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EP0126929B1 - Pressurised-gas switch - Google Patents

Pressurised-gas switch Download PDF

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Publication number
EP0126929B1
EP0126929B1 EP84104058A EP84104058A EP0126929B1 EP 0126929 B1 EP0126929 B1 EP 0126929B1 EP 84104058 A EP84104058 A EP 84104058A EP 84104058 A EP84104058 A EP 84104058A EP 0126929 B1 EP0126929 B1 EP 0126929B1
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EP
European Patent Office
Prior art keywords
piston
gas
contact member
compression chamber
sparking
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
EP84104058A
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German (de)
French (fr)
Other versions
EP0126929B2 (en
EP0126929A2 (en
EP0126929A3 (en
Inventor
Walter Egli
Klaus Prof. Dr. Ragaller
Ekkehard Dr. Schade
Roland Stelzer
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BBC Brown Boveri AG Switzerland
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BBC Brown Boveri AG Switzerland
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Application filed by BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0126929A2 publication Critical patent/EP0126929A2/en
Publication of EP0126929A3 publication Critical patent/EP0126929A3/en
Application granted granted Critical
Publication of EP0126929B1 publication Critical patent/EP0126929B1/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
    • H01H33/905—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the compression volume being formed by a movable cylinder and a semi-mobile piston

Definitions

  • the switch according to the invention is characterized in that, despite a modest drive for the movable switching element, it has sufficient amounts of extinguishing gas suitable for the extinguishing of large and small switching arcs and is suitable for the size of the switching arc to be extinguished.
  • FIGS. 1, 3 and 4 are shown in the left-hand halves of the figure in the off position and in the right-hand halves of the figure in the on position. The same parts are also provided with the same reference symbols in all switches.
  • the compressed gas switch shown in FIG. 1 has a fixed contact 1 with a nominal current contact 2 and a burn-up contact 3 and a movable contact 4 with a nominal current contact 5 and a burn-off contact 6.
  • the erosion contacts 3 and 6 are nozzle-shaped and are mounted on contact tubes 7 and 8, respectively.
  • the erosion contact 3 of the fixed contact 1 has an outer diameter corresponding approximately to the inside diameter of the nozzle-shaped erosion contact 6 of the movable contact 4, so that the erosion contact 3 can penetrate into the interior of the erosion contact 6 in the switched-on position (shown in the right half of FIG. 1) ).
  • the erosion contact 6 of the movable contact piece 4 is surrounded at a distance by an insulating nozzle 9.
  • the outer surface of the insulating nozzle 9 is limited by the nominal current contact 5.
  • the compression space 13 is of a cylindrical housing 14 made of insulating material, which accommodates the contact pieces 1 and 4. such as made of glass fiber reinforced plastic or porcelain, the contact tube 8, the piston 12 and a further piston 15 limited. Both pistons 12 and 15 can slide in a sealing manner in the axial direction on the inner surface of the housing 14. On the inner surface of the housing 14 there is an annular stop 16, against which the piston 15 bears with its surface facing the compression space 13. A compression spring 17 is supported on the surface of the piston 15 facing away from the compression space 13, the end of which is facing away from the piston 15 is held by a shoulder 18 provided on the inner surface of the housing 14. A stop 19 is provided on the contact tube 8, against which, in the switched-on position, the piston 15 bears with its surface facing away from the compression space 13. In the switched-on position, the piston 15 therefore acts like a solid bottom of the compression space 13.
  • the housing 14 is filled with an insulating gas, such as sulfur hexafluoride, of preferably a few bar pressure.
  • the switching arc clogs the nozzle openings of the erosion contacts 3 and 6 during the high current phase and the pressure of the insulating gas in the compression space 13 is therefore considerably increased by heating.
  • a predeterminable pressure value of the insulating gas located in the compression space 13 which is, for example, 0.5-1 bar higher than the pressure value of the insulating gas in the switch-on position, the piston 15 is displaced downward against the force of the spring 17 and thus the compression space when the gas pressure is increased 13 enlarged (curve section II in FIG. 2) until its volume remains constant due to the piston 15 striking the stop 19 (curve section 111).
  • the switch according to the invention therefore behaves like an arrangement in which the extinguishing gas is stored in a chamber with a constant volume.
  • the drive only requires the force required to tension the spring 17, which is approximately of the same order of magnitude as the force required for the cold gas pressure build-up in the compression space 13.
  • the switch according to the invention therefore behaves like a blow piston switch.
  • the drive only has to exert the force necessary for compressing the insulating gas provided in the compression space 13, but this is low because of the weak insulating gas flows required for successfully blowing the arcs of small currents.
  • the shoulder 18 is attached to the contact tube 8 instead of to the housing 14.
  • the force of the spring 17 is now absorbed by the contact tube 8.
  • the piston 15 can slide into a cylinder 20 in a sealing manner.
  • the cylinder 20 is connected in a suitable manner to a cylinder base 21 fastened to the switching element 4, which is penetrated by the channel 10 entering the compression space 13.
  • the piston 15 is fixed by a stop 22 held in a suitable manner by the housing 14.
  • the stop 22 is held, for example, by a rod 23 which penetrates the piston 15 in a sealing manner and whose end facing away from the stop 22 is mounted on a shoulder 24 fastened to the housing 14.
  • the piston 15 When switching large currents, the piston 15 is removed from the stop 22 against the force of the spring 17 after the separation of the erosion contacts 3 and 6, as in the embodiments described above. Here he temporarily occupies the position shown in dashed lines in the left half of FIG. 4. According to the embodiment according to FIG. 3, the drive of the switching element 4 is considerably relieved in this switch when large currents are switched off.
  • this switch has the advantage that the use of a cylinder connected to the switching element 4 saves a piston and the compression space 13 can be designed independently of the housing 14.

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  • Circuit Breakers (AREA)

Description

Es ist Aufgabe der Erfindung, einen Schalter der gattungsgemässen Art zu schaffen, welcher bei einem vergleichsweise schwach dimensionierten und einfach ausgebildeten Antrieb des beweglichen Schaltstückes sowohl kleine als auch grosse Ströme mit Sicherheit unterbrechen kann.It is an object of the invention to provide a switch of the generic type which can interrupt both small and large currents with certainty with a comparatively weakly dimensioned and simply designed drive of the movable switching element.

Diese Aufgabe wird durch die im kennzeichnenden Teil von Patentanspruch 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing part of patent claim 1.

Der erfindungsgemässe Schalter zeichnet sich dadurch aus, dass er trotz eines bescheiden gehaltenen Antriebs für das bewegliche Schaltstück sowohl für das Löschen grosser als auch kleiner Schaltlichtbögen über ausreichende und an die Grösse des zu löschenden Schaltlichtbogens angepasste Mengen an Löschgas geeigneten Druckes verfügt.The switch according to the invention is characterized in that, despite a modest drive for the movable switching element, it has sufficient amounts of extinguishing gas suitable for the extinguishing of large and small switching arcs and is suitable for the size of the switching arc to be extinguished.

Nachfolgend sind Ausführungsbeispiele des Erfindungsgegenstandes anhand der Zeichnung dargestellt.Exemplary embodiments of the subject matter of the invention are shown below with reference to the drawing.

Es zeigt:

  • Fig. 1 eine Aufsicht auf einen Schnitt durch eine erste Ausführungsform des erfindungsgemässen Druckgasschalters,
  • Fig. 2 ein Diagramm, in dem das Volumen V des Kompressionsraumes in Funktion des Hubes h des beweglichen Schaltstückes angegeben ist,
  • Fig. 3 eine Aufsicht auf einen Schnitt durch eine zweite Ausführungsform des erfindungsgemässen Druckgasschalters, und
  • Fig. 4 eine Aufsicht auf einen Schnitt durch eine dritte Ausführungsform des erfindungsgemässen Druckgasschalters.
It shows:
  • 1 is a plan view of a section through a first embodiment of the pressure gas switch according to the invention,
  • 2 is a diagram in which the volume V of the compression space is given as a function of the stroke h of the movable contact piece,
  • 3 is a plan view of a section through a second embodiment of the compressed gas switch according to the invention, and
  • Fig. 4 is a plan view of a section through a third embodiment of the pressure gas switch according to the invention.

Die in den Fig. 1, 3 und 4 dargestellten erfindungsgemässen Druckgasschalter sind in den linken Figurenhälften jeweils in der Ausschalt-und in den rechten Figurenhälften jeweils in der Einschaltstellung dargestellt. Bei allen Schaltern sind gleiche Teile auch mit gleichen Bezugszeichen versehen.The pressure gas switches according to the invention shown in FIGS. 1, 3 and 4 are shown in the left-hand halves of the figure in the off position and in the right-hand halves of the figure in the on position. The same parts are also provided with the same reference symbols in all switches.

Der in Fig. 1 dargestellte Druckgasschalter weist ein feststehendes Schaltstück 1 mit einem Nennstromkontakt 2 und einem Abbrandkontakt 3 sowie ein bewegliches Schaltstück 4 mit einem Nennstromkontakt 5 und einem Abbrandkontakt 6 auf. Die Abbrandkontakte 3 und 6 sind düsenförmig ausgebildet und jeweils auf Kontaktrohren 7 und 8 angebracht. Der Abbrandkontakt 3 des feststehenden Schaltstückes 1 weist einen etwa dem Innendurchmesser des düsenförmig ausgebildeten Abbrandkontaktes 6 des beweglichen Schaltstückes 4 entsprechenden Aussendurchmesser auf, so dass der Abbrandkontakt 3 in der Einschaltstellung ins Innere des Abbrandkontaktes 6 eindringen kann (in der rechten Hälfte von Fig. 1 dargestellt).The compressed gas switch shown in FIG. 1 has a fixed contact 1 with a nominal current contact 2 and a burn-up contact 3 and a movable contact 4 with a nominal current contact 5 and a burn-off contact 6. The erosion contacts 3 and 6 are nozzle-shaped and are mounted on contact tubes 7 and 8, respectively. The erosion contact 3 of the fixed contact 1 has an outer diameter corresponding approximately to the inside diameter of the nozzle-shaped erosion contact 6 of the movable contact 4, so that the erosion contact 3 can penetrate into the interior of the erosion contact 6 in the switched-on position (shown in the right half of FIG. 1) ).

Der Abbrandkontakt 6 des beweglichen Schaltstückes 4 ist mit Abstand von einer Isolierstoffdüse 9 umgeben. Die Aussenfläche der Isolierstoffdüse 9 ist vom Nennstromkontakt 5 begrenzt. Die Innenfläche der Isolierstoffdüse 9 begrenzt zusammen mit den Aussenflächen von Kontaktrohr 8 und Abbrandkontakt 6 einen ringförmigen Kanal 10, welcher sich durch einen mittels Stegen 11 am Kontaktrohr 8 befestigten Ringkolben 12 erstreckt. Der Kanal 10 verbindet in der Ausschaltstellung (rechte Hälfte von Fig. 1) die zwischen beiden Abbrandkontakten 3 und 6 gelegene Zone, in welcher während eines Schaltvorganges ein zwischen den Abbrandkontakten 3 und 6 gezogener Schaltlichtbogen brennt, mit einem Kompressionsraum 13.The erosion contact 6 of the movable contact piece 4 is surrounded at a distance by an insulating nozzle 9. The outer surface of the insulating nozzle 9 is limited by the nominal current contact 5. The inner surface of the insulating material nozzle 9, together with the outer surfaces of the contact tube 8 and the erosion contact 6, delimits an annular channel 10 which extends through an annular piston 12 fastened to the contact tube 8 by means of webs 11. In the switched-off position (right half of FIG. 1), the channel 10 connects the zone located between the two erosion contacts 3 and 6, in which a switching arc drawn between the erosion contacts 3 and 6 burns with a compression space 13.

Der Kompressionsraum 13 ist von einem die Schaltstücke 1 und 4 aufnehmenden zylinderförmigen Gehäuse 14 aus Isolierstoff. wie etwa aus glasfaserverstärktem Kunststoff oder Porzellan, dem Kontaktrohr 8, dem Kolben 12 sowie einem weiteren Kolben 15 begrenzt. Beide Kolben 12 und 15 können in dichtender Weise in axialer Richtung auf der Innenfläche des Gehäuses 14 gleiten. Auf der Innenfläche des Gehäuses 14 ist ein ringförmiger Anschlag 16 angebracht, an dem der Kolben 15 mit seiner dem Kompressionsraum 13 zugewandten Fläche anliegt. Auf der vom Kompressionsraum 13 abgewandten Fläche des Kolbens 15 stützt sich eine Druckfeder 17 ab, deren vom Kolben 15 abgewandtes Ende von einem an der Innenfläche des Gehäuses 14 vorgesehenen Ansatz 18 gehalten ist. Am Kontaktrohr 8 ist ein Anschlag 19 vorgesehen, an dem in der Einschaltstellung der Kolben 15 mit seiner vom Kompressionsraum 13 abgewandten Fläche anliegt. Der Kolben 15 wirkt daher in der Einschaltstellung wie ein fester Boden des Kompressionsraumes 13. Das Gehäuse 14 ist mit einem Isoliergas, wie etwa Schwefelhexafluorid, von vorzugsweise einigen bar Druck gefüllt.The compression space 13 is of a cylindrical housing 14 made of insulating material, which accommodates the contact pieces 1 and 4. such as made of glass fiber reinforced plastic or porcelain, the contact tube 8, the piston 12 and a further piston 15 limited. Both pistons 12 and 15 can slide in a sealing manner in the axial direction on the inner surface of the housing 14. On the inner surface of the housing 14 there is an annular stop 16, against which the piston 15 bears with its surface facing the compression space 13. A compression spring 17 is supported on the surface of the piston 15 facing away from the compression space 13, the end of which is facing away from the piston 15 is held by a shoulder 18 provided on the inner surface of the housing 14. A stop 19 is provided on the contact tube 8, against which, in the switched-on position, the piston 15 bears with its surface facing away from the compression space 13. In the switched-on position, the piston 15 therefore acts like a solid bottom of the compression space 13. The housing 14 is filled with an insulating gas, such as sulfur hexafluoride, of preferably a few bar pressure.

Beim Ausschalten wird das durch einen nicht dargestellten Antrieb in Richtung des in der rechten Hälfte von Fig. 1 angegebenen Pfeils, d.h. nach unten, bewegt. Hierbei öffnen zunächst die Nennstromkontakte 2 und 5 und wird der abzuschaltende Strom in einen das Kontaktrohr 7, den Abbrandkontakt 3, den Abbrandkontakt 6 und das Kontaktrohr 8 aufweisenden Strompfad kommutiert. Einige msec später wird der Eingriff zwischen den Abbrandkontakten 3 und 6 aufgehoben und zwischen diesen Kontakten ein nicht dargestellter Schaltlichtbogen gezündet.When switching off, this is indicated by a drive, not shown, in the direction of the arrow indicated in the right half of FIG. down, moved. First, the nominal current contacts 2 and 5 open and the current to be switched off is commutated into a current path having the contact tube 7, the erosion contact 3, the erosion contact 6 and the contact tube 8. A few msec later, the engagement between the erosion contacts 3 and 6 is canceled and a switching arc (not shown) is ignited between these contacts.

Da durch die gleichzeitig erfolgende Abwärtsbewegung des Kolbens 12 der Druck des im Kompressionsraum 13 eingeschlossenen Isoliergases erhöht wird, strömt bei der Kontakttrennung Druckgas aus dem Raum 13 über den Kanal 10 in die Zone zwischen den beiden Abbrandkontakten 3 und 6, wodurch eine Beblasung des Schaltlichtbogens erfolgt. Das zuströmende Gas wird nach der Beblasung über die düsenförmig ausgebildeten Abbrandkontakte 3 und 6 und die Kontaktrohre 7 und 8 sowie über die Isolierstoffdüse 9 in einen Expansionsraum abgeführt. Die Feder 17 ist hierbei derart bemessen, dass der Kolben 15 zumindest bis zum Zeitpunkt der Trennung der Abbrandkontakte 3 und 6 trotz zunehmenden Drucks des im Kompressionsraum 13 befindlichen Isoliergases gegen den Anschlag 16 gepresst ist.Since the simultaneous downward movement of the piston 12 increases the pressure of the insulating gas enclosed in the compression space 13, compressed gas flows from the space 13 through the channel 10 into the zone between the two arcing contacts 3 and 6 during the contact separation, as a result of which the switching arc is blown . After blowing, the inflowing gas is discharged into an expansion space via the nozzle-shaped erosion contacts 3 and 6 and the contact tubes 7 and 8 and via the insulating material nozzle 9. The spring 17 is dimensioned in such a way that the piston 15 at least until the point at which the erosion contacts 3 are separated and 6 is pressed against the stop 16 despite increasing pressure of the insulating gas located in the compression space 13.

Dieser Sachverhalt ist auch aus Fig. 2 entnehmbar, in der das Volumen V des Kompressionsraumes 13 in Funktion des Hubes h des Schaltstückes 4 dargestellt ist. In der Einschaltstellung, d.h. beim Hub 0, weist der Kompressionsraum 13 noch das Volumen VE auf. Mit zunehmendem Hub h wird das Volumen V des Kompressionsraumes 13 kleiner (Kurvenabschnitt I) und ist bei der Trennung der Abbrandkontakte 3 und 6 (Hub KT) auf das Volumen VKT verringert worden. Gleichzeitig ist der Druck des im Kompressionsraum 13 befindlichen Isoliergases entsprechend vergrössert worden.This fact can also be seen in FIG. 2, in which the volume V of the compression space 13 is shown as a function of the stroke h of the switching element 4. In the switched-on position, ie at stroke 0, the compression space 13 still has the volume V E. With increasing stroke h, the volume V of the compression space 13 becomes smaller (curve section I) and has been reduced to the volume V KT when the erosion contacts 3 and 6 (stroke KT) are separated. At the same time, the pressure of the insulating gas located in the compression space 13 has been increased accordingly.

Erfolgt nun die Kontakttrennung bei grossen abzuschaltenden Strömen, so verstopft der Schaltlichtbogen während der Hochstromphase die Düsenöffnungen der Abbrandkontakte 3 und 6 und wird daher der Druck des im Kompressionsraum 13 befindlichen Isoliergases durch Aufheizen erheblich erhöht. Oberhalb eines vorgebbaren Druckwertes des im Kompressionsraum 13 befindlichen Isoliergases, welcher beispielsweise 0,5 - 1 bar höher ist als der Druckwert des Isoliergases in der Einschaltstellung, wird der Kolben 15 gegen die Kraft der Feder 17 nach unten verschoben und dadurch bei erhöhtem Gasdruck der Kompressionsraum 13 solange vergrössert (Kurvenabschnitt II in Fig. 2), bis sein Volumen bedingt durch das Anschlagen des Kolbens 15 am Anschlag 19 konstant bleibt (Kurvenabschnitt 111). Bei Annäherung des Stromes an den Nulldurchgang fällt der Druck wieder ab, da der Schaltlichtbogen die Öffnungen der Abbrandkontakte 3 und 6 wieder freigibt. Zur Beblasung der zwischen beiden Abbrandkontakten 3 und 6 befindlichen Lichtbogenzone steht dann das maximale Volumen VE des Kompressionsraumes 13 zur Verfügung. Bei grossen abzuschaltenden Strömen verhält sich der erfindungsgemässe Schalter daher wie eine Anordnung, bei der das Löschgas in einer Kammer mit konstantem Volumen gespeichert ist. Der Antrieb benötigt hierbei lediglich die zum Spannen der Feder 17 notwendige Kraft, welche etwa in der gleichen Grössenordnung liegt wie die für den Kaltgas-Druckaufbau im Kompressionsraum 13 notwendige Kraft.If the contact is separated at high currents to be switched off, the switching arc clogs the nozzle openings of the erosion contacts 3 and 6 during the high current phase and the pressure of the insulating gas in the compression space 13 is therefore considerably increased by heating. Above a predeterminable pressure value of the insulating gas located in the compression space 13, which is, for example, 0.5-1 bar higher than the pressure value of the insulating gas in the switch-on position, the piston 15 is displaced downward against the force of the spring 17 and thus the compression space when the gas pressure is increased 13 enlarged (curve section II in FIG. 2) until its volume remains constant due to the piston 15 striking the stop 19 (curve section 111). When the current approaches the zero crossing, the pressure drops again, since the switching arc releases the openings of the erosion contacts 3 and 6 again. The maximum volume V E of the compression space 13 is then available for blowing the arcing zone located between the two arcing contacts 3 and 6. With large currents to be switched off, the switch according to the invention therefore behaves like an arrangement in which the extinguishing gas is stored in a chamber with a constant volume. The drive only requires the force required to tension the spring 17, which is approximately of the same order of magnitude as the force required for the cold gas pressure build-up in the compression space 13.

Erfolgt die Kontakttrennung nun bei kleinen abzuschaltenden Strömen, so reicht die Kraft des durch den Schaltlichtbogen nur geringfügig aufgeheizten Isoliergases nicht aus, um einen zum Verschieben des Kolbens 15 ausreichenden Druck im Kompressionsraum 13 aufzubauen. Das Volumen VKT wird nach der Kontakttrennung weiter abnehmen (Kurvenabschnitt IV in Fig. 2). Bei kleinen abzuschaltenden Strömen verhält sich der erfindungsgemässe Schalter daher wie ein Blaskolbenschalter. Der Antrieb muss hierbei lediglich die zur Kompression des im Kompressionsraum 13 vorgesehenen Isoliergases notwendige Kraft aufbringen, welche aber wegen der zur erfolgreichen Beblasung der Lichtbögen kleiner Ströme erforderlichen schwachen Isoliergasströmungen gering ist.If the contact separation now takes place with small currents to be switched off, the force of the insulating gas which is only slightly heated by the switching arc is not sufficient to build up a sufficient pressure in the compression space 13 to move the piston 15. The volume V KT will decrease further after the contact separation (curve section IV in Fig. 2). In the case of small currents to be switched off, the switch according to the invention therefore behaves like a blow piston switch. The drive only has to exert the force necessary for compressing the insulating gas provided in the compression space 13, but this is low because of the weak insulating gas flows required for successfully blowing the arcs of small currents.

Bei der Ausbildung des erfindungsgemässen Druckgasschalters gemäss Fig. 3 ist der Ansatz 18 statt am Gehäuse 14 am Kontaktrohr 8 angebracht. Die Kraft der Feder 17 wird nun vom Kontaktrohr 8 aufgenommen. Bei diesem Schalter wird daher beim Ausschalten grosser Ströme die Kraft des nach der Trennung der Abbrandkontakte 3 und 6 infolge Aufheizens durch den Schaltlichtbogen bewegten Kolbens 15 über die Feder 17 auf das Kontaktrohr 8 übertragen, wodurch ein Spannen der Feder 17 bewirkt und somit der Antrieb noch zusätzlich unterstützt wird.3, the shoulder 18 is attached to the contact tube 8 instead of to the housing 14. The force of the spring 17 is now absorbed by the contact tube 8. With this switch, when large currents are switched off, the force of the piston 15, which is moved after the separation of the erosion contacts 3 and 6 as a result of heating by the switching arc, is transmitted via the spring 17 to the contact tube 8, which causes tensioning of the spring 17 and thus the drive is additionally supported.

Bei der Ausführungsform gemäss Fig. 4 kann der Kolben 15 in dichtender Weise in einen Zylinder 20 gleiten. Der Zylinder 20 ist in geeigneter Weise mit einem am Schaltstück 4 befestigten Zylinderboden 21 verbunden, welcher von dem in den Kompressionsraum 13 einlaufenden Kanal 10 durchsetzt ist. In der Einschaltstellung (rechte Hälfte von Fig. 4) ist der Kolben 15 durch einen in geeigneter Weise vom Gehäuse 14 gehaltenen Anschlag 22 fixiert. Die Halterung des Anschlages 22 erfolgt beispielsweise durch eine den Kolben 15 in dichtender Weise durchsetzende Stange 23, deren vom Anschlag 22 abgewandtes Ende auf einem am Gehäuse 14 befestigten Ansatz 24 gelagert ist.In the embodiment according to FIG. 4, the piston 15 can slide into a cylinder 20 in a sealing manner. The cylinder 20 is connected in a suitable manner to a cylinder base 21 fastened to the switching element 4, which is penetrated by the channel 10 entering the compression space 13. In the switched-on position (right half of FIG. 4), the piston 15 is fixed by a stop 22 held in a suitable manner by the housing 14. The stop 22 is held, for example, by a rod 23 which penetrates the piston 15 in a sealing manner and whose end facing away from the stop 22 is mounted on a shoulder 24 fastened to the housing 14.

Beim Schalten grosser Ströme wird der Kolben 15 nach dem Trennen der Abbrandkontakte 3 und 6 wie bei den vorstehend bezeichneten Ausführungsformen gegen die Kraft der Feder 17 vom Anschlag 22 entfernt. Hierbei nimmt er vorübergehend die in der linken Hälfte von Fig. 4 gestrichelt dargestellte Position ein. Entsprechend der Ausführungsform gemäss der Fig. 3 ist auch bei diesem Schalter der Antrieb des Schaltstückes 4 beim Ausschalten grosser Ströme erheblich entlastet. Darüber hinaus weist dieser Schalter noch den Vorteil auf, dass durch die Verwendung eines mit dem Schaltstück 4 verbundenen Zylinders ein Kolben eingespart wird und der Kompressionsraum 13 unabhängig vom Gehäuse 14 gestaltet werden kann.When switching large currents, the piston 15 is removed from the stop 22 against the force of the spring 17 after the separation of the erosion contacts 3 and 6, as in the embodiments described above. Here he temporarily occupies the position shown in dashed lines in the left half of FIG. 4. According to the embodiment according to FIG. 3, the drive of the switching element 4 is considerably relieved in this switch when large currents are switched off. In addition, this switch has the advantage that the use of a cylinder connected to the switching element 4 saves a piston and the compression space 13 can be designed independently of the housing 14.

Claims (6)

1. Gas-blast circuit breaker with two contact members (1, 4), which are movable relative to one another and are each provided with a sparking contact (3, 6), with a cylindrical compression chamber (13), for generating pressurised gas, which is variable by the movement of one movable contact member (4) of the two contact members (1, 4), one end face of which contains an annular channel (10) and the other end face of which is bounded by a piston (15) which is displaceable along the cylinder axis of the compression chamber (13) and is subject to the action of a pretensioned spring (17), and with a nozzle (9) of insulating material surrounding the sparking contact (6) of the movable contact member (4) at a distance, the inner surface of the nozzle defining, together with the outer surface of the sparking contact (6) of the mowable contact member (4), an annular channel (10), the annular channel (10) being closed in the make-position and, on breaking after separation of the sparking contacts (3, 6) and ignition of a switching arc in a zone formed between the separating sparking contacts (3, 6), making a connection between the compression chamber (13) and this zone, characterized in that the piston (15) is held in the make-position by a fixed stop (16; 22) absorbing the force of the pretensioned spring (17), and in that the spring (17) is sized in such a way that, on breaking at least up to the time of separation of the sparking contacts (3, 6), the piston (15) is taken to the stop (16; 22) against the action of a precompression, called first pressure value, of the pressurised gas present in the compression chamber (13), caused by the break movement of the movable sparking contact (4).
2. Gas-blast circuit breaker according to claim 1, characterized in that the end, remote from the piston (15), of the spring (17) is supported on the movable contact member (4).
3. Gas-blast circuit breaker according to claim 1, characterized in that the end, remote from the piston (15), of the spring (17) is supported on a fixed housing (14).
4. Gas-blast circuit breaker according to one of Patent Claims 1 to 3, characterized in that, on the movable contact member (4), a stop (19) is provided which, above a second pressure value, greater than the first pressure value, of the pressurised gas present in the compression chamber (13), blocks the movement of the piston (15) in the direction of the movement of the contact member (4) which is moved on switching- off.
5. Gas-blast circuit breaker according to one of Patent Claims 1 to 4, characterized in that the compression chamber (13) is bounded by the piston (15) and a cylinder (20) connected to the movable contact member (4).
6. Gas-blast circuit breaker according to one of Patent Claims 1 to 4, characterized in that the compression chamber (13) is bounded by the piston (15), a fixed cylinder (housing 14) and a second piston (12) connected to the movable contact member (4).
EP84104058A 1983-05-31 1984-04-11 Pressurised-gas switch Expired - Lifetime EP0126929B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2968/83 1983-05-31
CH296883 1983-05-31

Publications (4)

Publication Number Publication Date
EP0126929A2 EP0126929A2 (en) 1984-12-05
EP0126929A3 EP0126929A3 (en) 1986-07-09
EP0126929B1 true EP0126929B1 (en) 1989-08-02
EP0126929B2 EP0126929B2 (en) 1993-06-23

Family

ID=4245694

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104058A Expired - Lifetime EP0126929B2 (en) 1983-05-31 1984-04-11 Pressurised-gas switch

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US (1) US4556767A (en)
EP (1) EP0126929B2 (en)
JP (1) JPH0664975B2 (en)
DE (2) DE3322597A1 (en)

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FR2660792B1 (en) * 1990-04-04 1992-06-12 Alsthom Gec HIGH OR MEDIUM VOLTAGE CIRCUIT BREAKER WITH ARC-TO-END CONTACTORS.
DE4025553C2 (en) * 1990-08-11 1994-03-10 Licentia Gmbh Gas pressure switch
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DE4402935A1 (en) * 1994-02-01 1995-08-03 Abb Patent Gmbh Contact system for a high-voltage circuit breaker
GB9601075D0 (en) * 1996-01-19 1996-03-20 Alliedsignal Ltd Pretensioner
FR2748598B1 (en) * 1996-05-13 1998-06-05 Gec Alsthom T & D Sa HIGH-VOLTAGE SELF-BLOWING CIRCUIT BREAKER
FR2756413B1 (en) * 1996-11-28 1998-12-31 Gec Alsthom T & D Sa SEMI-MOBILE PISTON CIRCUIT BREAKER
FR2761520B1 (en) * 1997-03-27 1999-05-14 Gec Alsthom T & D Sa LOW-ENERGY LOW-ENERGY MEDIUM VOLTAGE CIRCUIT BREAKER
JP2008210710A (en) * 2007-02-27 2008-09-11 Mitsubishi Electric Corp Gas-blast circuit breaker for power
FR2957451A1 (en) * 2010-03-09 2011-09-16 Areva T & D Sas HIGH VOLTAGE ELECTRIC SWITCH WITH CLOSURE RETURN AND DEVICE FOR INSERTING RESISTANCE
KR101786521B1 (en) * 2013-07-02 2017-10-18 엘에스산전 주식회사 High Voltage Gas Circuit Breaker

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Also Published As

Publication number Publication date
US4556767A (en) 1985-12-03
DE3479265D1 (en) 1989-09-07
EP0126929B2 (en) 1993-06-23
EP0126929A2 (en) 1984-12-05
JPS59228328A (en) 1984-12-21
DE3322597A1 (en) 1984-12-06
EP0126929A3 (en) 1986-07-09
JPH0664975B2 (en) 1994-08-22

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