EP1017072A2 - Electric commutation device, in particular a circuit breaker - Google Patents

Electric commutation device, in particular a circuit breaker Download PDF

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Publication number
EP1017072A2
EP1017072A2 EP99124510A EP99124510A EP1017072A2 EP 1017072 A2 EP1017072 A2 EP 1017072A2 EP 99124510 A EP99124510 A EP 99124510A EP 99124510 A EP99124510 A EP 99124510A EP 1017072 A2 EP1017072 A2 EP 1017072A2
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EP
European Patent Office
Prior art keywords
arc
distance
contact piece
switching device
wall sections
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.)
Granted
Application number
EP99124510A
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German (de)
French (fr)
Other versions
EP1017072B1 (en
EP1017072A3 (en
Inventor
Bernhard Schulz
Rainer Dipl.-Ing. Ludovici
Andrè Dickgiesser
Joachim Dipl.-Ing. Becker
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ABB AG Germany
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ABB Patent GmbH
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Publication of EP1017072A2 publication Critical patent/EP1017072A2/en
Publication of EP1017072A3 publication Critical patent/EP1017072A3/en
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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
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/346—Details concerning the arc formation chamber
    • 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
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H2009/348—Provisions for recirculation of arcing gasses to improve the arc extinguishing, e.g. move the arc quicker into the arcing chamber
    • 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
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/342—Venting arrangements for arc chutes

Definitions

  • the invention relates to an electrical sound device, in particular a circuit breaker, according to the preamble of claim 1.
  • the quenching device in which the arc is finally extinguished includes several at a distance in an arc quenching plate package arranged arc-quenching plates, which from their facing the contact point Edge outgoing recesses that correspond to the switching task narrow towards the back, i.e. in the direction of the arc, causing the arc can more easily enter the arc extinguishing device.
  • the one in the area of the contact point The prechamber area in front of the arc extinguishing plates is on both sides covered by insulating plates, which are usually made of ceramic; it exists also the possibility that these insulating panels are made of plastic, the at Occurrence of an arc gives off gas, which supports the extinguishing process.
  • This Isolierstoffplatten are arranged at a distance from the housing inner walls, so that a flow around the insulating material plates through the arc gases and beyond pressure equalization is also possible.
  • the two additional insulation panels require in addition to the parts costs, a corresponding assembly effort, so that the There is a desire to save these insulating material plates.
  • the object of the invention is to continue the switching device of the type mentioned improve and without insulation panels an optimal migration of the arc as well to allow pressure equalization in front of and behind the arc.
  • the distance to the quenching plates decreases.
  • the switchgear is provided with arc extinguishing plates, from the prechamber area facing edge a narrowing in the arc running direction recess goes out, then have the wall sections immediately in front of the release plate package one of the clear width of the recess in the edge area equal or slightly closer distance. At this shorter distance everyone can Wall section have a convex curvature to the other wall section, thereby achieving an improvement in the shape of the nozzle.
  • the housing 10 for a circuit breaker is cup-shaped and has a housing wall 11, which extends from walls 12 formed integrally thereon a bowl is added.
  • This bowl has recesses 13 and 14 for receiving a connecting terminal and other impressions that are not important here are.
  • the reference number 15 denotes the rear bottom wall of the assembled Switching device and in the area of the bottom wall 15 there is a prechamber 16 and behind it a room 17 for receiving an arc quenching plate package, the Conclusion by a perpendicular to the bottom wall 15 and the inner surface comb-shaped end wall 18 is completed, in which there are slots 19 which Make exhaust openings for the hot switching gases.
  • the antechamber 16 has an arcuate section 20 from which downstream connects a wall section 21 which runs obliquely and at its in Arc running seen rear end edge 22 a greater distance from the
  • the inner surface of the room 17 has the wall section 20. can the wall section 20 lie in the same plane as the inner surface of the room of the area 17.
  • the area 17 is the inner wall surface of the housing 10.
  • a shoulder 23 In the direction of the arc running seen in front of the wall section 20 is a shoulder 23, which is approximately in the Height of the edge 22; from this paragraph 23 the inner wall falls in a kind of embankment off to section 20; this embankment runs approximately to the edge 22.
  • a Shaped guide wall 25 which surrounds the wall section 20 in a horseshoe shape and has a slot 26 located opposite to the direction of arc travel, which with a space 27 between the wall 25 and one Clamping space 13 final boundary wall 28 is formed. How 2, the wall 25 ends at a certain distance from the bottom wall 15, so that arc gases have a return flow path outside the wall 25 according to arrow direction P is made possible.
  • the section 25a of the wall lying opposite the bottom wall 15 has a recess 32 through which the movable contact lever 33 of the circuit breaker passes through, on which the movable contact piece 34 is attached.
  • the arc baffle extends obliquely within the wall 25 to the inner surface the bottom wall 15 and ends there in an arc guide rail section 29a.
  • Section 29a is followed by the arc-quenching plate stack, not shown in the drawing 35 on; the arc extinguishing plates (see below) run parallel to the arc guide rail section 29a.
  • the arc base point located on the movable contact piece 34 skips or commutates.
  • the resulting on the fixed contact piece 38 The arc base point runs in the direction of arrow P1 to the arc guide rail section 29a and in the arc extinguishing plates 35 in which the arc is extinguished.
  • FIG. 3 shows the configuration of the prechamber space.
  • two housing shells 10 are provided, which are directed towards each other with their walls 12. This creates the antechamber 16, which initially widens greatly over the embankment 24 into itself opposite wall sections 20.
  • the wall sections rise from these 21 on and end in the edges, which, as can be seen from Fig. 3, rounded convex are.
  • wall sections 39 which run vertically and the end of the wall sections 21 form in the direction of the arc extinguisher stack 35.
  • the arc quenching plate package 35 connects is composed of a plurality of arc extinguishing plates which have a cutout 41 have, which start from the edge 40 directed towards the contact point and themselves rejuvenate in it; the front edge section 40 corresponds on both sides to the recess 41 about the height of the edge 22, measured from the bottom 17; it towers over the front one Edge 40 or the edge section that between the wall section 17 and the recess 41 lies.
  • the edges 22 lying immediately in front of the arc-quenching plate stack 35 have the same distance from each other as the clear width of the recesses 41 on the front edge 40 of each baffle. This is located in the area of the wall sections 20 Expansion space is dimensioned so that the movable contact piece 34 at the opening movement crosses this space.
  • the facing the fixed contact piece 38 Side of the expansion space as well as the nozzle-shaped narrowing the arc guide rail 29 limits.
  • the space behind the tongue 37 is with housing material 42 filled in order to prevent the switching gases from escaping at this point, since a corresponding opening commutation of the arc base would hinder from the movable contact piece 34 on the projection 37.
  • the channel 27, as mentioned above, serves as a backflow channel for additional acceleration of the arc. It is crucial that the expansion space begins on the slope directly at the fixed contact piece 38.
  • the height of the room between the recess 32 through which the movable contact lever 33 of the circuit breaker passes through less than the distance that the two edges 22 directly Take in front of the arc extinguishers.
  • a preferred value for the The height of the cutouts 32 is 1.7 mm; the distance between the two opposite one another Edges is preferably 4.5 mm.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Keying Circuit Devices (AREA)

Abstract

The electrical circuit breaker has a movable contact (34) and a fixed contact (38). Coupled to the movable contact is an arc extinguishing rail (29) and a second rail (36) connects with the fixed contact. Located between the rails is an arc extinguishing laminated plate packet (35).

Description

Die Erfindung betrifft ein elektrisches Schallgerät, insbesondere einen Leitungsschutzschalter, nach dem Oberbegriff des Anspruches 1.The invention relates to an electrical sound device, in particular a circuit breaker, according to the preamble of claim 1.

Mit einem derartigen Schaltgerät können Kurzschlußströme abgeschaltet werden, weil der bei einer Ausschalthandlung entstehende Lichtbogen in einer entsprechenden Lichtbogenlöschkammer gelöscht wird. Die Löscheinrichtung, in der der Lichtbogen endgültig gelöscht wird, umfaßt in einem Lichtbogenlöschblechpaket mehrere auf Abstand angeordnete Lichtbogenlöschbleche, die von ihrer der Kontaktstelle zugewandten Kante ausgehende Aussparungen besitzen, die entsprechend der Schaltaufgabe sich nach hinten, also in Lichtbogenlaufrichtung, verengen, wodurch der Lichtbogen leichter in die Lichtbogenlöscheinrichtung einlaufen kann. Der im Bereich der Kontaktstelle vor den Lichtbogenlöschblechen befindliche Vorkammerbereich ist beidseitig mittels durch Isolierstoffplatten abgedeckt, die meist aus Keramik bestehen; es besteht auch die Möglichkeit, daß diese Isolierstoffplatten aus Kunststoff bestehen, der bei Auftreten eines Lichtbogens Gas abgibt, welches den Löschvorgang unterstützt. Diese Isolierstoffplatten sind in Abstand zu den Gehäuseinnenwänden angeordnet, so daß eine Umströmung der Isolierstoffplatten durch die Lichtbogengase und darüber hinaus auch ein Druckausgleich möglich sind. Die beiden zusätzlichen Isolierstoffplatten erfordern außer den Teilekosten auch einen entsprechenden Montageaufwand, so daß der Wunsch besteht, diese Isolierstoffplatten einzusparen.With such a switching device, short-circuit currents can be switched off because the arc that arises during a switch-off operation in a corresponding Arc quenching chamber is extinguished. The quenching device in which the arc is finally extinguished, includes several at a distance in an arc quenching plate package arranged arc-quenching plates, which from their facing the contact point Edge outgoing recesses that correspond to the switching task narrow towards the back, i.e. in the direction of the arc, causing the arc can more easily enter the arc extinguishing device. The one in the area of the contact point The prechamber area in front of the arc extinguishing plates is on both sides covered by insulating plates, which are usually made of ceramic; it exists also the possibility that these insulating panels are made of plastic, the at Occurrence of an arc gives off gas, which supports the extinguishing process. This Isolierstoffplatten are arranged at a distance from the housing inner walls, so that a flow around the insulating material plates through the arc gases and beyond pressure equalization is also possible. The two additional insulation panels require in addition to the parts costs, a corresponding assembly effort, so that the There is a desire to save these insulating material plates.

Aus der FR 2 575 861 B1 ist bekannt, an den Gehäuseinnenwänden der Lichtbogenkammer gegenüberliegende Rippenreihen anzuformen, zwischen denen ein zentraler Kanal bleibt. Bei der Ausbildung dieses Schalters stehen formgestalterische und preßtechnische Maßnahmen im Vordergrund. Eine optimierte Gasrückführung sowie ein schnelles Ablaufen des Lichtbogens von der Kontaktstelle in die Löschkammer sind bei einer solchen Ausgestaltung nicht ohne weiteres gewährleistet.From FR 2 575 861 B1 it is known on the housing inner walls of the arc chamber to form opposite rows of ribs, between which a central Channel remains. The design of this switch involves design and press technology Measures in the foreground. An optimized gas recirculation as well as a rapid arc discharge from the contact point into the quenching chamber are included such an embodiment is not guaranteed.

Aus der EP 0 387 761 B1 ist bekannt, an den Gehäuseinnenwänden an den Lichtbogenlaufschienen dicht anliegende Stege anzuformen; außerdem sind im Vorkammerraum verteilt Säulen bzw. Zapfen angeordnet, die den Lichtbogen seitlich begrenzen. Bei einer Lichtbogenwanderung würde durch die Rückströmung der Gase zwischen den Säulen eine evtl. hemmende Druckdifferenz vor und hinter dem Lichtbogen wirksam ausgeglichen. Durch den Wegfall von Isolierstoffplatten im Vorkammerbereich ergibt sich hierbei eine Kostenersparnis. Jedoch erscheint die Ausgestaltung der Stege und Säulen kompliziert.It is known from EP 0 387 761 B1 on the housing inner walls on the arc guide rails to form tight-fitting webs; are also in the antechamber distributed columns or pins arranged to limit the arc laterally. In the event of an arc migration, the backflow of the gases would between a possibly inhibiting pressure difference in front of and behind the arc balanced. Due to the elimination of insulating material plates in the prechamber area a cost saving. However, the design of the webs appears and pillars complicated.

Aufgabe der Erfindung ist es, das Schaltgerät der eingangs genannten Art weiter zu verbessern und ohne Isolierstoffplatten eine optimale Wanderung des Lichtbogens sowie einen Druckausgleich vor und hinter dem Lichtbogen zu ermöglichen.The object of the invention is to continue the switching device of the type mentioned improve and without insulation panels an optimal migration of the arc as well to allow pressure equalization in front of and behind the arc.

Diese Aufgabe wird erfindungsgemäß gelöst durch die Merkmale des Anspruches 1.This object is achieved according to the invention by the features of claim 1.

Erfindungsgemäß ist der Vorkammerraum von zwei Wandabschnitten der Gehäuseinnenwandungen begrenzt, deren Abstand sich zu den Löschblechen hin verringert.According to the prechamber space of two wall sections of the housing inner walls limited, the distance to the quenching plates decreases.

Entscheidend für diese konstruktive Ausgestaltung ist, daß im Moment der kontaktöffnung und der Entstehung des Lichtbogens zunächst ein großer Expansionsraum zur Verfügung steht, der sich in Richtung der Lichtbogenlöschkammer düsenförmig verengt. Dabei wird ausgenutzt, daß eine Flüssigkeit oder ein Gas in einem engeren Teil einer Röhre schneller strömt, wodurch sich dort der Druck reduziert, wogegen der Druck im erweiterten Teil höher ist. Aufgrund dieser Druckdifferenz wird eine Beschleunigung des Lichtbogens in die Lichtbogenlöschkammer erzielt. Es ist außerdem aus der Literatur bekannt, daß beim Abschaltvorgang im Augenblick der kontakttrennung eine Stoßwelle entsteht, die mit Überschallgeschwindigkeit in Richtung zur Lichtbogenlöschkammer hin läuft und dort an den Löschblechzungen und ggf. auch an einer Verdämmung hinter der Kammer reflektiert wird. Aufgrund der besonderen Ausgestaltung des Vorkammerraumes wird eine bessere Abführung des Gases erreicht.It is crucial for this design that at the moment the contact is opened and the emergence of the arc initially a large expansion space Is available that narrows like a nozzle in the direction of the arc quenching chamber. It takes advantage of the fact that a liquid or a gas in a narrower part of a tube flows faster, which reduces the pressure there, whereas the Pressure in the expanded part is higher. Due to this pressure difference there is an acceleration of the arc in the arc quenching chamber. It is also from the Literature known that when switching off at the moment of contact separation Shock wave occurs, which is at supersonic speed towards the arc quenching chamber runs there and there on the fire-fighting sheet metal tongues and possibly also a dam is reflected behind the chamber. Because of the special design of the pre-chamber space a better discharge of the gas is achieved.

Wenn das Schaltgerät mit Lichtbogenlöschblechen versehen wird, von deren dem Vorkammerraum zugewandten Kante eine sich in Lichtbogenlaufrichtung verengende Aussparung ausgeht, dann besitzen die Wandabschnitte unmittelbar vor dem Lösehblechpaket einen der lichten Weite der Aussparung im Kantenbereich gleichen oder geringfügig geringeren Abstand. In diesem geringeren Abstand kann darüber hinaus jeder Wandungsabschnitt eine zum anderen Wandungsabschnitt konvexe Krümmung aufweisen, wodurch eine Verbesserung der Düsenform erzielt wird.If the switchgear is provided with arc extinguishing plates, from the prechamber area facing edge a narrowing in the arc running direction recess goes out, then have the wall sections immediately in front of the release plate package one of the clear width of the recess in the edge area equal or slightly closer distance. At this shorter distance everyone can Wall section have a convex curvature to the other wall section, thereby achieving an improvement in the shape of the nozzle.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind den weiteren Unteransprüchen zu entnehmen.Further advantageous embodiments of the invention are the further subclaims refer to.

Anhand der Zeichnung, in der ein Ausführungsbeispiel der Erfindung dargestellt ist, sollen die Erfindung sowie weitere vorteilhafte Ausgestaltungen und Verbesserungen der Erfindung näher erläutert und beschrieben werden.Using the drawing, in which an embodiment of the invention is shown, the invention and further advantageous refinements and improvements the invention are explained and described in more detail.

Es zeigen:

Fig. 1
eine Einsicht in ein erfindungsgemäß ausgestattetes Gehäuse,
Fig. 2
eine Einsicht in das Gehäuse mit eingebauten Lichtbogenleitschienen und beweglichem Kontaktstück, und
Fig. 3
eine Schnittansicht gemäß der Schnittlinie III-III.
Show it:
Fig. 1
an insight into a housing equipped according to the invention,
Fig. 2
an insight into the housing with built-in arc guide rails and movable contact piece, and
Fig. 3
a sectional view along the section line III-III.

Das Gehäuse 10 für einen Leitungsschutzschalter ist schalenförmig ausgebildet und besitzt eine Gehäusewand 11, die von an dieser senkrecht angeformten Wänden 12 zu einer Schale ergänzt wird. Diese Schale besitzt Aussparungen 13 und 14 zur Aufnahme einer Anschlußklemme und weitere Einprägungen, die hier nicht von Bedeutung sind. Die Bezugsziffer 15 bezeichnet die hintere Bodenwand des montierten Schaltgerätes und im Bereich der Bodenwand 15 befindet sich ein Vorkammerraum 16 und dahinter ein Raum 17 zur Aufnahme eines Lichtbogenlöschblechpaketes, deren Abschluß durch eine senkrecht zur Bodenwandung 15 und zur Innenfläche verlaufende kammförmige Abschlußwand 18 abgeschlossen ist, in der sich Schlitze 19 befinden, die für die heißen Schaltgase Auspufföffnungen bilden.The housing 10 for a circuit breaker is cup-shaped and has a housing wall 11, which extends from walls 12 formed integrally thereon a bowl is added. This bowl has recesses 13 and 14 for receiving a connecting terminal and other impressions that are not important here are. The reference number 15 denotes the rear bottom wall of the assembled Switching device and in the area of the bottom wall 15 there is a prechamber 16 and behind it a room 17 for receiving an arc quenching plate package, the Conclusion by a perpendicular to the bottom wall 15 and the inner surface comb-shaped end wall 18 is completed, in which there are slots 19 which Make exhaust openings for the hot switching gases.

Der Vorkammerraum 16 besitzt einen kreisbogenförmigen Abschnitt 20, von dem aus stromabwärts ein Wandabschnitt 21 anschließt, der schräg verläuft und an seiner in Lichtbogenlaufrichtung gesehen hinteren Endkante 22 einen größeren Abstand von der Innenfläche des Raumes 17 besitzt als der Wandabschnitt 20. Ggf. kann der Wandabschnitt 20 in der gleichen Ebene liegen wie die Innenfläche des Raumes des Bereiches 17. Der Bereich 17 ist die Innenwandfläche des Gehäuses 10. In Lichtbogenlaufrichtung gesehen vor dem Wandabschnitt 20 befindet sich ein Absatz 23, der etwa in der Höhe der Kante 22 liegt; von diesem Absatz 23 fällt die Innenwandung in einer Art Böschung ab zum Abschnitt 20; diese Böschung verläuft etwa bis zur Kante 22. An den Absatz 23, auf dessen dem Wandabschnitt 20 entgegengesetzt liegenden Ende ist eine Führungswandung 25 angeformt, die den Wandabschnitt 20 hufeisenförmig umgibt und einen entgegengesetzt zur Lichtbogenlaufrichtung befindlichen Schlitz 26 aufweist, der mit einem Zwischenraum 27 zwischen der Wandung 25 und einer den Klemmenaufnahmeraum 13 abschließenden Begrenzungswand 28 gebildet ist. Wie aus Fig. 2 ersichtlich ist, endet die Wandung 25 in bestimmtem Abstand von der Bodenwand 15, so daß Lichtbogengasen ein Rückströmweg außerhalb der Wandung 25 gemäß Pfeilrichtung P ermöglicht wird. The antechamber 16 has an arcuate section 20 from which downstream connects a wall section 21 which runs obliquely and at its in Arc running seen rear end edge 22 a greater distance from the The inner surface of the room 17 has the wall section 20. can the wall section 20 lie in the same plane as the inner surface of the room of the area 17. The area 17 is the inner wall surface of the housing 10. In the direction of the arc running seen in front of the wall section 20 is a shoulder 23, which is approximately in the Height of the edge 22; from this paragraph 23 the inner wall falls in a kind of embankment off to section 20; this embankment runs approximately to the edge 22. On the Paragraph 23, on the end opposite the wall section 20 is a Shaped guide wall 25 which surrounds the wall section 20 in a horseshoe shape and has a slot 26 located opposite to the direction of arc travel, which with a space 27 between the wall 25 and one Clamping space 13 final boundary wall 28 is formed. How 2, the wall 25 ends at a certain distance from the bottom wall 15, so that arc gases have a return flow path outside the wall 25 according to arrow direction P is made possible.

Auf den Absatz 23 kommt eine Lichtbogenleitschiene 29 zu liegen, die mit einer Anschlußklemme 30 verbunden ist, wobei der Verbindungsabschnitt 31 durch den Schlitz 26 hindurchgelangt.On the paragraph 23 there is an arc guide rail 29, which has a connecting terminal 30 is connected, the connecting portion 31 through the slot 26 got through.

Der der Bodenwand 15 entgegengesetzt liegende Abschnitt 25a der Wandung besitzt eine Aussparung 32, durch die der bewegliche Kontakthebel 33 des Leitungsschutzschalters hindurchgreift, an dem das bewegliche Kontaktstück 34 angebracht ist.The section 25a of the wall lying opposite the bottom wall 15 has a recess 32 through which the movable contact lever 33 of the circuit breaker passes through, on which the movable contact piece 34 is attached.

Das Lichtbogenleitblech verläuft innerhalb der Wandung 25 schräg hin bis zur Innenfläche der Bodenwand 15 und endet dort in einem Lichtbogenleitschienenabschnitt 29a.The arc baffle extends obliquely within the wall 25 to the inner surface the bottom wall 15 and ends there in an arc guide rail section 29a.

An den Abschnitt 29a schließt sich das in der Zeichnung nicht näher dargestellte Lichtbogenlöschblechpaket 35 an; die Lichtbogenlöschbleche (siehe weiter unten) verlaufen parallel zum Lichtbogenleitschienenabschnitt 29a. Am entgegengesetzten Ende des Lichtbogenlöschblechpaketes 35 befindet sich eine weitere Lichtbogenleitschiene 36, an der ein in den Vorkammerraum hineinragender Vorsprung 37 angeformt ist, auf den bei einer Ausschalthandlung der am beweglichen Kontaktstück 34 befindliche Lichtbogenfußpunkt überspringt bzw. kommutiert. Der am festen Kontaktstück 38 entstehende Lichtbogenfußpunkt läuft in Pfeilrichtung P1 zum Lichtbogenleitschienenabschnitt 29a und in die Lichtbogenlöschbleche 35, in denen der Lichtbogen gelöscht wird.Section 29a is followed by the arc-quenching plate stack, not shown in the drawing 35 on; the arc extinguishing plates (see below) run parallel to the arc guide rail section 29a. At the opposite end of the Arc quenching plate package 35 there is a further arc guide rail 36, on which a projection 37 protruding into the prechamber space is formed, onto which in the event of a switch-off action, the arc base point located on the movable contact piece 34 skips or commutates. The resulting on the fixed contact piece 38 The arc base point runs in the direction of arrow P1 to the arc guide rail section 29a and in the arc extinguishing plates 35 in which the arc is extinguished.

Die Fig. 3 zeigt die Ausgestaltung des Vorkammerraumes. Im montierten Zustand, wenn das Schaltgerät zusammengebaut ist, sind zwei Gehäuseschalen 10 vorgesehen, die mit ihren Wandungen 12 gegeneinander gerichtet sind. Dadurch entsteht der Vorkammerraum 16, der sich über die Böschung 24 zunächst stark erweitert bis in die sich gegenüberliegenden Wandabschnitte 20. Von diesen aus steigen die Wandabschnitte 21 an und enden in den Kanten, die, wie aus Fig. 3 ersichtlich ist, konvex abgerundet sind. Daran schließen sich Wandabschnitte 39 an, die senkrecht verlaufen und den Abschluß der Wandabschnitte 21 in Richtung zum Lichtbogenlöschblechpaket 35 bilden. An diesen Wandabschluß 39 schließt sich das Lichtbogenlöschblechpaket 35 an, das aus mehreren Lichtbogenlöschblechen zusammengesetzt ist, die eine Aussparung 41 besitzen, die von der zur Kontaktstelle hin gerichteten Kante 40 ausgehen und sich darin verjüngen; der vorder Kantenabschnitt 40 beidseitig zur Aussparung 41 entspricht etwa der Höhe der Kante 22, gemessen vom Boden 17 aus; er überragt die vordere Kante 40 bzw. den Kantenabschnitt, der zwischen dem Wandabschnitt 17 und der Aussparung 41 liegt.3 shows the configuration of the prechamber space. When assembled, if the switching device is assembled, two housing shells 10 are provided, which are directed towards each other with their walls 12. This creates the antechamber 16, which initially widens greatly over the embankment 24 into itself opposite wall sections 20. The wall sections rise from these 21 on and end in the edges, which, as can be seen from Fig. 3, rounded convex are. This is followed by wall sections 39 which run vertically and the end of the wall sections 21 form in the direction of the arc extinguisher stack 35. At this wall termination 39, the arc quenching plate package 35 connects is composed of a plurality of arc extinguishing plates which have a cutout 41 have, which start from the edge 40 directed towards the contact point and themselves rejuvenate in it; the front edge section 40 corresponds on both sides to the recess 41 about the height of the edge 22, measured from the bottom 17; it towers over the front one Edge 40 or the edge section that between the wall section 17 and the recess 41 lies.

Die unmittelbar vor dem Lichtbogenlöschblechpaket 35 liegenden Kanten 22 besitzen einen gleichen Abstand voneinander wie die lichte Weite der Aussparungen 41 an der vorderen Kante 40 jedes Löschbleches. Dieser im Bereich der Wandabschnitte 20 befindliche Expansionsraum ist so bemessen, daß das bewegliche Kontaktstück 34 bei der Öffnungsbewegung diesen Raum durchquert. Die dem Festkontaktstück 38 zugewandte Seite des Expansionsraumes sowie die düsenförmige Verengung werden durch die Lichtbogenleitschiene 29 begrenzt. Der Raum hinter der Zunge 37 ist mit Gehäusematerial 42 angefüllt, um ein Ausströmen der Schaltgase an dieser Stelle zu verhindern, da eine entsprechende Öffnung die Kommutierung des Lichtbogenfußpunktes vom beweglichen Kontaktstück 34 auf den Vorsprung 37 behindern würde. Der Kanal 27 dient, wie oben erwähnt, als Rückströmungskanal, der für eine zusätzliche Beschleunigung des Lichtbogens sorgt. Entscheidend ist dabei, daß der Expansionsraum über die Böschung unmittelbar am Festkontaktstück 38 beginnt.The edges 22 lying immediately in front of the arc-quenching plate stack 35 have the same distance from each other as the clear width of the recesses 41 on the front edge 40 of each baffle. This is located in the area of the wall sections 20 Expansion space is dimensioned so that the movable contact piece 34 at the opening movement crosses this space. The facing the fixed contact piece 38 Side of the expansion space as well as the nozzle-shaped narrowing the arc guide rail 29 limits. The space behind the tongue 37 is with housing material 42 filled in order to prevent the switching gases from escaping at this point, since a corresponding opening commutation of the arc base would hinder from the movable contact piece 34 on the projection 37. The channel 27, as mentioned above, serves as a backflow channel for additional acceleration of the arc. It is crucial that the expansion space begins on the slope directly at the fixed contact piece 38.

Bei einer besonders günstigen Ausgestaltung der Erfindung ist die Höhe des Raumes zwischen der Aussparung 32, durch die der bewegliche Kontakthebel 33 des Leitungsschutzschalters hindurchgreift, geringer als der Abstand, den die beiden Kanten 22 unmittelbar vor den Lichtbogenlöschblechen einnehmen. Ein bevorzugter Wert für die Höhe der Aussparungen 32 beträgt 1,7 mm; der Abstand der beiden sich gegenüberliegenden Kanten beträgt in bevorzugter Weise 4,5 mm.In a particularly favorable embodiment of the invention, the height of the room between the recess 32 through which the movable contact lever 33 of the circuit breaker passes through, less than the distance that the two edges 22 directly Take in front of the arc extinguishers. A preferred value for the The height of the cutouts 32 is 1.7 mm; the distance between the two opposite one another Edges is preferably 4.5 mm.

Claims (6)

Elektrisches Schaltgerät, insbesondere Leitungsschutzschalter, mit einer Kontaktstelle mit beweglichem Kontaktstück und feststehendem Kontaktstück, mit einer sich an das feststehende Kontaktstück anschließenden ersten Lichtbogenleitschiene und mit einer zweiten Lichtbogenleitschiene, die an das bewegliche Kontaktstück in dessen Ausschaltstellung anschließt, mit einem zwischen den Lichtbogenleitschienen befindlichen Lichtbogenlöschblechpaket, in das der Lichtbogen beim Ausschalten hineinläuft und darin gelöscht wird, und mit einem Vorkammerraum, dadurch gekennzeichnet, daß der Vorkammerraum von zwei Wandabschnitten (20, 21) begrenzt ist, deren Abstand sich zu den Löschblechen (35) hin verringert.Electrical switching device, in particular line circuit breaker, with a contact point with a movable contact piece and a fixed contact piece, with a first arc guide rail adjoining the fixed contact piece and with a second arc guide rail which connects to the movable contact piece in its switched-off position, with an arc-quenching plate package located between the arc guide rails, into which the arc runs when it is switched off and is extinguished therein, and with a prechamber space, characterized in that the prechamber space is delimited by two wall sections (20, 21), the distance between which is reduced from the quenching plates (35). Schallgerät nach Anspruch 1, dadurch gekennzeichnet, daß die Wandabschnitte im Bereich der Kontaktstelle einen maximalen Abstand voneinander haben, so daß ein großer Expansionsraum für den Lichtbogen gebildet ist.Sound device according to claim 1, characterized in that the wall sections have a maximum distance from each other in the area of the contact point, so that a large expansion space for the arc is formed. Schaltgerät nach Anspruch 1 oder 2, mit Lichtbogenlöschblechen, von deren dem Vorkammerraum zugewandten Kante eines sich in Lichtbogenlaufrichtung verengende Aussparung anschließt, dadurch gekennzeichnet, daß die Wandabschnitte im Löschblechbereich der lichten Weite der Aussparungen der Löschbleche am Kantenbereich gleichen oder geringfügig geringeren Abstand voneinander besitzen.Switching device according to claim 1 or 2, with arc extinguishing plates, of which the antechamber facing edge of a narrowing in the direction of the arc Recess connects, characterized in that the wall sections in Extinguishing sheet area of the clear width of the cutouts of the extinguishing sheets at the edge area have the same or slightly smaller distance from each other. Schaltgerät nach Anspruch 3, dadurch gekennzeichnet, daß die an die vordere Kante der Lichtbogenlöschbleche anschließenden Wandabschnitte (21, 39) eine aufeinanderzu konvexe Krümmung aufweisen. Switching device according to claim 3, characterized in that the to the front Edge of the arc extinguishing plates adjoining wall sections (21, 39) have a convex curvature towards one another. Schaltgerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß der Vorkammerraum im Bewegungsbereich des beweglichen Kontaktstückes durch die etwa kreisförmigen Wandabschnitte (20) begrenzt ist, deren Abstand voneinander etwa der Höhe des Lichtbogenlöschblechpaketes senkrecht zur Wandinnenfläche des Gehäues entspricht.Switching device according to one of the preceding claims, characterized in that that the antechamber in the range of motion of the movable contact piece the approximately circular wall sections (20) is limited, their distance from one another about the height of the arc quenching plate package perpendicular to the inner wall surface of the Housing corresponds. Schaltgerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Höhe der Aussparung (32), durch die der Kontakthebel (33) hindurchgreift, geringer ist als der Abstand der beiden Kanten (22) unmittelbar vor dem Löschblechbereich.Switching device according to one of the preceding claims, characterized in that that the height of the recess (32) through which the contact lever (33) passes, less is the distance between the two edges (22) immediately in front of the area of the fire-fighting sheet.
EP99124510A 1998-12-28 1999-12-09 Electric commutation device, in particular a circuit breaker Revoked EP1017072B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19860427A DE19860427B4 (en) 1998-12-28 1998-12-28 Electrical switching device, in particular circuit breaker
DE19860427 1998-12-28

Publications (3)

Publication Number Publication Date
EP1017072A2 true EP1017072A2 (en) 2000-07-05
EP1017072A3 EP1017072A3 (en) 2001-07-18
EP1017072B1 EP1017072B1 (en) 2007-01-24

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EP99124510A Revoked EP1017072B1 (en) 1998-12-28 1999-12-09 Electric commutation device, in particular a circuit breaker

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EP (1) EP1017072B1 (en)
AT (1) ATE352852T1 (en)
DE (2) DE19860427B4 (en)

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WO2002075760A1 (en) * 2001-03-20 2002-09-26 Moeller Gebäudeautomation KG Housing for a switching device
EP2804189A1 (en) 2013-05-17 2014-11-19 Schneider Electric Industries SAS Arc extinguising chamber for an electric protection apparatus and electric protection apparatus comprising same

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DE10131560C1 (en) * 2001-06-29 2003-02-06 Aeg Niederspannungstech Gmbh Blow-out system for a plug-in component
EP1876617A1 (en) * 2006-07-06 2008-01-09 ABB PATENT GmbH Electrical installation switch with pre-arcing chamber, arcing horns and current limiting arc chute
DE102008039152B4 (en) * 2008-08-21 2019-02-14 Siemens Aktiengesellschaft Arc-extinguishing device
US8164018B2 (en) * 2009-03-23 2012-04-24 Siemens Industry, Inc. Circuit breaker arc chambers and methods for operating same
DE102011090052A1 (en) * 2011-12-28 2013-07-04 Siemens Aktiengesellschaft Electrical switching device, in particular molded case circuit breaker

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US3632926A (en) * 1970-04-20 1972-01-04 Gen Electric Current-limiting circuit breaker having arc extinguishing means which includes improved arc initiation and extinguishing chamber construction
CH521017A (en) * 1970-06-13 1972-03-31 Siemens Ag Electric switch
FR2575861A1 (en) * 1985-01-07 1986-07-11 Merlin Gerin Miniature electric circuit breaker with arc forming chamber
DE3619241A1 (en) * 1986-06-07 1987-12-10 Kloeckner Moeller Elektrizit Extinguishing device for a line protection circuit breaker
EP0387761A2 (en) * 1989-03-13 1990-09-19 Licentia Patent-Verwaltungs-GmbH Automatic circuit breaker, particularly automatic cut-out

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US3632926A (en) * 1970-04-20 1972-01-04 Gen Electric Current-limiting circuit breaker having arc extinguishing means which includes improved arc initiation and extinguishing chamber construction
CH521017A (en) * 1970-06-13 1972-03-31 Siemens Ag Electric switch
FR2575861A1 (en) * 1985-01-07 1986-07-11 Merlin Gerin Miniature electric circuit breaker with arc forming chamber
DE3619241A1 (en) * 1986-06-07 1987-12-10 Kloeckner Moeller Elektrizit Extinguishing device for a line protection circuit breaker
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Cited By (5)

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WO2002075760A1 (en) * 2001-03-20 2002-09-26 Moeller Gebäudeautomation KG Housing for a switching device
CZ301531B6 (en) * 2001-03-20 2010-04-07 Moeller Gebäudeautomation KG Housing having two half-shells for a switching device
EP2804189A1 (en) 2013-05-17 2014-11-19 Schneider Electric Industries SAS Arc extinguising chamber for an electric protection apparatus and electric protection apparatus comprising same
US9362070B2 (en) 2013-05-17 2016-06-07 Schneider Electric Industries Sas ARC extinguishing chamber for an electric protection apparatus and electric protection apparatus comprising same
RU2649969C2 (en) * 2013-05-17 2018-04-06 Шнейдер Электрик Эндюстри Сас Arc extinguishing chamber for electrical protection device and electrical protection equipment comprising same

Also Published As

Publication number Publication date
ATE352852T1 (en) 2007-02-15
DE19860427A1 (en) 2000-06-29
EP1017072B1 (en) 2007-01-24
DE59914169D1 (en) 2007-03-15
DE19860427B4 (en) 2006-08-03
EP1017072A3 (en) 2001-07-18

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