EP0374384B1 - Single-pressure switch with SF6 - Google Patents

Single-pressure switch with SF6 Download PDF

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Publication number
EP0374384B1
EP0374384B1 EP89117724A EP89117724A EP0374384B1 EP 0374384 B1 EP0374384 B1 EP 0374384B1 EP 89117724 A EP89117724 A EP 89117724A EP 89117724 A EP89117724 A EP 89117724A EP 0374384 B1 EP0374384 B1 EP 0374384B1
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EP
European Patent Office
Prior art keywords
opening
compression
switching
switch
drive rod
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 - Lifetime
Application number
EP89117724A
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German (de)
French (fr)
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EP0374384A3 (en
EP0374384A2 (en
Inventor
Herbert Dr.-Ing. Karrenbauer
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Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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Priority claimed from DE19883843406 external-priority patent/DE3843406A1/en
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of EP0374384A2 publication Critical patent/EP0374384A2/en
Publication of EP0374384A3 publication Critical patent/EP0374384A3/en
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Publication of EP0374384B1 publication Critical patent/EP0374384B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/901—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism making use of the energy of the arc or an auxiliary arc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H2033/908—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism using valves for regulating communication between, e.g. arc space, hot volume, compression volume, surrounding volume

Definitions

  • the application relates to a SF6 indentation switch with a switching chamber filled with insulating gas, at least two switching elements, at least one of which is movable by a drive rod, a compression device for the insulating gas which can be actuated by this switching movement and whose compression space is delimited by two opposite floors which can be moved relative to one another, described, in which a pressure chamber is arranged between the insulating material nozzle and the bottom facing it, which has an outflow opening that can be closed by a non-return valve in the direction of the switching path, and an inflow opening that can be closed by means of a closing element is arranged in the bottom and a gas storage space connected to the switching path is up to extends to an opening which can be closed by means of the closure element and which opens into the part of the pressure chamber which faces away from the outflow opening, the opening element being in a first position Inflow opening is opened and the opening is closed and in a second position of the closure member the inflow opening is closed and the opening is open and the change in position
  • the invention is therefore based on the object of improving the switch mentioned at the outset in such a way that blowing with cold insulating gas of high density is ensured in all conceivable switching situations.
  • the drive rod is axially displaceable to a limited extent relative to the floor and the pressure chamber, that a ventilation opening is arranged with a valve between the compression chamber and the pressure, that the displacement of the drive rod relative to the floor when the switch is turned on Opening of the valve causes and that the check valve is held in the open position when the switch is turned on.
  • the advantage of the invention is that the compression device sucks in the gas in the pressure chamber each time it is switched on, as a result of which cold quenching gas is sucked in from the switching chamber surrounding the arc quenching device through the nozzle opening.
  • the hot, low-density gas remaining in the pressure chamber after the interruption of a short-circuit current is sucked into the compression device in this way by the subsequent switch-on process, and the cold extinguishing gas flowing in is provided in the pressure chamber for re-blowing the arc.
  • a further advantageous embodiment provides that the opening connecting the gas storage space to the pressure chamber is closed when it is switched on, so that the flow of the fresh gas drawn in is not distributed over the pressure chamber and gas storage space, but rather only and more intensely through the pressure chamber because it is renewed Switching off depends on the fact that there is cold, high-density extinguishing gas and that maximum cooling has been achieved.
  • Fig. 1 shows a first embodiment, the SF6 impression switch is shown in a partial view, in which the essential parts are shown by means of a section extending to the axis of rotation.
  • This exemplary embodiment contains the parts that are customary in an SF6 impression switch: 2 switching pieces 20 and 21, which form a switching path 4 when the switch is opened. Of these contact pieces, one contact piece 20 is fixed and the other contact piece 21 can be brought from the switch-on to the switch-off position (and vice versa) by means of a drive rod 19 by means of a drive rod.
  • the arc 23 which arises in the switching path 4 when it is switched off is blown by means of a compression device.
  • an insulating gas stream is directed by means of an insulating material nozzle 12 onto the arc 23 burning in the switching path 4.
  • This compression device as is usual with SF6 indentation switches, consists of a compression cylinder 17 and two trays 1 and 2, which move towards one another when switched off and thus compress the insulating gas in a compression space 11.
  • the compression cylinder 17 is connected as a fixed part to the base 2 and the base 1 with the switching piece 21 perform the switching movement by means of the drive rod 19, the base 1 being drawn into the compression cylinder 17.
  • a pressure chamber 3 is located between the base 1 and the insulating material nozzle 12 and a gas storage space 9 is separated therefrom by a partition 25.
  • the pressure chamber 3 is provided in the direction of the switching path 4 with an outflow opening 5, in which an insulating gas heated by the arc flows in a check valve 6 is prevented.
  • the check valve 6 closes only against the force of a spring 31, the spring contacts of which are dimensioned such that the check valve 6 closes in the event of a gas pressure wave resulting from high-current arcs, but remains open when gas is drawn into the compression space 11 as a result of a switch-on.
  • the gas storage space 9 has an inlet 26 in the direction of the switching path 4 and an opening 10 which opens into the pressure chamber 3 on the side opposite the outflow opening 5.
  • the bottom 1 is provided with an inflow opening 7, which connects the compression space 11 to the pressure chamber 3.
  • a closure element 8 is arranged in the region of the opening 10 and the inflow opening 7.
  • This closure member 8 is in Fig. 1 as a sliding ring with an L-shaped Cross section formed. It can assume two positions: a first position in which the axial leg of the closure element 8 is pushed in a sealing manner in front of the opening 10 and opens the inflow opening 7. In a second position, in which the closure member 8 is located in the illustration in FIG.
  • the opening 10 is opened and the inflow opening 7 is closed by the radial leg of the closure member 8. If no pressure differences act on the closure member 8, it is held by a spring 24 in this second position shown.
  • the bottom 2 is designed as a fixed component, the drive rod 19 passing through a hole in this bottom and a seal ensuring the gas tightness of this passage.
  • a vent hole 13 is arranged, which is provided with a vent valve 14, which opens against the pressure of a spring 14 '.
  • the valve 35 to 39 is configured as follows: the bottom 1, which separates the pressure chamber 3 from the compression space 11, is not fixedly connected to the drive rod 19, but is displaceably mounted on it to a small extent.
  • the drive rod 19 has an annular recess 35 which is delimited on one side by a shoulder 36 and on the other side by a snap ring 37.
  • the bottom 1 has at its bore, through which the drive rod 19 passes, a projection 38 which engages in the annular recess 35 of the drive rod 19. This projection 38 strikes the shoulder 36 in one position of the base 1 and in the other position of the base 1 this projection strikes the snap ring 37.
  • the projection 38 is designed such that it comes to a gas-tight system on the snap ring 37.
  • recesses 39 are formed in the manner of radially arranged cutouts. This creates a connection between the pressure chamber 3 and the compression space 11 in the position of the base 1, in which the projection 38 rests on the shoulder 36.
  • the wall of the pressure chamber 3, the nozzle 12 and the partition wall 25 are connected to the Bottom 1 firmly connected and thus also displaceable relative to the drive rod 19 within the limits of the recess 35.
  • the SF6 impression switch shown has the following functions:
  • the function corresponds to that known from conventional SF6 impression switches:
  • the gas is compressed by the switching movement, mediated by the drive rod 19, between the base 1 moved with the drive rod 19 and the fixed base 2 in the compression space 11, passes through the inflow opening 7 and flows through the opening 5 to the arc 23, around the latter to blow at zero crossing.
  • the quenching gas opens the closure element 8 in this way, flows through the pressure chamber 3 and, after leaving the pressure chamber 3 through the outflow opening 5, finally reaches the switching path 4 in order to blow the arc 23.
  • the outflow opening 5 is not closed by the check valve 6, since in the case of low-current arcs there is no gas pressure wave which is strong enough to close the check valve 6 against the force of the spring 31.
  • the SF6 impression switch adapts to the conditions caused by the gas expansion and uses this gas expansion to produce the required insulating gas pressure:
  • insulating gas is compressed in the compression space 11 in the manner described above, flows through the inflow opening 7 into the pressure chamber 3, the closure member 8 being opened by the gas flow.
  • the arc 23 is drawn in the switching path 4, whereby extinguishing gas expands and, as shown by the curved arrow, flows in the direction of the compression device.
  • the outflow opening 5 is closed by the check valve 6 and the pressurized gas flows into the gas storage space 9.
  • the closed check valve 6 in the pressure chamber 3 and the compression chamber 11 produce reproducible pressure conditions, so that a specific pressure can be assigned to a specific distance between the switching contacts 21 and 22.
  • the pressure in the compression space 11 drops sharply, which has the consequence that the closure member 8 moves into the position in which it closes the inflow opening 7 with its radial leg and at the same time opens the opening 10.
  • the drive is completely relieved of the pressure force in the compression space 11 by venting it, so that there is no braking of the switching movement or even a backward movement, on the contrary - the switching movement is even accelerated by the relief.
  • the drive advantageously only has to apply the energy for the pre-compression of the gas in the pressure chamber 3.
  • the expanded gas which is stored in the gas storage space 9 and thereby cooled, flows through the opening 10 into the pressure chamber 3.
  • the cold gas pre-compressed in the pressure chamber 3 is post-compressed by the gas pressure wave coming from the gas storage space 9, which cold gas of high density lies in front of the outflow opening 5 in order to serve the blowing at the moment of zero current crossing which is decisive for the extinguishing of the arc.
  • the gas pressure generated by the arc 23 decreases, the check valve 6 opens and the cold gas cushion flows out of the outflow opening 5 in the direction of the switching path 4 in order to blow the arc there. In this way, optimal extinguishing conditions were created while relieving the load on the drive.
  • the valve 35 to 39 has no function in the shutdowns: If the drive rod 19 is moved downward to shutdown, the base 1 initially remains due to the inertia of itself and the pressure chamber wall, the partition 25 and the insulating material nozzle 12, and under the effect of Frictional force of the contact 32 in its position. As a result, the projection 38 rests gas-tight on the snap ring 37 regardless of the starting position of the base 1, as a result of which the base 1 is carried along in the course of the opening movement. The gas compressed in the compression space 11 also exerts a compressive force on the base 1, which also presses the base 1 against the snap ring 37.
  • This negative pressure also results in an additional force which the Cantilever 38 pressed onto the shoulder 36. Due to the negative pressure in the compression chamber 11, the hot gas flows from the pressure chamber 3 into the compression chamber 11. This in turn creates a negative pressure in the pressure chamber 3, which leads to the pressure chamber 3 being filled with cold gas through the opening of the insulating material nozzle 12. This cold gas is supplied from the switching chamber surrounding the arc extinguishing device.
  • the spring 31 of the check valve 6 is selected with respect to its spring constant such that this suction of the cold gas cannot lead to the check valve 6 being closed.
  • the goal is achieved to fill the pressure chamber 3 with cold gas by the switch-on movement, so that cold quenching gas is provided in the pressure chamber 3 for renewed arcing.
  • arc quenching is also ensured if, after a short-circuit current has been interrupted, the circuit is switched off again, which necessitates blowing the arc with the aid of the compression device.
  • the fact that the hot gas of low density is in the compression space 11 is harmless because this gas only flows to the switching path when all the cold gas from the pressure chamber 3 has blown the arc 23. At this point in time, when the gas of lower density flows in from the compression space 11, the arc 23 has already been extinguished.
  • Fig. 2 shows a different embodiment of the floors 1 and 2 and the cylinder of the compression chamber, which as a cylinder 17 'with the bottom 1st is connected and is pulled by the switch-off movement over the bottom 2 designed as a piston.
  • the vent valve 14 is opened against the force of a spring 14 ⁇ by a pin 18.
  • the length of this pin 18 is dimensioned such that the vent valve 14 lifts the valve plate of the vent valve 14 out of its closed position when a distance between the switching pieces 20 and 21 which is sufficient for arc extinguishing is reached.
  • the spring 14 ⁇ must have a larger spring constant than the spring 14 'described in Fig. 1'.
  • the closure member 8 is also designed as an L-shaped ring, but in order to achieve better guidance, the axial leg is longer and the connection to the valve 35 to 39 is made through a bore.
  • the opening leading from the gas storage space 9 into the pressure chamber 3 has been moved upwards compared to FIG. 1 in order to insert a shoulder 47 designed as a projection of the drive rod 19.
  • the lower end 46 of the partition wall 25 was designed such that when it is switched on when the projection 38 abuts the shoulder 36, there is a gas-tight seal between the end 46 of the partition wall 25 and the shoulder 47. As a result, a closable opening 10 'is achieved.
  • the advantage of this design is that the fresh gas flow is passed completely through the pressure chamber 3, whereby a complete filling of the pressure chamber 3 with fresh gas is achieved, so that cold gas of high density is available in sufficient mass for renewed arcing and also the walls a certain amount Experience cooling.
  • the check valve 6 is also designed differently than in FIG. 1:
  • the check valve 6 has arms 34 which point in the direction of the switch axis and which, when switched on by means of a collar 33 connected to the drive rod 19, lift the check valve 6 out of its closed position.
  • This opening of the check valve 6 takes place due to the displaceability of the base 1 relative to the drive rod 19, which when switched on also leads to a relative movement of the valve seat of the check valve 6 relative to the drive rod 19 and thus the collar 33.
  • the rest of the function of the check valve 6 is not impaired and a spring is not required.
  • Fig. 2 shows the switching off of a high-current arc.
  • the straight arrow shows the switch-off movement of the drive rod 19.
  • the gas pressure wave caused by the arc 23 flows in the direction of the curved arrow with the check valve 6 closed, through the inlet 26 into the gas storage space 9 and from there, in the second one described above (FIG. 1) Phase of the switch-off, through the opening 10 'in the pressure chamber 3.
  • the dashed arrows show the backflowing of the gas from the pressure chamber 3 when the current approaches the zero crossing with a blowing of the arc 23. Since the sufficient distance to achieve an arc extinguishing between the Switch contacts 20, 21 is achieved, the pin 18 has opened the vent valve 14.
  • the arrows pointing through the ventilation hole 13 show the ventilation of the compression space 11, which leads to a relief of the drive.
  • Fig. 3 shows the embodiment of FIG. 2 when switched on.
  • the straight arrow pointing upwards shows the switch-on movement of the moving switch parts.
  • the projection 38 bears against the shoulder 36, as a result of which the pressure chamber 3 is connected to the compression space 11 via the recess 35 and the recesses 39 and the ventilation opening 30.
  • the compression space 11, which increases as a result of the activation, sucks the gas out of the pressure chamber 3, as the dashed line shows. Since the check valve 6 is open, fresh arc gas of high density flows out of the switching chamber surrounding the arc quenching device, as shown by the curved arrows Nozzle 12 and the outflow opening 5 into the pressure chamber 3.
  • the vent valve 14 is closed when it is switched on.
  • the inflow opening 7 serves as a ventilation opening for switching on.
  • the closure member 8 takes over the function of the valve, this closure member 8 being opened when switched on.
  • the base 1 is equipped with an annular projection 43 which comprises the drive rod 19.
  • This projection 43 engages in an annular groove 40 of the drive rod 19, wherein the base 1 - and the switch parts connected to it - can carry out a slight displacement in that the projection 43 has a smaller width than the groove 40.
  • the projection 43 When it is switched off the projection 43 on the Shoulder 41 of the groove 40 on.
  • the projection 43 rests on the shoulder 42.
  • the bottom 1 slides in a gastight manner on the drive rod 19.
  • a holding lug 45 is connected to the drive rod 19 and engages in a recess 44 in the closure member 8.
  • This retaining lug 45 is arranged in such a way that when it is switched on it lifts the closure member 8 out of its closed position due to the relative movement of the base 1 with respect to the drive rod 19.
  • the pressure chamber 3 is connected to the compression space 11 via the inflow opening 7.
  • the arrow through the inflow opening 7 shows the suction of the gas located in the pressure chamber 3 in the compression chamber 11.
  • the opening 10 ' is closed in the manner described above.
  • the fresh gas can flow into the pressure chamber 3 as described in FIG. 3.
  • the relative movement of the base 1 with respect to the drive rod 19 takes place, as already explained, by the inertia, the friction and the pressures.
  • Fig. 5 shows the same training when switching off a high-current arc.
  • the inflow opening 7 was closed by the fact that the pin 18 had opened the vent valve 14 (second phase of the switch-off) under the pressure of the spring 24 on the closure element 8 and the gas pressure wave flows through the opening 10 'into the pressure chamber 3.
  • the check valve 6 opens and the arc is blown.
  • FIG. 6 shows the design according to FIG. 4 when a low-current arc is switched off.
  • the compressed gas in the compression chamber 11 flows through the inflow opening 7 while opening the closure member 8 against the pressure of the spring 24 and closing the opening 10 'in the pressure chamber 3. From there this quenching gas flows through the opening of the check valve 6 to the switching path, where the arc is blown.
  • the partition 25 is formed at its lower end 46 so that it comes to rest with the closure 48, which is formed by the upper part of the vertical leg of the closure member 8, and thereby closes the opening 10 '.

Description

Die Anmeldung betrifft einen SF₆-Eindruckschalter mit einer mit Isoliergas gefüllten Schaltkammer, mindestens zwei Schaltstücken, von denen mindestens eines durch eine Antriebsstange bewegbar ist, einer durch diese Schaltbewegung betätigbaren Kompressionseinrichtung für das Isoliergas deren Kompressionsraum von zwei gegenüberliegenden, relativ zueinander bewegbaren Böden begrenzt ist, beschrieben, bei dem zwischen der Isolierstoffdüse und dem ihr zugewandten Boden eine Druckkammer angeordnet ist, welche in Richtung der Schaltstrecke eine durch ein Rückschlagventil verschliessbare Ausströmöffnung aufweist, sowie im Boden eine mittels eines Verschlussorgans verschliessbare Einströmöffnung angeordnet ist und ein mit der Schaltstrecke verbundener Gasspeicherraum sich bis zu einer mittels des Verschlussorgans verschliessbaren Öffnung erstreckt, welche in den der Ausströmöffnung abgewandten Teil der Druckkammer mündet, wobei in einer ersten Position des Verschlussorgans die Einströmöffnung geöffnet und die Öffnung verschlossen ist und in einer zweiten Position des Verschlussorgans die Einströmöffnung geschlossen und die Öffnung geöffnet ist und dabei die Positionsänderung des Verschlussorgans durch den zurückgelegten Schaltweg oder durch die auftretende Drücke steuerbar ist (vgl. EP-A-0 334 008 Dieses Dokument stellt Stand der Technik gemäß Art. 54(3) EPÜ dar.).The application relates to a SF₆ indentation switch with a switching chamber filled with insulating gas, at least two switching elements, at least one of which is movable by a drive rod, a compression device for the insulating gas which can be actuated by this switching movement and whose compression space is delimited by two opposite floors which can be moved relative to one another, described, in which a pressure chamber is arranged between the insulating material nozzle and the bottom facing it, which has an outflow opening that can be closed by a non-return valve in the direction of the switching path, and an inflow opening that can be closed by means of a closing element is arranged in the bottom and a gas storage space connected to the switching path is up to extends to an opening which can be closed by means of the closure element and which opens into the part of the pressure chamber which faces away from the outflow opening, the opening element being in a first position Inflow opening is opened and the opening is closed and in a second position of the closure member the inflow opening is closed and the opening is open and the change in position of the closure member can be controlled by the switching path covered or by the pressures occurring (cf. EP-A-0 334 008 This document represents prior art according to Art. 54 (3) EPC.).

Bei einem solchen Schalter können jedoch in bestimmten Schaltsituationen Probleme auftreten:
Bei der Ausschaltung von Kurzschlussströmen ist die Einströmöffnung durch das Verschlussorgan verschlossen und es kann in die Druckkammer kein kaltes Löschgas von dem Kompressionsraum nachströmen. Nach der Beblasung des Lichtbogens eines Kurzschlussstromes verbleibt also in der Druckkammer ein Rest heissen, ionisierten Löschgases. Erfolgt nun nach der Unterbrechung eines Kurzschlussstromes eine sofortige Wiedereinschaltung des Schalters mit einer unmittelbar danach erfolgenden Ausschaltung, so ist im Strömungskanal bzw. dem Gasspeicherraum die Dichte des Gases wesentlich vermindert, was die Fähigkeit zur erfolgreichen Beblasung des Lichtbogens entsprechend vermindert. Diese Situation tritt zwar nur ein, wenn unmittelbar nach der Unterbrechung eines Kurzschlussstromes erneut ein Strom unterbrochen werden muss, kann aber in diesem Fall dazu führen, dass der Lichtbogen nach dem Nulldurchgang des zu unterbrechenden Stromes erneut zündet. Ein Schalter muss jedoch auch in solchen Fällen eine einwandfreie Ausschaltung gewährleisten.With such a switch, however, problems can occur in certain switching situations:
When short-circuit currents are switched off, the inflow opening is closed by the closure member and no cold extinguishing gas can flow into the pressure chamber from the compression chamber. After blowing the arc of a short-circuit current, a remnant of hot, ionized quenching gas remains in the pressure chamber. Now takes place after the interruption a short-circuit current, an immediate reclosure of the switch with an immediate shutdown, the density of the gas is significantly reduced in the flow channel or the gas storage space, which correspondingly reduces the ability to successfully blow the arc. This situation only occurs if a current has to be interrupted again immediately after the interruption of a short-circuit current, but in this case can lead to the arc igniting again after the current to be interrupted has passed zero. However, a switch must also ensure that it is switched off properly in such cases.

Der Erfindung liegt daher die Aufgabe zugrunde, den eingangs genannten Schalter dahingehend zu verbessern, dass eine Beblasung mit kaltem Isoliergas hoher Dichte in allen erdenklichen Schaltsituationen gewährleistet ist.The invention is therefore based on the object of improving the switch mentioned at the outset in such a way that blowing with cold insulating gas of high density is ensured in all conceivable switching situations.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, daß die Antriebsstange gegenüber dem Boden und der Druckkammer begrenzt axial verschiebbar gelagert ist, dass zwischen dem Kompressionsraum und der Druckkammer eine Belüftungsöffnung mit einem Ventil angeordnet ist, daß die Verschiebung der Antriebsstange gegenüber dem Boden beim Einschalten des Schalters eine Öffnung des Ventils verursacht und daß das Rückschlagventil beim Einschalten des Schalters in offener Stellung gehalten wird.This object is achieved in that the drive rod is axially displaceable to a limited extent relative to the floor and the pressure chamber, that a ventilation opening is arranged with a valve between the compression chamber and the pressure, that the displacement of the drive rod relative to the floor when the switch is turned on Opening of the valve causes and that the check valve is held in the open position when the switch is turned on.

Der Vorteil der Erfindung besteht darin, dass die Kompressionseinrichtung bei jedem Einschaltvorgang das in der Druckkammer befindliche Gas ansaugt, wodurch durch die Düsenöffnung kaltes Löschgas aus der die Lichtbogenlöscheinrichtung umgebenden Schaltkammer angesaugt wird. Das nach der Unterbrechung eines Kurzschlussstromes in der Druckkammer verbleibende heisse Gas geringer Dichte wird auf diese Weise durch den nachfolgenden Einschaltvorgang in die Kompressionseinrichtung gesaugt und das nachströmende kalte Löschgas wird in der Druckkammer zur erneuten Beblasung des Lichtbogens bereitgestellt. Dass das heisse Löschgas in den Kompressionsraum angesaugt wird, ist unschädlich, da dadurch eine weitere Abkühlung dieses Löschgases erfolgt und das in die Druckkammer angesaugte kalte Löschgas als erstes zur Schaltstrecke strömt und dort die Lichtbogenlöschung bewirkt.The advantage of the invention is that the compression device sucks in the gas in the pressure chamber each time it is switched on, as a result of which cold quenching gas is sucked in from the switching chamber surrounding the arc quenching device through the nozzle opening. The hot, low-density gas remaining in the pressure chamber after the interruption of a short-circuit current is sucked into the compression device in this way by the subsequent switch-on process, and the cold extinguishing gas flowing in is provided in the pressure chamber for re-blowing the arc. It is harmless that the hot extinguishing gas is sucked into the compression chamber, since this further cools down this extinguishing gas and the cold extinguishing gas sucked into the pressure chamber flows first to the switching path and causes the arc to be extinguished there.

Weiterbildungen und zweckmässige Ausgestaltungen der Erfindung sind den Unteransprüchen zu entnehmen. Besonders vorteilhaft ist eine Weiterbildung, bei der die Öffnung des Ventils wie des Rückschlagventils unter Ausnützung von Masseträgheit, Reibungskraft und Drücken unmittelbar durch die Einschaltbewegung bewirkt wird.Further developments and expedient refinements of the invention can be found in the subclaims. A further development is particularly advantageous in which the opening of the valve and the check valve are exploited of inertia, frictional force and pressure is caused directly by the switch-on movement.

Eine weitere vorteilhafte Ausgestaltung sieht vor, dass die den Gasspeicherraum mit der Druckkammer verbindende Öffnung bei der Einschaltung verschlossen ist damit sich die Strömung des angesaugten Frischgases nicht auf Druckkammer und Gasspeicherraum verteilt, sondern nur und dafür intensiver die Druckkammer durchströmt wird, da es bei einer erneuten Ausschaltung darauf ankommt, dass sich dort kaltes Löschgas hoher Dichte befindet und eine maximale Abkühlung erzielt ist.A further advantageous embodiment provides that the opening connecting the gas storage space to the pressure chamber is closed when it is switched on, so that the flow of the fresh gas drawn in is not distributed over the pressure chamber and gas storage space, but rather only and more intensely through the pressure chamber because it is renewed Switching off depends on the fact that there is cold, high-density extinguishing gas and that maximum cooling has been achieved.

Die Erfindung wird nachstehend anhand von in der Zeichnung dargestellten Ausführungsbeispielen erläutert, wobei auf weitere Vorteile verwiesen wird.The invention is explained below with reference to exemplary embodiments shown in the drawing, reference being made to further advantages.

Es zeigen

Fig. 1
Teile eines ersten Ausführungsbeispiels, wobei sich die Darstellung auf einen Schnitt bis zur Mittellinie (Rotationsachse) beschränkt,
Fig. 2
ein weiteres Ausführungsbeispiel, wobei eine Ausschaltung dargestellt ist,
Fig. 3
das Ausführungsbeispiel der Fig. 2 bei der Einschaltung,
Fig. 4
ein drittes Ausführungsbeispiel bei der Einschaltung,
Fig. 5
das dritte Ausführungsbeispiel bei der Ausschaltung eines stromstarken Lichtbogens und
Fig. 6
das dritte Ausführungsbeispiel bei der Ausschaltung eines stromschwachen Lichtbogens.
Show it
Fig. 1
Parts of a first embodiment, the illustration being limited to a section up to the center line (axis of rotation),
Fig. 2
a further embodiment, wherein a switch-off is shown,
Fig. 3
the embodiment of FIG. 2 when switched on,
Fig. 4
a third embodiment when switching on,
Fig. 5
the third embodiment when switching off a high-current arc and
Fig. 6
the third embodiment when switching off a low-current arc.

Fig. 1 zeigt ein erstes Ausführungsbeispiels, wobei der SF₆-Eindruckschalter in einer Teilansicht dargestellt ist, bei der die wesentlichen Teile mittels eines bis zur Rotationsachse reichenden Schnitts dargestellt sind.Fig. 1 shows a first embodiment, the SF₆ impression switch is shown in a partial view, in which the essential parts are shown by means of a section extending to the axis of rotation.

Dieses Ausführungsbeispiel enthält einmal die bei einem SF₆-Eindruckschalter üblichen Teile:
2 Schaltstücke 20 und 21, welche bei der Öffnung des Schalters eine Schaltstrecke 4 bilden. Von diesen Schaltstücken ist ein Schaltstück 20 fest und das andere Schaltstück 21 mittels einer Antriebsstange 19 durch den Antrieb von der Einschalt- in eine Ausschaltstellung (sowie umgekehrt) bringbar. Der in der Schaltstrecke 4 bei der Ausschaltung entstehende Lichtbogen 23 wird mittels einer Kompressionseinrichtung beblasen. Dabei wird ein Isoliergasstrom mittels einer Isolierstoffdüse 12 gezielt auf den in der Schaltstrecke 4 brennenden Lichtbogen 23 gerichtet. Diese Kompressionseinrichtung besteht, wie bei SF₆-Eindruckschaltern üblich, aus einem Kompressionszylinder 17 und zwei Böden 1 und 2, die sich bei einer Ausschaltung aufeinander zu bewegen und so das Isoliergas in einem Kompressionsraum 11 komprimieren. Beim vorliegenden Ausführungsbeispiel ist der Kompressionszylinder 17 als feststehendes Teil mit dem Boden 2 verbunden und der Boden 1 mit dem Schaltstück 21 führen mittels der Antriebsstange 19 die Schaltbewegung aus, wobei der Boden 1 in den Kompressionszylinder 17 hingezogen wird.This exemplary embodiment contains the parts that are customary in an SF₆ impression switch:
2 switching pieces 20 and 21, which form a switching path 4 when the switch is opened. Of these contact pieces, one contact piece 20 is fixed and the other contact piece 21 can be brought from the switch-on to the switch-off position (and vice versa) by means of a drive rod 19 by means of a drive rod. The arc 23 which arises in the switching path 4 when it is switched off is blown by means of a compression device. In this case, an insulating gas stream is directed by means of an insulating material nozzle 12 onto the arc 23 burning in the switching path 4. This compression device, as is usual with SF₆ indentation switches, consists of a compression cylinder 17 and two trays 1 and 2, which move towards one another when switched off and thus compress the insulating gas in a compression space 11. In the present exemplary embodiment, the compression cylinder 17 is connected as a fixed part to the base 2 and the base 1 with the switching piece 21 perform the switching movement by means of the drive rod 19, the base 1 being drawn into the compression cylinder 17.

Der Erzielung einer besonders wirksamen Beblasung stromstarker Lichtbögen sowie einer Verhinderung der Rückwirkung der Gasexpansion auf den Antrieb dienen folgende Teile:
Zwischen dem Boden 1 und der Isolierstoffdüse 12 befindet sich eine Druckkammer 3 und davon durch eine Trennwand 25 getrennt ein Gasspeicherraum 9. Die Druckkammer 3 ist in Richtung der Schaltstrecke 4 mit einer Ausströmöffnung 5 versehen, bei der ein Einströmen von durch den Lichtbogen erhitztem Isoliergas durch ein Rückschlagventil 6 verhindert wird. Das Rückschlagventil 6 schliesst nur gegen die Kraft einer Feder 31, deren Federkontakte so bemessen ist, dass das Rückschlagventil 6 bei einer durch stromstarke Lichtbögen entstehenden Gasdruckwelle schliesst, jedoch beim Ansaugen von Gas in den Kompressionsraum 11 infolge einer Einschaltung geöffnet bleibt. Der Gasspeicherraum 9 verfügt über einen Einlass 26 in Richtung der Schaltstrecke 4 und über eine Öffnung 10, die in die Druckkammer 3 auf der der Ausströmöffnung 5 gegenüberliegenden Seite einmündet. Der Boden 1 ist mit einer Einströmöffnung 7 versehen, die den Kompressionsraum 11 mit der Druckkammer 3 verbindet. In dem Bereich der Öffnung 10 und der Einströmöffnung 7 ist ein Verschlussorgan 8 angeordnet. Dieses Verschlussorgan 8 ist in Fig. 1 als verschiebbarer Ring mit L-förmigem Querschnitt ausgebildet. Es kann zwei Positionen einnehmen: Eine erste Position in der der axiale Schenkel des Verschlussorgans 8 dichtend vor die Öffnung 10 geschoben ist und die Einströmöffnung 7 freigibt. In einer zweiten Position, in welcher sich das Verschlussorgan 8 in der Darstellung der Fig. 1 befindet, ist die Öffnung 10 freigegeben und die Einströmöffnung 7 durch den radialen Schenkel des Verschlussorgans 8 verschlossen. Wenn keine Druckunterschiede auf das Verschlussorgan 8 einwirken, wird es von einer Feder 24 in dieser zweiten, dargestellten Position gehalten. Der Boden 2 ist als feststehendes Bauteil ausgebildet, wobei die Antriebsstange 19 durch eine Bohrung dieses Bodens hindurchtritt und eine Dichtung für die Gasdichtheit dieses Durchtritts sorgt. Im Boden 2 ist eine Entlüftungsbohrung 13 angeordnet, welche mit einem Entlüftungsventil 14 versehen ist, das gegen den Druck einer Feder 14′ öffnet.The following parts serve to achieve a particularly effective blowing of high-current arcs and to prevent the reaction of gas expansion to the drive:
A pressure chamber 3 is located between the base 1 and the insulating material nozzle 12 and a gas storage space 9 is separated therefrom by a partition 25. The pressure chamber 3 is provided in the direction of the switching path 4 with an outflow opening 5, in which an insulating gas heated by the arc flows in a check valve 6 is prevented. The check valve 6 closes only against the force of a spring 31, the spring contacts of which are dimensioned such that the check valve 6 closes in the event of a gas pressure wave resulting from high-current arcs, but remains open when gas is drawn into the compression space 11 as a result of a switch-on. The gas storage space 9 has an inlet 26 in the direction of the switching path 4 and an opening 10 which opens into the pressure chamber 3 on the side opposite the outflow opening 5. The bottom 1 is provided with an inflow opening 7, which connects the compression space 11 to the pressure chamber 3. A closure element 8 is arranged in the region of the opening 10 and the inflow opening 7. This closure member 8 is in Fig. 1 as a sliding ring with an L-shaped Cross section formed. It can assume two positions: a first position in which the axial leg of the closure element 8 is pushed in a sealing manner in front of the opening 10 and opens the inflow opening 7. In a second position, in which the closure member 8 is located in the illustration in FIG. 1, the opening 10 is opened and the inflow opening 7 is closed by the radial leg of the closure member 8. If no pressure differences act on the closure member 8, it is held by a spring 24 in this second position shown. The bottom 2 is designed as a fixed component, the drive rod 19 passing through a hole in this bottom and a seal ensuring the gas tightness of this passage. In the bottom 2, a vent hole 13 is arranged, which is provided with a vent valve 14, which opens against the pressure of a spring 14 '.

Zwischen der Druckkammer 3 und dem Kompressionsraum 11 befindet sich eine Belüftungsöffnung 30, welche durch ein Ventil 35 bis 39 verschliessbar ist. Das Ventil 35 bis 39 ist folgendermassen ausgestaltet: Der Boden 1, welcher die Druckkammer 3 von dem Kompressionsraum 11 trennt, ist nicht fest mit der Antriebsstange 19 verbunden, sondern auf dieser in geringfügigem Masse verschiebbar gelagert. Die Antriebsstange 19 weist eine ringförmige Ausnehmung 35 auf, welche auf der einen Seite durch eine Schulter 36 und auf der anderen Seite durch eine Sprengring 37 begrenzt ist. Der Boden 1 weist an seiner Bohrung, durch welche die Antriebsstange 19 hindurchführt, eine Auskragung 38 auf, die in die ringförmige Ausnehmung 35 der Antriebsstange 19 eingreift. Diese Auskragung 38 schlägt in einer Position des Bodens 1 an die Schulter 36 an und in der anderen Position des Bodens 1 schlägt diese Auskragung an den Sprengring 37 an. Die Auskragung 38 ist so ausgebildet, dass sie an dem Sprengring 37 zu einer gasdichten Anlage kommt. An der der Schulter 36 zugewandten Seite der Auskragung 38 sind Ausnehmungen 39 in der Art radial angeordneter Ausfräsungen eingeformt. Dadurch entsteht in der Position des Bodens 1, in der die Auskragung 38 an der Schulter 36 anliegt, eine Verbindung zwischen der Druckkammer 3 und dem Kompressionsraum 11. Bei diesem Schalter sind die Wandung der Druckkammer 3, die Düse 12 sowie die Trennwand 25 mit dem Boden 1 fest verbunden und dadurch ebenfalls gegenüber der Antriebsstange 19 innerhalb der Begrenzungen der Ausnehmung 35 verschiebbar.Between the pressure chamber 3 and the compression space 11 there is a ventilation opening 30 which can be closed by a valve 35 to 39. The valve 35 to 39 is configured as follows: the bottom 1, which separates the pressure chamber 3 from the compression space 11, is not fixedly connected to the drive rod 19, but is displaceably mounted on it to a small extent. The drive rod 19 has an annular recess 35 which is delimited on one side by a shoulder 36 and on the other side by a snap ring 37. The bottom 1 has at its bore, through which the drive rod 19 passes, a projection 38 which engages in the annular recess 35 of the drive rod 19. This projection 38 strikes the shoulder 36 in one position of the base 1 and in the other position of the base 1 this projection strikes the snap ring 37. The projection 38 is designed such that it comes to a gas-tight system on the snap ring 37. On the side of the projection 38 facing the shoulder 36, recesses 39 are formed in the manner of radially arranged cutouts. This creates a connection between the pressure chamber 3 and the compression space 11 in the position of the base 1, in which the projection 38 rests on the shoulder 36. In this switch, the wall of the pressure chamber 3, the nozzle 12 and the partition wall 25 are connected to the Bottom 1 firmly connected and thus also displaceable relative to the drive rod 19 within the limits of the recess 35.

Der dargestellte SF₆-Eindruckschalter weist folgende Funktionen auf:The SF₆ impression switch shown has the following functions:

Bei der Abschaltung schwacher Ströme entspricht die Funktion der aus herkömmlichen SF₆-Eindruckschaltern bekannten:
Das Gas wird durch die Schaltbewegung, vermittelt durch die Antriebsstange 19, zwischen dem mit der Antriebsstange 19 bewegten Boden 1 und dem feststehenden Boden 2 im Kompressionsraum 11 komprimiert, tritt durch die Einströmöffnung 7 hindurch und strömt über die Öffnung 5 zum Lichtbogen 23, um diesen im Nulldurchgang zu beblasen.When switching off low currents, the function corresponds to that known from conventional SF₆ impression switches:
The gas is compressed by the switching movement, mediated by the drive rod 19, between the base 1 moved with the drive rod 19 and the fixed base 2 in the compression space 11, passes through the inflow opening 7 and flows through the opening 5 to the arc 23, around the latter to blow at zero crossing.

Im Unterschied zu den herkömmlichen SF₆-Eindruckschaltern öffnet das Löschgas auf diesem Weg das Verschlussorgan 8, strömt durch die Druckkammer 3 hindurch und erreicht nach Verlassen der Druckkammer 3 durch die Ausströmöffnung 5 schliesslich die Schaltstrecke 4 um den Lichtbogen 23 zu beblasen. Ein Verschluss der Ausströmöffnung 5 durch das Rückschlagventil 6 erfolgt nicht, da bei stromschwachen Lichtbögen keine Gasdruckwelle entsteht, die stark genug ist, das Rückschlagventil 6 gegen die Kraft der Feder 31 zu schliessen.In contrast to the conventional SF₆ impression switches, the quenching gas opens the closure element 8 in this way, flows through the pressure chamber 3 and, after leaving the pressure chamber 3 through the outflow opening 5, finally reaches the switching path 4 in order to blow the arc 23. The outflow opening 5 is not closed by the check valve 6, since in the case of low-current arcs there is no gas pressure wave which is strong enough to close the check valve 6 against the force of the spring 31.

Bei der Ausschaltung stromstarker Lichtbögen passt sich der SF₆-Eindruckschalter den durch die Gasexpansion verursachten Bedingungen an und nützt diese Gasexpansion für die Herstellung des erforderlichen Isoliergasdrucks aus:
Während der ersten Phase der Ausschaltbewegung wird in der oben beschriebenen Art und Weise im Kompressionsraum 11 Isoliergas komprimiert, strömt durch die Einströmöffnung 7 in die Druckkammer 3, wobei das Verschlussorgan 8 durch die Gasströmung geöffnet wird. Während dieser ersten Phase der Ausschaltbewegung wird der Lichtbogen 23 in der Schaltstrecke 4 gezogen, wodurch Löschgas expandiert und, wie durch den gebogenen Pfeil dargestellt, in Richtung der Kompressionseinrichtung fliesst. Dies hat zur Folge, dass die Ausströmöffnung 5 durch das Rückschlagventil 6 verschlossen wird und das unter Druck stehende Gas in den Gasspeicherraum 9 fliesst. Während dieser Phase der Ausschaltbewegung herrschen durch das geschlossene Rückschlagventil 6 in der Druckkammer 3 und dem Kompressionsraum 11 reproduzierbare Druckbedingungen, so dass ein bestimmter Druck einer bestimmten Distanz zwischen den Schaltkontakten 21 und 22 zuzuordnen ist. Dadurch kann die Federkonstante der Feder 14′ so ausgelegt werden, dass das Entlüftungsventil 14 in der Schaltstellung öffnet, in der die Schaltkontakte 20, 21 die zur Lichtbogenlöschung ausreichende Distanz erreicht haben. Durch die Öffnung des Entlüftungsventils 14 sinkt der Druck im Kompressionsraum 11 stark ab, was zur Folge hat, dass das Verschlussorgan 8 sich in die Position begibt, in der es mit seinem radialen Schenkel die Einströmöffnung 7 verschliesst und gleichzeitig die Öffnung 10 freigibt. Durch die Entlüftung des Kompressionsraum 11 und die Positionsänderung des Verschlussorgans 8 tritt der SF₆-Eindruckschalter in seine zweite Phase der Ausschaltung. In dieser zweiten Phase der Ausschaltung ist der Antrieb von der Druckkraft im Kompressionsraum 11 durch dessen Entlüftung völlig entlastet, so dass es zu keiner Bremsung der Schaltbewegung oder gar einer Rückwärtsbewegung kommt, im Gegenteil - es tritt sogar eine Beschleunigung der Schaltbewegung durch die Entlastung ein. Vorteilhafterweise muss der Antrieb dadurch neben der Beschleunigung der entsprechenden Schalterteile nur die Energie für die Vorkompression des Gases in der Druckkammer 3 aufbringen.
In der zweiten Phase der Ausschaltbewegung strömt das expandierte, im Gasspeicherraum 9 gespeicherte und dabei gekühlte Gas durch die Öffnung 10 in die Druckkammer 3. Das in der Druckkammer 3 vorkomprimierte kalte Gas wird durch die Gasdruckwelle, welche vom Gasspeicherraum 9 kommt, nachkomprimiert, wobei das kalte Gas hoher Dichte vor der Ausströmöffnung 5 liegt, um in dem für die Löschung des Lichtbogens entscheidenden Moment des Stromnulldurchgangs der Beblasung zu dienen. Bei Annäherung des Stromes des Lichtbogens an den Nulldurchgang lässt der durch den Lichtbogen 23 erzeugte Gasdruck nach, das Rückschlagventil 6 öffnet sich und das kalte Gaspolster strömt aus der Ausströmöffnung 5 aus in Richtung der Schaltstrecke 4, um dort den Lichtbogen zu beblasen.
Auf diese Weise wurden bei gleichzeitiger Entlastung des Antriebs optimale Löschbedingungen geschaffen.When switching off high-current arcs, the SF₆ impression switch adapts to the conditions caused by the gas expansion and uses this gas expansion to produce the required insulating gas pressure:
During the first phase of the switch-off movement, insulating gas is compressed in the compression space 11 in the manner described above, flows through the inflow opening 7 into the pressure chamber 3, the closure member 8 being opened by the gas flow. During this first phase of the switch-off movement, the arc 23 is drawn in the switching path 4, whereby extinguishing gas expands and, as shown by the curved arrow, flows in the direction of the compression device. As a result, the outflow opening 5 is closed by the check valve 6 and the pressurized gas flows into the gas storage space 9. During this phase of the switch-off movement, the closed check valve 6 in the pressure chamber 3 and the compression chamber 11 produce reproducible pressure conditions, so that a specific pressure can be assigned to a specific distance between the switching contacts 21 and 22. This allows the spring constant of the spring 14 'to be designed so that the vent valve 14 opens in the switch position in which the switch contacts 20, 21 the have reached sufficient distance to extinguish the arc. Through the opening of the vent valve 14, the pressure in the compression space 11 drops sharply, which has the consequence that the closure member 8 moves into the position in which it closes the inflow opening 7 with its radial leg and at the same time opens the opening 10. By venting the compression chamber 11 and changing the position of the closure member 8, the SF₆ impression switch enters its second phase of switching off. In this second phase of the switch-off, the drive is completely relieved of the pressure force in the compression space 11 by venting it, so that there is no braking of the switching movement or even a backward movement, on the contrary - the switching movement is even accelerated by the relief. In addition to accelerating the corresponding switch parts, the drive advantageously only has to apply the energy for the pre-compression of the gas in the pressure chamber 3.
In the second phase of the switch-off movement, the expanded gas, which is stored in the gas storage space 9 and thereby cooled, flows through the opening 10 into the pressure chamber 3. The cold gas pre-compressed in the pressure chamber 3 is post-compressed by the gas pressure wave coming from the gas storage space 9, which cold gas of high density lies in front of the outflow opening 5 in order to serve the blowing at the moment of zero current crossing which is decisive for the extinguishing of the arc. When the current of the arc approaches zero crossing, the gas pressure generated by the arc 23 decreases, the check valve 6 opens and the cold gas cushion flows out of the outflow opening 5 in the direction of the switching path 4 in order to blow the arc there.
In this way, optimal extinguishing conditions were created while relieving the load on the drive.

Das Ventil 35 bis 39 hat bei den Ausschaltungen keine Funktion: Wird die Antriebsstange 19 zur Ausschaltung nach unten bewegt, so bleibt der Boden 1 zunächst aufgrund der Masseträgheit seiner selbst sowie der Druckkammerwandung, der Trennwand 25 und der Isolierstoffdüse 12, sowie unter der Wirkung der Reibungskraft des Kontaktes 32 in seiner Lage. Dadurch legt sich die Auskragung 38 unabhängig von der Ausgangslage des Bodens 1 gasdicht an den Sprengring 37 an, wodurch der Boden 1 im Zuge der Ausschaltbewegung mitgenommen wird. Das im Kompressionsraum 11 komprimierte Gas übt ausserdem eine Druckkraft auf den Boden 1 aus, die dem Boden 1 ebenfalls gegen den Sprengring 37 presst.The valve 35 to 39 has no function in the shutdowns: If the drive rod 19 is moved downward to shutdown, the base 1 initially remains due to the inertia of itself and the pressure chamber wall, the partition 25 and the insulating material nozzle 12, and under the effect of Frictional force of the contact 32 in its position. As a result, the projection 38 rests gas-tight on the snap ring 37 regardless of the starting position of the base 1, as a result of which the base 1 is carried along in the course of the opening movement. The gas compressed in the compression space 11 also exerts a compressive force on the base 1, which also presses the base 1 against the snap ring 37.

Während des Einschaltvorgangs wird dagegen durch das Ventil 35 bis 39 eine Belüftung des Kompressionsraums 11 durch die Druckkammer 3 hindurch erzielt: Zu Beginn der Einschaltbewegung bleibt der Boden 1 sowie das Schaltstück 21, die Druckkammer 3, der Gasspeicherraum 9 und die Düse 12, welche mit dem Boden 1 fest verbunden sind, aufgrund ihrer Masseträgheit und aufgrund der Reibungskraft des Kontaktes 32 zunächst in ihrer Ausgangslage. Damit bewegt sich die Antriebsstange 19 zunächst ohne Mitnahme des Bodens 1 nach oben, bis sich die Auskragung 38 an die Schulter 36 anlegt und der Antrieb den Boden 1 mitnimmt. In dieser Stellung besteht eine Verbindung über die Ausnehmungen 35 und 39 zwischen der Druckkammer 3 und dem Kompressionsraum 11. Die Vergrösserung des Volumens des Kompressionsraums 11 im Zuge der Einschaltbewegung führt zu einem Unterdruck im Kompressionsraum 11. Dieser Unterdruck ergibt auch eine zusätzliche Kraft, die die Auskragung 38 an die Schulter 36 anpresst. Aufgrund des Unterdrucks im Kompressionsraum 11 strömt das heisse Gas aus der Druckkammer 3 in den Kompressionsraum 11. Dadurch wiederum entsteht in der Druckkammer 3 ein Unterdruck, der dazu führt, dass die Druckkammer 3 mit kaltem Gas durch die Öffnung der Isolierstoffdüse 12 gefüllt wird. Dieses kalte Gas wird aus der die Lichtbogenlöscheinrichtung umgebenden Schaltkammer zugeführt. Die Feder 31 des Rückschlagventils 6 ist bezüglich ihrer Federkonstante so ausgewählt, dass dieses Ansaugen des kalten Gases nicht zu einem Schliessen des Rückschlagventils 6 führen kann.During the switch-on process, on the other hand, ventilation of the compression space 11 is achieved through the pressure chamber 3 through the valve 35 to 39: at the start of the switch-on movement, the base 1 and the switching element 21, the pressure chamber 3, the gas storage space 9 and the nozzle 12 remain, are firmly connected to the floor 1, initially due to their inertia and due to the frictional force of the contact 32 in their initial position. The drive rod 19 thus initially moves upwards without taking the floor 1 with it until the projection 38 bears against the shoulder 36 and the drive takes the floor 1 with it. In this position there is a connection via the recesses 35 and 39 between the pressure chamber 3 and the compression space 11. The increase in the volume of the compression space 11 in the course of the switch-on movement leads to a negative pressure in the compression space 11. This negative pressure also results in an additional force which the Cantilever 38 pressed onto the shoulder 36. Due to the negative pressure in the compression chamber 11, the hot gas flows from the pressure chamber 3 into the compression chamber 11. This in turn creates a negative pressure in the pressure chamber 3, which leads to the pressure chamber 3 being filled with cold gas through the opening of the insulating material nozzle 12. This cold gas is supplied from the switching chamber surrounding the arc extinguishing device. The spring 31 of the check valve 6 is selected with respect to its spring constant such that this suction of the cold gas cannot lead to the check valve 6 being closed.

Auf diese Weise wird das Ziel erreicht, die Druckkammer 3 durch die Einschaltbewegung mit kaltem Gas zu füllen, so dass kaltes Löschgas zur erneuten Lichtbogenbeblasung in der Druckkammer 3 bereitgestellt ist. Auf diese Weise ist auch eine Lichtbogenlöschung gewährleistet, wenn kurz nach der Unterbrechung eines Kurzschlussstromes eine erneute Ausschaltung erfolgt, welche eine Beblasung des Lichtbogens mit Hilfe der Kompressionseinrichtung erforderlich macht. Dass das heisse Gas geringer Dichte im Kompressionsraum 11 steht, ist deshalb unschädlich, weil dieses Gas erst dann zur Schaltstrecke strömt, wenn das gesamte kalte Gas aus der Druckkammer 3 den Lichtbogen 23 beblasen hat. Zu diesem Zeitpunkt, zu dem das Gas geringerer Dichte aus dem Kompressionsraum 11 nachströmt, ist der Lichtbogen 23 bereits gelöscht.In this way, the goal is achieved to fill the pressure chamber 3 with cold gas by the switch-on movement, so that cold quenching gas is provided in the pressure chamber 3 for renewed arcing. In this way, arc quenching is also ensured if, after a short-circuit current has been interrupted, the circuit is switched off again, which necessitates blowing the arc with the aid of the compression device. The fact that the hot gas of low density is in the compression space 11 is harmless because this gas only flows to the switching path when all the cold gas from the pressure chamber 3 has blown the arc 23. At this point in time, when the gas of lower density flows in from the compression space 11, the arc 23 has already been extinguished.

Die Fig. 2 zeigt eine abweichende Ausgestaltung der Böden 1 und 2 sowie des Zylinders der Kompressionskammer, der als Zylinder 17′ mit dem Boden 1 verbunden ist und durch die Ausschaltbewegung über den als Kolben ausgebildeten Boden 2 gezogen wird. Bei dieser Ausbildung wird das Entlüftungsventil 14 gegen die Kraft die einer Feder 14˝ durch einen Stift 18 geöffnet. Die Länge dieses Stifts 18 ist so bemessen, dass das Entlüftungsventil 14 beim Erreichen einer zur Lichtbogenlöschung ausreichenden Distanz zwischen den Schaltstücken 20 und 21 die Ventilplatte des Entlüftungsventils 14 aus ihrer Schliessstellung hebt. Die Feder 14˝ muss eine grössere Federkonstante aufweisen als die in Fig. 1 beschriebene Feder 14′. Das Verschlussorgan 8 ist ebenfalls als L-förmiger Ring ausgebildet, wobei jedoch zur Erzielung einer besseren Führung der axiale Schenkel länger ausgestaltet ist und durch eine Bohrung die Verbindung zum Ventil 35 bis 39 hergestellt ist. Die vom Gasspeicherraum 9 in die Druckkammer 3 führende Öffnung wurde gegegenüber Fig. 1 zur Einfügung eines als Auskragung der Antriebsstange 19 ausgebildeten Absatzes 47 nach oben verlegt. Das untere Ende 46 der Trennwand 25 wurde so ausgebildet, dass bei der Einschaltung, wenn die Auskragung 38 an der Schulter 36 anliegt, es zu einem gasdichten Abschluss zwischen dem Ende 46 der Trennwand 25 und dem Absatz 47 kommt. Dadurch wird eine durch Einschaltungen verschliessbare Öffnung 10′ erzielt. Der Vorteil dieser Ausbildung besteht darin, dass der Frischgasstrom vollständig durch die Druckkammer 3 geleitet wird, wodurch eine vollständige Füllung der Druckkammer 3 mit Frischgas erzielt wird, so dass kaltes Gas hoher Dichte zur erneuten Lichtbogenbeblasung in ausreichenden Masse vorhanden ist und auch die Wandungen eine gewisse Abkühlung erfahren.Fig. 2 shows a different embodiment of the floors 1 and 2 and the cylinder of the compression chamber, which as a cylinder 17 'with the bottom 1st is connected and is pulled by the switch-off movement over the bottom 2 designed as a piston. In this embodiment, the vent valve 14 is opened against the force of a spring 14˝ by a pin 18. The length of this pin 18 is dimensioned such that the vent valve 14 lifts the valve plate of the vent valve 14 out of its closed position when a distance between the switching pieces 20 and 21 which is sufficient for arc extinguishing is reached. The spring 14˝ must have a larger spring constant than the spring 14 'described in Fig. 1'. The closure member 8 is also designed as an L-shaped ring, but in order to achieve better guidance, the axial leg is longer and the connection to the valve 35 to 39 is made through a bore. The opening leading from the gas storage space 9 into the pressure chamber 3 has been moved upwards compared to FIG. 1 in order to insert a shoulder 47 designed as a projection of the drive rod 19. The lower end 46 of the partition wall 25 was designed such that when it is switched on when the projection 38 abuts the shoulder 36, there is a gas-tight seal between the end 46 of the partition wall 25 and the shoulder 47. As a result, a closable opening 10 'is achieved. The advantage of this design is that the fresh gas flow is passed completely through the pressure chamber 3, whereby a complete filling of the pressure chamber 3 with fresh gas is achieved, so that cold gas of high density is available in sufficient mass for renewed arcing and also the walls a certain amount Experience cooling.

Das Rückschlagventil 6 ist ebenfalls anders ausgebildet als in Fig. 1: Das Rückschlagventil 6 weist in Richtung der Schalterachse weisende Arme 34 auf, welche bei einer Einschaltung mittels eines mit der Antriebsstange 19 verbundenen Bundes 33 das Rückschlagventil 6 aus seiner Schliessstellung heben. Diese Öffnung des Rückschlagventils 6 erfolgt aufgrund der Verschiebbarkeit des Boden 1 gegenüber der Antriebsstange 19, die bei der Einschaltung auch zu einer Relativbewegung des Ventilssitzes des Rückschlagventils 6 gegenüber der Antriebsstange 19 und damit dem Bund 33 führt. Die übrige Funktion des Rückschlagventils 6 ist nicht beeinträchtigt und eine Feder ist nicht erforderlich.The check valve 6 is also designed differently than in FIG. 1: The check valve 6 has arms 34 which point in the direction of the switch axis and which, when switched on by means of a collar 33 connected to the drive rod 19, lift the check valve 6 out of its closed position. This opening of the check valve 6 takes place due to the displaceability of the base 1 relative to the drive rod 19, which when switched on also leads to a relative movement of the valve seat of the check valve 6 relative to the drive rod 19 and thus the collar 33. The rest of the function of the check valve 6 is not impaired and a spring is not required.

Die Teile mit gleichen Bezugszeichen entsprechen den Teilen der Fig. 1 und weisen dieselbe, dort beschriebene Funktion auf.The parts with the same reference numerals correspond to the parts in FIG. 1 and have the same function described there.

Fig. 2 zeigt die Ausschaltung eines stromstarken Lichtbogens. Der gerade Pfeil zeigt die Ausschaltbewegung der Antriebsstange 19. Die durch den Lichtbogen 23 verursachte Gasdruckwelle strömt in Richtung des gebogenen Pfeils unter Schliessung des Rückschlagventils 6 durch den Einlass 26 in den Gasspeicherraum 9 und von dort, in der oben (Fig. 1) beschriebenen zweiten Phase der Ausschaltung, durch die Öffnung 10′ in die Druckkammer 3. Die gestrichelten Pfeile zeigen das Zurückfluten des Gases aus der Druckkammer 3 bei Annäherung des Stromes an den Nulldurchgang mit einer Beblasung des Lichtbogens 23. Da die zur Erreichung einer Lichtbogenlöschung ausreichende Distanz zwischen den Schaltkontakten 20, 21 erzielt ist, hat der Stift 18 das Entlüftungsventil 14 geöffnet. Die durch die Entlüftungsbohrung 13 weisenden Pfeile zeigen die Entlüftung des Kompressionsraums 11, welche zu einer Entlastung des Antriebs führt.Fig. 2 shows the switching off of a high-current arc. The straight arrow shows the switch-off movement of the drive rod 19. The gas pressure wave caused by the arc 23 flows in the direction of the curved arrow with the check valve 6 closed, through the inlet 26 into the gas storage space 9 and from there, in the second one described above (FIG. 1) Phase of the switch-off, through the opening 10 'in the pressure chamber 3. The dashed arrows show the backflowing of the gas from the pressure chamber 3 when the current approaches the zero crossing with a blowing of the arc 23. Since the sufficient distance to achieve an arc extinguishing between the Switch contacts 20, 21 is achieved, the pin 18 has opened the vent valve 14. The arrows pointing through the ventilation hole 13 show the ventilation of the compression space 11, which leads to a relief of the drive.

Fig. 3 zeigt das Ausführungsbeispiel gemäss Fig. 2 bei der Einschaltung. Der gerade, nach oben weisende Pfeil zeigt die Einschaltbewegung der bewegten Schalterteile. Die Auskragung 38 liegt an der Schulter 36 an, wodurch die Druckkammer 3 über die Ausnehmung 35 sowie die Ausnehmungen 39 und der Belüftungsöffnung 30 mit dem Kompressionsraum 11 verbunden ist. Der sich durch die Einschaltung vergrössernde Kompressionsraum 11 saugt, wie die gestrichelte Linie zeigt, das Gas aus der Druckkammer 3. Da das Rückschlagventil 6 geöffnet ist, strömt, wie die gebogenen Pfeile zeigen, frisches Löschgas hoher Dichte aus der die Lichtbogenlöscheinrichtung umgebenden Schaltkammer durch die Düse 12 und die Ausströmöffnung 5 in die Druckkammer 3. Das Entlüftungsventil 14 ist bei der Einschaltung geschlossen.Fig. 3 shows the embodiment of FIG. 2 when switched on. The straight arrow pointing upwards shows the switch-on movement of the moving switch parts. The projection 38 bears against the shoulder 36, as a result of which the pressure chamber 3 is connected to the compression space 11 via the recess 35 and the recesses 39 and the ventilation opening 30. The compression space 11, which increases as a result of the activation, sucks the gas out of the pressure chamber 3, as the dashed line shows. Since the check valve 6 is open, fresh arc gas of high density flows out of the switching chamber surrounding the arc quenching device, as shown by the curved arrows Nozzle 12 and the outflow opening 5 into the pressure chamber 3. The vent valve 14 is closed when it is switched on.

Die Fig. 4, 5 und 6 zeigen eine andere Ausgestaltung des Ventils mit den Teilen 7, 8, 24 und 40 bis 48 in verschiedenen Schaltsituationen.4, 5 and 6 show another embodiment of the valve with parts 7, 8, 24 and 40 to 48 in different switching situations.

Bei dieser Ausgestaltung des Ventils dient die Einströmöffnung 7 als Belüftungsöffnung für die Einschaltung. Das Verschlussorgan 8 übernimmt die Funktion des Ventils, wobei dieses Verschlussorgan 8 bei der Einschaltung geöffnet wird. Dazu ist der Boden 1 mit einer ringförmigen, die Antriebsstange 19 umfassenden Auskragung 43 ausgestattet. Diese Auskragung 43 greift in eine ringförmige Nut 40 der Antriebsstange 19 ein, wobei der Boden 1-sowie die mit diesem verbundenen Schalterteile - dadurch eine geringe Verschiebung ausführen kann, dass die Auskragung 43 eine geringere Breite aufweist als die Nut 40. Bei der Ausschaltung liegt die Auskragung 43 an der Schulter 41 der Nut 40 an. Bei der Einschaltung liegt die Auskragung 43 dagegen an der Schulter 42 an. Bei dieser Ausbildung gleitet der Boden 1 gasdicht auf der Antriebsstange 19. Mit der Antriebsstange 19 ist eine Haltenase 45 verbunden, die in eine Aussparung 44 des Verschlussorgans 8 eingreift. Diese Haltenase 45 ist so angeordnet, dass sie bei einer Einschaltung das Verschlussorgan 8, bedingt durch die Relativbewegung des Boden 1 gegenüber der Antriebsstange 19, aus seiner Schliessstellung hebt. Dadurch ist die Druckkammer 3 über die Einströmöffnung 7 mit dem Kompressionsraum 11 verbunden. Der Pfeil durch die Einströmöffnung 7 zeigt die Ansaugung des in der Druckkammer 3 befindlichen Gases in den Kompressionsraum 11. Gleichzeitig ist in der obenbeschriebenen Weise die Öffnung 10′ verschlossen. Das Frischgas kann wie bei Fig. 3 beschrieben in die Druckkammer 3 strömen. Auch bei dieser Ausgestaltung erfolgt die Relativbewegung des Boden 1 gegenüber der Antriebsstange 19, wie bereits erläutert, durch die Masseträgheit, die Reibung und die Drücke.In this embodiment of the valve, the inflow opening 7 serves as a ventilation opening for switching on. The closure member 8 takes over the function of the valve, this closure member 8 being opened when switched on. For this purpose, the base 1 is equipped with an annular projection 43 which comprises the drive rod 19. This projection 43 engages in an annular groove 40 of the drive rod 19, wherein the base 1 - and the switch parts connected to it - can carry out a slight displacement in that the projection 43 has a smaller width than the groove 40. When it is switched off the projection 43 on the Shoulder 41 of the groove 40 on. When switched on, the projection 43, however, rests on the shoulder 42. In this embodiment, the bottom 1 slides in a gastight manner on the drive rod 19. A holding lug 45 is connected to the drive rod 19 and engages in a recess 44 in the closure member 8. This retaining lug 45 is arranged in such a way that when it is switched on it lifts the closure member 8 out of its closed position due to the relative movement of the base 1 with respect to the drive rod 19. As a result, the pressure chamber 3 is connected to the compression space 11 via the inflow opening 7. The arrow through the inflow opening 7 shows the suction of the gas located in the pressure chamber 3 in the compression chamber 11. At the same time, the opening 10 'is closed in the manner described above. The fresh gas can flow into the pressure chamber 3 as described in FIG. 3. In this embodiment too, the relative movement of the base 1 with respect to the drive rod 19 takes place, as already explained, by the inertia, the friction and the pressures.

Fig. 5 zeigt dieselbe Ausbildung bei der Ausschaltung eines stromstarken Lichtbogens. Die Einströmöffnung 7 wurde dadurch, dass der Stift 18 das Entlüftungsventil 14 geöffnet hat (zweite Phase der Ausschaltung) unter dem Druck der Feder 24 auf das Verschlussorgan 8 geschlossen und die Gasdruckwelle strömt durch die Öffnung 10′ in die Druckkammer 3. Bei Annäherung des Stromes an den Nulldurchgang öffnet das Rückschlagventil 6 und der Lichtbogen wird beblasen.Fig. 5 shows the same training when switching off a high-current arc. The inflow opening 7 was closed by the fact that the pin 18 had opened the vent valve 14 (second phase of the switch-off) under the pressure of the spring 24 on the closure element 8 and the gas pressure wave flows through the opening 10 'into the pressure chamber 3. When the current approaches at the zero crossing, the check valve 6 opens and the arc is blown.

Fig. 6 zeigt die Ausbildung gemäss Fig. 4 bei der Ausschaltung eines stromschwachen Lichtbogens. Das im Kompressionsraum 11 komprimierte Gas strömt durch die Einströmöffnung 7 unter Öffnung des Verschlussorgans 8 gegen den Druck der Feder 24 und unter Verschliessung der Öffnung 10′ in die Druckkammer 3. Von dort strömt dieses Löschgases unter Öffnung des Rückschlagventils 6 zur Schaltstrecke, wo der Lichtbogen beblasen wird. Die Trennwand 25 ist an ihrem unteren Ende 46 so ausgebildet, dass sie mit dem Verschluss 48, welcher durch den oberen Teil des senkrechten Schenkels des Verschlussorgans 8 gebildet wird, zur Anlage kommt und dadurch eine Schliessung der Öffnung 10′ bewirkt.FIG. 6 shows the design according to FIG. 4 when a low-current arc is switched off. The compressed gas in the compression chamber 11 flows through the inflow opening 7 while opening the closure member 8 against the pressure of the spring 24 and closing the opening 10 'in the pressure chamber 3. From there this quenching gas flows through the opening of the check valve 6 to the switching path, where the arc is blown. The partition 25 is formed at its lower end 46 so that it comes to rest with the closure 48, which is formed by the upper part of the vertical leg of the closure member 8, and thereby closes the opening 10 '.

Bezugszeichenlisten F 88/32Lists of reference symbols F 88/32

1 und 21 and 2
Böden (welche den Kompressionsraum 11 begrenzen)Floors (which limit the compression space 11)
33rd
DruckkammerPressure chamber
44th
SchaltstreckeSwitching distance
55
AusströmöffnungOutflow opening
66
Rückschlagventilcheck valve
77
EinströmöffnungInflow opening
88th
VerschlussorganClosure organ
99
GasspeicherraumGas storage room
1010th
Öffnungopening
10′10 ′
verschliessbare Öffnung (Öffnung 10 als verschliessbare Öffnung ausgebildet)closable opening (opening 10 is designed as a closable opening)
1111
KompressionsraumCompression space
1212th
IsolierstoffdüseInsulating nozzle
1313
EntlüftungsbohrungVent hole
1414
EntlüftungsventilVent valve
14′, 14˝14 ′, 14˝
Feder (des Entlüftungsventils 14)Breather valve spring 14
1717th
KompressionszylinderCompression cylinder
1818th
Stiftpen
1919th
AntriebsstangeDrive rod
2020th
Schaltstück (feststehend)Contact piece (fixed)
2121
Schaltstück (beweglich)Contact piece (movable)
2323
LichtbogenElectric arc
2424th
Federfeather
2525th
Trennwandpartition wall
2626
Einlassinlet
3030th
BelüftungsöffnungVentilation opening
3131
Federfeather
3232
KontaktContact
3333
BundFederation
3434
Armepoor
3535
ringförmige Ausnehmung (der Antriebsstange 19)annular recess (of the drive rod 19)
3636
Schultershoulder
3737
SprengringSnap ring
3838
Auskragung (nach innen in die ringförmige Ausnehmung 35 eingreifend)Cantilever (engaging inward in the annular recess 35)
3939
Ausnehmung (in der Art radial angeordneter Ausfräsungen)Recess (in the manner of radially arranged cutouts)
4040
ringförmige Nut (der Antriebsstange 19)annular groove (the drive rod 19)
41, 4241, 42
Schultern der ringförmigen Ausnehmung 40Shoulders of the annular recess 40
4343
Auskragung (nach innen in die ringförmige Nut 40 eingreifend)Cantilever (engaging in the annular groove 40 inwards)
4444
Aussparung (des Verschlussorgans 8)Recess (of the closure member 8)
4545
HaltenaseHolding nose
4646
unteres Ende der Trennwand 25, zusammenwirkend mit dem Absatz 47 (ausgebildet als Auskragung der Antriebsstange) beziehungsweise 48 (ausgebildet als senkrechter Schenkel des Verschlussorgans 8)lower end of the partition 25, cooperating with the shoulder 47 (designed as a projection of the drive rod) or 48 (designed as a vertical leg of the closure member 8)

Claims (11)

  1. SF₆ compression switch with a switch chamber filled with insulating gas, at least two switch members (20, 21), of which at least one (21) is movable by a drive rod (19), a compression device (17), which is actuable by this switching movement, for the insulating gas, the compression chamber (11) of which is bounded by two oppositely disposed and relatively movable bases (1, 2), wherein arranged between the insulating material nozzle (12) and the base (1) facing it is a pressure chamber (3) which in the direction of the switching path has an outflow opening (5) closable by a non-return valve (6), and an inflow opening (7) closable by means of a closure element (8) is arranged in the base (1) and a gas storage chamber (9) connected with the switching path extends to an opening (10), which is closable by means of the closure element (8) and opens into the part of the pressure chamber (3) remote from the outflow opening (5), wherein in a first position of the closure element (8) the inflow opening (7) is open and the opening (10) is closed and in a second position of the closure element (8) the inflow opening (7) is closed and the opening (10) is open and thus the position change of the closure element (8) is controllable by the switching travel traversed or by the arising pressure, wherein the drive rod (19) is mounted to be limitedly axially displaceable relative to the base (1) and the pressure chamber (3), a ventilation opening (30; 7) with a valve (35-39; 8, 24, 40-48) is arranged between the compression chamber (11) and the pressure chamber (3), the displacement of the drive rod (19) relative to the base (1) during switching-on of the switch causes an opening of the valve, and the non-return valve (6) is held in open setting during switching-on of the switch.
  2. SF₆ compression switch according to claim 1, characterised thereby that the non-return valve (6) is equipped with a spring (31), the spring constant of which is so dimensioned that the non-return valve (6) closes in the case of a gas pressure wave arising through current-intensive arcs, but remains open on suckinq of gas into the compression chamber (11).
  3. SF₆ compression switch according to claim 1 or 2, characterised by a valve (35 to 39), at which the base (1), which separates the pressure chamber (3) from the compression chamber (11), is equipped with an annular projection (38) embracing the drive rod (19), wherein the projection (38) so engages in an annular recess (35) of the drive rod (19) that the projection (38) in the case of a switching-on movement bears sealingly against a circlip (37) bounding the recess (35) and in the case of a switching-off movement the projection (38) bears against a shoulder (36) of the recess (35), wherein the pressure chamber (3) is connected with the compression chamber (11) by way of recesses (39).
  4. SF₆ compression switch according to one of claims 1 to 3, characterised thereby that the recesses (39) are arranged as radially arranged millings out at the side of the projection (38) remote from the shoulder (36).
  5. SF₆ compression switch according to one or more of claims 1 to 4, characterised thereby that the closure element (8) is constructed as an axially displaceable ring with L-shaped cross-section, wherein in the first position of the closure element (8) the axial limb is punched sealingly in front of the opening (10) and the inflow opening (7) is freed and in the second position the opening (10) is freed and the inflow opening (7) is closed by the radial limb, and that the axial displacement of the L-shaped ring is effected by a ventilation of the compression chamber (11).
  6. SF₆ compression switch according to claim 5, characterised thereby that the ventilation of the compression chamber (11) is effected by a ventilation bore (13) with a ventilating valve (14), which opens against the force of a spring (14′), wherein the spring constant is so determined that the opening of the ventilating valve (14′) takes place in the case of a pressure in the compression chamber (11), which arises when, with closed non-return valve (6), the spacing between the switch contacts (20, 21) sufficient for arc quenching is achieved.
  7. SF₆ compression switch according to claim 5, characterised thereby that the ventilating valve (14) opens against the force of a spring (14˝), the spring constant of which is greater than that of the spring (14′), and that connected with the base (1) is a pin (8) which is so dimensioned in its length that it opens the ventilating valve (14) on attainment of a spacing between the switch contacts (20, 21) sufficient for arc quenching.
  8. SF₆ compression switch according to claim 5, characterised thereby that the base (2) runs over a cutout, which is arranged at the compression cylinder (17) and/or at the drive rod (19) and which connects the compression chamber (11) with the switch chamber on attainment of a spacing between the switch contacts (20, 21) sufficient for arc quenching.
  9. SF₆ compression switch according to one or more of claims 5 to 8, characterised thereby that the partition wall (25) fixedly connected with the base (1) comes to bear by its lower end (46) at a step (47), which is constructed as a projection of the drive rod (19) when the projection (38) bears against the shoulder (36), whereby the opening (10′) is closed.
  10. SF₆ compression switch according to one or more of claims 1, 2 or 6 to 9 and 5, with a valve (7, 8, 24 and 40 to 48), characterised thereby that the base (1) is equipped with an annular projection (43) embracing the drive rod (19), wherein the projection (43) engages in an annular groove (40) of the rod (19), the projection (43) bears against the shoulder (42) when a switching-on movement takes place and against the shoulder (4′) when a switching-off movement takes place, that the base (1) is gas-tightly guided at the drive rod (19), and that a retaining lug (45) connected with the drive rod (19) engages in a cutout (44) of the closure element (8) and slides sealing in front of the opening (10′) when a switching-on takes place, whereby the inflow opening (7) is opened at the same time.
  11. SF₆ compression switch according to one or more of claims 1 to 10, characterised thereby that the non-return valve (6) is provided with arms (34) which point in the direction of the switch axis and which raise the non-return valve (6) out of its closed setting by means of a collar (33), which is connected with the drive rod (19), when a switching-on takes place.
EP89117724A 1988-12-23 1989-09-26 Single-pressure switch with SF6 Expired - Lifetime EP0374384B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883843406 DE3843406A1 (en) 1988-03-25 1988-12-23 SF6 single-pressure circuit breaker (puffer circuit breaker)
DE3843406 1988-12-23

Publications (3)

Publication Number Publication Date
EP0374384A2 EP0374384A2 (en) 1990-06-27
EP0374384A3 EP0374384A3 (en) 1991-06-19
EP0374384B1 true EP0374384B1 (en) 1994-12-28

Family

ID=6369955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89117724A Expired - Lifetime EP0374384B1 (en) 1988-12-23 1989-09-26 Single-pressure switch with SF6

Country Status (2)

Country Link
EP (1) EP0374384B1 (en)
DE (1) DE58908837D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5898149A (en) * 1995-09-30 1999-04-27 Asea Brown Boveri Ag Power circuit-breaker

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2751462B1 (en) * 1996-07-22 1998-08-28 Gec Alsthom T & D Sa HIGH VOLTAGE CIRCUIT BREAKER WITH SELF-BLOWING ARC
FR2799571B1 (en) * 1999-10-07 2001-12-21 Schneider Electric High Voltag SELF-EXPANSION BREAKER WITH PRESSURE AND FILLING VALVE
EP3032561B1 (en) * 2014-12-08 2017-08-30 Siemens Aktiengesellschaft Electric switch arrangement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH568649A5 (en) * 1974-07-29 1975-10-31 Sprecher & Schuh Ag
CH655611B (en) * 1981-06-18 1986-04-30
FR2575323B1 (en) * 1984-12-20 1987-01-16 Alsthom Atlantique COMPRESSED GAS CIRCUIT BREAKER
FR2596575B1 (en) * 1986-03-26 1988-05-20 Alsthom DIELECTRIC GAS CIRCUIT BREAKER UNDER PRESSURE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5898149A (en) * 1995-09-30 1999-04-27 Asea Brown Boveri Ag Power circuit-breaker

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Publication number Publication date
EP0374384A3 (en) 1991-06-19
EP0374384A2 (en) 1990-06-27
DE58908837D1 (en) 1995-02-09

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