EP0639843A1 - Arc extinguishing chamber in particular for load break switch - Google Patents

Arc extinguishing chamber in particular for load break switch Download PDF

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Publication number
EP0639843A1
EP0639843A1 EP94112610A EP94112610A EP0639843A1 EP 0639843 A1 EP0639843 A1 EP 0639843A1 EP 94112610 A EP94112610 A EP 94112610A EP 94112610 A EP94112610 A EP 94112610A EP 0639843 A1 EP0639843 A1 EP 0639843A1
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EP
European Patent Office
Prior art keywords
extinguishing
contact
chamber according
extinguishing chamber
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94112610A
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German (de)
French (fr)
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EP0639843B1 (en
Inventor
Fritz Hollmann
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Fritz Driescher Kg Spezialfabrik fur Elektrizitatswerksbedarf & Co GmbH
Original Assignee
Fritz Driescher Kg Spezialfabrik fur Elektrizitatswerksbedarf & Co GmbH
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Publication of EP0639843A1 publication Critical patent/EP0639843A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H33/121—Load break switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/08—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H33/10—Metal parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas

Definitions

  • the invention relates to an arcing chamber for switches, in particular for switch disconnectors in medium-voltage switchgear filled with extinguishing gas.
  • Quenching chambers of this type are known in a wide variety of designs, it being possible in principle to differentiate between open and closed quenching chambers.
  • the closed quenching chambers are hermetically sealed from the atmosphere surrounding them, be it air or another gas, of the switch housing, while the interior of the open quenching chambers is in gas exchange with the atmosphere of the switch housing.
  • the latter type is characterized above all by an inexpensive construction, which is often at the expense of the extinguishing effectiveness.
  • the object of the invention is to create an open quenching chamber which nevertheless has an efficiency which is comparable to that of the closed quenching chambers with a simple and therefore inexpensive construction.
  • the invention takes advantage of the fact that spaced-apart, mutually insulated metal sheets virtually suck an arc that forms during the switch-off process between opening contact pieces on their front edges and divide and deionize and thus extinguish them, and proposes the specified in the main claim Characteristics before.
  • the deion or extinguishing plates surround the movable contact circumferentially at least substantially completely at least in part of its path, the arc which arises when the contact is opened is detected in an extremely effective manner, taking advantage of its lability and evasive property in any direction between the Plates pressed, cut up, also cooled down and finally extinguished without it being able to evade.
  • the arc is controlled specifically during its existence.
  • the quenching plates surround the movable contact essentially over its entire circumference, as a possible embodiment also one in which the quenching plates have radially continuous slots or indentations or bulges and / or the like Have claim 15.
  • the fixed contact is an impact contact and the movable contact is a contact pin.
  • the quenching plates can be essentially vertical in their main plane aligned with the direction of movement of the movable contact as radial plates, which are preferably held parallel to one another by insulating spacers.
  • the extinguishing effect of the Deion sheets can be increased by their gassing, which is achieved in a particularly simple manner within the scope of the invention in that the extinguishing chamber housing is open on one end face and is provided with openings in the side walls.
  • the side openings in the quenching chamber housing enable an optimally working construction in that the radially aligned deion sheets can be arranged at the level of the side quenching chamber housing openings so that they are flushed from the outside by the gas of the switch housing, which in this construction is virtually free of deflection between the sheets of whose outer end faces can come here.
  • the shaft of the movable contact carries a radially oriented suction disc, which moves it participates; the suction disk is preferably arranged at such a distance from the contact pin tip that it is in the switched-on state below the quenching plate package essentially parallel to the quenching plates, while in the switched-off state it is at a distance from the lower quenching chamber housing edge. This ensures that there is not even the slightest risk of plastic bridging between the suction disc and thus the contact pin on the one hand and the arcing chamber housing on the other hand when it is switched off.
  • the suction disc can be used advantageously for guiding the contact pin if it has an outer diameter corresponding to the inner diameter of the arcing chamber housing, so that it can be supported all around on the inner wall of the housing.
  • the pin is supported via the suction disc during most of the switch-off process, and only on the last piece on which the suction disc leaves the arcing chamber housing should further support of the pin be possible , which can happen, for example, in that below the suction disc the shaft is provided with laterally projecting guide pins which slide at least temporarily and partially in a guide arranged below the arcing chamber housing.
  • An overall designated 1 quenching chamber or the like in a known manner within a switch housing. can be accommodated in the illustrated embodiment consists essentially of a housing 2 which has a bell shape, i.e. the side walls are inclined slightly diverging towards the end which is open towards the bottom.
  • the arcing chamber housing 2 is installed in the orientation shown, rather any other angular position, including the one rotated by 180 °, is possible.
  • the lower, open end and upper, closed end of the arcing chamber 1 are discussed below using the example shown.
  • a knock-in contact 3 (fixed contact) known as such is fastened, which interacts with a mating contact 4 projecting from below through the open quenching chamber housing 2, which is in the solid position in the switched-off position, while the dashed line Representation shows its switch-on position.
  • a package of metal plates 5 (deion plates), which are arranged at a distance from one another and are arranged parallel to one another and are aligned radially with respect to the movable contact 4, is fastened in the housing 2 and is kept at a mutual distance via insulating spacers 6 become.
  • the Deion- or extinguishing plates 5 each have a concentric recess, so that a total of a passage for the movable counter contact 4 remains open and the plates 5 surround the contact 4 as closely as possible in the switched-on state.
  • the height of the package is somewhat less than the stroke a of the movable mating contact 4 of the switch disconnector, for reasons that follow from the explanations below.
  • the movable contact 4 namely carries a collar-shaped, radially oriented suction disk 7, which is positively attached to the shaft of the contact 4 at a certain distance below the contact tip 8. Since the movable mating contact 4 is shown in solid lines in its switch-off position in the attached figures, the stroke a results as the distance between the dashed (contact) and the solid (switch-off) position.
  • the illustrations also make it clear that the distance between the suction disc 7 and the contact tip 8 is selected such that the suction disc is positioned in the switched-on position at a short distance below the quenching plate package, i.e. the part of the contact 4 located above the suction disc 7 extends completely through the extinguishing plates 5.
  • the illustrations also show that the mutual dimensions and the stroke are preferably selected so that the contact tip 8 remains slightly below the quenching plate stack in the switched-off position.
  • the suction disk 7 is then at a distance b from the inner wall 9 of the arcing chamber housing 2 for the purpose of interrupting the bridge, which is designed to open conically at its lower end.
  • This shape of the lower edge of the housing has both fluidic advantages for the gas flowing through the quenching chamber 1 and insertion properties for the suction disc 7 into the interior of the housing (funnel effect), because the suction disc is adapted with its outer diameter to the inner diameter of the housing 2, so that it over most of the way of the movable contact 4 abuts the inner wall of the housing 2 and thus leads the pin safely.
  • this suction disk 7 The main purpose of this suction disk 7 is, however, to support the extinguishing function of the deion sheets, at the height of which openings 11 are provided in the housing 2, through which gas is produced when the contact 4 moves downward, that is to say in the event of switching off due to the circumferential contact of the suction disk 7 on the housing inner wall from the environment - in the illustrated embodiment, the SF6 gas, with which the switch housing in which the quenching chamber is housed - is sucked from the outside between the quenching plates 5, swirls there and supports the quenching function of the quenching plates 5 quite considerably. With this construction, the otherwise uncontrollable arc is encompassed in a controlled manner, divided, pressed or sucked into the spaces between the quenching plates and then quenched.
  • Fig. 2 shows the lower guide area for the movable counter contact 4, and preferably in the form of one or more guide plates 12, which is or are each provided with an elongated hole 13, which follow above, ie slightly open towards the quenching chamber 1 and in which at least one laterally protruding pin 14a is guided, above which, in the exemplary embodiment shown, a further guide pin 14b is positively connected to the contact pin 4.
  • the distance of the pin 14b from the suction disk is selected so that the pin 14b, when guided, engages in the elongated hole 13 at which the suction disk 7 leaves the part of the inner wall of the housing 2 which guides it. This ensures safe contact pin guidance.
  • the invention creates a quenching chamber of the open type which requires little effort and is nevertheless effective, and which is also extremely easy to maintain.

Abstract

An arc extinguishing chamber (1) for switches (circuit breakers), especially for load break switches (load disconnector circuit breakers) in medium-voltage switching installations filled with extinguishing gas, having a stationary contact (3) in an open arc extinguishing chamber housing (2), a moving contact (4) and at least two arc extinguishing plates (5) which are arranged parallel to one another and essentially surround the path of the moving contact (4) at least over part of its length, has a simple and thus cost-effective construction and at the same time has an efficiency which is comparable to closed arc extinguishing chambers. <IMAGE>

Description

Die Erfindung betrifft eine Löschkammer für Schalter, insbesondere für Lasttrennschalter in mit Löschgas gefüllten Mittelspannungsschaltanlagen.The invention relates to an arcing chamber for switches, in particular for switch disconnectors in medium-voltage switchgear filled with extinguishing gas.

Derartige Löschkammern sind in den verschiedensten Ausführungen bekannt, wobei grundsätzlich in offene und geschlossene Löschkammern unterschieden werden kann. Die geschlossenen Löschkammern sind gegenüber der sie umgebenden Atmosphäre, sei es Luft oder ein anderes Gas, des Schaltergehäuses hermetisch abgeschlossen, während das Innere der offenen Löschkammern im Gasaustausch mit der Atmosphäre des Schaltergehäuses steht. Die letztgenannte Art zeichnet sich vor allem durch eine kostengünstige Bauweise aus, was häufig zu Lasten der Löscheffektivität geht.Quenching chambers of this type are known in a wide variety of designs, it being possible in principle to differentiate between open and closed quenching chambers. The closed quenching chambers are hermetically sealed from the atmosphere surrounding them, be it air or another gas, of the switch housing, while the interior of the open quenching chambers is in gas exchange with the atmosphere of the switch housing. The latter type is characterized above all by an inexpensive construction, which is often at the expense of the extinguishing effectiveness.

Aufgabe der Erfindung ist es, eine offene Löschkammer zu schaffen, die bei einfachem und damit kostengünstigem Aufbau gleichwohl eine den geschlossenen Löschkammern vergleichbare Effizienz besitzt.The object of the invention is to create an open quenching chamber which nevertheless has an efficiency which is comparable to that of the closed quenching chambers with a simple and therefore inexpensive construction.

Zur Lösung macht sich die Erfindung die Tatsache zunutze, daß mit Abstand zueinander angeordnete, gegeneinander isolierte Metallbleche einen sich während des Ausschaltvorganges zwischen sich öffnenden Kontaktstücken bildenden Lichtbogen quasi an ihre Stirnkanten saugen und dort zerteilen und deionisieren und damit löschen, und schlägt die im Hauptanspruch angegebenen Merkmale vor.To solve the problem, the invention takes advantage of the fact that spaced-apart, mutually insulated metal sheets virtually suck an arc that forms during the switch-off process between opening contact pieces on their front edges and divide and deionize and thus extinguish them, and proposes the specified in the main claim Characteristics before.

Dadurch, daß die Deion- bzw. Löschbleche den beweglichen Kontakt zumindest auf einem Teil seines Weges umfangsmäßig zumindest im wesentlichen vollständig umgeben, wird der beim Öffnen des Kontaktes entstehende Lichtbogen in äußerst effektiver Weise unter Ausnutzung seiner Labilität und Ausweicheigenschaft in jeder Richtung erfaßt, zwischen die Platten gedrückt, zerteilt, dabei auch abgekühlt und schließlich zum Erlöschen gebracht, ohne daß er ausweichen kann. Mit der Erfindung wird der Lichtbogen also während seiner Existenz gezielt kontrolliert.The fact that the deion or extinguishing plates surround the movable contact circumferentially at least substantially completely at least in part of its path, the arc which arises when the contact is opened is detected in an extremely effective manner, taking advantage of its lability and evasive property in any direction between the Plates pressed, cut up, also cooled down and finally extinguished without it being able to evade. With the invention, the arc is controlled specifically during its existence.

Im Rahmen der Erfindung bedeutet die Tatsache, daß die Löschbleche den beweglichen Kontakt im wesentlichen über seinen gesamten Umfang umgeben, als Ausführungsmöglichkeit auch eine solche, bei der die Löschbleche radial durchgehende Schlitze oder auch Ein- bzw. Ausbuchtungen und/oder dgl. Modifikationen gemäß dem Patentanspruch 15 aufweisen.In the context of the invention, the fact that the quenching plates surround the movable contact essentially over its entire circumference, as a possible embodiment also one in which the quenching plates have radially continuous slots or indentations or bulges and / or the like Have claim 15.

Eine besonders kompakte und effektive Bauweise ergibt sich dann, wenn nach einem Vorzugsmerkmal der Erfindung der Festkontakt ein Einschlagkontakt und der bewegliche Kontakt ein Kontaktstift ist. In diesem Fall können dann die Löschbleche in ihrer Hauptebene im wesentlichen senkrecht zur Bewegungsrichtung des beweglichen Kontakts als Radialbleche ausgerichtet sein, die vorzugsweise durch isolierende Distanzstücke parallel zueinander gehalten werden.A particularly compact and effective design is obtained if, according to a preferred feature of the invention, the fixed contact is an impact contact and the movable contact is a contact pin. In this case, the quenching plates can be essentially vertical in their main plane aligned with the direction of movement of the movable contact as radial plates, which are preferably held parallel to one another by insulating spacers.

Die Löschwirkung der Deion-Bleche kann durch ihre Begasung noch erhöht werden, was in besonders einfacher Weise im Rahmen der Erfindung dadurch erreicht wird, daß das Löschkammergehäuse an einer Stirnseite offen und in den Seitenwänden mit Öffnungen versehen ist. Dadurch entsteht bei einem vorzugsweise im wesentlichen zylinderförmigen Gehäuse eine Art Glocke mit seitlichen Öffnungen, bei der die "Klöppelseite", durch die der bewegliche Kontaktstift ragt, komplett offen ist, während der Festkontakt an der geschlossenen Seite des Löschkammergehäuses befestigt ist, wobei die Ausrichtung der Löschkammer innerhalb des Schaltergehäuses je nach den Forderungen und konstruktiven Zweckmäßigkeiten jede Lage einnehmen kann und hier nur der Einfachheit halber eine Lage beschrieben wird, bei der der Festkontakt oben angeordnet ist.The extinguishing effect of the Deion sheets can be increased by their gassing, which is achieved in a particularly simple manner within the scope of the invention in that the extinguishing chamber housing is open on one end face and is provided with openings in the side walls. This creates in a preferably substantially cylindrical housing a type of bell with side openings, in which the "bobbin side" through which the movable contact pin protrudes is completely open, while the fixed contact is attached to the closed side of the arcing chamber housing, the orientation of the Arcing chamber within the switch housing can assume any position depending on the requirements and design expediencies and only a position is described here for the sake of simplicity, in which the fixed contact is arranged at the top.

Die seitlichen Öffnungen im Löschkammergehäuse ermöglichen insofern eine optimal arbeitende Bauweise, als die radial ausgerichteten Deion-Bleche in Höhe der seitlichen Löschkammergehäuseöffnungen angeordnet werden können, so daß sie von außen vom Gas des Schaltergehäuses umspült werden, das bei dieser Bauweise quasi umlenkungsfrei zwischen die Bleche von deren äußeren Stirnseiten her gelangen kann.The side openings in the quenching chamber housing enable an optimally working construction in that the radially aligned deion sheets can be arranged at the level of the side quenching chamber housing openings so that they are flushed from the outside by the gas of the switch housing, which in this construction is virtually free of deflection between the sheets of whose outer end faces can come here.

Dieser Effekt kann noch erheblich dadurch erhöht werden, daß der Schaft des beweglichen Kontaktes eine radial ausgerichtete Saugscheibe trägt, die dessen Bewegungen mitmacht; dabei ist die Saugscheibe vorzugsweise mit einem derartigen Abstand von der Kontaktstiftspitze entfernt angeordnet, daß sie sich im eingeschalteten Zustand unterhalb des Löschplattenpaketes im wesentlichen parallel zu den Löschplatten befindet, während sie im ausgeschalteten Zustand Abstand vom unteren Löschkammergehäuserand aufweist. Damit wird sichergestellt, daß auch nicht die geringste Gefahr einer Kunststoffbrückenbildung zwischen Saugscheibe und damit Kontaktstift einerseits und Löschkammergehäuse andererseits im ausgeschalteten Zustand besteht.This effect can be significantly increased by the fact that the shaft of the movable contact carries a radially oriented suction disc, which moves it participates; the suction disk is preferably arranged at such a distance from the contact pin tip that it is in the switched-on state below the quenching plate package essentially parallel to the quenching plates, while in the switched-off state it is at a distance from the lower quenching chamber housing edge. This ensures that there is not even the slightest risk of plastic bridging between the suction disc and thus the contact pin on the one hand and the arcing chamber housing on the other hand when it is switched off.

Im übrigen kann die Saugscheibe in vorteilhafter Weise für die Führung des Kontaktstiftes genutzt werden, wenn sie einen dem Innendurchmesser des Löschkammergehäuses entsprechenden Außendurchmesser besitzt, so daß sie sich rundum an der Gehäuseinnenwand abstützen kann. Um den zuvor erwähnten Abstand vom unteren Löschkammergehäuserand zu wahren, findet die Stiftabstützung über die Saugscheibe während des größten Teils des Ausschaltvorganges statt, und nur auf dem letzten Stück, auf dem die Saugscheibe das Löschkammergehäuse verläßt, muß möglichst für eine weitere Abstützung des Stiftes gesorgt werden, was beispielsweise dadurch geschehen kann, daß unterhalb der Saugscheibe der Schaft mit seitlich hervorragenden Führungsstiften versehen ist, die zumindest zeit- und teilweise in einer unterhalb des Löschkammergehäuses angeordneten Führung gleiten.Otherwise, the suction disc can be used advantageously for guiding the contact pin if it has an outer diameter corresponding to the inner diameter of the arcing chamber housing, so that it can be supported all around on the inner wall of the housing. In order to maintain the above-mentioned distance from the lower edge of the arcing chamber, the pin is supported via the suction disc during most of the switch-off process, and only on the last piece on which the suction disc leaves the arcing chamber housing should further support of the pin be possible , which can happen, for example, in that below the suction disc the shaft is provided with laterally projecting guide pins which slide at least temporarily and partially in a guide arranged below the arcing chamber housing.

Anhand eines in der Zeichnung dargestellten Ausführungsbeispiels wird die Erfindung nachfolgend näher erläutert. Es zeigen:

Fig. 1
den Querschnitt einer Löschkammer; und
Fig. 2
die in Fig. 1 dargestellte Löschkammer mit einer Möglichkeit einer Kontaktstiftführung.
Based on an embodiment shown in the drawing, the invention is explained in more detail below. Show it:
Fig. 1
the cross section of an arcing chamber; and
Fig. 2
the quenching chamber shown in Fig. 1 with a possibility of a contact pin guide.

Eine insgesamt mit 1 bezeichnete Löschkammer, die in bekannter Weise innerhalb eines Schaltgehäuses od.dgl. untergebracht sein kann, besteht im dargestellten Ausführungsbeispiel im wesentlichen aus einem Gehäuse 2, das Glockenform besitzt, d.h. die Seitenwände sind nach zum unten hin offenen Ende leicht nach außen divergierend geneigt. Wie bereits erwähnt, ist es für die Erfindung nicht unbedingt notwendig, daß das Löschkammergehäuse 2 in der dargestellten Ausrichtung eingebaut wird, vielmehr ist jede andere Winkellage, einschließlich der um 180° gedrehten möglich. Zur Vereinfachung der Erläuterung wird nachfolgend am dargestellten Beispiel vom unteren, offenen Ende und oberen, geschlossenen Ende der Löschkammer 1 gesprochen.An overall designated 1 quenching chamber or the like in a known manner within a switch housing. can be accommodated in the illustrated embodiment consists essentially of a housing 2 which has a bell shape, i.e. the side walls are inclined slightly diverging towards the end which is open towards the bottom. As already mentioned, it is not absolutely necessary for the invention that the arcing chamber housing 2 is installed in the orientation shown, rather any other angular position, including the one rotated by 180 °, is possible. In order to simplify the explanation, the lower, open end and upper, closed end of the arcing chamber 1 are discussed below using the example shown.

Am oberen, geschlossenen Ende des Löschkammergehäuses 2 ist ein als solcher bekannter Einschlagkontakt 3 (Festkontakt) befestigt, der mit einem von unten durch das offene Löschkammergehäuse 2 ragenden Gegenkontakt 4 zusammenwirkt, der sich in der durchgezogen dargestellten Position in der Ausschaltstellung befindet, während die gestrichelte Darstellung seine Einschaltposition zeigt.At the upper, closed end of the quenching chamber housing 2, a knock-in contact 3 (fixed contact) known as such is fastened, which interacts with a mating contact 4 projecting from below through the open quenching chamber housing 2, which is in the solid position in the switched-off position, while the dashed line Representation shows its switch-on position.

Unterhalb des Festkontaktes 3 ist ein Paket aus mit Abstand zueinander parallel angeordneten, radial zum beweglichen Kontakt 4 ausgerichteten Metallblechen 5 (Deionbleche) im Gehäuse 2 befestigt, die über isolierende Distanzscheiben 6 auf gegenseitigen Abstand gehalten werden. Die Deion- bzw. Löschbleche 5 haben jeweils eine konzentrische Ausnehmung, so daß insgesamt ein Durchtrittsweg für den beweglichen Gegenkontakt 4 offenbleibt und die Bleche 5 den Kontakt 4 im eingeschalteten Zustand möglichst eng umgeben. Die Höhe des Paketes ist im dargestellten Ausführungsbeispiel etwas geringer als der Hub a des beweglichen Gegenkontakts 4 des Lasttrennschalters, und zwar aus sich aus den nachfolgenden Ausführungen ergebenden Gründen.Beneath the fixed contact 3, a package of metal plates 5 (deion plates), which are arranged at a distance from one another and are arranged parallel to one another and are aligned radially with respect to the movable contact 4, is fastened in the housing 2 and is kept at a mutual distance via insulating spacers 6 become. The Deion- or extinguishing plates 5 each have a concentric recess, so that a total of a passage for the movable counter contact 4 remains open and the plates 5 surround the contact 4 as closely as possible in the switched-on state. In the exemplary embodiment shown, the height of the package is somewhat less than the stroke a of the movable mating contact 4 of the switch disconnector, for reasons that follow from the explanations below.

Der bewegliche Kontakt 4 trägt nämlich eine kragenförmig radial ausgerichtete Saugscheibe 7, die am Schaft des Kontaktes 4 mit gewissem Abstand unterhalb der Kontaktspitze 8 formschlüssig befestigt ist. Da in den beigefügten Figuren der bewegliche Gegenkontakt 4 in durchgezogenen Linien in seiner Ausschaltposition dargestellt ist, ergibt sich der Hub a als der Abstand zwischen der gestrichelten (Kontakt-) und der durchgezogenen (Ausschalt)Position. Die Darstellungen machen auch deutlich, daß der Abstand der Saugscheibe 7 von der Kontaktspitze 8 so gewählt ist, daß die Saugscheibe in Einschaltposition mit geringem Abstand unterhalb des Löschblechpaketes positioniert ist, d.h. der oberhalb der Saugscheibe 7 sich befindende Teil des Kontaktes 4 durchragt die Löschbleche 5 komplett.The movable contact 4 namely carries a collar-shaped, radially oriented suction disk 7, which is positively attached to the shaft of the contact 4 at a certain distance below the contact tip 8. Since the movable mating contact 4 is shown in solid lines in its switch-off position in the attached figures, the stroke a results as the distance between the dashed (contact) and the solid (switch-off) position. The illustrations also make it clear that the distance between the suction disc 7 and the contact tip 8 is selected such that the suction disc is positioned in the switched-on position at a short distance below the quenching plate package, i.e. the part of the contact 4 located above the suction disc 7 extends completely through the extinguishing plates 5.

Andererseits zeigen die Darstellungen auch, daß die gegenseitigen Abmessungen und der Hub vorzugsweise so gewählt werden, daß in der Ausschaltstellung die Kontaktspitze 8 geringfügig unterhalb des Löschblechpaketes verharrt. Gleichzeitig befindet sich dann die Saugscheibe 7 zu dem oben angegebenen Zweck der Brückenunterbrechung im Abstand b zur Innenwand 9 des Löschkammergehäuses 2, das an seinem unteren Ende konisch nach außen sich öffnend ausgebildet ist.On the other hand, the illustrations also show that the mutual dimensions and the stroke are preferably selected so that the contact tip 8 remains slightly below the quenching plate stack in the switched-off position. At the same time, the suction disk 7 is then at a distance b from the inner wall 9 of the arcing chamber housing 2 for the purpose of interrupting the bridge, which is designed to open conically at its lower end.

Diese Form des unteren Gehäuserandes hat sowohl strömungstechnische Vorteile für das die Löschkammer 1 durchströmende Gas als auch Einführungseigenschaften für die Saugscheibe 7 in das Innere des Gehäuses (Trichtereffekt), denn die Saugscheibe ist mit ihrem Außendurchmesser dem Innendurchmesser des Gehäuses 2 angepaßt, so daß sie über den größten Teil des Weges des beweglichen Kontaktes 4 der Innenwand des Gehäuses 2 anliegt und damit den Stift sicher führt.This shape of the lower edge of the housing has both fluidic advantages for the gas flowing through the quenching chamber 1 and insertion properties for the suction disc 7 into the interior of the housing (funnel effect), because the suction disc is adapted with its outer diameter to the inner diameter of the housing 2, so that it over most of the way of the movable contact 4 abuts the inner wall of the housing 2 and thus leads the pin safely.

Der Hauptzweck dieser Saugscheibe 7 ist jedoch die Unterstützung der Löschfunktion der Deionbleche, auf deren Höhe im Gehäuse 2 rundum Öffnungen 11 vorgesehen sind, durch die bei einer Abwärtsbewegung des Kontaktes 4, also im Falle des Ausschaltens aufgrund der Umfangsanlage der Saugscheibe 7 an der Gehäuseinnenwand Gas aus der Umgebung - im dargestellten Ausführungsbeispiel das SF₆-Gas, mit dem das Schaltgehäuse gefüllt ist, in dem die Löschkammer untergebracht ist - von außen zwischen die Löschbleche 5 gesaugt wird, sich dort verwirbelt und die Löschfunktion der Löschbleche 5 ganz erheblich unterstützt. Mit dieser Konstruktion wird der ansonsten unkontrollierbare Lichtbogen kontrolliert umfaßt, zerteilt, in die Zwischenräume zwischen den Löschblechen gedrückt bzw. gesogen und dann gelöscht.The main purpose of this suction disk 7 is, however, to support the extinguishing function of the deion sheets, at the height of which openings 11 are provided in the housing 2, through which gas is produced when the contact 4 moves downward, that is to say in the event of switching off due to the circumferential contact of the suction disk 7 on the housing inner wall from the environment - in the illustrated embodiment, the SF₆ gas, with which the switch housing in which the quenching chamber is housed - is sucked from the outside between the quenching plates 5, swirls there and supports the quenching function of the quenching plates 5 quite considerably. With this construction, the otherwise uncontrollable arc is encompassed in a controlled manner, divided, pressed or sucked into the spaces between the quenching plates and then quenched.

Fig. 2 zeigt den unteren Führungsbereich für den beweglichen Gegenkontakt 4, und zwar vorzugsweise in Form eines oder mehrerer Führungsbleche 12, das bzw. die mit je einem Langloch 13 versehen ist bzw. sind, die sich nach oben, d.h. zur Löschkammer 1 hin konisch leicht öffnen und in denen mindestens ein seitlich hervorragender Stift 14a geführt ist, oberhalb dessen im dargestellten Ausführungsbeispiel ein weiterer Führungsstift 14b formschlüssig mit dem Kontaktstift 4 verbunden ist. Der Abstand des Stiftes 14b von der Saugscheibe ist so gewählt, daß der Stift 14b in dem Moment geführt in das Langloch 13 greift, zu dem die Saugscheibe 7 den sie führenden Teil der Innenwand des Gehäuses 2 verläßt. Damit ist eine sichere Kontaktstiftführung gewährleistet.Fig. 2 shows the lower guide area for the movable counter contact 4, and preferably in the form of one or more guide plates 12, which is or are each provided with an elongated hole 13, which follow above, ie slightly open towards the quenching chamber 1 and in which at least one laterally protruding pin 14a is guided, above which, in the exemplary embodiment shown, a further guide pin 14b is positively connected to the contact pin 4. The distance of the pin 14b from the suction disk is selected so that the pin 14b, when guided, engages in the elongated hole 13 at which the suction disk 7 leaves the part of the inner wall of the housing 2 which guides it. This ensures safe contact pin guidance.

Die Erfindung schafft eine wenig Aufwand erfordernde und trotzdem wirkungsvolle Löschkammer der offenen Bauart, die zudem äußerst wartungsfreundlich ist.The invention creates a quenching chamber of the open type which requires little effort and is nevertheless effective, and which is also extremely easy to maintain.

Claims (15)

Löschkammer für Schalter, insbesondere für Lasttrennschalter in mit Löschgas gefüllten Mittelspannungsschaltanlagen, mit - einem feststehenden Kontakt (Festkontakt) (3) in einem offenen Löschkammergehäuse (1) - einem beweglichen (Gegen)kontakt (4) und - mindestens zwei parallel zueinander angeordneten auf zumindest einem Teil seines Weges den beweglichen Kontakt (4) im wesentlichen über seinen gesamten Umfang umgebenden Löschblechen (5). Arcing chamber for switches, especially for switch disconnectors in medium-voltage switchgear filled with extinguishing gas, with - a fixed contact (fixed contact) (3) in an open arcing chamber housing (1) - a movable (counter) contact (4) and - At least two parallel to each other arranged on at least part of its way the movable contact (4) substantially over its entire circumference quenching plates (5). Löschkammer nach Anspruch 1, dadurch gekennzeichnet, daß der Festkontakt (3) ein Einschlagkontakt und der bewegliche Kontakt (4) ein Kontaktstift ist.Extinguishing chamber according to claim 1, characterized in that the fixed contact (3) is an impact contact and the movable contact (4) is a contact pin. Löschkammer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Löschkammergehäuse (2) an einer Stirnseite offen und in den Seitenwänden mit Öffnungen (11) versehen ist.Extinguishing chamber according to claim 1 or 2, characterized in that the extinguishing chamber housing (2) is open on one end face and is provided with openings (11) in the side walls. Löschkammer nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Festkontakt (3) an der geschlossenen Seite des Löschkammergehäuses (2) befestigt ist.Arcing chamber according to one or more of claims 1 to 3, characterized in that the fixed contact (3) is attached to the closed side of the arcing chamber housing (2). Löschkammer nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Löschbleche (5) mit ihrer Hauptebene im wesentlichen senkrecht zur Bewegungsrichtung des beweglichen Kontakts ausgerichtet sind (Radialbleche)Extinguishing chamber according to one or more of claims 1 to 4, characterized in that the extinguishing plates (5) are aligned with their main plane substantially perpendicular to the direction of movement of the movable contact (radial plates) Löschkammer nach Anspruch 5, dadurch gekennzeichnet, daß die Löschbleche (5) in Höhe der seitlichen Löschkammergehäuseöffnungen (11) angeordnet sind.Extinguishing chamber according to claim 5, characterized in that the extinguishing plates (5) are arranged at the level of the lateral extinguishing chamber housing openings (11). Löschkammer nach einem oder mehreren der Ansprüche 1 bis 6, gekennzeichnet durch isolierende Distanzstücke (6) zwischen den Löschblechen (5).Extinguishing chamber according to one or more of claims 1 to 6, characterized by insulating spacers (6) between the extinguishing plates (5). Löschkammer nach einem oder mehreren der Ansprüche 1 bis 7, gekennzeichnet durch eine außerhalb des Löschkammergehäuses (2) angeordnete Führung (12) für den Kontaktstift.Arcing chamber according to one or more of claims 1 to 7, characterized by a guide (12) for the contact pin arranged outside the arcing chamber housing (2). Löschkammer nach Anspruch 8, gekennzeichnet durch einen Führungsschaft des Kontaktstifts (4) mit mindestens zwei vertikal zur Stiftlängsachse sich erstreckenden Führungsstiften (14a, b).Arcing chamber according to claim 8, characterized by a guide shaft of the contact pin (4) with at least two guide pins (14a, b) extending vertically to the longitudinal axis of the pin. Löschkammer nach Anspruch 9, gekennzeichnet durch eine unterhalb des Löschkammergehäuses (2) angeordnete Führung für den Schaft des beweglichen Kontaktes.Arcing chamber according to claim 9, characterized by a guide for the shaft of the movable contact arranged below the arcing chamber housing (2). Löschkammer nach Anspruch 10, gekennzeichnet durch mindestens ein Führungsblech (12) mit Langloch (13).Extinguishing chamber according to claim 10, characterized by at least one guide plate (12) with an elongated hole (13). Löschkammer nach einem oder mehreren der Ansprüche 1 bis 11, gekennzeichnet durch eine am Schaft befestigte, dessen Bewegungen mitmachende Saugscheibe (7).Extinguishing chamber according to one or more of claims 1 to 11, characterized by a suction disk (7) fastened to the shaft and participating in its movements. Löschkammer nach Anspruch 12, dadurch gekennzeichnet, daß der Außendurchmesser der radial ausgerichteten Saugscheibe (7) unter Gleitpassung dem Innendurchmesser des Löschkammergehäuses (2) entspricht.Extinguishing chamber according to claim 12, characterized in that the outer diameter of the radially oriented suction disc (7) corresponds to the inner diameter of the extinguishing chamber housing (2) with a sliding fit. Löschkammer nach Anspruch 12 oder 13, dadurch gekennzeichnet, daß die Saugscheibe (7) mit einem derartigen Abstand von der Kontaktstiftspitze (8) angeordnet ist, daß sie in ausgeschaltetem Zustand Abstand vom unteren Gehäuserand (9) hält.Extinguishing chamber according to claim 12 or 13, characterized in that the suction disc (7) is arranged at such a distance from the contact pin tip (8) that it keeps the distance from the lower housing edge (9) when switched off. Löschkammer nach einem oder mehreren der Ansprüche 1 bis 14, dadurch gekennzeichnet, daß die Löschbleche (5) Schlitze, Einbuchtungen, Ausbuchtungen, Ausnehmungen und/oder Prägungen besitzen.Extinguishing chamber according to one or more of claims 1 to 14, characterized in that the extinguishing plates (5) have slots, indentations, indentations, recesses and / or embossments.
EP94112610A 1993-08-19 1994-08-12 Switch with arc extinguishing chamber in particular load break switch Expired - Lifetime EP0639843B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4327844A DE4327844A1 (en) 1993-08-19 1993-08-19 Arcing chamber for switches, especially for switch disconnectors
DE4327844 1993-08-19

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EP0639843A1 true EP0639843A1 (en) 1995-02-22
EP0639843B1 EP0639843B1 (en) 1997-03-19

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AT (1) ATE150583T1 (en)
DE (2) DE4327844A1 (en)
NO (1) NO306432B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10013549B4 (en) * 2000-03-20 2006-08-10 Fritz Driescher KG Spezialfabrik für Elektrizitätswerksbedarf GmbH & Co Arrangement of a switch

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19627098A1 (en) * 1996-07-05 1998-01-08 Asea Brown Boveri Circuit breaker

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE272742C (en) *
FR696259A (en) * 1929-09-11 1930-12-29 Alsthom Cgee Further development of electric switches operating in gas
CH178662A (en) * 1934-10-20 1935-07-31 Spaelti Soehne & Co Device for interrupting arcs.
DE732000C (en) * 1940-06-05 1943-02-19 Lindner & Co Circuit breaker with arc extinguishing according to the suction gas principle
FR87927E (en) * 1964-10-21 1966-01-24 Merlin Gerin Arc extinguishing device
FR2034118A1 (en) * 1969-02-05 1970-12-11 Kesl Karel
DE2231195A1 (en) * 1972-06-26 1974-01-17 Driescher Eltech Werk LOAD SWITCH OR CIRCUIT BREAKER
CH553476A (en) * 1973-10-11 1974-08-30 Sprecher & Schuh Ag COMPRESSED GAS CIRCUIT BREAKER FOR HIGH VOLTAGE.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE272742C (en) *
FR696259A (en) * 1929-09-11 1930-12-29 Alsthom Cgee Further development of electric switches operating in gas
CH178662A (en) * 1934-10-20 1935-07-31 Spaelti Soehne & Co Device for interrupting arcs.
DE732000C (en) * 1940-06-05 1943-02-19 Lindner & Co Circuit breaker with arc extinguishing according to the suction gas principle
FR87927E (en) * 1964-10-21 1966-01-24 Merlin Gerin Arc extinguishing device
FR2034118A1 (en) * 1969-02-05 1970-12-11 Kesl Karel
DE2231195A1 (en) * 1972-06-26 1974-01-17 Driescher Eltech Werk LOAD SWITCH OR CIRCUIT BREAKER
CH553476A (en) * 1973-10-11 1974-08-30 Sprecher & Schuh Ag COMPRESSED GAS CIRCUIT BREAKER FOR HIGH VOLTAGE.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10013549B4 (en) * 2000-03-20 2006-08-10 Fritz Driescher KG Spezialfabrik für Elektrizitätswerksbedarf GmbH & Co Arrangement of a switch

Also Published As

Publication number Publication date
NO306432B1 (en) 1999-11-01
NO942876L (en) 1995-02-20
NO942876D0 (en) 1994-08-03
DE4327844A1 (en) 1995-02-23
ATE150583T1 (en) 1997-04-15
DE59402124D1 (en) 1997-04-24
EP0639843B1 (en) 1997-03-19

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