EP0720775A1 - Gas pressure switch - Google Patents

Gas pressure switch

Info

Publication number
EP0720775A1
EP0720775A1 EP94924695A EP94924695A EP0720775A1 EP 0720775 A1 EP0720775 A1 EP 0720775A1 EP 94924695 A EP94924695 A EP 94924695A EP 94924695 A EP94924695 A EP 94924695A EP 0720775 A1 EP0720775 A1 EP 0720775A1
Authority
EP
European Patent Office
Prior art keywords
switch
arc
gas
switching
nozzle
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.)
Ceased
Application number
EP94924695A
Other languages
German (de)
French (fr)
Inventor
Hold Dienemann
Ulrich Habedank
Klaus-Peter Rolff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0720775A1 publication Critical patent/EP0720775A1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7076—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by the use of special materials
    • 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
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7038—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by a conducting tubular gas flow enhancing nozzle
    • H01H33/7053—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by a conducting tubular gas flow enhancing nozzle having a bridging element around two hollow tubular contacts
    • 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
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7069—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by special dielectric or insulating properties or by special electric or magnetic field control properties

Definitions

  • the invention relates to a compressed gas switch with two fixed, spaced-apart switching elements, which are hollow for the removal of switching gases and have nozzle bodies protruding into the distance on the end face from a substance which releases an extinguishing gas component under the influence of an arc, with one these switching pieces bridging in the switch-on position and releasing in the switch-off position to form a separating distance movable switching piece and with an arc pulling the arc contact system when switching off.
  • the nozzle body of a gas pressure switch made of electrically conductive material, such as e.g. made of graphite.
  • electrically conductive material such as e.g. made of graphite.
  • CF4 gas forms in SFg switches which has good extinguishing properties.
  • DE-PS 27 59 265 it is known for example from DE-PS 27 59 265 to manufacture the nozzle body from an insulating material.
  • an additional quenching gas component is formed under the influence of an arc if the insulating material contains a quenching gas-releasing substance.
  • the insulating material nozzles only have a slight influence on the electrical field in the separating section, which is formed by the electrically conductive versions of the nozzles.
  • the object of the invention is to specify a compressed gas switch of the type mentioned at the outset, in which the advantages of the electrically conductive nozzle body are combined with those of the electrically insulating nozzle body.
  • this object is achieved in that the nozzle bodies consist of a weakly conductive plastic and in that the bridging contact is equipped with an arc electrode which forms the arcing contact system with a second arc electrode on the fixed drain contact.
  • the electrical field in the isolating section is determined by the nozzle body when the switch is open, because they consist of a weakly conductive plastic and act as field electrodes.
  • the weakly conductive plastic of the nozzle body is not suitable for taking over the arc base points of the drawn arc, so that the nozzle body cannot form a commutation aid for the arc which is lengthened as a result of the blowing in the course of the switching-off process. After the arc has entered the interior of the hollow switching elements, it cannot start again on the nozzle contour in the further course of the switch-off action, so that reliable extinguishing is brought about.
  • the weakly conductive plastic has a specific electrical resistance of approximately 2 ⁇ 10 3 ⁇ cm.
  • the nozzle bodies consist of a polytetrafluoroethylene mixed with graphite.
  • the second arc electrode can be of hollow cylindrical design and can encompass the nozzle body of the discharge switching element as far as the area of the front nozzle opening.
  • the second arc electrode can consist of graphite.
  • the figure shows schematically a half-section of a pressure gas switch with the parts necessary for understanding the invention, the switch-on position being drawn above the center line and the extinguishing position reached shortly before the switch-off position of the pressure gas switch is shown below the center line 1.
  • the gas pressure switch which contains SFg as the extinguishing and insulating agent, has two fixed ones.
  • Switch pieces 2, 3 which are arranged at a distance A from one another and are hollow for the removal of switching gases. Both contact pieces 2, 3 have, on the end face, nozzle bodies 4, 5 which protrude into the separating distance formed by the distance A and which, under the action of an arc, contain a substance which releases an extinguishing gas component.
  • the gas pressure switch according to the invention has a movable switching piece 6 bridging the two switching pieces 2, 3 in the switch-on position, with a plurality of spring-loaded contact plates 7 distributed uniformly over the circumference.
  • the movable switching piece 6 outputs switch position the separation distance formed by the distance A free.
  • the gas pressure switch according to the invention is provided with an arcing contact system which draws an arc when it is switched off and which consists of an annular graphite electrode 8 on the discharge switching element 3 on the one hand and a burn-off ring 9 on the bridging switching element 6 on the other hand.
  • the nozzle body 4.5 consist of a weakly conductive plastic, which has a specific electrical resistance of about 2x10 3 ⁇ cm.
  • the nozzle bodies 4, 5 can be produced from a polytetrafluoroethylene mixed with graphite.
  • the second arc electrode 8 of the discharge switching element 3 is of hollow-cylindrical design, wherein it encompasses the nozzle body 5 up to the region of the end-side nozzle opening.
  • the second arc electrode 8, like the first arc electrode 9, can consist of graphite.
  • the bypass switch 6 When the compressed gas switch is routed from the switch-on position shown above the center line 1 into the extinguishing position shown below the center line 1, the bypass switch 6 is moved in the direction of the arrow 10 by a drive (not shown further), which at the same time also has a blowing cylinder 11 moved against a fixed blow piston 12.
  • the sulfur hexafluoride present in the space 13 is compressed until the bypass switching element 6 runs off the sequence switching element 3 and a blowing grille 14 made of plastic material is transferred into the separating section to control the extinguishing gas flow. If the arc electrode 9 from the
  • Arc electrode 8 runs, an arc is drawn, which is driven under the action of the extinguishing gas flow into the interior of the switching pieces 2,3 and in the further course of the switch-off action can not reignite at the exposed positions denoted by 15, the nozzle body 4.5 because the weakly conductive plastic used is not suitable for guiding an arc base.
  • the nozzle bodies 4, 5 delimiting the separating distance at distance A form electrodes, which make the field in the separating distance favorable, so that the compressed gas switch according to the invention can withstand loads with high lightning impulse voltages with certainty.

Landscapes

  • Circuit Breakers (AREA)

Abstract

In a gas pressure switch, two fixed switching components (2, 3) at a distance A apart are hollow to discharge switching gases and are fitted at the front with nozzle bodies (4, 5) projecting inwards by the distance A and made of a material which gives off a quenching gas component under the action an arc. The switching components are bridged in the ON position by a movable switching component which opens the disconnected section in the OFF position. There is also an arc contact system (8, 9) which draws the arc on switch-off. To combine the advantages of electrically conductive nozzle bodies with those of electrically insulating nozzle bodies, the nozzle bodies are made, according to the invention, of a slightly conductive plastic and the bridging component (6) is fitted with an arc electrode which forms the arc contact system (8, 9) with a second arc electrode (8) on the fixed sequence switching component (3).

Description

Beschreibungdescription
DruckgasschalterGas pressure switch
Die Erfindung bezieht sich auf einen Druckgasschalter mit zwei feststehenden, in Abstand voneinander angeordneten Schaltstücken, die zur Abfuhr von Schaltgasen hohl ausgebil¬ det sind und stirnseitig in den Abstand hineinragende Düsen¬ körper aus einem unter Lichtbogeneinwirkung einen Löschgasbe- standteil abgebenden Stoff aufweisen, mit einem diese Schalt¬ stücke in der Einschaltstellung überbrückenden und in der Ausschaltstellung zur Bildung einer Trennstrecke freigebenden beweglichen Schaltstück und mit einem beim Ausschalten den Lichtbogen ziehenden Lichtbogenkontaktsystem.The invention relates to a compressed gas switch with two fixed, spaced-apart switching elements, which are hollow for the removal of switching gases and have nozzle bodies protruding into the distance on the end face from a substance which releases an extinguishing gas component under the influence of an arc, with one these switching pieces bridging in the switch-on position and releasing in the switch-off position to form a separating distance movable switching piece and with an arc pulling the arc contact system when switching off.
Es ist bekannt, die Düsenkörper eines Druckgasschalters aus elektrisch leitendem Material, wie z.B. aus Graphit, herzu¬ stellen. Unter Lichtbogeneinwirkung, insbesondere wenn die Lichtbogenfußpunkte an der Düsenkontur ansetzen, bildet sich in SFg-Schaltern CF4~Gas, das gute Löscheigenschaften auf¬ weist. Ferner ist es beispielsweise aus der DE-PS 27 59 265 bekannt, die Düsenkörper aus einem Isolierstoff herzustellen. Unter Lichtbogeneinwirkung bildet sich ähnlich wie bei sog. Hartgasschaltern ein zusätzlicher Löschgasbestandteil, wenn der Isolierstoff einen Löschgas abgebenden Stoff enthält. Schließlich ist es aus der DE-PS 41 29 572 bekannt, Isolierstoffdüsen in DruckgasSchaltern aus einer Zusammen¬ setzung von einem oder mehreren thermoplastischen Kunststof¬ fen und mit leitfähigen Partikeln im Innern herzustellen, wobei die Partikel aus einem durch Dotierung leitfähig ge¬ machten Polymer bestehen. Damit ergeben sich isolierende Düsen, die treeing-Phänomene im elektrischen Feld nur in verringertem Maß zeigen.It is known that the nozzle body of a gas pressure switch made of electrically conductive material, such as e.g. made of graphite. Under the influence of an arc, in particular if the arc base points attach to the nozzle contour, CF4 gas forms in SFg switches which has good extinguishing properties. Furthermore, it is known for example from DE-PS 27 59 265 to manufacture the nozzle body from an insulating material. As with so-called hard gas switches, an additional quenching gas component is formed under the influence of an arc if the insulating material contains a quenching gas-releasing substance. Finally, it is known from DE-PS 41 29 572 to manufacture insulating material nozzles in compressed gas switches from a composition of one or more thermoplastic plastics and with conductive particles inside, the particles consisting of a polymer made conductive by doping . This results in insulating nozzles that show treeing phenomena in the electric field to a lesser extent.
Während bei Graphitdüsenschaltern aufgrund der hohen Leit¬ fähigkeit der Düsenkörper der Düεenabstand bei geöffnetem Schalter die';Feldstärke und deren Verlauf entlang der Düsen- kontur festlegt, wobei ein Mindestabstand für die auftreten¬ den Spannungsbeanspruchungen der Trennstrecke vorgegeben ist, lassen sich bei Isolierstoffdüsenschaltern die Elektroden- Abstände bei zumindest gleicher gas- und strömungstechnischer Wirksamkeit der Beblasung des Lichtbogens vergrößern.While in graphite nozzle switches, due to the high conductivity of the nozzle body, the distance between the nozzles when the switch is open, the '; Field strength and its course along the nozzle defines the contour, with a minimum distance being specified for the voltage stresses occurring in the isolating section, the distance between the electrodes in the case of insulating nozzle switches can be increased with at least the same gas and flow efficiency of the blowing of the arc.
Hierbei erweist es sich jedoch als ungünstig, daß die Iso- lierstoffdüsen das von den elektrisch leitenden Fassungen der Düsen gestaltete elektrische Feld in der Trennstrecke nur geringfügig beeinflussen.In this case, however, it proves to be unfavorable that the insulating material nozzles only have a slight influence on the electrical field in the separating section, which is formed by the electrically conductive versions of the nozzles.
Davon ausgehend liegt der Erfindung die Aufgabe zugrunde, einen Druckgasschalter der eingangs genannten Art anzugeben, bei dem die Vorteile der elektrisch leitenden Düsenkörper mit denen der elektrisch isolierenden Düsenkörper vereinigt sind.Proceeding from this, the object of the invention is to specify a compressed gas switch of the type mentioned at the outset, in which the advantages of the electrically conductive nozzle body are combined with those of the electrically insulating nozzle body.
Nach der Erfindung wird diese Aufgabe dadurch gelöst, daß die Düsenkörper aus einem schwach leitfähigen Kunststoff bestehen und daß das Oberbrückungsschaltstück mit einer Lichtbo- genelektrode ausgestattet ist, die mit einer zweiten Lichtbo¬ genelektrode am feststehenden Ablaufschaltstück das Lichtbo¬ genkontaktsystem bildet.According to the invention, this object is achieved in that the nozzle bodies consist of a weakly conductive plastic and in that the bridging contact is equipped with an arc electrode which forms the arcing contact system with a second arc electrode on the fixed drain contact.
Durch Anwendung der Erfindung wird das elektrische Feld in der Trennstrecke bei geöffnetem Schalter durch die Düsenkör¬ per bestimmt, weil sie aus einem schwach leitfähigen Kunst¬ stoff bestehen und als Feldelektroden wirken. Der schwach leitfähige Kunststoff der Düsenkörper ist aber nicht geeig¬ net, Lichtbogenfußpunkte des gezogenen Lichtbogens zu über- nehmen, so daß die Düsenkörper keine Kommutierungshilfe für den im Verlauf des Auschaltvorganges infolge der Beblasung verlängerten Lichtbogens bilden kann. Nachdem der Lichtbogen in das Innere der hohl ausgebildeten Schaltstücke eingetrie¬ ben ist, kann er im weiteren Verlauf der Ausεchalthandlung nicht wieder an der Düsenkontur ansetzen, so daß eine sichere Löschung bewirkt wird. Für die Ausbildung der Düsenkörper beim erfindungsgemäßen Druckgasschalter hat es sich als vorteilhaft erwiesen, wenn der schwach leitfähige Kunststoff einen spezifischen elek¬ trischen Widerstand von etwa 2xl03Ωcm hat.By using the invention, the electrical field in the isolating section is determined by the nozzle body when the switch is open, because they consist of a weakly conductive plastic and act as field electrodes. However, the weakly conductive plastic of the nozzle body is not suitable for taking over the arc base points of the drawn arc, so that the nozzle body cannot form a commutation aid for the arc which is lengthened as a result of the blowing in the course of the switching-off process. After the arc has entered the interior of the hollow switching elements, it cannot start again on the nozzle contour in the further course of the switch-off action, so that reliable extinguishing is brought about. For the formation of the nozzle body in the pressure gas switch according to the invention, it has proven to be advantageous if the weakly conductive plastic has a specific electrical resistance of approximately 2 × 10 3 Ωcm.
Bei einem bevorzugten Ausführungsbeispiel des Druckgasschal¬ ters nach der Erfindung bestehen die Düsenkörper aus einem mit Graphit versetzten Polytetrafluorethylen. Die zweite Lichtbogenelektröde kann hohlzylindrisch ausgebildet sein und den Düsenkörper des Ablaufschaltstücks bis in den Bereich der stirnseitigen Düsenöffnung umfassen. Dabei kann die zweite Lichtbogenelektrode aus Graphit bestehen.In a preferred embodiment of the pressure gas switch according to the invention, the nozzle bodies consist of a polytetrafluoroethylene mixed with graphite. The second arc electrode can be of hollow cylindrical design and can encompass the nozzle body of the discharge switching element as far as the area of the front nozzle opening. The second arc electrode can consist of graphite.
Anhand der Zeichnung ist ein Ausführungsbeispiel nach der Erfindung beschrieben und die Wirkungsweise erläutert.An exemplary embodiment according to the invention is described and the mode of operation explained with reference to the drawing.
In der Figur ist schematisch in einem Halbschnitt ein Druck¬ gasschalter mit den zum Verständnis der Erfindung notwendigen Teilen dargestellt, wobei oberhalb der Mittellinie die EinschaltStellung und unterhalb der Mittellinie 1 die kurz vor der Ausschaltstellung des Druckgasschalters erreichte Löschstellung gezeichnet ist.The figure shows schematically a half-section of a pressure gas switch with the parts necessary for understanding the invention, the switch-on position being drawn above the center line and the extinguishing position reached shortly before the switch-off position of the pressure gas switch is shown below the center line 1.
Der Druckgasschalter, der als Lösch- und Isoliermittel SFg enthält, weist zwei feststehende. Schaltstücke 2,3 auf, die voneinander in Abstand A angeordnet sind und zur Abfuhr von Schaltgasen hohl ausgebildet sind. Beide Schaltstücke 2,3 weisen stirnseitig in die vom Abstand A gebildete Trenn¬ strecke hineinragende Düsenkörper 4,5 auf, die aus einem un- ter Lichtbogeneinwirkung einen Löschgasbestandteil abgebenden Stoff aufweisen.The gas pressure switch, which contains SFg as the extinguishing and insulating agent, has two fixed ones. Switch pieces 2, 3 which are arranged at a distance A from one another and are hollow for the removal of switching gases. Both contact pieces 2, 3 have, on the end face, nozzle bodies 4, 5 which protrude into the separating distance formed by the distance A and which, under the action of an arc, contain a substance which releases an extinguishing gas component.
Der Druckgasschalter nach der Erfindung hat ein die beiden Schaltεtücke 2,3 in der Einschaltstellung überbrückendes be- wegliches Schaltstück 6 mit einer Mehrzahl von gleichmäßig über den Umfang verteilt angeordneten federbelasteten Kon¬ taktlamellen 7. Das bewegliche Schaltstück 6 gibt in der Aus- schaltstellung die vom Abstand A gebildete Trennstrecke frei. Ferner ist der Druckgasschalter nach der Erfindung mit einem beim Ausschalten einen Lichtbogen ziehenden Lichtbogenkon¬ taktsystem versehen, das aus einer ringförmigen Graphitelek- trode 8 am Ablaufschaltstück 3 einerseits und einem Abbrenn¬ ring 9 am Überbrückungsschaltstück 6 andererseits besteht. Die Düsenkörper 4,5 bestehen aus einem schwach leitfähigen Kunststoff, der einen spezifischen elektrischen Widerstand von etwa 2x103Ωcm hat. Hierzu können die Düsenkörper 4,5 aus einem mit Graphit versetzten Polytetrafluorethylen herge¬ stellt sein.The gas pressure switch according to the invention has a movable switching piece 6 bridging the two switching pieces 2, 3 in the switch-on position, with a plurality of spring-loaded contact plates 7 distributed uniformly over the circumference. The movable switching piece 6 outputs switch position the separation distance formed by the distance A free. Furthermore, the gas pressure switch according to the invention is provided with an arcing contact system which draws an arc when it is switched off and which consists of an annular graphite electrode 8 on the discharge switching element 3 on the one hand and a burn-off ring 9 on the bridging switching element 6 on the other hand. The nozzle body 4.5 consist of a weakly conductive plastic, which has a specific electrical resistance of about 2x10 3 Ωcm. For this purpose, the nozzle bodies 4, 5 can be produced from a polytetrafluoroethylene mixed with graphite.
Ersichtlich ist die zweite Lichtbogenelektrode 8 des Ablauf¬ schaltstückes 3 hohlzylindrisch ausgebildet, wobei sie den Düsenkörper 5 bis in den Bereich der stirnseitigen Düsenöff¬ nung umfaßt. Die zweite Lichtbogenelektrode 8 kann ebenso wie die erste Lichtbogenelektrode 9 aus Graphit bestehen.As can be seen, the second arc electrode 8 of the discharge switching element 3 is of hollow-cylindrical design, wherein it encompasses the nozzle body 5 up to the region of the end-side nozzle opening. The second arc electrode 8, like the first arc electrode 9, can consist of graphite.
Bei einer Oberführung des Druckgasschalters nach der Erfin- düng aus der oberhalb der Mittellinie 1 dargestellten Ein¬ schaltstellung in die unterhalb der Mittellinie 1 gezeichnete Löschstellung wird das Überbrückungsschaltstück 6 in Pfeilrichtung 10 durch einen nicht weiter dargestellten An¬ trieb bewegt, der gleichzeitig auch einen Blaszylinder 11 gegen einen feststehenden Blaskolben 12 bewegt. Dabei wird das im Raum 13 vorhandene Schwefelhexafluorid komprimiert, bis das Überbrückungsschaltstück 6 vom Ablaufschaltstück 3 abläuft und ein aus Kunststoffmaterial bestehendes Blasgitter 14 zur Steuerung der LöschgasStrömung in die Trennstrecke überführt. Wenn die Lichtbogenelektrode 9 von derWhen the compressed gas switch is routed from the switch-on position shown above the center line 1 into the extinguishing position shown below the center line 1, the bypass switch 6 is moved in the direction of the arrow 10 by a drive (not shown further), which at the same time also has a blowing cylinder 11 moved against a fixed blow piston 12. The sulfur hexafluoride present in the space 13 is compressed until the bypass switching element 6 runs off the sequence switching element 3 and a blowing grille 14 made of plastic material is transferred into the separating section to control the extinguishing gas flow. If the arc electrode 9 from the
Lichtbogenelektrode 8 abläuft, wird ein Lichtbogen gezogen, der unter der Wirkung der LöschgasStrömung in das Innere der Schaltstücke 2,3 getrieben wird und im weiteren Verlauf der Ausschalthandlung nicht an den mit 15 bezeichneten exponier- ten Stellen der Düsenkörper 4,5 rückzünden kann, weil der verwendete schwach leitfähige Kunststoff zur Führung eines Lichtbogenfußpunktes nicht geeignet ist. Die die Trennstrecke im Abstand A begrenzenden Düsenkörper 4,5 bilden jedoch aufgrund ihrer schwachen Leitfähigkeit Elektroden, die das Feld in der Trennstrecke günstig ge¬ stalten, so daß der Druckgasschalter nach der Erfindung einer Beanspruchung mit hohen Blitzstoßspannungen mit Sicherheit standhält. Arc electrode 8 runs, an arc is drawn, which is driven under the action of the extinguishing gas flow into the interior of the switching pieces 2,3 and in the further course of the switch-off action can not reignite at the exposed positions denoted by 15, the nozzle body 4.5 because the weakly conductive plastic used is not suitable for guiding an arc base. However, due to their weak conductivity, the nozzle bodies 4, 5 delimiting the separating distance at distance A form electrodes, which make the field in the separating distance favorable, so that the compressed gas switch according to the invention can withstand loads with high lightning impulse voltages with certainty.

Claims

Patentansprüche claims
1. Druckgasschalter mit zwei feststehenden, in Abstand von¬ einander angeordneten Schaltstücken, die zur Abfuhr von Schaltgasen hohl ausgebildet sind und stirnseitig in den Ab¬ stand hineinragende Düsenkörper aus einem unter Lichtbogen¬ einwirkung einen Löschgasbestandteil abgebenden Stoff aufwei¬ sen, mit einem diese Schaltstücke der Einschaltstellung über¬ brückenden und in der Ausschaltstellung zur Bildung einer Trennstrecke freigebenden beweglichen Schaltstück und mit einem beim Ausschalten den Lichtbogen ziehenden Lichtbogen¬ kontaktsystem, d a d u r c h g e k e n n z e i c h n e t , daß die Düsenkörper (4,5) aus einem schwach leitfähigen Kunststoff bestehen und daß das Überbrückungsschaltstück (6) mit einer Lichtbogenelektrode (9) ausgestattet ist, die mit einer zweiten Lichtbogenelektrode (8) am feststehenden Ab¬ laufschaltstück (3) das LichtbogenkontaktSystem bildet.1. Compressed gas switch with two fixed, spaced-apart switching pieces which are hollow for the removal of switching gases and which have nozzle bodies protruding into the distance at the end from a substance which releases an extinguishing gas component under the action of an arc, with one of these switching pieces bridging the switch-on position and releasing it in the switch-off position to form a separating distance and having an arcing contact system when the switch is switched off, characterized in that the nozzle bodies (4, 5) consist of a weakly conductive plastic and that the bypass switch (6 ) is equipped with an arcing electrode (9) which forms the arcing contact system with a second arcing electrode (8) on the fixed drain contact (3).
2. Druckgasschalter nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß der schwach leitfähige Kunststoff einen spezifischen elektrischen Widerstand von etwa 2x103Ωcm hat.2. Gas pressure switch according to claim 1, characterized in that the weakly conductive plastic has a specific electrical resistance of about 2x10 3 Ωcm.
3. Druckgasschalter nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , daß der Düsenkörper (4,5) aus einem mit Graphit versetzten Polytetrafluorethylen besteht. 3. Pressure gas switch according to claim 1 or 2, characterized in that the nozzle body (4,5) consists of a graphite-mixed polytetrafluoroethylene.
4. Druckgasschalter nach einem der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t , daß die zweite Lichtbogenelektrode (8) hohlzylindrisch ausge¬ bildet ist und den Düsenkörper (5) des Ablaufschaltstücks (3) bis in den Bereich der stirnseitigen Düsenöffnung umfaßt.4. Gas-blast switch according to one of claims 1 to 3, d a d u r c h g e k e n n z e i c h n e t that the second arc electrode (8) is hollow-cylindrical and comprises the nozzle body (5) of the drain switching element (3) up to the area of the front nozzle opening.
5. Druckgasschalter nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t , daß die zweite Lichtbogenelektrode (8) aus Graphit besteht. 5. Gas-blast switch according to claim 4, that the second arc electrode (8) is made of graphite.
EP94924695A 1993-09-21 1994-08-22 Gas pressure switch Ceased EP0720775A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4332886 1993-09-21
DE19934332886 DE4332886A1 (en) 1993-09-21 1993-09-21 Gas pressure switch
PCT/DE1994/000987 WO1995008836A1 (en) 1993-09-21 1994-08-22 Gas pressure switch

Publications (1)

Publication Number Publication Date
EP0720775A1 true EP0720775A1 (en) 1996-07-10

Family

ID=6498763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94924695A Ceased EP0720775A1 (en) 1993-09-21 1994-08-22 Gas pressure switch

Country Status (3)

Country Link
EP (1) EP0720775A1 (en)
DE (1) DE4332886A1 (en)
WO (1) WO1995008836A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19519992C2 (en) * 1995-05-24 2002-03-21 Siemens Ag Switching section for a high-voltage circuit breaker working with an extinguishing gas
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DE4129572C1 (en) * 1991-09-06 1992-12-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De Insulating compsn. for a nozzle in high tension switch - consisting of thermoplastic polymer e.g. polyether:imide and conductive polymer e.g. poly:pyrrole salt

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WO1995008836A1 (en) 1995-03-30

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