EP0358289B1 - Agencement de contacts mobiles avec écran - Google Patents

Agencement de contacts mobiles avec écran Download PDF

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Publication number
EP0358289B1
EP0358289B1 EP89250029A EP89250029A EP0358289B1 EP 0358289 B1 EP0358289 B1 EP 0358289B1 EP 89250029 A EP89250029 A EP 89250029A EP 89250029 A EP89250029 A EP 89250029A EP 0358289 B1 EP0358289 B1 EP 0358289B1
Authority
EP
European Patent Office
Prior art keywords
contact
partitions
levers
shielding part
contact arrangement
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
EP89250029A
Other languages
German (de)
English (en)
Other versions
EP0358289A2 (fr
EP0358289A3 (fr
Inventor
Clifford A. Buxton
David A. Leone
Don Quinton
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 EP0358289A2 publication Critical patent/EP0358289A2/fr
Publication of EP0358289A3 publication Critical patent/EP0358289A3/fr
Application granted granted Critical
Publication of EP0358289B1 publication Critical patent/EP0358289B1/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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/62—Heating or cooling of contacts
    • 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
    • H01H2001/228—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 with insulating spacers between the 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
    • H01H9/302—Means for extinguishing or preventing arc between current-carrying parts wherein arc-extinguishing gas is evolved from stationary parts

Definitions

  • the invention relates to a movable contact arrangement for a low-voltage circuit breaker with a plurality of contact levers arranged in parallel, which can be pivoted about an articulation, and with movable contact pieces attached to the latter, which interact with stationary contact pieces, and with an insulating partition for the shielding body having the contact lever.
  • a contact arrangement of this type is known from US-A-4,672,157.
  • the purpose of arranging a plurality of contact levers in parallel is to distribute high currents over a number of contact transition points.
  • the partitions of the shielding body help to ensure the uniform distribution of the total current despite the small distance between the adjacent contact levers.
  • the object of the invention is to increase the resilience of such a contact arrangement by means of improved cooling. Furthermore, the dwell of switching arcs on the contacts should be restricted as far as possible in order to counteract wear of the contacts and thus an increase in the contact resistance.
  • a receiving area delimited by wall parts can also be provided for the engagement of a drive device serving to pivot the contact lever. This arrangement permits the coupling of the drive device while largely maintaining the gaps between the contact levers created for cooling.
  • the shielding body may have alternatingly continuous partition walls and partition walls provided with projections and for at least two of the partition walls provided with projections additionally to have a receiving area.
  • one side surface of each contact lever is adjacent to one of the gaps created.
  • the shielding body On its side covering the underside of the contact levers, the shielding body can have an angled gas-emitting protective web and an additional transverse web extending at a distance from the underside of the contact levers, directly after the movable contact pieces. Gases are released from the protective web when heated by the arcs that occur on the contact pieces during switching. The gas formation causes the arcs to be driven away by the contacts and the contact pieces are therefore only exposed to the arc for a short time. This helps to reduce the wear of the contact pieces and to keep the contact resistance between the contact pieces low. As a result, the heating of the entire contact arrangement is less during operation. Characterized in that there is a transverse web arranged at a distance from the underside of the contact lever on the protective web of the shielding body, the entry of the air into the spaces between the contact levers is facilitated. This improves the cooling effect.
  • FIG. 1 is a side view of a contact arrangement with a plurality of contact levers arranged in parallel and with a shielding body.
  • FIG. 2 shows a top view of the contact arrangement according to FIG. 1.
  • Figures 3 and 4 show a shielding body in a plan view and in a side view.
  • the contact arrangement shown in FIG. 1 and designated as a whole by 2 is part of a circuit breaker, for example a low-voltage circuit breaker of compact design with a molded-plastic housing (MCCB).
  • the contact arrangement 2 is opened and closed by touching and separating contact pieces 10 and 12, of which several pairs are provided, in order to limit the stress on each individual pair of contact pieces 10 and 12 to a certain extent.
  • the contact arrangement 2 comprises a current-transmitting joint arrangement 16 with a pivot axis 4 and a number of contact levers 18, each of which is provided with a contact piece 10.
  • the contact pieces 10 can be brought into contact with the fixed contact pieces 12, which are attached to a further fixed connecting rail 6, by pivoting the contact lever 18 about the pivot axis 4 in the clockwise direction.
  • the parallel arrangement of the contact levers 18 can be seen in FIG. 2.
  • the shielding body 20 is a molded plastic part with partitions 26 and 28.
  • the partitions 26 are flat, so that the contact lever 18 abut them directly.
  • the partition walls 28, on the other hand, are provided with projections 22 in such a way that spaces 30 are created between the adjacent contact levers 18 and the partition wall 28 located therebetween, through which air can flow.
  • Two of the partitions 28 also have receiving areas 24 delimited by wall parts, which are provided for the engagement of drive parts of a drive device in order to pivot the contact levers 18 for switching on and off.
  • the side view of the shielding body 20 can be seen that on the underside of the shielding body 20 there is a transverse web 32, which extends over all the contact levers 18 and extends at a distance from the underside of the contact lever 18, and another, the contact pieces 12 adjacent gas-emitting protective web 34 is provided.
  • the protective web 32 abuts in part on the underside 36 of the contact lever 18 and supports it in such a way that it is moved evenly when pivoted.
  • the space between the underside of the contact lever 18 and the crosspiece 32 which can be seen in particular in FIG. 1, facilitates the access of the air into the spaces 30 and thus improves the cooling of the contact arrangement 2.
  • the gas-emitting protective web 34 prevents an arc from running along the lower edge 36 of the contact lever. Furthermore, the emission of gases from the plastic of the shielding body 20 under the influence of arcs at the contacts 10 and 12 causes the arc to be rapidly moved away from the contacts 10 and 12 in the direction of an arcing horn and an arc quenching chamber located upstream thereof.
  • the shielding body 20 can consist of an insulating, heat-resistant and gas-releasing gas under the influence of arcs Material. Such a material is appropriate to ensure the desired strength of the shielding body 20 and also to cause the gas to be emitted when there is strong heating by an arc.
  • the shielding body can be designed so that it can be used with a different number of contact levers.
  • the receiving areas could be given an adapted shape depending on the drive device provided.
  • the spaces provided for the passage of air can be dimensioned in accordance with the desired cooling effect.
  • the crossbar 32 can also be provided with incisions to facilitate air access.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Push-Button Switches (AREA)

Claims (4)

  1. Dispositif de contact (2) mobile pour un disjoncteur basse tension, comportant plusieurs leviers de contact (18) qui sont parallèles et qui peuvent pivoter autour d'une articulation (4), et des pièces de contact (10) mobiles, qui sont montées sur ces leviers et qui coopèrent avec des pièces de contact (12) fixes, ainsi qu'un corps de blindage (20) qui comporte des parois de séparation (26, 28) isolantes pour les leviers de contact (18), caractérisé par le fait qu'au moins une partie des parois de séparation (26, 28) comporte, des deux côtés, des parties saillantes (22) destinées à l'appui local de leviers de contact voisins (18) les uns par rapport aux autres tout en laissant subsister des intervalles intercalaires (30).
  2. Dispositif de contact suivant la revendication 1, caractérisé par le fait qu'au moins une partie des parois de séparation (28) possède une zone de réception (24), qui est délimitée par des éléments de paroi et dans laquelle pénètre un dispositif d'entraînement destiné à faire pivoter les leviers de contact (18).
  3. Dispositif de contact suivant la revendication 2, caractérisé par le fait que le corps de blindage (20) possède alternativement des parois de séparation continûment planes et des parois de séparation (28) pourvues de parties saillantes (22), et qu'au moins deux des parois de séparation (28) munies de parties saillantes (22) possèdent en supplément chacune une zone de réception (24).
  4. Dispositif de contact suivant l'une des revendications précédentes, caractérisé par le fait que le corps de blindage (20) possède, sur sa face recouvrant la face inférieure (36) des leviers de contact (18) et ce dans une position directement adjacente aux pièces de contact (10) mobiles, une barrette de protection coudée (34) de dégagement du gaz, et une autre barrette transversale (32) qui s'étend à une certaine distance de la face inférieure (36) des leviers de contact (18).
EP89250029A 1988-09-08 1989-09-07 Agencement de contacts mobiles avec écran Expired - Lifetime EP0358289B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US242092 1988-09-08
US07/242,092 US4926016A (en) 1988-09-08 1988-09-08 Moving contact blade barrier

Publications (3)

Publication Number Publication Date
EP0358289A2 EP0358289A2 (fr) 1990-03-14
EP0358289A3 EP0358289A3 (fr) 1991-05-15
EP0358289B1 true EP0358289B1 (fr) 1994-11-23

Family

ID=22913422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89250029A Expired - Lifetime EP0358289B1 (fr) 1988-09-08 1989-09-07 Agencement de contacts mobiles avec écran

Country Status (6)

Country Link
US (1) US4926016A (fr)
EP (1) EP0358289B1 (fr)
JP (1) JPH02117025A (fr)
CA (1) CA1330817C (fr)
DE (1) DE58908658D1 (fr)
ES (1) ES2064428T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2694124T3 (es) * 2012-06-11 2018-12-18 Abb Oy Aparato de conmutación de la corriente eléctrica
ES2704598T3 (es) 2012-06-11 2019-03-19 Abb Oy Aparato de conmutación de corriente eléctrica
EP2674953B1 (fr) 2012-06-11 2018-01-24 ABB Oy Appareil de commutation de courant électrique
KR101879338B1 (ko) * 2016-12-05 2018-07-17 엘에스산전 주식회사 기중 차단기

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3560683A (en) * 1968-01-24 1971-02-02 Westinghouse Electric Corp Circuit breaker with improved contact structure
US4137437A (en) * 1977-06-03 1979-01-30 Westinghouse Electric Corp. Circuit breaker having improved movable crossbar and spring holder
FR2484136A1 (fr) * 1980-06-06 1981-12-11 Merlin Gerin Contacts electriques perfectionnes pour disjoncteurs multipolaires a basse tension et procede de fabrication des contacts
FR2583571B1 (fr) * 1985-06-12 1994-02-18 Merlin Et Gerin Disjoncteur basse tension a coupure amelioree.
JPH0755797Y2 (ja) * 1986-09-09 1995-12-20 三菱電機株式会社 回路しや断器

Also Published As

Publication number Publication date
EP0358289A2 (fr) 1990-03-14
CA1330817C (fr) 1994-07-19
JPH02117025A (ja) 1990-05-01
DE58908658D1 (de) 1995-01-05
ES2064428T3 (es) 1995-02-01
EP0358289A3 (fr) 1991-05-15
US4926016A (en) 1990-05-15

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