US2449208A - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
US2449208A
US2449208A US641571A US64157146A US2449208A US 2449208 A US2449208 A US 2449208A US 641571 A US641571 A US 641571A US 64157146 A US64157146 A US 64157146A US 2449208 A US2449208 A US 2449208A
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US
United States
Prior art keywords
contact
circuit breaker
arc
circuit
pins
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
US641571A
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English (en)
Inventor
Eichenberger Ernst
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.)
BBC Brown Boveri AG Germany
Original Assignee
Bbc Brown Boveri & Cie
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 Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US2449208A publication Critical patent/US2449208A/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
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle
    • H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle for interrupting DC

Definitions

  • circuit breakers For use on alternating current circuits; 'circuit breakers have been' disclosedwhichfcomprise at least'- one hollow, nozzlercontactthrough which .the
  • Circuit-breakers of the lattertype',.howeveiare not suitable for! use f in interruptingdirect current loads because, in a direct current system, theamplitude of the current? and. voltage Visrmaintained atsload values and' hencer doesznot possess a, .zero characteristic as in alternating.; current systems.
  • Arr object of thislfinvention is to providea novel and improved circuitbreaker construction for use on circuitswhich carry direct 'current' loads.
  • ⁇ .In a preferred formffmy improved circuit..y breaker includes'a pair of contact e1ements,'ronezof which is hollow, ⁇ and the; other-being 4,in the shape, of; a pin ⁇ havinglaniend portiorrwhichfenters5 and nor- :r1-'allyv rests? against :the lower-wendfofr the hollow contact-tdrclose a "circuit therethrough.
  • v-:lnei ytwoi contactelements are mounted sothat oneofthem separatesffrom the other whensubjected to a blast of' gas under-pressure-
  • An arc blowingrchamber ⁇ adj oins thehollowcontact and the sidewall thereofr supports a"-plurality-of-metal pins whichare arranged vertically'oneabove the other.
  • One of the circuit"breaker'contacts has 'connected to it amaro-receiving eleotrodewhich extendsinto the lower end of the blowing" chamber.
  • Fig, l is a vertical section"showing1 a construction wherein twol circuit breaker sections each embodying the invention are connectedlin series.
  • flig.M la is av transversefsection taken'fonline Ict-#Ia ofliig. l.
  • Fig. 2y alsok al verticalfsection -showsvvv ⁇ another arrangeirientfwherein ⁇ Va single gas conduit is used to feed gas to; the contact/i vsets off both "circuitbreaker sections.
  • Atank I having a flattop'surface isf'provided, and. is adapted-'tc receive gas underpr'essure from pipe 2 and to supply the'- pressure fg'as' to the circuit through a control valve 3.
  • Twoicircuit'breaker sectionsld and-idf embodying thelinvention are supported by tank .I.
  • v.Thelower section I is bowl-'shaped and the bottom'thereofterminates in a ilange Il] which restsnupon': anlannulareinsulator I I, lthe latter being supported upon and'in communication with theiinterior tif-:tank Ilkthrough the valve 3.
  • One side of fthedirectfr currentc'ircuit to be broken is connectedatfterminal .I 2 to thev lower :section l.
  • .;'Ihecontact structure of .circuit breakerl section 4,1'which'ish'ousedwithin chamber 9 includes a hollowl Contact'. ⁇ element I3 which may be cylindri'cal, ⁇ 'as snown,ortapered. outwardly from the bottom,"anda pintype.contactelement I4 cooperating therewith.
  • Pin I4 is iixed in position by means of supporting ribs I8 which extend upwardly from the lower section 1 of contact chamber 9.
  • Contact element I3 is provided with a ilange 20 at the bottom thereof.
  • the upper section 6 of contact chamber 9 also carries an internal flange 2I.
  • a coil spring 22 inserted between the two flanges 20 and 2I urges the lower end of hollow contact element i3 into engagement with the enlarged medial portion I of contact pin I4.
  • tubular housing 23 Adjacent the upper or outlet side of the hollow contact I3 is a. tubular housing 23 which may be cylindrical, as shown, or tapered outwardly from the bottom up, if desired. Housing 23 is made from insulating material and forms an arc blowing chamber for the arc. A plurality of pins 24 of conductive material are arranged in vertically spaced relation inside of the housing and are supported in the wall thereof, it being noted that these pins project through the wall on both sides.
  • tubular housing 23 Surrounding tubular housing 23 is another tubular housing 25 also of insulation material which is supported within an annular groove 26 formed at the top of the upper contact chamber portion 6. Supported by, and projecting through, the wall of housing 25 are a plurality of auxiliary pins 21 spaced vertically, there being a pin paired with and at the same level as each of the pins 24.
  • a metallic cap member or mufer 28 extends across the top of housings 23 and 25.
  • circuit breaker section 4' The component parts of the circuit breaker section 4' are constructed and arranged in the same manner as corresponding parts of circuit breaker section 4. Accordingly, corresponding parts of the two circuit breaker sections have been designated by corresponding reference numerals, but with primes added thereto, and no further description of circuit breaker section 4' is deemed necessary.
  • the two circuit breaker sections 4 and 4' are electrically connected in series. Hence metallic caps 28 and 23 are interconnected by conductor 39; corresponding sets of auxiliary pins 21 and 21' are interconnected by conductors 3 I; and the upper contact chamber sections 6, 6 are interconnected by conductor 32.
  • the other side of the line adapted to be broken by the circuit breakers 4 and 4' is connected to terminal I2' on the lower control chamber section 1 of circuit breaker section 4.
  • each of the arc loops travels upwardly to the top of the electrodes I1, I1' which terminate inside of the housings 23, 23', and these end portions of the arcs are bathed on all sides by the pressure gas stream which forces the arcs into the blowing chambers.
  • FIG. 2 A modified construction of a circuit breaker incorporating the invention is shown in Fig. 2.
  • both circuit breaker sections 4a and 4b have a common contact housing, the lower bowl-like portion 1a of which is supported upon a single tubular insulator IIa that is in turn supported upon the tank Ia.
  • the lower portion of the contact housing divides into two chambers 9a and 9b which include hollow contacts I3a, I3b and mating contact pins I4a, I4b.
  • the electrodes Ila and I1b of contact pins, Ilia, I4b differ from the construction used in Fig. l in that the electrodes I1a, Ilb terminate within and just below the top of the hollow contacts I3a, 13b.
  • FIG. 2 In the Fig. 2 arrangement, additional arc-receiving electrodes 34a, 34h are supported upon the hollow contacts I3a,
  • the line terminals I2a, I2b are carried by the housings 6a, 6b in this form of the invention. Operation of the circuit breakers shown in Fig. 2 is substantially the same as that of Fig. 1.
  • circuit breaker sections such as the section on the left in Fig. 1 need be utilized to interrupt a direct current load in which case the projections 21 must be interconnected among themselves and to the contact I3; however, connection of two circuit breaker sections in series is advantageous in that it breaks the arc gap into a greater number of sections which are more easily extinguished.
  • a pressure gas circuit breaker for interrupting a direct current load, a pair of contact elements, one of said elements being hollow, means supporting said contact elements for movement of at least one contact relative to the other to open a circuit therebetween under the action of pressure gas, an inner tubular casing of insulating material constituting an arc blowing chamber, the bottom of said casing being open 'and disposed adjacent said hollow contact, an arc-receiving electrode connected to at least one of said contact elements, said electrode being extended into the lower portion of said casing, a plurality of conductive pins spaced one above the other and extending through the wall of said casing, an outer tubular casing of insulating material surrounding said inner casing and through which pressure gas iiows, and at least one arc attracting electrode located in the space between said inner and outer casings and carrying the potential of the other of said contact elements.
  • a circuit breaker as defined in claim 1 characterized by the feature that said casing is cylindrical.
  • a ⁇ circuit breaker as deiined in claim 1 characterized by the feature that said supporting means for said contact elements include a spring normally urging said elements into engagement with each other but which is yieldable under the action of pressure gas to permit separation of said elements.
  • each said circuit breaker including a pair of contact elements, one of said elements being hollow, means Supporting said contact elements for movement of one relative to the other under the action of gas pressure to open a circuit therebetween, an inner tubular casing of insulating material constituting an arc blowing chamber, the bottom of said casing being open and disposed adjacent said hollow contact element, an arc-receiving electrode connected to at least one of said contact elements, said electrode being extended into the lower portion of said casing, a plurality of metal pins, said pins being spaced one above the other in the wall of said casing, an outer tubular casing of insulating material surrounding said inner casing and through which pressure gas flows, and a plurality of vertically spaced pins extending through the Wall of said outer casing; means connecting corresponding pins in the walls of the outer casings of the two circuit breakers; means connecting said breakers electrically in series; and means for actu
  • each said circuit breaker including a pair of contact elements, one of said elements being hollow, means supporting said contact elements for movement of one relative to the other under the action of gas pressure to open a circuit therebetween, a pair of concentric casings of insulating material constituting arc blo-wing chambers, the bottoms of said casings being open and disposed adjacent said hollow 'contact element, an arc-receiving electrode connected to at least one of said contact elements, said electrode being extended into one of said casings, and a plurality of metal pins in the wall of each said casing, said pins being disposed one above the other and projecting through the walls of said casings at the same levels to form sets of auxiliary arc-electrodes; connections between corresponding pins in the outer casings of said breakers; means connecting the contact elements of said breakers in series; and means for actuating the contact elements of both said breakers simultaneously,

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US641571A 1945-01-26 1946-01-16 Circuit breaker Expired - Lifetime US2449208A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2449208X 1945-01-26

Publications (1)

Publication Number Publication Date
US2449208A true US2449208A (en) 1948-09-14

Family

ID=4569312

Family Applications (1)

Application Number Title Priority Date Filing Date
US641571A Expired - Lifetime US2449208A (en) 1945-01-26 1946-01-16 Circuit breaker

Country Status (5)

Country Link
US (1) US2449208A (en))
BE (1) BE462592A (en))
CH (1) CH243459A (en))
DE (1) DE834709C (en))
FR (1) FR920656A (en))

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1069737B (en)) * 1952-12-23 1959-11-26

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1959183A (en) * 1929-10-31 1934-05-15 Gen Electric Electrical switching apparatus
USRE20044E (en) * 1931-02-09 1936-07-28 Electric circuit-breaker with
US2240233A (en) * 1938-05-27 1941-04-29 Bbc Brown Boveri & Cie Gas blast circuit breaker
US2306186A (en) * 1941-01-27 1942-12-22 Gen Electric High voltage electric circuit breaker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1959183A (en) * 1929-10-31 1934-05-15 Gen Electric Electrical switching apparatus
USRE20044E (en) * 1931-02-09 1936-07-28 Electric circuit-breaker with
US2240233A (en) * 1938-05-27 1941-04-29 Bbc Brown Boveri & Cie Gas blast circuit breaker
US2306186A (en) * 1941-01-27 1942-12-22 Gen Electric High voltage electric circuit breaker

Also Published As

Publication number Publication date
FR920656A (fr) 1947-04-15
DE834709C (de) 1952-03-24
BE462592A (en))
CH243459A (de) 1946-07-15

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