EP0380012B1 - Système de contact pour un disjoncteur limitant le courant - Google Patents

Système de contact pour un disjoncteur limitant le courant Download PDF

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Publication number
EP0380012B1
EP0380012B1 EP90101176A EP90101176A EP0380012B1 EP 0380012 B1 EP0380012 B1 EP 0380012B1 EP 90101176 A EP90101176 A EP 90101176A EP 90101176 A EP90101176 A EP 90101176A EP 0380012 B1 EP0380012 B1 EP 0380012B1
Authority
EP
European Patent Office
Prior art keywords
current path
switch arm
switching arm
contact system
contact
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
EP90101176A
Other languages
German (de)
English (en)
Other versions
EP0380012A1 (fr
Inventor
Hans Paluschka
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.)
Eaton Industries GmbH
Original Assignee
Kloeckner Moeller GmbH
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 Kloeckner Moeller GmbH filed Critical Kloeckner Moeller GmbH
Publication of EP0380012A1 publication Critical patent/EP0380012A1/fr
Application granted granted Critical
Publication of EP0380012B1 publication Critical patent/EP0380012B1/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
    • H01H77/104—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 with a stable blow-off position

Definitions

  • the invention relates to a contact system for current-limiting circuit breakers according to the preamble of claim 1.
  • one switching arm is connected via a switching shaft to the switch lock of the circuit breaker and is used for operational switching. At the same time, this switching arm can also open dynamically when there is a current load in the short-circuit area before the switching takes place via the switching lock.
  • the second movable switching arm which can also be formed with two or more parallel switching arms, is pivotally mounted on the current path and is held in the switched-on position by one or more compression springs. It is connected to the current path with a strand and, in the event of a short circuit, pivots against the direction of movement of the first switching arm, so that the opening distance and also the opening speed increase when the switching contacts are lifted off due to an additional acceleration.
  • the arc between the contact pieces of the switching arms is additionally lengthened and extinguished more quickly, but the wire for the current supply, especially on the lower switching arm, forms a weak point in that the welding attachment of the wire on low-switching due to the sudden deflections in the event of a short circuit, it is mechanically very stressed and can therefore easily lead to faults.
  • the invention has for its object to provide a contact system according to the preamble of claim 1, in which the second movable switching arm on the current path is designed and arranged so that the contact system in the closed state on the one hand has such a low contact contact resistance that on a flexible power supply in the form of a strand or the like between the pivotable switching arm and the current path can be dispensed with, and that, on the other hand, in the event of a short circuit, the arc is extended even more and is extinguished even more quickly.
  • a particularly advantageous pivot bearing of the movable switching arm results from the feature of claim 2 as well as from the features of claims 3 and 4, which contribute significantly to the free mobility of the switching arm in the event of a short circuit.
  • the feature of claim 5 also ensures that both in the closed normal state and when triggered in the event of a short circuit, a perfect current transfer between the current path and the movable switching arm, either directly between the pivot bearing recesses for the pivot pin of the switching arm on the underside of the fork legs or else when triggered in the event of a short circuit via the two leaf springs, which extend from a fastening point on the underside of the current path on the fork legs and engage under the pivot pins of the movable switching arm with bearing brackets at their free ends, which lie opposite the bearing recesses on the fork legs.
  • the current transfer from the current path to the movable switching arm can be further improved in that the switching arm has stop lugs which are offset in parallel with respect to the pivots towards the free end of the current path and which rest in the switched-on position of the switching arm on the top of the current path and the spring-loaded switching arm Secure together with the pivot in its switch-on position on the current path.
  • a particularly good contact is achieved in that the stop lugs on the movable switching arm in relation to the parallel pivot to the free end of the current path are set back by a distance that only makes up part of the distance between the pivot pin and the front spring support, so that the switching arm in the switched-on position under the pressure of the helical compression spring with both the pivot pin and the two stop lugs in the manner of a two-armed rocker switch with one increased contact pressure on opposite sides of the current path.
  • the second movable switching arm 3 is pivotally mounted in the switch housing 5 on the current path 6 and held by a compression spring 7 in the switched-on position in FIG. 1, that in the event of a short circuit it pivots against the direction of movement of the first switching arm 2, so that the opening distance and the Increase opening speed when lifting switch contacts 2a, 3a due to additional acceleration of the movable lower switching arm 3.
  • the second movable switching arm 3 is held with two pivot pins 8 directed coaxially to the side in open, approximately semi-cylindrical bearing recesses 9 in a pivotable, resilient contact on the underside 10 of the current path 6.
  • the current path 6 is fork-shaped in the region of the movable switching arm with a U-shaped central recess 11, the movable switching arm 3 engaging under the two fork legs 12, 13 of the current path 6 with its two pivot pins 8 directed to the side and by means of two parallel leaf springs 14, 15 the current path 6 is held in contact in the two bearing recesses 9 on the underside of the fork legs 12, 13.
  • the free ends 16, 17 of the fork legs 12, 13 of the current path 6 are in relation to an attachment plane 18 for the leaf springs 14, 15 on the underside of the current path 6 offset in parallel upwards that they then extend from the bottom 19 of the switch housing 5.
  • the bearing recesses 9 for the pivots 8 of the movable switching arm 3 are arranged in the region of the kink between the rising section 12a, 13a and the free ends 16, 17 of the fork legs 12, 13.
  • the two leaf springs 14, 15, which support the movable switching arm 3 on the two pivots 8, extend from the mounting plane 18 on the underside of the current path 6 along the fork legs 12, 13 and have bearing brackets 14a, 15a for the pivots at their free ends 8 of the movable switching arm 3, which lie opposite the bearing recesses 9 on the fork legs 12, 13.
  • the second movable switching arm 3 also has two parallel to the pivot 8 stop lugs 20, which are offset from the free end of the current path 6 so that they rest in the switched-on position of the switching arm 3 of Fig. 1 on the top of the current path 6 and the spring-loaded Secure switching arm 3 together with the pivot pin 8 in its switched-on position on the current path 6.
  • the stop lugs 20 on the movable switching arm 3 are set back by a distance 21 from the parallel two pivots 8 to the free end of the current path 6, which is only part of the distance 22 between the pivots 8 and the front spring support 7, in the present case in an aspect ratio of the lever arms corresponding to the distances 21, 22 of about 1: 3, so that the switching arm 3 in the switched-on position of FIG. 1 under the action of the helical compression spring 7 with both the pivot pin 8 and with the two stop lugs 20 in the manner of a two-armed rocker switch with an increased contact pressure on opposite sides of the current path 6.
  • the stop lugs 20 can have a wedge-shaped tapered or rounded cross-section towards the current path 6, so that they rest with their lower longitudinal sides on the upper side of the fork legs 12, 13 of the current path 6 in the form of a line or strip, and thus perfect contact points for the current transfer from the movable Form switching arm 3 on the current path 6.
  • a stop 23 fixed to the housing is provided on the switch housing 5 below the pivot pins 8 of the movable switching arm 3.
  • the movable switching arm 3 has a stop cap 20 and a part of the switching arm 3 up to its contact piece 3a covering insulating cap 24 (Fig. 4 to 8) made of plastic, which prevents the arc occurring in the event of a short circuit running along the movable lower switching arm 3 .
  • the arc 25 can be supplied particularly favorably to the two switching arms 2, 3 opposite quenching plates, not shown in the drawing, if on the current path 6, as can be seen in FIGS. 1 to 3 in detail, following the U-shaped one Central recess 11 in the extension of the lower movable switching arm 3 at least one arc guide rib 26 is provided, which the movable switching arm 3 can touch in the event of a short circuit, so that the arc 25 jumps over and is additionally lengthened.

Claims (10)

  1. Système de contacts pour interrupteurs de puissance limiteurs de courant comprenant deux bras de commutation mobiles (2, 3) pour chaque phase, dont l'un (2) est associé au verrou de maintien de l'interrupteur de puissance par l'intermédiaire d'une barre de commutation (4) et est destiné aux opérations de commutation d'un côté et, de l'autre côté, s'ouvre de manière dynamique en cas d'une charge de courant dans le domaine du court-circuit, avant que n'intervienne la commutation grâce au verrou de maintien, tandis que le deuxième bras de commutation (3) est monté pivotant sur le chemin du courant (6) et est maintenu en position fermée grâce à un ressort de pression (7) de sorte qu'il pivote à l'encontre de la direction de mouvement du premier bras de commutation (2) en cas de court-circuit, de manière à ce que la distance d'ouverture et la vitesse d'ouverture sont augmentées sous l'effet d'une accélération supplémentaire au moment du relevage des contacts de commutation (2a, 3a), caractérisé en ce que le deuxième bras mobile de commutation (3) est maintenu dans des mortaises de palier (9) ouvertes et à peu près demi-cylindriques par des pivots (8) dirigés de côté de manière coaxiale dans une position touchant le côté inférieur (10) du chemin de courant (6) de manière pivotante et élastique.
  2. Système de contacts selon la revendication 1, caractérisé en ce que le chemin de courant (6) dans la zone du bras de commutation mobile (3) est agencé en forme de fourchette de telle manière que le bras mobile de commutation (3) touche d'en bas les deux bras de fourchette (12, 13) du chemin de courant (6) gâce à ses pivots (8) dirigés de côté, et est maintenu en une position touchant le côté inférieur (10) des bras de fourchette (12, 13) du chemin de courant (6) dans les deux mortaises de palier (9) par deux ressorts à lames parallèles (14, 15).
  3. Système de contacts selon les revendications 1 et 2, caractérisé en ce que les extrémités libres (16, 17) des bras de fourchette (12, 13) du chemin de courant (6) sont déplacées de façon parallèle, par rapport à leur niveau et par rapport à un plan de fixation (18) pour les ressorts à lames (14, 15) sur le côté inférieur du chemin de courant (6) de sorte qu'elles étendent à partir d'une section inclinée et montante (6).
  4. Système de contacts selon les revendications 1 à 3, caractérisé en ce que les deux ressorts à lames (14, 15) s'étendent à partir du plan de fixation (18) du côté inférieur du chemin de courant (6) le long des bras de fourchette (12, 13) et comportent des étriers de palier (14a, 15a) destinés au pivots (8) du bras mobile de commutation (3), étriers qui se trouvent en face des mortaises de palier (9) sur les bras de fourchette (12, 13).
  5. Système de contacts selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le deuxième bras mobile de commutation (3) comporte des butées d'arrêt (20) qui sont parallèles par rapport aux pivots (8) et déplacées vers l'extrémité libre du chemin de courant (6), butées qui se posent, dans la position fermée du bras de commutation (3) sur le côté supérieur du chemin de courant (6) et arrêtent le bras de commutation (3) comandé par ressort avec les pivots (8) dans sa position fermée sur le chemin du courant (6).
  6. Système de contacts selon la revendication 5, caractérisé en ce que les butées d'arrêt (20) sur le bras de commutation mobile (3) sont déplacées en arrière vers l'extrémité libre du chemin de courant (6) par rapport aux deux pivots (8) parallèles à ces butées et par une distance (21) qui ne s'élève qu'à une partie de la distance (22) entre les pivots (8) et le support avant élastique (7), de sorte que le bras de commutation (3) se pose dans la position fermée et sous l'effet du ressort de pression hélicoïdal (7), aussi bien par les pivots (8) que par les deux butées d'arrêt (20), sur des côtés opposés du chemin de courant (6) selon la manière d'une bascule à commutation à deux bras et avec une pression de contact élevée.
  7. Système de contacts selon les revendications 4 et 5, caractérisé en ce que les butées d'arrêt (20) sur le bras de commutation (3) comportent une section diminuée en forme de coin ou arrondie dans la direction du chemin de courant (6), et que leurs côtés longitudinaux inférieurs forment des surfaces de contacts linéaires ou rectangulaires du côté supérieur des bras de fourchette (12, 13) du chemin de courant (6) permettant le passage du courant du bras mobile de commutation (3) au chemin de courant (6).
  8. Système de contacts selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le boîtier de commutation (5) comporte un butoir (23) attaché au boîtier en bas des pivots (8) du bras mobile de commutation (3).
  9. Système de contacts selon l'une quelconque des revendications 1 à 8, caractérisé en ce que le bras mobile de commutation (3) comporte une couverture isolante (24) en matériau synthétique recouvrant une partie du bras de commutation (3) jusqu'à son élément de contact (3a).
  10. Système de contacts selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le chemin de contact (6) comporte au moins une nervure (26) de guidage de l'arc électrique en prolongation du bras mobile de commutation (3) inférieur, et que le bras mobile de commutation (3) peut toucher cette nervure (26) en cas de court-circuit.
EP90101176A 1989-01-23 1990-01-22 Système de contact pour un disjoncteur limitant le courant Expired - Lifetime EP0380012B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3901852 1989-01-23
DE3901852A DE3901852A1 (de) 1989-01-23 1989-01-23 Kontaktsystem fuer strombegrenzende leistungsschalter

Publications (2)

Publication Number Publication Date
EP0380012A1 EP0380012A1 (fr) 1990-08-01
EP0380012B1 true EP0380012B1 (fr) 1994-05-18

Family

ID=6372598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90101176A Expired - Lifetime EP0380012B1 (fr) 1989-01-23 1990-01-22 Système de contact pour un disjoncteur limitant le courant

Country Status (4)

Country Link
EP (1) EP0380012B1 (fr)
AT (1) ATE105971T1 (fr)
DE (2) DE3901852A1 (fr)
ES (1) ES2052979T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017107441A1 (de) 2017-04-06 2018-10-11 Schaltbau Gmbh Schaltgerät mit Kontaktabdeckung

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4337344B4 (de) * 1993-11-02 2005-08-25 Moeller Gmbh Strombegrenzendes Kontaktsystem für Leistungsschalter
DE19530492B4 (de) * 1995-08-18 2005-08-04 Siemens Ag Bewegkontakt mit Schneidenlagerung
DE10218938B4 (de) * 2002-04-19 2004-07-01 Siemens Ag Anordnung zur Lagerung einer Schaltwelle eines elektrischen Schalters und Niederspannungs-Leistungsschalter mit einer Anordnung zur Lagerung der Schaltwelle
DE10239641B3 (de) * 2002-08-29 2004-02-12 Moeller Gmbh Kontaktsystem für einen Niederspannungsschalter
DE10252741B3 (de) * 2002-11-13 2004-02-26 Moeller Gmbh Kontaktsystem für einen Niederspannungsschalter
IN2012DN06311A (fr) * 2010-02-08 2015-09-25 Siemens Ag
CN102376497B (zh) * 2010-08-23 2014-02-26 上海电科电器科技有限公司 塑壳断路器分片式触头结构

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3365561A (en) * 1966-11-21 1968-01-23 Gen Electric Multiple finger type current-carrying contact arm pivot assembly
US3555471A (en) * 1968-02-28 1971-01-12 Vni I Pk I Electr Oapparatov Automatic breaker with coil adjustable to effect current limiting or electrodynamic blowoff compensation
US4259651A (en) * 1978-10-16 1981-03-31 Westinghouse Electric Corp. Current limiting circuit interrupter with improved operating mechanism
US4554427A (en) * 1983-12-19 1985-11-19 Westinghouse Electric Corp. Molded case circuit breaker with movable lower electrical contact

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017107441A1 (de) 2017-04-06 2018-10-11 Schaltbau Gmbh Schaltgerät mit Kontaktabdeckung
WO2018184727A1 (fr) 2017-04-06 2018-10-11 Schaltbau Gmbh Commutateur à couvercle de contact

Also Published As

Publication number Publication date
DE3901852A1 (de) 1990-07-26
ES2052979T3 (es) 1994-07-16
EP0380012A1 (fr) 1990-08-01
DE59005697D1 (de) 1994-06-23
ATE105971T1 (de) 1994-06-15

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