EP0222684B1 - Montage de contacts pour interrupteur à charge à basse tension avec des contacts principaux et des contacts d'amorçage d'arc - Google Patents

Montage de contacts pour interrupteur à charge à basse tension avec des contacts principaux et des contacts d'amorçage d'arc Download PDF

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Publication number
EP0222684B1
EP0222684B1 EP86730160A EP86730160A EP0222684B1 EP 0222684 B1 EP0222684 B1 EP 0222684B1 EP 86730160 A EP86730160 A EP 86730160A EP 86730160 A EP86730160 A EP 86730160A EP 0222684 B1 EP0222684 B1 EP 0222684B1
Authority
EP
European Patent Office
Prior art keywords
arc
contact
arcing
contact arrangement
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
EP86730160A
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German (de)
English (en)
Other versions
EP0222684A1 (fr
Inventor
Bernd Dipl.-Ing. Adam
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 EP0222684A1 publication Critical patent/EP0222684A1/fr
Application granted granted Critical
Publication of EP0222684B1 publication Critical patent/EP0222684B1/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
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H01H9/446—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using magnetisable elements associated with the contacts
    • 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

Definitions

  • the invention relates to a contact arrangement for low-voltage circuit breakers with main contacts for guiding a continuous current and with burn-off contacts for igniting a switching arc in the entry area of an arc quenching chamber, and with arcing horns for transferring the switching arc into the arc quenching chamber, with at least two main contact contact piece supports being arranged next to one another and at least one burn-off contact piece support is arranged at a distance therefrom.
  • a contact arrangement of this type is known for example from DE-A-2 218 420.
  • Such contact arrangements are usually selected in order to be able to transmit a high current over a longer period of time with the contact arrangement being heated as little as possible. In principle, this is achieved in that the main contacts operate without arcing and are consequently not exposed to erosion which affects the contact surfaces. If such a contact arrangement is opened for switching off, then the currents initially flowing through the main contacts are commutated to the burn-off contacts, so that only the switching arc is applied to them.
  • the object of the invention is to provide such a configuration of the contact arrangement which allows a relatively narrow, i.e. to be able to use the arc extinguishing chamber which is essentially matched to the burn-off contacts even if an arcing is to be expected at the main contacts.
  • an arc guide made of a ferromagnetic material is arranged in the space between the main contact contact piece supports and the burn-off contact piece contact piece.
  • the effect of the arc guide piece is based on the known phenomenon that arcs are attracted by ferromagnetic parts and can thus be guided in a desired direction (see e.g. DE-A-1 690 137).
  • the proposed arc guiding pieces attract and take over partial arcs occurring in the event of an overload at the main contacts. Based on known commutation processes, they then reach, for example, the burn-off contact or the arcing horns and combine at these parts to form a uniform switching arc. Since only this is to be transferred into the arc quenching chamber, it is sufficient to adapt the dimensions of the arc quenching chamber to the burnout contacts. As a result of its smaller volume, the arc quenching chamber can be manufactured more cheaply than the known design with widened quenching plates.
  • the arc guiding pieces For the transfer of the partial arcs from the main contacts to the burn-off contact, it has proven to be advantageous to carry out the arc guiding pieces with an approximately triangular shape, one side of the triangular shape in each case the main contacts and another side the space between the upper edge of the main contacts and the upper edge of the associated burnout contact covered. In this way, effective guiding edges for the partial arcs are formed.
  • two edges of the triangular shape can be arranged so that they are at an acute angle, which leads to the arcing horn of the associated break contact. In this way it can be achieved that the partial arcs only meet the main arc at the arcing horn and the additional stress on the burnout contacts is avoided.
  • the arc guide pieces provided according to the invention can be stamped and bent parts made of sheet steel, or they can be ferromagnetic castings. It has been found that the mass of the arc guide pieces, i.e. for a given area their thickness has an influence on the desired effect. Depending on the desired effect, it may therefore be advisable to use arc guiding pieces that are more or less thick. When it is designed as a cast part, it proves to be advantageous to provide a thick-walled part for guiding arcs and a thin-walled part for fastening.
  • both the fixed part and the movable part of the contact arrangement can be provided with arcing elements, or both parts of the contact arrangement can be arcing elements. It has been shown that a suitable effect can already be achieved by appropriate equipping of the fixed part. The invention is explained in more detail below with reference to the exemplary embodiments shown in the figures.
  • Figure 1 shows the contact arrangement of a Po. les of a low voltage circuit breaker in a partially sectioned side view.
  • FIG. 2 shows the section 11-11 in FIG. 1, the left and right parts of FIG. 2 showing different embodiments.
  • the contact arrangement 1 according to FIGS. 1 and 2 comprises, in a known manner, a fixed part 2 and a movable part 3.
  • An insulating block 4 serves as a support for the fixed part 2 of the contact arrangement 1, to which an upper connecting bar 5 is attached, which is also a fixed part Main contact is used and for this purpose is provided with a contact piece support 6 or a larger number of such contact piece supports.
  • a fixed burn-off contact 7 is fastened close to the contact piece support 6, which is also provided with a contact piece support 10.
  • the current band 12 establishes the electrically conductive connection with the movable part 3 of the contact arrangement 1, which is pivotably mounted about a hinge pin 13 arranged between the legs of the U-shaped current band 12.
  • the movable part 3 comprises a carrier 14 on which the main contact lever 16, which is connected to the current band 12, is pivotably mounted about a hinge pin 15. These are provided at their upper end with contact piece supports 17 which cooperate with the fixed contact piece supports 6.
  • the carrier 14 has a burn-off contact 20 which has a contact piece support 21 which interacts with the fixed contact piece support 10.
  • Both the stationary part 2 and the movable part 3 of the contact arrangement 1 have an arcing horn 22 or 23 in order to convert switching arcs into an arcing chamber 24.
  • FIG. 2 shows, there are two fixed contact piece supports 6 as main contacts. Accordingly, the movable part 3 of the contact arrangement 1 has two contact levers arranged next to one another with contact piece supports 17. Depending on the current that the circuit breaker should be able to handle with permissible heating, a larger number of main contacts can be provided. In order to illustrate this, two contact piece supports 6 are shown in the right part of FIG. 2, so that in this embodiment the contact arrangement has a total of four main contacts.
  • the movable part of the contact arrangement 1 is connected in an articulated manner to the carrier 14 by means of a suitable type of drive device, not shown, via an insulating coupling 25 by means of a bolt 26.
  • the contact arrangement 1 is closed by moving the isolating coupling 25 in the direction of the arrow 27, the contact piece supports 10 and 21 of the burn-off contacts first and then the contact piece supports 6 and 17 of the main contacts coming into contact with one another.
  • the bearing pin 26 acts as a fixed pivot bearing of the carrier 14, so that pressure springs 30 arranged between the legs of the U-shaped curved current band act as contact force springs. If, on the other hand, the drive device is released and the isolating coupling 25 is thereby released, the compression springs 30 act as switch-off springs and transfer the contact arrangement into the switch-off position shown in FIG. 1.
  • a switching arc occurs only at the burnout contacts, provided the current flowing through the contact arrangement does not exceed a certain level.
  • the switching arc is then taken over by the arcing horns 22 and 23 and transferred to the arcing chamber 24.
  • This process is favored in a known manner by guide rails 31 which, in the example shown, have a U-shaped profile and are dimensioned such that the tips of the arcing horns 22 and 23 lie between the legs 32 and 33 of the arc guide rails 31.
  • each arc guide piece 40 is provided with an extension 41 which rests on the fixed connecting rail 5.
  • a screw 42 is used to jointly fasten the connecting bar 5 and the arc guide piece 40 to the insulating block 4 by means of a threaded bush 43 embedded in the insulating block 4 the contact piece supports 6 reached.
  • the further edges 45 and 46 act as leading edges of the partial arcs upwards in the direction of the arcing horns 22 and 23. These edges are at an acute angle to one another and are dimensioned such that they reach the arcing horn 22 beyond the contact piece support 10.
  • the different embodiments shown in the left and right parts of FIG. 2 show that the size of the arc guide pieces can be easily adapted to the number of main contacts present.
  • the lower edge 44 'of the arc guide piece 40' is longer, as is the edge 45 'leading to the arcing horn.
  • the arc guide pieces 40 and 40 ' can be made of sheet steel with an angled portion for fastening. In the illustrated In the exemplary embodiment, however, the arc guide pieces are made of cast steel, since the parts of different thickness desired for guiding the arcs and for fastening can be produced more easily in this way. A relatively large thickness of the arc guide pieces, ie a correspondingly large mass of ferromagnetic material, can prove to be advantageous for the desired effect. Good results have been achieved, for example, in a circuit breaker for a rated current of 1600 A with two main contacts (left part of FIG. 2) in connection with two arc guiding pieces made of jet casting each weighing 60 g.
  • the fixed part 2 of the contact arrangement 1 is provided with arcing elements.
  • This arrangement has proven to be effective and has the advantage that the mass of the movable part 3 does not have to be increased by additional parts.
  • the movable part 3 could also be provided with arc guide pieces, although it may be sufficient, in contrast to the solid arc guide pieces described, to use thinner material, e.g. made of sheet steel. In this case the magnification of the moving mass is so small that an influence on the mechanical switching process cannot be determined.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Claims (5)

1. Dispositif de contact (1) pour un interrupteur de puissance basse tension, comportant des contacts principaux (5, 6; 16, 17) servant à véhiculer un courant permanent, et des contacts pare-étincelles (7, 10; 20, 21) servant à amorcer un arc électrique de coupure dans la zone d'entrée d'une chambre (24) d'extinction de l'arc, ainsi que des cornes (22; 23) servant à faire passer l'arc de commutation dans la chambre (24) d'extinction de l'arc, et dans lequel au moins deux support de pièces de contact (6; 17) des contacts principaux sont disposés côté-à-côte en série et, à distance de ces supports, au moins un support des pièces de contact des contacts pare-étincelles (10; 21), caractérisé par le fait qu'un élément (40, 40') de guidage de l'arc, réalisé en un matériau ferromagnétique, est disposé dans l'espace compris entre les supports des pièces de contact des contacts principaux (6; 17) et le support des pièces de contact des contacts pare-étincelles (10; 21).
2. Dispositif de contact suivant la revendication 1, caractérisé par le fait que l'élément .(40, 40') de guidage de l'arc possède une configuration approximativement triangulaire, un bord (44, 44') de la forme triangulaire s'appliquant directement au-dessus du bord supérieur des supports des pièces de contact (6) des contacts principaux, tandis qu'un autre bord (46, 46') recouvre l'expase intercalaire présent entre le bord supérieur des supports des pièces de contact (6) des contacts principaux et le bord supérieur du support associé (10) des pièces de contact des contacts pare-étincelles.
3. Dispositif de contact suivant la revendication 2, caractérisé par le fait que deux bords (44, 45, 44', 45') de la forme triangulaire de l'élément (40, 40') de guidage de l'arc, qui se coupent sous un angle aigu, sont agencés de manière à s'étendre depuis leur point d'intersection jusqu'à la corne (22, 23) de passage de l'arc du contact pare-étincelles associé (7, 10; 20, 21).
4. Dispositif de contact suivant la revendication 1, caractérisé par le fait que l'élément (40, 40') de guidage de l'arc est réalisé sous la forme d'une pièce en acier moulé et possède une partie à paroi épaisse servant à guider des arcs et une branche à paroi mince (41) pour la fixation sur le contact principal associé (5, 6).
5. Dispositif de contact suivant la revendication 1, caractérisé par le fait que seule la partie fixe (2) du dispositif de contact (1) est pourvue d'éléments (40, 40') de guidage des arcs.
EP86730160A 1985-11-06 1986-10-16 Montage de contacts pour interrupteur à charge à basse tension avec des contacts principaux et des contacts d'amorçage d'arc Expired - Lifetime EP0222684B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853539673 DE3539673A1 (de) 1985-11-06 1985-11-06 Kontaktanordnung fuer niederspannungs-leistungsschalter mit hauptkontakten und abbrennkontakten
DE3539673 1985-11-06

Publications (2)

Publication Number Publication Date
EP0222684A1 EP0222684A1 (fr) 1987-05-20
EP0222684B1 true EP0222684B1 (fr) 1990-01-17

Family

ID=6285499

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86730160A Expired - Lifetime EP0222684B1 (fr) 1985-11-06 1986-10-16 Montage de contacts pour interrupteur à charge à basse tension avec des contacts principaux et des contacts d'amorçage d'arc

Country Status (4)

Country Link
US (1) US4720613A (fr)
EP (1) EP0222684B1 (fr)
JP (1) JP2606798B2 (fr)
DE (2) DE3539673A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8715757U1 (de) * 1987-11-25 1988-02-18 Siemens AG, 1000 Berlin und 8000 München Niederspannungs-Leistungsschalter
US4926018A (en) * 1988-09-08 1990-05-15 Siemens Energy & Automation, Inc. Moving mains arc movement loop
JPH0684652U (ja) * 1993-05-11 1994-12-02 株式会社東海理化電機製作所 スライドスイッチ
DE19913236C2 (de) * 1999-03-23 2001-02-22 Siemens Ag Verfahren zur Strombegrenzung in Niederspannungsnetzen und zugehörige Anordnung
DE19930813A1 (de) * 1999-06-30 2001-01-04 Siemens Ag Leistungsschalter mit Anschlußschienen für verschiedene Nennströme
FR2795858B1 (fr) * 1999-07-01 2001-09-14 Schneider Electric Ind Sa Appareillage electrique de coupure dont un organe de contact est muni d'un pare etincelle
DE19939710A1 (de) 1999-08-18 2001-02-22 Siemens Ag Anschlußschienen für elektrische Geräte und Apparate für verschiedene Nennströme
DE10250950B4 (de) * 2002-10-25 2004-10-28 Siemens Ag Niederspannungs-Leistungsschalter
JP6005085B2 (ja) * 2014-03-10 2016-10-12 三菱電機株式会社 開閉装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1000486B (de) * 1954-05-04 1957-01-10 Calor Emag Elektrizitaets Ag Hornfoermiger Schaltkontakt mit einer Einlage aus magnetischem Material
IT712788A (fr) * 1963-08-21
JPS4213041Y1 (fr) * 1964-05-04 1967-07-25
JPS4511130Y1 (fr) * 1965-09-07 1970-05-19
DE1690137B2 (de) * 1968-01-31 1973-08-30 Siemens AG, 1000 Berlin u 8000 München Elektrischer leistungsschalter, insbesondere niederspannungs-leistungsschalter
US3749867A (en) * 1971-04-01 1973-07-31 Westinghouse Electric Corp Spaced-metallic-plate-type of arc-chute for a switch
US3784775A (en) * 1972-07-27 1974-01-08 Ite Imperial Corp Arc runner between stationary contacts

Also Published As

Publication number Publication date
EP0222684A1 (fr) 1987-05-20
DE3539673A1 (de) 1987-05-07
DE3668394D1 (de) 1990-02-22
JPS62108418A (ja) 1987-05-19
US4720613A (en) 1988-01-19
JP2606798B2 (ja) 1997-05-07

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