EP0028039B2 - Puffer type gas circuit-breaker - Google Patents

Puffer type gas circuit-breaker Download PDF

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Publication number
EP0028039B2
EP0028039B2 EP80200920A EP80200920A EP0028039B2 EP 0028039 B2 EP0028039 B2 EP 0028039B2 EP 80200920 A EP80200920 A EP 80200920A EP 80200920 A EP80200920 A EP 80200920A EP 0028039 B2 EP0028039 B2 EP 0028039B2
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EP
European Patent Office
Prior art keywords
contact
switching element
burn
movable
current
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Expired
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EP80200920A
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German (de)
French (fr)
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EP0028039A1 (en
EP0028039B1 (en
Inventor
Guido Huser
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BBC Brown Boveri AG Switzerland
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BBC Brown Boveri AG Switzerland
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Publication of EP0028039B2 publication Critical patent/EP0028039B2/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
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7023—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts

Definitions

  • the present invention relates to a gas pressure switch according to the preamble of claim 1.
  • Such a switch is known, for example, from "Brown Boveri Mitt.”, 64, 1977 (11), p. 629, Figure 1.
  • an insulating nozzle and the blowing cylinder of the compression device are attached to the movable extinguishing current switch, which must be moved together with the movable extinguishing current switch during each switching operation.
  • the relatively large moving masses cause an undesirable contact bounce when switched on and delay the separation speed of the contacts when switched off.
  • a compressed gas switch with a fixed and a comparatively large mass, movable extinguishing current switching piece in which the erosion contact of the moving extinguishing current switching element inside this switching element is arranged displaceably in the direction of its movement and in the switched-on position both the erosion contact of the fixed one Extinguishing current contact contacted as well as under the action of a loaded spring.
  • the movable quenching current switch shows parts which act as contact elements and which are supported in the switched-on position on the fixed quenching current switch and in the switched-off position on the erosion contact of the movable quenching current switch. With this switch, the bouncing of the movable extinguishing current switching element is reduced when the spring-loaded erosion contact hits the fixed extinguishing current switching element when it is switched on.
  • a pressure gas switch known from DE-B 1 156143, in which a spring-loaded tube, which is arranged in a hollow movable contact piece and is displaceable in its direction of movement and acts as a burn-up contact, reduces the contact bounce by prior impact on a fixed contact piece, but not prevents the moving contact from subsequently colliding with the fixed contact.
  • the first part of the contact of the movable extinguishing current switching piece which is designed as a stroke contact, meets the contact of the fixed extinguishing current switching piece when switched on. Since the mass of this part is almost negligible compared to the masses of the movable extinguishing current switching element, the movable part of the compression device and the insulating nozzle, contact bounce is almost avoided.
  • the second part of the stroke contact which is rigidly connected to the carrier part of the extinguishing current switching element, "only serves to accommodate the base point of the switching arc, since this avoids unnecessary mechanical friction between the extinguishing contacts.
  • the compressed gas switch is not only extremely easy to repair, but is also characterized by the fact that the dynamic current forces that occur when switching on are almost complete be eliminated.
  • the figure shows a plan view of a longitudinal section through the circuit breaker according to the invention, this switch being shown in the left half of the figure when switched on and in the right half of the figure when switched off.
  • the numbers 10 and 11 denote power connections of the pressure gas switch.
  • a spring-mounted nominal current contact 20 is connected to the current connection 10 and, in the switched-on state, leads the nominal current to the current connection 11 via a movable nominal current contact 21, which is designed as a blowing cylinder of a compression device in the lower part.
  • a fixed, cylindrical extinguishing current switching piece 30 has a hollow carrier part 31 provided with openings 33 and a contact 32 attached to the end of the carrier part 31. With this fixed contact 32, a movable extinguishing current switching piece 40 is in front contact in the switched-on position.
  • the movable extinguishing current switching element 40 has a support part 41 provided with openings 43 and a stroke contact 42.
  • the stroke contact 42 has an axially displaceably arranged contact device in the interior of the carrier part 41, comprising a pressure ring 421 and contact finger 422, and an annular erosion ring 423 fastened to the end face of the carrier part 41 facing the fixed extinguishing current switching element 30.
  • the pressure ring 421 is provided with ball heads 424, which press the contact fingers 422 against the inner wall of the carrier part 41 under the action of a spring 50.
  • the inner diameter of the annular erosion ring 423 is larger than the outer diameter of the contact 32 of the fixed extinguishing current switching piece 30 and smaller than the outside diameter of the axially displaceably arranged contact device of the movable extinguishing current switching element 40.
  • a fixed blow piston which, like the nominal current contact 21 connected to the carrier part 41 of the movable extinguishing current switching element 40 via conductive connecting webs 61, belongs to a compression device for compressed gas.
  • This compressed gas is passed through a channel 71 and an annular nozzle opening to the arc drawn when switching off.
  • the channel 71 and the annular nozzle opening are formed by the movable extinguishing current switching element 40 and an insulating material nozzle 70 surrounding the extinguishing current switching element 40 at a distance.
  • the arc is blown by the compressed gas flow which begins after the extinguishing current switching elements 30, 40 have been separated via the channel 71 and the annular nozzle opening.
  • This compressed gas flow is particularly intensive in that the compressed gas was precompressed before the two extinguishing flow switching elements 30, 40 were separated. Since the contact fingers 422, like the contact 32, delimit a nozzle-shaped opening, the arc base points are blown particularly intensively via the hollow carrier parts 31, 41 and the openings 33, 43 before the pressure gas is removed.
  • the drive of the movable extinguishing current switching element 40 is supported by the loaded spring 50 acting in the switch-off direction, as a result of which a high separation speed of the extinguishing current switching elements 30, 40 is achieved.
  • the movable extinguishing current switching piece 40 When switched on, the movable extinguishing current switching piece 40 is moved in the opposite direction. A switch-on arc that may occur is drawn between the erosion ring 423 and the fixed contact 32. When the contact fingers 422 strike the contact 32, this arc disappears. Since the contact fingers 422 and the pressure ring 421 are the only parts which are braked here, and since these parts have only a very low mass compared to the mass of the other moving parts and are also under the action of the now tensioned spring 50, there is no need Contact bounces almost completely. The repulsive forces caused by the inrush current are overcome by the force of the tensioned spring 50. After completion of the switch-on process, the spring 50 is charged with potential energy, which is now available again for the switch-off process.

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  • Circuit Breakers (AREA)

Description

Die vorliegende Erfindung bezieht sich auf einen Druckgasschalter gemäss dem Oberbegriff des Patentanspruchs 1.The present invention relates to a gas pressure switch according to the preamble of claim 1.

Ein derartiger Schalter ist beispielsweise aus den «Brown Boveri Mitt.», 64, 1977 (11), S. 629, Bild 1, bekannt. Bei diesem Schalter sind am beweglichen Löschstromschaltstück eine Isolierstoffdüse und der Blaszylinder der Kompressionsvorrichtung angebracht, welche bei jedem Schaltvorgang zusammen mit dem beweglichen Löschstromschaltstück bewegt werden müssen. Die verhältnismässig grossen bewegten Massen bewirken hierbei beim Einschalten ein unerwünschtes Kontaktprellen und verzögern beim Ausschalten die Trenngeschwindigkeit der Kontakte.Such a switch is known, for example, from "Brown Boveri Mitt.", 64, 1977 (11), p. 629, Figure 1. In this switch, an insulating nozzle and the blowing cylinder of the compression device are attached to the movable extinguishing current switch, which must be moved together with the movable extinguishing current switch during each switching operation. The relatively large moving masses cause an undesirable contact bounce when switched on and delay the separation speed of the contacts when switched off.

Aus FR-A 2346841 ist ferner ein Druckgasschalter mit einem feststehenden und einem eine vergleichsweise grosse Masse aufweisenden, beweglichen Löschstromschaltstück bekannt, bei dem der Abbrandkontakt des beweglichen Löschstromschaltstückes im Inneren dieses Schaltstückes in dessen Bewegungsrichtung verschieblich angeordnet ist und in der Einschaltstellung sowohl den Abbrandkontakt des feststehenden Löschstromschaltstückes kontaktiert als auch unter der Wirkung einer geladenen Feder steht. An seinem freien Ende zeigt das bewegliche Löschstromschaltstück ersichtlich als Kontaktelemente wirkende Teile auf, welche in der Einschaltstellung auf dem feststehenden Löschstromschaltstück und in der Ausschaltstellung auf dem Abbrandkontakt des beweglichen Löschstromschaltstückes abgestützt sind. Bei diesem Schalter wird beim Einschalten das Prellen des beweglichen Löschstromschaltstückes durch das vorgängig erfolgende Aufschlagen des federbelasteten Abbrandkontaktes auf das feststehende Löschstromschaltstück reduziert.From FR-A 2346841 a compressed gas switch with a fixed and a comparatively large mass, movable extinguishing current switching piece is known, in which the erosion contact of the moving extinguishing current switching element inside this switching element is arranged displaceably in the direction of its movement and in the switched-on position both the erosion contact of the fixed one Extinguishing current contact contacted as well as under the action of a loaded spring. At its free end, the movable quenching current switch shows parts which act as contact elements and which are supported in the switched-on position on the fixed quenching current switch and in the switched-off position on the erosion contact of the movable quenching current switch. With this switch, the bouncing of the movable extinguishing current switching element is reduced when the spring-loaded erosion contact hits the fixed extinguishing current switching element when it is switched on.

Entsprechendes gilt auch für einen aus DE-B 1 156143 bekannten Druckgasschalter, bei dem zwar ein in einem hohlen beweglichen Schaltstück in dessen Bewegungsrichtung verschieblich angeordnetes und als Abbrandkontakt wirkendes, federbelastetes Rohr beim Einschalten das Kontaktprellen durch vorgängiges Aufschlagen auf ein feststehendes Schaltstück reduziert, jedoch nicht verhindert, dass das bewegliche Schaltstück nachfolgend gegen das feststehende Schaltstück prallt.The same also applies to a pressure gas switch known from DE-B 1 156143, in which a spring-loaded tube, which is arranged in a hollow movable contact piece and is displaceable in its direction of movement and acts as a burn-up contact, reduces the contact bounce by prior impact on a fixed contact piece, but not prevents the moving contact from subsequently colliding with the fixed contact.

Es ist Aufgabe der Erfindung, einen Druckgasschalter der eingangs genannten Art zu schaffen, welcher die Nachteile des bekannten Schalters nicht aufweist, und bei dem das Kontaktprellen nicht nur auf ein erwünschtes Mass reduziert, sondern sogar nahezu vollständig vermieden wird.It is an object of the invention to provide a gas pressure switch of the type mentioned at the outset, which does not have the disadvantages of the known switch and in which contact bouncing is not only reduced to a desired extent, but is almost completely avoided.

Die vorgenannte Aufgabe wird erfindungsgemäss durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.According to the invention, the aforementioned object is achieved by the characterizing features of patent claim 1.

Bei dem erfindungsgemässen Druckgasschalter trifft beim Einschalten lediglich das erste Teil des als Hubkontakt ausgebildeten Kontaktes des beweglichen Löschstromschaltsückes auf den Kontakt des festen Löschstromschaltstückes. Da die Masse dieses Teiles verglichen mit den Massen des beweglichen Löschstromschaltstückes, des beweglichen Teiles der Kompressionsvorrichtung und der Isolierstoffdüse fast vernachlässigbar ist, wird Kontaktprellen nahezu vermieden. Darüber hinaus ist es vorteilhaft, dass das zweite, mit dem Trägerteil des Löschstromschaltstückes starr verbundene Teil des Hubkontaktes" lediglich der Aufnahme des Fusspunktes des Schaltlichtbogens dient, da hierdurch unnötige mechanische Reibung zwischen den Löschkontakten vermieden wird. Da ein Teil der für das Ausschalten notwendigen Antriebsenergie bereits in einem geladenen Federspeicher vorliegt, wird beim Ausschalten eine hohe Trenngeschwindigkeit der Löschstromschaltstücke und dadurch eine kurze Lichtbogendauer erreicht. Der Druckgasschalter lässt sich nicht nur äusserst leicht reparieren, sondern zeichnet sich darüber hinaus auch dadurch aus, dass die beim Einschalten auftretenden dynamischen Stromkräfte nahezu vollständig eliminiert werden.In the compressed gas switch according to the invention, only the first part of the contact of the movable extinguishing current switching piece, which is designed as a stroke contact, meets the contact of the fixed extinguishing current switching piece when switched on. Since the mass of this part is almost negligible compared to the masses of the movable extinguishing current switching element, the movable part of the compression device and the insulating nozzle, contact bounce is almost avoided. In addition, it is advantageous that the second part of the stroke contact, which is rigidly connected to the carrier part of the extinguishing current switching element, "only serves to accommodate the base point of the switching arc, since this avoids unnecessary mechanical friction between the extinguishing contacts. Because part of the drive energy required for switching off If the spring-loaded circuit breaker is already in a charged spring accumulator, a high separation speed of the extinguishing current switching elements and therefore a short arcing time is achieved. The compressed gas switch is not only extremely easy to repair, but is also characterized by the fact that the dynamic current forces that occur when switching on are almost complete be eliminated.

In der Zeichnung ist ein Ausführungsbeispiel des Erfindungsgegenstandes vereinfacht wiedergegeben.An exemplary embodiment of the subject matter of the invention is shown in simplified form in the drawing.

Die Figur zeigt eine Aufsicht auf einen Längsschnitt durch den erfindungsgemässen Leistungsschalter, wobei dieser Schalter in der linken Hälfte der Figur im eingeschalteten und in der rechten Hälfte der Figur im ausgeschalteten Zustand dargestellt ist.The figure shows a plan view of a longitudinal section through the circuit breaker according to the invention, this switch being shown in the left half of the figure when switched on and in the right half of the figure when switched off.

In der Figur bezeichnen die Ziffern 10 und 11 Stromanschlüsse des Druckgasschalters. Mit dem Stromanschluss 10 ist ein federnd befestigter Nennstromkontakt 20 verbunden, welcher im Einschaltzustand den Nennstrom über einen beweglichen Nennstromkontakt 21, welcher im unteren Teil als Blaszylinder einer Kompressionsvorrichtung ausgebildet ist, zum Stromanschluss 11 geleitet. Ein festes, zylinderförmiges Löschstromschaltstück 30 weist ein hohles, mit Öffnungen 33 versehenes Trägerteil 31 und einen am Trägerteil 31 stirnseitig angebrachten Kontakt 32 auf. Mit diesem festen Kontakt 32 befindet sich in der Einschaltstellung ein bewegliches Löschstromschaltstück 40 stirnseitig in Kontakt. Das bewegliche Löschstromschaltstück 40 weist ein mit Öffnungen 43 versehenes Trägerteil 41 und einen Hubkontakt 42 auf.In the figure, the numbers 10 and 11 denote power connections of the pressure gas switch. A spring-mounted nominal current contact 20 is connected to the current connection 10 and, in the switched-on state, leads the nominal current to the current connection 11 via a movable nominal current contact 21, which is designed as a blowing cylinder of a compression device in the lower part. A fixed, cylindrical extinguishing current switching piece 30 has a hollow carrier part 31 provided with openings 33 and a contact 32 attached to the end of the carrier part 31. With this fixed contact 32, a movable extinguishing current switching piece 40 is in front contact in the switched-on position. The movable extinguishing current switching element 40 has a support part 41 provided with openings 43 and a stroke contact 42.

Der Hubkontakt 42 besitzt eine im Inneren des Trägerteils 41 axial verschieblich angeordnete, einen Druckring 421 und Kontaktfinger 422 umfassende Kontakteinrichtung sowie einen an der dem festen Löschstromschaltstück 30 zugewandten Stirnseite des Trägerteils 41 befestigten, ringförmigen Abbrandring 423. Der Druckring 421 ist mit Kugelköpfen 424 versehen, welche unter der Wirkung einer Feder 50 die Kontaktfinger 422 gegen die Innenwand des Trägerteils 41 drücken. Der Innendurchmesser des ringförmigen Abbrandringes 423 ist grösser als der Aussendurchmesser des Kontaktes 32 des festen Löschstromschaltstückes 30 und kleiner als der Aussendurchmesser der axial verschieblich angeordneten Kontakteinrichtung des beweglichen Löschstromschaltstückes 40.The stroke contact 42 has an axially displaceably arranged contact device in the interior of the carrier part 41, comprising a pressure ring 421 and contact finger 422, and an annular erosion ring 423 fastened to the end face of the carrier part 41 facing the fixed extinguishing current switching element 30. The pressure ring 421 is provided with ball heads 424, which press the contact fingers 422 against the inner wall of the carrier part 41 under the action of a spring 50. The inner diameter of the annular erosion ring 423 is larger than the outer diameter of the contact 32 of the fixed extinguishing current switching piece 30 and smaller than the outside diameter of the axially displaceably arranged contact device of the movable extinguishing current switching element 40.

Mit 60 ist ein fester Blaskolben bezeichnet, welcher ebenso wie der über leitende Verbindungsstege 61 mit dem Trägerteil 41 des beweglichen Löschstromschaltstückes 40 verbundene Nennstromkontakt 21 zu einer Kompressionsvorrichtung für Druckgas gehört. Dieses Druckgas wird über einen Kanal 71 und eine ringförmige Düsenöffnung an den beim Ausschalten gezogenen Lichtbogen geleitet. Der Kanal 71 und die ringförmige Düsenöffnung werden durch das bewegliche Löschstromschaltstück 40 und eine das Löschstromschaltstück 40 mit Abstand umgebende Isolierstoffdüse 70 gebildet.60 denotes a fixed blow piston, which, like the nominal current contact 21 connected to the carrier part 41 of the movable extinguishing current switching element 40 via conductive connecting webs 61, belongs to a compression device for compressed gas. This compressed gas is passed through a channel 71 and an annular nozzle opening to the arc drawn when switching off. The channel 71 and the annular nozzle opening are formed by the movable extinguishing current switching element 40 and an insulating material nozzle 70 surrounding the extinguishing current switching element 40 at a distance.

Die Wirkungsweise des erfindungsgemässen Druckgasschalters ist die folgende:

  • Beim Ausschalten werden der bewegliche Nennstromkontakt 21 und das bewegliche Löschstromschaltstück 40 nach unten bewegt. Sobald der Kontakt zwischen den Nennstromkontakten 20 und 21 aufgehoben ist, kommutiert der Strom auf die Löschstromschaltstücke 30, 40 und fliesst nun vom Stromanschluss 10 über das Trägerteil 31 und den Kontakt 32, die Kontaktfinger 422, das Trägerteil 41, die Verbindungsstege 61 und den Nennstromkontakt 21 zum Stromanschluss 11. Da der Innendurchmesser des Abbrandringes 423 kleiner als der Aussendurchmesser der Kontaktfinger 422 des beweglichen Löschstromschaltstückes 40 ist, schlägt der Abbrandring 423 nach weiterer Abwärtsbewegung des beweglichen Löschstromschaltstückes 40 an die durch den Druckring 421 und die Feder 50 gegen den festen Löschkontakt 32 gepressten Kontaktfinger 422 an, wodurch diese ebenfalls abwärts bewegt werden. Der Abbrandring 423 ist nun so ausgebildet, dass der durch die Abwärtsbewegung der Kontaktfinger 422 zwischen den Kontaktfingern und dem Kontakt 32 gezogene Lichtbogen nur eine verglichen mit der Ausschaltdauer geringe Zeit auf den Kontaktfingern 422 verbleibt. Um dies zu erreichen, ist der Abbrandring 423 so beschaffen, dass der Abstand zwischen dem Abbrandring 423 und dem Kontakt 32 des festen Löschstromschaltstückes 30 nach Abheben der Kontaktfinger 422 vom Kontakt 32 kleiner ist als der Abstand zwischen den Kontaktfingern 422 und dem Kontakt 32 während des weiteren Weges des beweglichen Löschstromschaltstückes 40. Dadurch brennt der Lichtbogen nur noch zwischen dem Abbrandring 423 und dem festen Kontakt 32.
The mode of operation of the compressed gas switch according to the invention is as follows:
  • When switching off, the movable rated current contact 21 and the movable quenching current switch 40 are moved downward. As soon as the contact between the nominal current contacts 20 and 21 is removed, the current commutates to the extinguishing current switching elements 30, 40 and now flows from the current connection 10 via the carrier part 31 and the contact 32, the contact fingers 422, the carrier part 41, the connecting webs 61 and the nominal current contact 21 to the power connection 11. Since the inside diameter of the erosion ring 423 is smaller than the outside diameter of the contact fingers 422 of the movable extinguishing current switching element 40, after further downward movement of the movable extinguishing current switching element 40, the erosion ring 423 strikes against the fixed extinguishing contact 32 by the pressure ring 421 and the spring 50 pressed contact finger 422, whereby they are also moved downward. The erosion ring 423 is now designed such that the arc drawn by the downward movement of the contact fingers 422 between the contact fingers and the contact 32 only remains on the contact fingers 422 for a short time compared to the switch-off time. To achieve this, the erosion ring 423 is such that the distance between the erosion ring 423 and the contact 32 of the fixed extinguishing current switching element 30 after the contact fingers 422 have been lifted off from the contact 32 is smaller than the distance between the contact fingers 422 and the contact 32 during the further path of the movable extinguishing current switching element 40. As a result, the arc burns only between the erosion ring 423 and the fixed contact 32.

Der Lichtbogen wird durch die nach Trennung der Löschstromschaltstücke 30, 40 über den Kanal 71 und die ringförmige Düsenöffnung einsetzende Druckgasströmung beblasen. Diese Druckgasströmung ist insofern besonders intensiv, da das Druckgas vor Trennung der beiden Löschstromschaltstücke 30, 40 vorkomprimiert wurde. Da die Kontaktfinger 422 hierbei ebenso wie der Kontakt 32 eine düsenförmige Öffnung begrenzen, werden die Lichtbogenfusspunkte vor Entfernung des Druckgases über die hohlen Trägerteile 31, 41 und die Öffnungen 33, 43 besonders intensiv beblasen. Der Antrieb des beweglichen Löschstromschaltstückes 40 wird durch die geladene, in Ausschaltrichtung wirkende Feder 50 unterstützt, wodurch eine hohe Trenngeschwindigkeit der Löschstromschaltstücke 30, 40 erreicht wird.The arc is blown by the compressed gas flow which begins after the extinguishing current switching elements 30, 40 have been separated via the channel 71 and the annular nozzle opening. This compressed gas flow is particularly intensive in that the compressed gas was precompressed before the two extinguishing flow switching elements 30, 40 were separated. Since the contact fingers 422, like the contact 32, delimit a nozzle-shaped opening, the arc base points are blown particularly intensively via the hollow carrier parts 31, 41 and the openings 33, 43 before the pressure gas is removed. The drive of the movable extinguishing current switching element 40 is supported by the loaded spring 50 acting in the switch-off direction, as a result of which a high separation speed of the extinguishing current switching elements 30, 40 is achieved.

Beim Einschalten wird das bewegliche Löschstromschaltstück40 in umgekehrter Richtung bewegt. Ein gegebenenfalls auftretender Einschaltlichtbogen wird hierbei zwischen dem Abbrandring 423 und dem festen Kontakt 32 gezogen. Beim Auftreffen der Kontaktfinger 422 auf den Kontakt 32 verschwindet dieser Bogen. Da die Kontaktfinger 422 und der Druckring 421 die einzigen Teile sind, welche hierbei abgebremst werden, und da diese Teile verglichen mit der Masse der übrigen bewegten Teile nur eine sehr geringe Masse aufweisen und ausserdem unter der Wirkung der nunmehr gespannten Feder 50 stehen, entfällt ein Kontaktprellen nahezu vollständig. Die durch den Einschaltstrom hervorgerufenen Abstosskräfte werden durch die Kraft der gespannten Feder 50 überwunden. Nach Beendigung des Einschaltvorganges ist die Feder 50 mit potentieller Energie aufgeladen, welche nun wieder für den Ausschaltvorgang zur Verfügung steht.

Figure imgb0001
When switched on, the movable extinguishing current switching piece 40 is moved in the opposite direction. A switch-on arc that may occur is drawn between the erosion ring 423 and the fixed contact 32. When the contact fingers 422 strike the contact 32, this arc disappears. Since the contact fingers 422 and the pressure ring 421 are the only parts which are braked here, and since these parts have only a very low mass compared to the mass of the other moving parts and are also under the action of the now tensioned spring 50, there is no need Contact bounces almost completely. The repulsive forces caused by the inrush current are overcome by the force of the tensioned spring 50. After completion of the switch-on process, the spring 50 is charged with potential energy, which is now available again for the switch-off process.
Figure imgb0001

Claims (1)

  1. Compressed-gas switch, having a fixed (30) and a movable cylindrical extinction current-switching element (40), which extinction current-switching elements (30,40) are arranged coaxially and, in the on-position, are telescoped into one another with their free ends formed as burn-up contacts (contact 32, burn-up ring (423), wherein the burn-up contacts (contact 32, burn-up ring 423) are each rigidly connected to a support part (31, 41) and the movable extinction current-switching element (40) is constructed to be tubular and is connected to a nozzle (70) of insulating material and to the movalbe part of a compression device, characterized in that the internal diameter of the burn-up contact (burn-up ring 423) of the movable extinction current-switching element (40) is greater than the external diameter of the burn-up contact (contact 32) of the fixed extinction current-switching element (30), and that the support part (41) of the movable extinction current-switching element (40) contains a contact device which is arranged to be displaceable in the axial direction and in the on-position, both contacts the burn-up contact (contact 32) of the fixed extinction current-switching element (30) and is under the influence of a loaded spring (50) and the external diameter of which is greater than the internal diameter of the burn-up contact (burn-up ring 423) of the movable extinction current-switching element (40), the contact device having contact fingers (422) and a thrust collar (421) provided with spherical heads (424), and that the spring (50) is attached between the thrust collar (421) and a stop on the support part (41) or on the drive of the movable extinction current-switching element (40).
EP80200920A 1979-10-25 1980-10-01 Puffer type gas circuit-breaker Expired EP0028039B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH9576/79 1979-10-25
CH957679 1979-10-25

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EP0028039A1 EP0028039A1 (en) 1981-05-06
EP0028039B1 EP0028039B1 (en) 1983-02-23
EP0028039B2 true EP0028039B2 (en) 1986-12-10

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EP80200920A Expired EP0028039B2 (en) 1979-10-25 1980-10-01 Puffer type gas circuit-breaker

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US (1) US4371766A (en)
EP (1) EP0028039B2 (en)
CA (1) CA1137531A (en)
DE (2) DE2946715A1 (en)

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Publication number Priority date Publication date Assignee Title
IT1196105B (en) * 1984-05-10 1988-11-10 Sace Spa HIGH VOLTAGE ELECTRIC SWITCH WITH ARC EXTINGUISHING DEVICE BY SELF-GENERATION OF PRESSURE OF AN EXTINGUISHING FLUID
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FR2647254B1 (en) * 1989-05-19 1991-07-05 Alsthom Gec MEDIUM VOLTAGE CIRCUIT BREAKER AT HIGH RATED CURRENT
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Also Published As

Publication number Publication date
DE2946715A1 (en) 1981-05-07
EP0028039A1 (en) 1981-05-06
CA1137531A (en) 1982-12-14
US4371766A (en) 1983-02-01
DE3062136D1 (en) 1983-03-31
EP0028039B1 (en) 1983-02-23

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