EP0074529A1 - Schutzschalter mit Vorrichtung zum Einschränken eines Lichtbogens - Google Patents

Schutzschalter mit Vorrichtung zum Einschränken eines Lichtbogens Download PDF

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Publication number
EP0074529A1
EP0074529A1 EP82107758A EP82107758A EP0074529A1 EP 0074529 A1 EP0074529 A1 EP 0074529A1 EP 82107758 A EP82107758 A EP 82107758A EP 82107758 A EP82107758 A EP 82107758A EP 0074529 A1 EP0074529 A1 EP 0074529A1
Authority
EP
European Patent Office
Prior art keywords
arc
contacts
space
extinguishing plates
shields
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Withdrawn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
EP82107758A
Other languages
English (en)
French (fr)
Inventor
Fumiyuki Hisatsune
Shinji Yamagata
Junichi Terachi
Hajimu Yoshiyasu
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0074529A1 publication Critical patent/EP0074529A1/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Withdrawn legal-status Critical Current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
    • 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

  • the present invention relates to a circuit breaker with arc restricting device, the interrupting performance of which is enhanced. More particularly, it relates to the relative arrangement between contactors having arc shields and arc extinguishing plates.
  • Figure 1 Figure 2 and Figures 3(A) and 3(B) show the opened and closed states of contactors and the configuration of the electric arc between the contactors according to the prior art.
  • numeral 1 designates a movable conductor made of copper to which a movable contact 2 is fastened.
  • the movable conductor 1 and contact 2 constitute a movable contactor 11.
  • Numeral 3 designates a stationary contact which is fastened to a stationary conductor 4 made of copper.
  • the stationary contact 3 and conductor 4 constitute a stationary contactor 12.
  • Shown at numeral 5 is an arc extinguishing plate for extinguishing an electric arc 6 which occurs when contacts 2 and 3 are separated.
  • Figure 1 illustrates contactors 11 and 12 in a closed state, wherein electric power is fed from a power supply side to a load side in the order of the components 4 1 3 ⁇ 2 ⁇ 1.
  • the present invention has for its object to enhance the performance of a circuit breaker by surrounding the contacts thereof with arc shields which are made of a material having a resistivity higher than that of the conductors adjoining said contacts, and by appropriately setting the relative arrangement between the contacts and arc extinguishing plates.
  • a pair of electric contactors 11, 12 are provided with arc shields 7, 7 positioned on conductors 1, 4 and formed in a manner so as to conceal the parts of these conductors 1, 4 surrounding contacts 2,3.
  • the arc shields 7 are made of a high resistivity material which is higher in resistivity than that of the conductors 1, 4 which are made of copper.
  • the arc shields 7 may comprise, for example, an organic or inorganic electrically- insulating substance such as ceramics, nichrome, nickel, iron, copper-nickel, copper-manganese, manganin, iron- carbon, iron-nickel, and iron-chromium.
  • arc extinguishing plates 51, 52 and 53 which define an envelope space K when their outer edges are joined, as illustrated in Figure 5.
  • Symbols m, m in Figure 4(A) indicate a pair of spaces of truncated cones whose bottom surfaces are superposed on each other.
  • the truncated cones have apical surfaces which are closed curved surfaces defined by the inner edges 7a of the arc shields 7 adjoining the respective contacts 2, 3, and conical surfaces which form angles of within 35° with respect to normals n set on the outer surfaces of the adjoining parts of the arc shields 7,.7.
  • a space M is defined in such a manner that the pair of truncated cones m, m have their bottom surfaces superposed on each other in the state in which both the contactors 11, 12 are fully open.
  • the relationship of arrangement between both the contactors 11, 12 and the arc extinguishing plates 51, 52, 53 is so determined that the space M contains at least a part of the envelope space K of the arc extinguishing plates 51, 52, 53. Accordingly, the space M and the envelope space K have an overlap part D as shown in Figure 4(B).
  • Letter S indicates the remaining section of the space M.
  • the arc shield 7 functions as follows. As illustrated in Figure 6, the arc shield 7 limits the size of the foot of the arc 6, thereby raising the arc density in the space surrounding the foot of the arc 6. That is, since the arc shield 7 is made of a high resistivity material as described with reference to Figure 4(A), the movement of the foot of the arc 6 along the conductors 1, 4, is limited. As a result, the space proximate to the contact undergoes a pressure rise owing to the high heat of the arc 6.
  • emanating metal particles a which are emitted from the contact 3 where the foot of the arc 6 exists are confined within a narrow range owing to the effect of the arc shield 7.
  • the density of the metal particles a accordingly increases to raise the arc voltage, so that the current limiting performance is enhanced.
  • the arc 6 is confined within the arc space M which is formed of the overlapping parts of the pair of truncated cones m, m set for the respective contacts 2, 3, as depicted in Figure 8(A).
  • the current of the arc 6 chiefly flows within the arc space M in which the metal particles a are existing (refer to Figure 6).
  • the emanating directions of the metal particles a are regulated. Moreover, the tendency of metal particles to flow in the regulated directions is greater for circuit breakers having arc shields 7. Accordingly, in order to bend the arc 6 toward the arc extinguishing plates positioned between both contacts so as to prolong the arc, it is necessary to exert a stronger force on the are 6 than in the prior art or to conversely exploit the intense regulation of the emanating directions of the metal particles of the arc 6 by the arc shields.
  • the arrangement of the contactors 11, 12 and the arc extinguishing plates 51-53 is specified thereby to enhance the performances of the circuit breaker. More specifically, by bringing the arc extinguishing plates 51-53 in Figure 4(A) closer to the contactors 11, 12, the arrangement is so set that the space M contains at least a part of the envelope space K of the arc extinguishing plates 51-53. Thus, the current limiting performance and the interrupting performance are greatly enhanced.
  • the overlapping parts of the arc space M and the envelope space K are defined by the area D shown in Figure 4(B).
  • Figure 9 shows an example in which the opening angle of the movable conductor 1 at the opening of the movable and stationary contactors 11, 12 is made great to enlarge the overlapping area betwen the arc space M and the envelope space K of the arc extinguishing plates 51-53, whereby the arc extinguishing capability is sharply enhanced.
  • the arc 6 comes to have a greater effective length as indicated by a broken line A in the figure, because the emanating directions of the arc 6 are regulated. Accordingly, the arc voltage rises, and the current limiting performance improves.
  • the arc 6 comes into direct contact with the arc extinguishing plates 51-53, it has an intense driving force exerted thereon by the arc extinguishing plates 51-53 and its length increases more, so that the arc voltage rises still more. Further, since the high-temperature and high-pressure part of the arc 6 is directly cooled by the arc extinguishing plates 51-53, the interrupting performance is enhanced.
  • a circuit breaker which is excellent in the current limiting performance and the interrupting performance is provided.

Landscapes

  • Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
EP82107758A 1981-08-24 1982-08-24 Schutzschalter mit Vorrichtung zum Einschränken eines Lichtbogens Withdrawn EP0074529A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1981125801U JPS5830254U (ja) 1981-08-24 1981-08-24 回路しや断器
JP125801/81U 1981-08-24

Publications (1)

Publication Number Publication Date
EP0074529A1 true EP0074529A1 (de) 1983-03-23

Family

ID=14919232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82107758A Withdrawn EP0074529A1 (de) 1981-08-24 1982-08-24 Schutzschalter mit Vorrichtung zum Einschränken eines Lichtbogens

Country Status (3)

Country Link
EP (1) EP0074529A1 (de)
JP (1) JPS5830254U (de)
ZA (1) ZA826005B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206249A2 (de) * 1985-05-10 1986-12-30 Mitsubishi Denki Kabushiki Kaisha Ausschalter
EP0613162A2 (de) * 1993-02-26 1994-08-31 Cesare Gallone Verbindungsvorrichtung zwischen den Kontakten elektrischer Schalter und dergleichen
WO1997001859A1 (en) * 1995-06-26 1997-01-16 Square D Company Arc-resistant shield for protecting a movable contact carrier of a circuit breaker
EP0698899B1 (de) * 1992-07-02 2000-04-19 Mitsubishi Denki Kabushiki Kaisha Schalter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0793093B2 (ja) * 1983-09-28 1995-10-09 三菱電機株式会社 開閉器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310649A (en) * 1964-10-21 1967-03-21 Greber Henry Electrical switch with electrostatic prevention of arc formation
DE1765051A1 (de) * 1968-03-26 1971-07-01 Degussa Elektrische Kontaktanordnung zur raschen Lichtbogenableitung auf fest vorgegebener Bahn
DE1690463B1 (de) * 1968-02-03 1971-10-07 Elektro App Werke Berlin Trept Lichtbogenloescheinrichtung fuer elektrische niederspannungs leistungsschalter
DE1765999A1 (de) * 1967-09-22 1971-11-25 Merlin Gerin Druckkontaktanordnung
DE1765157B1 (de) * 1967-06-01 1972-05-31 Elek Scher App Sprecher & Schu Kontaktvorrichtung fuer Vakuumschalter
DE2513242A1 (de) * 1974-04-03 1975-10-16 Siemens Ag Oesterreich Lichtbogentrennelement zum anbau an elektrische schalter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4940765B1 (de) * 1969-06-13 1974-11-05
JPS4912457B1 (de) * 1969-08-29 1974-03-25

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310649A (en) * 1964-10-21 1967-03-21 Greber Henry Electrical switch with electrostatic prevention of arc formation
DE1765157B1 (de) * 1967-06-01 1972-05-31 Elek Scher App Sprecher & Schu Kontaktvorrichtung fuer Vakuumschalter
DE1765999A1 (de) * 1967-09-22 1971-11-25 Merlin Gerin Druckkontaktanordnung
DE1690463B1 (de) * 1968-02-03 1971-10-07 Elektro App Werke Berlin Trept Lichtbogenloescheinrichtung fuer elektrische niederspannungs leistungsschalter
DE1765051A1 (de) * 1968-03-26 1971-07-01 Degussa Elektrische Kontaktanordnung zur raschen Lichtbogenableitung auf fest vorgegebener Bahn
DE2513242A1 (de) * 1974-04-03 1975-10-16 Siemens Ag Oesterreich Lichtbogentrennelement zum anbau an elektrische schalter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206249A2 (de) * 1985-05-10 1986-12-30 Mitsubishi Denki Kabushiki Kaisha Ausschalter
EP0206249A3 (en) * 1985-05-10 1988-01-20 Mitsubishi Denki Kabushiki Kaisha Circuit breaker
EP0698899B1 (de) * 1992-07-02 2000-04-19 Mitsubishi Denki Kabushiki Kaisha Schalter
EP0613162A2 (de) * 1993-02-26 1994-08-31 Cesare Gallone Verbindungsvorrichtung zwischen den Kontakten elektrischer Schalter und dergleichen
EP0613162A3 (de) * 1993-02-26 1995-02-01 Cesare Gallone Verbindungsvorrichtung zwischen den Kontakten elektrischer Schalter und dergleichen.
WO1997001859A1 (en) * 1995-06-26 1997-01-16 Square D Company Arc-resistant shield for protecting a movable contact carrier of a circuit breaker

Also Published As

Publication number Publication date
JPS5830254U (ja) 1983-02-26
ZA826005B (en) 1983-07-27

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Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE FR GB IT LI

17P Request for examination filed

Effective date: 19830518

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19850109

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TERACHI, JUNICHI

Inventor name: YOSHIYASU, HAJIMU

Inventor name: HISATSUNE, FUMIYUKI

Inventor name: YAMAGATA, SHINJI