EP0025833B1 - Gas blast switch - Google Patents

Gas blast switch Download PDF

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Publication number
EP0025833B1
EP0025833B1 EP80104262A EP80104262A EP0025833B1 EP 0025833 B1 EP0025833 B1 EP 0025833B1 EP 80104262 A EP80104262 A EP 80104262A EP 80104262 A EP80104262 A EP 80104262A EP 0025833 B1 EP0025833 B1 EP 0025833B1
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EP
European Patent Office
Prior art keywords
contact element
gas
blast
switch
contact
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
EP80104262A
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German (de)
French (fr)
Other versions
EP0025833A1 (en
Inventor
Rudolf Graf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rockwell Automation Switzerland GmbH
Original Assignee
Sprecher und Schuh AG
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Filing date
Publication date
Application filed by Sprecher und Schuh AG filed Critical Sprecher und Schuh AG
Priority to AT80104262T priority Critical patent/ATE1400T1/en
Publication of EP0025833A1 publication Critical patent/EP0025833A1/en
Application granted granted Critical
Publication of EP0025833B1 publication Critical patent/EP0025833B1/en
Expired legal-status Critical Current

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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
    • H01H33/02—Details
    • H01H33/24—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
    • H01H33/245—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring using movable field electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H2033/028—Details the cooperating contacts being both actuated simultaneously in opposite directions

Definitions

  • the invention relates to a gas pressure switch of the type mentioned in the preamble of claim 1.
  • gas pressure switches are known, for example, from CH-A 554597 or from DE-A 2140284.
  • the shielding body has the function during a switch-off stroke to make the electrical field that emanates from the end of the second (usually tubular) contact piece more uniform, so that - after the switching arc has been extinguished - no extreme values of the field strength have arisen.
  • the spring under the action of which the shielding body is located, also has the advantage that the parts of the switch that are moved are effectively decelerated towards the end of a switch-on stroke.
  • the second contact piece, to which the shielding body is assigned is arranged in a stationary manner, from which it follows that the distance to be covered by the first contact piece during a switch-off stroke has to correspond exactly to the switching distance between the contact pieces in the switch-off position.
  • the separation distance between the contact pieces i.e. the minimum distance that the contact pieces have to have from one another so that the switching arc is extinguished at all, the greater the currents to be interrupted. It is of course desirable that this separation distance is achieved as quickly as possible with a switch-off stroke. In the case of the known switches, this requires a long-stroke drive mechanism which, moreover, is sufficiently powerful to bring about the desired separation distance within a useful period.
  • one purpose of the invention is to provide a switch of the type mentioned in which, while maintaining the advantages mentioned, which the shielding body and its spring offer, and using only one and only relatively short-stroke drive the separation distance is reached much faster, and in which the switching distance between the contact pieces in the off position exceeds the length of the stroke of the drive.
  • This purpose is achieved in the proposed pressure gas switch in that the shielding body and the second contact piece are coupled to one another for opposite movement.
  • the blowing nozzle moves the shielding body back in the course of a switch-on stroke, the second contact piece pushes through the blowing nozzle in the direction of the first contact piece. Conversely, if the shielding body can move into its advanced position due to the retracting blowing nozzle during a switch-off stroke, then the second contact piece also moves away from the first contact piece at the same time.
  • a compressed gas switch 10 is shown in the switched-on position in FIG. 1, in the switched-off position in FIG. 3 and in an intermediate position in FIG. 2.
  • This gas pressure switch has two sets of contact pieces.
  • the first set is connected to a switch drive 11, which is only shown schematically, and comprises a first, tubular contact piece 12 and a first, also tubular nominal current contact 13, these two contacts - as will be shown later - are mechanically connected to one another so that they move in the same direction and the same way.
  • the first rated current contact 13 is closed by a flange 14 in the region of its free end.
  • the first rated current contact is slidably mounted on a fixedly supported pump piston 15.
  • This pump piston 15 is provided with a central passage 16, in which the first contact piece 12 is slidably mounted. At least in the switched-on position, a pump chamber 17, which contains an extinguishing gas, is thus enclosed by the flange 14, the inside of the first rated current contact 13, the outside of the first contact piece 12 and the pump piston.
  • a cylindrical extension 19 which extends into the pump chamber 17 and is fixed in the region of its free end via further webs 20 on the outside of the first contact piece 12, is fastened via webs 18.
  • the pump piston 15 there is a recess 21 shaped in the same way as the extension 19, which is intended to receive the extension 19 in the course of the switch-off stroke, as a result of which, as can be seen from FIG "is divided.
  • an overall blowing nozzle 22, made of an electrical insulating material, is attached on the flange 14.
  • This has a nozzle body 23 which has an inlet area 24 starting from the spaces between the struts 18, a narrowest point 25 and an outlet area 26 which widens in the manner of a diffuser.
  • a partition wall 27 in the form of a hollow truncated cone which divides the inlet region 24 into two mutually separate, but coaxial and converging towards the narrowest point 25, shell-shaped inlet channels 24 'and 24 "(FIG. 2), whereby the inlet channel 24 'is always in communication with the pump chamber 17' and the inlet channel 24 "is always in communication with the pump chamber 17 " .
  • the passage cross section of the inlet channel 24 ' is significantly smaller than that of the inlet channel 24 ". This has the consequence that as soon as the extension 19 begins to penetrate into the depression 21 in the course of a switch-off stroke, the pressure increase in the pump chamber 17 'is currently greater than in the pump chamber 17 "because of the lower outflow possibility Area of the narrowest point 25 caused by the heating, high-pressure quenching gases - as far as they cannot escape through the outlet area 26 - at most only and also only temporarily pushed back into the pump chamber 17 " , while the switching arc is blown with fresh quenching gas from the Pump chamber 17 'is continued.
  • first nominal current contact 13 interacts with a second, stationary and also tubular, second nominal current contact 28.
  • a likewise metallic ring 30 is held via metallic struts 29, in which a second, likewise tubular contact piece 31 is mounted so as to be longitudinally displaceable. 1 that this second contact piece 31 practically closes the blowing nozzle 22 at its narrowest point 25 in the switched-on position and at the same time engages in the free end of the first contact piece 12.
  • a tension spring 32 is fastened (only shown schematically in FIG. 1), the other end of which is fastened at a fixed location 33 in the switch. The tension spring 32 tends to pull the second contact piece 31 upwards in FIG. 1.
  • each bearing eye 34 On the lateral surface of the second contact piece 31 there are a plurality of bearing eyes 34 distributed at uniform angular intervals.
  • a two-armed lever 35 On each bearing eye 34, one end of a two-armed lever 35 is articulated, which in turn can be pivoted about a pivot pin 36 in a bearing eye 37 formed in each case on a strut 29.
  • the other end of each of the two-armed levers 35 is articulated at 38 to one end of a rocker 39.
  • the other end of each rocker 39 is articulated on a bearing eye 40 which is anchored on the side of a shielding body 41 made of sheet metal facing away from the blowing nozzle.
  • This shielding body 41 has on its circumference an edge 42 bent towards the lever 35, which - at least in its advanced position according to FIGS. 2 and 3 - is in electrical contact with the contact surfaces of the second nominal current contact 28.
  • this shielding body 41 has in its center an approximately funnel-shaped passage 43 which, as can be seen in FIG. 1, is practically closed in the switched-on position by the area of the nozzle body 23 on the outlet side.
  • a shoulder 44 is also formed, which is used during the switch-on stroke, i.e. during the transition from the position shown in FIG. 3 to the position shown in FIG. 1, to cooperate with the end face 45 (FIG. 2, 3) of the shielding body 41 facing the blowing nozzle 22 and thus to move the shielding body 41 back along the second contact piece 31.
  • the shielding body 41 runs under the action of the tension spring 32 acting on the lever 35 of the second contact piece 31, and at the same time the second contact piece also pulls 31 from its position advanced in relation to the second rated current contact 28.
  • 2 shows the advanced end position of the shielding body 41 and, at the same time, the retracted end position of the second contact piece 31, which end position can be defined by stops, not shown in detail.
  • the ratio of the displacement path of the shielding body 41 and the (opposite) path of the second contact piece 31 depends on the “transmission ratio” of the levers 35.
  • the shielding body 41 which primarily has the function of making the electrical field at the end of the contact pieces 28 and 31 as uniform as possible, i.e. in the position acc. 2, a comparatively small displacement path can be sufficient.

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  • Circuit Breakers (AREA)
  • Coloring (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Glass Compositions (AREA)
  • Vehicle Body Suspensions (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Control Of Combustion (AREA)

Abstract

A gas-blast switch provided with two coaxially arranged contact elements which can be brought into and out of engagement with one another by carrying out an axial movement. The first contact element which is connected with a drive is arranged in a fixed reference position forwardly of a blast nozzle. The blast nozzle is connected at its inlet side with a compression chamber or space which can be pressurized during the cut-off stroke of the gas-blast switch. In the cut-on stroke of such gas-blast switch the second contact element engages with the blast nozzle. The second contact element is surrounded by a screening body which, in turn, can be shifted back by means of the blast nozzle, during a cut-on stroke of the gas-blast switch, out of its advanced position in the cut-off position, against the action of a spring, along the second contact element. In order to more rapidly increase the spacing between both contact elements at the start of a cut-off stroke than such would correspond to the path of the cut-off stroke, the screening body and the second contact element are coupled with one another so as to perform opposite movements in relation to one another.

Description

Die Erfindung betrifft einen Druckgasschalter der im Oberbegriff des Patentanspruches 1 genannten Art. Solche Druckgasschalter sind beispielsweise aus der CH-A 554597 oder aus der DE-A 2140284 bekannt. Bei diesen Schaltern kommt dem Abschirmkörper bei einem Ausschalthub die Funktion zu, das elektrische Feld, das vom Ende des zweiten (in der Regel rohrförmigen) Kontaktstück ausgeht, zu vergleichmässigen, um - nach der Löschung des Schaltlichtbogens - keine Extremwerte der Feldstärke entstehen zu lassen. Dabei bietet die Feder, unter deren Wirkung der Abschirmkörper steht, ausserdem den Vorteil, dass gegen Ende eines Einschalthubes die dabei bewegten Teile der Schalters wirksam verzögert werden. Dabei wird auch ein Teil der beim Einschalthub vom Schalterantrieb aufgebrachten mechanischen Kraft durch die Feder bis zum nächstfolgenden Ausschalthub gespeichert und unterstützt sodann den Ausschalthub. Bei den bekannten Schaltern ist indessen das zweite Kontaktstück, dem der Abschirmkörper zugeordnet ist, ortsfest angeordnet, woraus folgt, dass der vom ersten Kontaktstück bei einem Ausschalthub zurückzulegende Weg exakt der zwischen den Kontaktstücken in Ausschaltstellung vorhandenen Schaltstrecke zu entsprechen hat. Ausserdem ist es eine bekannte Tatsache, dass die Trennstrecke zwischen den Kontaktstücken, d.h. die minimale Distanz, die die Kontaktstücke voneinander aufzuweisen haben, damit eine Löschung des Schaltlichtbogens überhaupt zustande kommt, grösser wird, je grösser die zu unterbrechenden Ströme werden. Es ist natürlich anzustreben, dass diese Trenndistanz bei einem Ausschalthub so rasch als möglich erreicht wird. Dies bedingt bei den bekannten Schaltern einen langhubigen Antriebsmechanismus, der darüber hinaus ausreichend leistungsfähig ist, um innert nützlicher Frist die erwünschte Trenndistanz herbeizuführen.The invention relates to a gas pressure switch of the type mentioned in the preamble of claim 1. Such gas pressure switches are known, for example, from CH-A 554597 or from DE-A 2140284. With these switches, the shielding body has the function during a switch-off stroke to make the electrical field that emanates from the end of the second (usually tubular) contact piece more uniform, so that - after the switching arc has been extinguished - no extreme values of the field strength have arisen. The spring, under the action of which the shielding body is located, also has the advantage that the parts of the switch that are moved are effectively decelerated towards the end of a switch-on stroke. Part of the mechanical force applied by the switch drive during the switch-on stroke is also stored by the spring until the next switch-off stroke and then supports the switch-off stroke. In the known switches, however, the second contact piece, to which the shielding body is assigned, is arranged in a stationary manner, from which it follows that the distance to be covered by the first contact piece during a switch-off stroke has to correspond exactly to the switching distance between the contact pieces in the switch-off position. In addition, it is a known fact that the separation distance between the contact pieces, i.e. the minimum distance that the contact pieces have to have from one another so that the switching arc is extinguished at all, the greater the currents to be interrupted. It is of course desirable that this separation distance is achieved as quickly as possible with a switch-off stroke. In the case of the known switches, this requires a long-stroke drive mechanism which, moreover, is sufficiently powerful to bring about the desired separation distance within a useful period.

Bei diesem Stand der Technik ist ein Zweck der Erfindung darin zu sehen, einen Schalter der eingangs genannten Art zu schaffen, bei dem unter Beibehaltung der genannten Vorteile, die der Abschirmkörper und dessen Feder bieten, und unter Verwendung nur eines und erst noch relativ kurzhubigen Antriebes die Trenndistanz viel rascher erreicht ist, und bei dem die zwischen den Kontaktstücken in Ausschaltstellung vorhandene Schaltstrecke die Länge des Hubes des Antriebes übertrifft. Dieser Zweck wird bei dem vorgeschlagenen Druckgasschalter dadurch erreicht, dass der Abschirmkörper und das zweite Kontaktstück zu gegenläufiger Bewegung miteinander gekuppelt sind.In this prior art, one purpose of the invention is to provide a switch of the type mentioned in which, while maintaining the advantages mentioned, which the shielding body and its spring offer, and using only one and only relatively short-stroke drive the separation distance is reached much faster, and in which the switching distance between the contact pieces in the off position exceeds the length of the stroke of the drive. This purpose is achieved in the proposed pressure gas switch in that the shielding body and the second contact piece are coupled to one another for opposite movement.

Wenn also die Blasdüse im Zuge eines Einschalthubes den Abschirmkörper zurückverschiebt, stösst das zweite Kontaktstück durch die Blasdüse hindurch in Richtung auf das erste Kontaktstück vor. Umgekehrt, wenn bei einem Ausschalthub der Abschirmkörper wegen der sich zurückziehenden Blasdüse sich in seine vorgeschobene Stellung verschieben kann, dann entfernt sich gleichzeitig und zusätzlich das zweite Kontaktstück vom ersten Kontaktstück.If the blowing nozzle moves the shielding body back in the course of a switch-on stroke, the second contact piece pushes through the blowing nozzle in the direction of the first contact piece. Conversely, if the shielding body can move into its advanced position due to the retracting blowing nozzle during a switch-off stroke, then the second contact piece also moves away from the first contact piece at the same time.

Merkmale bevorzugter Ausführungsformen der Erfindung sind den abhängigen Ansprüchen zu entnehmen und ergeben sich auch aus der nachfolgenden, rein beispielsweisen Beschreibung anhand der Zeichnung. Es zeigen:

  • die Fig. 1 - 3 schematische Axialschnitte durch die in diesem Zusammenhang wesentlichen Bestandteile eines Druckgasschalters in drei verschiedenen Stellungen.
Features of preferred embodiments of the invention can be found in the dependent claims and also result from the following, purely exemplary description, using the drawing. Show it:
  • 1 - 3 are schematic axial sections through the essential components of a compressed gas switch in three different positions.

Ein Druckgasschalter 10 ist in Fig. 1 in Einschaltstellung, in Fig. 3 in Ausschaltstellung und in Fig. 2 in einer Zwischenstellung dargestellt. Dieser Druckgasschalter weist zwei Sätze von Kontaktstücken auf. Der erste Satz ist mit einem nur schematisch angegebenen Schalterantrieb 11 verbunden und umfasst ein erstes, rohrförmiges Kontaktstück 12, sowie einen ersten, ebenfalls rohrförmigen Nennstromkontakt 13, wobei diese beiden Kontakte - wie noch zu zeigen sein wird - mechanisch miteinander verbunden sind, so dass sie sich jeweils gleichsinnig und um den gleichen Weg verschieben. Der erste Nennstromkontakt 13 ist im Bereich seines freien Endes durch einen Flansch 14 verschlossen. Ausserdem ist der erste Nennstromkontakt verschiebbar auf einem ortsfest abgestützten Pumpkolben 15 gelagert. Dieser Pumpkolben 15 ist mit einem zentralen Durchlass 16 versehen, in dem das erste Kontaktstück 12 verschiebbar gelagert ist. Zumindest in Einschaltstellung wird somit durch den Flansch 14, die Innenseite des ersten Nennstromkontaktes 13, die Aussenseite des ersten Kontaktstückes 12 und dem Pumpkolben ein Pumpraum 17 umschlossen, der ein Löschgas enthält.A compressed gas switch 10 is shown in the switched-on position in FIG. 1, in the switched-off position in FIG. 3 and in an intermediate position in FIG. 2. This gas pressure switch has two sets of contact pieces. The first set is connected to a switch drive 11, which is only shown schematically, and comprises a first, tubular contact piece 12 and a first, also tubular nominal current contact 13, these two contacts - as will be shown later - are mechanically connected to one another so that they move in the same direction and the same way. The first rated current contact 13 is closed by a flange 14 in the region of its free end. In addition, the first rated current contact is slidably mounted on a fixedly supported pump piston 15. This pump piston 15 is provided with a central passage 16, in which the first contact piece 12 is slidably mounted. At least in the switched-on position, a pump chamber 17, which contains an extinguishing gas, is thus enclosed by the flange 14, the inside of the first rated current contact 13, the outside of the first contact piece 12 and the pump piston.

An der dem Pumpraum 17 zugekehrten Seite des Flansches 14 ist über Stege 18 ein zylindrischer, sich in den Pumpraum 17 hinein erstrekkender Fortsatz 19 befestigt, der im Bereich seines freien Endes über weitere Stege 20 an der Aussenseite des ersten Kontaktstückes 12 befestigt ist. Im Pumpkolben 15 dagegen ist eine gegengleich zum Fortsatz 19 geformte Vertiefung 21 vorhanden, die dazu bestimmt ist, im Zuge des Ausschalthubes den Fortsatz 19 aufzunehmen, wodurch - wie aus Fig. 2 ersichtlich - der Pumpraum 17 in zwei voneinander getrennte Pumpräume 17' und 17" unterteilt wird.On the side of the flange 14 facing the pump chamber 17, a cylindrical extension 19, which extends into the pump chamber 17 and is fixed in the region of its free end via further webs 20 on the outside of the first contact piece 12, is fastened via webs 18. In the pump piston 15, on the other hand, there is a recess 21 shaped in the same way as the extension 19, which is intended to receive the extension 19 in the course of the switch-off stroke, as a result of which, as can be seen from FIG "is divided.

Im wesentlichen auf dem Flansch 14 ist eine gesamthafte mit 22 bezeichnete Blasdüse aus einem elektrischen Isoliermaterial befestigt. Diese weist einen Düsenkörper 23 auf, der einen von den Zwischenräumen zwischen den Streben 18 ausgehenden Einlassbereich 24, eine engste Stelle 25 sowie einen sich in der Art eines Diffusors erweiternden Auslassbereich 26 aufweist. Im Einlassbereich 24 ist ausserdem noch eine Trennwand 27 in der Form eines hohlen Kegelstumpfes vorhanden, die den Einlassbereich 24 in zwei voneinander getrennte, jedoch koaxiale und zur engsten Stelle 25 hin konvergierende, mantelförmige Einlasskanäle 24' und 24" (Fig. 2) unterteilt, wobei der Einlasskanal 24' stets mit dem Pumpraum 17' und der Einlasskanal 24" stets mit dem Pumpraum 17" in Verbindung steht. Wie aus der Zeichnung deutlich hervorgeht, ist der Durchlassquerschnitt des Einlasskanals 24' bedeutend geringer als jener des Einlasskanals 24". Dies hat zur Folge, dass sobald im Zuge eines Ausschalthubes der Fortsatz 19 beginnt, in die Vertiefung 21 einzudringen, der Druckanstieg im Pumpraum 17' wegen der geringeren Abströmmöglichkeit momentan grösser ist als im Pumpraum 17". Dadurch werden sich die während des Ausschalthubes besonders im Bereich der engsten Stelle 25 durch die Erhitzung entstehenden, unter hohem Druck stehenden Löschgase - soweit sie nicht durch den Auslassbereich 26 entweichen können - allenfalls nur und auch dies nur momentan in den Pumpraum 17" zurückgedrängt, während die Beblasung des Schaltlichtbogens mit frischem Löschgas aus dem Pumpraum 17' fortgesetzt wird.Essentially on the flange 14, an overall blowing nozzle 22, made of an electrical insulating material, is attached. This has a nozzle body 23 which has an inlet area 24 starting from the spaces between the struts 18, a narrowest point 25 and an outlet area 26 which widens in the manner of a diffuser. In one There is also a partition wall 27 in the form of a hollow truncated cone, which divides the inlet region 24 into two mutually separate, but coaxial and converging towards the narrowest point 25, shell-shaped inlet channels 24 'and 24 "(FIG. 2), whereby the inlet channel 24 'is always in communication with the pump chamber 17' and the inlet channel 24 "is always in communication with the pump chamber 17 " . As can be clearly seen from the drawing, the passage cross section of the inlet channel 24 'is significantly smaller than that of the inlet channel 24 ". This has the consequence that as soon as the extension 19 begins to penetrate into the depression 21 in the course of a switch-off stroke, the pressure increase in the pump chamber 17 'is currently greater than in the pump chamber 17 "because of the lower outflow possibility Area of the narrowest point 25 caused by the heating, high-pressure quenching gases - as far as they cannot escape through the outlet area 26 - at most only and also only temporarily pushed back into the pump chamber 17 " , while the switching arc is blown with fresh quenching gas from the Pump chamber 17 'is continued.

Der Fig. 1 ist zu entnehmen, dass der erste Nennstromkontakt 13 mit einem zweiten, ortsfest angeordneten und ebenfalls rohrförmigem, zweiten Nennstromkontakt 28 zusammenwirkt. In diesem Nennstromkontakt 28 ist über metallische Streben 29 ein ebenfalls metallischer Ring 30 gehaltert, in dem ein zweites, ebenfalls rohrförmiges Kontaktstück 31 längsverschiebbar gelagert ist. Aus der Fig. 1 geht hervor, dass dieses zweite Kontaktstück 31 in Einschaltstellung die Blasdüse 22 an ihrer engsten Stelle 25 praktisch verschliesst und zugleich in das freie Ende des ersten Kontaktstückes 12 eingreift. An dem dem ersten Kontaktstück 12 abgekehrten Ende des zweiten Kontaktstückes 31 ist (in Fig. 1 nur schematisch dargestellt) das eine Ende einer Zugfeder 32 befestigt, deren anderes Ende an einer ortsfesten Stelle 33 im Schalter befestigt ist. Die Zugfeder 32 hat die Tendenz, das zweite Kontaktstück 31 in Fig. 1 nach oben zu ziehen.1 that the first nominal current contact 13 interacts with a second, stationary and also tubular, second nominal current contact 28. In this rated current contact 28, a likewise metallic ring 30 is held via metallic struts 29, in which a second, likewise tubular contact piece 31 is mounted so as to be longitudinally displaceable. 1 that this second contact piece 31 practically closes the blowing nozzle 22 at its narrowest point 25 in the switched-on position and at the same time engages in the free end of the first contact piece 12. On the end of the second contact piece 31 facing away from the first contact piece 12, one end of a tension spring 32 is fastened (only shown schematically in FIG. 1), the other end of which is fastened at a fixed location 33 in the switch. The tension spring 32 tends to pull the second contact piece 31 upwards in FIG. 1.

An der Mantelfläche des zweiten Kontaktstükkes 31 sind mehrere, in gleichmässigen Winkelabständen verteilte Lageraugen 34 vorhanden. An jedem Lagerauge 34 ist das eine Ende eines zweiarmigen Hebels 35 angelenkt, der seinerseits um einen Schwenkzapfen 36 in einem jeweils an einer Strebe 29 angeformten Lagerauge 37 verschwenkbar ist. Das andere Ende jedes der zweiarmigen Hebel 35 ist bei 38 an das eine Ende einer Schwinge 39 angelenkt. Das andere Ende jeder Schwinge 39 ist an einem Lagerauge 40 angelenkt, das auf der der Blasdüse abgekehrten Seite eines Abschirmkörpers 41 aus Blech verankert ist.On the lateral surface of the second contact piece 31 there are a plurality of bearing eyes 34 distributed at uniform angular intervals. On each bearing eye 34, one end of a two-armed lever 35 is articulated, which in turn can be pivoted about a pivot pin 36 in a bearing eye 37 formed in each case on a strut 29. The other end of each of the two-armed levers 35 is articulated at 38 to one end of a rocker 39. The other end of each rocker 39 is articulated on a bearing eye 40 which is anchored on the side of a shielding body 41 made of sheet metal facing away from the blowing nozzle.

Dieser Abschirmkörper 41 besitzt an seinem Umfang einen in Richtung zum Hebel 35 hin umgebogenen Rand 42, der - zumindest in seiner vorgeschobenen Stellung gemäss Fig. 2 und 3 - in elektrischem Kontakt mit den Kontaktflächen des zweiten Nennstromkontaktes 28 steht. Ausserdem besitzt dieser Abschirmkörper 41 in seiner Mitte einen etwa trichterförmig von der Blasdüse 22 weg divergierenden Durchlass 43, der, wie aus Fig. 1 ersichtlich, in Einschaltstellung durch den auslassseitigen Bereich des Düsenkörpers 23 praktisch verschlossen ist. An der Aussenseite des Düsenkörpers 23 ist ausserdem eine Schulter 44 ausgebildet, die dazu dient, beim Einschalthub, d.h. beim Übergang von der in Fig. 3 in die in Fig. 1 dargestellte Stellung, mit der der Blasdüse 22 zugekehrten Stirnseite 45 (Fig. 2,3) des Abschirmkörpers 41 zusammenzuwirken und damit den Abschirmkörper 41 längs des zweiten Kontaktstückes 31 zurück zu verschieben.This shielding body 41 has on its circumference an edge 42 bent towards the lever 35, which - at least in its advanced position according to FIGS. 2 and 3 - is in electrical contact with the contact surfaces of the second nominal current contact 28. In addition, this shielding body 41 has in its center an approximately funnel-shaped passage 43 which, as can be seen in FIG. 1, is practically closed in the switched-on position by the area of the nozzle body 23 on the outlet side. On the outside of the nozzle body 23, a shoulder 44 is also formed, which is used during the switch-on stroke, i.e. during the transition from the position shown in FIG. 3 to the position shown in FIG. 1, to cooperate with the end face 45 (FIG. 2, 3) of the shielding body 41 facing the blowing nozzle 22 and thus to move the shielding body 41 back along the second contact piece 31.

Bei einem Ausschalthub, also wenn sich die Bestandteile 12 bis 27 und 44 von den übrigen Bestandteilen entfernen, läuft der Abschirmkörper 41 unter der Wirkung der über die Hebel 35 auf ihn wirkenden Zugfeder 32 des zweiten Kontaktstücks 31 nach und gleichzeitig zieht sich auch das zweite Kontaktstück 31 aus seiner bezüglich des zweiten Nennstromkontaktes 28 vorgeschobenen Stellung in diesen zurück. In Fig. 2 ist die vorgeschobene Endlage des Abschirmkörpers 41 und zugleich die zurückgezogene Endlage des zweiten Kontaktstückes 31 gezeigt, wobei diese Endlage durch nicht näher dargestellte Anschläge definiert sein kann.In the case of a switch-off stroke, that is to say when the components 12 to 27 and 44 move away from the other components, the shielding body 41 runs under the action of the tension spring 32 acting on the lever 35 of the second contact piece 31, and at the same time the second contact piece also pulls 31 from its position advanced in relation to the second rated current contact 28. 2 shows the advanced end position of the shielding body 41 and, at the same time, the retracted end position of the second contact piece 31, which end position can be defined by stops, not shown in detail.

Aus dem Gesagten ergibt sich, dass bei dem beschriebenen Schalter 10 zumindest am Anfang des Ausschalthubes die Zunahme der Trenndistanz zwischen den Kontaktstücken 12 und 31 erheblich grösser ist als der vom direkt angetriebenen Kontaktstück 12 tatsächlich zurückgelegte Weg.It follows from what has been said that, in the switch 10 described, at least at the beginning of the switch-off stroke, the increase in the separation distance between the contact pieces 12 and 31 is considerably greater than the distance actually traveled by the directly driven contact piece 12.

Das Verhältnis des Verschiebeweges des Abschirmkörpers 41 und des (gegenläufigen) Weges des zweiten Kontaktstückes 31 hängt vom «Übersetzungsverhältnis» der Hebel 35 ab.The ratio of the displacement path of the shielding body 41 and the (opposite) path of the second contact piece 31 depends on the “transmission ratio” of the levers 35.

Für den Abschirmkörper 41, dem in erster Linie die Funktion zukommt, bei einem Ausschalthub so schnell als möglich das elektrische Feld am Ende der Kontaktstücke 28 bzw. 31 zu vergleichmässigen, d.h. in die Stellung gem. Fig. 2 zu gelangen, kann ein vergleichsweise geringer Verschiebeweg ausreichen. Dagegen ist es zweckmässig, einen verhältnismässig grösseren Verschiebeweg für das zweite Kontaktstück 31 vorzusehen, damit der Schaltlichtbogen möglichst schnell in die Länge gezogen wird, um die Löschung zu begünstigen.For the shielding body 41, which primarily has the function of making the electrical field at the end of the contact pieces 28 and 31 as uniform as possible, i.e. in the position acc. 2, a comparatively small displacement path can be sufficient. On the other hand, it is expedient to provide a relatively larger displacement path for the second contact piece 31, so that the switching arc is drawn out as quickly as possible in order to promote the quenching.

Claims (8)

1. Gas-blast switch having two coaxially arranged contact elements capable of being brought into and out of engagement with one another by axial movement, the first contact element being connected with drive means and having associated thereto in a fixed relative position ahead of the first contact element a blast nozzle, the inlet of which being in flow-communication with a compression chamber for a quenching gas, the compression chamber being pressurized during a cut-off stroke of the switch, the second contact element engaging with the blast nozzle in the switch-on position and being surrounded by a screening body which is displaceable in the course of a switch-on stroke by means of the blast nozzle and against the action of a spring out of a forwardly advanced position in the cut-off position of the switch, characterized in that the sceening body (41) and the second contact element (31) are couplet to one another for opposite movement.
2. Gas-blast switch according to claim 1, characterized in that the screening body (41) and the second contact element are coupled to one another by a leverage (35, 38).
3. Gas-blast switch according to claim 2, characterized in that the ratio of transmission of the leverage (35, 38) is such that the path of displacement of the screening body (41) is shorter than that of the second contact element (31).
4. Gas-blast switch according to one of the claims 1, 2 or 3, characterized in that said spring (32) engages at the second contact element (31). 5. Gas-blast switch according to claim 4, characterized in that the spring is a tension spring (32) engaging at the second contact element (31) at its end facing away from the first contact element (12).
6. Gas-blast switch according to claim 2 or 3, characterized in that the leverage (35, 38) comprises at least one double-arm lever (35) pivotably mounted on a stationary pivot pin, said double-arm lever (35) being hingedly connected with one of its ends with the second contact element (31) and with its other end with a rocker arm (39) which in turn is hingedly connected to the screening body (41).
7. Gas-blast switch according to claim 1, characterized in that the central opening (43) of the screening body (41) is shaped as a diffusor diverging away from the blast nozzle (22), the outlet portion of which engaging into the diffusor in the switch-on position of the switch.
8. Gas-blast switch according to claim 1 in which the first and the second contact element (12, 31, respectively) are surrounded each by a coaxially arranged power contact (13, 28, respectively), the power contacts being capable of being brought into and out of engagement with one another, characterized in that the screening body (41) is in sliding contact with the power contact (28) surrounding the second contact element (31).
EP80104262A 1979-09-25 1980-07-19 Gas blast switch Expired EP0025833B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80104262T ATE1400T1 (en) 1979-09-25 1980-07-19 GAS SWITCH.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH862679A CH644969A5 (en) 1979-09-25 1979-09-25 Gas pressure switch.
CH8626/79 1979-09-25

Publications (2)

Publication Number Publication Date
EP0025833A1 EP0025833A1 (en) 1981-04-01
EP0025833B1 true EP0025833B1 (en) 1982-07-28

Family

ID=4342812

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80104262A Expired EP0025833B1 (en) 1979-09-25 1980-07-19 Gas blast switch

Country Status (8)

Country Link
US (1) US4378477A (en)
EP (1) EP0025833B1 (en)
JP (1) JPS5654723A (en)
AT (1) ATE1400T1 (en)
CA (1) CA1140190A (en)
CH (1) CH644969A5 (en)
DE (1) DE3060707D1 (en)
ZA (1) ZA805055B (en)

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DE19613569A1 (en) * 1996-04-04 1997-10-09 Asea Brown Boveri Circuit breaker
DE19644624C1 (en) * 1996-10-18 1998-03-26 Siemens Ag High-voltage gas pressure switch with disparate field electrodes
WO1998032142A1 (en) * 1997-01-17 1998-07-23 Siemens Aktiengesellschaft High-voltage power switch with an axially displaceable field electrode
DE19738697C1 (en) * 1997-08-29 1998-11-26 Siemens Ag High voltage load switch with driven counter contact piece
DE19809088C1 (en) * 1998-02-25 1999-09-30 Siemens Ag High-voltage circuit breaker with an insulating nozzle
FR2915310B1 (en) * 2007-04-17 2009-07-10 Areva T & D Sa CIRCUIT BREAKER WITH DOUBLE MOVEMENT CHAMBER AND REVERSE STRUCTURE.
FR2953639B1 (en) 2009-12-09 2012-01-13 Areva T & D Sas HIGH VOLTAGE CIRCUIT BREAKER WITH REMOVABLE SCREEN FOR IMPROVING THE GRADIENT OF FIELD
DE102019214432B4 (en) * 2019-09-23 2024-02-08 Siemens Energy Global GmbH & Co. KG Assembly for a high-voltage circuit breaker and corresponding high-voltage circuit breaker

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US2196008A (en) * 1937-07-06 1940-04-02 Gen Electric Shielded contact construction for circuit breakers
FR948434A (en) * 1947-06-09 1949-08-01 Forges Ateliers Const Electr Self-compressing pneumatic circuit breakers
DE2140284A1 (en) * 1971-08-06 1973-02-15 Siemens Ag ELECTRIC PRESSURE GAS SWITCH
CH554597A (en) * 1973-06-04 1974-09-30 Sprecher & Schuh Ag PRESSURE GAS SWITCH.
FR2273362A1 (en) * 1974-05-31 1975-12-26 Alsthom Cgee High voltage circuit breaker - has fixed contact with semi-mobile contact movable from mobile contact by spring
JPS5185473A (en) * 1975-01-16 1976-07-27 Hitachi Ltd PATSUFUAAGATAGASUSHADANKI
JPS5238173A (en) * 1975-09-22 1977-03-24 Hitachi Ltd Buffer gas breaker
FR2327626A1 (en) * 1975-10-09 1977-05-06 Alsthom Cgee ARC BLOWING ELECTRIC SHUT-OFF DEVICE
FR2344987A1 (en) * 1976-03-15 1977-10-14 Merlin Gerin EARTHING SWITCH FOR HIGH VOLTAGE SHIELDED SUBSTATION
DE2831134C2 (en) * 1978-07-13 1980-08-21 Siemens Ag, 1000 Berlin Und 8000 Muenchen Metal-enclosed, pressurized gas-insulated high-voltage switchgear
JPS5559613A (en) * 1978-10-30 1980-05-06 Tokyo Shibaura Electric Co Gas breaker

Also Published As

Publication number Publication date
CH644969A5 (en) 1984-08-31
EP0025833A1 (en) 1981-04-01
JPS5654723A (en) 1981-05-14
US4378477A (en) 1983-03-29
ATE1400T1 (en) 1982-08-15
ZA805055B (en) 1981-08-26
DE3060707D1 (en) 1982-09-16
CA1140190A (en) 1983-01-25

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