EP0528342A1 - Arc chamber for an electrical switch device - Google Patents

Arc chamber for an electrical switch device Download PDF

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Publication number
EP0528342A1
EP0528342A1 EP92113714A EP92113714A EP0528342A1 EP 0528342 A1 EP0528342 A1 EP 0528342A1 EP 92113714 A EP92113714 A EP 92113714A EP 92113714 A EP92113714 A EP 92113714A EP 0528342 A1 EP0528342 A1 EP 0528342A1
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EP
European Patent Office
Prior art keywords
arc
current
contact point
quenching plate
guide rail
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.)
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Application number
EP92113714A
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German (de)
French (fr)
Inventor
Peter Huber
Richard Kommert
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ABB Patent GmbH
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ABB Patent GmbH
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Publication date
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Publication of EP0528342A1 publication Critical patent/EP0528342A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet

Definitions

  • the invention relates to an arc chamber for an electrical switching device according to the preamble of the claim.
  • Such arcing chambers are located in electrical switching devices with which short-circuit currents are to be switched off to limit current. They usually have a contact point which is formed from a fixed contact piece and a movable contact piece. At the fixed contact piece adjoins the arc guide rail, which is opposite a second arc guide rail assigned to the movable contact piece in the switched-off position, between which an arc-quenching plate packet with a plurality of arc-quenching plates is arranged. If the contact point is opened during a switching operation, an arc will occur between the two contact pieces drawn, the base points of which are moved or guided along the arc guide rails into the arc quenching plate package. Several partial arcs are formed in the arc quenching plate package. If the arc voltage generated in this way exceeds the mains voltage, the short-circuit current is limited and finally switched off, as a result of which the arc extinguishes.
  • the ends of the quenching plates must be insulated using suitable measures.
  • the object of the invention is to provide an arc arrangement of the type mentioned which reduces the tendency of the arc to reignite in the direction of the contact point and at the same time increases the dielectric strength of the quenching plate chamber after a short circuit in comparison with known arrangements.
  • a conventional arc chamber used and used in a known circuit breaker has a contact point 10 with a fixed contact piece 11 and a movable contact piece 12 which is arranged at the free end of a rotatably mounted contact lever 13.
  • the fixed contact piece 11 is seated on a horn 14 which merges into an upper arc guide rail 15.
  • At the arc guide rail 15 is followed by an arc quenching plate packet 16 or also a deion chamber 16, which is composed of several arc quenching plates 17 in a manner known per se.
  • a further arc guide rail 18 is provided, which has a first section 19 running parallel to the fixed contact piece 11, a section 20 running at an angle of approximately 45 ° and a section 21 running parallel to the arc extinguishing plates 17 .
  • a strand 40 connects to the contact lever 13 and is connected to a connecting terminal 41.
  • 40a denotes the strand in the state when the contact lever 13 has been opened in the position 13a.
  • a further connecting terminal 42 is provided, which is connected to the fixed contact piece via an electromagnetic release 43 and a thermal release 44.
  • the current flow I in the switched-on state coming from the contact lever 13 via the contact point 10 into the fixed contact piece 11 and the horn 14, from where the current via the line shown in broken lines according to arrow direction P to the electromagnetic trigger 43 and the thermal trigger 44 flows, forms a U-shape, which is aligned with the legs perpendicular to the arc quenching plates and which causes the arc to widen towards the arc quenching plate stack when the contact point is opened.
  • a current conductor 26 Arranged on the side of the arc-quenching plate packet 16 opposite the contact point 10 is a current conductor 26, which extends perpendicular to the plane of an arc-quenching plate 17 or the arc-guiding rail 15 or 16 and at a distance from it. That of the arc guide rail 15 The adjacent end 26a of the current conductor 26 is connected to the arc guide rail 18 at the point 27 in front of the arc quenching plate package 16. The other end 26b, which is adjacent to the arc guide rail 18, is connected to the connecting terminal 41 via a line 29.
  • the contact lever 13 pivots into the position 13a, as a result of which an arc 22 is drawn between the movable contact piece 12 and the fixed contact piece 11, which is widened in the direction of the arrow P 1.
  • the arcing base 23 which arises at the fixed contact piece 11 travels along the horn 14 towards the section 15, and the arcing base point 24 which arises at the movable contact piece jumps to this section after the movable contact piece 12 has come close to the section 19 and migrates the arc guide rail 18 along.
  • the arc 22 is divided into a number of partial arcs 25, which contribute to quenching the arc and generating electricity.
  • FIG. 2 shows a current-I-voltage-U time diagram for a switch in which the current conductor 26 is not present.
  • the section 19 of the arc guide rail is directly connected to the connecting terminal 41, so that when the arc base 24 commutates on the arc guide rail, the current is supplied to the arc 22 via the connecting terminal 41 of the arc guide rail 18.
  • the voltage is plotted on the upward ordinate and the current on the downward ordinate; and time t on the abscissa. Because of reignitions, which can occur because partial arcing to the front Run back to the contact point, there are voltage dips 30, in Figure 2 four voltage dips 30 are shown, the duration of which t 1 should be on average. These voltage dips 30 are offset by current increases 31 which contribute to the increase in the current integral.
  • the current flows after a switching operation, that is to say after commutation of the arc base point 24 on the arc guide rail 18, from the connecting terminal 41 in the direction of the arrow I A to the end 26b and in the direction of the arrow I A from the end 26b to End 26a and from there via the line piece 28 into the arc guide rail 18.
  • the current flows in the direction of arrow I A towards the partial arcs 25 and in the arc-quenching plate package also according to arrow direction I A to the arc guide rail 15, from where it flows according to arrow direction P to terminal 42 .
  • the current in the partial arcs 25 of the arc-quenching plate packet flows in the same direction as the current in the current conductor 26 and parallel thereto, whereby a suction effect on the arc is achieved which stabilizes the arc or the partial arcs 25 within the arc-quenching plate packet, so that Flashbacks, such as those produced by the dips 30 in FIG. 2, are at least drastically shortened, as shown by the dips 37 in FIG. 3.
  • the significantly reduced time period t 1 compared to the time period causes virtually no or only imperceptible current increases in the It diagram (see FIG. 3), which shows that the current integral at least through Voltage changes as the voltage dips 37 is not affected.

Abstract

In order to stabilise the arc (25a) inside an arc splitter stack (25) and in order to prevent restrikes, a current conductor (26) is provided on the side of the arc splitter stack (16) located opposite the contact point (10), which current conductor (26) is inserted into the current path of a switching apparatus such that the current in the current conductor (26) runs parallel to the current in the partial arcs (25) in the arc splitter stack (16). In consequence, significant voltage dips, and in consequence specific current surges with a corresponding increase in the heat integral (?I<2>dt) are prevented. The invention is used in particular in the case of line-protection circuit breakers which limit the short-circuit current. <IMAGE>

Description

Die Erfindung betrifft eine Lichtbogenkammer für ein elektrisches Schaltgerät nach dem Oberbegriff des Anspruches.The invention relates to an arc chamber for an electrical switching device according to the preamble of the claim.

Derartige Lichtbogenkammern befinden sich in elektrischen Schaltgeräten, mit denen Kurzschlußströme strombegrenzend abgeschaltet werden sollen. Sie besitzen normalerweise eine Kontaktstelle, die aus einem festen Kontaktstück und einem beweglichen Kontaktstück gebildet ist. An dem festen Kontaktstück schließt eie Lichtbogenleitschiene an, der eine in Ausschaltstellung dem beweglichen Kontaktstück zugeordnete zweite Lichtbogenleitschiene gegenüberliegt, zwischen denen ein Lichtbogenlöschblechpaket mit mehreren Lichtbogenlöschblechen angeordnet ist. Wenn bei einer Schalthandlung die Kontaktstelle geöffnet wird, wird zwischen den beiden Kontaktstücken ein Lichtbogen gezogen, dessen Fußpunkte entlang der Lichtbogenleitschienen in das Lichtbogenlöschblechpaket wandern bzw. geführt werden. In dem Lichtbogenlöschblechpaket bilden sich mehrere Teillichtbögen aus. Überschreitet die auf diese Art erzeugte Lichtbogenspannung die Netzspannung, wird der Kurzschlußstrom begrenzt und schließlich abgeschaltet, wodurch der Lichtbogen erlischt.Such arcing chambers are located in electrical switching devices with which short-circuit currents are to be switched off to limit current. They usually have a contact point which is formed from a fixed contact piece and a movable contact piece. At the fixed contact piece adjoins the arc guide rail, which is opposite a second arc guide rail assigned to the movable contact piece in the switched-off position, between which an arc-quenching plate packet with a plurality of arc-quenching plates is arranged. If the contact point is opened during a switching operation, an arc will occur between the two contact pieces drawn, the base points of which are moved or guided along the arc guide rails into the arc quenching plate package. Several partial arcs are formed in the arc quenching plate package. If the arc voltage generated in this way exceeds the mains voltage, the short-circuit current is limited and finally switched off, as a result of which the arc extinguishes.

Zur Verhinderung von Querzündungen zwischen den Teillichtbögen hinter dem Löschblechpaket (in Wandungsrichtung gesehen) müssen die Enden der Löschbleche durch geeignete Maßnahmen isoliert werden.To prevent cross-firings between the partial arcs behind the quenching plate package (viewed in the direction of the wall), the ends of the quenching plates must be insulated using suitable measures.

Es ist z. B. bekannt, sog. Abluftmasken aus Fiberpapier oder aus Kunststoff hinter der Löschblechkammer (auch Löschblechpaket genannt) anzubringen, oder durch geeignete Formgebung des Gehäuses die Querzündungen zu verhindern. Durch diese teilweise Isolierung wird zwangsläufig der Austrittsquerschnitt für die in der Löschblechkammer entstehenden Gase reduziert. Aufgrund der so entstehenden Druckerhöhung neigt der Lichtbogen zu Rückzündungen, d. h. er wandert aus der Löschblechkammer heraus zurück in Richtung Kontaktstelle. Dadurch entstehen Spannungseinbrüche, die zu partiellen Stromerhöhungen führen, wodurch sich das Joul'sche Integral (Q =∫ I²dt)

Figure imgb0001
, das ein Maß für das Schaltvermögen des Schalters ist, erhöht.It is Z. B. known to install so-called. Exhaust air masks made of fiber paper or plastic behind the quenching plate chamber (also called quenching plate package), or to prevent the cross-ignitions by suitable shaping of the housing. This partial insulation inevitably reduces the outlet cross section for the gases generated in the fire chamber. Because of the pressure increase that arises in this way, the arc tends to reignite, ie it migrates out of the quenching plate chamber back towards the contact point. This causes voltage dips that lead to partial increases in current, which results in the Joule integral (Q = ∫ I²dt)
Figure imgb0001
 , which is a measure of the switching capacity of the switch.

Aufgabe der Erfindung ist es, eine Lichtbogenanordnung der eingangs genannten Art zu schaffen, die die Rückzündungsneigung des Lichtbogens in Richtung Kontaktstelle reduziert sowie gleichzeitig die Spannungsfestigkeit der Löschblechkammer nach einem Kurzschluß im Vergleich zu bekannten Anordnungen erhöht.The object of the invention is to provide an arc arrangement of the type mentioned which reduces the tendency of the arc to reignite in the direction of the contact point and at the same time increases the dielectric strength of the quenching plate chamber after a short circuit in comparison with known arrangements.

Diese Aufgabe wird erfindungsgemäß gelöst durch die kennzeichnenden Merkmale des Anspruches.This object is achieved by the characterizing features of the claim.

Aufgrund der erfindungsgemäßen Anordnung des Stromleiters hinter dem Lichtbogenlöschblechpaket fließt ein Strom, der parallel zu dem Lichtbogenstrom verläuft, wodurch eine Saugwirkung entsteht, die den Lichtbogen in der Löschanordnung stabilisiert. Dadurch werden Einbrüche im Verlauf der Lichtbogenspannung so weit geändert, daß eine Erhöhung des Wärmeintegrals verhindert wird.Because of the arrangement according to the invention of the current conductor behind the arc quenching plate packet, a current flows that runs parallel to the arc current, which creates a suction effect that stabilizes the arc in the quenching arrangement. As a result, dips in the course of the arc voltage are changed to such an extent that an increase in the thermal integral is prevented.

Anhand der Zeichnung, in der ein Ausführungsbeispiel der Erfindung dargestellt ist, sollen die Erfindung sowie weitere Vorteile näher erläutert und beschrieben werden.The invention and further advantages are to be explained and described in more detail with reference to the drawing, in which an exemplary embodiment of the invention is shown.

Es zeigen:

Figur 1
eine Lichtbogenkammer gemäß der Erfindung,
Figur 2
einen Strom-Spannungsverlauf einer bekannten Lichtbogenkammer bei einer Abschalthandlung und
Figur 3
eine Strom-Spannungskurve ähnlich der der Figur 2 für die Lichtbogenkammer der Figur 1.
Show it:
Figure 1
an arc chamber according to the invention,
Figure 2
a current-voltage curve of a known arc chamber during a shutdown and
Figure 3
a current-voltage curve similar to that of Figure 2 for the arc chamber of Figure 1

Eine konventionelle, bei einem bekannten Leitungsschutzschalter benutzte und eingesetzte Lichtbogenkammer besitzt eine Kontaktstelle 10 mit einem Festkontaktstück 11 und einem beweglichen Kontaktstück 12, welches am freien Ende eines drehbar gelagerten Kontakthebels 13 angeordnet ist. Das Festkontaktstück 11 sitzt an einem Horn 14, welches in eine obere Lichtbogenleitschiene 15 übergeht. An die Lichtbogenleitschiene 15 schließt sich ein Lichtbogenlöschblechpaket 16 oder auch Deion-Kammer 16 an, die aus mehreren Lichtbogenlöschblechen 17 in ansich bekannter Weise zusammengesetzt ist. Parallel zu der Lichtbogenleitschiene 15 ist eine weitere Lichtbogenleitschiene 18 vorgesehen, die gegenüber dem Festkontaktstück 11 einen parallel zu diesem verlaufenden erten Abschnitt 19, einen unter einem Winkel von etwa 45° verlaufenden Abschnitt 20 und einen Abschnitt 21 aufweist, der parallel zu den Lichtbogenlöschblechen 17 verläuft. An dem Kontakthebel 13 schließt eine Litze 40 an, die mit einer Anschlußklemme 41 verbunden ist. 40a bezeichnet die Litze in dem Zustand, wenn der Kontakthebel 13 in die Stellung 13a geöffnet wurde. Auf der gegenüberliegenden, in der Zeichnung rechts befindlichen Seite ist eine weitere Anschlußklemme 42 vorgesehen, die mit dem Festkontaktstück über einen elektromagnetischen Auslöser 43 und einen thermischen Auslöser 44 verbunden ist. Man erkennt, daß der Stromfluß I im eingeschalteten Zustand, herkommend von dem Kontakthebel 13 über die Kontaktstelle 10 in das Festkontaktstück 11 und das Horn 14 verläuft, von wo aus der Strom über die strichliert dargestellte Leitung gemäß Pfeilrichtung P zu dem elektromagnetischen Auslöser 43 und dem thermischen Auslöser 44 fließt, eine U-Form bildet, die mit den Schenkeln senkrecht zu den Lichtbogenlöschblechen ausgerichtet und die bei der Öffnung der Kontaktstelle eine Aufweitung des Lichtbogens in Richtung zum Lichtbogenlöschblechpaket bewirkt.A conventional arc chamber used and used in a known circuit breaker has a contact point 10 with a fixed contact piece 11 and a movable contact piece 12 which is arranged at the free end of a rotatably mounted contact lever 13. The fixed contact piece 11 is seated on a horn 14 which merges into an upper arc guide rail 15. At the arc guide rail 15 is followed by an arc quenching plate packet 16 or also a deion chamber 16, which is composed of several arc quenching plates 17 in a manner known per se. Parallel to the arc guide rail 15, a further arc guide rail 18 is provided, which has a first section 19 running parallel to the fixed contact piece 11, a section 20 running at an angle of approximately 45 ° and a section 21 running parallel to the arc extinguishing plates 17 . A strand 40 connects to the contact lever 13 and is connected to a connecting terminal 41. 40a denotes the strand in the state when the contact lever 13 has been opened in the position 13a. On the opposite side, on the right in the drawing, a further connecting terminal 42 is provided, which is connected to the fixed contact piece via an electromagnetic release 43 and a thermal release 44. It can be seen that the current flow I in the switched-on state, coming from the contact lever 13 via the contact point 10 into the fixed contact piece 11 and the horn 14, from where the current via the line shown in broken lines according to arrow direction P to the electromagnetic trigger 43 and the thermal trigger 44 flows, forms a U-shape, which is aligned with the legs perpendicular to the arc quenching plates and which causes the arc to widen towards the arc quenching plate stack when the contact point is opened.

Auf der der Kontaktstelle 10 entgegengesetzten Seite des Lichtbogenlöschblechpaketes 16 ist ein Stromleiter 26 angeordnet, der senkrecht zu der Ebene eines Löschbleches 17 oder der Lichtbogenleitschiene 15 bzw. 16 verläuft und zwar in Abstand dazu. Das der Lichtbogenleitschiene 15 benachbart liegende Ende 26a des Stromleiters 26 ist an der Stelle 27 vor dem Lichtbogenlöschblechpaket 16 mit der Lichtbogenleitschiene 18 verbunden. Das andere Ende 26b, welche der Lichtbogenleitschiene 18 benachbart ist, ist über eine Leitung 29 mit der Anschlußklemme 41 verbunden.Arranged on the side of the arc-quenching plate packet 16 opposite the contact point 10 is a current conductor 26, which extends perpendicular to the plane of an arc-quenching plate 17 or the arc-guiding rail 15 or 16 and at a distance from it. That of the arc guide rail 15 The adjacent end 26a of the current conductor 26 is connected to the arc guide rail 18 at the point 27 in front of the arc quenching plate package 16. The other end 26b, which is adjacent to the arc guide rail 18, is connected to the connecting terminal 41 via a line 29.

Wenn die Kontaktstelle 10 geöffnet wird, dann schwenkt der Kontakthebel 13 in die Stellung 13a, wodurch zwischen dem beweglichen Kontaktstück 12 und dem festen Kontaktstück 11 ein Lichtbogen 22 gezogen wird, der in Pfeilrichtung P₁ aufgeweitet wird. Der am Festkontaktstück 11 entstehende Lichtbogenfußpunkt 23 wandert das Horn 14 entlang hin zu dem Abschnitt 15, und der am beweglichen Kontaktstück entstehende Lichtbogenfußpunkt 24 springt, nachdem das bewegliche Kontaktstück 12 in die Nähe des Abschnittes 19 gelangt ist, auf diesen Abschnitt und wandert die Lichtbogenleitschiene 18 entlang. Im Lichtbogenlöschblechpaket teilt sich der Lichtbogen 22 in mehrere Teillichtbögen 25 auf, die zur Löschung des Lichtbogens und zur Stromerzeugung beitragen.When the contact point 10 is opened, the contact lever 13 pivots into the position 13a, as a result of which an arc 22 is drawn between the movable contact piece 12 and the fixed contact piece 11, which is widened in the direction of the arrow P 1. The arcing base 23 which arises at the fixed contact piece 11 travels along the horn 14 towards the section 15, and the arcing base point 24 which arises at the movable contact piece jumps to this section after the movable contact piece 12 has come close to the section 19 and migrates the arc guide rail 18 along. In the arc quenching plate package, the arc 22 is divided into a number of partial arcs 25, which contribute to quenching the arc and generating electricity.

Die Figur 2 zeigt ein Strom-I-Spannungs-U-Zeitdiagramm für einen Schalter, bei dem der Stromleiter 26 nicht vorhanden ist. In diesem Falle ist der Abschnitt 19 der Lichtbogenleitschiene mit der Anschlußklemme 41 direkt verbunden, so daß dann, wenn der Lichtbogenfußpunkt 24 auf die Lichtbogenleitschiene kommutiert, der Strom über die Anschlußklemme 41 der Lichtbogenleitschiene 18 dem Lichtbogen 22 zugeführt wird. Auf der nach oben verlaufenden Ordinate ist die Spannung und auf der nach unten verlaufenden Ordinate der Strom aufgetragen; und auf der Abszisse die Zeit t. Aufgrund von Rückzündungen, die deshalb entstehen können, weil Teillichtbögen nach vorne hin zur Kontaktstelle zurücklaufen, entstehen Spannungseinbrüche 30, in Figur 2 sind vier Spannungseinbrüche 30 dargestellt, deren Dauer t₁ im Durchscnitt betragen soll. Diesen Spannungseinbrüchen 30 stehen Stromerhöhungen 31 gegenüber, die die Erhöhung de Strom-Integrals beitragen.FIG. 2 shows a current-I-voltage-U time diagram for a switch in which the current conductor 26 is not present. In this case, the section 19 of the arc guide rail is directly connected to the connecting terminal 41, so that when the arc base 24 commutates on the arc guide rail, the current is supplied to the arc 22 via the connecting terminal 41 of the arc guide rail 18. The voltage is plotted on the upward ordinate and the current on the downward ordinate; and time t on the abscissa. Because of reignitions, which can occur because partial arcing to the front Run back to the contact point, there are voltage dips 30, in Figure 2 four voltage dips 30 are shown, the duration of which t 1 should be on average. These voltage dips 30 are offset by current increases 31 which contribute to the increase in the current integral.

Durch die erfindungsgemäße Zuordnung des Stromleiters 26 zu dem Lichtbogenlöschblechpaket fließt der Strom nach einer Schalthandlung, also nach Kommutierung des Lichtbogenfußpunktes 24 auf die Lichtbogenleitschiene 18 von der Anschlußklemme 41 gemäß Pfeilrichtung IA hin zu dem Ende 26b und gemäß Pfeilrichtung IA von dem Ende 26b zum Ende 26a und von dort über das Leitungsstück 28 in die Lichtbogenleitschiene 18 hinein. Wenn der Lichtbogen in das Lichtbogenlöschblechpaket eingelaufen ist und dort die Teillichtbögen 25 bildet, dann fließt der Strom gemäß Pfeilrichtung IA hin zu den Teillichtbögen 25 und im Lichtbogenlöschblechpaket ebenfalls gemäß Pfeilrichtung IA zur Lichtbogenleitschiene 15, von wo er gemäß Pfeilrichtung P zur Anschlußklemme 42 fließt. Man erkennt, daß der Strom in den Teillichtbögen 25 des Lichtbogenlöschblechpaketes in gleiche Richtung wie der Strom im Stromleiter 26 und parallel dazu fließt, wodurch eine Saugwirkung auf den Lichtbogen erzielt wird, die den Lichtbogen bzw. die Teillichtbögen 25 innerhalb des Lichtbogenlöschblechpaketes stabilisiert, so daß Rückzündungen, wie sie beispielsweise in der Figur 2 durch die Einbrüche 30 erzeugt werden, zumindest drastisch verkürzt werden, wie in der Figur 3 durch die Einbrüche 37 dargestellt ist. Die gegenüber der Zeitdauer t₁ erheblich verringerte Zeitdauer t₂ bewirkt praktisch keine oder nur unmerkbare Stromerhöhungen im I-t-Diagramm (siehe Figur 3), wodurch ersichtlich ist, daß das Stromintegral zumindest durch Spannungsveränderungen wie die Spannungseinbrüche 37 nicht beeinflußt wird.Due to the inventive assignment of the current conductor 26 to the arc extinguisher stack, the current flows after a switching operation, that is to say after commutation of the arc base point 24 on the arc guide rail 18, from the connecting terminal 41 in the direction of the arrow I A to the end 26b and in the direction of the arrow I A from the end 26b to End 26a and from there via the line piece 28 into the arc guide rail 18. When the arc has entered the arc-quenching plate package and forms the partial arcs 25 there, the current flows in the direction of arrow I A towards the partial arcs 25 and in the arc-quenching plate package also according to arrow direction I A to the arc guide rail 15, from where it flows according to arrow direction P to terminal 42 . It can be seen that the current in the partial arcs 25 of the arc-quenching plate packet flows in the same direction as the current in the current conductor 26 and parallel thereto, whereby a suction effect on the arc is achieved which stabilizes the arc or the partial arcs 25 within the arc-quenching plate packet, so that Flashbacks, such as those produced by the dips 30 in FIG. 2, are at least drastically shortened, as shown by the dips 37 in FIG. 3. The significantly reduced time period t 1 compared to the time period causes virtually no or only imperceptible current increases in the It diagram (see FIG. 3), which shows that the current integral at least through Voltage changes as the voltage dips 37 is not affected.

Claims (1)

Lichtbogenkammer für ein elektrisches Schaltgerät, mit wenigstens einer ein festes und ein bewegliches Kontaktstück aufweisenden Kontaktstelle, an die ein zwischen zwei Lichtbogenleitschienen befindliches Lichtbogenlöschblechpaket anschließt, dergestalt, daß die Fußpunkte eines beim Öffnen der Kontaktstelle entstehenden Schaltlichtbogens auf den Lichtbogenleitschienen entlanglaufen, wobei der Lichtbogen in das Löschblechpaket wandert und darin gelöscht wird, dadurch gekennzeichnet, daß auf der der Kontaktstelle (10) abgewandten Seite des Lichtbogenlöschblechpaketes (16) ein senkrecht zu der Ebene eines der Löschbleche (17) verlaufender Stromleiter (25, 26) vorgesehen ist, der so in den Strompfad des Schaltgerätes eingeschaltet ist, daß der Strom im Stromleiter (26) bei einer Schalthandlung in gleiche Richtung wie der Strom in dem im Lichtbogenlöschblechpaket (16) brennenden Lichtbogen (25) fließt.Arc chamber for an electrical switching device, with at least one contact point having a fixed and a movable contact piece, to which an arc quenching plate packet located between two arc guide rails is connected, in such a way that the base points of a switching arc that arises when the contact point is opened run along the arc guide rails, the arc entering the Extinguishing sheet packet moves and is extinguished therein, characterized in that on the side of the arc extinguishing sheet packet (16) facing away from the contact point (10) there is provided a current conductor (25, 26) running perpendicular to the plane of one of the extinguishing sheets (17) and thus in the Current path of the switching device is switched on so that the current in the current conductor (26) flows in the same direction during a switching operation as the current in the arc (25) burning in the arc quenching plate packet (16).
EP92113714A 1991-08-17 1992-08-12 Arc chamber for an electrical switch device Withdrawn EP0528342A1 (en)

Applications Claiming Priority (2)

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DE4127291 1991-08-17
DE19914127291 DE4127291C2 (en) 1991-08-17 1991-08-17 Arc chamber for an electrical switching device

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Cited By (1)

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AT411408B (en) * 1999-09-02 2003-12-29 Felten & Guilleaume Ag Oester MULTIPOLE SWITCH

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FR2731838B1 (en) * 1995-03-16 1997-06-06 Schneider Electric Sa ELECTRICAL DIFFERENTIAL PROTECTION DEVICE WITH TEST CIRCUIT
DE10251656C5 (en) * 2002-11-01 2009-04-02 Siemens Ag Method for determining the load of a contact arrangement

Citations (3)

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JPH0628767Y2 (en) * 1986-09-11 1994-08-03 三菱電機株式会社 Circuit breaker

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DE2141525A1 (en) * 1970-10-28 1972-05-04 Weber Ag Fab Elektro Conductor arrangement in a circuit breaker
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DE4127291A1 (en) 1993-02-18
DE4127291C2 (en) 1996-07-11

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