EP0358288B1 - Agencement de contact pour un disjoncteur de puissance avec contacts auxiliaires et contacts principaux - Google Patents

Agencement de contact pour un disjoncteur de puissance avec contacts auxiliaires et contacts principaux Download PDF

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Publication number
EP0358288B1
EP0358288B1 EP89250028A EP89250028A EP0358288B1 EP 0358288 B1 EP0358288 B1 EP 0358288B1 EP 89250028 A EP89250028 A EP 89250028A EP 89250028 A EP89250028 A EP 89250028A EP 0358288 B1 EP0358288 B1 EP 0358288B1
Authority
EP
European Patent Office
Prior art keywords
contact
main contacts
contacts
contact lever
current
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
EP89250028A
Other languages
German (de)
English (en)
Other versions
EP0358288A2 (fr
EP0358288A3 (fr
Inventor
Clifford A. Buxton
David A. Leone
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0358288A2 publication Critical patent/EP0358288A2/fr
Publication of EP0358288A3 publication Critical patent/EP0358288A3/fr
Application granted granted Critical
Publication of EP0358288B1 publication Critical patent/EP0358288B1/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
    • 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
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet

Definitions

  • the invention relates to a contact arrangement for a circuit breaker with fixed main contacts and a pre-contact and with a pivotally mounted relative to these contacts, also having main contacts and a pre-contact contact lever and with a device for accelerated transfer occurring at the main contacts switching arcs to the pre-contacts, the contact lever has a recess on its contacting underside, facing away from the pre-contact, at a first distance from the main contacts and on its opposite top side at a second, greater distance from the main contacts.
  • a contact arrangement of this type is known from EP-A-0 206 882.
  • the device for accelerated transfer of switching arcs to the pre-contacts comprises a special design of the path of the switching arcs in such a way that a fixed arcing horn has a bend pointing in the direction of the contact movement.
  • a zone with a small opening width is hereby formed in order to avoid the risk of reignition.
  • the arcing horns form diverging paths that start from the contacts and encourage the switching arcs to migrate with increasing length.
  • the invention has for its object to effect the transfer of the switching arcs from the main contacts to the pre-contacts in a simpler manner and in particular without additional parts.
  • the depressions have a rounded contour on their bottom and that the depression provided on the contact-making underside of the contact lever is arranged immediately afterwards on the main contacts located there, the distance between the depressions being such that in one Area of the contact lever is opposite to the direction of the current, forming a current loop.
  • This design leads to such a course of the current path within the contact lever that the current threads undergo a loop-shaped deflection and thereby directly generate an electrodynamic propulsive force which drives an arc which arises at the main contacts in the direction of the preliminary contacts. In this way, a dwelling of such a switching arc at the main contacts and thus an undesired stress on the main contacts important for the permanent load is avoided. Since the burn-up is thus kept as low as possible, erosion and a concomitant increase in contact resistance and heating during operation are avoided. By rounding the depressions, an adverse influence on the strength of the contact lever is avoided.
  • a major advantage of the contact arrangement according to the invention is that the device for driving the switching arcs on the main contacts is an integral part of the contact lever and is in the immediate vicinity of the main contacts.
  • the contact arrangement shown in the figure can be, for example, the part of the current path of a compact low-voltage circuit breaker with an insulating housing (MCCB).
  • the current path comprises a stationary connecting rail 10 with a current-transmitting joint arrangement 12, to which a joint region 14 with a circular contour belongs at the end of a contact lever 18 pivotably mounted about a pivot axis 16.
  • the contact lever 18 is provided with a plurality of main contacts arranged parallel to one another and with an arcing horn 22 and a pre-contact 24 attached to it.
  • a further fixed connecting rail 26 is arranged, which carries fixed main contacts 28 and a fixed pre-contact 30.
  • the contact lever 18 ensures that such switching arcs are transferred as quickly as possible to the pre-contacts 24 and 30, from which they are known in a known manner via arcing horns get into an extinguishing chamber.
  • the contact lever 18 has a depression 32 on its contacting underside immediately following the area of the main contacts 20.
  • a further depression 34 is arranged at a distance from this on the opposite upper side of the contact lever 18, which depression is formed by the kink.
  • the current flowing through the contact lever 18 through the recesses 32 and 34 is caused to loop in such a way that current threads flow locally in parallel planes 38 and 40 which extend on both sides of the recess 32.
  • the plane 40 runs approximately through the axes of the main contacts 20 and 28.
  • areas 42 and 44 arise in the planes 38 and 40 due to the deflection of the current filaments, in which the direction of the current is opposite.
  • the current loop formed in this way tends to expand in the direction of the pre-contacts 24 and 30 and thus quickly transfer the switching arcs ignited at the main contacts 20 and 28 to the pre-contacts 24 and 30 and the subsequent arcing horn 22 located at the end of the contact lever 18.
  • the effect of the current loop can be made stronger or weaker. If, for example, the depression 34 is designed as a kink or offset according to the drawn-out contour of the contact lever 18, then the loop effect is less than with a further-reaching depression approximately corresponding to the dashed contours 46 and 48.
  • the areas 42 and 44 in the course of the current path 36, which are traversed by the current antiparallel, have different lengths depending on the design of the recess 32 and therefore result in a more or less pronounced loop effect.
  • the depressions have a rounded contour.
  • the strength of the contact lever 18 is influenced as little as possible.

Landscapes

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

Claims (1)

  1. Dispositif de contact pour un disjoncteur comportant des contacts principaux fixes (28) et un contact auxiliaire (30) ainsi qu'un levier de contact (18) monté de manière à pouvoir pivoter par rapport à ces contacts (28, 20) et possédant également des contacts principaux (20) et un contact auxiliaire (24), et un dispositif pour le déplacement accéléré d'arcs électriques de coupure, qui apparaissent au niveau des contacts principaux, en direction des contacts auxiliaires (24,20), le levier de contact (18) possédant, au niveau de sa face inférieure établissant le contact et tournée à l'opposé du contact auxiliaire (24), à une première distance des contacts principaux (20), un renfoncement (32) et, au niveau de sa face supérieure opposée, à une seconde distance supérieure des contacts principaux, un second renfoncement (34),
    caractérisé par le fait que les renfoncements (32,34) possèdent, au niveau de leurs fonds, un contour arrondi et que le renfoncement (32), qui est prévu au niveau de la face inférieure, qui établit le contact, du levier de contact (18), est disposé en position directement adjacente aux contacts principaux (20) situés en cet endroit, la distance entre les renfoncements (32,34) étant dimensionnée de telle sorte que dans une partie du levier de contact (18), le courant est dirigé en sens opposé, avec formation d'une boucle de courant.
EP89250028A 1988-09-08 1989-09-07 Agencement de contact pour un disjoncteur de puissance avec contacts auxiliaires et contacts principaux Expired - Lifetime EP0358288B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/242,094 US4926018A (en) 1988-09-08 1988-09-08 Moving mains arc movement loop
US242094 2002-09-12

Publications (3)

Publication Number Publication Date
EP0358288A2 EP0358288A2 (fr) 1990-03-14
EP0358288A3 EP0358288A3 (fr) 1991-01-02
EP0358288B1 true EP0358288B1 (fr) 1995-03-08

Family

ID=22913430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89250028A Expired - Lifetime EP0358288B1 (fr) 1988-09-08 1989-09-07 Agencement de contact pour un disjoncteur de puissance avec contacts auxiliaires et contacts principaux

Country Status (5)

Country Link
US (1) US4926018A (fr)
EP (1) EP0358288B1 (fr)
JP (1) JPH02117022A (fr)
CA (1) CA1333183C (fr)
DE (1) DE58909080D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3579261A1 (fr) * 2018-06-08 2019-12-11 ABB Schweiz AG Disjoncteur haute tension
US10879023B1 (en) * 2019-06-12 2020-12-29 Landis+Gyr Innovations, Inc. Progressively contacting switch

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL181660B (nl) * 1952-10-21 Ici Ltd Werkwijze voor de bereiding van een door copolymerisatie hardbare vormmassa.
FR1080198A (fr) * 1953-06-16 1954-12-07 Merlin Gerin Nouveaux dispositifs de contacts électriques
US3192344A (en) * 1961-08-28 1965-06-29 Fed Pacific Electric Co High interrupting capacity circuit breakers with electrodynamic latch release
US3345485A (en) * 1964-12-30 1967-10-03 Fed Pacific Electric Co Circuit breaker having improved arcing contact structure
CH470065A (de) * 1966-11-16 1969-03-15 Licentia Gmbh Leistungsschalter, bei dem die Kontaktgabe durch zwei parallele Konstakstellen erfolgt
US3585329A (en) * 1968-01-24 1971-06-15 Westinghouse Electric Corp Circuit interrupter with improved contact structure and arc-runner
US3749867A (en) * 1971-04-01 1973-07-31 Westinghouse Electric Corp Spaced-metallic-plate-type of arc-chute for a switch
JPS6147035A (ja) * 1984-08-10 1986-03-07 富士電機株式会社 回路遮断器の接触子構造
FR2583571B1 (fr) * 1985-06-12 1994-02-18 Merlin Et Gerin Disjoncteur basse tension a coupure amelioree.
DE3539673A1 (de) * 1985-11-06 1987-05-07 Siemens Ag Kontaktanordnung fuer niederspannungs-leistungsschalter mit hauptkontakten und abbrennkontakten

Also Published As

Publication number Publication date
EP0358288A2 (fr) 1990-03-14
EP0358288A3 (fr) 1991-01-02
CA1333183C (fr) 1994-11-22
JPH02117022A (ja) 1990-05-01
US4926018A (en) 1990-05-15
DE58909080D1 (de) 1995-04-13

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