EP0146671B1 - Compressed gas circuit breaker - Google Patents

Compressed gas circuit breaker Download PDF

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Publication number
EP0146671B1
EP0146671B1 EP84106283A EP84106283A EP0146671B1 EP 0146671 B1 EP0146671 B1 EP 0146671B1 EP 84106283 A EP84106283 A EP 84106283A EP 84106283 A EP84106283 A EP 84106283A EP 0146671 B1 EP0146671 B1 EP 0146671B1
Authority
EP
European Patent Office
Prior art keywords
piston
contact member
pump chamber
gas
outlet
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
EP84106283A
Other languages
German (de)
French (fr)
Other versions
EP0146671A1 (en
Inventor
Hans-Jörg Schötzau
Renzo Coccioni
Christian Sturzenegger
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.)
General Electric Switzerland GmbH
Original Assignee
Sprecher Energie 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 Energie AG filed Critical Sprecher Energie AG
Priority to AT84106283T priority Critical patent/ATE32286T1/en
Publication of EP0146671A1 publication Critical patent/EP0146671A1/en
Application granted granted Critical
Publication of EP0146671B1 publication Critical patent/EP0146671B1/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
    • 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
    • H01H33/905—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 the compression volume being formed by a movable cylinder and a semi-mobile piston

Definitions

  • the invention relates to a gas pressure switch of the type mentioned in the preamble of claim 1.
  • Such a pressure gas switch is known from DE-A-3009 165, Fig. 1 and the associated description.
  • the outlet in the movable contact piece, to which the blowing nozzle is assigned is already connected to the blow-out space during a switch-off stroke if the distance between the contact pieces between which the switching arc burns corresponds approximately to the minimum extinguishing distance.
  • the pressure surge generated by the switching arc which propagated through the outlet into the pump chamber before the minimum extinguishing distance between the contact pieces was reached and thus supported the blowing effect, fizzles out into the blow-out chamber.
  • the invention is based on the object of designing a switch of the type mentioned in such a way that the pressure surge emanating from the switching arc supports the blowing through the blowing nozzle almost during the entire switch-off stroke, so that in the end the switch-off stroke is reduced to a little more than the minimum extinguishing distance can be, which also reduces the work to be done by the switch drive during the switch-off stroke, which in turn can be built more easily as a result.
  • the proposed switch has the features defined in the characterizing part of patent claim 1.
  • FIG. 1 shows a first, tubular, movable contact piece 11, to which a cylinder 13 is connected via webs 12, the outlet between the webs 12 of which is at the same time the inlet of one attached to the bottom of the cylinder 13 and the free one with a burn-off ring 14 provided end of the contact piece 11 surrounding blowing nozzle 15 forms.
  • the narrowest point 16 of this blowing nozzle which is made of a plastic or another insulating material, is located in front of the erosion ring 14.
  • the contact piece 11 slidably passes through a piston 17 to which a guide sleeve 18 which tightly surrounds the contact piece 11 is fastened or molded.
  • the piston 17 and the cylinder 13 thus delimit a pump chamber 19 which also contains extinguishing gas.
  • the first contact piece 11 is not tubular over its entire length, but only in the section 20 adjoining the erosion ring 14. At the end of this section there are radial outlets 21 which connect the interior of the section 20 with the respective surroundings of the contact piece 11.
  • a second, fixed contact piece 22 interacts, the free end of which is also provided with an erosion ring 23 and only in the fol section 24 is tubular, at the end of this section 24 there are outlets 25 which connect the interior of section 24 with the surroundings of the contact piece 22.
  • the contact piece 22 closes the blow nozzle 15 at its narrowest point 16 and also the free end of the contact piece 11.
  • the piston 17 is stationary, e.g. supported on columns 26, while the contact piece 11 and thus also the cylinder 13 and the blowing nozzle are movable.
  • the contact piece 11 is coupled to a drive, not shown, with which the contact piece 11 can be displaced in the direction of the double arrow 27 between the on and the off position.
  • the contact piece 22 is also arranged in a stationary manner.
  • the connections 28 and 29 leading to the contact pieces 11 and 22 are indicated only schematically, the connection 28 to the movable contact pieces 11 also being provided with a sliding contact 30.
  • the volume of the pump chamber 19 in the switch-off position is still considerable, since it is still about half to a third of its original volume in the switch-on position.
  • a sufficient gas cushion always remains in the pump chamber 19, which effectively dampens the effects of the pressure peaks emanating from the switching arc on the drive.
  • the switching stroke is significantly shorter than the theoretically possible pump stroke.
  • FIG. 2 largely corresponds to that of FIG. 1 with the difference that here additional means are provided so that the pressure in the pump chamber 19 does not rise above a predetermined value.
  • these means can be formed by a pressure relief valve 32 attached to the cylinder 13 and releasing a side outlet 31 and / or by a pressure relief valve 34 attached to the piston 17 and opening a passage 33 therein. If a pressure relief valve is provided both on the cylinder 13 and on the piston 17, it is expedient to set this to approximately the same response pressure.
  • FIG. 2 Another means is shown on the right in FIG. 2 in order to limit the pressure in the pump chamber 19.
  • a protruding collar 35 is formed on the free end of the sleeve 18, which is normally sealed by an annular piston 36.
  • the annular piston 36 which is also sealing against the inner wall of the cylinder 13, is supported by a spring 37 on the piston 17, which here has a ring of outlets 38 surrounding the root of the sleeve 18. If the pressure in the pump chamber 19 is able to overcome the force of the spring 37, the annular piston 36 is displaced towards the piston 17.
  • the volume of the pump chamber in the switched-off position is still slightly more than a third of the volume in the switched-on position, so that the aforementioned damping effect of the gas cushion remaining in the pump chamber remains guaranteed.
  • FIG. 3 can to a certain extent be viewed as a kinematic reversal of the embodiment of FIG. 1.
  • the contact piece 11 and with it the cylinder 13 and the blowing nozzle 15 are supported in a stationary manner by means not shown in detail.
  • the columns 26 carrying the piston 17 are coupled to the switch drive, which thus moves the piston 17 in the direction of the double arrow 27 between the switch-on and switch-off positions.
  • the contact piece 22 is fixedly coupled to the columns 26 and thus to the drive by means of arms 39, pulling and pushing rods 40 protruding therefrom made of an insulating material and arms 41 projecting laterally from the columns 26.
  • the mode of operation of this embodiment largely corresponds to FIG. 1, but it should be noted that in this embodiment it is possible to keep the masses of the parts of the switch to be accelerated and moved by the drive smaller than in the embodiment of FIG. 1, which in turn allows the drive line to be reduced. 3, the pump chamber 19 still maintains a considerable volume in the switched-off position.
  • FIG. 4 largely corresponds to that of FIG. 3 with the difference that this embodiment is equipped with the means for limiting the pressure in the pump chamber 19, as described on the right with reference to FIG. 2.
  • the ring piston 36 has been displaced against the action of the spring 37 by the collar 35 on the sleeve 18, so that via the annular gap between the inner diameter of the annular piston 36 and the neck of the sleeve 18 and via the outlets 38 in the piston 17, the pump chamber 19 with the rest Space is connected.
  • FIG. 5 corresponds essentially to that of FIG. 4.
  • the means that are provided here for limiting the pressure in the pump chamber are - similar to the one on the left in FIG. 2 - those attached to the cylinder 13 and / or the piston 17 Pressure relief valves 32 and 34, which in turn open the outlet 31 in the cylinder wall and the outlet 33 in the piston 17.
  • FIG. 6 is the same as that of FIGS. 4 and 5, but the contact piece 22, which is movable here, and the piston 17, which is also movable here, are coupled to one and the same drive unit, but each via different linkages, such as are shown in FIGS. 7 to 9 are shown.
  • FIGS. 7 to 9 show the components which are only shown schematically, but with the same reference numerals as in FIG. 6.
  • a drive unit 43 which is arranged outside a switch housing 42 which is indicated by dashed lines.
  • a pivot lever 44 extends from this drive unit 43.
  • one end of a rod 46 is articulated at 45, which is inserted sealingly but displaceably into the housing 42 and at its other end carries the columns 26 on which the piston 17 is anchored.
  • the rod 46 associated with the piston 17 is under the action of a compression spring 47 tensioned in the switch-on position shown in FIG. 7, which strives to have the rod 46 and thus also the piston 17 perform the movement required for a switch-off stroke.
  • the contact piece 22 is connected via a bracket 48 to the one end of a further rod 49 which is essentially parallel to the rod 46.
  • the rod 49 is also under the action of a compression spring tensioned in FIG. 7 and is sealingly but displaceably guided out of the housing 42.
  • the rod 49 is provided with an elongated hole 51 into which a pin 52 anchored at the end of the pivoting lever 44 engages.
  • a locking tooth 53 is attached to the rod 49, which interacts with the one arm of a two-armed pawl 55 pivotably mounted at 54. The other arm of this pawl 55 extends near the rod 46 to which a trigger stop 56 is attached.
  • the swivel lever 44 rotates counterclockwise, as indicated by the arrow in FIG. 8. This initially moves only the rod 46 and with it the piston 17, as a result of which the extinguishing gas located in the pump chamber 19 undergoes pre-compression. Meanwhile, the rod 49 and thus also the movable contact piece remains locked by the pawl 55 and the pin 52 slides in the elongated hole 51 in the direction of the locking tooth 53. As soon as the position in FIG. 8 is reached, the trigger stop 56 on the rod 46 rises the arm of the locking blade 55 pointing towards this, which is thus pivoted clockwise until the other arm of the locking pawl 55 releases the locking tooth 53 on the rod 49.
  • the compression spring 50 can relax unhindered, the rod 49 and thus the contact piece 22 even hurry ahead of the movement of the pivoting lever 44: the switch-off stroke is in full swing while the piston 17 has practically reached its end position.
  • the switch-off position is shown in Fig. 9.
  • the pin 52 is again - as in Fig. 7 - at the end of the elongated hole 51.
  • the switch-on stroke then takes place, in which the swivel lever 44 rotates clockwise. Both rods 46 and 49 are pulled out of the housing at the same time, the compression springs 47 and 50 are tensioned simultaneously and the locking tooth 53 passes over the associated arm of the pawl 55 until the position in FIG. 7 is reached again.
  • additional means can be provided to keep the pressure in the pump chamber 19 limited.

Landscapes

  • Circuit Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

A movable and a stationary contact element are tubularly structured for the purpose of axially discharging arc gases. A blast nozzle is associated in a fixed reference position with respect to one of the contact elements. A narrowest location or throat of the blast nozzle is positioned forwardly of the end of this one contact element and is closed by the other contact element in the cut-on position of the gas-blast switch. An inlet of the blast nozzle communicates with a pump space bounded by a cylinder and a piston. The contact element with which the blast nozzle is associated displaceably extends through the piston. The pump space can be pressurized during a cut-off stroke. Both of the contact elements are provided with related outlets in their related regions which are remote from the free ends of the contact elements. At least in the cut-off position the outlets interconnect an interior space formed in the related contact element and a blow-out space. In order to utilize the pressure pulses occurring due to a switching arc, for supporting the pressure prevailing in the pump space, the outlet of the contact element, with which the blast nozzle is associated, opens into the pump space in the cut-on position and the distance of this outlet from the free end of the related contact element is greater than the pumping stroke between the piston and the cylinder which occurs during the cut-off stroke.

Description

Die Erfindung betrifft einen Druckgasschalter der im Oberbegriff des Anspruches 1 genannten Art.The invention relates to a gas pressure switch of the type mentioned in the preamble of claim 1.

Ein solcher Druckgasschalter ist aus der DE-A-3009 165, Fig. 1 und der zugehörigen Beschreibung bekannt. Bei diesem Schalter ist der Auslass im beweglichen Kontaktstück, dem die Blasdüse zugeordnet ist, bei einem Ausschalthub bereits dann mit dem Ausblasraum in Verbindung, wenn der Abstand zwischen den Kontaktstücken, zwischen denen der Schaltlichtbogen brennt, etwa der minimalen Löschdistanz entspricht. Sobald aber dieser Auslass nicht mehr in den Pumpraum mündet, verpufft der vom Schaltlichtbogen erzeugte Druckstoss, der sich vor Erreichen der minimalen Löschdistanz zwischen den Kontaktstücken noch über den Auslass in den Pumpraum fortpflanzte und damit die Blaswirkung unterstützte, nutzlos in den Ausblasraum. Daraus ergibt sich, dass wegen der nur ungenügenden Ausnützung des vom Schaltlichtbogens ausgehenden Druckstosses beim bekannten Schalter die Pumpleistung ein bestimmte Mindestmass nicht unterschreiten durfte, und dies wurde (schon aus Antriebsgründen) damit erreicht, dass der Pumphub (und nicht die «Bohrung») und damit der Schalthub vergleichsweise gross gewählt wurden, so dass am Ende des Schalthubes der Pumpraum nur noch ein vernachlässigbares Restvolumen aufwies.Such a pressure gas switch is known from DE-A-3009 165, Fig. 1 and the associated description. With this switch, the outlet in the movable contact piece, to which the blowing nozzle is assigned, is already connected to the blow-out space during a switch-off stroke if the distance between the contact pieces between which the switching arc burns corresponds approximately to the minimum extinguishing distance. However, as soon as this outlet no longer opens into the pump chamber, the pressure surge generated by the switching arc, which propagated through the outlet into the pump chamber before the minimum extinguishing distance between the contact pieces was reached and thus supported the blowing effect, fizzles out into the blow-out chamber. This means that due to the insufficient use of the pressure surge emanating from the switching arc in the known switch, the pump output was not allowed to fall below a certain minimum, and this was achieved (for drive reasons alone) by the pump stroke (and not the «bore») and so that the switching stroke was chosen to be comparatively large, so that at the end of the switching stroke the pump chamber only had a negligible residual volume.

Einer vollen Ausnützung des vom Schaltlichtbogen ausgehenden Druckstosses zur Unterstützung der Axialbeblasung des ersteren stand beim bekannten Schalter auch die Befürchtung entgegen, dass wenn zuviel Bogengase über die Blasdüse direkt in den Pumpraum zurückgedrückt würden, das dort noch vorhandene Löschgas übermässig «verseucht» und momentan in seinen Löscheigenschaften beeinträchtigt würde. Man hat daher im bekannten Schalter im Einlassbereich der Blasdüse, also in der direkten Verbindung Pumpraum/Blasdüse, Ventilzungen eingebaut, die ein Zurückfliessen der durch den Schaltlichtbogen erhitzten Gase direkt in den Pumpraum hemmen sollen, dagegen das Ausfliessen von Löschgas aus dem Pumpraum zur Blasdüse kaum hemmen.A full exploitation of the pressure surge emanating from the switching arc to support the axial blowing of the former was also opposed to the fear in the known switch that if too much arc gases were pressed back directly into the pump chamber via the blowing nozzle, the extinguishing gas still present there would be excessively "contaminated" and currently in its Extinguishing properties would be affected. One has therefore installed valve tongues in the known switch in the inlet area of the blowing nozzle, i.e. in the direct connection between the pump chamber and the blowing nozzle, which should prevent the gases heated by the switching arc from flowing back directly into the pump chamber, but hardly the extinguishing gas from the pump chamber to the blowing nozzle inhibit.

Zusammenfassend ist zu sagen, dass mit dem bekannten Druckgasschalter die angestrebte Schaltleistung mit einem relativ langen Schalthub und mit vergleichsweise kompliziertem technischen Aufwand erreicht wurde.In summary, it can be said that with the known pressure gas switch the desired switching capacity was achieved with a relatively long switching stroke and with a comparatively complicated technical effort.

Es wurde nun überraschend gefunden, dass eine grosszügigere Bemessung des Pumpraumes gestattet, den vom Schaltlichtbogen bei einem Ausschalthub erzeugten Druckstoss zeitlich länger auszunützen, ohne dass die Schaltleistung wegen der oben angegebenen «Verseuchungsgefahr» beeinträchtigt würde. Dementsprechend ist der Erfindung die Aufgabe zugrunde gelegt, einen Schalter der eingangs genannten Art derart auszugestalten, dass der vom Schaltlichtbogen ausgehende Druckstoss fast während des ganzen Ausschalthubes die Beblasung durch die Blasdüse unterstützt, so dass letzten Endes der Ausschalthub auf etwas mehr als die minimale Löschdistanz vermindert werden kann, was auch die beim Ausschalthub vom Schalterantrieb aufzuwendende Arbeit vermindert, welcher seinerseits dadurch leichter gebaut werden kann.It has now surprisingly been found that a more generous dimensioning of the pump chamber allows the pressure surge generated by the switching arc during a switch-off stroke to be used for a longer period of time without the switching capacity being impaired because of the “risk of contamination” specified above. Accordingly, the invention is based on the object of designing a switch of the type mentioned in such a way that the pressure surge emanating from the switching arc supports the blowing through the blowing nozzle almost during the entire switch-off stroke, so that in the end the switch-off stroke is reduced to a little more than the minimum extinguishing distance can be, which also reduces the work to be done by the switch drive during the switch-off stroke, which in turn can be built more easily as a result.

Zur Lösung dieser Aufgabe weist der vorgeschlagene Schalter die im Kennzeichen des Patentanspruches 1 definierten Merkmale auf.To solve this problem, the proposed switch has the features defined in the characterizing part of patent claim 1.

Bevorzugte Ausführungsformen sind in den abhängigen Ansprüchen definiert.Preferred embodiments are defined in the dependent claims.

Die Erfindung ist nachfolgend rein beispielsweise anhand der Zeichnung näher erläutert, wobei zu bemerken ist, dass in den Schnittzeichnungen nur die in vorliegendem Zusammenhang wesentlichen Teile links jeweils in Einschaltstellung rechts dagegen in Ausschaltstellung dargestellt sind. Es zeigt:

  • Fig. 1 sehr schematisch einen Schnitt durch Teile einer einfachen Ausführungsform eines Druckgasschalters,
  • Fig. 2 in ähnlicher Darstellung wie Fig. 1 einen Schnitt durch eine zweite Ausführungsform, bei dem zusätzliche Mittel vorgesehen sind, um den Druck im Pumpraum begrenzt zu halten,
  • Fig. 3 einen schematischen Schnitt durch eine weitere Ausführungsform,
  • Fig. 4 und 5 Schnitte durch die Ausführung der Fig. 3 bei denen zusätzlich Mittel vorgesehen sind, um den Druck im Pumpraum begrenzt zu halten,
  • Fig. 6 einen Schnitt durch eine Ausführungsform, bei der, ausgehend von demselben Schalterantrieb, das bewegliche Kontaktstück erst bewegt wird, wenn im Pumpraum bereits eine Vorkompression stattgefunden hat, und
  • Fig. 7 bis 9 rein schematisch eine beispielsweise Koppelung des beweglichen Kontaktstückes, einerseits und der Pumpenbetätigung andererseits beim Schalter der Fig. 6 an einen Schalterantrieb.
The invention is explained in more detail below purely by way of example with reference to the drawing, it being noted that only the parts essential in the present context are shown on the left in the switched-on position and on the right in the switched-off position in the sectional drawings. It shows:
  • 1 very schematically a section through parts of a simple embodiment of a gas pressure switch,
  • 2 shows a section similar to FIG. 1 through a second embodiment, in which additional means are provided to keep the pressure in the pump chamber limited,
  • 3 shows a schematic section through a further embodiment,
  • 4 and 5 sections through the embodiment of Fig. 3 in which additional means are provided to keep the pressure in the pump chamber limited,
  • 6 shows a section through an embodiment in which, starting from the same switch drive, the movable contact piece is only moved when pre-compression has already taken place in the pump chamber, and
  • 7 to 9 purely schematically, for example coupling the movable contact piece, on the one hand, and the pump actuation, on the other hand, in the switch of FIG. 6 to a switch drive.

Die in Fig. 1 dargestellten Teile eines Druckgasschalters 10 muss man sich als in einem nicht dargestellten, gekapselten und ein Löschgas, z.B. SF6, unter Überdruck enthaltenden Gehäuse angeordnet vorstellen. Man erkennt in Fig. 1 ein erstes, rohrförmiges, bewegliches Kontaktstück 11, mit dem über Stege 12 ein Zylinder 13 verbunden ist, dessen zwischen den Stegen 12 vorhandener Auslass zugleich den Einlass einer am Boden des Zylinders 13 befestigten und das freie, mit einem Abbrandring 14 versehene Ende des Kontaktstückes 11 umgebenden Blasdüse 15 bildet. Die engste Stelle 16 dieser aus einem Kunststoff oder einem anderen isolierenden Material bestehenden Blasdüse ist dem Abbrandring 14 vorgelagert. Das Kontaktstück 11 durchsetzt auf verschiebbare Weise einen Kolben 17, an dem eine das Kontaktstück 11 dicht umschliessende Führungshülse 18 befestigt oder angeformt ist. Der Kolben 17 und der Zylinder 13 begrenzen somit einen Pumpraum 19, der ebenfalls Löschgas enthält.The parts of a compressed gas switch 10 shown in FIG. 1 must be thought of as being arranged in an encapsulated housing (not shown) and containing an extinguishing gas, for example SF 6 , under excess pressure. 1 shows a first, tubular, movable contact piece 11, to which a cylinder 13 is connected via webs 12, the outlet between the webs 12 of which is at the same time the inlet of one attached to the bottom of the cylinder 13 and the free one with a burn-off ring 14 provided end of the contact piece 11 surrounding blowing nozzle 15 forms. The narrowest point 16 of this blowing nozzle, which is made of a plastic or another insulating material, is located in front of the erosion ring 14. The contact piece 11 slidably passes through a piston 17 to which a guide sleeve 18 which tightly surrounds the contact piece 11 is fastened or molded. The piston 17 and the cylinder 13 thus delimit a pump chamber 19 which also contains extinguishing gas.

Das erste Kontaktstück 11 ist nicht über seine gesamte Länge rohrförmig, sondern nur in dem an den Abbrandring 14 anschliessenden Abschnitt 20. Am Ende dieses Abschnittes sind radiale Auslässe 21 vorhanden, die den Innenraum des Abschnittes 20 mit der jeweiligen Umgebung des Kontaktstückes 11 verbinden.The first contact piece 11 is not tubular over its entire length, but only in the section 20 adjoining the erosion ring 14. At the end of this section there are radial outlets 21 which connect the interior of the section 20 with the respective surroundings of the contact piece 11.

Mit dem ersten, beweglichen Kontaktstück 11 wirkt ein zweites, festes Kontaktstück 22 zusammen, dessen freies Ende ebenfalls mit einem Abbrandring 23 versehen und nur in dem auf diesen folgenden Abschnitt 24 rohrförmig ist, wobei am Ende dieses Abschnittes 24 Auslässe 25 vorhanden sind, die den Innenraum des Abschnittes 24 mit der Umgebung des Kontaktstückes 22 verbinden. In der Einschaltstellung verschliesst das Kontaktstück 22 die Blasdüse 15 an deren engsten Stelle 16 und auch das freie Ende des Kontaktstückes 11.With the first, movable contact piece 11, a second, fixed contact piece 22 interacts, the free end of which is also provided with an erosion ring 23 and only in the fol section 24 is tubular, at the end of this section 24 there are outlets 25 which connect the interior of section 24 with the surroundings of the contact piece 22. In the switched-on position, the contact piece 22 closes the blow nozzle 15 at its narrowest point 16 and also the free end of the contact piece 11.

Bei der in Fig. 1 dargestellten Ausführungsform ist der Kolben 17 ortsfest, z.B. auf Säulen 26 abgestützt, während das Kontaktstück 11 und mithin auch der Zylinder 13 und die Blasdüse beweglich sind. Zu diesem Zweck ist das Kontaktstück 11 an einen nicht dargestellten Antrieb gekoppelt, mit welchem das Kontaktstück 11 im Sinne des Doppelpfeiles 27 zwischen der Ein- und der Ausschaltstellung verschiebbar ist. Wie der Kolben 17 ist auch das Kontaktstück 22 ortsfest angeordnet. Nur schematisch sind die zu den Kontaktstücken 11 bzw. 22 führenden Anschlüsse 28 bzw. 29 angegeben, wobei der Anschluss 28 an das bewegliche Kontaktstücke 11 noch mit einem Gleitkontakt 30 versehen ist.In the embodiment shown in Fig. 1, the piston 17 is stationary, e.g. supported on columns 26, while the contact piece 11 and thus also the cylinder 13 and the blowing nozzle are movable. For this purpose, the contact piece 11 is coupled to a drive, not shown, with which the contact piece 11 can be displaced in the direction of the double arrow 27 between the on and the off position. Like the piston 17, the contact piece 22 is also arranged in a stationary manner. The connections 28 and 29 leading to the contact pieces 11 and 22 are indicated only schematically, the connection 28 to the movable contact pieces 11 also being provided with a sliding contact 30.

Bei einem Ausschalthub entfernt sich das Kontaktstück 11 vom Kontaktstück 22. Bevor die beiden Kontaktstücke jedoch sich gegenseitig verlassen, wird das im Pumpraum 19 befindliche Löschgas bereits etwas vorkomprimiert. Sobald sich die beiden Kontaktstücke trennen, wird ein Schaltlichtbogen gezogen, dessen Intensität von der Stärke des abgeschalteten Stromes abhängt. Dieser Schaltlichtbogen wird nun beblasen, auch wenn die Blasdüse noch durch das Kontaktstück 22 verschlossen ist. Die entstehenden Schaltgase strömen dann zur Hauptsache axial über die Auslässe 25 im Kontaktstück 22 ab. Ist aber der Schaltlichtbogen besonders intensiv, so dass der Druck der hochgespannten Schaltgase den Druck des vorkomprimierten Löschgases im Pumpraum übersteigt, so breitet sich eine Druckwelle durch den Abschnitt 20 und die Auslässe 21 aus und erhöht zusätzlich den bereits vorhandenen Druck im Pumpraum 19. Sobald die Blasdüse 15 das Kontaktstück 22 verlässt, wird die Beblasung des Schaltlichtbogens schlagartig intensiver, zumal dann die Druckunterstützung über die Auslässe 21 noch anhält, bis diese in die Führungshülse 18 eintreten und dadurch verschlossen werden. In diesem Moment hört die axiale Strömung im Abschnitt 20 vorübergehend auf und es bildet sich, je nach Intensität des Schaltlichtbogens, in diesem Abschnitt 20 ein Druckstau. Dieser entlädt sich dann, wenn die Auslässe 21 gegen Ende des Ausschalthubes wieder aus der Führungshülse 18 austreten.During a switch-off stroke, the contact piece 11 moves away from the contact piece 22. Before the two contact pieces leave each other, however, the extinguishing gas in the pump chamber 19 is already somewhat pre-compressed. As soon as the two contact pieces separate, a switching arc is drawn, the intensity of which depends on the strength of the switched-off current. This switching arc is now blown, even if the blowing nozzle is still closed by the contact piece 22. The resulting switching gases then flow mainly axially through the outlets 25 in the contact piece 22. However, if the switching arc is particularly intense, so that the pressure of the high-voltage switching gases exceeds the pressure of the precompressed quenching gas in the pump chamber, a pressure wave propagates through section 20 and outlets 21 and additionally increases the pressure already present in pump chamber 19. As soon as the Blowing nozzle 15 leaves the contact piece 22, the blowing of the switching arc suddenly becomes more intense, especially since the pressure support via the outlets 21 then continues until they enter the guide sleeve 18 and are thereby closed. At this moment, the axial flow temporarily stops in section 20 and, depending on the intensity of the switching arc, a pressure build-up forms in this section 20. This then discharges when the outlets 21 emerge again from the guide sleeve 18 towards the end of the switch-off stroke.

Zu beachten ist, dass der Rauminhalt des Pumpraumes 19 in Ausschaltstellung noch immer beachtlich ist, beträgt er doch noch etwa die Hälfte bis ein Drittel seines ursprünglichen Rauminhaltes in Einschaltstellung. Dadurch verbleibt im Pumpraum 19 stets ein ausreichendes Gaskissen, das die Rückwirkungen der vom Schaltlichtbogen ausgehenden Druckspitzen auf den Antrieb wirksam dämpft. Mit anderen Worten ist der Schalthub bedeutend kürzer als der an sich theoretisch mögliche Pumphub.It should be noted that the volume of the pump chamber 19 in the switch-off position is still considerable, since it is still about half to a third of its original volume in the switch-on position. As a result, a sufficient gas cushion always remains in the pump chamber 19, which effectively dampens the effects of the pressure peaks emanating from the switching arc on the drive. In other words, the switching stroke is significantly shorter than the theoretically possible pump stroke.

Die Ausführungsform der Fig. 2 entspricht weitgehend jener der Fig. 1 mit dem Unterschied, dass hier zusätzlich Mittel vorgesehen sind, um den Druck im Pumpraum 19 nicht über einen vorbestimmten Wert ansteigen zu lassen.The embodiment of FIG. 2 largely corresponds to that of FIG. 1 with the difference that here additional means are provided so that the pressure in the pump chamber 19 does not rise above a predetermined value.

Wie in Fig. 2 links zu erkennen ist, können diese Mittel durch ein an den Zylinder 13 angebautes und einen seitlichen Auslass 31 freigebendes Überdruckventil 32 und/oder durch ein am Kolben 17 angebautes, einen Durchlass 33 in diesem freigebendes Überdruckventil 34 gebildet sein. Falls sowohl am Zylinder 13 als auch am Kolben 17 ein Überdruckventil vorgesehen ist, ist es zweckmässig, diese auf etwa denselben Ansprechdruck einzustellen.As can be seen in FIG. 2 on the left, these means can be formed by a pressure relief valve 32 attached to the cylinder 13 and releasing a side outlet 31 and / or by a pressure relief valve 34 attached to the piston 17 and opening a passage 33 therein. If a pressure relief valve is provided both on the cylinder 13 and on the piston 17, it is expedient to set this to approximately the same response pressure.

In Fig. 2 rechts ist ein anderes Mittel dargestellt, um den Druck im Pumpraum 19 zu begrenzen. Hier ist am freien Ende der Hülse 18 ein abstehender Bund 35 angeformt, der normalerweise dichtend von einem Ringkolben 36 umschlossen ist. Der ebenfalls dichtend an der Innenwand des Zylinders 13 anliegende Ringkolben 36 ist über eine Feder 37 auf den Kolben 17 abgestützt, der hier einen die Wurzel der Hülse 18 umgebenden Kranz von Auslässen 38 aufweist. Vermag der Druck im Pumpraum 19 die Kraft der Feder 37 zu überwinden, wird der Ringkolben 36 auf den Kolben 17 hin verdrängt. Damit verlässt er auch den Bund 35 und zwischen der Hülse 18 und dem Innendurchmesser des Ringkolbens 36 entsteht ein Ringspalt, durch den der Überdruck im Pumpraum entweichen kann, bis die Feder 37 wieder den Ringkolben 36 auf die Höhe des Bundes 35 zu drücken vermag.Another means is shown on the right in FIG. 2 in order to limit the pressure in the pump chamber 19. Here, a protruding collar 35 is formed on the free end of the sleeve 18, which is normally sealed by an annular piston 36. The annular piston 36, which is also sealing against the inner wall of the cylinder 13, is supported by a spring 37 on the piston 17, which here has a ring of outlets 38 surrounding the root of the sleeve 18. If the pressure in the pump chamber 19 is able to overcome the force of the spring 37, the annular piston 36 is displaced towards the piston 17. He also leaves the collar 35 and between the sleeve 18 and the inner diameter of the annular piston 36, an annular gap is created through which the excess pressure in the pump chamber can escape until the spring 37 is able to push the annular piston 36 back to the height of the collar 35.

Auch bei der in Fig. 2 rechts gezeigten Ausführungsform beträgt der Rauminhalt des Pumpraumes in Ausschaltstellung noch etwas mehr als ein Drittel des Rauminhaltes in Einschaltstellung, so dass die erwähnte dämpfende Wirkung des im Pumpraum verbleibenden Gaskissens gewährleistet bleibt.In the embodiment shown on the right in FIG. 2, the volume of the pump chamber in the switched-off position is still slightly more than a third of the volume in the switched-on position, so that the aforementioned damping effect of the gas cushion remaining in the pump chamber remains guaranteed.

Die Ausführungsform der Fig. 3 kann gewissermassen als kinematische Umkehrung der Ausführungsform der Fig. 1 angesehen werden. Hier ist das Kontaktstück 11 und mit ihm der Zylinder 13 sowie die Blasdüse 15 durch nicht näher dargestellte Mittel ortsfest abgestützt.The embodiment of FIG. 3 can to a certain extent be viewed as a kinematic reversal of the embodiment of FIG. 1. Here the contact piece 11 and with it the cylinder 13 and the blowing nozzle 15 are supported in a stationary manner by means not shown in detail.

Dagegen sind die den Kolben 17 tragenden Säulen 26 an den Schalterantrieb gekoppelt, der somit den Kolben 17 im Sinne des Doppelpfeiles 27 zwischen der Einschalt- und der Ausschaltstellung bewegt. Das Kontaktstück 22 ist über von diesem abstehende Ausleger 39, Zug- und Schubstangen 40 aus einem Isoliermaterial sowie von den Säulen 26 seitlich abstehende Ausleger 41 fest an die Säulen 26 und damit an den Antrieb gekoppelt. Die Wirkungsweise dieser Ausführungsform entspricht weitgehend der Fig. 1, doch ist zu bemerken, dass es bei dieser Ausführungsform möglich ist, die Massen der vom Antrieb zu beschleunigenden und zu bewegenden Teile des Schalters geringer als bei der Ausführungsform der Fig. 1 gehalten werden kann, was wiederum gestattet, die Leitung des Antriebes zu verringern. Auch in Fig. 3 behält der Pumpraum 19 in Ausschaltstellung noch einen erheblichen Rauminhalt bei.In contrast, the columns 26 carrying the piston 17 are coupled to the switch drive, which thus moves the piston 17 in the direction of the double arrow 27 between the switch-on and switch-off positions. The contact piece 22 is fixedly coupled to the columns 26 and thus to the drive by means of arms 39, pulling and pushing rods 40 protruding therefrom made of an insulating material and arms 41 projecting laterally from the columns 26. The mode of operation of this embodiment largely corresponds to FIG. 1, but it should be noted that in this embodiment it is possible to keep the masses of the parts of the switch to be accelerated and moved by the drive smaller than in the embodiment of FIG. 1, which in turn allows the drive line to be reduced. 3, the pump chamber 19 still maintains a considerable volume in the switched-off position.

Die Ausführungsform der Fig. 4 entspricht weitgehend jener der Fig. 3 mit dem Unterschied, dass diese Ausführungsform mit den Mitteln zum Begrenzen des Druckes im Pumpraum 19 ausgestattet ist, wie sie anhand der Fig. 2 rechts beschrieben worden sind. Man erkennt rechts in Fig. 4 wie der Ringkolben 36 gegen die Wirkung der Feder 37 vom Bund 35 an der Hülse 18 verdrängt worden ist, so dass über den Ringspalt zwischen dem Innendurchmesser des Ringkolbens 36 und dem Hals der Hülse 18 und über die Auslässe 38 im Kolben 17 der Pumpraum 19 mit dem übrigen Raum verbunden ist.The embodiment of FIG. 4 largely corresponds to that of FIG. 3 with the difference that this embodiment is equipped with the means for limiting the pressure in the pump chamber 19, as described on the right with reference to FIG. 2. One can see on the right in Fig. 4 how the ring piston 36 has been displaced against the action of the spring 37 by the collar 35 on the sleeve 18, so that via the annular gap between the inner diameter of the annular piston 36 and the neck of the sleeve 18 and via the outlets 38 in the piston 17, the pump chamber 19 with the rest Space is connected.

Die Ausführungsform der Fig. 5 entspricht im wesentlichen jener der Fig. 4. Die Mittel, die hier zur Begrenzung des Druckes im Pumpraum vorgesehen sind, sind - ähnlich wie in Fig. 2 links - die am Zylinder 13 und/oder am Kolben 17 angebauten Überdruckventile 32 bzw. 34, die ihrerseits den Auslass 31 in der Zylinderwand bzw. den Auslass 33 im Kolben 17 freigeben.The embodiment of FIG. 5 corresponds essentially to that of FIG. 4. The means that are provided here for limiting the pressure in the pump chamber are - similar to the one on the left in FIG. 2 - those attached to the cylinder 13 and / or the piston 17 Pressure relief valves 32 and 34, which in turn open the outlet 31 in the cylinder wall and the outlet 33 in the piston 17.

Die Ausführungsform der Fig. 6 gleicht jenen der Fig. 4 und 5, doch sind das hier bewegliche Kontaktstück 22 und der hier ebenfalls bewegliche Kolben 17 zwar an ein und dieselbe Antriebseinheit gekoppelt, jedoch je über verschiedene Gestänge, wie sie beispielsweise in den Fig. 7 bis 9 dargestellt sind.The embodiment of FIG. 6 is the same as that of FIGS. 4 and 5, but the contact piece 22, which is movable here, and the piston 17, which is also movable here, are coupled to one and the same drive unit, but each via different linkages, such as are shown in FIGS. 7 to 9 are shown.

Man erkennt in den Fig. 7 bis 9 die nur schematisch dargestellten, jedoch mit denselben Bezugsziffern wie in Fig. 6 bezeichneten Bestandteile. Ausserdem erkennt man eine ausserhalb eines hier gestrichelt angedeuteten Schaltergehäuses 42 angeordnete Antriebseinheit 43. Von dieser Antriebseinheit 43 geht ein Schwenkhebel 44 aus. An diesen Schwenkhebel 44 ist bei 45 das eine Ende einer Stange 46 angelenkt, die dichtend, jedoch verschiebbar in das Gehäuse 42 eingeführt ist und an ihrem anderen Ende die Säulen 26 trägt, auf denen der Kolben 17 verankert ist. Die mithin dem Kolben 17 zugeordnete Stange 46 steht unter der Wirkung einer in der Fig. 7 gezeigten Einschaltstellung gespannten Druckfeder 47, die bestrebt ist, die Stange 46 und damit auch den Kolben 17 zur Ausführung der bei einem Ausschalthub erforderlichen Bewegung durchführen zu lassen.FIGS. 7 to 9 show the components which are only shown schematically, but with the same reference numerals as in FIG. 6. In addition, one can see a drive unit 43 which is arranged outside a switch housing 42 which is indicated by dashed lines. A pivot lever 44 extends from this drive unit 43. At this pivot lever 44, one end of a rod 46 is articulated at 45, which is inserted sealingly but displaceably into the housing 42 and at its other end carries the columns 26 on which the piston 17 is anchored. The rod 46 associated with the piston 17 is under the action of a compression spring 47 tensioned in the switch-on position shown in FIG. 7, which strives to have the rod 46 and thus also the piston 17 perform the movement required for a switch-off stroke.

Das Kontaktstück 22 ist über einen Ausleger 48 mit dem einen Ende einer weiteren, zur Stange 46 im wesentlichen parallelen Stange 49 verbunden. Auch die Stange 49 steht unter der Wirkung einer in Fig. 7 gespannten Druckfeder und ist dichtend, jedoch verschiebbar aus dem Gehäuse 42 herausgeführt. An ihrem ausserhalb des Gehäuses 42 liegenden Ende ist die Stange 49 mit einem Langloch 51 versehen, in das ein am Ende des Schwenkhebels 44 verankerter Zapfen 52 greift. Ausserdem ist an der Stange 49 ein Sperrzahn 53 befestigt, der mit dem einen Arm einer zweiarmigen, bei 54 schwenkbar gelagerten Sperrklinke 55 zusammenwirkt. Der andere Arm dieser Sperrklinke 55 erstreckt sich in die Nähe der Stange 46, an der ein Auslöseanschlag 56 befestigt ist.The contact piece 22 is connected via a bracket 48 to the one end of a further rod 49 which is essentially parallel to the rod 46. The rod 49 is also under the action of a compression spring tensioned in FIG. 7 and is sealingly but displaceably guided out of the housing 42. At its end lying outside the housing 42, the rod 49 is provided with an elongated hole 51 into which a pin 52 anchored at the end of the pivoting lever 44 engages. In addition, a locking tooth 53 is attached to the rod 49, which interacts with the one arm of a two-armed pawl 55 pivotably mounted at 54. The other arm of this pawl 55 extends near the rod 46 to which a trigger stop 56 is attached.

Für einen Ausschalthub verdreht sich der Schwenkhebel 44 im Gegenuhrzeigersinn, wie mit dem Pfeil in Fig. 8 angegeben. Damit wird zunächst nur die Stange 46 und mit ihr der Kolben 17 bewegt, wodurch das im Pumpraum 19 befindliche Löschgas eine Vorkompression erfährt. Derweil bleibt die Stange 49 und damit auch das bewegliche Kontaktstück durch die Sperrklinke 55 noch arretiert und der Zapfen 52 gleitet im Langloch 51 in Richtung auf den Sperrzahn 53. Sobald die Stellung der Fig. 8 erreicht ist, hebt der Auslöseanschlag 56 an der Stange 46 den zu dieser hin weisenden Arm der Sperrklinge 55 an, die somit im Uhrzeigersinn verschwenkt wird, bis der andere Arm der Sperrklinke 55 den Sperrzahn 53 an der Stange 49 freigibt. Von diesem Moment an kann sich die Druckfeder 50 ungehindert entspannen, die Stange 49 und damit das Kontaktstück 22 eilen der Bewegung des Schwenkhebels 44 sogar vor: Der Ausschalthub ist in vollem Gange, während der Kolben 17 seine Endstellung praktisch schon erreicht hat. Die Ausschaltstellung ist in Fig. 9 dargestellt. Der Zapfen 52 liegt wieder - wie in Fig. 7 - am Ende des Langloches 51 an. Ausgehend von der in Fig. 9 dargestellten Ausschaltstellung erfolgt dann der Einschalthub, in dem der Schwenkhebel 44 eine Drehung im Uhrzeigersinn ausführt. Dabei werden beide Stangen 46 und 49 gleichzeitig aus dem Gehäuse gezogen, die Druckfedern 47 und 50 gleichzeitig gespannt und der Sperrzahn 53 überfährt den zugeordneten Arm der Sperrklinke 55, bis die Stellung der Fig. 7 wieder erreicht ist.For a switch-off stroke, the swivel lever 44 rotates counterclockwise, as indicated by the arrow in FIG. 8. This initially moves only the rod 46 and with it the piston 17, as a result of which the extinguishing gas located in the pump chamber 19 undergoes pre-compression. Meanwhile, the rod 49 and thus also the movable contact piece remains locked by the pawl 55 and the pin 52 slides in the elongated hole 51 in the direction of the locking tooth 53. As soon as the position in FIG. 8 is reached, the trigger stop 56 on the rod 46 rises the arm of the locking blade 55 pointing towards this, which is thus pivoted clockwise until the other arm of the locking pawl 55 releases the locking tooth 53 on the rod 49. From this moment on, the compression spring 50 can relax unhindered, the rod 49 and thus the contact piece 22 even hurry ahead of the movement of the pivoting lever 44: the switch-off stroke is in full swing while the piston 17 has practically reached its end position. The switch-off position is shown in Fig. 9. The pin 52 is again - as in Fig. 7 - at the end of the elongated hole 51. Starting from the switch-off position shown in FIG. 9, the switch-on stroke then takes place, in which the swivel lever 44 rotates clockwise. Both rods 46 and 49 are pulled out of the housing at the same time, the compression springs 47 and 50 are tensioned simultaneously and the locking tooth 53 passes over the associated arm of the pawl 55 until the position in FIG. 7 is reached again.

Auch bei der Ausführungsform der Fig. 6 bzw. 7 bis 9 können zusätzlich Mittel vorgesehen sein, um den Druck im Pumpraum 19 begrenzt zu halten.Also in the embodiment of FIGS. 6 and 7 to 9, additional means can be provided to keep the pressure in the pump chamber 19 limited.

Claims (6)

1. A gas-blast switch having a movable and a fixed contact member (22 and 11) both of which are tubular in construction, wherein associated with the first contact member (11) is a blast nozzle (15) in a fixed reference position, the narrowest point (16) of which is mounted in front of this and, in the closed position, is closed by the other second contact member (22), wherein the inlet of the blast nozzle (15) is in communication with a pump chamber (19) which can be placed under pressure during an opneing stroke and which is bounded by a cylinder (13) and by a piston (17) which is penetrated in a displaceable manner by the first contact member (11) with which the blast nozzle (15) is associated and wherein the first contact member (11) associated with the blast nozzle (15) is provided, in the region remote from its free end, with an outlet (21) which connects the interior of the contact member (11) in question with a blow-out chamber, at least in the open position, wherein this outlet (21) opens into the pump chamber (19) in the closed position and the distance of which from the free end of said contact member (11) is greater than the pump lift between the piston (17) and cylinder (13) traking place during an opening stroke, characterised in that the second contact member (22) is provided with an outlet (25) in the region remote from its free end, in thatthe outlet (21) of the first contact member (11) only comes into communication with the blow-out chamber towards the end of an opening stroke and in that the volume of the pump chamber (19) in the open position corresponds to half to a third of its volume in the closed position.
2. A gas-blast switch according to Patent claim 1, characterised in that means (32; 35, 36, 37, 38) are provided to limit the pressure in the pump chamber (19).
3. A gas-blast switch according to Patent claim 2, characterised in that the means are formed by at least one pressure-relief valve (32; 36-38) which, at a predetermined excess pressure prevailing in the pump chamber (19), connects the pump chamber to the blow-out chamber.
4. A gas-blast switch according to Patent claim 1, characterised in that the piston (17) is provided with a sleeve (18) which closely surrounds the first contact member (11) penetrating through it and which temporarily closes the outlet (21) present in this first contact member (11) on leaving the pump chamber (19).
5. A gas-blast switch according to Patent claims 3 and 4, characterised in that the pressure-relief valve comprises a further, annular piston (36) which is resiliently supported on the side of the first-mentioned piston (17) adjacent to the pump chamber and is displaceable on the sleeve (18) which is anchored on this and which comprises, in the region of its free end, a collar (35) bearing tightly against the internal diameter of the further piston (36), the first-mentioned piston (17) comprising a passage (38) leading into the blow-out chamber and, when the further piston (36) responds, an annular gap, through which flow is possible, results between this piston and the sleeve.
6. A gas-blast switch according to any one of the preceding Patent claims, characterised in that means (51, 52, 53, 54, 55, 56) are provided to place the pump chamber (19) under pressure before the movement of the movable contact member (22) during an opening stroke (Figures 7 - 9).
EP84106283A 1983-11-15 1984-06-01 Compressed gas circuit breaker Expired EP0146671B1 (en)

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AT84106283T ATE32286T1 (en) 1983-11-15 1984-06-01 GAS SWITCH.

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CH6128/83 1983-11-15
CH612883 1983-11-15

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EP0146671A1 EP0146671A1 (en) 1985-07-03
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JP (1) JPS60119040A (en)
AT (1) ATE32286T1 (en)
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ATE32286T1 (en) 1988-02-15
US4598188A (en) 1986-07-01
JPH0574896B2 (en) 1993-10-19
JPS60119040A (en) 1985-06-26
EP0146671A1 (en) 1985-07-03
DE3469098D1 (en) 1988-03-03

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