EP0601672B1 - Load break switch for medium voltage with a vacuum switch tube - Google Patents

Load break switch for medium voltage with a vacuum switch tube Download PDF

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Publication number
EP0601672B1
EP0601672B1 EP93250283A EP93250283A EP0601672B1 EP 0601672 B1 EP0601672 B1 EP 0601672B1 EP 93250283 A EP93250283 A EP 93250283A EP 93250283 A EP93250283 A EP 93250283A EP 0601672 B1 EP0601672 B1 EP 0601672B1
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EP
European Patent Office
Prior art keywords
isolating contact
contact piece
switching tube
drive device
switch
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
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EP93250283A
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German (de)
French (fr)
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EP0601672A1 (en
Inventor
Reinhold Lindner
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Siemens AG
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Siemens AG
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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
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H33/121—Load break switches
    • H01H33/125—Load break switches comprising a separate circuit breaker
    • H01H33/128—Load break switches comprising a separate circuit breaker being operated by a separate mechanism interlocked with the sectionalising mechanism

Definitions

  • the invention relates to a load-break switch for medium voltage with a fixed isolating contact piece and a pivotably arranged movable isolating contact piece and with a supporting insulator for the stationary and for the movable isolating contact piece, furthermore with an electrically in series with the isolating contact pieces, serving as a load switching device, the vacuum interrupter which Switching on the switch disconnector after closing the isolating contact pieces is closed and opened when switching off before opening the isolating contact pieces, and with a support base for the support insulators and the vacuum interrupter.
  • a switch disconnector of the type mentioned is known from DE-C-29 34 776.
  • the actuation of the vacuum interrupter serving as a load switching device inevitably takes place by means of a guide slot and a wedge bevel.
  • This method of operation requires that the drive device for the movable isolating contact piece not only has to apply the drive energy for closing and opening the isolating path, but also the drive energy for the vacuum interrupter.
  • the known type of switch disconnector is not applicable in cases where the discharge of the disconnecting knife in switched off state is undesirable due to space requirements.
  • the object of the invention is to create a switch disconnector with a relatively small installation space, which can be manufactured using tried-and-tested modules and which achieves a long mechanical service life by separating the disconnection and load switching functions.
  • this object is achieved in a switch disconnector of the type mentioned in that the vacuum interrupter has its own drive device with a storage spring and that a switching shaft provided for actuating the movable isolating contact piece is coupled to a tension shaft of the drive device of the vacuum interrupter in such a way that the storage spring the drive device of the vacuum interrupter is tensioned by the switch-on movement of the movable isolating contact piece and relaxed by the switch-off movement and that the drive device of the vacuum interrupter can be released arbitrarily.
  • the use of a separate drive device for the vacuum interrupter means that the movable isolating contact piece does not have to be switched on in the power transmission to the vacuum interrupter.
  • similar drive devices can be used as are known for circuit breakers.
  • the movable isolating contact piece on the other hand, only requires a simple manual drive because the isolating section is always disconnected from the power supply due to the series connection with the vacuum interrupter.
  • a faulty switching sequence of the isolating contacts and the vacuum interrupter is precluded by the fact that the storage spring of the drive device of the vacuum interrupter is tensioned by the switch-on movement of the movable isolating contact piece. If the isolating section is opened again after closing, the storage spring for the vacuum interrupter is also released so that the interrupter cannot be closed when the isolating section is open.
  • isolating switches of the type with vibration supports can be used within the scope of the invention. This can be done in the context of the invention in that a further support insulator to be actuated by means of the switch shaft as the carrier of the movable isolating contact piece and a third and fourth support insulator as a carrier of the vacuum interrupter, an associated pole drive unit and a connecting device of the switch disconnector are arranged on the support base.
  • the aforementioned tension and relaxation of the storage spring of the drive device of the vacuum interrupter by the switch-on movement of the movable isolating contact piece can be achieved in a simple manner in that a tensioning shaft is rotatably mounted in the support base in parallel position to the switch shaft for the drive device of the vacuum interrupter, that on the switch shaft and a crank arm is attached to the tension shaft and that the crank arms are coupled to one another.
  • the drive device of the vacuum interrupter is arranged in the support base and an insulating coupling rod is provided for transmitting the spring force to the pole drive unit.
  • Figure 1 shows a load break switch in a side view.
  • FIG. 2 shows the switch disconnector according to FIG. 1 in a three-pole design in a front view.
  • the switch disconnector 1 shown in Figure 1 has a support base 2, which may consist of sheet steel in a known manner. A total of four support insulators 3, 6, 11 and 17 are attached to the support base 2 for each pole.
  • the uppermost post insulator 3 serves as a carrier of a fixed isolating contact 4 and an upper connection device 5.
  • the following post insulator 6 is attached to a switch shaft 7, which is mounted in the support base 2.
  • the support insulator 6 carries a movable isolating contact piece 10, which is shown in the open position in FIG. 1.
  • the support insulator 6 with the movable isolating contact piece 10 can be pivoted clockwise, as a result of which the isolating contact piece 10 engages with the stationary isolating contact piece 4.
  • Another support insulator 11 is fixedly mounted on the support base 2 adjacent to the support insulator 6.
  • This carries a clamping device 12 on which a flexible, loop-shaped current band 13 for connection to the movable isolating contact piece 10 is attached.
  • a fixed connecting pin 14 of a vacuum interrupter 15 is attached to the clamping device 12.
  • the opposite end of the vacuum interrupter 15 rests in a pole drive unit 16 which is attached to a further post insulator 17.
  • a lower connection device 18 is also located on the pole drive unit 16.
  • a tension shaft 20 is rotatably mounted in the support base 2 of the switch disconnector 1 and has a crank arm 21. Another, similar crank arm 22 is located on the switch shaft 7.
  • the crank arms are coupled to one another by a rod 23 in such a way that the tension shaft 20 is carried along in the same sense when the switch shaft 7 rotates.
  • At least one suitable storage spring 24, which is shown in FIG. 1 as a helical spring, is connected to the tensioning shaft 20. Bending springs which surround the tensioning shaft 20 are also suitable. As can be seen, the storage spring 24 is thus tensioned when the switch shaft 7 is turned in the sense of switching on.
  • This is part of a drive device of the vacuum interrupter 15, designated as a whole by 25, to which the pole drive unit 16 belongs.
  • Another component of the drive device 25 is an insulating coupling rod 26, which transmits the force of the storage spring 24 to the pole drive unit 16.
  • the load break switch 1 is shown in the switched-off state.
  • the movable isolating contact piece 10 is brought into engagement with the stationary isolating contact piece 4 by rotating the switch shaft 7.
  • the storage spring 24 is tensioned by means of the rod 23.
  • the vacuum interrupter 15 serving as the load switching device is now released a latching of a conventional type, not shown separately, whereby the force of the storage spring 24 is transmitted to the pole drive unit 16 by means of the coupling rod 26 and the switching elements of the vacuum interrupter 15 are closed. There is thus a continuous electrical connection between the upper connection device 5 on the post insulator 3 and the lower connection device 18 on the pole drive unit 16.
  • the switch-disconnector 1 is switched off in the reverse order of the operations described.
  • the vacuum interrupter 15 is actuated by loosening a suitable switch-off latching device by means of the pole drive unit 16 in order to separate its switching pieces from one another. This can also be achieved by equipping the tensioning shaft 20 or the switch shaft 7 with a freewheel which, before it moves the tensioning shaft back, releases the release latch of the vacuum interrupter 15.
  • the circuit into which the load break switch 1 is switched on is hereby interrupted. Subsequently, by turning the switch shaft 7 and pivoting the support insulator 6, its starting position (FIG. 1) a visible separation distance can be created.
  • FIG. 2 three of the pole units explained with reference to FIG. 1 are arranged next to one another on the support base 2.
  • the switch shaft 7 and the tensioning shaft 20 expediently extend over the entire width of the support base 2 and can be supported with their ends in the end cheeks 27 of the support base 2.
  • the load switching device consisting of the vacuum switching tube 15 and the drive device 25 forms one Independently functional module that works similar to a circuit breaker due to its storage drive.
  • the coupling with the switch shaft 7 ensures, however, that the drive energy for the vacuum interrupter 15 is only available when the isolating contact pieces 4 and 10 are closed. It is also achieved by the coupling rod 23 that the storage spring 24 is relaxed again, and thus the vacuum interrupter 15 can not be switched on if the already closed isolating contact pieces 4 and 10 are opened again for any reason.
  • the drive device 25 as a storage drive, there is also a favorable possibility for triggering by the firing pin of a fuse lying in series with the load-break switch 1. Fuses for the present purpose are generally known as HV fuses, so that a more detailed description can be dispensed with.
  • the use of the drive device 25 also makes it possible, in contrast to switch disconnectors of another type, which have a load switch device in the form of an extinguishing tube or a flat arcing chamber, to actuate the isolating contact piece 10 at a moderate speed. A simple rotation of the switch shaft 7 by hand is therefore sufficient.
  • This property of the new switch-disconnector is also advantageous when remote control is provided, since the low demands on the switching speed also affect the effort for a remote-controlled drive device, e.g. B. a motor drive, have an advantageous effect.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Description

Die Erfindung betrifft einen Lasttrennschalter für Mittel spannung mit einem ortsfesten Trennkontaktstück und einem schwenkbar angeordneten bewegbaren Trennkontaktstück sowie mit je einem Stützisolator für das ortsfeste und für das bewegbare Trennkontaktstück, ferner mit einer elektrisch in Reihe mit den Trennkontaktstücken liegenden, als Lastschalteinrichtung dienenden Vakuumschaltröhre, die beim Einschalten des Lasttrennschalters nach dem Schließen der Trennkontaktstücke geschlossen und beim Ausschalten vor dem Öffnen der Trennkontaktstücke geöffnet wird, und mit einem Tragsockel für die Stützisolatoren und die Vakuumschaltröhre.The invention relates to a load-break switch for medium voltage with a fixed isolating contact piece and a pivotably arranged movable isolating contact piece and with a supporting insulator for the stationary and for the movable isolating contact piece, furthermore with an electrically in series with the isolating contact pieces, serving as a load switching device, the vacuum interrupter which Switching on the switch disconnector after closing the isolating contact pieces is closed and opened when switching off before opening the isolating contact pieces, and with a support base for the support insulators and the vacuum interrupter.

Ein Lasttrennschalter der genannten Art ist durch die DE-C-29 34 776 bekannt geworden. Die Betätigung der als Lastschalteinrichtung dienenden Vakuumschaltröhre erfolgt dabei zwangsläufig mittels eines Führungsschlitzes und einer Keilschräge. Diese Arbeitsweise erfordert es, daß die Antriebsvorrichtung für das bewegbare Trennkontaktstück nicht nur die Antriebsenergie für das Schließen und Öffnen der Trennstrecke, sondern auch die Antriebsenergie für die Vakuumschaltröhre aufzubringen hat. Mit Rücksicht auf die unterschiedlichen Anforderungen der Einheiten für den Trennvorgang und den Lastschaltvorgang ist es jedoch schwierig, eine solche gemeinsame Antriebsvorrichtung mit geeigneten Eigenschaften bereitzustellen. Auch ist die bekannte Bauart eines Lasttrennschalters in den Fällen nicht anwendbar, in denen die Ausladung des Trennmessers im ausgeschalteten Zustand aus Gründen des Raumbedarfes unerwünscht ist.A switch disconnector of the type mentioned is known from DE-C-29 34 776. The actuation of the vacuum interrupter serving as a load switching device inevitably takes place by means of a guide slot and a wedge bevel. This method of operation requires that the drive device for the movable isolating contact piece not only has to apply the drive energy for closing and opening the isolating path, but also the drive energy for the vacuum interrupter. In view of the different requirements of the units for the disconnection process and the power shift process, however, it is difficult to provide such a common drive device with suitable properties. Also, the known type of switch disconnector is not applicable in cases where the discharge of the disconnecting knife in switched off state is undesirable due to space requirements.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, einen Lasttrennschalter mit verhältnismäßig kleinem Einbauraum zu schaffen, der unter Verwendung erprobter Baugruppen hergestellt werden kann und der durch Trennung von Trennund Lastschaltfunktion eine hohe mechanische Lebensdauer erreicht.Proceeding from this, the object of the invention is to create a switch disconnector with a relatively small installation space, which can be manufactured using tried-and-tested modules and which achieves a long mechanical service life by separating the disconnection and load switching functions.

Gemäß der Erfindung wird diese Aufgabe bei einem Lasttrennschalter der eingangs gennanten Art dadurch gelöst, daß die Vakuumschaltröhre eine eigene Antriebsvorrichtung mit einer Speicherfeder besitzt und daß eine zur Betätigung des bewegbaren Trennkontaktstückes vorgesehene Schaltwelle mit einer Spannwelle der Antriebsvorrichtung der Vakuumschaltröhre derart gekuppelt ist, daß die Speicherfeder der Antriebsvorrichtung der Vakuumschaltröhre durch die Einschaltbewegung des bewegbaren Trennkontaktstückes gespannt und durch die Ausschaltbewegung entspannt wird und daß die Antriebsvorrichtung der Vakuumschaltröhre willkürlich freigebbar ist.According to the invention, this object is achieved in a switch disconnector of the type mentioned in that the vacuum interrupter has its own drive device with a storage spring and that a switching shaft provided for actuating the movable isolating contact piece is coupled to a tension shaft of the drive device of the vacuum interrupter in such a way that the storage spring the drive device of the vacuum interrupter is tensioned by the switch-on movement of the movable isolating contact piece and relaxed by the switch-off movement and that the drive device of the vacuum interrupter can be released arbitrarily.

Durch die Verwendung einer gesonderten Antriebsvorrichtung für die Vakuumschaltröhre wird erreicht, daß das bewegbare Trennkontaktstück nicht in die Kraftübertragung zur Vakuumschaltröhre eingeschaltet zu werden braucht. Dadurch sind ähnliche Antriebsvorrichtungen einsetzbar, wie sie für Leistungsschalter bekannt sind. Das bewegbare Trennkontaktstück benötigt demgegenüber nur einen einfachen Handantrieb, weil die Trennstrecke aufgrund der Reihenschaltung mit der Vakuumschaltröhre stets spannungslos geschaltet wird. Ferner entfällt das Erfordernis, eine Trennstrecke mit schwenkbarem Trennmesser zu verwenden. Vielmehr sind auch die bewährten Schwenkstützer-Trennschalter einsetzbar, die sich durch gleichbleibenden Raumbedarf im eingeschalteten und ausgeschalteten Zustand auszeichnen. Eine fehlerhafte Schaltfolge der Trennkontakte und der Vakuumschaltröhre ist dadurch ausgeschlossen, daß die Speicherfeder der Antriebsvorrichtung der Vakuumschaltröhre durch die Einschaltbewegung des bewegbaren Trennkontaktstückes gespannt wird. Wird nämlich die Trennstrecke nach dem Schließen wieder geöffnet, so wird auch die Speicherfeder für die Vakuumschaltröhre entspannt, so daß die Vakuumschaltröhre nicht bei offener Trennstrecke geschlossen werden kann.The use of a separate drive device for the vacuum interrupter means that the movable isolating contact piece does not have to be switched on in the power transmission to the vacuum interrupter. As a result, similar drive devices can be used as are known for circuit breakers. The movable isolating contact piece, on the other hand, only requires a simple manual drive because the isolating section is always disconnected from the power supply due to the series connection with the vacuum interrupter. Furthermore, there is no need to use a separating section with a pivoting separating knife. Rather, the proven swivel support disconnector can also be used, which are characterized by constant space requirements when switched on and off. A faulty switching sequence of the isolating contacts and the vacuum interrupter is precluded by the fact that the storage spring of the drive device of the vacuum interrupter is tensioned by the switch-on movement of the movable isolating contact piece. If the isolating section is opened again after closing, the storage spring for the vacuum interrupter is also released so that the interrupter cannot be closed when the isolating section is open.

Wie bereits erwähnt, können im Rahmen der Erfindung Trennschalter der Bauart mit Schwingstützer verwendet werden. Dies kann im Rahmen der Erfindung dadurch geschehen, daß an dem Tragsockel ein weiterer, mittels der Schalterwelle zu betätigender Stützisolator als Träger des bewegbaren Trennkontaktstückes und ein dritter und vierter Stützisolator als Träger der Vakuumschaltröhre, einer zugehörigen Polantriebseinheit und einer Anschlußvorrichtung des Lasttrennschalters angeordnet sind.As already mentioned, isolating switches of the type with vibration supports can be used within the scope of the invention. This can be done in the context of the invention in that a further support insulator to be actuated by means of the switch shaft as the carrier of the movable isolating contact piece and a third and fourth support insulator as a carrier of the vacuum interrupter, an associated pole drive unit and a connecting device of the switch disconnector are arranged on the support base.

Die erwähnte Spannung und Entspannung der Speicherfeder der Antriebsvorrichtung der Vakuumschaltröhre durch die Einschaltbewegung des bewegbaren Trennkontaktstückes kann auf einfache Weise dadurch erzielt werden, daß in dem Tragsockel in paralleler Stellung zu der Schalterwelle für die Antriebsvorrichtung der Vakuumschaltröhre eine Spannwelle drehbar gelagert ist, daß an der Schalterwelle und an der Spannwelle je ein Kurbelarm angebracht ist und daß die Kurbelarme miteinander gekuppelt sind.The aforementioned tension and relaxation of the storage spring of the drive device of the vacuum interrupter by the switch-on movement of the movable isolating contact piece can be achieved in a simple manner in that a tensioning shaft is rotatably mounted in the support base in parallel position to the switch shaft for the drive device of the vacuum interrupter, that on the switch shaft and a crank arm is attached to the tension shaft and that the crank arms are coupled to one another.

Zur Verringerung der Abmessungen des Lasttrennschalters kann noch dadurch beigetragen werden, daß die Speicherfeder der Antriebsvorrichtung der Vakuumschaltröhre in dem Tragsockel angeordnet und zur Übertragung der Federkraft zu der Polantriebseinheit eine isolierende Koppelstange vorgesehen ist.To reduce the dimensions of the switch disconnector can also be contributed that the storage spring the drive device of the vacuum interrupter is arranged in the support base and an insulating coupling rod is provided for transmitting the spring force to the pole drive unit.

Die Erfindung wird im folgenden anhand des in den Figuren dargestellten Ausführungsbeispieles näher erläutert.The invention is explained below with reference to the embodiment shown in the figures.

Die Figur 1 zeigt einen Lasttrennschalter in einer Seitenansicht.Figure 1 shows a load break switch in a side view.

In der Figur 2 ist der Lasttrennschalter gemäß der Figur 1 in dreipoliger Ausführung in der Vorderansicht dargestellt.FIG. 2 shows the switch disconnector according to FIG. 1 in a three-pole design in a front view.

Der in der Figur 1 gezeigte Lasttrennschalter 1 besitzt einen Tragsockel 2, der in bekannter Weise aus Stahlblech bestehen kann. Auf dem Tragsockel 2 sind insgesamt für jeden Pol vier Stützisolatoren 3, 6, 11 und 17 angebracht. Der oberste Stützisolator 3 dient als Träger eines feststehenden Trennkontaktes 4 und einer oberen Anschlußvorrichtung 5. Der folgende Stützisolator 6 ist auf einer Schalterwelle 7 angebracht, die in dem Tragsockel 2 gelagert ist. An seinem freien Ende trägt der Stützsolator 6 ein bewegbares Trennkontaktstück 10, daß in der Figur 1 in der geöffneten Stellung gezeigt ist. Durch Drehen der Schalterwelle 7 läßt sich der Stützisolator 6 mit dem bewegbaren Trennkontaktstück 10 im Uhrzeigersinn schwenken, wodurch das Trennkonaktstück 10 mit dem ortsfesten Trennkontaktstück 4 in Eingriff gelangt.The switch disconnector 1 shown in Figure 1 has a support base 2, which may consist of sheet steel in a known manner. A total of four support insulators 3, 6, 11 and 17 are attached to the support base 2 for each pole. The uppermost post insulator 3 serves as a carrier of a fixed isolating contact 4 and an upper connection device 5. The following post insulator 6 is attached to a switch shaft 7, which is mounted in the support base 2. At its free end, the support insulator 6 carries a movable isolating contact piece 10, which is shown in the open position in FIG. 1. By rotating the switch shaft 7, the support insulator 6 with the movable isolating contact piece 10 can be pivoted clockwise, as a result of which the isolating contact piece 10 engages with the stationary isolating contact piece 4.

An dem Tragsockel 2 ist dem Stützisolator 6 benachbart ein weiterer Stützisolator 11 fest montiert. Dieser trägt eine Klemmvorrichtung 12, an der ein biegsames schleifenfömiges Stromband 13 zur Verbindung mit dem bewegbaren Trennkontaktstück 10 befestigt ist. Ferner ist an der Klemmvorrichtung 12 ein feststehender Anschlußbolzen 14 einer Vakuumschaltröhre 15 befestigt. Das gegenüberliegende Ende der Vakuumschaltröhre 15 ruht in einer Polantriebseinheit 16, die an einem weiteren Stützisolator 17 angebracht ist. An der Polantriebseinheit 16 befindet sich auch eine untere Anschlußvorrichtung 18.Another support insulator 11 is fixedly mounted on the support base 2 adjacent to the support insulator 6. This carries a clamping device 12 on which a flexible, loop-shaped current band 13 for connection to the movable isolating contact piece 10 is attached. Furthermore, a fixed connecting pin 14 of a vacuum interrupter 15 is attached to the clamping device 12. The opposite end of the vacuum interrupter 15 rests in a pole drive unit 16 which is attached to a further post insulator 17. A lower connection device 18 is also located on the pole drive unit 16.

In paralleler Stellung zur der Schalterwelle 7 ist in dem Tragsockel 2 des Lasttrennschalters 1 eine Spannwelle 20 drehbar gelagert, die einen Kurbelarm 21 besitzt. Ein weiterer, ähnlicher Kurbelarm 22 befindet sich an der Schalterwelle 7. Die Kurbelarme sind miteinander durch eine Stange 23 derart gekuppelt, daß bei einer Drehung der Schalterwelle 7 die Spannwelle 20 im gleichen Sinne mitgenommen wird. Mit der Spannwelle 20 ist wenigstens eine geeignete Speicherfeder 24 verbunden, die in der Figur 1 als Schraubenfeder dargestellt ist. Gleichfalls geeignet sind Biegefedern, welche die Spannwelle 20 umgeben. Wie man erkennt, wird somit beim Drehen der Schalterwelle 7 im Sinne des Einschaltens die Speicherfeder 24 gespannt. Diese ist Bestandteil einer als Ganzes mit 25 bezeichneten Antriebsvorrichtung der Vakuumschaltröhre 15, zu der die Polantriebseinheit 16 gehört. Weiterer Bestandteil der Antriebsvorrichtung 25 ist eine isolierende Koppelstange 26, welche die Kraft der Speicherfeder 24 auf die Polantriebseinheit 16 überträgt.In a parallel position to the switch shaft 7, a tension shaft 20 is rotatably mounted in the support base 2 of the switch disconnector 1 and has a crank arm 21. Another, similar crank arm 22 is located on the switch shaft 7. The crank arms are coupled to one another by a rod 23 in such a way that the tension shaft 20 is carried along in the same sense when the switch shaft 7 rotates. At least one suitable storage spring 24, which is shown in FIG. 1 as a helical spring, is connected to the tensioning shaft 20. Bending springs which surround the tensioning shaft 20 are also suitable. As can be seen, the storage spring 24 is thus tensioned when the switch shaft 7 is turned in the sense of switching on. This is part of a drive device of the vacuum interrupter 15, designated as a whole by 25, to which the pole drive unit 16 belongs. Another component of the drive device 25 is an insulating coupling rod 26, which transmits the force of the storage spring 24 to the pole drive unit 16.

In der Figur 1 ist der Lasttrennschalter 1 im ausgeschalteten Zustand gezeigt. Zum Einschalten wird, wie bereits erwähnt, durch Drehen der Schalterwelle 7 das bewegbare Trennkonaktstück 10 in Eingriff mit dem ortsfesten Trennkontaktstück 4 gebracht. Bei diesem Vorgang wird mittels der Stange 23 die Speicherfeder 24 gespannt. Zum Einschalten der als Lastschaltvorichtung dienenden Vakuumschaltröhre 15 wird nun eine nicht gesondert dargestellte Verklinkung üblicher Bauart freigegeben, wodurch die Kraft der Speicherfeder 24 mittels der Koppelstange 26 auf die Polantriebseinheit 16 übertragen und die Schaltstücke der Vakuumschaltröhre 15 geschlossen werden. Damit besteht eine durchgehende elektrische Verbindung zwischen der oberen Anschlußvorrichtung 5 am Stützisolator 3 und der unteren Anschlußvorrichtung 18 an der Polantriebseinheit 16.In Figure 1, the load break switch 1 is shown in the switched-off state. For switching on, as already mentioned, the movable isolating contact piece 10 is brought into engagement with the stationary isolating contact piece 4 by rotating the switch shaft 7. In this process, the storage spring 24 is tensioned by means of the rod 23. To switch on The vacuum interrupter 15 serving as the load switching device is now released a latching of a conventional type, not shown separately, whereby the force of the storage spring 24 is transmitted to the pole drive unit 16 by means of the coupling rod 26 and the switching elements of the vacuum interrupter 15 are closed. There is thus a continuous electrical connection between the upper connection device 5 on the post insulator 3 and the lower connection device 18 on the pole drive unit 16.

Das Ausschalten des Lasttrennschalters 1 erfolgt in umgekehrter Reihenfolge der beschriebenen Vorgänge. Zunächst wird durch Lösung einer geeigneten Ausschaltverklinkung mittels der Polantriebseinheit 16 die Vakuumschaltröhre 15 betätigt, um deren Schaltstücke voneinander zu trennen. Dies kann man auch dadurch erreichen, indem man die Spannwelle 20 oder die Schalterwelle 7 mit einem Freilauf ausrüstet, der, bevor er die Spannwelle zurückbewegt, die Ausschaltverklinkung der Vakuumschaltröhre 15 löst. Hiermit wird der Stromkreis, in den der Lasttrennschalter 1 eingeschaltet ist, unterbrochen. Anschließend kann durch Drehung der Schalterwelle 7 und Schwenkung des Stützisolators 6 seine Ausgangslage (Figur 1) eine sichtbare Trennstrecke geschaffen werden.The switch-disconnector 1 is switched off in the reverse order of the operations described. First, the vacuum interrupter 15 is actuated by loosening a suitable switch-off latching device by means of the pole drive unit 16 in order to separate its switching pieces from one another. This can also be achieved by equipping the tensioning shaft 20 or the switch shaft 7 with a freewheel which, before it moves the tensioning shaft back, releases the release latch of the vacuum interrupter 15. The circuit into which the load break switch 1 is switched on is hereby interrupted. Subsequently, by turning the switch shaft 7 and pivoting the support insulator 6, its starting position (FIG. 1) a visible separation distance can be created.

Wie der Figur 2 zu entnehmen ist, sind auf dem Tragsockel 2 nebeneinander drei der anhand der Figur 1 erläuterten Poleinheiten angeordnet. Die Schalterwelle 7 und die Spannwelle 20 erstrecken sich dabei zweckmäßig über die gesamte Breite des Tragsockel 2 und können mit ihren Enden in der Endwangen 27 des Tragsockels 2 gelagert sein.As can be seen from FIG. 2, three of the pole units explained with reference to FIG. 1 are arranged next to one another on the support base 2. The switch shaft 7 and the tensioning shaft 20 expediently extend over the entire width of the support base 2 and can be supported with their ends in the end cheeks 27 of the support base 2.

Die aus der Vakuumschaltröhre 15 und der Antriebsvorrichtung 25 bestehende Lastschaltvorrichtung bildet eine selbständig funktionsfähige Baugruppe, die durch ihren Speicherantrieb ähnlich wie ein Leistungsschalter arbeitet. Durch die Kupplung mit der Schalterwelle 7 ist jedoch dafür gesorgt, daß die Antriebsenergie für die Vakuumschaltröhre 15 erst dann zur Verfügung steht, wenn die Trennkontaktstücke 4 und 10 geschlossen sind. Ferner wird durch die Kuppelstange 23 erreicht, daß die Speicherfeder 24 wieder entspannt wird, und damit die Vakuumschaltröhre 15 nicht eingeschaltet werden kann, wenn aus beliebigen Grund die bereits geschlossenen Trennkontaktstücke 4 und 10 wieder geöffnet werden. Durch die Ausbildung der Antriebsvorrichtung 25 als Speicherantrieb besteht auch eine günstige Möglichkeit für eine Auslösung durch den Schlagbolzen einer in Reihe mit dem Lasttrennschalter 1 liegenden Sicherung. Sicherungen für den vorliegenden Zeck sind als HH-Sicherungen allgemein bekannt, so daß von einer näheren Beschreibung abgesehen werden kann.The load switching device consisting of the vacuum switching tube 15 and the drive device 25 forms one Independently functional module that works similar to a circuit breaker due to its storage drive. The coupling with the switch shaft 7 ensures, however, that the drive energy for the vacuum interrupter 15 is only available when the isolating contact pieces 4 and 10 are closed. It is also achieved by the coupling rod 23 that the storage spring 24 is relaxed again, and thus the vacuum interrupter 15 can not be switched on if the already closed isolating contact pieces 4 and 10 are opened again for any reason. By designing the drive device 25 as a storage drive, there is also a favorable possibility for triggering by the firing pin of a fuse lying in series with the load-break switch 1. Fuses for the present purpose are generally known as HV fuses, so that a more detailed description can be dispensed with.

Die Verwendung der Antriebsvorrichtung 25 erlaubt es auch, im Unterschied zu Lasttrennschaltern anderer Bauart, die eine Lastschalteinrichtung in Gestalt eines Löschrohres oder einer Flachlöschkammer besitzen, das Trennkontaktstück 10 mit mäßiger Geschwindigkeit zu betätigen. Es genügt daher eine einfache Drehung der Schalterwelle 7 von Hand. Diese Eigenschaft des neuen Lasttrennschalters ist auch dann vorteilhaft, wenn eine Fernsteuerung vorgesehen ist, da sich die geringen Anforderungen an die Schaltgeschwindigkeit auch auf den Aufwand für eine fernsteuerbare Antriebsvorrichtung, z. B. einen Motorantrieb, vorteilhaft auswirken.The use of the drive device 25 also makes it possible, in contrast to switch disconnectors of another type, which have a load switch device in the form of an extinguishing tube or a flat arcing chamber, to actuate the isolating contact piece 10 at a moderate speed. A simple rotation of the switch shaft 7 by hand is therefore sufficient. This property of the new switch-disconnector is also advantageous when remote control is provided, since the low demands on the switching speed also affect the effort for a remote-controlled drive device, e.g. B. a motor drive, have an advantageous effect.

Claims (4)

  1. Load disconnector (2) for medium voltage having a fixed-position isolating contact piece (4) and a movable isolating contact piece (10), which is arranged such that it can pivot, and having in each case one supporting insulator (3, 6) for the fixed-position isolating contact piece (4) and for the movable isolating contact piece (10), furthermore having a vacuum switching tube (15) which is connected electrically in series with the isolating contact pieces (4, 10), is used as a load switching device, is closed after the isolating contact pieces (4, 10) have closed when the load disconnector (2) is being switched on and is opened before opening of the isolating contact pieces (4, 10) during switching off, and having a supporting base (2) for the supporting insulators (3, 6) and the vacuum switching tube (15), characterized in that the vacuum switching tube (15) has a dedicated drive device (25) with a storage spring (24), and in that a switch shaft (7), which is provided for operation of the movable isolating contact piece (10), is coupled to a winding shaft (20) of the drive device (25) of the vacuum switching tube (15) in such a manner that the storage spring (24) of the drive device (25) of the vacuum switching tube (15) is stressed by the switchingon movement of the movable isolating contact piece (10) and is relieved of stress by the switching-off movement, and in that the drive device (25) of the vacuum switching tube (15) can be released manually.
  2. Load disconnector according to Claim 1, characterized in that a further supporting insulator (2), which can be operated by means of the switch shaft (7), is arranged on the supporting base (2) as a support for the movable isolating contact piece (10), and a fourth supporting insulator (17) is arranged on the supporting base (2) as a support for the vacuum switching tube (15), an associated pole drive unit (16) and a connecting device (18) for the load disconnector (1).
  3. Load disconnector according to Claim 2, characterized in that a winding shaft (20) is mounted such that it can rotate in the supporting base (2) in a position parallel to the switch shaft (7) for the drive device (25) of the vacuum switching tube (15), in that in each case one crank arm (21, 22) is fitted to the winding shaft (20) and to the switch shaft (7), and in that the crank arms (21, 22) are coupled to one another by a rod (23).
  4. Load disconnector according to Claim 3, characterized in that the storage spring (24) of the drive device (25) of the vacuum switching tube (15) is arranged in the supporting base (2), and an insulating coupling rod (26) is provided for transmission of the spring force to the pole drive unit (16).
EP93250283A 1992-12-08 1993-10-20 Load break switch for medium voltage with a vacuum switch tube Expired - Lifetime EP0601672B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4242379 1992-12-08
DE4242379A DE4242379A1 (en) 1992-12-08 1992-12-08 Switch-disconnector for medium voltage with a vacuum interrupter

Publications (2)

Publication Number Publication Date
EP0601672A1 EP0601672A1 (en) 1994-06-15
EP0601672B1 true EP0601672B1 (en) 1996-07-03

Family

ID=6475372

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93250283A Expired - Lifetime EP0601672B1 (en) 1992-12-08 1993-10-20 Load break switch for medium voltage with a vacuum switch tube

Country Status (3)

Country Link
EP (1) EP0601672B1 (en)
DE (2) DE4242379A1 (en)
ES (1) ES2089706T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19904178A1 (en) * 1999-02-03 2000-08-10 Alstom Sachsenwerk Gmbh Switching device in switching system has additional switching path for switching a switching system on and/or off that is connected in parallel with first switching path

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1244913B (en) * 1964-04-14 1967-07-20 Licentia Gmbh Vacuum switch
US4105878A (en) * 1977-01-17 1978-08-08 Mcgraw-Edison Company Vacuum interrupter and disconnect combination
DE2934776C2 (en) * 1979-08-28 1982-05-06 Siemens AG, 1000 Berlin und 8000 München Medium voltage switch disconnectors.
GB2129617B (en) * 1982-09-22 1986-07-23 Scott L & Electromotors Ltd Electrical isolating switch

Also Published As

Publication number Publication date
ES2089706T3 (en) 1996-10-01
EP0601672A1 (en) 1994-06-15
DE4242379A1 (en) 1994-06-09
DE59303134D1 (en) 1996-08-08

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