EP0410902B1 - Niederspannungs-Hochstromschalter mit Mehrfachkontakten - Google Patents

Niederspannungs-Hochstromschalter mit Mehrfachkontakten Download PDF

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Publication number
EP0410902B1
EP0410902B1 EP90420333A EP90420333A EP0410902B1 EP 0410902 B1 EP0410902 B1 EP 0410902B1 EP 90420333 A EP90420333 A EP 90420333A EP 90420333 A EP90420333 A EP 90420333A EP 0410902 B1 EP0410902 B1 EP 0410902B1
Authority
EP
European Patent Office
Prior art keywords
contact
arcing
stationary
circuit breaker
arc
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
EP90420333A
Other languages
English (en)
French (fr)
Other versions
EP0410902A1 (de
Inventor
Robert Morel
Marc Rival
Hubert Garcia
Pierre Miguet
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.)
Schneider Electric Industries SAS
Original Assignee
Merlin Gerin SA
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34750813&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0410902(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Merlin Gerin SA filed Critical Merlin Gerin SA
Publication of EP0410902A1 publication Critical patent/EP0410902A1/de
Application granted granted Critical
Publication of EP0410902B1 publication Critical patent/EP0410902B1/de
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
    • H01H9/38—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H9/383—Arcing contact pivots relative to the movable contact assembly
    • 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
    • H01H9/46—Means for extinguishing or preventing arc between current-carrying parts using arcing horns
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/226—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member having a plurality of parallel contact bars
    • 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
    • H01H2009/305—Means for extinguishing or preventing arc between current-carrying parts including means for screening for arc gases as protection of mechanism against hot arc gases or for keeping arc gases in the arc chamber
    • 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

Definitions

  • a known circuit breaker of the kind mentioned is described in documents EP-A-206 882 and FR-A-2,589,624, which allow breaking of short-circuit currents of very high intensities.
  • the arc is prevented from returning to the arc formation zone by virtue of the presence of the rim on the fixed arc guide horn.
  • Separable contacts act as both main contacts and arcing contacts. Tests have shown a certain stagnation of the arc causing premature erosion of the contacts depending on the type of fault, especially in the presence of direct currents.
  • the central contact finger exclusively carries the movable arcing contact, and has a length greater than that of the juxtaposed contact fingers supporting the movable main contacts.
  • the arcing contacts are permanently closed in the closed position of the circuit breaker.
  • the arrangement of two types of contact fingers complicates the production of each pole of the circuit breaker.
  • a tilting movable contact finger comprises an arcing contact and a main contact cooperating with a fixed contact part.
  • the main contacts close after and open before the arcing contacts.
  • Such a circuit breaker has limited electrical endurance given the distance of the arcing contacts from the extinguishing chamber.
  • the object of the invention is to improve the electrical endurance of a low voltage circuit breaker with high currents.
  • Presence of arcing contacts prevents erosion of main contacts, while bringing the arc closer to the rim accelerates arc migration along the guide horn, and reduces erosion of arcing contacts. This results in better electrical endurance of the circuit breaker, regardless of the type of fault, and the nature of the current.
  • the thermal action of the arc on the side walls of the insulating housing can be avoided when the fixed arcing contact is arranged to center the arc relative to the median plane of the pole.
  • the fixed main contact and the fixed arcing contact consist of two parallel plates extending transversely with respect to the contact fingers, the plate of the fixed arcing contact being shorter than that of the fixed main contact.
  • the contact fingers are pivotally mounted on a first transverse axis inside a support cage, and the cage of insulating material can switch between the open positions and closing around a second articulation axis by the action of the mechanism, the assembly being arranged to cause reverse rotational movements of the cage and the contact fingers when the arcing contacts are closed.
  • a pole 10 of a low-voltage, high-intensity non-limiting circuit breaker in particular greater than 1000 A, is housed in a compartment 12 of a molded insulating case 14, containing a separable contact device 16 , and an arc extinguishing chamber 18.
  • a pole 10 of a low-voltage, high-intensity non-limiting circuit breaker in particular greater than 1000 A, is housed in a compartment 12 of a molded insulating case 14, containing a separable contact device 16 , and an arc extinguishing chamber 18.
  • the structure of such a pole is described in detail in the aforementioned French patent FR-A-2,589,624.
  • the arc extinguishing chamber 18 is equipped with a stack of metal sheets, framed by a pair of lower 20 and upper 22 arc conductive horns.
  • the fixed arc horn 20 is made of steel and extends between a conductive part 23 attached to the pad 26 and the chamber 18 of which it constitutes one of the end sheets.
  • the separable contact device 16 comprises a fixed main contact 24 carried directly by a first connection pad 26 passing through the base of the insulating housing 14.
  • the lower arc horn 20 is fixed to the part 23 of the pad 26 and to the base of the housing 14 by fixing means 28, 30.
  • the movable contact assembly 32 is provided with a plurality of contact fingers 34 in parallel pivotally mounted on a first transverse axis 36 inside a support cage 38 of insulating material. All the contact fingers 34 have an identical length.
  • the fixed main contact 24 extends transversely to all of the contact fingers 34 in a direction parallel to the first axis 36.
  • each contact finger 34 is connected by a flexible conductor, in particular a braid 40 to a second connection pad 42 which crosses the base of the housing 14 extending parallel to the first pad 26.
  • the cage 38 is coupled to the switching bar of the mechanism (not shown) by a transmission link 44.
  • the internal portion of the second area 42 is surrounded by a current sensor 46 electrically connected to the trigger of the mechanism.
  • the end of the cage 38 located above the second range 42 is equipped with a second axis 48 housed in a fixed bearing 50, to allow the pivoting of the cage 38 following the rotation of the bar between the positions of opening and closing of the pole 10.
  • a spring device 52 for contact pressure is positioned in a notch 54 of the cage 38, and biases the contact fingers 34 in pivoting around the first axis 36 anticlockwise.
  • Each contact finger 34 is provided with a contact piece, hereinafter called mobile main contact 56 cooperating in the closed position with the fixed main contact 24.
  • the first transverse pin 36 is located between the mobile main contacts 56 and the braids 40.
  • each contact finger 34 has a front extension 58 projecting from the cage 38, and capable of moving along a rim 60 or boss of the lower bow horn. 20.
  • each contact finger 34 is shaped as an arc horn having a movable arcing contact 62 intended to cooperate with a fixed arcing contact 64 located near the rim 60 of the arcing horn 20.
  • the fixed arcing contact 64 is fixed on the intermediate piece 23, and is in electrical connection with the horn 20, and the pad 26, being arranged between the flange 60 and the fixed main contact 24 .
  • the width of the fixed arcing contact 64 is less than that of the plate of the fixed main contact 24. This results in an absence of contact of the movable arcing contacts 62 of the fingers 34 of the ends with the fixed arcing contact 64 (see fig. 4) when opening the pole.
  • pole 10 The operation of pole 10 is as follows:
  • the link 44 acts on the cage 38 in the direction of the arrow F, (fig.3), simultaneously causing the cage 38 to tilt clockwise around the second axis 48, and the reverse pivoting of the contact fingers 34 around the first axis 36.
  • the fugitive closing of the arcing contacts 62, 64 takes place before the separation of the main contacts 24, 56, which takes place without an arc. In this intermediate position, all the current then passes through the arcing contacts 62, 64 thanks to this temporary contact zone located very close to the rim 60 of the horn 20.
  • the presence of the arcing contacts 62, 64 prevents the erosion of the main contacts 24, 56.
  • the bringing together of the arcing at the rim 60 accelerates the migration of the arcing along the guide horn 20, and improves then the development of the arc towards the chamber 18 with a view to rapid extinction.
  • the arrangement of the flange 60 in the vicinity of the arcing zone and along the direction of movement of the contact fingers 34 reduces the erosion of the arcing contacts 62, 64, and contributes to reducing the travel time. from the arch to chamber 18.
  • the narrowed dimensioning in length of the conductive plate constituting the common fixed arcing contact 64 makes it possible to obtain a centering of the arc relative to the median plane of the chamber 18, in order to save wear on the side walls of the housing 14 insulator due to the thermal action of the arc. This results in a significant improvement in the electrical endurance of the non-limiting circuit breaker, which is capable of interrupting any type of current, in particular short-circuit alternating currents, or direct currents of low intensity.
  • the fixed arcing contact 64 could be fixed directly on the arcing horn 10.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Breakers (AREA)

Claims (5)

  1. Niederspannungs Leistungsschalter mit Mehrfachkontakt für hohe Nennströme, der in einem Isolierstoffgehäuse (14) installiert ist und pro Pol
    - mehrere bewegliche Kontaktfinger (34) gleicher Länge, die in geringem relativem Abstand parallel zueinander angeordnet sind und durch einen Schaltmechanismus zwischen einer Einschaltstellung und einer Ausschaltstellung hin und herbewegt werden können,
    - einen feststehenden Hauptkontakt (24), der in der Einschaltstellung mit einem beweglichen Hauptkontakt (56) jedes einzelnen Kontaktfingers (34) zusammenwirkt,
    - zwei Anschlüssen (26, 42), die elektrisch mit dem feststehenden Hauptkontakt (24) sowie mit den Kontaktfingern (34) verbunden sind,
    - sowie eine Lichtbogenlöschkammer (18) mit einem Löschblechpaket zur Entionisierung umfaßt, die von zwei zur Lichtbogenführung und -wanderung dienenden, leitenden Lichtbogenhörnern (20, 22) begrenzt wird, wobei eines (20) der ortsfesten Lichtbogenhörner elektrisch mit dem feststehenden Hauptkontakt (24) verbunden ist und einen Zwischenabsatz (60) aufweist, der sich über eine kurze Entfernung in der Verschiebungsrichtung der frontseitigen Verlängerungen (58) der Kontaktfinger (34) erstreckt, um die Längung des Lichtbogens in der ersten Phase der Kontakttrennung zu begrenzen,
    dadurch gekennzeichnet, daß der Leistungsschalter darüber hinaus
    - einen feststehenden Lichtbogenkontakt (64), der in dem Raum zwischen dem Zwischenabsatz (60) des Lichtbogenhorns (20) und dem feststehenden Hauptkontakt (24) angeordnet ist, wobei der Abstand des genannten feststehenden Lichtbogenkontakts (64) zu dem Absatz (60) geringer ist als zu dem feststehenden Hauptkontakt (24),
    - einen beweglichen Lichtbogenkontakt (62), der zwischen dem Ende mindestens eines Kontaktfingers (34) und dem beweglichen Hauptkontakt (56) angeordnet ist,
    - sowie Mittel zum Schließen der Lichtbogenkontakte (62, 64) zu Beginn des Öffnungshubs der Kontaktfinger (34) und vor der Trennung der Hauptkontakte (24, 56) umfaßt.
  2. Leistungsschalter mit Mehrfachkontakt nach Anspruch 1, dadurch gekennzeichnet, daß der Lichtbogen durch entsprechende Ausführung des feststehenden Lichtbogenkontakts (64) in Bezug auf die Mittelachse des Pols zentriert wird.
  3. Leistungsschalter mit Mehrfachkontakt nach Anspruch 2, dadurch gekennzeichnet, daß das mit dem Absatz (60) versehene ortsfeste Lichtbogenhorn (20) aus Stahl besteht und daß der feststehende Hauptkontakt (24) und der feststehende Lichtbogenkontakt (64) als zwei parallel zueinander liegende und quer zu den Kontaktfingern (34) angeordnete Plättchen ausgeführt sind, wobei das Plättchen des feststehenden Lichtbogenkontakts (64) kürzer ist als das Plättchen des feststehenden Hauptkontakts (24).
  4. Leistungsschalter mit Mehrfachkontakt nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Kontaktfinger (34) im Innern eines Kontaktträgerkäfigs (38) schwenkbar auf einer ersten Querachse (36) gelagert sind und daß der genannte Isolierstoff-Kontaktträger käfig (38) durch Einwirkung des Schaltmechanismus' zwischen der Einschaltstellung und der Ausschaltstellung eine Kippbewegung um eine zweite Gelenkachse (48) ausführen kann, wobei die gesamte Einheit so ausgeführt ist, daß beim Schließen der Lichtbogenkontakte (62, 64) jeweils entgegengesetzte Drehbewegungen des Kontaktträgerkäfigs (38) einerseits und der Kontaktfinger (34) andererseits erzeugt werden.
  5. Leistungsschalter mit Mehrfachkontakt nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß der feststehende Lichtbogenkontakt (64) an einem zwischen dem Lichtbogenhorn (20) und dem Anschluß (26) eingefügten Leiterstück (23) befestigt ist, auf dem der feststehende Hauptkontakt (24) angeordnet ist.
EP90420333A 1989-07-26 1990-07-12 Niederspannungs-Hochstromschalter mit Mehrfachkontakten Expired - Lifetime EP0410902B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR8910175A FR2650434B1 (fr) 1989-07-26 1989-07-26 Disjoncteur basse tension a contacts multiples et a fortes intensites
FR8910175 1989-07-26
CA002053516A CA2053516C (en) 1989-07-26 1991-10-16 Low voltage circuit breaker with multiple contacts for high currents

Publications (2)

Publication Number Publication Date
EP0410902A1 EP0410902A1 (de) 1991-01-30
EP0410902B1 true EP0410902B1 (de) 1995-02-15

Family

ID=34750813

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90420333A Expired - Lifetime EP0410902B1 (de) 1989-07-26 1990-07-12 Niederspannungs-Hochstromschalter mit Mehrfachkontakten

Country Status (7)

Country Link
US (1) US5210385A (de)
EP (1) EP0410902B1 (de)
CA (1) CA2053516C (de)
DE (1) DE69016869T2 (de)
ES (1) ES2071066T3 (de)
FR (1) FR2650434B1 (de)
HK (1) HK1006892A1 (de)

Cited By (4)

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DE19932010C1 (de) * 1999-07-02 2001-03-08 Siemens Ag Schaltkontaktanordnung eines Niederspannungs-Leistungschalters mit Hauptkontakten, Zwischenkontakten und Abreißkontakten
DE19957259A1 (de) * 1999-11-19 2001-06-13 Siemens Ag Schaltkontaktanordnung mit einer feststehenden Baugruppe aus Vorkontakt und Lichtbogenhorn
DE10114745A1 (de) * 2001-03-20 2003-01-30 Siemens Ag Kontaktträger für Niederspannungs-Leistungsschalter
EP3236482A1 (de) 2016-04-21 2017-10-25 Schneider Electric Industries SAS Schutzschalter mit unterbrechung in der luft, der eine kammer mit verbesserter lichtbogenunterbrechung umfasst

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US5210385A (en) 1993-05-11
CA2053516C (en) 2002-08-20
DE69016869T2 (de) 1995-09-07
DE69016869D1 (de) 1995-03-23
FR2650434A1 (fr) 1991-02-01
FR2650434B1 (fr) 1995-11-24
HK1006892A1 (en) 1999-03-19
CA2053516A1 (en) 1993-04-17
ES2071066T3 (es) 1995-06-16
EP0410902A1 (de) 1991-01-30

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