EP0350823A2 - Low-voltage switch gear - Google Patents

Low-voltage switch gear Download PDF

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Publication number
EP0350823A2
EP0350823A2 EP89112547A EP89112547A EP0350823A2 EP 0350823 A2 EP0350823 A2 EP 0350823A2 EP 89112547 A EP89112547 A EP 89112547A EP 89112547 A EP89112547 A EP 89112547A EP 0350823 A2 EP0350823 A2 EP 0350823A2
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EP
European Patent Office
Prior art keywords
low
switching device
voltage switching
prechamber
openings
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
EP89112547A
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German (de)
French (fr)
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EP0350823A3 (en
Inventor
Erhard Runtsch
Rolf Goehle
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ABB AG Germany
ABB AB
Original Assignee
Asea Brown Boveri AG Germany
Asea Brown Boveri AB
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Publication of EP0350823A2 publication Critical patent/EP0350823A2/en
Publication of EP0350823A3 publication Critical patent/EP0350823A3/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
    • H01H9/446—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using magnetisable elements associated with the contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/302—Means for extinguishing or preventing arc between current-carrying parts wherein arc-extinguishing gas is evolved from stationary parts
    • 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

Definitions

  • the invention relates to a low-voltage switching device, in particular a circuit breaker, with a contact point which is arranged in an arc chamber with prechamber plates which laterally delimit the arc chamber on both sides.
  • Low-voltage switchgear often have arcing chambers in which the contact point is arranged, in which an arc is ignited when the movable contact piece is lifted off the fixed contact piece, which at its base point leads to damage of the contact pieces by melting of the contact material. At the same time, if the arc is present, the current continues to flow until the arc extinguishes.
  • the arc chambers were delimited with so-called prechamber plates, at least on the chamber sides, in order to achieve a channel effect for the arc and thus its rapid entry into the adjacent quenching chamber.
  • DE-OS 27 04 160 From DE-OS 27 04 160 an electrical switching device has become known, in which the arc chamber is delimited on both sides by arc-proof limiting plates, in particular made of ceramic. This constructive measure proves to be advantageous in order to prevent the arc or the arc gases from migrating laterally out of the arc space and thereby causing damage to the housing.
  • DE-OS 27 04 160 provides that at least one of the surfaces of the boundary plates facing the arc chamber is provided with a material which promotes arc extinguishing. The gas has the task of cooling the arc, which burns at high temperature, and thus extinguishing it.
  • the solution to the object is characterized in that the prechamber plates each have a core made of ferromagnetic material, that the prechamber plates are provided with openings that penetrate through their plate thickness, which form a hole pattern and their size according to the relationship is provided and that the perforated cores of the prechamber plates are extrusion-coated with a gas-emitting insulating material and thus form the prechamber plate.
  • circumferential surface is understood to mean the surface which is delimited in a cylindrical manner by the edges of the opening and is determined by the circumference of the opening and by the wall thickness of the plate.
  • the particular advantage of the design of the prechamber plates according to the invention is that, on the one hand, the ferromagnetic effect of the plate material, which leads to a constriction of the switching arc, is used and, on the other hand, the surface of the prechamber plates, which is covered with gas-emitting insulating material, can be considerably enlarged by introducing a perforated grid is, so that with an externally constant overall volume of the low-voltage switching device or the arc chamber contained therein, a considerably stronger arc than in comparable known arc chambers can be controlled, since a significantly increased cooling capacity due to a larger amount of cooling gas emerging from the insulating material due to the increased surface area of the invention Antechamber plate results.
  • the relationship given with regard to the size of the holes is initially independent of the hole geometry, since it is only important that the area delimiting the respective hole, ie circumference ⁇ plate thickness, is larger than the cross section of the opening made in the prechamber plate.
  • the geometric shape of the opening is initially not defined in more detail, so that in principle any desired opening contour is possible. However, for electrical reasons, in particular in order to reliably rule out the formation of a base for arcing, it is preferable to design the opening in a circular shape.
  • the prechamber plates consist of pure iron.
  • nickel i.e. H. Pure nickel or a nickel alloy can be provided.
  • thermosets for. B. polyoxides or polyamides.
  • each opening is at a minimum distance from the neighboring openings according to their diameter.
  • the openings which are adjacent to the edge of the prechamber plate, have an edge distance of at least one opening diameter as well.
  • Another advantage of the perforated chamber plate according to the invention over the perforated chamber plates described in the prior art is that due to the all-round coating of the starting plate with insulating material, there is no fixed assignment to the installation location, i. that is, the prechamber plate can optionally be arranged on both sides of the arc chamber without disadvantage for the arc quenching behavior.
  • a prechamber plate 10 is shown in perspective, which has a rectangular contour adapted to the arcing chamber, i. H. with two mutually parallel long sides 12, 14 and two mutually parallel transverse sides 16, 18.
  • a bevel 15 is formed between the upper long side 14 and the front transverse side 16 in accordance with the contour of the light chamber.
  • the prechamber plate 10 has openings 20, which are arranged in a hole pattern 22 running to the mentioned outer sides 12, 14, 16, 18.
  • the openings 20 are arranged on the flat surface of the prechamber plate 10, which has a plate thickness s, delimited by the sides 12, 14, 15, 16, 18 and penetrate it completely.
  • the openings 20 are provided as circular bores, the size of which is dimensioned such that, taking into account the plate thickness, there is a larger area than with the flat surface.
  • Another influencing factor which is not expressed in this formulaic relationship, was derived from the wettability of the insulating material to be sprayed on. Taking this aspect into account, it is expedient to provide the openings 20 to be introduced with a sufficiently large diameter so that after the coating with the insulating material the openings still exist and are not clogged by the insulating material.
  • FIG. 2 shows the installation position of the prechamber plates 10 known from FIG. 1 in a circuit breaker 24, the outer housing contour of which is indicated by a dashed line.
  • the prechamber plates 10 are arranged on both sides of a contact point 26, which is formed by a fixed contact piece 25 and a movable contact piece 27.
  • the fixed contact piece 25 continues in an arc guide rail 28, which is guided to an arc extinguishing device 32 formed from quenching plates 30, which is arranged below a magnetic release 34.

Abstract

Known low-voltage switchgear have an arcing chamber which is delimited on either side by arc-resistant pre-chamber plates, especially made of ceramic. In a novel low-voltage switchgear, pre-chamber plates (10) made of perforated ferromagnetic metal plates which are sprayed all around with a gas-emitting insulation material are provided as core. The novel pre-chamber plates are employed especially in circuit-breakers.

Description

Die Erfindung betrifft ein Niederspannungsschaltgerät, insbesondere einen Leitungsschutzschalter, mit einer Kontaktstelle, die in einer Lichtbogenkammer mit Vorkam­merplatten welche beiderseits die Lichtbogenkammer seitlich begrenzen, angeordnet ist.The invention relates to a low-voltage switching device, in particular a circuit breaker, with a contact point which is arranged in an arc chamber with prechamber plates which laterally delimit the arc chamber on both sides.

Niederspannungsschaltgeräte besitzen vielfach Lichtbo­genkammern, in welchen die Kontaktstelle angeordnet ist, in welcher beim Abheben des beweglichen Kontaktstücks vom festen Kontaktstück ein Lichtbogen gezündet wird, der in seinem Fußpunkt jeweils zu einer Beschädigung der Kontaktstücke durch Aufschmelzen des Kontaktmaterials führt. Gleichzeitig fließt bei anstehendem Lichtbogen der Strom weiter bis der Lichtbogen erlöscht. Um dies besser zu erreichen, wurden die Lichtbogenkammern mit sog. Vorkammerplatten, zumindest an den Kammerseiten, begrenzt, um auf diese Weise einen Kanaleffekt für den Lichtbogen und damit sein rasches Einlaufen in die an­grenzende Löschkammer zu erreichen.Low-voltage switchgear often have arcing chambers in which the contact point is arranged, in which an arc is ignited when the movable contact piece is lifted off the fixed contact piece, which at its base point leads to damage of the contact pieces by melting of the contact material. At the same time, if the arc is present, the current continues to flow until the arc extinguishes. To achieve this better, the arc chambers were delimited with so-called prechamber plates, at least on the chamber sides, in order to achieve a channel effect for the arc and thus its rapid entry into the adjacent quenching chamber.

Aus der DE-OS 27 04 160 ist ein elektrisches Schaltgerät bekannt geworden, in welchem die Lichtbogenkammer beid­seitig von lichtbogenfesten Begrenzungsplatten, insbe­sondere aus Keramik, begrenzt ist. Diese konstruktive Maßnahme erweist sich als vorteilhaft, um so zu verhin­dern, daß der Lichtbogen bzw. die Lichtbogengase seit­lich aus dem Lichtbogenraum herauswandern und dadurch eine Beschädigung des Gehäuses hervorrufen. Um letzteres zu verhindern und gleichzeitig den Lichtobogeneinlauf in die Löschkammer zu beschleunigen, ist gemäß der DE-OS 27 04 160 vorgesehen, daß wenigstens eine der dem Lichtbogenraum zugewandten Flächen einer der Begren­zungsplatten mit einem die Lichtbogenlöschung begünsti­genden Gas abgebenden Material versehen ist. Das Gas hat hierbei die Aufgabe, den mit hoher Temperatur brennenden Lichtbogen zu kühlen und so sein Erlöschen herebeizufüh­ren.From DE-OS 27 04 160 an electrical switching device has become known, in which the arc chamber is delimited on both sides by arc-proof limiting plates, in particular made of ceramic. This constructive measure proves to be advantageous in order to prevent the arc or the arc gases from migrating laterally out of the arc space and thereby causing damage to the housing. In order to prevent the latter and, at the same time, to accelerate the arc entry into the quenching chamber, DE-OS 27 04 160 provides that at least one of the surfaces of the boundary plates facing the arc chamber is provided with a material which promotes arc extinguishing. The gas has the task of cooling the arc, which burns at high temperature, and thus extinguishing it.

Bei höheren Stromstärken allerdings erweist sich die Wirkung des aus einer Vorkammerplatte austretenden Löschgases als nicht ausreichend, so daß zusätzliche Maßnahmen erforderlich sind, um den Lichtbogen in der gewünschten Weise möglichst schnell von der Kontakstel­le weg die Löscheinrichtung zu führen.At higher currents, however, the effect of the quenching gas emerging from a prechamber plate proves to be insufficient, so that additional measures are required in order to lead the arc away from the contact point in the desired manner as quickly as possible.

Ausgehend vom vorstehend genannten Stand der Technik ist es daher Aufgabe der Erfindung für ein Niederspannungs­schaltgerät der eingangs genannten Art die Vorkammer­platten dahingehend au verbessern, daß ein rasches Ver­lagern des Schaltlichtbogens von der Kontaktstelle in die Löschkammer erreichbar ist.Starting from the above-mentioned prior art, it is therefore an object of the invention for a low-voltage switching device of the type mentioned to improve the prechamber plates in such a way that the switching arc can be rapidly displaced from the contact point into the quenching chamber.

Die Lösung der Aufgabe ist erfindungsgemäß dadurch ge­kennzeichnet, daß die Vorkammerplatten jeweils einen Kern aus ferromagnetischem Material aufweisen, daß die Vorkammerplatten mit ihre Plattenstärke durchgreifenden Öffnungen versehen sind, welche ein Lochraster bilden und deren Größe entsprechend der Beziehung

Figure imgb0001
vorgesehen ist und daß die mit Löchern versehenen Kerne der Vorkammerplatten mit einem gasabgebenden Isolierma­terial umspritzt sind und so die Vorkammerplatte bilden.The solution to the object is characterized in that the prechamber plates each have a core made of ferromagnetic material, that the prechamber plates are provided with openings that penetrate through their plate thickness, which form a hole pattern and their size according to the relationship
Figure imgb0001
 is provided and that the perforated cores of the prechamber plates are extrusion-coated with a gas-emitting insulating material and thus form the prechamber plate.

Unter Umfangsfläche wird in diesem Zusammenhang die Flä­che verstanden, die zylinderförmig von den Rändern der Öffnung begrenzt ist und vom Umfang der Öffnung und von der Wanddicke der Platte bestimmt ist.In this context, circumferential surface is understood to mean the surface which is delimited in a cylindrical manner by the edges of the opening and is determined by the circumference of the opening and by the wall thickness of the plate.

Der besondere Vorteil der erfindungsgemäßen Ausgestal­tung der Vorkammerplatten besteht darin, daß einerseits die ferromagnetische Wirkung des Plattenmaterials, die zu einer Einschnürung des Schaltlichtbogens führt, her­angezogen wird und andererseits durch Einbringung eines Lochrasters in die Vorkammerplatten deren Oberfläche, welche mit gasabgebenden Isoliermaterial bedeckt ist, erheblich vergrößerbar ist, so daß bei äußerlich gleich­bleibendem Bauvolumen des Niederspannungsschaltgerätes bzw. der darin enthaltenden Lichtbogenkammer ein be­trächtlich stärkerer Lichtbogen als in vergleichbaren bekannten Lichtbogenkammern beherrschbar ist, da eine deutlich erhöhte Kühlleistung infolge einer größeren Menge an aus dem Isoliermaterial austretenden Kühlgas wegen der vergrößerten Oberfläche der erfindungsgemäßen Vorkammerplatte resultiert. Die angegebene Beziehung bezüglich der Größe der Löcher ist zunächst unabhängig von der Lochgeometrie, da es nur darauf ankommt, daß die das jeweilige Loch begrenzende Fläche, d. h. Umfang · Plattendicke, größer ist als der Querschnitt der in die Vorkammerplatte eingebrachten Öffnung.The particular advantage of the design of the prechamber plates according to the invention is that, on the one hand, the ferromagnetic effect of the plate material, which leads to a constriction of the switching arc, is used and, on the other hand, the surface of the prechamber plates, which is covered with gas-emitting insulating material, can be considerably enlarged by introducing a perforated grid is, so that with an externally constant overall volume of the low-voltage switching device or the arc chamber contained therein, a considerably stronger arc than in comparable known arc chambers can be controlled, since a significantly increased cooling capacity due to a larger amount of cooling gas emerging from the insulating material due to the increased surface area of the invention Antechamber plate results. The relationship given with regard to the size of the holes is initially independent of the hole geometry, since it is only important that the area delimiting the respective hole, ie circumference × plate thickness, is larger than the cross section of the opening made in the prechamber plate.

Die geometrische Form der Öffnung ist zunächst nicht näher definiert, so daß grundsätzlich jede gewünschte Öffnungskontur möglich ist. Allerdings ist aus elektri­schen Gründen, insbesondere um Fußpunktbildung für Lichtbögen sicher auszuschließen, die Gestaltung der Öffnung in Kreisform vorzuziehen.The geometric shape of the opening is initially not defined in more detail, so that in principle any desired opening contour is possible. However, for electrical reasons, in particular in order to reliably rule out the formation of a base for arcing, it is preferable to design the opening in a circular shape.

In zweckmäßiger Weiterbildung der Erfindung ist vorgese­hen, daß die Vorkammerplatten aus Reineisen bestehen. In besonderen Fällen, kann stattdessen aber auch Nickel, d. h. Reinnickel oder eine Nickellegierung, vorgesehen sein.In an expedient development of the invention it is provided that the prechamber plates consist of pure iron. In special cases, however, nickel, i.e. H. Pure nickel or a nickel alloy can be provided.

Für das Isoliermaterial, mit welchem die aus Metall ge­fertigten Plattenrohlinge umspritzt werden, ist solches Material vorgesehen, welches unter Einwirkung der vom Lichtobogen ausgehenden hohen Temperatur größtmögliche Gasentwicklung zeigt, um hierdurch eine rasche Löschung des Lichtbogens zu erreichen. Insbesondere kommen hier­für Duroplaste, z. B. Polyoxide oder Polyamide in Be­tracht.For the insulating material with which the plate blanks made of metal are extrusion-coated, material is provided which, under the action of the high temperature emanating from the arc, shows the greatest possible gas evolution in order to thereby quickly extinguish the arc. In particular, come for this thermosets, for. B. polyoxides or polyamides.

Für die Gestaltung des bereits erwähnten Lochrasters ist vorgesehen, daß jede Öffnung zu den benachbarten Öffnun­gen einen Mindestabstand entsprechend ihrem Durchmesser aufweist.For the design of the hole pattern already mentioned, it is provided that each opening is at a minimum distance from the neighboring openings according to their diameter.

Ferner ist vorgesehen, daß die Öffnungen, die dem Rand der Vorkammerplatte benachbart sind, einen Randabstand von wenigstens ebenfalls einem Öffnungsdurchmesser auf­weisen.It is further provided that the openings, which are adjacent to the edge of the prechamber plate, have an edge distance of at least one opening diameter as well.

Darüberhinaus kann es vorteilhaft sein, die Öffnungen versetzt zueinander anzuordnen, d. h., daß ihre Mittel­punkte gegenüber denen der unmittelbar benachbarten Öff­nungen versetzt sind.In addition, it can be advantageous to arrange the openings offset from one another, i. that is, their centers are offset from those of the immediately adjacent openings.

Ein weiterer Vorzug der erfindungsgemäßen Lochkammer­platte gegenüber den im Stand der Technik beschriebenen Lochkammerplatten besteht darin, daß aufgrund der all­seitigen Beschichtung der Ausgangsplatte mit Isolierma­terial keine feste Zuordnung zum Einbauort resultiert, d. h., die Vorkammerplatte kann ohne Nachteil für das Lichtbogenlöschverhalten wahlweise auf beiden Seiten der Lichtbogenkammer angeordnet sein.Another advantage of the perforated chamber plate according to the invention over the perforated chamber plates described in the prior art is that due to the all-round coating of the starting plate with insulating material, there is no fixed assignment to the installation location, i. that is, the prechamber plate can optionally be arranged on both sides of the arc chamber without disadvantage for the arc quenching behavior.

Diese und weitere vorteilhafte Ausgestaltungen der Er­findung sind in den Unteransprüchen angegeben.These and further advantageous refinements of the invention are specified in the subclaims.

Anhand eines in der Zeichnung dargestellten Ausführungs­beispieles sollen die Erfindung, vorteilhafte Ausgestal­tungen und besondere Vorteile der Erfindung näher erläu­tert und beschrieben werden.The invention, advantageous refinements and particular advantages of the invention are to be explained and described in more detail with reference to an exemplary embodiment shown in the drawing.

Es zeigen:

  • Figur 1 eine erfindungsgemäße Vorkammerplatte in per­spektivischer Darstellung.
  • Figur 2 die Kontur eines Leitungsschutzschalters mit einer Kontaktstelle und Vorkammerplatten
Show it:
  • 1 shows a prechamber plate according to the invention in a perspective view.
  • Figure 2 shows the contour of a circuit breaker with a contact point and prechamber plates

In der Figur 1 ist eine Vorkammerplatte 10 in perspekti­vischer Darstellung gezeigt, welche eine der Lichtbogen­kammer angepaßte rechteckförmige Kontur, d. h. mit zwei zueinander parallelen Längsseiten 12, 14 sowie zwei hierzu senkrecht angeordneten zueinander parallelen Querseiten 16, 18. Zwischen der oberen Längsseite 14 und der vorderen Querseite 16 ist eine Anschrägung 15 einge­formt entsprechend der Lichtkammerkontur.In FIG. 1, a prechamber plate 10 is shown in perspective, which has a rectangular contour adapted to the arcing chamber, i. H. with two mutually parallel long sides 12, 14 and two mutually parallel transverse sides 16, 18. A bevel 15 is formed between the upper long side 14 and the front transverse side 16 in accordance with the contour of the light chamber.

Ferner besitzt die Vorkammerplatte 10 Öffnungen 20, wel­che in einem zu den genannten Außenseiten 12, 14, 16, 18 verlaufenden Lochraster 22 angeordnet sind.Furthermore, the prechamber plate 10 has openings 20, which are arranged in a hole pattern 22 running to the mentioned outer sides 12, 14, 16, 18.

Die Öffnungen 20 sind auf der von den Seiten 12, 14, 15, 16, 18 begrenzten ebenen Fläche der Vorkammerplatte 10, welche eine Plattendicke s aufweist, angeordnet und durchgreifen diese vollständig.The openings 20 are arranged on the flat surface of the prechamber plate 10, which has a plate thickness s, delimited by the sides 12, 14, 15, 16, 18 and penetrate it completely.

Die Öffnungen 20 sind als kreisrunde Bohrungen vorgese­hen, deren Größe so dimensioniert ist, daß sich unter Einbeziehung der Plattendicke eine größere Fläche ergibt als bei der ebenen Fläche. Zur Bestimmung der erforder­lichen Größe der Öffnungen 20 gilt folgende Formel

Figure imgb0002
mit d = Lochdurchmesser und s = Plattendicke. Bei Auflö­sung dieser Ungleichung nach dem Durchdmesser ergibt sich, daß dieser kleiner sein muß als die vierfache Plattendicke.The openings 20 are provided as circular bores, the size of which is dimensioned such that, taking into account the plate thickness, there is a larger area than with the flat surface. The following formula applies to determining the required size of the openings 20
Figure imgb0002
 with d = hole diameter and s = plate thickness. If this inequality is resolved according to the diameter, this means that it must be smaller than four times the plate thickness.

Ein weiterer Einflußfaktor, der in dieser formelhaften Beziehung nicht ausgedrückt ist, leitete sich ab von der Benetzungsfähigkeit des aufzuspritzenden Isoliermate­rials. Unter Einbeziehung dieses Aspektes ist es zweck­mäßig, die einzubringenden Öffnungen 20 mit ausreichend großem Durchmesser vorzusehen, so daß nach der Beschich­tung mit dem Isoliermaterial die Öffnungen nach wie vor bestehen und nicht vom Isoliermaterial zugesetzt sind.Another influencing factor, which is not expressed in this formulaic relationship, was derived from the wettability of the insulating material to be sprayed on. Taking this aspect into account, it is expedient to provide the openings 20 to be introduced with a sufficiently large diameter so that after the coating with the insulating material the openings still exist and are not clogged by the insulating material.

In Figur 2 ist die Einbaulage der aus Figur 1 bekannten Vorkammerplatten 10 in einem Leitungsschutzschalter 24 gezeigt, dessen äußere Gehäusekontur mittels gestrichel­ter Linie angedeutet ist.FIG. 2 shows the installation position of the prechamber plates 10 known from FIG. 1 in a circuit breaker 24, the outer housing contour of which is indicated by a dashed line.

Wie auch im Stand der Technik sind die Vorkammerplatten 10 beiderseits einer Kontaktstelle 26 angeordnet, die von einem festen Kontaktstück 25 und einem beweglichen Kontaktstück 27 gebildet ist. Das feste Kontaktstück 25 setzt sich fort in einer Lichtbogenleitschiene 28, die zu einer aus Löschblechen 30 gebildeten Lichtbogenlö­scheinrichtung 32 geführt ist, welche unterhalb eines Magnetauslösers 34 angeordnet ist.As in the prior art, the prechamber plates 10 are arranged on both sides of a contact point 26, which is formed by a fixed contact piece 25 and a movable contact piece 27. The fixed contact piece 25 continues in an arc guide rail 28, which is guided to an arc extinguishing device 32 formed from quenching plates 30, which is arranged below a magnetic release 34.

Der weitere Aufbau des gezeigten Leitungsschutzschalters ist aus dem Stand der Technik bekannt, so daß hierauf nicht weiter eingegangen werden soll.The further construction of the line circuit breaker shown is known from the prior art, so that it will not be discussed further here.

Claims (9)

1. Niederspannungsschaltgerät, insbesondere Lei­tungsschutzschalter, mit einer Kontaktstelle (26), die in einer Lichtbogenkammer mit Vorkammerplatten (10), welche beiderseits die Lichtobogenkammer seitlich begren­zen, angeordnet sind, dadurch gekennzeichnet, daß die Vorkammerplatten (10) jeweils einen mit einem gasabge­benden Isoliermaterial umspritzten Kern aus ferromagne­tischem Material aufweisen, der mit ihrer Plattendicke (s) durchgreifenden Öffnungen (20) versehen ist, die ein Lochraster (22) bilden und deren Größe der Beziehung
Figure imgb0003
 folgt.1. Low-voltage switching device, in particular circuit breaker, with a contact point (26), which are arranged in an arc chamber with prechamber plates (10) which laterally delimit the arcing chamber on both sides, characterized in that the prechamber plates (10) are each extrusion-coated with a gas-emitting insulating material Have core made of ferromagnetic material, which is provided with its plate thickness (s) through openings (20), which form a hole pattern (22) and the size of the relationship
Figure imgb0003
 follows. 2. Niederspannungsschaltgerät nach Anspruch 1, da­durch gekennzeichnet, daß die Vorkammerplatten (10) ei­nen Kern aus Reineisen enthalten.2. Low-voltage switching device according to claim 1, characterized in that the prechamber plates (10) contain a core of pure iron. 3. Niederspannungsschaltgerät nach Anspruch 1, da­durch gekennzeichnet, daß die Vorkammerplatten (10) ei­nen Kern aus Nickel oder Nickellegierung enthalten.3. Low-voltage switching device according to claim 1, characterized in that the prechamber plates (10) contain a core made of nickel or nickel alloy. 4. Niederspannungsschaltgerät nach Anspruch 1, da­durch gekennzeichnet, daß das zum Umspritzen der Kerne der Vorkammerplatten (10) vorgesehene Isoliermaterial unter Einwirkung hoher Temperatur, welche vom Lichtbogen ausgeht, Gas abgibt.4. Low-voltage switching device according to claim 1, characterized in that the insulating material provided for the extrusion coating of the cores of the prechamber plates (10) releases gas under the action of high temperature emanating from the arc. 5. Niederspannungsschaltgerät nach Anspruch 1, da­durch gekennzeichnet, daß die Öffnungen (20) kreisrunden Querschnitt aufweisen.5. Low-voltage switching device according to claim 1, characterized in that the openings (20) have a circular cross section. 6. Niederspannungsschaltgerät nach einem der vorhe­rigen Ansprüche, dadurch gekennzeichnet, daß das aus den Öffnungen (20) gebildete Lochraster (22) parallel zu den Außenkanten (12, 14, 16, 18) der Vorkammerplatte (10) angeordnet ist.6. Low-voltage switching device according to one of the preceding claims, characterized in that the hole pattern (22) formed from the openings (20) is arranged parallel to the outer edges (12, 14, 16, 18) of the prechamber plate (10). 7. Niederspannungsschaltgerät nach einem der vorhe­rigen Ansprüche, dadurch gekennzeichnet, daß jede Öff­nung (20) zu den benachbarten Öffnungen (20) einen Min­destabstand gleich ihrem Durchmesser aufweist.7. Low-voltage switching device according to one of the preceding claims, characterized in that each opening (20) to the adjacent openings (20) has a minimum distance equal to their diameter. 8. Niederspannungsschaltgerät nach einem der vorhe­rigen Ansprüche, dadurch gekennzeichnet, daß die Öffnun­gen (20), die den Außenkanten (12, 14, 16, 18) der Vor­kammerplatte (10) benachbart sind, einen Kantenabstand aufweisen, der wenigstens dem Durchmesser einer Öffnung (20) entspricht.8. Low-voltage switching device according to one of the preceding claims, characterized in that the openings (20) which are adjacent to the outer edges (12, 14, 16, 18) of the prechamber plate (10) have an edge spacing which is at least the diameter of an opening ( 20) corresponds. 9. Niederspannungsschaltgerät nach einem der vorhe­rigen Ansprüche, dadurch gekennzeichnet, daß benachbarte Öffnungen (20) zueinander versetzt angeordnet sind.9. Low-voltage switching device according to one of the preceding claims, characterized in that adjacent openings (20) are arranged offset from one another.
EP19890112547 1988-07-15 1989-07-10 Low-voltage switch gear Withdrawn EP0350823A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883824025 DE3824025C2 (en) 1988-07-15 1988-07-15 Low voltage switchgear
DE3824025 1988-07-15

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EP0350823A3 EP0350823A3 (en) 1991-03-20

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DE3824025A1 (en) 1990-01-18
DE3824025C2 (en) 1994-02-17

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