EP0744759B1 - H.T. circuit breaker with a fixed heating chamber - Google Patents

H.T. circuit breaker with a fixed heating chamber Download PDF

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Publication number
EP0744759B1
EP0744759B1 EP96250107A EP96250107A EP0744759B1 EP 0744759 B1 EP0744759 B1 EP 0744759B1 EP 96250107 A EP96250107 A EP 96250107A EP 96250107 A EP96250107 A EP 96250107A EP 0744759 B1 EP0744759 B1 EP 0744759B1
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EP
European Patent Office
Prior art keywords
compression
contacts
continuous
compression cylinder
current contact
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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.)
Expired - Lifetime
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EP96250107A
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German (de)
French (fr)
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EP0744759A1 (en
Inventor
Volker Lehmann
Friedrich Löbner
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Siemens AG
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Siemens AG
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Publication of EP0744759A1 publication Critical patent/EP0744759A1/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
    • H01H33/70—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
    • 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
    • H01H2033/908—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 using valves for regulating communication between, e.g. arc space, hot volume, compression volume, surrounding volume
    • 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
    • H01H33/24—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
    • H01H33/245—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring using movable field electrodes

Definitions

  • the invention relates to a high-voltage circuit breaker with a pair of opposite, in the off state arcing contact pieces delimiting a separation distance and a pair of coaxial with the arcing contacts arranged continuous current contact pieces, of which in each case at least one of the contact pieces from a drive side is drivable, as well as with one in the course of Switchable movement, a compression piston and one driven compression cylinder having compression device and one on the drive side of the compression piston arranged during the switching movement fixed heating volume.
  • Such a high voltage circuit breaker is already known from DE-OS 41 03 119.
  • the known switch are two arcing contacts coaxial with continuous current contacts surrounded and a fixed heating volume is provided, in which the heated by an arc during the switching process Extinguishing gas stored and for a subsequent blowing of the Arc can be provided.
  • a mechanical compression device for the extinguishing gas provided that on the one hand at low currents when the arc is not sufficient to heat the extinguishing gas, provides sufficiently high extinguishing gas pressure and on the other hand at medium-sized currents, the blowing of the Arc supports.
  • a major advantage of the known circuit breaker described before other known designs is that the heating volume and the components that limit it during the switching movement need not be accelerated.
  • the compression cylinder the drivable continuous current contact carries on its outside that the compression piston so on the side of the circuit breaker facing the drive is arranged that the compression cylinder with the continuous current contact can be moved out of the separation distance and that the continuous current contacts from the arcing contacts gas-tight by a coaxially surrounding insulating body are separated.
  • An advantageous embodiment of the invention provides that the compression piston is pierced by a check valve is only in the direction from the compression space to the Allows heating gas to flow through.
  • the extinguishing gas compressed in the compression space can thus through the check valve into the boiler room while an overflow of pressurized extinguishing gas from the Boiler room in the compression room is not possible.
  • an overflow of pressurized extinguishing gas from the Boiler room in the compression room is not possible.
  • the extinguishing gas pressure in the compression chamber increases sharply so that it obstructs the opening movement or slowed down.
  • a further advantageous embodiment of the invention provides before that the continuous current contact carried by the compression cylinder a field electrode for equalization when switched off of the electrical field in the area of the isolating section forms.
  • the fixed counter contact to the moving continuous current contact can also be designed as a field electrode. It is also conceivable on the opposite side of the drive of the switch A well-known, retractable side Arrange field electrode in the axial direction of the Switch is loaded with a spring force when switching on the switch can be pushed back by the compression cylinder and when switching off the compression cylinder up to a stop and stand there as a field electrode remains.
  • FIG. 1 shows schematically part of an interrupter unit a circuit breaker without the housing, and in the upper half in the off state and in the lower half Half in the on state.
  • each other two arcing contacts 1, 2 in the off state opposite the upper half of the figure coaxially.
  • d. H. in the lower part of the figure is the drivable Arc contact 1 moved into the fixed counter contact 2.
  • the drivable is also in the switched-on state Continuous current contact 3 in contact with the fixed one Continuous current contact 4 brought.
  • the drivable continuous current contact 3 consists of an electrically conductive, metallic Coating on the outside of the compression cylinder 5, the the drivable part of a mechanical compression device forms for the extinguishing gas.
  • This boiler room 11 is fixed and moves not when the switch is actuated. In the boiler room, the Heat of the arc provided expanded quenching gas, to extinguish the arc at zero current the gas channel 9 flows back to the arc chamber 8.
  • the compression cylinder 5 is via a linkage 13 connected to the drivable arcing contact 1 and is driven with this.
  • the compression cylinder can also be made entirely of metal, for example aluminum consist.
  • the heating room 11 is so far away from the arc room 8 to the drive side moved that the compression cylinder 5th during the switch-off movement up to the fixed compression piston 6 be moved back and forth from the separation distance can.
  • the electrically conductive coating 3 of the compression cylinder 5 is up to the end face of the compression cylinder 5 pulled and forms a field electrode in the off state to equalize the electric field between the Arc contacts or the continuous current contacts.
  • the insulating material nozzle 10, which has the gas flow channel 9, is fixed in the area of the separating section and separates the area of the arc room 8 from the outside the interrupter unit, which in turn, for example, from included a porcelain housing, not shown becomes. There is only hot extinguishing gas through the gas flow channel 9 passed into the heating volume 11.

Description

Die Erfindung bezieht sich auf einen Hochspannungs-Leistungsschalter mit einem Paar einander gegenüberstehender, im Ausschaltzustand eine Trennstrecke begrenzender Lichtbogenkontaktstücke sowie einem Paar von koaxial zu den Lichtbogenkontaktstücken angeordneten Dauerstromkontaktstücken, von denen jeweils mindestens eines der Kontaktstücke von einer Antriebsseite her antreibbar ist, sowie mit einer im Zuge der Schaltbewegung betätigbaren, einen Kompressionskolben und einen antreibbaren Kompressionszylinder aufweisenden Kompressionsvorrichtung und einem auf der Antriebsseite des Kompressionskolbens angeordneten, während der Schaltbewegung feststehenden Heizvolumen.The invention relates to a high-voltage circuit breaker with a pair of opposite, in the off state arcing contact pieces delimiting a separation distance and a pair of coaxial with the arcing contacts arranged continuous current contact pieces, of which in each case at least one of the contact pieces from a drive side is drivable, as well as with one in the course of Switchable movement, a compression piston and one driven compression cylinder having compression device and one on the drive side of the compression piston arranged during the switching movement fixed heating volume.

Ein derartiger Hochspannungs-Leistungsschalter ist bereits aus der DE-OS 41 03 119 bekannt. Bei dem bekannten Schalter sind zwei Lichtbogenkontakte koaxial von Dauerstromkontakten umgeben und es ist ein feststehendes Heizvolumen vorgesehen, in dem das durch einen Lichtbogen beim Schaltvorgang erhitzte Löschgas gespeichert und für eine nachfolgende Beblasung des Lichtbogens bereitgestellt werden kann. Zusätzlich ist dort eine mechanische Kompressionsvorrichtung für das Löschgas vorgesehen, die einerseits bei geringen Stromstärken, wenn die Beheizung des Löschgases durch den Lichtbogen nicht ausreicht, genügend hohen Löschgasdruck bereitstellt und andererseits bei mittelgroßen Stromstärken die Beblasung des Lichtbogens unterstützt.Such a high voltage circuit breaker is already known from DE-OS 41 03 119. In the known switch are two arcing contacts coaxial with continuous current contacts surrounded and a fixed heating volume is provided, in which the heated by an arc during the switching process Extinguishing gas stored and for a subsequent blowing of the Arc can be provided. In addition there is a mechanical compression device for the extinguishing gas provided that on the one hand at low currents when the arc is not sufficient to heat the extinguishing gas, provides sufficiently high extinguishing gas pressure and on the other hand at medium-sized currents, the blowing of the Arc supports.

Ein wesentlicher Vorteil des beschriebenen bekannten Leistungsschalters vor anderen bekannten Bauformen ist der, daß das Heizvolumen und die dieses begrenzenden Bauteile während der Schaltbewegung nicht beschleunigt zu werden brauchen. A major advantage of the known circuit breaker described before other known designs is that the heating volume and the components that limit it during the switching movement need not be accelerated.

Hierdurch wird Antriebsenergie und entsprechend der Aufwand für den Schalterantrieb verringert.This will drive energy and accordingly the effort reduced for the switch drive.

Dieser Vorteil soll bei der der Erfindung zugrundeliegenden Konstruktion beibehalten werden, wobei die zu beschleunigenden Bauteile noch weiter reduziert werden sollen.This advantage is said to be the basis of the invention Construction to be maintained, with the accelerated Components should be reduced even further.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß der Kompressionszylinder den antreibbaren Dauerstromkontakt an seiner Außenseite trägt, daß der Kompressionskolben derart auf der dem Antrieb zugewandten Seite des Leistungsschalters angeordnet ist, daß der Kompressionszylinder mit dem Dauerstromkontakt aus der Trennstrecke herausbewegt werden kann und daß die Dauerstromkontakte von den Lichtbogenkontakten durch einen diese koaxial umgebenden Isolierstoffkörper gasdicht abgetrennt sind.This object is achieved according to the invention in that the compression cylinder the drivable continuous current contact carries on its outside that the compression piston so on the side of the circuit breaker facing the drive is arranged that the compression cylinder with the continuous current contact can be moved out of the separation distance and that the continuous current contacts from the arcing contacts gas-tight by a coaxially surrounding insulating body are separated.

Dadurch, daß der Kompressionszylinder mit dem Dauerstromkontakt konstruktiv verbunden ist, wird der Schalter insgesamt baulich vereinfacht und die zu beschleunigenden Massen werden verringert. Hierdurch bedingt ist es notwendig, den Kompressionszylinder, der nun elektrisch leitende Elemente trägt, im Ausschaltzustand aus der Trennstrecke zurückzuziehen.The fact that the compression cylinder with the continuous current contact is constructively connected, the switch is total structurally simplified and the masses to be accelerated decreased. Because of this, it is necessary to who now carries electrically conductive elements, in Withdraw the switch-off status from the isolating section.

Dies wird durch eine Verlegung des Heizraumes zur Antriebsseite des Schalters hin ermöglicht. Das Heizvolumen speichert das erhitzte Löschgas und stellt es für eine nachfolgende Beblasung des Lichtbogens bereit. Durch den Isolierstoffkörper wird eine Kontaminierung der Dauerstromkontakte mit heißem Löschgas verhindert.This is done by moving the boiler room to the drive side of the switch. The heating volume is saved the heated extinguishing gas and provides it for subsequent blowing of the arc ready. Through the insulating body contamination of the continuous current contacts with hot Extinguishing gas prevented.

Eine vorteilhafte Ausgestaltung der Erfindung sieht vor, daß der Kompressionskolben von einem Rückschlagventil durchbrochen ist, das nur in der Richtung vom Kompressionsraum zum Heizvolumen Gas durchströmen läßt. An advantageous embodiment of the invention provides that the compression piston is pierced by a check valve is only in the direction from the compression space to the Allows heating gas to flow through.

Das in dem Kompressionsraum komprimierte Löschgas kann somit durch das Rückschlagventil in den Heizraum gelangen, während ein Überströmen von unter Druck stehendem Löschgas aus dem Heizraum in den Kompressionsraum nicht möglich ist. Hierdurch wird verhindert, daß der Löschgasdruck im Kompressionsraum so stark ansteigt, daß er die Ausschaltbewegung behindert bzw. verlangsamt.The extinguishing gas compressed in the compression space can thus through the check valve into the boiler room while an overflow of pressurized extinguishing gas from the Boiler room in the compression room is not possible. Hereby prevents the extinguishing gas pressure in the compression chamber increases sharply so that it obstructs the opening movement or slowed down.

Eine weitere vorteilhafte Ausgestaltung der Erfindung sieht vor, daß der von dem Kompressionszylinder getragene Dauerstromkontakt im Ausschaltzustand eine Feldelektrode zur Vergleichmäßigung des elektrischen Feldes im Bereich der Trennstrecke bildet.A further advantageous embodiment of the invention provides before that the continuous current contact carried by the compression cylinder a field electrode for equalization when switched off of the electrical field in the area of the isolating section forms.

Da der Kompressionszylinder ohnehin den Dauerstromkontakt trägt, bietet es sich an, diesen in Form einer Feldelektrode auszubilden oder mit einer Feldelektrode leitend zu verbinden. Hierdurch ist im zurückgezogenen Zustand des Kompressionszylinders, d. h. im Ausschaltzustand des Leistungsschalters eine Feld-Vergleichmäßigung im Bereich zwischen den Kontakten gewährleistet.Since the compression cylinder anyway the continuous current contact it lends itself to this in the form of a field electrode to train or to connect with a field electrode. As a result, in the retracted state of the compression cylinder, d. H. in the open state of the circuit breaker a field equalization in the area between the contacts guaranteed.

Der feststehende Gegenkontakt zu dem beweglichen Dauerstromkontakt kann ebenfalls als Feldelektrode ausgebildet sein. Es ist auch denkbar, auf der der Antriebsseite des Schalters gegenüberliegenden Seite eine an sich bekannte, zurückschiebbare Feldelektrode anzuordnen, die in axialer Richtung des Schalters mit einer Federkraft beaufschlagt ist, beim Einschalten des Schalters durch den Kompressionszylinder zurückschiebbar ist und beim Ausschalten dem Kompressionszylinder bis zu einem Anschlag folgt und dort als Feldelektrode stehen bleibt.The fixed counter contact to the moving continuous current contact can also be designed as a field electrode. It is also conceivable on the opposite side of the drive of the switch A well-known, retractable side Arrange field electrode in the axial direction of the Switch is loaded with a spring force when switching on the switch can be pushed back by the compression cylinder and when switching off the compression cylinder up to a stop and stand there as a field electrode remains.

Im folgenden wird die Erfindung anhand eines Ausführungsbeispiels in einer Zeichnung gezeigt und anschließend beschrieben. Dabei zeigt die Figur schematisch einen Teil einer Unterbrechereinheit eines Leistungsschalters ohne das Gehäuse, und zwar in der oberen Hälfte im Ausschaltzustand und in der unteren Hälfte im Einschaltzustand.In the following the invention is based on an embodiment shown in a drawing and then described. The figure shows schematically part of an interrupter unit a circuit breaker without the housing, and in the upper half in the off state and in the lower half Half in the on state.

Bei dem dargestellten Hochspannungs-Leistungsschalter stehen einander zwei Lichtbogenkontakte 1, 2 im Ausschaltzustand in der oberen Hälfte der Figur koaxial gegenüber. Im Einschaltzustand, d. h. im unteren Teil der Figur ist der antreibbare Lichtbogenkontakt 1 in den feststehenden Gegenkontakt 2 eingefahren. Gleichzeitig ist im Einschaltzustand auch der antreibbare Dauerstromkontakt 3 in Kontakt mit dem feststehenden Dauerstromkontakt 4 gebracht. Der antreibbare Dauerstromkontakt 3 besteht aus einem elektrisch leitenden, metallischen Belag auf der Außenseite des Kompressionszylinders 5, der den antreibbaren Teil einer mechanischen Kompressionsvorrichtung für das Löschgas bildet.Stand at the high-voltage circuit breaker shown each other two arcing contacts 1, 2 in the off state opposite the upper half of the figure coaxially. When switched on, d. H. in the lower part of the figure is the drivable Arc contact 1 moved into the fixed counter contact 2. At the same time, the drivable is also in the switched-on state Continuous current contact 3 in contact with the fixed one Continuous current contact 4 brought. The drivable continuous current contact 3 consists of an electrically conductive, metallic Coating on the outside of the compression cylinder 5, the the drivable part of a mechanical compression device forms for the extinguishing gas.

Im Zuge der Ausschaltbewegung wird der antreibbare Kompressionszylinder 5 über einen feststehenden Kompressionskolben 6 gezogen und so wird das zwischen diesen gebildete Kompressionsvolumen 7 komprimiert.In the course of the switch-off movement, the drivable compression cylinder 5 via a fixed compression piston 6 pulled and so is the compression volume formed between them 7 compressed.

Außerdem werden die Lichtbogenkontakte 1, 2 und die Dauerstromkontakte 3, 4 voneinander getrennt, wobei zwischen den Lichtbogenkontakten 1, 2 ein Lichtbogen gezogen wird.In addition, the arcing contacts 1, 2 and the continuous current contacts 3, 4 separated from each other, with between the Arcing contacts 1, 2 an arc is drawn.

Durch den Einfluß dieses Lichtbogens wird das in dem Lichtbogenraum 8 vorhandene Löschgas erhitzt und strömt durch den Gaskanal 9 innerhalb des düsenförmigen Isolierstoffkörpers 10 in einen Heizraum 11.Due to the influence of this arc, this becomes in the arc room 8 existing extinguishing gas heats and flows through the Gas channel 9 within the nozzle-shaped insulating material body 10 in a boiler room 11.

Dieser Heizraum 11 ist feststehend angeordnet und bewegt sich bei der Schalterbetätigung nicht. Im Heizraum wird durch die Wärme des Lichtbogens expandiertes Löschgas bereitgestellt, das zur Löschung des Lichbogens im Stromnulldurchgang durch den Gaskanal 9 zum Lichtbogenraum 8 zurückströmt.This boiler room 11 is fixed and moves not when the switch is actuated. In the boiler room, the Heat of the arc provided expanded quenching gas, to extinguish the arc at zero current the gas channel 9 flows back to the arc chamber 8.

Zwischen dem Heizraum 11 und dem Kompressionsraum 7 ist in dem Kompressionskolben 6, der durch einen Teil des Isolierstoffkörpers 10 und einen Teil der den Heizraum 11 begrenzenden Wand gebildet ist, ein Rückschlagventil 12 vorgesehen, das ein Überströmen heißen Löschgases aus dem Heizraum 11 in den Kompressionsraum 7 verhindert. Durch ein solches Überströmen heißen, unter Druck stehenden Löschgases in den Kompressionsraum 7 würde nämlich der Schalterantrieb, der bewirkt, daß einerseits der Kompressionszylinder 5 und andererseits der Lichtbogenkontakt 1 sowie der Dauerstromkontakt 3 in der Figur nach links zur Antriebsseite hin bewegt werden, abgebremst.Between the boiler room 11 and the compression room 7 is in the compression piston 6 through a part of the insulating body 10 and part of the boundary of the boiler room 11 Wall is formed, a check valve 12 is provided, an overflow of hot extinguishing gas from the boiler room 11 in the compression space 7 prevented. Through such an overflow hot, pressurized extinguishing gas into the compression space 7 would namely the switch drive, which causes that on the one hand the compression cylinder 5 and on the other the arcing contact 1 and the continuous current contact 3 in the figure are moved to the left towards the drive side, slowed down.

Andererseits kann aber, wenn bei niedrigen zu schaltenden Stromstärken der Lichtbogen das Löschgas nur ungenügend erhitzt, mechanisch komprimiertes Löschgas aus dem Kompressionsraum 7 über das Rückschlagventil 12 in den Heizraum 11 strömen, um die Beblasung des Lichtbogens zu unterstützen.On the other hand, however, if to be switched at low Current levels of the arcs insufficiently heated the extinguishing gas, mechanically compressed extinguishing gas from the compression space 7 via the check valve 12 into the boiler room 11 flow to assist in blowing the arc.

Da der Dauerstromkontakt 3 lediglich aus einem leitenden Belag, beispielsweise in Form eines Bleches auf dem Kompressionszylinder 5 besteht, und für den Dauerstromkontakt keine einzeln für sich tragfähige Konstruktion notwendig ist, wird die Gesamtheit der bei der Schaltbewegung zu beschleunigenden Massen reduziert. Der Kompressionszylinder 5 ist über ein Gestänge 13 mit dem antreibbaren Lichtbogenkontaktstück 1 verbunden und wird mit diesem angetrieben. Der Kompressionszylinder kann auch vollständig aus Metall, beispielsweise Aluminium bestehen.Since the continuous current contact 3 is only made of a conductive coating, for example in the form of a sheet on the compression cylinder 5 exists, and none for the continuous current contact individually stable construction is necessary the entirety of those to be accelerated during the switching movement Masses reduced. The compression cylinder 5 is via a linkage 13 connected to the drivable arcing contact 1 and is driven with this. The compression cylinder can also be made entirely of metal, for example aluminum consist.

Der Heizraum 11 ist so weit vom Lichtbogenraum 8 weg zur Antriebsseite hin verschoben, daß der Kompressionszylinder 5 bei der Ausschaltbewegung bis zu dem feststehenden Kompressionskolben 6 hin und aus der Trennstrecke wegbewegt werden kann. Der elektrisch leitende Belag 3 des Kompressionszylinders 5 ist bis über die Stirnfläche des Kompressionszylinders 5 gezogen und bildet im Ausschaltzustand eine Feldelektrode zur Vergleichmäßigung des elektrischen Feldes zwischen den Lichtbogenkontakten bzw. den Dauerstromkontakten.The heating room 11 is so far away from the arc room 8 to the drive side moved that the compression cylinder 5th during the switch-off movement up to the fixed compression piston 6 be moved back and forth from the separation distance can. The electrically conductive coating 3 of the compression cylinder 5 is up to the end face of the compression cylinder 5 pulled and forms a field electrode in the off state to equalize the electric field between the Arc contacts or the continuous current contacts.

Die Isolierstoffdüse 10, die den Gasströmungskanal 9 aufweist, ist im Bereich der Trennstrecke feststehend angeordnet und trennt den Bereich des Lichtbogenraumes 8 vom Außenraum der Unterbrechereinheit, die ihrerseits beispielsweise von einem nicht dargestellten Porzellangehäuse eingeschlossen wird. Es wird lediglich heißes Löschgas über den Gasströmungskanal 9 in das Heizvolumen 11 geleitet.The insulating material nozzle 10, which has the gas flow channel 9, is fixed in the area of the separating section and separates the area of the arc room 8 from the outside the interrupter unit, which in turn, for example, from included a porcelain housing, not shown becomes. There is only hot extinguishing gas through the gas flow channel 9 passed into the heating volume 11.

Auf diese Weise wird auch verhindert, daß heißes Löschgas, das einerseits durch Zersetzungsprodukte des Löschgases, andererseits durch verdampfte Materialien verunreinigt ist, an die Innenwand des Schaltergehäuses gelangt, wo es auf Dauer die Isolationsfestigkeit beeinträchtigen kann.This also prevents hot extinguishing gas, on the one hand through decomposition products of the extinguishing gas, on the other is contaminated by evaporated materials the inside wall of the switch case gets where it will go permanently can impair the insulation strength.

Claims (3)

  1. High-voltage circuit-breaker having a pair of opposing arcing contacts (1, 2) which, in the off-state, delimit an isolating distance, and a pair of continuous-current contacts (3, 4), arranged coaxially with respect to the arcing contacts, of which in each case at least one of the contacts can be driven from a drive end, and having a compression device, which can be actuated in the course of the switching operation and has a compression piston (6) and a drivable compression cylinder (5), and a heating volume (11), which is arranged on the side of the compression piston (6) that faces the drive and is stationary during the switching operation, characterised in that the drivable continuous-current contact (3) is carried on the outside of the compression cylinder (5), in that the compression piston (6) is arranged on the drive end of the circuit-breaker, in such a way that the compression cylinder (3(sic)) can be moved out of the isolating distance with the continuous-current contact, and in that the continuous-current contacts are separated in a gastight manner from the arcing contacts by an insulating body which coaxially surrounds said arcing contacts.
  2. High-voltage circuit-breaker according to claim 2, characterised in that the compression piston (6) is penetrated by a non-return valve (12), which lets gas flow through only in the direction from the compression space (7) to the heating volume (11).
  3. High-voltage circuit-breaker according to claim 1 or one of the following, characterised in that the continuous-current contact (3) which is carried by the compression cylinder (5) forms, in the off-state, a field electrode for homogenization of the electrical field in the region of the isolating distance.
EP96250107A 1995-05-24 1996-05-15 H.T. circuit breaker with a fixed heating chamber Expired - Lifetime EP0744759B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29509015U 1995-05-24
DE29509015U DE29509015U1 (en) 1995-05-24 1995-05-24 High-voltage circuit breakers with a fixed heating volume

Publications (2)

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EP0744759A1 EP0744759A1 (en) 1996-11-27
EP0744759B1 true EP0744759B1 (en) 1999-08-11

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EP96250107A Expired - Lifetime EP0744759B1 (en) 1995-05-24 1996-05-15 H.T. circuit breaker with a fixed heating chamber

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29509015U1 (en) * 1995-05-24 1995-08-03 Siemens Ag High-voltage circuit breakers with a fixed heating volume
DE19613569A1 (en) * 1996-04-04 1997-10-09 Asea Brown Boveri Circuit breaker
DE19627098A1 (en) * 1996-07-05 1998-01-08 Asea Brown Boveri Circuit breaker
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DE59602694D1 (en) 1999-09-16
DE29509015U1 (en) 1995-08-03
EP0744759A1 (en) 1996-11-27

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