfg Co Arc chute with notched barrier plates

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE293332C (fr) * 1930-08-14
FR1089828A (fr) * 1953-12-23 1955-03-22 Merlin Gerin Plaques réfractaires pour chambres d'arc multiplaques

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2584570A (en) * 1950-02-07 1952-02-05 Westinghouse Electric Corp Circuit interrupter
US2655578A (en) * 1950-10-02 1953-10-13 Allis Chalmers Mfg Co Arc chute with notched barrier plates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2967220A (en) * 1958-11-18 1961-01-03 Westinghouse Electric Corp Circuit interrupters

Also Published As

Publication number Publication date
FR1183800A (fr) 1959-07-13
DE1069257B (fr) 1959-11-19

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