EP0233323B1 - Coupe-circuit - Google Patents

Coupe-circuit Download PDF

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Publication number
EP0233323B1
EP0233323B1 EP86115283A EP86115283A EP0233323B1 EP 0233323 B1 EP0233323 B1 EP 0233323B1 EP 86115283 A EP86115283 A EP 86115283A EP 86115283 A EP86115283 A EP 86115283A EP 0233323 B1 EP0233323 B1 EP 0233323B1
Authority
EP
European Patent Office
Prior art keywords
arc
circuit breaker
contactor
contactors
contacts
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
EP86115283A
Other languages
German (de)
English (en)
Other versions
EP0233323A3 (en
EP0233323A2 (fr
Inventor
Shinji Yamagata
Fumiyuki Hisatsune
Junichi Terachi
Hajimu Yoshiyasu
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
Priority claimed from JP3555281U external-priority patent/JPS57147548U/ja
Priority claimed from JP3555681U external-priority patent/JPS57147552U/ja
Priority claimed from JP3555581U external-priority patent/JPS57147551U/ja
Priority claimed from JP3555781U external-priority patent/JPS57147553U/ja
Priority claimed from JP1981035554U external-priority patent/JPH0218516Y2/ja
Priority to EP86115283A priority Critical patent/EP0233323B1/fr
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0233323A2 publication Critical patent/EP0233323A2/fr
Publication of EP0233323A3 publication Critical patent/EP0233323A3/en
Application granted granted Critical
Publication of EP0233323B1 publication Critical patent/EP0233323B1/fr
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
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/102—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/04—Contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H2077/025—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with pneumatic means, e.g. by arc pressure

Definitions

  • the present invention relates to an circuit breaker according to the preamble of claim 1.
  • Fig. 1 shows an embodiment of the invention, in which an enclosure 1 made of an insulator forms the outer frame of a switching device and is provided with an exhaust port 101.
  • a first contactor 2 is constructed of a first rigid conductor 201, and a first contact 202 which is mounted on one end part of the first rigid conductor 201, the other end part of which is turnably supported by a pivot pin 2b on a holder 2a fixed to the enclosure 1.
  • the first rigid conductor 201 is connected to a connection terminal 204 through a flexible conductor 203.
  • a second contactor 3 being movable relative to the first contactor 2 in order to close or open the circuit breaker, is constructed of a second rigid conductor 301 which is operated relative to the first rigid conductor 201 so as to close or open the circuit breaker, and a second contact 302 which is mounted on one end part of the second rigid conductor 301 in a manner to confront the first contact 202.
  • the second rigid conductor 301 is connected to an external conductor (not shown) through a flexible conductor 303, and the intermediate part thereof is turnably supported on one end part of a movable frame member 305 by a pivot pin 304.
  • the other end part of the movable frame member 305 is turnably supported on a supporter 306 by a pivot pin 307.
  • a spring 2A is interposed between the first rigid conductor 201 and the enclosure 1, and a torsion spring 3A is applied to the pivot pin 304 and has its respective end parts held in engagement with the second rigid conductor 301 and the movable frame member 305. These springs bias the first and second contacts 202 and 302, respectively.
  • An operating mechanism 4 for operating the second contactor 3 so as to close or open the circuit breaker, is formed so that one end part of a lower link 401 constituting a linkage is turnably coupled to the pivot pin 304 and that also an operating handle 402 is turnably coupled to the linkage.
  • Arc extinguishing plates 5 extinguish an electric arc struck when the second contact 302 is separated from the first contact 202, and they are supported by a pair of side plates 501 and 502.
  • Arc shields 6 and 7 made of a high resistivity material are respectively mounted on the first and second rigid conductors 201 and 301 in a manner to have the first and second contacts 202 and 302 projecting therethrough and to oppose to the electric arc A.
  • the first and second contacts 202 and 302 are engaged as illustrated in Fig. 3.
  • a high current such as a short-circuit current flows under these conditions
  • the first and second rigid conductors 201 and 301 are electromagnetically repelled on account of parallel currents flowing in opposite directions to each other through these rigid conductors.
  • the first and second rigid conductors 201 and 301 are separated from each other, so that the electric arc A develops across the first and second contacts 202 and 302 as illustrated in Fig. 4.
  • the operating mechanism 4 works to completely separate the second rigid conductor 301.
  • metal particles are reflected by the arc shields 6 and 7 to render the pressure of the arc space high, with the result that the arc is effectively cooled and extinguished.
  • the other end part of the second rigid conductor 301 is turnably supported on the movable frame member 305 by the pivot pin 304
  • the other end part of the first rigid conductor 201 is turnably supported on the supporter 2a by the pivot pin 2b
  • the currents flowing through the first and second rigid conductors 201 and 301 are in parallel and opposite in direction to each other. Therefore, when the high current, such as short-circuit current flows, the first and second rigid conductors 201 and 301 are electromagnetically repelled by the currents flowing therethrough, without waiting for the operation of the operating mechanism 4.
  • the electromagnetic repellence separates both the first and second rigid conductors 201 and 301, to generate the arc A.
  • the rigid conductors Upon the generation of the arc A, the rigid conductors can be separated at very high speed by the pressure rise of the space Q between the arc shields 6 and 7, in addition to the electromagnetic repellent force. Accordingly, the arc voltage starts rising very quickly. Since both the first and second rigid conductors 201 and 301 separate, the arc length stretches, and this raises the arc voltage very greatly conjointly with the effect of the arc shields 6 and 7, so that the peak value of the current to flow through the circuit can be made very small.
  • Fig. 5 is a perspective view showing the arc shield 7.
  • this arc shield 7 is provided with a groove or arc runway 701 which extends from the second contact 302 toward the arc extinguishing plates 5, so as to expose the second movable rigid conductor 301.
  • the arc A runs toward the arc extinguishing plates 5 within this groove, to become effectively extinguished in direct contact with the arc extinguishing plates 5. Due to these arc shields 6 and 7 the arc voltage can be remarkably raised so that a high current-limiting performance can be attained.
  • the circuit breaker of this invention is constructed such that except for a part of the electically contacting surface of either contact of the circuit breaker, the part of a rigid conductor adjacent to the contact as projects to the surrounding space is concealed behind an arc shield (a plate-shaped pressure reflector or a covering such as taping and coating) which is made of a substance of a highly resistive material (called the "high resistivity material” hereinbelow) having a resistivity higher than that of a material forming the rigid conductor, thereby to forcibly inject metal particles into an arc space, and that the electrodes are separated at high speed by a high pressure established owing to the provision of the arc shield.
  • an arc shield a plate-shaped pressure reflector or a covering such as taping and coating
  • high resistivity material there can be used, for example, an organic or inorganic insulator, or a high resistivity metal such as copper-nickel, copper-manganese, manganin, iron-carbon, iron-nickel and iron-chromium. It is also possible to use iron whose resistance increases abruptly in accordance with a temperature rise.
  • the circuit breaker of the present embodiment can prevent the polarity effect on the current-limiting performance from becoming different depending upon whether the polarity on the contact to be separated by the electromagnetic repellence is a cathode or an anode and it can stabilize the current-limiting performance. That is, such beneficial result is achieved by the measure that both the first rigid conductor 201 and the second rigid conductor 301 on which the first contact 202 and the second contact 302 are respectively mounted are formed of the turnable electromagnetic repulsion type.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Claims (4)

  1. Coupe-circuit du type comprenant un mécanisme de déclenchement (4) apte à fermer ou ouvrir un circuit électrique en engageant ou en désengageant une paire de contacts (202, 302), cette paire de contacts (202, 302) étant disposée sur des conducteurs rigides de courant (201, 301) de contacteurs (2, 3), ces contacteurs (2, 3) étant montés à pivot afin de permettre le déplacement vers et en s'éloignant de contacts opposés (202, 302)
       de sorte que le second contacteur (3) est monté à pivot sur le boîtier de coupe-circuit (1) réalisant un contacteur (3) ayant la forme d'un élément de bouton à levier connecté au mécanisme de déclenchement (4),
       de sorte que le premier contacteur (2) est monté à rotation sur le boîtier (1) et est pourvu d'un ressort (2A) qui force le premier contacteur (2) dans la direction à l'encontre du second contacteur (3), et
       de sorte que ces contacteurs (2, 3) sont disposés l'un par rapport à l'autre symétriquement et parallèlement, afin qu'une boucle de courant soit formée à l'état fermé,
       caractérisé en ce que le second contacteur (3) est de plus pourvu d'un autre ressort (3A) contraint et pivotant (304) dans sa partie intermédiaire,
       sur lesdits conducteurs (2, 3) sont disposés des boucliers à arc (6, 7) de façon à entourer les contacteurs respectifs (202, 203), ces boucliers à arc (6, 7) étant réalisés dans un matériau à haute résistivité et
       chacun de ces boucliers à arc (6, 7) étant pourvu d'un chemin de fuite (701) qui s'étend depuis les contacts (202, 302) suivant la direction des plaques d'extinction d'arc (5), afin d'exposer les conducteurs (201, 301) des contacteurs (2, 3).
  2. Coupe-circuit selon la revendication 1, caractérisé en ce que les deux contacteurs (2, 3) sont connectés via des conducteurs flexibles (203, 303) aux plots de connexion externes (204).
  3. Coupe-circuit selon l'une des revendications 1 ou 2, caractérisé en ce que le matériau formant les boucliers à arc (6, 7) est un matériau isolant organique ou inorganique.
  4. Coupe-circuit selon l'une des revendications 1 ou 2, caractérisé en ce que le matériau constituant les boucliers à arc (6, 7) est un matériau à résistivité élevée tel que cuivre-nickel, cuivre-manganèse, fer-carbone, fer-nickel, fer-chrome ou fer.
EP86115283A 1981-03-12 1982-03-12 Coupe-circuit Expired - Lifetime EP0233323B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP86115283A EP0233323B1 (fr) 1981-03-12 1982-03-12 Coupe-circuit

Applications Claiming Priority (11)

Application Number Priority Date Filing Date Title
JP3555681U JPS57147552U (fr) 1981-03-12 1981-03-12
JP3555581U JPS57147551U (fr) 1981-03-12 1981-03-12
JP3555781U JPS57147553U (fr) 1981-03-12 1981-03-12
JP3555281U JPS57147548U (fr) 1981-03-12 1981-03-12
JP35552/81U 1981-03-12
JP1981035554U JPH0218516Y2 (fr) 1981-03-12 1981-03-12
JP35556/81U 1981-03-12
JP35554/81U 1981-03-12
JP35557/81U 1981-03-12
JP35555/81U 1981-03-12
EP86115283A EP0233323B1 (fr) 1981-03-12 1982-03-12 Coupe-circuit

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP82102015.3 Division 1982-03-12

Publications (3)

Publication Number Publication Date
EP0233323A2 EP0233323A2 (fr) 1987-08-26
EP0233323A3 EP0233323A3 (en) 1987-09-09
EP0233323B1 true EP0233323B1 (fr) 1991-10-16

Family

ID=27545384

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115283A Expired - Lifetime EP0233323B1 (fr) 1981-03-12 1982-03-12 Coupe-circuit

Country Status (1)

Country Link
EP (1) EP0233323B1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944566C (de) * 1951-02-08 1956-06-21 Starkstrom Schaltgeraetefabrik Lichtbogenloescheinrichtung
US3599130A (en) * 1968-07-15 1971-08-10 Terasaki Denki Sangyo Kk Circuit interrupter

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3402273A (en) * 1965-12-01 1968-09-17 Ite Circuit Breaker Ltd Arc chamber for circuit breakers
DE1765050B2 (de) * 1968-03-26 1976-08-05 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt Elektrische kontakt- oder elektrodenanordnung zur ortsfesten stabilisierung der lichtbogenfusspunkte und zur verringerung der abbrandverluste
US3997746A (en) * 1974-04-23 1976-12-14 Airpax Electronics, Incorporated Circuit breaker with arc chamber screen
JPS5848979B2 (ja) * 1978-08-10 1983-11-01 富士電機株式会社 回路しや断器
US4409445A (en) * 1980-12-09 1983-10-11 Mitsubishi Denki Kabushiki Kaisha Circuit breaker
US4454395A (en) * 1981-02-27 1984-06-12 Mitsubishi Denki Kabushiki Kaisha Circuit breaker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944566C (de) * 1951-02-08 1956-06-21 Starkstrom Schaltgeraetefabrik Lichtbogenloescheinrichtung
US3599130A (en) * 1968-07-15 1971-08-10 Terasaki Denki Sangyo Kk Circuit interrupter

Also Published As

Publication number Publication date
EP0233323A3 (en) 1987-09-09
EP0233323A2 (fr) 1987-08-26

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