EP0353355A1 - Lichtbogenlöscheinrichtung - Google Patents

Lichtbogenlöscheinrichtung Download PDF

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Publication number
EP0353355A1
EP0353355A1 EP88307107A EP88307107A EP0353355A1 EP 0353355 A1 EP0353355 A1 EP 0353355A1 EP 88307107 A EP88307107 A EP 88307107A EP 88307107 A EP88307107 A EP 88307107A EP 0353355 A1 EP0353355 A1 EP 0353355A1
Authority
EP
European Patent Office
Prior art keywords
plates
arc
arrangement
circuit breaker
arc extinguishing
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.)
Withdrawn
Application number
EP88307107A
Other languages
English (en)
French (fr)
Inventor
Dante Bagalini
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.)
Circuit Breakers Ind Ltd
Original Assignee
Circuit Breakers Ind 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
Priority claimed from ZA885261A external-priority patent/ZA885261B/xx
Priority claimed from ZA885262A external-priority patent/ZA885262B/xx
Application filed by Circuit Breakers Ind Ltd filed Critical Circuit Breakers Ind Ltd
Publication of EP0353355A1 publication Critical patent/EP0353355A1/de
Withdrawn legal-status Critical Current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
    • H01H9/36—Metal parts
    • 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
    • H01H9/36—Metal parts
    • H01H2009/365—Metal parts using U-shaped plates

Definitions

  • THIS INVENTION relates to circuit breakers and to arc extinguishing arrangements therefor.
  • an arc extinguishing arrangement for a circuit breaker which includes a plurality of plates that are of an electrically conducting material and which are arranged in a series, with the plates substantially parallel to one another and with at least two adjacent plates being paired and being electrically connected.
  • the paired plates may be electrically connected at their leading ends. This may be accomplished by electrically connecting the paired plates by means of a connector, or the plates may be formed from one piece of sheet material that is bent over to form a "U", the base of the "U” forming the leading end.
  • the space between paired plates may be empty so that there is a vacuum between them, or they may be filled by a gas such as air, or they may be filled by spacer members that are of an electrically insulating material.
  • each pair of plates constituted by the base of the "U" may be continuous, or it may have a recess or indentation therein.
  • the Applicants believe that it may be advantageous to have a notch or the like extending into the plates from their leading ends.
  • the plates may be of a ferro-magnetic material.
  • An arc extinguishing arrangement as described above may then be utilized in a circuit breaker with the electrically leading ends of the plates facing towards the contacts of the circuit breaker.
  • circuit breaker which includes an arc extinguishing arrangement as des­cribed above.
  • the arrangement may be located between arc runners of the circuit breaker.
  • the circuit resistance increases because the length of the flow path increases. This has the effect of reducing the arc current, which may be reduced even further by making the plates of a material having a suitably high resistivity. Furthermore, the relatively large area of the plates assists in cooling the arcs.
  • the circuit breaker 10 has a moving contact carrier 12 which carries a moving contact 14.
  • the moving contact 14 engages a stationary contact 16.
  • the circuit breaker 10 further has a first terminal assembly 18 whereby a cable or the like may be connected to the breaker.
  • the terminal assembly 18 is electrically connected with the contact carrier 12 by means of a flexible strap 20 via a bi­metal strip 22 and other components.
  • the circuit breaker 10 also has a second terminal arrangement 24 which is electrically connected with the stationary contact 16 via a stationary conduc­ting link element 26.
  • the link element 26 has a linear portion 28 adjacent to the stationary contact 16, an intermediate curved portion 30 and a linear portion 32 which is adjacent the second terminal assembly 24.
  • the contact carrier 12 similarly, has a section 34 with a linear profile adjacent its contact 14 extending away from the contact 14 in the same direction as the linear portion 28 of the link element 26, to be parallel thereto and to be as close as possible while still providing for adequate electrical insulation.
  • the linear section 34 intersects a further linear section 36 which is angled towards the link element 26. It will be appreciated that the sections 34 and 36 are between the contact 14 and the strap 20, so that current flows through the contact carrier 12 to the contact 14, through the contact 16 and then through the link element 26.
  • the contact carrier 12 also has a nose portion 38 that extends away from the contact 14 towards a reverse arc runner 40.
  • the nose portion 38 comes sufficiently close to the reverse arc runner 40 for current to be transferred to the reverse arc runner 40.
  • the reverse arc runner 40 is also electrically connected with the first terminal assembly 18.
  • the nose portion 38 becomes an extension of the reverse arc runner 40.
  • the circuit breaker 10 also has a line arc runner 42 that extends from the stationary contact 16 and is formed in one piece with the link element 26. Between the arc runners 40 and 42 there is an arc chute area 44. In the arc chute area is an arc extinguishing arrangement 46.
  • This arrangement 46 comprises five sets of paired plates 48.
  • Each set of paired plates 48 is formed from a sheet of a suitably electrically conducting mate­ rial that is also ferro-magnetic. Each sheet is bent into a 'U' which is very narrow such that the length of the legs thereof is much longer than the spacing therebetween.
  • each paired set 48 comprises two parallel plates 50 and 52 connected by a leading edge portion 56. As is clearly seen in Figure 1, the leading edge portions 56 face towards the contacts 14 and 16.
  • each set 48 is filled by a suitably electrically insulating medium which may be a vacuum, a suitable gas, or a suitable material such as is shown at 54.
  • a suitably electrically insulating medium which may be a vacuum, a suitable gas, or a suitable material such as is shown at 54.
  • the leading edge portions may be linear and continuous or they may be notched as is indicated at 58 in Figure 2.
  • circuit breakers 70 and 72 also use the arc extinguishing arrangement 46 which is similarly referenced as in Figures 1 and 2. It will be noted however that the plates 50 and 52 have a slot 74, rather than a notch, so that the carrier 12 can pass therethrough.
  • the breaker 10 of Figure 1 has a stationary contact 16 spaced from the arc extinguishing arrangement 46
  • the breakers 70 and 72 have a stationary contact 16 close to the arc extinguishing arrangement 46 and aligned with the bottom-most plate 50, so that in use, the arc is immediately transferred to the plates 50 and 52 without having to be electromagnetically blown into the arc extinguishing arrangement 46.
  • the breaker 70 of Figure 3 has a reverse loop line terminal 76
  • the breaker 72 of Figure 4 has a linear line terminal 78.
  • a circuit breaker which has an im­proved short circuit interruption rating and it is possible to reduce the size and cost of contacts therefor. Further, with the arc extinguishing arrangement, an arc is rapidly accelerated, arc current is quickly reduced and arc current is progressively reduced as the arc approaches the arc vent. Further, the arc can be quickly and efficiently extinguished without electromagnetic blow off of the arc.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
EP88307107A 1987-04-21 1988-08-01 Lichtbogenlöscheinrichtung Withdrawn EP0353355A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ZA872813 1987-04-21
ZA885261A ZA885261B (en) 1987-04-21 1988-07-20 An electric circuit breaker
ZA885262A ZA885262B (en) 1987-04-21 1988-07-20 An electric circuit breaker

Publications (1)

Publication Number Publication Date
EP0353355A1 true EP0353355A1 (de) 1990-02-07

Family

ID=27420943

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88307107A Withdrawn EP0353355A1 (de) 1987-04-21 1988-08-01 Lichtbogenlöscheinrichtung

Country Status (2)

Country Link
EP (1) EP0353355A1 (de)
AU (1) AU2025188A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0836207A2 (de) * 1996-10-09 1998-04-15 Eaton Corporation Elektrisches Stromschaltgerät mit Wirbellichtbogenlösung
DE102012110411A1 (de) * 2012-10-31 2014-05-15 Eaton Industries (Austria) Gmbh Gleichstromschaltgerät

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1069256B (de) *
US1925858A (en) * 1929-01-23 1933-09-05 Westinghouse Electric & Mfg Co Arc extinguisher structure
DE2616825B2 (de) * 1976-04-15 1980-07-10 Brown, Boveri & Cie Ag, 6800 Mannheim Leitungsschutzschalter
EP0033479A1 (de) * 1980-01-31 1981-08-12 CGE- COMPAGNIA GENERALE ELETTROMECCANICA S.p.A. Lichtbogen-Löschvorrichtung für elektrische Strombegrenzungsschalter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1069256B (de) *
US1925858A (en) * 1929-01-23 1933-09-05 Westinghouse Electric & Mfg Co Arc extinguisher structure
DE2616825B2 (de) * 1976-04-15 1980-07-10 Brown, Boveri & Cie Ag, 6800 Mannheim Leitungsschutzschalter
EP0033479A1 (de) * 1980-01-31 1981-08-12 CGE- COMPAGNIA GENERALE ELETTROMECCANICA S.p.A. Lichtbogen-Löschvorrichtung für elektrische Strombegrenzungsschalter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0836207A2 (de) * 1996-10-09 1998-04-15 Eaton Corporation Elektrisches Stromschaltgerät mit Wirbellichtbogenlösung
EP0836207A3 (de) * 1996-10-09 1998-12-02 Eaton Corporation Elektrisches Stromschaltgerät mit Wirbellichtbogenlösung
DE102012110411A1 (de) * 2012-10-31 2014-05-15 Eaton Industries (Austria) Gmbh Gleichstromschaltgerät

Also Published As

Publication number Publication date
AU2025188A (en) 1990-02-01

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19900808