EP0664553B1 - High-voltage power circuit breaker with a heating chamber - Google Patents

High-voltage power circuit breaker with a heating chamber Download PDF

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Publication number
EP0664553B1
EP0664553B1 EP94250299A EP94250299A EP0664553B1 EP 0664553 B1 EP0664553 B1 EP 0664553B1 EP 94250299 A EP94250299 A EP 94250299A EP 94250299 A EP94250299 A EP 94250299A EP 0664553 B1 EP0664553 B1 EP 0664553B1
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EP
European Patent Office
Prior art keywords
channel
heating chamber
bridging contact
arc
space
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EP94250299A
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German (de)
French (fr)
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EP0664553A1 (en
Inventor
Hold Dr. Dienemann
Hartmut Dr. Knobloch
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Siemens AG
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Siemens AG
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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
    • H01H33/70—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
    • H01H33/901—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 making use of the energy of the arc or an auxiliary arc

Definitions

  • the invention relates to a high-voltage circuit breaker with two mutually coaxially opposed, hollow for the discharge of extinguishing gas switching contact pieces, between which an arc space is formed and with this coaxially drivable bridging contact piece and with the bridging contact piece in its switch-on position coaxially surrounding the first heating chamber for the extinguishing gas, which is connected to the arc chamber in the switched-off state by means of a first channel which is closed by the bridging contact piece in the switched-on state.
  • Such a high-voltage circuit breaker is known for example from DE-OS 41 03 119.
  • a switch is known with a plurality of heating rooms, some of which are connected to one another and which are successively connected to the arc room.
  • the arrangement of these boiler rooms axially one behind the other requires a large length of the switch and a long switching distance of the drivable contact piece.
  • the invention has for its object that in a high-voltage circuit breaker of the type mentioned To further improve extinguishing behavior while keeping the necessary drive energies as low as possible.
  • a second heating chamber is provided which is connected to the arc chamber in the switched-off state by means of a second channel closed by the bridging contact piece in the switched-on state, in that the second and the first channel are released by the bridging contact piece at different times during the switching-off process be that the bridging contact piece is arranged in the switched-on state substantially within the second heating space and that the first heating space surrounds the second heating space and is essentially limited by elements made of insulating material.
  • the channels can, for example, be formed particularly simply by the arc space and temporarily ring channels coaxially surrounding the bridging contact piece.
  • the invention can also be advantageously configured in that the first heating chamber is connected via a channel to a compression chamber in which the extinguishing gas is mechanically compressed.
  • extinguishing gas can be provided in a manner known per se by a mechanical compression device even in the case in which only a low-current arc is present, so that the heating of the extinguishing gas is not sufficient for a sufficient extinguishing gas flow to occur.
  • the mechanically compressed quenching gas can assist the quenching gas provided by high-pressure arc heating to extinguish the arc.
  • the figure shows a part of a high-voltage circuit breaker with two mutually opposite, hollow switching contact pieces 1, 2 which are bridged by the bridging contact piece 3 in the switched-on state.
  • the figure shows this switch-on state in the lower half-section and the switch-off state in the upper half-section.
  • An arc space 13 is formed between the switch contact pieces 1, 2, in which an arc burns temporarily between the switch contact pieces 1, 2 when the switch is switched off.
  • a first heating space 4 coaxially surrounds the switching contact pieces 1, 2 and the arc space 3. It is delimited by a first insulating element 5, a second insulating element 6 and a cylinder jacket 7 and has an annular channel 8 for the discharge of the quenching gas into the arc space 3.
  • an intermediate space 9 is formed, which the bridging contact piece 3 essentially fills in the switched-on state.
  • the bridging contact piece 3 releases this space 9.
  • the contact fingers 10 of the bridging contact piece 3 have expired from the switching contact piece 2 and the arcing contact 11 of the bridging contact piece 3 is at a distance from the switching contact piece 2, an arc is drawn there and at the same time an annular channel 20 is released, which connects the space 9 with the arcing space 3 .
  • the space 9 filled by the bridging contact piece 3 when it is switched on is thus available as a second heating space for the quenching gas heated by the arc.
  • the second insulating material element 6 is shaped so that the ring channel 8 between the first heating space and the arc space 3 is only released by the bridging contact piece 3 after the bridging contact piece 3 has expired from the switching contact piece 2, i. H. after the connecting channel 20 between the second heating chamber 9 and the arc chamber 3 has been at least partially released by the bridging contact piece 3.
  • the second insulating element 6 has a circumferential web 12, the height of which is designed such that the ring channel 8 is released by the bridging contact piece 3 at a suitable time.
  • a compression space 14 is also provided, in which the extinguishing gas is mechanically compressed.
  • a movable compression piston 15 is mechanically connected to the switch drive via a drive rod 16, which also drives the bridging contact piece 3.
  • the compression space 14 is arranged on the drive side of the switch, so that the compression space 14 is located on the side of the movable compression piston 15 facing the drive. From there, the compressed extinguishing gas is passed via an axially extending channel 17 to the first heating chamber 4, into which it is introduced via a check valve 18.
  • the switch construction as shown in the figure, achieves the following function:
  • the bridging contact piece 3 is driven so far that it runs from the switching contact piece 2. From this point on, depending on the current to be switched, an arc begins to burn between the arcing contact piece 11 and the switching contact piece 2, which is pulled through the bridging contact piece 3 and commutates on the switching contact piece 1. As soon as an annular channel 20 between the arcing contact piece 11 of the bridging contact piece 3 and the switching contact piece 2 is opened, the arc heats up the quenching gas located in the volume 9 and increases its pressure. During the current zero crossing of the current to be switched, the quenching gas located in the second heating chamber 9 can flow into the arc chamber 13 and extinguish the arc there.

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  • Circuit Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Breakers (AREA)

Abstract

A h.v. power switch has contacts (1, 2) that in the engaged position are bridged by a sliding contact (3). Formed between the hollow contacts is an arcing chamber (13). A heating chamber for extinguishing gas (4) is formed between insulating material (4, 5, 6) and an annular space (8) connects with the arcing region and a second heating space (9). This space receives the bridging contact (3) in the on state. When the switch is operated to open the contacts a piston (15) compresses gas in a chamber (14) and it is forced through to extinguish the arc formed by contact opening.

Description

Die Erfindung bezieht sich auf einen Hochspannungs-Leistungsschalter mit zwei einander koaxial gegenüberstehenden, zur Abfuhr von Löschgas hohl ausgebildeten Schaltkontaktstücken, zwischen denen ein Lichtbogenraum gebildet ist und mit einem diese koaxial umgebenden antreibbaren Überbrückungskontaktstück sowie mit einem das Überbrückungskontakt stück in dessen Einschaltstellung koaxial umgebenden ersten Heizraum für das Löschgas, der im Ausschaltzustand mittels eines ersten, im Einschaltzustand von dem Überbrückungskontaktstück verschlossenen Kanals mit dem Lichtbogenraum verbunden ist.The invention relates to a high-voltage circuit breaker with two mutually coaxially opposed, hollow for the discharge of extinguishing gas switching contact pieces, between which an arc space is formed and with this coaxially drivable bridging contact piece and with the bridging contact piece in its switch-on position coaxially surrounding the first heating chamber for the extinguishing gas, which is connected to the arc chamber in the switched-off state by means of a first channel which is closed by the bridging contact piece in the switched-on state.

Ein solcher Hochspannungs-Leistungsschalter ist beispielsweise aus der DE-OS 41 03 119 bekannt.Such a high-voltage circuit breaker is known for example from DE-OS 41 03 119.

Aus der DE-PS 28 12 945 ist ein Hochspannungs-Leistungsschalter mit mehreren in Axialrichtung hintereinanderliegenden Druckräumen bekannt, der jedoch wegen der Größe und Lage der Druckräume eine große Baulänge erfordert. Das anzutreibende Kontaktstück muß entsprechend lang sein und dadurch ergibt sich eine vergrößerte Masse dieses zu beschleunigenden Bauteils. Dies führt zu einer Vergrößerung der benötigten Antriebsenergie.From DE-PS 28 12 945 a high-voltage circuit breaker with a plurality of pressure chambers lying one behind the other in the axial direction is known, which, however, requires a large overall length because of the size and position of the pressure chambers. The contact piece to be driven must be correspondingly long and this results in an increased mass of this component to be accelerated. This leads to an increase in the drive energy required.

Aus der FR-A-2 520 928 ist ein Schalter mit mehreren teilweise untereinander verbundenen Heizräumen bekannt, die nacheinander mit dem Lichtbogenraum verbunden werden. Die Anordnung dieser Heizräume axial hintereinander erfordert jedoch eine große Baulänge des Schalters und einen langen Schaltweg des antreibbaren Kontaktstückes.From FR-A-2 520 928 a switch is known with a plurality of heating rooms, some of which are connected to one another and which are successively connected to the arc room. The arrangement of these boiler rooms axially one behind the other requires a large length of the switch and a long switching distance of the drivable contact piece.

Der Erfindung liegt die Aufgabe zugrunde, bei einem Hochspannungs-Leistungsschalter der eingangs genannten Art das Löschverhalten weiter zu verbessern und dabei die notwendigen Antriebsenergien möglichst gering zu halten.The invention has for its object that in a high-voltage circuit breaker of the type mentioned To further improve extinguishing behavior while keeping the necessary drive energies as low as possible.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein zweiter Heizraum vorgesehen ist, der im Ausschaltzustand mittels eines zweiten, im Einschaltzustand von dem Überbrückungskontaktstück verschlossenen Kanals mit dem Lichtbogenraum verbunden ist, daß der zweite und der erste Kanal beim Ausschaltvorgang von dem Überbrückungskontaktstück zu unterschiedlichen Zeitpunkten freigegeben werden, daß das Überbrückungskontaktstück im Einschaltzustand im wesentlichen innerhalb des zweiten Heizraums angeordnet ist und daß der erste Heizraum den zweiten Heizraum umgibt und im wesentlichen von aus Isolierstoff bestehenden Elementen begrenzt ist.The object is achieved in that a second heating chamber is provided which is connected to the arc chamber in the switched-off state by means of a second channel closed by the bridging contact piece in the switched-on state, in that the second and the first channel are released by the bridging contact piece at different times during the switching-off process be that the bridging contact piece is arranged in the switched-on state substantially within the second heating space and that the first heating space surrounds the second heating space and is essentially limited by elements made of insulating material.

Durch das Vorhandensein zweier verschiedener Heizräume, die nacheinander im Laufe des Ausschaltsvorganges mit dem Lichtbogenraum verbunden werden, kann das Beblasungsverhalten genauer als bisher kontrolliert und eingestellt werden. Es können beispielsweise beim Ausschalten zwei nacheinander erfolgende Druckstöße aus dem ersten und zweiten Heizraum in Richtung des Lichtbogenraums verwirklicht werden. Diese Druckstöße können je nach der Größe des jeweiligen Heizraums und seiner Entfernung vom Lichtbogenraum auch unterschiedlich intensiv gestaltet werden. Die Kanäle können auch derart nacheinander freigegeben werden, daß der Gasstrom aus einem Heizraum durch den später nachströmenden Gasstrom aus dem anderen Heizraum verlängert wird.Due to the presence of two different boiler rooms, which are connected to the arc chamber one after the other during the switch-off process, the blowing behavior can be controlled and adjusted more precisely than before. For example, when switching off, two successive pressure surges from the first and second heating chamber in the direction of the arc chamber can be realized. These pressure surges can also be designed with different intensities depending on the size of the respective boiler room and its distance from the arc room. The channels can also be released one after the other in such a way that the gas flow from one boiler room is extended by the gas stream flowing later from the other boiler room.

Die Kanäle können beispielsweise besonders einfach durch den Lichtbogenraum und zeitweilig das Überbrückungskontaktstück koaxial umgebende Ringkanäle gebildet sein.The channels can, for example, be formed particularly simply by the arc space and temporarily ring channels coaxially surrounding the bridging contact piece.

Insbesondere dann, wenn die Kanäle, die die Heizräume mit dem Lichtbogenraum verbinden, als Ringkanäle ausgebildet sind, ergibt sich für den ersten und den zweiten Heizraum beim Einströmen des heißen Löschgases in den Lichtbogenraum zum Teil derselbe radial nach innen verlaufende Gasströmungsweg, so daß sich die Gasströmung aus dem ersten Heizraum und die aus dem zweiten Heizraum besonders günstig zu einem Gesamtlöschgasstrom zusammensetzen.In particular, if the channels that connect the heating rooms to the arc chamber are designed as ring channels, the first and the second heating chamber partially arise when the hot quenching gas flows into the arc room the same radially inward gas flow path, so that the gas flow from the first heating chamber and that from the second heating chamber are combined particularly advantageously to form a total extinguishing gas flow.

Da das Überbrückungskontaktstück im Einschaltzustand beide Schaltkontaktstücke koaxial umgibt, muß um diese herum ein freier Raum angeordnet sein, der dem Überbrückungskontaktstück Platz bietet. Beim Ausschalten wird das Überbrückungskontaktstück zurückgezogen und gibt wenigstens einen Teil dieses Raumes frei, der dann als zweiter Heizraum genutzt werden kann. Sobald das Überbrückungskontaktstück von einem der Schaltkontaktstücke abgelaufen ist, wird ein Lichtbogen gezogen und gleichzeitig wird ein Kanal zwischen dem Lichtbogenraum und dem von dem Überbrückungskontaktstück freigegebenen Raum freigegeben. Dieser zweite Lichtbogenraum ist naturgemäß dem Lichtbogen sehr nahe, so daß es sich als vorteilhaft erweisen kann, daß zuerst der zweite Kanal und danach der erste Kanal von dem Überbrückungskontaktstück freigegeben werden.Since the bridging contact piece coaxially surrounds both switching contact pieces in the switched-on state, a free space must be arranged around them which offers space for the bridging contact piece. When switched off, the bridging contact piece is withdrawn and frees at least part of this space, which can then be used as a second boiler room. As soon as the bridging contact piece has expired from one of the switching contact pieces, an arc is drawn and at the same time a channel is released between the arcing space and the space released by the bridging contact piece. This second arcing space is naturally very close to the arcing, so that it can prove advantageous that first the second channel and then the first channel are released by the bridging contact piece.

Vorteilhafterweise kann auch wenigstens eines der Schaltkontaktstücke an seinem dem anderen Schaltkontaktstück zugewandten Ende einen Aufsatz aus Isolierstoff tragen.Advantageously, at least one of the switch contact pieces can also carry an attachment made of insulating material at its end facing the other switch contact piece.

Hierdurch wird während des Brennens des Lichtbogens zwischen den Schaltkontaktstücken oder allgemein im Lichtbogenraum durch die Hitze des Lichtbogens und elektromagnetische Strahlung aus dem Isolierstoff zusätzliches Löschgas freigesetzt, was zu einem verbesserten Löschverhalten beiträgt.As a result, additional quenching gas is released during the burning of the arc between the switch contact pieces or generally in the arc space by the heat of the arc and electromagnetic radiation from the insulating material, which contributes to improved quenching behavior.

Die Erfindung kann außerdem vorteilhaft dadurch ausgestaltet sein, daß der erste Heizraum über einen Kanal mit einem Kompressionsraum verbunden ist, in dem das Löschgas mechanisch komprimiert wird.The invention can also be advantageously configured in that the first heating chamber is connected via a channel to a compression chamber in which the extinguishing gas is mechanically compressed.

Hierdurch kann in an sich bekannter Weise durch eine mechanische Kompressionsvorrichtung Löschgas auch in dem Fall bereitgestellt werden, in dem lediglich ein stromschwacher Lichtbogen vorhanden ist, so daß die Aufheizung des Löschgases nicht für das Zustandekommen einer ausreichenden Löschgasströmung ausreicht. Aber auch bei stromstärkeren Lichtbogen kann das mechanisch komprimierte Löschgas das durch Lichtbogenheizung bereitgestellte unter hohem Druck stehende Löschgas bei der Löschung des Lichtbogens unterstützen.As a result, extinguishing gas can be provided in a manner known per se by a mechanical compression device even in the case in which only a low-current arc is present, so that the heating of the extinguishing gas is not sufficient for a sufficient extinguishing gas flow to occur. But even in the case of more powerful arcs, the mechanically compressed quenching gas can assist the quenching gas provided by high-pressure arc heating to extinguish the arc.

Im folgenden wird die Erfindung anhand eines Ausführungsbeispiels in einer Zeichnung gezeigt und anschließend beschrieben.In the following, the invention is shown on the basis of an exemplary embodiment in a drawing and then described.

Dabei zeigt die Figur einen Teil einer Unterbrechereinheit eines Hochspannungs-Leistungsschalters schematisch in einem Längsschnitt.The figure shows a part of an interrupter unit of a high-voltage circuit breaker schematically in a longitudinal section.

Die Figur zeigt einen Teil eines Hochspannungs-Leistungsschalters mit zwei einander gegenüberstehenden, hohl ausgebildeten Schaltkontaktstücken 1, 2, die im Einschaltzustand durch das Überbrückungskontaktstück 3 überbrückt sind. Im unteren Halbschnitt zeigt die Figur diesen Einschaltzustand, im oberen Halbschnitt den Ausschaltzustand. Zwischen den Schaltkontaktstücken 1, 2 ist ein Lichtbogenraum 13 gebildet, in dem beim Ausschalten des Schalters zeitweise ein Lichtbogen zwischen den Schaltkontaktstücken 1, 2 brennt. Ein erster Heizraum 4 umgibt koaxial die Schaltkontaktstücke 1, 2 und den Lichtbogenraum 3. Er ist von einem ersten Isolierstoffelement 5, einem zweiten Isolierstoffelement 6 und einem Zylindermantel 7 begrenzt und weist einen Ringkanal 8 zum Austritt des Löschgases in den Lichtbogenraum 3 auf.The figure shows a part of a high-voltage circuit breaker with two mutually opposite, hollow switching contact pieces 1, 2 which are bridged by the bridging contact piece 3 in the switched-on state. The figure shows this switch-on state in the lower half-section and the switch-off state in the upper half-section. An arc space 13 is formed between the switch contact pieces 1, 2, in which an arc burns temporarily between the switch contact pieces 1, 2 when the switch is switched off. A first heating space 4 coaxially surrounds the switching contact pieces 1, 2 and the arc space 3. It is delimited by a first insulating element 5, a second insulating element 6 and a cylinder jacket 7 and has an annular channel 8 for the discharge of the quenching gas into the arc space 3.

Zwischen dem Isolierstoffelement 6, das das Schaltkontaktstück 2 umgibt und diesem Schaltkontaktstück 2 ist ein Zwischenraum 9 gebildet, den das Überbrückungskontaktstück 3 im Einschaltzustand im wesentlichen ausfüllt. Während des Ausschaltvorganges gibt das Überbrückungskontaktstück 3 diesen Raum 9 frei. Nachdem die Kontaktfinger 10 des Überbrückungskontaktstücks 3 von dem Schaltkontaktstück 2 abgelaufen sind und der Lichtbogenkontakt 11 des Überbrückungskontakt stücks 3 einen Abstand zu dem Schaltkontaktstück 2 aufweist, wird dort ein Lichtbogen gezogen und gleichzeitig ein Ringkanal 20 freigegeben, der den Raum 9 mit dem Lichtbogenraum 3 verbindet. Der im Einschaltzustand von dem Überbrückungskontaktstück 3 ausgefüllte Raum 9 steht somit als zweiter Heizraum für das vom Lichtbogen aufgeheizte Löschgas zur Verfügung.Between the insulating element 6, which surrounds the switching contact piece 2 and this switching contact piece 2, an intermediate space 9 is formed, which the bridging contact piece 3 essentially fills in the switched-on state. During the Switch-off process, the bridging contact piece 3 releases this space 9. After the contact fingers 10 of the bridging contact piece 3 have expired from the switching contact piece 2 and the arcing contact 11 of the bridging contact piece 3 is at a distance from the switching contact piece 2, an arc is drawn there and at the same time an annular channel 20 is released, which connects the space 9 with the arcing space 3 . The space 9 filled by the bridging contact piece 3 when it is switched on is thus available as a second heating space for the quenching gas heated by the arc.

Das zweite Isolierstoffelement 6 ist so geformt, daß der Ringkanal 8 zwischen dem ersten Heizraum und dem Lichtbogenraum 3 von dem Überbrückungskontaktstück 3 erst freigegeben wird, nachdem das Überbrückungskontaktstück 3 von dem Schaltkontaktstück 2 abgelaufen ist, d. h. nachdem der Verbindungskanal 20 zwischen dem zweiten Heizraum 9 und dem Lichtbogenraum 3 durch das Überbrückungskontaktstück 3 wenigstens teilweise freigegeben worden ist.The second insulating material element 6 is shaped so that the ring channel 8 between the first heating space and the arc space 3 is only released by the bridging contact piece 3 after the bridging contact piece 3 has expired from the switching contact piece 2, i. H. after the connecting channel 20 between the second heating chamber 9 and the arc chamber 3 has been at least partially released by the bridging contact piece 3.

Das zweite Isolierstoffelement 6 weist zu diesem Zweck einen umlaufenden Steg 12 auf, dessen Höhe so gestaltet ist, daß der Ringkanal 8 im geeigneten Zeitpunkt von dem Überbrückungskontaktstück 3 freigegeben wird.For this purpose, the second insulating element 6 has a circumferential web 12, the height of which is designed such that the ring channel 8 is released by the bridging contact piece 3 at a suitable time.

Es ist außerdem ein Kompressionsraum 14 vorgesehen, in dem Löschgas mechanisch komprimiert wird. Zu diesem Zweck ist ein beweglicher Kompressionskolben 15 mechanisch über eine Antriebsstange 16 mit dem Schalterantrieb verbunden, der auch das Überbrückungskontaktstück 3 antreibt. Der Kompressionsraum 14 ist auf der Antriebsseite des Schalters angeordnet, so daß sich der Kompressionsraum 14 auf der dem Antrieb zugewandten Seite des beweglichen Kompressionskolbens 15 befindet. Von dort aus wird das komprimierte Löschgas über einen axial verlaufenden Kanal 17 zum ersten Heizraum 4 geleitet, in den es über ein Rückschlagventil 18 eingeleitet wird.A compression space 14 is also provided, in which the extinguishing gas is mechanically compressed. For this purpose, a movable compression piston 15 is mechanically connected to the switch drive via a drive rod 16, which also drives the bridging contact piece 3. The compression space 14 is arranged on the drive side of the switch, so that the compression space 14 is located on the side of the movable compression piston 15 facing the drive. From there, the compressed extinguishing gas is passed via an axially extending channel 17 to the first heating chamber 4, into which it is introduced via a check valve 18.

Hierdurch ist gewährleistet, daß in dem Fall, daß ein starker Lichtbogen im Lichtbogenraum 13 einen hohen Löschgasdruck im Heizraum 4 bewirkt, kein Löschgas aus dem Heizraum 4 in den Kompressionsraum 14 gedrückt wird. Hierdurch wird eine übermäßige Belastung des Schalterantriebs bei großen zu schaltenden Stromstärken vermieden. Erst zu dem Zeitpunkt, zu dem das heiße Löschgas aus dem Heizraum 4 in den Lichtbogenraum 13 ausgeströmt und der Gasdruck im Heizraum entsprechend abgesunken ist, kann mechanisch komprimiertes Löschgas aus dem Kompressionsraum 14 in den Heizraum 4 nachströmen.This ensures that in the event that a strong arc in the arc space 13 causes a high extinguishing gas pressure in the heating space 4, no extinguishing gas is pressed from the heating space 4 into the compression space 14. As a result, an excessive load on the switch drive is avoided at large currents to be switched. Only at the point in time at which the hot extinguishing gas flows out of the heating space 4 into the arc space 13 and the gas pressure in the heating space has dropped accordingly can mechanically compressed extinguishing gas flow from the compression space 14 into the heating space 4.

Durch die Schalterkonstruktion, wie sie in der Figur gezeigt ist, wird folgende Funktion erreicht:The switch construction, as shown in the figure, achieves the following function:

Zunächst wird das Überbrückungskontaktstück 3 soweit angetrieben, daß es von dem Schaltkontaktstück 2 abläuft. Von diesem Zeitpunkt an beginnt, abhängig von der zu schaltenden Stromstärke ein Lichtbogen zwischen dem Lichtbogenkontaktstück 11 und dem Schaltkontaktstück 2 zu brennen, der durch das Überbrückungskontaktstück 3 gezogen wird und auf das Schaltkontaktstück 1 kommutiert. Sobald ein Ringkanal 20 zwischen dem Lichtbogenkontaktstück 11 des Überbrückungskontaktstücks 3 und dem Schaltkontaktstück 2 geöffnet ist, heizt der Lichtbogen das in dem Volumen 9 befindliche Löschgas auf und erhöht dessen Druck. Während des Stromnulldurchgangs des zu schaltenden Stroms kann das in dem zweiten Heizraum 9 befindliche Löschgas in den Lichtbogenraum 13 strömen und dort den Lichtbogen löschen. Hierbei wird es, sobald der Ringkanal 8 durch das Überbrückungskontaktstück 3 freigegeben ist, von dem Löschgas aus dem ersten Heizraum 4 unterstützt, sobald dieses ebenfalls durch die Wirkung des Lichtbogens aufgeheizt ist. Durch die Position des Ringkanals 8 kann somit bestimmt werden, in welcher zeitlichen Abfolge der Löschgasstrom aus dem zweiten Heizraum 9 und der Löschgasstrom aus dem ersten Heizraum 4 auf den Lichtbogen einwirken. Hierdurch kann eine effektive und zuverlässige Löschung des Lichtbogens in dem Lichtbogenraum 13 erreicht werden. Außerdem ist das Schaltkontaktstück 1 mit einem Aufsatz 19 aus einem Isolierstoff, beispielsweise Polytetrafluoräthylen versehen, wodurch der Lichtbogen dort weiteres Löschgas freisetzt, das ebenfalls der Verbesserung der Löschwirkung dient.First, the bridging contact piece 3 is driven so far that it runs from the switching contact piece 2. From this point on, depending on the current to be switched, an arc begins to burn between the arcing contact piece 11 and the switching contact piece 2, which is pulled through the bridging contact piece 3 and commutates on the switching contact piece 1. As soon as an annular channel 20 between the arcing contact piece 11 of the bridging contact piece 3 and the switching contact piece 2 is opened, the arc heats up the quenching gas located in the volume 9 and increases its pressure. During the current zero crossing of the current to be switched, the quenching gas located in the second heating chamber 9 can flow into the arc chamber 13 and extinguish the arc there. Here, as soon as the ring channel 8 is released by the bridging contact piece 3, it is supported by the extinguishing gas from the first heating chamber 4 as soon as it is also heated by the action of the arc. The position of the ring channel 8 can thus determine the time sequence in which the quenching gas flow from the second heating chamber 9 and the quenching gas flow from the first heating chamber 4 act on the arc. In this way, an effective and reliable quenching of the arc in the arc space 13 can be achieved. Besides, that is Switch contact 1 with an attachment 19 made of an insulating material, for example polytetrafluoroethylene, whereby the arc releases further quenching gas there, which also serves to improve the quenching effect.

Claims (4)

  1. A high voltage power switch with two switching contacts (1, 2) arranged coaxially opposite one another and of hollow formation for the discharge of extinguishing gas, between which switching contacts an arc chamber (13) is formed, and with a driveable bridging contact (3) which coaxially surrounds said switching contacts, and with a first heating chamber (4) for the extinguishing gas which in the closed state coaxially surrounds the bridging contact (3) and in the open state is connected to the arc chamber (13) by means of a first channel (8) which in the closed state is shut by the bridging contact (3), characterised in that a second heating chamber (9) is provided which in the open state is connected to the arc chamber (3) by means of a second channel (20) which in the closed state is shut by the bridging contact (3), that during the opening process the second channel (20) and the first channel (8) are released by the bridging contact (3) at different times, that in the closed state the bridging contact (3) is substantially arranged inside the second heating chamber (9), and that the first heating chamber (4) surrounds the second heating chamber (9) and is substantially delimited by elements (5, 6, 7) composed of insulating material.
  2. A high voltage power switch according to Claim 1, characterised in that firstly the second channel (20) and then the first channel (8) are released by the bridging contact (3).
  3. A high voltage power switch according to Claim 1 or one of the following claims, characterised in that at least one of the switching contacts (1, 2) bears a cap (19) composed of insulating material at its end facing towards the other switching contact.
  4. A high voltage power switch according to Claim 1 or one of the following claims, characterised in that the first heating chamber (4) is connected via a channel (17) to a compression chamber (14) in which the extinguishing gas is mechanically compressed.
EP94250299A 1994-01-21 1994-12-21 High-voltage power circuit breaker with a heating chamber Expired - Lifetime EP0664553B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4402123A DE4402123C2 (en) 1994-01-21 1994-01-21 High voltage circuit breaker with a boiler room
DE4402123 1994-01-21

Publications (2)

Publication Number Publication Date
EP0664553A1 EP0664553A1 (en) 1995-07-26
EP0664553B1 true EP0664553B1 (en) 1997-05-14

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ID=6508651

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94250299A Expired - Lifetime EP0664553B1 (en) 1994-01-21 1994-12-21 High-voltage power circuit breaker with a heating chamber

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EP (1) EP0664553B1 (en)
AT (1) ATE153174T1 (en)
DE (2) DE4402123C2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29520809U1 (en) * 1995-12-19 1996-02-15 Siemens AG, 80333 München High voltage circuit breaker with a gas storage space
DE19745550A1 (en) * 1997-10-10 1999-04-15 Siemens Ag Gas-blast circuit-breaker arrangement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1549863A (en) * 1976-04-27 1979-08-08 Reyrolle Parsons Ltd High voltage circuit interrupters
CH632609A5 (en) * 1977-03-24 1982-10-15 Mitsubishi Electric Corp Circuit breaker with lichtbogenloeschendem gas.
FR2520928A1 (en) * 1982-02-04 1983-08-05 Alsthom Atlantique PNEUMATIC SELF-BLOWING CIRCUIT BREAKER
DE4103119A1 (en) * 1991-01-31 1992-08-06 Siemens Ag EXHAUST GAS SWITCH

Also Published As

Publication number Publication date
DE4402123C2 (en) 1996-02-22
EP0664553A1 (en) 1995-07-26
DE4402123A1 (en) 1995-07-27
DE59402748D1 (en) 1997-06-19
ATE153174T1 (en) 1997-05-15

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