US2795675A - Circuit interrupter - Google Patents

Circuit interrupter Download PDF

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Publication number
US2795675A
US2795675A US473991A US47399154A US2795675A US 2795675 A US2795675 A US 2795675A US 473991 A US473991 A US 473991A US 47399154 A US47399154 A US 47399154A US 2795675 A US2795675 A US 2795675A
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US
United States
Prior art keywords
arc
transfer
core
extinguishing
plates
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
US473991A
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English (en)
Inventor
Russell E Frink
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
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US473991A priority Critical patent/US2795675A/en
Priority to GB33796/55A priority patent/GB785957A/en
Priority to DE1955W0014313 priority patent/DE1769044U/de
Priority to DEW17937A priority patent/DE1047904B/de
Priority to FR1144655D priority patent/FR1144655A/fr
Priority to JP3193655A priority patent/JPS326479B1/ja
Application granted granted Critical
Publication of US2795675A publication Critical patent/US2795675A/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
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet

Definitions

  • the general object of my invention is to provide an improved circuit interrupter, in which improved and more elective arc-extinguishing action takes place.
  • Another object is to provide an improved transfer arcextinguishing means for a circuit interrupter of the type having an electrically floating blowout coil to which the current is transferred by the extinguishing of a portion of the arc playing between two arc terminal members connected to the ends of the blowout coil.
  • a further object is to speed up the transfer into series circuit of the magnetic blowout coil so as to bring about more rapid and effective operation.
  • a further object of my invention is to utilize the shading coil for the blowout magnet in a novel manner so as to provide one or more terminals for the transfer arc-extinguishing means.
  • Still a further object is to provide an improved longer plate structure for the transfer arc-extinguishing means of a circuit interrupter to bring about improved performance and to minimize the possibility of flashover.
  • Figure 1 is a side elevational View, partially in vertical section, of a circuit interrupter embodying the principles of my invention, and the contact structure being shown in the closed-circuit position;
  • Fig. 2 is a plan sectional view of the circuit interrupter of Fig. 1, taken along the line II-II thereof;
  • Fig. 3 is a vertical sectional View taken along the line III- III of Fig. 1;
  • Fig. 4 is a side elevational view of one of the plates utilized in the arc-extinguishing sections;
  • Fig. 5 is a side elevational view of one of the transfer arc-extinguishing plates
  • Fig. 6 is a sectional View taken substantially along the line VI-VI of Fig. 7;
  • Fig. 7 is an enlarged fragmentary sectional View taken substantially along the line VII- VII of Fig. 3.
  • the reference numeral 1 generally designates a circuit interrupter, in this instance being one 0f the air-break type.
  • a circuit interrupter in this instance being one 0f the air-break type.
  • the illustrated specific embodiment of my invention is an air-break. type of circuit interrupter, it is to be clearly understood that certain features of my invention may be applicable to other types of circuit interrupters, say for instance one of the liquid-immersed type or one operating in a gaseous medium. Merely for purposes of illustration do I describe a specific embodiment of my invention which operates in air.
  • the circuit interrupter 1 includes contact structure 2 operable to establish an arc, which is moved upwardly into an arc-chute structure 3, including a pair of arc-extinguishing sections 4 and 5 of substantially identical construction.
  • one terminal L1 of the circuit interrupter is connected to the stationary contact 6 of my device, whereas the other terminal L2 of the interrupter is electrically connected to the movable contact 7 of the device.
  • suitable bridging and secondary contacts may be employed ICC to relieve the stationary and movable arcing contacts 6, 7 from carrying the current in the fully closed-circuit position shown in Fig. l.
  • the moving arcing contact 7 moves away from the stationary arcing contact 6 to establish an arc 8, as shown by the dash line of Fig. l.
  • This arc generally designated by the reference character it, may be considered as composed of three sections 8a, 8b and 8c.
  • the arc 8 of course, bows upwardly because of the natural convection current of air, which is heated by the hot arc 8, and also because of the magnetic forces set up by the arc 8 which act to expand theloop of the arc, as well understood by those skilled in the art.
  • Adjacent the top and central portion of the arc 8 is a pair of transfer arc horns 1G, 11, between which is disposed a transfer arc-extinguishing means, generally designated by the reference numeral 13.
  • the arc portion 8a extends between the movable arcing contact 7 and the transfer arc horn 10.
  • the arc portion 8b extends within the transfer arc'extinguishing means 13 between the transfer arc horns 10, 11.
  • the arc portion 8c extends between the stationary arcing contact 6 and the transfer archorn 11.
  • the function of the transfer arc-extinguishing means 13 is to interrupt the arc portion 8b, and so bring into series circuit the pair of serially related, centrally disposed blowout coils 15, 16, the location of which is more clearly shown in Fig. 2 of the drawings.
  • Such coils of course, have insulated windings.
  • the centrally disposed blowout coils 15, 16 are connected in series circuit together, as by a connection 17 at the top of the coils (Figs. l and 3), and the other lower ends 18, 19 of the blowout coils 16, 15, respectively, are secured to the transfer arc horns 10, 1l, respectively, as shown more clearly in Fig. 1 of the drawings.
  • the transfer arc-extinguishing means 13 is, therefore, desirable to assist in this transfer into series circuit of the blowout coils 15, 16 by extinguishing the arc portion 8b.
  • the transfer arc-extinguishing means 13 includes a plurality of spaced insulating plates 21, the configuration of which is more clearly shown in Fig. 5 ot' the drawings. lt will be noted that each insulating plate 21 has a slot 22 provided therein which tapers inwardly to one side of the center line 23 of the plate.
  • rhe plates 21 are spaced laterally apart by asbestos rope spacers 21a, as more clearly shown in Fig. 2 of the drawings. Adjacent plates 21 may be positioned oppositely so that the slots 22 are alternately on opposite sides of the center line of the plates and provide a zigzag path for the arc.
  • a plurality of the plates 21 are disposed between the transfer arc horns 1t), 11 and the single-turn shading coil 25.
  • the shading coil 25 in t-urn encircles the core or yoke portion 26 magnetically interconnecting the pole plate portions 27, more clearly shown in Fig. 2 of the drawings.
  • arc portion ⁇ or section 8b moves upwardly to strike the lower end 28 of the shading coil 25 to establish two serially related arms 129, 30 which are electrically in series. These arcs'move upwardly within the slots 22 of the insulating transfer plates 21 to become extinguished.
  • the blowout coils 15 and 16 ⁇ are serially connected into the circuit, and the energization -of these coils 15, 16 sets up a magnetic flux within the magnetic ycircuit 24, which includes the pair of side magnetic pole plates 27 and the interconatesora necting yoke 26.
  • the pole plates 27 are formed of vertically extending sheets of 'a suitable magnetic material to forma laminated structure, more clearly shown in Fig. 2 of the drawings. Magnetically interconnect-ing the side pole plates 27 is the central interconnecting core or yoke portion 26, which is encircled by the two serially related blowout coils 15 and 16.
  • the H- type of magnetic circuit 24 shown upon the energization thereof, causes magnetic flux to ow 'between the pole plates 27 in vthe manner indicated by the arrows 20 in Fig. 2.
  • This magnetic flux extending transversely between the pole plates 27 causes upward movement of the are portions Sa, 8c upwardly into the are-extinguishing sections 4, 5 of the arc-chute structure 3.
  • the current path through the interrupter may then be traced, beginning at line L1, through connection 9a, are horn :and terminal plate 9, across the arc in right-hand main extinguishing section 5 to the transfer arc horn or plate 11, lower end 19 of front lblowout coil ⁇ 15, through -coil 15 to the connection 17 at its upper end t-o the upper end of the rear blowout coil 16, through coil 16 to its lower end 18 connected to the arc transfer plate or horn 10, through the arc in main left-hand extinguishing section 4 to the arc terminal plate er horn 12 on thence to line L2.
  • each ceramic plate 40 has a slot 41 provided therein, the upper closed end 42 of which is slightly off-center.
  • the plates 40 are staggered during the assembly operations so as to form 1a 'horizontally disposed, zigzag arc passage 43 throughout the length of the are-chute sections 4, 5 to quickly bring about the extinction of the arc portions 8a, 8c.
  • the plates 4t) are spaced laterally apart, as shown more clearly in Fig. 2, by sections of lasbestos rope 44 cemented between the plates 4.0 adjacent the outer edges thereof, the method being identical to that previously referred to in spacing the insulating plates 21 of the transfer arcextinguishing means 13 apart.
  • the transfer stack is made ofsubstantially full length plates 21 and divided into two sections 31, 32 and placed in the spaces between the transfer horns 10, 11 and the shading coil 25.
  • the transfer are 8b now divides into two sections 29, 39, with the shading coil 25 forming a common terminal between them.
  • an insulating spacer plate 38 is utilized between the pole plate portions 27 and the blowout coils 13, 14 for insulation purposes.
  • circuit interrupters of the center-coil type concerns improvements particularly adapted for circuit interrupters of the center-coil type.
  • certain features may be applied to circuit interrupters utilizing a magnetic circuit of substantially U-shape, in which a transfer arc-extinguishing means is associated with the core of such magnet.
  • a circuit interrupter including means for establishing an are, a magnet structure including an oblong core and pole plate portions for assisting in the extinction of the arc, one or more blowout coils encircling the core, a pair of transfer arc horns on opposite sides of the long sides of the core and spaced therefrom, one terminal of a blowout coil connected to each transfer arc horn, and a transfer arc-extinguishing structure of insulating material disposed between the long sides of the core and each transfer arc horn.
  • an H-shaped magnet structure for extinguishing the arc including a core and a pair of pole plate portions, a shading coil about the core, one or more magnetic blowout coils encircling the core to set up a magnetic eld therein, a pair of transfer are horns on opposite sides of the core and spaced from the shading coil, one terminal of a blowout coil connected to each transfer arc horn, and transfer arc-extinguishing means disposed between the shading coil and each transfer arc horn.
  • a circuit interrupter including means for establishing an arc, a magnet structure including an elongated core and pole plate portions for assisting in the extinction of the arc, one or more blowout coils encircling the core, a transfer arc horn spaced away from a long side of the core, one terminal of one of said blowout coils being connected to said transfer -arc horn, and transfer arc-extinguishing plate means disposed between the transfer arc horn and the core to effect extinction of a portion of said arc.
  • a circuit interrupter including means for establishing an arc, a magnet structure including an oblong core and pole plate portions for assisting in the extinction of the arc, one or more blowout coils encircling the core, a transfer arc horn spaced away from :a long side of the core, one terminal of one of said blowout coils being connected to said transfer arc horn, a main arc horn spaced from said transfer arc horn, said arc moving into engagement with the two arc horns, and a relatively long transfer arc-extinguishing structure disposed between the transfer arc horn and a long side of the core to effect extinction of a portion of said anc.
  • a circuit interrupter including means for establishing an arc, an H -shaped magnet structure including a core and pole plate portions for assisting in the extinction of the arc, one or more blowout coils encircling the core, a pair of transfer arc horns positioned substantially parallel to and on opposite sides of the core, one terminal of each of said blowout coils being connected to one of said transfer arc horn-s, and a transfer arc-extinguishing structure including a plurality of spaced plates disposed between each said transfer arc horn and the adjacent side of the core of the H-shaped magnet structure, and the spaced plates being substantially parallel to said adjacent sides of the core Iand effecting extinction of a portion of said established arc.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
US473991A 1954-12-08 1954-12-08 Circuit interrupter Expired - Lifetime US2795675A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US473991A US2795675A (en) 1954-12-08 1954-12-08 Circuit interrupter
GB33796/55A GB785957A (en) 1954-12-08 1955-11-25 Improvements in or relating to electric circuit interrupters
DE1955W0014313 DE1769044U (de) 1954-12-08 1955-11-28 Schalter mit lichtbogenkammer.
DEW17937A DE1047904B (de) 1954-12-08 1955-11-28 Schalter mit Lichtbogenkammer
FR1144655D FR1144655A (fr) 1954-12-08 1955-12-07 Dispositif d'extinction d'arcs pour interrupteurs magnétiques
JP3193655A JPS326479B1 (de) 1954-12-08 1955-12-08

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US473991A US2795675A (en) 1954-12-08 1954-12-08 Circuit interrupter

Publications (1)

Publication Number Publication Date
US2795675A true US2795675A (en) 1957-06-11

Family

ID=23881791

Family Applications (1)

Application Number Title Priority Date Filing Date
US473991A Expired - Lifetime US2795675A (en) 1954-12-08 1954-12-08 Circuit interrupter

Country Status (5)

Country Link
US (1) US2795675A (de)
JP (1) JPS326479B1 (de)
DE (1) DE1047904B (de)
FR (1) FR1144655A (de)
GB (1) GB785957A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3128359A (en) * 1960-01-06 1964-04-07 Westinghouse Electric Corp Circuit interrupters having arc extinguishing means

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH401204A (de) * 1962-06-04 1965-10-31 Bbc Brown Boveri & Cie Leistungsschalter mit einer Unterbrechungsstelle in Luft

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1398982A (en) * 1919-12-15 1921-12-06 Gen Electric Circuit-interrupter
US1872387A (en) * 1929-09-11 1932-08-16 Westinghouse Electric & Mfg Co Circuit breaker
US2616007A (en) * 1947-01-04 1952-10-28 Westinghouse Electric Corp Circuit interrupter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE408129C (de) * 1920-03-11 1925-01-10 Aeg Funkenloeschvorrichtung fuer elektrische Stromunterbrecher
DE540927C (de) * 1928-07-14 1932-01-07 Siemens Schuckertwerke Akt Ges Schalter zum Unterbrechen von Stroemen von sehr verschiedener Stromstaerke mit magnetischer Serienblasung
US1878959A (en) * 1928-09-27 1932-09-20 Westinghouse Electric & Mfg Co Circuit interrupter
US2037418A (en) * 1931-01-24 1936-04-14 Westinghouse Electric & Mfg Co Circuit breaker
DE736512C (de) * 1938-07-07 1943-06-19 Siemens Ag Einrichtung zur Lichtbogenloeschung bei elektrischen Schaltern

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1398982A (en) * 1919-12-15 1921-12-06 Gen Electric Circuit-interrupter
US1872387A (en) * 1929-09-11 1932-08-16 Westinghouse Electric & Mfg Co Circuit breaker
US2616007A (en) * 1947-01-04 1952-10-28 Westinghouse Electric Corp Circuit interrupter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3128359A (en) * 1960-01-06 1964-04-07 Westinghouse Electric Corp Circuit interrupters having arc extinguishing means

Also Published As

Publication number Publication date
GB785957A (en) 1957-11-06
JPS326479B1 (de) 1957-08-20
DE1047904B (de) 1958-12-31
FR1144655A (fr) 1957-10-16

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