EP1017072B1 - 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
EP1017072B1
EP1017072B1 EP99124510A EP99124510A EP1017072B1 EP 1017072 B1 EP1017072 B1 EP 1017072B1 EP 99124510 A EP99124510 A EP 99124510A EP 99124510 A EP99124510 A EP 99124510A EP 1017072 B1 EP1017072 B1 EP 1017072B1
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EP
European Patent Office
Prior art keywords
arc
switching device
arc splitter
wall sections
contact piece
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.)
Revoked
Application number
EP99124510A
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German (de)
French (fr)
Other versions
EP1017072A3 (en
EP1017072A2 (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 switching device, in particular a circuit breaker, according to the preamble of claim 1.
  • the extinguishing device in which the arc is permanently extinguished, comprises in an arc splitter stack a plurality of spaced arc extinguishing plates which have emanating from their edge facing the contact point, which narrow according to the switching task to the rear, ie in the arc running direction, whereby the arc easier can run into the arc quenching device.
  • the pre-chamber area located in the region of the contact point in front of the arc-quenching plates is covered on both sides by means of insulating plates, which are usually made of ceramic; There is also the possibility that these insulating panels are made of plastic, which emits gas when an arc occurs, which supports the deletion process. These insulating plates are arranged at a distance from the housing inner walls, so that a flow around the Isolierstoffplatten by the arc gases and beyond also a pressure compensation are possible. The two additional insulating require in addition to the cost of parts and a corresponding installation effort, so that there is a desire to save these insulating panels.
  • the document CH-A-521 017 also discloses such a switching device, wherein the cross section of the quenching channel has the shape of a Loval nozzle.
  • the object of the invention is to further improve the switching device of the type mentioned and to allow without Isolierstoffplatten optimal migration of the arc and pressure equalization in front of and behind the arc.
  • the pre-chamber space is delimited by two wall sections of the inner walls of the housing, whose spacing decreases towards the quenching plates.
  • each wall portion may have a convex curvature to the other wall portion, thereby improving the nozzle shape.
  • the housing 10 for a circuit breaker is cup-shaped and has a housing wall 11, which is supplemented by at this vertically formed walls 12 to a shell.
  • This shell has recesses 13 and 14 for receiving a terminal and other impressions, which are not significant here.
  • the reference numeral 15 denotes the rear bottom wall of the mounted switching device and in the region of the bottom wall 15 is a Vorschraum 16 and behind a space 17 for receiving an arc splitter stack whose completion is completed by a perpendicular to the bottom wall 15 and the inner surface extending comb-shaped end wall 18, in the slots 19 are located, which form exhaust ports for the hot switching gases.
  • the pre-chamber space 16 has a circular arc-shaped portion 20, downstream of which a wall portion 21 connects, which extends obliquely and seen at its arc in the rear end edge 22 has a greater distance from the inner surface of the space 17 than the wall portion 20.
  • Ggf. can the wall portion 20 lie in the same plane as the inner surface of the space of the area 17.
  • the area 17 is the inner wall surface of the housing 10.
  • a shoulder 23 In the arc running direction in front of the wall portion 20 is a shoulder 23 which is located approximately at the level of the edge 22 ; from this paragraph 23, the inner wall falls in a kind of slope from the section 20; this slope extends approximately to the edge 22.
  • a guide wall 25 which surrounds the wall portion 20 horseshoe-shaped and has a direction opposite to the arc running slot 26 having a gap 27 between the wall 25 and a terminal receiving space 13 final boundary wall 28 is formed.
  • the wall 25 terminates at a certain distance from the bottom wall 15, so that arc gases a remindströmweg outside the wall 25 according to arrow P is made possible.
  • an arc guide rail 29 is located, which is connected to a terminal 30, wherein the connecting portion 31 passes through the slot 26.
  • the bottom wall 15 opposite portion 25a of the wall has a recess 32 through which passes through the movable contact lever 33 of the circuit breaker to which the movable contact piece 34 is attached.
  • the arc guide plate extends within the wall 25 obliquely up to the inner surface of the bottom wall 15 and ends there in an arc guide rail portion 29 a.
  • the section 29a is followed by the arc splitter stack 35 (not shown in detail in the drawing); the arc quenching plates (see below) extend parallel to the arc guide rail section 29a.
  • the arc splitter stack 35 At the opposite end of the arc splitter stack 35 is another arc guide rail 36, on which a protuberance projecting into the prechamber space 37 is formed, onto which the arc base located at the movable contact piece 34 jumps or commutes.
  • the resulting on the fixed contact 38 Lichtbogenfußddling runs in the direction of arrow P1 to the Lichtbogenleitschienenabêt 29a and in the arc quenching plates 35, in which the arc is deleted.
  • FIG. 3 shows the embodiment of the prechamber space.
  • two housing shells 10 are provided, which are directed with their walls 12 against each other. This results in the pre-chamber space 16, which initially greatly extends over the slope 24 into the opposite wall sections 20. From these, the wall sections 21 rise and end in the edges, which, as shown in FIG. 3, are convexly rounded , This is followed by wall sections 39, which run vertically and form the termination of the wall sections 21 in the direction of the arc splitter stack 35.
  • the arc splitter plate package 35 connects, which is composed of a plurality of arc extinguishing plates, which has a recess 41st which emanate from the edge 40 directed towards the contact point and taper in it; the front edge portion 40 on both sides of the recess 41 corresponds approximately to the height of the edge 22, measured from the bottom 17; it projects beyond the front edge 40 or the edge portion which lies between the wall portion 17 and the recess 41.
  • the edges 22 lying directly in front of the arc splitter stack 35 are at the same distance from each other as the clear width of the recesses 41 at the front edge 40 of each quenching plate.
  • This located in the wall portions 20 expansion space is dimensioned so that the movable contact piece 34 passes through this space during the opening movement.
  • the fixed contact piece 38 facing side of the expansion space and the nozzle-shaped constriction are limited by the arc guide rail 29.
  • the space behind the tongue 37 is filled with housing material 42 to prevent escape of the switching gases at this point, since a corresponding opening would hinder the commutation of the arc root of the movable contact piece 34 on the projection 37.
  • the channel 27 serves, as mentioned above, as a return flow channel, which provides for an additional acceleration of the arc. It is crucial that the expansion space begins on the slope directly on the fixed contact 38.
  • the height of the space between the recess 32 through which the movable contact lever 33 of the circuit breaker passes is less than the distance occupied by the two edges 22 immediately before the arc extinguishing plates.
  • a preferred value for the height of the recesses 32 is 1.7 mm; The distance between the two opposite 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 Schaltgerät, insbesondere einen Leitungsschutzschalter, nach dem Oberbegriff des Anspruches 1.The invention relates to an electrical switching 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 turned off because of the arc resulting from a turn-off is deleted in a corresponding arc extinguishing chamber. The extinguishing device, in which the arc is permanently extinguished, comprises in an arc splitter stack a plurality of spaced arc extinguishing plates which have emanating from their edge facing the contact point, which narrow according to the switching task to the rear, ie in the arc running direction, whereby the arc easier can run into the arc quenching device. The pre-chamber area located in the region of the contact point in front of the arc-quenching plates is covered on both sides by means of insulating plates, which are usually made of ceramic; There is also the possibility that these insulating panels are made of plastic, which emits gas when an arc occurs, which supports the deletion process. These insulating plates are arranged at a distance from the housing inner walls, so that a flow around the Isolierstoffplatten by the arc gases and beyond also a pressure compensation are possible. The two additional insulating require in addition to the cost of parts and a corresponding installation effort, so that there is a desire to save these insulating panels.

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 to form rib rows opposite the housing inner walls of the arc chamber, between which a central channel remains. In the design of this switch formgestalterische and Preßtechnische measures are in the foreground. An optimized gas recirculation and a rapid running of the arc from the contact point into the quenching chamber are not readily ensured in such an embodiment.

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.From EP 0 387 761 B1 it is known to form tightly arranged webs on the housing inner walls on the arc runners; In addition, columns or pins are arranged distributed in the antechamber space, which limit the arc laterally. During an arc migration, the backflow of the gases between the columns would effectively compensate for any inhibiting pressure difference in front of and behind the arc. The elimination of insulating material in Vorkammerbereich this results in a cost savings. However, the design of the webs and columns seems complicated.

Das Dokument CH-A-521 017 offenbart ebenfalls ein derartiges Schaltgerät, wobei der Querschnitt des Löschkanals die Form einer Loval-Düse hat.The document CH-A-521 017 also discloses such a switching device, wherein the cross section of the quenching channel has the shape of a Loval nozzle.

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 further improve the switching device of the type mentioned and to allow without Isolierstoffplatten optimal migration of the arc and pressure equalization in front of and behind the arc.

Diese Aufgabe wird erfindungsgemäß gelöst durch die Merkmale des Anspruches 1.This object is achieved 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 invention, the pre-chamber space is delimited by two wall sections of the inner walls of the housing, whose spacing decreases towards the quenching plates.

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.Critical to this structural design is that at the moment the contact opening and the emergence of the arc initially a large expansion space is available, which narrows nozzle-shaped in the direction of the arc extinguishing chamber. It is exploited that a liquid or gas flows faster in a narrower part of a tube, whereby there reduces the pressure, whereas the pressure in the extended part is higher. Due to this pressure difference, an acceleration of the arc is achieved in the arc extinguishing chamber. It is also known from the literature that the shutdown at the moment of contact separation creates a shock wave, which runs at supersonic speed toward the arc extinguishing chamber and is reflected there on the splitter tabs and possibly also on a damming behind the chamber. Due to the special design of the pre-chamber space a better removal 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 Löschblechpaket 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 switching device is provided with arc extinguishing plates, from the edge facing the prechamber space extending in the arc running direction recess, then have the wall sections immediately before the splitter stack one of the clear width of the recess in the edge region same or slightly smaller distance. In addition, at this smaller distance, each wall portion may have a convex curvature to the other wall portion, thereby improving the nozzle shape. -

Weitere vorteilhafte Ausgestaltungen der Erfindung sind den weiteren Unteransprüchen zu entnehmen.Further advantageous embodiments of the invention can be found in the further subclaims.

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.Reference to the drawing, in which an embodiment of the invention is shown, the invention and further advantageous refinements and improvements of the invention will be explained and described in 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 is supplemented by at this vertically formed walls 12 to a shell. This shell has recesses 13 and 14 for receiving a terminal and other impressions, which are not significant here. The reference numeral 15 denotes the rear bottom wall of the mounted switching device and in the region of the bottom wall 15 is a Vorkammerraum 16 and behind a space 17 for receiving an arc splitter stack whose completion is completed by a perpendicular to the bottom wall 15 and the inner surface extending comb-shaped end wall 18, in the slots 19 are located, which form exhaust ports 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 pre-chamber space 16 has a circular arc-shaped portion 20, downstream of which a wall portion 21 connects, which extends obliquely and seen at its arc in the rear end edge 22 has a greater distance from the inner surface of the space 17 than the wall portion 20. Ggf. can the wall portion 20 lie in the same plane as the inner surface of the space of the area 17. The area 17 is the inner wall surface of the housing 10. In the arc running direction in front of the wall portion 20 is a shoulder 23 which is located approximately at the level of the edge 22 ; from this paragraph 23, the inner wall falls in a kind of slope from the section 20; this slope extends approximately to the edge 22. At the shoulder 23, on the opposite wall portion 20 of the end of a guide wall 25 is formed, which surrounds the wall portion 20 horseshoe-shaped and has a direction opposite to the arc running slot 26 having a gap 27 between the wall 25 and a terminal receiving space 13 final boundary wall 28 is formed. As is apparent from Fig. 2, the wall 25 terminates at a certain distance from the bottom wall 15, so that arc gases a Rückströmweg outside the wall 25 according to arrow 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 shoulder 23 is an arc guide rail 29 is located, which is connected to a terminal 30, wherein the connecting portion 31 passes through the slot 26.

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 bottom wall 15 opposite portion 25a of the wall has a recess 32 through which passes through the movable contact lever 33 of the circuit breaker to 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 guide plate extends within the wall 25 obliquely up to the inner surface of the bottom wall 15 and ends there in an arc guide rail portion 29 a.

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.The section 29a is followed by the arc splitter stack 35 (not shown in detail in the drawing); the arc quenching plates (see below) extend parallel to the arc guide rail section 29a. At the opposite end of the arc splitter stack 35 is another arc guide rail 36, on which a protuberance projecting into the prechamber space 37 is formed, onto which the arc base located at the movable contact piece 34 jumps or commutes. The resulting on the fixed contact 38 Lichtbogenfußpunkt runs in the direction of arrow P1 to the Lichtbogenleitschienenabschnitt 29a and in the arc quenching plates 35, in which the arc is deleted.

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 embodiment of the prechamber space. In the assembled state, when the switching device is assembled, two housing shells 10 are provided, which are directed with their walls 12 against each other. This results in the pre-chamber space 16, which initially greatly extends over the slope 24 into the opposite wall sections 20. From these, the wall sections 21 rise and end in the edges, which, as shown in FIG. 3, are convexly rounded , This is followed by wall sections 39, which run vertically and form the termination of the wall sections 21 in the direction of the arc splitter stack 35. At this wall termination 39, the arc splitter plate package 35 connects, which is composed of a plurality of arc extinguishing plates, which has a recess 41st which emanate from the edge 40 directed towards the contact point and taper in it; the front edge portion 40 on both sides of the recess 41 corresponds approximately to the height of the edge 22, measured from the bottom 17; it projects beyond the front edge 40 or the edge portion which lies between the wall portion 17 and the recess 41.

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 directly in front of the arc splitter stack 35 are at the same distance from each other as the clear width of the recesses 41 at the front edge 40 of each quenching plate. This located in the wall portions 20 expansion space is dimensioned so that the movable contact piece 34 passes through this space during the opening movement. The fixed contact piece 38 facing side of the expansion space and the nozzle-shaped constriction are limited by the arc guide rail 29. The space behind the tongue 37 is filled with housing material 42 to prevent escape of the switching gases at this point, since a corresponding opening would hinder the commutation of the arc root of the movable contact piece 34 on the projection 37. The channel 27 serves, as mentioned above, as a return flow channel, which provides for an additional acceleration of the arc. It is crucial that the expansion space begins on the slope directly on the fixed contact 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 advantageous embodiment of the invention, the height of the space between the recess 32 through which the movable contact lever 33 of the circuit breaker passes, is less than the distance occupied by the two edges 22 immediately before the arc extinguishing plates. A preferred value for the height of the recesses 32 is 1.7 mm; The distance between the two opposite edges is preferably 4.5 mm.

Claims (6)

  1. Electrical switching device, in particular line circuit breaker, having a contact point having a moveable contact piece (34) and a stationary contact piece (38), having a first arc guide rail (29), which adjoins the stationary contact piece, and having a second arc guide.rail (36), which adjoins the moveable contact piece in its switch-off position, having an arc splitter stack (35), which is located between the arc guide rails, the arc running into said arc splitter stack during switch-off and being quenched therein, and having a prechamber space (12), which is arranged between the contact point and the arc splitter stack (35), characterized in that the prechamber space is delimited by two wall sections (20, 21), whose distance from one another decreases towards the arc splitter plates (35).
  2. Switching device according to Claim 1, characterized in that the wall sections have a maximum distance from one another in the region of the contact point, with the result that a large expansion space is formed for the arc.
  3. Switching device according to Claim 1 or 2, having arc splitter plates, from whose edge facing the prechamber space adjoins a cutout tapering in the running direction of the arc, characterized in that, in the arc splitter plate region, the wall sections have a distance from one another which is equal to or slightly smaller than the clear width of the cutouts in the arc splitter plates at the edge region.
  4. Switching device according to Claim 3, characterized in that the wall sections (21, 39) adjoining the front edge of the arc splitter plates have a convex curvature towards one another.
  5. Switching device according to one of the preceding claims, characterized in that the prechamber space is delimited in the movement region of the moveable contact piece by the approximately circular wall sections (20), whose distance from one another approximately corresponds to the height of the arc splitter stack at right angles to the wall inner face of the housing.
  6. Switching device according to one of the preceding claims, characterized in that the height of the cutout (32) through which the contact lever (33) passes is smaller than the distance between the two edges (22) directly in front of the arc splitter plate region.
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 EP1017072A2 (en) 2000-07-05
EP1017072A3 EP1017072A3 (en) 2001-07-18
EP1017072B1 true EP1017072B1 (en) 2007-01-24

Family

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Application Number Title Priority Date Filing Date
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)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT411502B (en) * 2001-03-20 2004-01-26 Moeller Gebaeudeautomation Kg HOUSING FOR A SWITCHGEAR
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
FR3005781B1 (en) * 2013-05-17 2016-09-23 Schneider Electric Ind Sas CUTTING CHAMBER FOR ELECTRICAL PROTECTION APPARATUS AND ELECTRICAL PROTECTION APPARATUS HAVING THE SAME.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE7022279U (en) * 1970-06-13 1971-09-09 Siemens Ag Electric switch
FR2575861B1 (en) * 1985-01-07 1987-01-16 Merlin Gerin MINIATURE ELECTRIC CIRCUIT BREAKER WITH ARC FORMING CHAMBER
DE3619241C2 (en) * 1986-06-07 1994-07-21 Kloeckner Moeller Gmbh Extinguishing device for a circuit breaker
DE59007970D1 (en) * 1989-03-13 1995-01-26 Licentia Gmbh Automatic switches, especially miniature circuit breakers.

Also Published As

Publication number Publication date
EP1017072A3 (en) 2001-07-18
DE19860427A1 (en) 2000-06-29
ATE352852T1 (en) 2007-02-15
EP1017072A2 (en) 2000-07-05
DE19860427B4 (en) 2006-08-03
DE59914169D1 (en) 2007-03-15

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