EP0035581B1 - Gas-blast circuit breaker - Google Patents

Gas-blast circuit breaker Download PDF

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Publication number
EP0035581B1
EP0035581B1 EP80101206A EP80101206A EP0035581B1 EP 0035581 B1 EP0035581 B1 EP 0035581B1 EP 80101206 A EP80101206 A EP 80101206A EP 80101206 A EP80101206 A EP 80101206A EP 0035581 B1 EP0035581 B1 EP 0035581B1
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EP
European Patent Office
Prior art keywords
chamber
gas
pump cylinder
movable contact
pump
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.)
Expired
Application number
EP80101206A
Other languages
German (de)
French (fr)
Other versions
EP0035581A1 (en
Inventor
Adrian W. Dr. Roth
Hans-Rudolf Wüthrich
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.)
Rockwell Automation Switzerland GmbH
Original Assignee
Sprecher und Schuh 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 Sprecher und Schuh AG filed Critical Sprecher und Schuh AG
Priority to AT80101206T priority Critical patent/ATE5358T1/en
Priority to DE8080101206T priority patent/DE3065575D1/en
Priority to EP80101206A priority patent/EP0035581B1/en
Priority to US06/183,428 priority patent/US4368367A/en
Priority to CA000361795A priority patent/CA1148594A/en
Publication of EP0035581A1 publication Critical patent/EP0035581A1/en
Application granted granted Critical
Publication of EP0035581B1 publication Critical patent/EP0035581B1/en
Expired legal-status Critical Current

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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
    • H01H33/88—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
    • H01H2033/906—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 with pressure limitation in the compression volume, e.g. by valves or bleeder openings
    • 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

Definitions

  • the invention relates to a gas pressure switch with a fixed and with a movable contact piece, which can be brought into and out of engagement with one another in a switching chamber, the switching chamber being connected to an expansion space on the one hand via a blowing nozzle which is closed by the movable contact piece in the switched-on position and on the other hand via a non-return valve opening towards the switching chamber is connected to the pressure side of a pump cylinder arranged in a stationary manner in the expansion space, to which a movable pump piston is assigned, which during "a switch-off stroke pressurizes the pump cylinder with a time delay.
  • Such a pressure gas switch is known for example from DE-A-27 50 762 (Fig. 2).
  • the desired time delay of the actual pump stroke of the pump piston is achieved in that the movable contact piece or its switching rod is coupled to the pump piston via a spring-loaded drag connection, so that the pump piston only begins its pump stroke when the pump is switched off. when the movable contact piece or its switching rod has covered a part of the switch-off stroke determined by the type of towing connection.
  • the time delay of the pump stroke is desirable because quenching gas under pressure to blow the resulting switching arc is not necessary at the beginning of the switch-off stroke, so that the power to be carried out by the switch drive to carry out the pump stroke is initially fully to accelerate the moving parts of the switch from the switch-on position out is available.
  • the pump piston is therefore limitedly movable with respect to the movable contact piece or its switching rod and, moreover, the drive at the beginning of the switch-off stroke still has to overcome the force of the spring provided in the towing connection.
  • the mobility of the pump piston with respect to the movable contact piece is no longer fully guaranteed. is accomplished, i.e. If the towing connection no longer functions or only functions slowly, then the pump stroke begins at the known switch at the beginning of the switch-off stroke, that is, too early, for which the performance of the switch drive may not be sufficient.
  • the pressure gas switch 10 shown has a housing 11 made of an insulating material, which is filled with an extinguishing gas, for example SFg, and is sealed off from the outside, the interior of which is divided by a partition wall 12 into a switching chamber 13 and into an expansion space 14.
  • a fixed contact 15 is arranged in the switching chamber 13, which is led out through the upper end wall 16 of the housing and is anchored in this end wall.
  • the stationary contact 15 has a ring of resilient contact fingers 17, which - held by a conductive sleeve 18 surrounding the ring - has an erosion ring 19 upstream.
  • a movable, pin-shaped contact piece 20 extends - in the pulled-out switch-on position - through a hub-like passage formed in the partition wall 12 and acting as a blowing nozzle 21 and engages with its free end 22 in the ring of contact fingers 17.
  • the movable contact piece 20 extends coaxially through the expansion space 14 and is coupled at its lower end via an isolating switch rod 23 to a drive 24, only shown schematically, with which the movable contact piece 20 is axially displaceable.
  • the movable contact piece 20 is guided through a set of sliding contacts 25, which in turn are fastened to a ring 26 which forms the inner end of a connecting conductor 27. This is fastened tightly at 28 in the housing 11 and led out laterally from this.
  • a pump cylinder 30 is arranged in the expansion space 17, for example by means of radial struts 29 with respect to the housing 11.
  • a suction valve 32 which is only shown schematically, and a spring-loaded pressure valve 33 which opens outwards.
  • a through bore 34 provided with seals is provided in the bottom 31 for the movable contact piece 20. From the part of the side wall of the pump cylinder adjoining the base 31 30 goes out a pressure line 35, which leads through the partition 12 into the switching chamber 13, and which is provided at its end with a check valve 36 opening towards the switching chamber 13.
  • a pump piston 37 is firmly anchored to the movable contact piece 20 and is in the switched-on position outside the pump cylinder 30 provided with a countersink 38. Only when the momentary system of the movable contact piece 20 is dotted (corresponds approximately to the minimum extinguishing distance) does the pump piston 37 move into the pump cylinder 30 and then displace the extinguishing gas there until the switch position indicated by the dashed line is reached.
  • the stationary contact piece 15 and the blowing nozzle 21 are surrounded by a hollow cylinder 39. Its annular end walls 40, 41, which are set back somewhat from its base lines, are fastened to the outside of the sleeve 18 or the blowing nozzle 21.
  • This hollow cylinder 39 thus divides the switching chamber 13 with its end walls 40, 41 into an actual arc space 42 which directly contains the switching path and into a pressure storage space 43 with a larger volume.
  • Spring-loaded pressure relief valves 44 are installed in the end wall 40, which open towards the pressure accumulator space 43, while non-return valves 45 opening towards the arc chamber 42 are installed in the end wall 41.
  • the pressure increase in the arc space 42 is greater, so that a part of this higher compressed quenching gas escapes from the arc space 42 through the pressure relief valves 44 upwards into the pressure storage space 42.
  • the entire pressure storage space also experiences an increase in pressure, but there is still fresh, uncontaminated extinguishing gas in its lower region.
  • the pressure from the arc chamber 42 is immediately discharged through the blowing nozzle 21, and the check valves 45 open simultaneously, so to speak, so that practically fresh extinguishing gas flows in from the pressure storage chamber 43 and also blows the switching arc. Even before the extinguishing gas displaced from the pump cylinder 30 is added.
  • the switching arc is blown in a similar manner, the extinguishing gas displaced from the pump cylinder being used somewhat later, however, because the increased pressure in the pressure storage space 43 initially still keeps the check valve 36 closed.
  • the pressure relief valve 33 is provided, which opens as long as the pressure in the pressure storage space 43 is still higher than the pressure in the pump cylinder 30 (as a result the check valve 36 remains closed), which in turn is sufficiently high to overcome the spring force of the pressure relief valve 33.

Landscapes

  • Circuit Breakers (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Combustion (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

A fixed contact element and a movable contact element can be brought into and out of engagement with one another within a switching chamber. The switching chamber flow communicates, on the one hand, by means of a blast nozzle, closed by the movable contact element in the cut-on position of the gas-blast switch, with an expansion chamber and, on the other hand, flow communicates by means of a check or a non-return valve which opens in the direction of the switching chamber, with the pressure side of a pump cylinder arranged in the expansion chamber. Operatively associated with the pump cylinder is a movable pump piston which pressurizes the pump cylinder during a cut-off stroke with a time-delay. To reduce the constructional expenditure and to increase the operational reliability the pump piston is rigidly connected with the movable contact element, whereas the length of the pump cylinder is less than the switching stroke of the movable contact element, so that the pump piston is located externally of the pump cylinder at the region of the cut-on position of the gas-blast switch.

Description

Die Erfindung betrifft einen Druckgasschalter mit einem festen und mit einem beweglichen Kontaktstück, die in einer Schaltkammer in und ausser Eingriff miteinander bringbar sind, wobei die Schaltkammer einerseits über eine in Einschaltstellung durch das bewegliche Kontaktstück verschlossene Blasdüse mit einem Expansionsraum in Verbindung steht und andererseits über ein zur Schaltkammer hin öffnendes Rückschlagventil an die Druckseite eines ortsfest im Expansionsraum angeordneten Pumpzylinders angeschlossen ist, welchem ein beweglicher Pumpkolben zugeordnet ist, der bei" einem Ausschalthub den Pumpzylinder mit zeitlicher Verzögerung unter Druck stezt.The invention relates to a gas pressure switch with a fixed and with a movable contact piece, which can be brought into and out of engagement with one another in a switching chamber, the switching chamber being connected to an expansion space on the one hand via a blowing nozzle which is closed by the movable contact piece in the switched-on position and on the other hand via a non-return valve opening towards the switching chamber is connected to the pressure side of a pump cylinder arranged in a stationary manner in the expansion space, to which a movable pump piston is assigned, which during "a switch-off stroke pressurizes the pump cylinder with a time delay.

Ein solcher Druckgasschalter ist beispielsweise aus der DE-A-27 50 762 (Fig. 2) bekannt. Bei diesem bekannten Schalter wird die an sich erwünschte zeitliche Verzögerung des eigentlichen Pumphubes des Pumpkolbens dadurch erreicht, dass das bewegliche Kontaktstück bzw. dessen Schaltstange über eine federbelastete Schleppverbindung an den Pumpkolben gekoppelt ist, so dass bei einem Ausschalthub der Pumpkolben erst dann seinen Pumphub beginnt, wenn das bewegliche Kontaktstück bzw. dessen Schaltstange einen durch die Art der Schleppverbindung bestimmten Teil des Ausschalthubes zurückgelegt hat. Die zeitliche Verzögerung des Pumphubes ist deswegen erwünscht, weil Löschgas unter Druck zur Beblasung des entstehenden Schaltlichtbogens nicht gleich zu Beginn des Ausschalthubes erforderlich ist, so dass die zur Ausführung des Pumphubes vom Schalterantrieb aufzubringende Leistung zunächst voll zur Beschleunigung der beweglichen Bestandteile des Schalters aus der Einschaltstellung heraus zur Verfügung steht.Such a pressure gas switch is known for example from DE-A-27 50 762 (Fig. 2). In this known switch, the desired time delay of the actual pump stroke of the pump piston is achieved in that the movable contact piece or its switching rod is coupled to the pump piston via a spring-loaded drag connection, so that the pump piston only begins its pump stroke when the pump is switched off. when the movable contact piece or its switching rod has covered a part of the switch-off stroke determined by the type of towing connection. The time delay of the pump stroke is desirable because quenching gas under pressure to blow the resulting switching arc is not necessary at the beginning of the switch-off stroke, so that the power to be carried out by the switch drive to carry out the pump stroke is initially fully to accelerate the moving parts of the switch from the switch-on position out is available.

Beim bekannten Schalter ist demnach der Pumpkolben in bezug auf das bewegliche Kontaktstück bzw. dessen Schaltstange beschränkt beweglich und darüber hinaus hat der Antrieb zu Beginn des Ausschalthubes noch die Kraft der in der Schleppverbindung vorgesehenen Feder zu überwinden. Wenn aber aus irgend einem Grunde (sei es wegen mangelnder Schmierung oder wegen Festsitzens infolge Anlagerung von Abriebpartikeln) die Beweglichkeit des Pumpkolbens in bezug auf das bewegliche Kontaktstück nicht mehr voll gewähr- . leistet ist, d.h. wenn die Schleppverbindung nicht mehr oder nur noch zögernd funktioniert, dann beginnt der Pumphub beim bekannten Schalter zu Beginn des Ausschalthubes, also zu früh, wozu die Leistung des Schalterantriebes gegebenenfalls nicht ausreicht.In the known switch, the pump piston is therefore limitedly movable with respect to the movable contact piece or its switching rod and, moreover, the drive at the beginning of the switch-off stroke still has to overcome the force of the spring provided in the towing connection. However, if for any reason (be it due to insufficient lubrication or due to sticking due to the accumulation of abrasion particles) the mobility of the pump piston with respect to the movable contact piece is no longer fully guaranteed. is accomplished, i.e. If the towing connection no longer functions or only functions slowly, then the pump stroke begins at the known switch at the beginning of the switch-off stroke, that is, too early, for which the performance of the switch drive may not be sufficient.

Es ist daher als ein Zweck der Erfindung anzusehen, einen Schalter der eingangs genannten Art zu schaffen, der unter Verzicht einer Schleppverbindung dennoch Gewähr für ein zeitlich verzögertes Einsetzen des Pumphubes bietet.It is therefore to be regarded as a purpose of the invention to provide a switch of the type mentioned at the outset which, without the need for a towing connection, nevertheless provides a guarantee that the pumping stroke will be delayed.

Dieser Zweck wird beim vorgeschlagenen Druckgasschalter dadurch erreicht, dass der Pumpkolben starr mit dem beweglichen Kontaktstück verbunden ist und dass die Länge des Pumpzylinders geringer als der Schalthub des beweglichen Kontaktstückes ist, so dass der Pumpkolben im Bereich der Einschaltstellung sich ausserhalb des Pumpzylinders befindet.This purpose is achieved in the proposed pressure gas switch in that the pump piston is rigidly connected to the movable contact piece and in that the length of the pump cylinder is less than the switching stroke of the movable contact piece, so that the pump piston is in the switch-on position outside the pump cylinder.

Merkmale bevorzugter Ausführungsbeispiele sind den abhängigen Patentansprüchen zu entnehmen.Features of preferred exemplary embodiments can be found in the dependent patent claims.

Ein Ausführungsbeispiel des Erfindungsgegenstandes ist nachstehend anhand der Zeichnung näher beschrieben, wobei deren einzige Figur einen schematischen Achsialschnitt durch einen Druckgasschalter zeigt.An embodiment of the subject matter of the invention is described in more detail below with reference to the drawing, the single figure of which shows a schematic axial section through a gas pressure switch.

Der dargestellte Druckgasschalter 10 besitzt ein mit einem Löschgas, beispielsweise SFg, gefülltes, nach aussen dicht abgekapseltes Gehäuse 11 aus einem Isolierstoff, dessen Innenraum durch eine Trennwand 12 in eine Schaltkammer 13 und in einen Expansionsraum 14 unterteilt ist. In der Schaltkammer 13 ist ein ortsfester Kontakt 15 angeordnet, der durch die obere Stirnwand 16 des Gehäuses herausgeführt ist, und in dieser Stirnwand verankert ist. Der ortsfeste Kontakt 15 weist einen Kranz federnder Kontaktfinger 17 auf, denen - gehalten von einer den Kranz umgebenden, leitenden Hülse 18-ein Abbrandring 19 vorgelagert ist.The pressure gas switch 10 shown has a housing 11 made of an insulating material, which is filled with an extinguishing gas, for example SFg, and is sealed off from the outside, the interior of which is divided by a partition wall 12 into a switching chamber 13 and into an expansion space 14. A fixed contact 15 is arranged in the switching chamber 13, which is led out through the upper end wall 16 of the housing and is anchored in this end wall. The stationary contact 15 has a ring of resilient contact fingers 17, which - held by a conductive sleeve 18 surrounding the ring - has an erosion ring 19 upstream.

Ein bewegliches, stiftförmiges Kontaktstück 20 erstreckt sich - in der ausgezogen dargestellten Einschaltstellung - durch einen nabenartig in der Trennwand 12 ausgebildeten und als Blasdüse 21 wirkenden Durchlass und greift mit seinem freien Ende 22 in den Kranz der Kontaktfinger 17. Das bewegliche Kontaktstück 20 erstreckt sich koaxial durch den Expansionsraum 14 und ist an seinem unteren Ende über eine isolierende Schaltstange 23 an einen nur schematisch dargestellten Antrieb 24 gekoppelt, mit dem das bewegliche Kontaktstück 20 axial verschiebbar ist. Im Bereich seines unteren Endes ist das bewegliche Kontaktstück 20 durch einen Satz Gleitkontakte 25 geführt, die ihrerseits an einem Ring 26 befestigt sind, welcher das innere Ende eines Anschlussleiters 27 bildet. Dieser ist bei 28 dicht im Gehäuse 11 befestigt und seitlich aus diesem herausgeführt.A movable, pin-shaped contact piece 20 extends - in the pulled-out switch-on position - through a hub-like passage formed in the partition wall 12 and acting as a blowing nozzle 21 and engages with its free end 22 in the ring of contact fingers 17. The movable contact piece 20 extends coaxially through the expansion space 14 and is coupled at its lower end via an isolating switch rod 23 to a drive 24, only shown schematically, with which the movable contact piece 20 is axially displaceable. In the area of its lower end, the movable contact piece 20 is guided through a set of sliding contacts 25, which in turn are fastened to a ring 26 which forms the inner end of a connecting conductor 27. This is fastened tightly at 28 in the housing 11 and led out laterally from this.

Im Expansionsraum 17 ist - beispielsweise durch radiale Streben 29 bezüglich des Gehäuses 11 ortsfest gehaltert - ein Pumpzylinder 30 angeordnet. Im Boden 31 des Pumpzylinders 30 ist ein nur schematisch angegebenes Ansaugventil 32 sowie ein federbelastetes, nach aussen hin öffnendes Ueberdruckventil 33 eingebaut. Ferner ist im Boden 31 eine mit Dichtungen versehene Durchlassbohrung 34 für das bewegliche Kontaktstück 20 vorgesehen. Von dem an den Boden 31 angrenzenden Teil der Seitenwand des Pumpzylinders 30 geht eine Druckleitung 35 aus, die durch die Trennwand 12 hindurch in die Schaltkammer 13 führt, und die an ihrem Ende mit einem zur Schaltkammer 13 hin öffnenden Rückschlagventil 36 versehen ist.A pump cylinder 30 is arranged in the expansion space 17, for example by means of radial struts 29 with respect to the housing 11. In the bottom 31 of the pump cylinder 30 there is installed a suction valve 32, which is only shown schematically, and a spring-loaded pressure valve 33 which opens outwards. Furthermore, a through bore 34 provided with seals is provided in the bottom 31 for the movable contact piece 20. From the part of the side wall of the pump cylinder adjoining the base 31 30 goes out a pressure line 35, which leads through the partition 12 into the switching chamber 13, and which is provided at its end with a check valve 36 opening towards the switching chamber 13.

Am beweglichen Kontaktstück 20 ist ein Pumpkolben 37 fest verankert, der sich in Einschaltstellung ausserhalb des mit einer Ansenkung 38 versehenen Pumpzylinders 30 befindet. Erst in der punktiert angegebenen Momentanlage des beweglichen Kontaktstückes 20 (entspricht etwa der minimalen Löschdistanz) fährt der Pumpkolben 37 in den Pumpzylinder 30 ein und verdrängt dann das dort befindliche Löschgas bis die gestrichelt angegebene Ausschaltstellung erreicht ist.A pump piston 37 is firmly anchored to the movable contact piece 20 and is in the switched-on position outside the pump cylinder 30 provided with a countersink 38. Only when the momentary system of the movable contact piece 20 is dotted (corresponds approximately to the minimum extinguishing distance) does the pump piston 37 move into the pump cylinder 30 and then displace the extinguishing gas there until the switch position indicated by the dashed line is reached.

Das ortsfeste Kontaktstück 15 und die Blasdüse 21 sind von einem Hohlzylinder 39 umgeben. Dessen gegenüber seinen Basislinien etwas zurückversetzten, ringförmigen Stirnwände 40, 41 sind an der Aussenseite der Hülse 18 bzw. der Blasdüse 21 befestigt. Somit unterteilt dieser Hohlzylinder 39 mit seinen Stirnwänden 40, 41 die Schaltkammer 13 in einen eigentlichen, die Schaltstrecke unmittelbar enthaltenden Lichtbogenraum 42 und in einen Druckspeicherraum 43 mit einem grösseren Rauminhalt.The stationary contact piece 15 and the blowing nozzle 21 are surrounded by a hollow cylinder 39. Its annular end walls 40, 41, which are set back somewhat from its base lines, are fastened to the outside of the sleeve 18 or the blowing nozzle 21. This hollow cylinder 39 thus divides the switching chamber 13 with its end walls 40, 41 into an actual arc space 42 which directly contains the switching path and into a pressure storage space 43 with a larger volume.

In der Stirnwand 40 sind federbelastete Ueberdruckventile 44 eingebaut, die zum Druckspeicherraum 43 hin öffnen, während in der Stirnwand 41 zum Lichtbogenraum 42 hin öffnende Rückschlagventile 45 eingebaut sind.Spring-loaded pressure relief valves 44 are installed in the end wall 40, which open towards the pressure accumulator space 43, while non-return valves 45 opening towards the arc chamber 42 are installed in the end wall 41.

Zur Funktionsweise des dargestellten Schalters:

  • Bei einem Ausschalthub wird das bewegliche Kontaktstück 20 von der in der Zeichnung ausgezogen dargestellten Stellung in die gestrichelt angegebene Stellung bewegt. Die Beblasung des zwischen dem freien Ende 22 und dem Abbrandring 19 gezogenen Lichtbogens erfolgt nun je nach abzuschaltenden Stromstärken durch verschiedene Löschgasmengen.
How the illustrated switch works:
  • In the event of a switch-off stroke, the movable contact piece 20 is moved from the position shown in solid lines in the drawing to the position shown in dashed lines. The arc drawn between the free end 22 and the erosion ring 19 is then blown by different extinguishing gas quantities, depending on the amperages to be switched off.

Bei kleinen Stromstärken und mithin wenig intensiven Schaltlichtbögen ergeben diese im Lichtbogenraum 42 eine vergleichsweise bescheidene Druckerhöhung, die nicht ausreicht, um die Ueberdruckventile 44 zum Ansprechen zu bringen. Sobald die Blasdüse 21 durch das nach unten sich bewegende Kontaktstück 20 freigegeben wird, wird dieser Schaltlichtbogen zunächst durch das im Lichtbogenraum 42 unter erhöhten Druck gesetzte Löschgas beblasen, wozu dann gegen Ende des Ausschalthubes noch das frische, aus dem Pumpzylinder 30 über die Druckleitung 35 in den Druckspeicherraum 42 verdrängte Löschgas hinzukommt, das die Rückschlagventile 36 und 45 öffnet.At low currents and therefore less intense switching arcs, these result in a comparatively modest pressure increase in the arc space 42, which is not sufficient to cause the pressure relief valves 44 to respond. As soon as the blowing nozzle 21 is released by the downwardly moving contact piece 20, this switching arc is first blown by the quenching gas put under increased pressure in the arc chamber 42, for which purpose the fresh one from the pump cylinder 30 via the pressure line 35 in at the end of the switch-off stroke the extinguishing gas which displaces the pressure accumulator space 42 and which opens the check valves 36 and 45.

Bei mittleren Stromstärken ist der Druckanstieg im Lichtbogenraum 42 grösser, so dass ein Teil dieses höher komprimierten Löschgases aus dem Lichtbogenraum 42 durch die Ueberdruckventile 44 nach oben in den Druckspeicherraum 42 entweicht. Dadurch erfährt auch der gesamte Druckspeicherraum ein Druckerhöhung, wobei sich aber in seinem unteren Bereich noch frisches, unverseuchtes Löschgas befindet. Sobald nun das bewegliche Kontaktstück 20 die Blasdüse 21 freigibt, entlädt sich der Druck aus dem Lichtbogenraum 42 sofort durch die Blasdüse 21, und sozusagen gleichzeitig öffnen die Rückschlagventile 45, wodurch praktisch frisches Löschgas aus dem Druckspeicherraum 43 nachströmt und ebenfalls den Schaltlichtbogen bebläst. Noch bevor das aus dem Pumpzylinder 30 verdrängte Löschgas hinzukommt.At medium current strengths, the pressure increase in the arc space 42 is greater, so that a part of this higher compressed quenching gas escapes from the arc space 42 through the pressure relief valves 44 upwards into the pressure storage space 42. As a result, the entire pressure storage space also experiences an increase in pressure, but there is still fresh, uncontaminated extinguishing gas in its lower region. As soon as the movable contact piece 20 releases the blowing nozzle 21, the pressure from the arc chamber 42 is immediately discharged through the blowing nozzle 21, and the check valves 45 open simultaneously, so to speak, so that practically fresh extinguishing gas flows in from the pressure storage chamber 43 and also blows the switching arc. Even before the extinguishing gas displaced from the pump cylinder 30 is added.

Bei noch höheren Stromstärken erfolgt die Beblasung des Schaltlichtbogens auf ähnliche Art und Weise, wobei indessen das aus dem Pumpzylinder verdrängte Löschgas etwas später zum Zuge kommt, weil der erhöhte Druck im Druckspeicherraum 43 zunächst noch das Rückschlagventil 36 geschlossen hält. Um in diesem Falle keinen allzu hohen Druck im Pumpzylinder 30 entstehen zu lassen - was einer Ueberbelastung des Antriebes 24 gleichkommen könnte - ist das Ueberdruckventil 33 vorgesehen, das öffnet, solange der Druck im Druckspeicherraum 43 noch höher ist als der Druck im Pumpzylinder 30 (wodurch das Rückschlagsventil 36 noch geschlossen bleibt), welcher seinerseits ausreichend hoch ist, um die Federkraft des Ueberdruckventiles 33 zu überwinden.At even higher currents, the switching arc is blown in a similar manner, the extinguishing gas displaced from the pump cylinder being used somewhat later, however, because the increased pressure in the pressure storage space 43 initially still keeps the check valve 36 closed. In order not to allow too high a pressure to arise in the pump cylinder 30 in this case - which could be equivalent to overloading the drive 24 - the pressure relief valve 33 is provided, which opens as long as the pressure in the pressure storage space 43 is still higher than the pressure in the pump cylinder 30 (as a result the check valve 36 remains closed), which in turn is sufficiently high to overcome the spring force of the pressure relief valve 33.

Claims (9)

1.. Gas-blast switch having a stationary and a movable contact (15, 20, respectively), which are engageable and disengageable in a switching chamber (13), the switching chamber (13) being connected on one hand with an expansion chamber (14) via a blast nozzle (21) closed in "on"-position by the movable contact (20) and on the other hand via a non-return valve (36) opening towards the switching chamber (13) with the pressure side of a pump cylinder (30) stationarily arranged in the expansion chamber (14), the pump cylinder (30) having associated thereto a movable pump piston (37) which at an opening stroke sets the pump cylinder (30) under pressure with a time delay, characterized in that the pump piston (37) is fixedly secured to the movable contact (20) and in that the length of the pump cylinder (30) is smaller than the switching stroke of the movable contact, so that the pump piston (37) in the range of the "on"-position is located outside the pump cylinder (30).
2. Gas-blast switch according to claim 1, characterized in that a spring-loaded excess pressure valve (33) opening towards the expansion chamber (14) issues from the pressure chamber of the pump cylinder (30).
3. Gas-blast switch according to claim 2, characterized in that the excess pressure valve (33) is mounted at the pump cylinder (30).
4. Gas-blast switch according to claim 1, characterized in that the length of idle stroke through which the pump piston (37) moves from the "on"-position until entering the pump cylinder (30) during an opening stroke corresponds approximately to a minimum arc extinguishing distance.
5. Gas-blast switch according to claim 1, characterized in that the switching chamber (13) is subdivided by a wall (39, 40, 41) surrounding the stationary contact (15) and the blast nozzle (21) in an arc chamber (42) and a pressure storage chamber (43), the pressure side of the pump cylinder (30) being connected to the pressure storage chamber (43), which in turn is connected to the arc chamber (42) via at least one spring-loaded excess pressure valve (44) opening towards the pressure storage chamber (43) and via at least one spring-loaded non-return valve (45) opening towards the arc chamber (42).
6. Gas-blast switch according to claim 5, characterized in that the spring-loading of the excess pressure valve (44) opening towards the pressure storage chamber (43) is different than the spring-loading of the non-return valve (45) opening towards the arc chamber (42).
7. Gas-blast switch according to claim 6, characterized in that spring-loading of the non-return valve (45) opening towards the arc chamber (42) is smaller than the spring-loading of the excess pressure valve (44) opening towards the pressure storage chamber (43).
8. Gas-blast switch according to claim 5, characterized in that the volume of the arc chamber (43) is smaller than that of the pressure storage chamber (43).
9. Gas-blast switch according to claim 1, characterized in that the distance of the pump cylinder (30) from the closing location in the blast nozzle (21) is smaller than the distance of the pump piston (37) from the free end (22) of the movable contact (20).
EP80101206A 1980-03-10 1980-03-10 Gas-blast circuit breaker Expired EP0035581B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT80101206T ATE5358T1 (en) 1980-03-10 1980-03-10 GAS SWITCH.
DE8080101206T DE3065575D1 (en) 1980-03-10 1980-03-10 Gas-blast circuit breaker
EP80101206A EP0035581B1 (en) 1980-03-10 1980-03-10 Gas-blast circuit breaker
US06/183,428 US4368367A (en) 1980-03-10 1980-09-02 Gas-blast switch
CA000361795A CA1148594A (en) 1980-03-10 1980-10-08 Gas-blast switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80101206A EP0035581B1 (en) 1980-03-10 1980-03-10 Gas-blast circuit breaker

Publications (2)

Publication Number Publication Date
EP0035581A1 EP0035581A1 (en) 1981-09-16
EP0035581B1 true EP0035581B1 (en) 1983-11-16

Family

ID=8186624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101206A Expired EP0035581B1 (en) 1980-03-10 1980-03-10 Gas-blast circuit breaker

Country Status (5)

Country Link
US (1) US4368367A (en)
EP (1) EP0035581B1 (en)
AT (1) ATE5358T1 (en)
CA (1) CA1148594A (en)
DE (1) DE3065575D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3405122A1 (en) * 1984-02-14 1985-09-05 Karl Pfisterer Elektrotechnische Spezialartikel Gmbh & Co Kg, 7000 Stuttgart Load circuit breaker or power circuit breaker for medium-voltage networks

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2519470A1 (en) * 1982-01-05 1983-07-08 Alsthom Atlantique COMPRESSED GAS CIRCUIT BREAKER
FR2558299B1 (en) * 1984-01-13 1987-03-20 Alsthom Atlantique HIGH VOLTAGE CIRCUIT BREAKER WITH ARC BLOWING
DE3412824A1 (en) * 1984-04-05 1985-10-17 Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim ELECTRIC LOAD SWITCH, ESPECIALLY FOR USE IN MEDIUM VOLTAGE SWITCHGEAR
DE3437707A1 (en) * 1984-09-20 1986-03-27 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau EXHAUST GAS SWITCH
FR2750822A1 (en) * 1996-07-03 1998-01-09 Philips Electronics Nv METHOD FOR DISPLAYING A VGA IMAGE ON A TELEVISION

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Publication number Priority date Publication date Assignee Title
US2055312A (en) * 1933-08-19 1936-09-22 Ruppel Sigwart Switch
GB516532A (en) * 1938-06-22 1940-01-04 Reyrolle A & Co Ltd Improvements in or relating to electric circuit-breaking devices of the gas-blast type
US2459599A (en) * 1944-09-20 1949-01-18 Westinghouse Electric Corp Circuit interrupter
US2957063A (en) * 1958-03-07 1960-10-18 Westinghouse Electric Corp Pumped-gas circuit interrupter
DE2710051A1 (en) * 1976-06-24 1978-01-05 Sprecher & Schuh Ag PRESSURE GAS SWITCH
FR2373141A1 (en) * 1976-12-06 1978-06-30 Cem Comp Electro Mec HIGH VOLTAGE ELECTRICAL CUT-OFF DEVICE, IN PARTICULAR A SELF-BLOWING CIRCUIT BREAKER BY GAS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3405122A1 (en) * 1984-02-14 1985-09-05 Karl Pfisterer Elektrotechnische Spezialartikel Gmbh & Co Kg, 7000 Stuttgart Load circuit breaker or power circuit breaker for medium-voltage networks

Also Published As

Publication number Publication date
CA1148594A (en) 1983-06-21
US4368367A (en) 1983-01-11
ATE5358T1 (en) 1983-12-15
EP0035581A1 (en) 1981-09-16
DE3065575D1 (en) 1983-12-22

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