EP1374263B1 - Switching arrangement for low-voltage circuit breakers - Google Patents

Switching arrangement for low-voltage circuit breakers Download PDF

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Publication number
EP1374263B1
EP1374263B1 EP02724107A EP02724107A EP1374263B1 EP 1374263 B1 EP1374263 B1 EP 1374263B1 EP 02724107 A EP02724107 A EP 02724107A EP 02724107 A EP02724107 A EP 02724107A EP 1374263 B1 EP1374263 B1 EP 1374263B1
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EP
European Patent Office
Prior art keywords
contact
levers
lever
moveable
switching arrangement
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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 - Fee Related
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EP02724107A
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German (de)
French (fr)
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EP1374263A1 (en
Inventor
Günter SEIDLER-STAHL;
Detlev Schmidt
Sezai TÜRKMEN
Michael Sebekow
Michael Bach
Ingo Thiede
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Siemens AG
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Siemens AG
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Publication of EP1374263A1 publication Critical patent/EP1374263A1/en
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    • 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

Definitions

  • the invention relates to a switching arrangement for low-voltage circuit breaker with high rated current, which comprises substantially arranged on a movable contact carrier movable switch contacts, fixed switch contacts and means for cooling, deionizing and extinguishing the switching arc.
  • High-voltage low-voltage circuit-breakers have a physically very wide contact system due to their function. This is dependent on the continuous current of the switch and not on its switching capacity, which is generally the same for all switches, regardless of their rated current and to a maximum of 100 kA.
  • the rail cross-section and thus also the width of the busbars and the contact system are therefore dimensioned according to the continuous current.
  • the movable contacts are designed as multiple contact systems with a certain number of identical contact lever. These contact levers are conventional, except with their main contact, additionally provided with a pre-contact and an arcing horn.
  • Such an arrangement is for example in the EP 0 410 902 B1 shown.
  • a low voltage circuit breaker with a movable multiple contact for high current ratings which has a plurality of contact fingers of equal length, which are arranged in a small relative distance parallel to each other and a fixed main contact, which cooperates in the closed position with a movable main contact of each contact finger.
  • at least one movable arc contact is provided, which is arranged between the end of at least one contact finger and the movable main contact.
  • These movable arcing contacts cooperate with a fixed arcing contact that is configured to center the arc with respect to the center axis of the switching pole. That means he, as in particular in the Fig.
  • the object of the present invention is therefore to provide a circuit arrangement for low-voltage circuit breaker with high rated current, in which the conditional by the plurality of existing contact lever and their pressure considerable forces are reduced to the contact carrier and in particular a more uniform distribution of the attacking forces the bearing pin of the contact lever is reached.
  • a switching arrangement for low-voltage circuit breaker with high rated current which essentially comprises arranged on a movable contact carrier movable switch contacts, fixed switch contacts and means for cooling, deionizing and extinguishing the switching arc, achieved by one over the entire contact width continuous solid contact with Vor.funktion is provided and the movable contact lever with and without Vor animation, distributed in a different manner from the conventional arrangement, over the entire width of the contact in a defined order, wherein alternately at least one movable contact lever with Vor animation and at least a movable contact lever without precontact are arranged consecutively.
  • the contact lever without precontact which are conventionally arranged only on the outer sides of the movable switching contacts, are provided distributed over the entire width of the movable contact carrier, ie also in the central region.
  • the arrangement of the contact lever can be made so that over the entire width of the contact carrier alternately a contact lever with precontact and a contact lever without precontact are provided consecutively.
  • the distribution of the contact lever can also be such that they are provided in sections or in packages by successively alternately two or more contact lever with Vor animation and two or more contact lever are provided without precontact.
  • the contact levers or the contact lever packages are arranged symmetrically such that contact levers are arranged without precontacting on the outer sides of the contact carrier.
  • contact levers or the contact lever packages may also be expedient to arrange the contact levers or the contact lever packages symmetrically so that contact levers with precontact are respectively arranged on the outer sides of the contact carrier.
  • the Fig. 1 shows a populated according to the present invention movable contact carrier with multiple contact.
  • the Fig. 2 schematically shows the arrangement of the contact lever on the movable contact carrier under the arc quenching device in a first possible embodiment.
  • the Fig. 3 schematically shows the arrangement of the contact lever on the movable contact carrier under the arc quenching device in a possible variant.
  • the Fig. 1 shows a movable contact carrier 1 with multiple contact for a low-voltage circuit breaker for high rated currents, which has a plurality of movable contact lever 2, 3, which at a small relative distance parallel to each other are arranged.
  • These movable VorITAe 5 act, as well as the main movable contacts 4 in a known manner with not shown fixed front and main contacts together.
  • the contact levers 3, which are not provided with precontacts 5, are arranged in a defined order deviating from the conventional arrangement, which is limited to the outer regions, in which they are provided in sections or in packages.
  • the order is not limited to the order shown in this example, in which, starting from one side of the contact carrier 1, two contact lever 3 without precontact 5 seven contact lever 2 with precontact 5 and then four contact lever 3 without precontact, seven contact lever 2 with precontact 5 and two contact lever 3 without precontact 5.
  • the different contact lever 2, 3 are arranged symmetrically on the contact carrier 1 for the sake of a uniform distribution of forces. As a result, the bending stress and possible deflection of the highly stressed bearing pin 12 of the contact lever 2, 3 is reduced or displaced away from the central region of the bearing pin 12 and the attacking bending forces are distributed more evenly.
  • the Fig. 2 schematically shows the arrangement of the contact lever 2, 3 of the movable contact carrier 1, not shown under the arc quenching device 7 in a first possible embodiment, in which the contact lever 2, 3, with or without VorAND 5, in a similar order as in Fig. 1 , are arranged in packages.
  • the contact lever 2, 3, with or without VorAND 5, in a similar order as in Fig. 1 are arranged in packages.
  • the contact lever 2, 3, with or without VorAND 5, in a similar order as in Fig. 1 are arranged in packages.
  • the effective precontacts 5 across the width the contact carrier 1 and the consequent spatial distribution of the resulting Operaschaltlichtbögen it is possible to realize a subdivision of the total quenching device 7 in juxtaposed partial erasures 8, 9, 10 with several monddlingen 13, 14, 15, 16 for the switching arc.
  • the cost of parallel extinguishing equipment in the form of spatially separated units is reduced by the design of partial erasures in an extinguishing space and the width of the switch is
  • the Fig. 3 schematically shows the arrangement of the contact lever 2, 3 of the movable contact carrier 1, not shown below the arc quenching device 11 in a possible variant in which in the sequence alternately each contact lever 3 without precontact 5 and a contact lever 2 with precontact 5 continuously over the entire width of the contact carrier 1 are arranged.
  • the design of the arc quenching device 11 here corresponds expediently to the expected substantially uniform distribution of the switching arc over the entire switching contact width.
  • the Pol Weg Sign is reduced at the first contact contact, which is why the required power of the Einschalturss can be lowered. This results in a lower load on all mechanical components of the drive system, or an increase in the mechanical life. Due to the design of the fixed contact over the entire rail width, the continuous current heating is positively influenced. The larger amount of copper causes a higher temperature gradient and thus a better heat dissipation. The commutation of the current is significantly improved, which leads to a better extinguishing behavior of the arc quenching device.

Description

Die Erfindung betrifft eine Schaltanordnung für Niederspannungs-Leistungsschalter mit hohem Nennstrom, die im Wesentlichen auf einem bewegbaren Kontaktträger angeordnete bewegbare Schaltkontakte, feststehende Schaltkontakte und eine Einrichtung zum Abkühlen, Entionisieren und Löschen des Schaltlichtbogens umfasst.The invention relates to a switching arrangement for low-voltage circuit breaker with high rated current, which comprises substantially arranged on a movable contact carrier movable switch contacts, fixed switch contacts and means for cooling, deionizing and extinguishing the switching arc.

Niederspannungs-Leistungsschalter mit hohem Nennstrom weisen funktionsbedingt ein körperlich sehr breites Kontaktsystem auf. Das ist abhängig vom Dauerstrom des Schalters und nicht von seinem Schaltvermögen, das für alle Schalter, unabhängig von deren Nennstrom, im allgemeinen gleich und auf etwa maximal 100 kA bemessen ist. Der Schienenquerschnitt und somit auch die Breite der Stromschienen sowie des Kontaktsystems sind folglich nach dem Dauerstrom bemessen. Bei derartigen Kontaktsystemen sind die bewegbaren Kontakte als Vielfach-Kontaktsysteme mit einer bestimmten Anzahl gleicher Kontakthebel ausgebildet. Diese Kontakthebel sind herkömmlich, außer mit ihrem Hauptkontakt, zusätzlich mit einem Vorkontakt und einem Lichtbogenhorn versehen. Durch diese Formgebung wird bei der Abhebbewegung des bewegbaren Schaltkontaktes eine Kommutierung des Stromes bewirkt, also ein Übergang des Stromes vom Hauptkontakt zum Vorkontakt. Dadurch ergibt sich eine geringe Dauerstromwärme, weil der Dauerstrom durch die Hauptkontakte geführt wird, die mit den festen Gegenkontakten des Schalters zusammenwirken und beim Schaltvorgang nicht durch Lichtbögen beansprucht werden. Diese Hauptkontakte sind abbrandsicher und behalten dadurch eine gute Oberfläche, weshalb ihr Übergangswiderstand und damit die Dauerstromerwärmung niedrig ist.High-voltage low-voltage circuit-breakers have a physically very wide contact system due to their function. This is dependent on the continuous current of the switch and not on its switching capacity, which is generally the same for all switches, regardless of their rated current and to a maximum of 100 kA. The rail cross-section and thus also the width of the busbars and the contact system are therefore dimensioned according to the continuous current. In such contact systems, the movable contacts are designed as multiple contact systems with a certain number of identical contact lever. These contact levers are conventional, except with their main contact, additionally provided with a pre-contact and an arcing horn. By this shaping, a commutation of the current is effected during the lifting movement of the movable switching contact, ie a transition of the current from the main contact to the pre-contact. This results in a low continuous current heat, because the continuous current is passed through the main contacts, which cooperate with the fixed mating contacts of the switch and are not claimed during the switching process by arcs. These main contacts are resistant to burn-off and therefore retain a good surface, which is why their contact resistance and thus the continuous current heating is low.

Bei Leistungsschaltern für hohe und höchste Beanspruchung, zum Beispiel bei strombegrenzenden Leistungsschaltern wirken durch die Vielzahl der vorhandenen Kontakthebel und deren Andruckkräfte erhebliche Kräfte auf den Kontaktträger, insbesondere auch auf die Lagerung der Kontakthebel im Kontaktträger, wodurch unter Umständen die Grenzen der Werkstoffbelastbarkeit schnell erreicht werden. Deshalb ist es wünschenswert, die Summe der Kontaktkräfte aller auf einem Gelenkbolzen angeordneten Kontakthebel auf den Kontaktträger zu verringern. Bei den bekannten herkömmlichen Niederspannungs-Leistungsschaltern ist es deshalb üblich, auf der feststehenden Kontaktseite einen Vorkontakt anzuordnen, der aufgrund seiner Dimensionierung bewirkt, dass nur eine bestimmte Anzahl von Kontakthebeln des bewegbaren Kontaktes eine Kontaktberührung mit ihm hat. Dieser feststehende Vorkontakt ist bei herkömmlichen Niederspannungs-Leistungsschaltern schmaler als der Hauptkontakt und mittig zur gesamten Kontaktbreite angeordnet.For circuit breakers for high and heavy duty, for example, current limiting circuit breakers act by the large number of existing contact lever and their pressure forces considerable forces on the contact carrier, especially on the bearing of the contact lever in the contact carrier, which may be reached the limits of material load capacity quickly. Therefore, it is desirable to reduce the sum of the contact forces of all disposed on a hinge pin contact lever on the contact carrier. In the known conventional low-voltage circuit breakers, it is therefore customary to arrange a pre-contact on the fixed contact side, which causes due to its dimensioning that only a certain number of contact levers of the movable contact has a contact contact with him. This fixed pre-contact is narrower in conventional low-voltage circuit breakers than the main contact and centered to the entire contact width.

Eine derartige Anordnung ist beispielsweise in der EP 0 410 902 B1 dargestellt. Hier ist ein Niederspannungs-Leistungsschalter mit einem bewegbaren Mehrfachkontakt für hohe Nennströme gezeigt, der mehrere Kontaktfinger gleicher Länge aufweist, die in geringem relativen Abstand parallel zueinander angeordnet sind und ein feststehender Hauptkontakt, der in der Einschaltstellung mit einem bewegbaren Hauptkontakt jedes einzelnen Kontaktfingers zusammenwirkt. Weiterhin ist mindestens ein bewegbarer Lichtbogenkontakt vorgesehen, der zwischen dem Ende mindestens eines Kontaktfingers und dem bewegbaren Hauptkontakt angeordnet ist. Diese bewegbaren Lichtbogenkontakte wirken mit einem feststehenden Lichtbogenkontakt zusammen, der so ausgeführt ist, dass der Lichtbogen in Bezug auf die Mittelachse des Schaltpoles zentriert wird. Das bedeutet, dass er, wie insbesondere in der Fig. 2 der Patentschrift zu erkennen ist, zentral und schmaler ausgebildet ist, als der feststehende Hauptkontakt. Andere Anordnungen weisen bewegbare Kontakte auf, bei denen nicht alle Kontakthebel mit Vorkontakten versehen sind. Dabei befinden sich diese nicht mit Vorkontakten versehenen Kontakthebel herkömmlich an den Außenseiten des Vielfachkontaktes. Das ist beispielsweise bei dem Niederspannungs-Leistungsschalter nach der US 5210385 oder DE 197 27 696 der Fall.Such an arrangement is for example in the EP 0 410 902 B1 shown. Here is shown a low voltage circuit breaker with a movable multiple contact for high current ratings, which has a plurality of contact fingers of equal length, which are arranged in a small relative distance parallel to each other and a fixed main contact, which cooperates in the closed position with a movable main contact of each contact finger. Furthermore, at least one movable arc contact is provided, which is arranged between the end of at least one contact finger and the movable main contact. These movable arcing contacts cooperate with a fixed arcing contact that is configured to center the arc with respect to the center axis of the switching pole. That means he, as in particular in the Fig. 2 The patent is recognizable, is formed centrally and narrower than the fixed main contact. Other arrangements have movable contacts in which not all contact levers are provided with Vorkontakten. In this case, these not provided with precontact contact lever are traditionally on the outsides of the multiple contact. This is, for example, in the low-voltage circuit breaker after the US 5210385 or DE 197 27 696 the case.

Alle diese Anordnungen weisen den Nachteil auf, dass die Biegebeanspruchung des Lagerbolzens der bewegbaren Kontakthebel durch die vorwiegend mittige Krafteinwirkung derselben besonders hoch ist.All of these arrangements have the disadvantage that the bending stress of the bearing pin of the movable contact lever is particularly high due to the predominantly central force of the same.

Die Aufgabe der vorliegenden Erfindung besteht deshalb darin, eine Schaltanordnung für Niederspannungs-Leistungsschalter mit hohem Nennstrom zu schaffen, bei welcher die durch die Vielzahl der vorhandenen Kontakthebel und deren Andruckkräfte bedingten erheblichen Kräfte auf den Kontaktträger verringert werden und insbesondere eine gleichmäßigere Verteilung der angreifenden Kräfte auf den Lagerbolzen der Kontakthebel erreicht wird.The object of the present invention is therefore to provide a circuit arrangement for low-voltage circuit breaker with high rated current, in which the conditional by the plurality of existing contact lever and their pressure considerable forces are reduced to the contact carrier and in particular a more uniform distribution of the attacking forces the bearing pin of the contact lever is reached.

Diese Aufgabe wird bei einer Schaltanordnung für Niederspannungs-Leistungsschalter mit hohem Nennstrom, die im Wesentlichen auf einem bewegbaren Kontaktträger angeordnete bewegbare Schaltkontakte, feststehende Schaltkontakte und eine Einrichtung zum Abkühlen, Entionisieren und Löschen des Schaltlichtbogens umfasst, dadurch gelöst, dass ein über die gesamte Kontaktbreite durchgängiger Festkontakt mit Vorkontaktfunktion vorgesehen ist und die bewegbaren Kontakthebel mit und ohne Vorkontakt, in einer von der herkömmlichen Anordnung unterschiedlichen Art, über die gesamte Breite des Kontaktes in einer definierten Reihenfolge verteilt angeordnet sind, wobei wechselweise wenigstens ein bewegbarer Kontakthebel mit Vorkontakt und wenigstens ein bewegbarer Kontakthebel ohne Vorkontakt aufeinander folgend angeordnet sind. Das heißt, dass die Kontakthebel ohne Vorkontakt, die herkömmlich nur an den äußeren Seiten der bewegbaren Schaltkontakte angeordnet sind, über die gesamte Breite des bewegbaren Kontaktträgers verteilt vorgesehen werden, also auch im mittleren Bereich. Dabei kann die Anordnung der Kontakthebel so erfolgen, dass über die gesamte Breite des Kontaktträgers im Wechsel jeweils ein Kontakthebel mit Vorkontakt und ein Kontakthebel ohne Vorkontakt aufeinander folgend vorgesehen werden.This object is achieved in a switching arrangement for low-voltage circuit breaker with high rated current, which essentially comprises arranged on a movable contact carrier movable switch contacts, fixed switch contacts and means for cooling, deionizing and extinguishing the switching arc, achieved by one over the entire contact width continuous solid contact with Vorkontaktfunktion is provided and the movable contact lever with and without Vorkontakt, distributed in a different manner from the conventional arrangement, over the entire width of the contact in a defined order, wherein alternately at least one movable contact lever with Vorkontakt and at least a movable contact lever without precontact are arranged consecutively. This means that the contact lever without precontact, which are conventionally arranged only on the outer sides of the movable switching contacts, are provided distributed over the entire width of the movable contact carrier, ie also in the central region. In this case, the arrangement of the contact lever can be made so that over the entire width of the contact carrier alternately a contact lever with precontact and a contact lever without precontact are provided consecutively.

Die Verteilung der Kontakthebel kann aber auch so erfolgen, dass sie abschnittsweise oder paketweise vorgesehen werden, indem aufeinanderfolgend abwechselnd zwei oder mehr Kontakthebel mit Vorkontakt und zwei oder mehr Kontakthebel ohne Vorkontakt vorgesehen werden.The distribution of the contact lever can also be such that they are provided in sections or in packages by successively alternately two or more contact lever with Vorkontakt and two or more contact lever are provided without precontact.

Vorteilhaft werden die Kontakthebel oder die Kontakthebelpakete derart symmetrisch angeordnet, dass an den Außenseiten des Kontaktträgers jeweils Kontakthebel ohne Vorkontakt angeordnet sind.Advantageously, the contact levers or the contact lever packages are arranged symmetrically such that contact levers are arranged without precontacting on the outer sides of the contact carrier.

Es kann aber auch zweckmäßig sein, die Kontakthebel oder die Kontakthebelpakete symmetrisch so anzuordnen, dass an den Außenseiten des Kontaktträgers jeweils Kontakthebel mit Vorkontakt angeordnet sind.However, it may also be expedient to arrange the contact levers or the contact lever packages symmetrically so that contact levers with precontact are respectively arranged on the outer sides of the contact carrier.

Dadurch wird die Biegebeanspruchung und eventuelle Durchbiegung des hochbeanspruchten Lagerbolzens der Kontakthebel verringert bzw. vom Mittelbereich weg verlagert und die Biegekräfte werden gleichmäßiger verteilt.As a result, the bending stress and possible deflection of the highly stressed bearing pin of the contact lever is reduced or shifted away from the central region and the bending forces are distributed more evenly.

Bei einer derartigen Verteilung der wirksamen Vorkontakte über die Breite des Kontaktträgers und die dadurch bedingte örtliche Verteilung der Teilschaltlichtbögen ist es möglich, eine Unterteilung der Gesamtlöscheinrichtung in nebeneinander angeordnete Teillöscheinrichtungen mit mehreren Fußpunkten für den Schaltlichtbogen zu realisieren. Hierdurch wird der Aufwand paralleler Löscheinrichtungen in räumlich getrennte Einheiten durch die Gestaltung von Teillöscheinrichtungen in einem Löschraum verringert und die Baubreite des Schalters wird minimiert.With such a distribution of the effective pre-contacts across the width of the contact carrier and the consequent spatial distribution of Teilschaltlichtbögen, it is possible to realize a subdivision of the total quenching device in juxtaposed partial erasures with several Fußpunkten for the switching arc. As a result, the cost of parallel extinguishing equipment is reduced in spatially separated units by the design of partial erasures in an extinguishing space and the width of the switch is minimized.

Die Erfindung soll nachfolgend zum besseren Verständnis anhand eines bevorzugten, den Schutzumfang nicht einschränkenden Ausführungsbeispiels näher erläutert werden.The invention will be explained in the following for better understanding with reference to a preferred, non-limiting scope of the invention.

Die Fig. 1 zeigt einen gemäß der vorliegenden Erfindung bestückten bewegbaren Kontaktträger mit Mehrfachkontakt.The Fig. 1 shows a populated according to the present invention movable contact carrier with multiple contact.

Die Fig. 2 zeigt schematisch die Anordnung der Kontakthebel auf dem bewegbaren Kontaktträger unter der Lichtbogenlöscheinrichtung in einer ersten möglichen Ausführung.The Fig. 2 schematically shows the arrangement of the contact lever on the movable contact carrier under the arc quenching device in a first possible embodiment.

Die Fig. 3 zeigt schematisch die Anordnung der Kontakthebel auf dem bewegbaren Kontaktträger unter der Lichtbogenlöscheinrichtung in einer möglichen Variante.The Fig. 3 schematically shows the arrangement of the contact lever on the movable contact carrier under the arc quenching device in a possible variant.

Die Fig. 1 zeigt einen bewegbaren Kontaktträger 1 mit Mehrfachkontakt für einen Niederspannungs-Leistungsschalter für hohe Nennströme, der mehrere bewegbare Kontakthebel 2, 3 aufweist, die in geringem relativen Abstand parallel zueinander angeordnet sind. Dabei weist ein Teil der Kontakthebel 2 außer dem Hauptkontakt 4 einen Vorkontakt 5 auf, der zwischen dem als Lichtbogenhorn 6 ausgebildeten Ende des Kontakthebels 2 und dem Hauptkontakt 4 angeordnet ist. Diese bewegbaren Vorkontakte 5 wirken, ebenso wie die bewegbaren Hauptkontakte 4 in bekannter Weise mit nicht dargestellten feststehenden Vor- und Hauptkontakten zusammen. Erfindungsgemäß sind die nicht mit Vorkontakten 5 versehenen Kontakthebel 3 in einer von der herkömmlichen, auf die äußeren Bereiche beschränkten, Anordnung abweichenden, definierten Reihenfolge angeordnet, bei der sie abschnittsweise oder paketweise vorgesehen sind. Dabei ist die Reihenfolge nicht auf die im vorliegenden Beispiel dargestellte Reihenfolge beschränkt, bei welcher, angefangen von einer Seite des Kontaktträgers 1, auf zwei Kontakthebel 3 ohne Vorkontakt 5 sieben Kontakthebel 2 mit Vorkontakt 5 folgen und darauf wieder vier Kontakthebel 3 ohne Vorkontakt, sieben Kontakthebel 2 mit Vorkontakt 5 sowie zwei Kontakthebel 3 ohne Vorkontakt 5. Dabei sind die unterschiedlichen Kontakthebel 2, 3 auf dem Kontaktträger 1 aus Gründen einer gleichmäßigen Kräfteverteilung symmetrisch angeordnet. Dadurch wird die Biegebeanspruchung und eventuelle Durchbiegung des hochbeanspruchten Lagerbolzens 12 der Kontakthebel 2, 3 verringert bzw. vom Mittelbereich des Lagerbolzens 12 weg verlagert und die angreifenden Biegekräfte werden gleichmäßiger verteilt.The Fig. 1 shows a movable contact carrier 1 with multiple contact for a low-voltage circuit breaker for high rated currents, which has a plurality of movable contact lever 2, 3, which at a small relative distance parallel to each other are arranged. In this case, a part of the contact lever 2 except the main contact 4 to a precontact 5, which is arranged between the formed as an arcing horn 6 end of the contact lever 2 and the main contact 4. These movable Vorkontakte 5 act, as well as the main movable contacts 4 in a known manner with not shown fixed front and main contacts together. According to the invention, the contact levers 3, which are not provided with precontacts 5, are arranged in a defined order deviating from the conventional arrangement, which is limited to the outer regions, in which they are provided in sections or in packages. The order is not limited to the order shown in this example, in which, starting from one side of the contact carrier 1, two contact lever 3 without precontact 5 seven contact lever 2 with precontact 5 and then four contact lever 3 without precontact, seven contact lever 2 with precontact 5 and two contact lever 3 without precontact 5. In this case, the different contact lever 2, 3 are arranged symmetrically on the contact carrier 1 for the sake of a uniform distribution of forces. As a result, the bending stress and possible deflection of the highly stressed bearing pin 12 of the contact lever 2, 3 is reduced or displaced away from the central region of the bearing pin 12 and the attacking bending forces are distributed more evenly.

Die Fig. 2 zeigt schematisch die Anordnung der Kontakthebel 2, 3 des nicht dargestellten bewegbaren Kontaktträgers 1 unter der Lichtbogenlöscheinrichtung 7 in einer ersten möglichen Ausführung, bei welcher die Kontakthebel 2, 3, mit oder ohne Vorkontakt 5, in einer ähnlichen Reihenfolge wie in der Fig. 1, paketweise angeordnet sind. Bei der hier dargestellten Verteilung der wirksamen Vorkontakte 5 über die Breite des Kontaktträgers 1 und die dadurch bedingte örtliche Verteilung der entstehenden Teilschaltlichtbögen ist es möglich, eine Unterteilung der Gesamtlöscheinrichtung 7 in nebeneinander angeordnete Teillöscheinrichtungen 8, 9, 10 mit mehreren Fußpunkten 13, 14, 15, 16 für den Schaltlichtbogen zu realisieren. Hierdurch wird der Aufwand paralleler Löscheinrichtungen in Form räumlich getrennter Einheiten durch die Gestaltung von Teillöscheinrichtungen in einem Löschraum verringert und die Baubreite des Schalters wird minimiert.The Fig. 2 schematically shows the arrangement of the contact lever 2, 3 of the movable contact carrier 1, not shown under the arc quenching device 7 in a first possible embodiment, in which the contact lever 2, 3, with or without Vorkontakt 5, in a similar order as in Fig. 1 , are arranged in packages. In the distribution shown here of the effective precontacts 5 across the width the contact carrier 1 and the consequent spatial distribution of the resulting Teilschaltlichtbögen, it is possible to realize a subdivision of the total quenching device 7 in juxtaposed partial erasures 8, 9, 10 with several Fußpunkten 13, 14, 15, 16 for the switching arc. As a result, the cost of parallel extinguishing equipment in the form of spatially separated units is reduced by the design of partial erasures in an extinguishing space and the width of the switch is minimized.

Die Fig. 3 zeigt schematisch die Anordnung der Kontakthebel 2, 3 des nicht dargestellten bewegbaren Kontaktträgers 1 unter der Lichtbogenlöscheinrichtung 11 in einer möglichen Variante, bei welcher in der Folge abwechselnd jeweils ein Kontakthebel 3 ohne Vorkontakt 5 und ein Kontakthebel 2 mit Vorkontakt 5 fortlaufend über die Gesamtbreite des Kontaktträgers 1 angeordnet sind. Die Ausbildung der Lichtbogenlöscheinrichtung 11 entspricht hier zweckmäßig der zu erwartenden im Wesentlichen gleichmäßigen Verteilung des Schaltlichtbogens über die gesamte Schaltkontaktbreite.The Fig. 3 schematically shows the arrangement of the contact lever 2, 3 of the movable contact carrier 1, not shown below the arc quenching device 11 in a possible variant in which in the sequence alternately each contact lever 3 without precontact 5 and a contact lever 2 with precontact 5 continuously over the entire width of the contact carrier 1 are arranged. The design of the arc quenching device 11 here corresponds expediently to the expected substantially uniform distribution of the switching arc over the entire switching contact width.

Durch die gleichmäßige Verteilung der unterschiedlichen Kontakthebel über die gesamte Breite des Kontaktträgers und eine dadurch gegebenenfalls mögliche Verringerung der Anzahl der mit Vorkontakten zu versehenden Kontakthebel, wird die Polrückwirkung bei der ersten Kontaktberührung verringert, weshalb die erforderliche Leistung des Einschaltspeichers gesenkt werden kann. Daraus resultiert eine geringere Belastung aller mechanischen Bauteile des Antriebssystems, beziehungsweise eine Erhöhung der mechanischen Lebensdauer. Durch die Ausbildung des Festkontaktes über die gesamte Schienenbreite wird die Dauerstromerwärmung positiv beeinflusst. Die größere Kupfermenge bewirkt einen höheren Temperaturgradienten und damit eine bessere Wärmeableitung. Die Kommutierung des Stromes wird deutlich verbessert, was zu einem besseren Löschverhalten der Lichtbogenlöscheinrichtung führt.Due to the uniform distribution of the different contact lever over the entire width of the contact carrier and thereby possibly possible reduction in the number of pre-contacts to be provided contact lever, the Polrückwirkung is reduced at the first contact contact, which is why the required power of the Einschaltspeichers can be lowered. This results in a lower load on all mechanical components of the drive system, or an increase in the mechanical life. Due to the design of the fixed contact over the entire rail width, the continuous current heating is positively influenced. The larger amount of copper causes a higher temperature gradient and thus a better heat dissipation. The commutation of the current is significantly improved, which leads to a better extinguishing behavior of the arc quenching device.

Claims (6)

  1. Switching arrangement for low-voltage power breakers having a high rated current which essentially has moveable contact levers (2, 3) arranged on a moveable contact support (1), stationary switching contacts and a device for cooling, deionizing and quenching the switching arc (7, 11), a stationary contact, which extends over the entire contact width and has a primary arcing contact function, being provided, and the moveable contact levers (2, 3) with and without a primary arcing contact (5) being arranged distributed over the entire width of the contact support (1) in a defined sequence, characterized in that at least one moveable contact lever (2) with a primary arcing contact (5) and at least one moveable contact lever (3) without a primary arcing contact are arranged one after the other in an alternating fashion.
  2. Switching arrangement according to Claim 1,
    characterized in that
    the moveable contact levers (2, 3) are arranged such that in each case one contact lever (2) with a primary arcing contact (5) and one contact lever (3) without a primary arcing contact (5) are provided one after the other in an alternating fashion over the entire width of the contact support (1).
  3. Switching arrangement according to Claim 1,
    characterized in that
    the moveable contact levers (2, 3) are arranged such that two or more contact levers (2) with a primary arcing contact (5) and two or more contact levers (3) without a primary arcing contact are provided in groups, one after the other in an alternating fashion.
  4. Switching arrangement according to Claim 1,
    characterized in that
    the moveable contact levers (2, 3) or the groups of contact levers are arranged symmetrically such that contact levers (3) without a primary arcing contact are in each case arranged on the outsides of the contact support (1).
  5. Switching arrangement according to Claim 1,
    characterized in that
    the moveable contact levers (2, 3) or the groups of contact levers are arranged symmetrically such that contact levers (2) with a primary arcing contact (5) are in each case arranged on the outsides of the contact support (1).
  6. Switching arrangement according to Claim 1,
    characterized in that
    the entire arc-quenching device (7) is in the form of arc-quenching device elements (8, 9, 10) which are arranged next to one another and have two or more base points (13, 14, 15, 16) for the switching arc.
EP02724107A 2001-04-04 2002-03-12 Switching arrangement for low-voltage circuit breakers Expired - Fee Related EP1374263B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10117844A DE10117844A1 (en) 2001-04-04 2001-04-04 Circuit arrangement for low voltage circuit breakers
DE10117844 2001-04-04
PCT/DE2002/000935 WO2002082482A1 (en) 2001-04-04 2002-03-12 Switching arrangement for low-voltage circuit breakers

Publications (2)

Publication Number Publication Date
EP1374263A1 EP1374263A1 (en) 2004-01-02
EP1374263B1 true EP1374263B1 (en) 2008-05-07

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EP02724107A Expired - Fee Related EP1374263B1 (en) 2001-04-04 2002-03-12 Switching arrangement for low-voltage circuit breakers

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US (1) US6969816B2 (en)
EP (1) EP1374263B1 (en)
JP (1) JP2004523874A (en)
CN (1) CN1230845C (en)
DE (3) DE10117844A1 (en)
HK (1) HK1062355A1 (en)
WO (1) WO2002082482A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102004020654A1 (en) * 2004-04-22 2005-11-10 Siemens Ag Switching contact arrangement
DE102005047740A1 (en) * 2005-09-29 2007-04-05 Siemens Ag Main power supply switchboard has telemetry unit monitoring, e.g. contact force, delay, response time, pole return, selector shaft angle, vibration and temperature
DE102007001471A1 (en) 2007-01-05 2008-07-10 Siemens Ag Electrical switching device for use in low-voltage circuit-breaker, has contact lever linearly guided for closing interfaces during switching movement of lever in point and guided in rotation movement of lever in same point
CN100514525C (en) * 2007-08-08 2009-07-15 常熟开关制造有限公司(原常熟开关厂） Movable contact of circuit breaker
KR101704989B1 (en) * 2015-04-30 2017-02-10 현대중공업 주식회사 Movable contact of circuit breaker

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US5210385A (en) * 1989-07-26 1993-05-11 Merlin Gerin Low voltage circuit breaker with multiple contacts for high currents

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DE19727696B4 (en) 1997-06-20 2007-09-13 Siemens Ag Movable switch contact for low-voltage circuit breaker
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US5994988A (en) * 1997-09-23 1999-11-30 Siemens Energy & Automation, Inc. Movable contact structure for a circuit breaker, including crossbar and spring biased cam mechanism
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DE20100490U1 (en) * 2001-01-05 2001-03-29 Siemens Ag Movable contact carrier for holding contact levers for low-voltage circuit breakers
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US5210385A (en) * 1989-07-26 1993-05-11 Merlin Gerin Low voltage circuit breaker with multiple contacts for high currents

Also Published As

Publication number Publication date
WO2002082482A1 (en) 2002-10-17
US6969816B2 (en) 2005-11-29
EP1374263A1 (en) 2004-01-02
HK1062355A1 (en) 2004-10-29
DE10117844A1 (en) 2002-10-17
CN1230845C (en) 2005-12-07
DE20118493U1 (en) 2002-02-21
US20040094513A1 (en) 2004-05-20
DE50212227D1 (en) 2008-06-19
CN1505824A (en) 2004-06-16
JP2004523874A (en) 2004-08-05

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