EP1991998B1 - On-load tap changer with an energy storage mechanism - Google Patents

On-load tap changer with an energy storage mechanism Download PDF

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Publication number
EP1991998B1
EP1991998B1 EP06818371A EP06818371A EP1991998B1 EP 1991998 B1 EP1991998 B1 EP 1991998B1 EP 06818371 A EP06818371 A EP 06818371A EP 06818371 A EP06818371 A EP 06818371A EP 1991998 B1 EP1991998 B1 EP 1991998B1
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EP
European Patent Office
Prior art keywords
spring
tie rod
bearing
energy storage
load tap
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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.)
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EP06818371A
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German (de)
French (fr)
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EP1991998A1 (en
Inventor
Wolfgang Albrecht
Thomas M. Huber
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Maschinenfabrik Reinhausen GmbH
Scheubeck GmbH and Co
Original Assignee
Maschinenfabrik Reinhausen GmbH
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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Publication of EP1991998A1 publication Critical patent/EP1991998A1/en
Application granted granted Critical
Publication of EP1991998B1 publication Critical patent/EP1991998B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0027—Operating mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor

Definitions

  • the invention relates to an on-load tap-changer with a force storage device for uninterrupted switching between different winding taps of a tapped transformer under load.
  • On-load tap-changer VACUTAP® VV Operating Instructions Imprint BA164 / 03en.
  • This on-load tap-changer unites in it the function of both a selector for powerless preselection of the tap to be switched to, and a diverter switch for the actual switching.
  • the energy storage of this known on-load tap changer has a spring plate on which a plurality of tension springs are attached, each having one end, which are hinged at their respective other end to bearings.
  • the spring plate in turn is rotatably mounted at its free end to a drive crank.
  • the drive crank which is mounted on a shift shaft is actuated via a freewheel by a drive element which is mounted centrally on the control shaft and independently of this rotatably.
  • the selector shaft carries on its lower side a Maltese crank of a Geneva drive.
  • the wheel of the Geneva wheel of this Maltese transmission is connected to a rotatable switch column mounted centrally in the interior of an insulating tube and carrying the switching elements on a cantilever.
  • the fixed step contacts are provided in several horizontal levels, which can be selectively connected in each level of one of the switching elements on the switch column.
  • the mode of action of this known energy store is the following: At the beginning of a scheduled load switching, ie the changeover from one winding tap to an adjacent other winding tap, begins itself, usually operated by a motor drive, the drive element to rotate slowly and continuously. It takes by a stop the drive crank and thus also attached to her end of the spring plate, thereby the tension springs are deflected and tensioned. After initially 180 ° rotation angle, when the springs have reached their maximum deflection, the drive element is disengaged from the drive crank by the freewheel. After exceeding the dead center, the further rotation of the drive crank takes place abruptly, since the tension springs are still taut at this time. This rapid rotation of the drive crank is transmitted to the Maltese crank of the Geneva drive and thus to the switch column; the attached switching elements suddenly switch to adjacent fixed tap contacts. The load switching is completed.
  • the object of the invention is therefore to provide a generic on-load tap-changer, as in EP 0 355 814 disclosed, with a force accumulator having energy storage springs as energy storage to specify, which has a higher mechanical fatigue strength.
  • the energy storage device according to the invention can be used for a wide variety of on-load tap-changers; it can be used both with oil-switching devices with mechanical switching contacts as well as those with vacuum switching cells.
  • FIG. 1 be explained in more detail. It is shown a support plate 1, on which the entire energy accumulator and the gear arrangement for actuating the on-load tap-changer are arranged.
  • the support plate 1 has bracket 2. Furthermore, a gear 3 is shown, which is connected to the motor drive shaft, not shown.
  • the gear 3 drives a drive element 4 via its toothing 5.
  • the drive element 4 in turn has two symmetrical stops 6, 7, which correspond to a drive crank 8. This will be explained later in more detail.
  • On top of the drive crank 8, a pull rod head 9 of a pull rod 10 is rotatably mounted.
  • the pull rod 10 is connected to the other parts of the force accumulator according to the invention, which are explained in more detail below, in conjunction.
  • Attached is the drive crank 8 on one Switching shaft 11, which leads vertically through the support plate through down and at its lower end has a Maltese crank, not shown here.
  • This Maltese crank is in FIG. 2 shown and provided there with the reference numeral 12.
  • This Maltese crank 12 enters a Maltese wheel 13, which in turn is in communication with the switch column, not shown.
  • the spring tube 14 is hinged on one side to a bearing block 15; by means of a vertical bearing pin 16, it is horizontally pivotable. Between inner rod 10 and spring tube 14, an inner compression spring 17 is provided, outside of the spring tube 14 is concentric an outer compression spring 18. In the embodiment shown here, an arrangement with inner compression spring 17 and outer compression spring 18 was granted to produce high forces. However, it is also possible within the scope of the invention to provide only a single compression spring, optionally disposed inside or outside the spring tube 14. It is also possible to provide more than two such compression springs. At the in FIG.
  • 1 illustrated embodiment of the invention are based inner compression spring 17 and outer compression spring 18 on one side to a fixed spring abutment 19 which is connected to the spring tube 14, from.
  • the inner compression spring 17 is supported on a movable inner spring abutment 20, which is only in FIG. 2 is shown, and the outer compression spring 18 on a movable outer spring abutment 21 from.
  • Inner and outer spring abutment 20 and 21 are connected to the free end of the tie rod 10 in connection.
  • the inner spring abutment 20 is fastened directly to the pull rod 10.
  • longitudinal recesses 22 are provided for attachment of the outer spring abutment 21, which surrounds the spring tube 14, on the pull rod 10 in the spring tube 14 on both sides longitudinal recesses 22 are provided.
  • FIG. 1 The operation of the inventive arrangement, the FIG. 1 is shown is the following: At the beginning of each switching, ie each actuation of the diverter switch, a motor drive rotates the gear 3 via the motor drive shaft, not shown. This rotational movement is transmitted via the toothing 5 to the drive element 4. Depending on the direction of rotation, which depends on whether the next load switching should take place in the direction of "higher” or "lower", one of the two stops 6 or 7 of the drive element 4 is in positive engagement with the drive crank 8 and rotates with it. The attached to the drive crank 8 Switzerlandstangenkopf 9 is moved; the tie rod 10 is deflected and the compression springs 17, 18 are tensioned.
  • the tie rod 10 is screwed at one end by a thread 27 with the inner abutment 20.
  • this thread 27 particularly advantageously designed as a fine thread
  • an adjustable tie rod 10 in which the effective length between the fixed spring abutment 19 and the movable spring abutments 20, 21 can be changed in a simple manner.
  • the energy storage can in this Embodiment easily be adapted to the specific requirements of the energy of the released power storage springs, which may be different depending on switch type and switching sequence.

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  • Transmission Devices (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Housings And Mounting Of Transformers (AREA)

Description

Die Erfindung betrifft einen Laststufenschalter mit einem Kraftspeicher zur unterbrechungslosen Umschaltung zwischen verschiedenen Wicklungsanzapfungen eines Stufentransformators unter Last.The invention relates to an on-load tap-changer with a force storage device for uninterrupted switching between different winding taps of a tapped transformer under load.

Ein solcher Laststufenschalter mit einem zugehörigen Kraftspeicher ist aus der Druckschrift der Anmelderin "Laststufenschalter VACUTAP® VV-Betriebsanleitung", Impressum BA164/03de, bekannt. Dieser Laststufenschalter vereinigt dabei in sich die Funktion sowohl eines Wählers zur leistungslosen Vorwahl der Anzapfung, auf die umgeschaltet werden soll, sowie eines Lastumschalters zur eigentlichen Umschaltung.Such an on-load tap-changer with an associated energy store is known from the applicant's publication "On-load tap-changer VACUTAP® VV Operating Instructions", Imprint BA164 / 03en. This on-load tap-changer unites in it the function of both a selector for powerless preselection of the tap to be switched to, and a diverter switch for the actual switching.

Der Kraftspeicher dieses bekannten Laststufenschalters weist ein Federblech auf, an dem mehrere Zugfedern mit jeweils einem Ende befestigt sind, die an ihrem jeweils anderen Ende an Lagerstellen angelenkt sind. Das Federblech wiederum ist an seinem freien Ende an einer Antriebskurbel drehbar befestigt. Die Antriebskurbel, die auf einer Schaltwelle befestigt ist, wird über einen Freilauf von einem Antriebselement, das zentrisch an der Schaltwelle und unabhängig von dieser drehbar gelagert ist, betätigt. Die Schaltwelle trägt an ihrer unteren Seite eine Malteserkurbel eines Maltesergetriebes. Das Malteserrad dieses Maltesergetriebes schließlich ist mit einer zentrisch im Inneren eines Isolierstoffrohres gelagerten, drehbaren Schaltersäule verbunden, die die Schaltelemente an einem Ausleger trägt.The energy storage of this known on-load tap changer has a spring plate on which a plurality of tension springs are attached, each having one end, which are hinged at their respective other end to bearings. The spring plate in turn is rotatably mounted at its free end to a drive crank. The drive crank, which is mounted on a shift shaft is actuated via a freewheel by a drive element which is mounted centrally on the control shaft and independently of this rotatably. The selector shaft carries on its lower side a Maltese crank of a Geneva drive. Finally, the wheel of the Geneva wheel of this Maltese transmission is connected to a rotatable switch column mounted centrally in the interior of an insulating tube and carrying the switching elements on a cantilever.

In der Wandung des Isolierstoffrohres sind in mehreren horizontalen Ebenen die festen Stufenkontakte vorgesehen, die in jeder Ebene von einem der Schaltelemente an der Schaltersäule wahlweise beschaltbar sind.In the wall of the insulating tube, the fixed step contacts are provided in several horizontal levels, which can be selectively connected in each level of one of the switching elements on the switch column.

Die Wirkungsweise dieses bekannten Kraftspeichers ist folgende:
Zu Beginn einer vorgesehenen Lastumschaltung, d. h. der Umschaltung von einer Wicklungsanzapfung auf eine benachbarte andere Wicklungsanzapfung, beginnt sich, betätigt in der Regel durch einen Motorantrieb, das Antriebselement langsam und kontinuierlich zu drehen. Es nimmt durch einen Anschlug die Antriebskurbel und damit auch das an ihr befestigte Ende des Federbleches mit, dadurch werden die Zugfedern ausgelenkt und gespannt. Nach zunächst 180° Drehwinkel, wenn die Zugfedern ihre maximale Auslenkung erreicht haben, gerät durch den Freilauf das Antriebselement außer Eingriff mit der Antriebskurbel. Nach Überschreiten des Totpunktes vollzieht sich die weitere Drehung der Antriebskurbel sprungartig, da zu diesem Zeitpunkt die Zugfedern noch gespannt sind.
Diese schnelle Drehbewegung der Antriebskurbel wird auf die Malteserkurbel des Maltesergetriebes und damit auf die Schaltersäule übertragen; die daran befestigten Schaltelemente schalten sprungartig jeweils auf benachbarte feste Stufenkontakte um. Die Lastumschaltung ist beendet.The mode of action of this known energy store is the following:
At the beginning of a scheduled load switching, ie the changeover from one winding tap to an adjacent other winding tap, begins itself, usually operated by a motor drive, the drive element to rotate slowly and continuously. It takes by a stop the drive crank and thus also attached to her end of the spring plate, thereby the tension springs are deflected and tensioned. After initially 180 ° rotation angle, when the springs have reached their maximum deflection, the drive element is disengaged from the drive crank by the freewheel. After exceeding the dead center, the further rotation of the drive crank takes place abruptly, since the tension springs are still taut at this time.
This rapid rotation of the drive crank is transmitted to the Maltese crank of the Geneva drive and thus to the switch column; the attached switching elements suddenly switch to adjacent fixed tap contacts. The load switching is completed.

Dieser Kraftspeicher hat sich seit vielen Jahren bei den verschiedensten Stufenschaltern bewährt. Allerdings sind die verwendeten Zugfedern nicht unbegrenzt mechanisch dauerfest, sondern müssen nach einer bestimmten Betriebsdauer oder Schaltzahl aus Sicherheitsgründen ausgetauscht werden. Bisher war dies kein Problem, da nach einer solchen Schaltzahl in der Regel ohnehin Inspektionen am Laststufenschalter vorgenommen wurden. Durch die hohe Zuverlässigkeit der inzwischen verfügbaren und eingesetzten Vakuumschaltzellen und die Vorteile der Vakuumschalttechnik insgesamt können die Wartungsintervalle der Laststufenschalter jetzt jedoch erhöht werden, so dass sich die beschränkte mechanische Dauerfestigkeit der verwendeten Zugfedern bei den bekannten Kraftspeichern zunehmend als Nachteil erweist.This energy storage has proven itself for many years in a variety of tap changers. However, the tension springs used are not indefinite mechanical fatigue, but must be replaced after a certain period of operation or number of switches for safety reasons. So far, this was not a problem, since after such a number of operations usually inspections were made on the on-load tap-changer. Due to the high reliability of the now available and used vacuum switching cells and the advantages of vacuum switching technology overall, the maintenance intervals of the on-load tap-changer can now be increased, so that the limited mechanical fatigue strength of the tension springs used in the known energy stores increasingly proves to be a disadvantage.

Aufgabe der Erfindung ist es demnach, einen gattungsgemäßen Laststufenschalter, wie in EP 0 355 814 offenbart, mit einem Kraftspeicher, der Kraftspeicherfedern als Energiespeicher aufweist, anzugeben, der eine höhere mechanische Dauerfestigkeit aufweist.The object of the invention is therefore to provide a generic on-load tap-changer, as in EP 0 355 814 disclosed, with a force accumulator having energy storage springs as energy storage to specify, which has a higher mechanical fatigue strength.

Diese Aufgabe wird durch einen Laststufenschalter mit Kraftspeicher mit den Merkmalen des ersten Patentanspruches gelöst. Die Unteransprüche betreffen besonders vorteilhafte Weiterbildungen der Erfindung.This object is achieved by an on-load tap changer with energy accumulator having the features of the first claim. The subclaims relate to particularly advantageous developments of the invention.

Der Vorteil der Erfindung besteht neben der angestrebten nahezu unbegrenzten mechanischen Festigkeit der verwendeten Druckfedern, deren Bruch praktisch ausgeschlossen ist, nach einer besonders vorteilhaften Ausführungsform der Erfindung auch darin, dass durch die Verwendung einer verstellbaren Zugstange mit einem Gewinde die Höhe der Kraft des Kraftspeichers kontinuierlich eingestellt werden kann. Damit ist es auf einfache Weise möglich, den Kraftspeicher vorab auf die unterschiedlichsten Lastschaltertypen einzustellen und hinsichtlich der frei gesetzten Kraft nach der Auslösung anzupassen. Der erfindungsgemäße Kraftspeicher ist für die unterschiedlichsten Laststufenschalter verwendbar; er kann sowohl bei unter Öl schaltenden Geräten mit mechanischen Schaltkontakten als auch bei solchen mit Vakuumschaltzellen eingesetzt werden.The advantage of the invention in addition to the desired almost unlimited mechanical strength of the compression springs used, the breakage is practically excluded, according to a particularly advantageous embodiment of the invention also in that adjusted by the use of an adjustable drawbar with a thread, the amount of force of the energy storage device continuously can be. This makes it possible in a simple manner to set the energy storage in advance on a variety of load switch types and to adjust the release of force according to the released. The energy storage device according to the invention can be used for a wide variety of on-load tap-changers; it can be used both with oil-switching devices with mechanical switching contacts as well as those with vacuum switching cells.

Die Erfindung soll nachfolgend an Hand von Zeichnungen beispielhaft noch näher erläutert werden. Es zeigen:

  • Figur 1 den oberen Teil eines erfindungsgemäßen Laststufenschalters mit Kraftspeicher in perspektivischer Darstellung
  • Figur 2 eine schematische seitliche Schnittdarstellung eines solchen Laststufenschalters mit Kraftspeicher.
The invention will be explained in more detail by way of example with reference to drawings. Show it:
  • FIG. 1 the upper part of an on-load tap changer according to the invention with energy storage in perspective view
  • FIG. 2 a schematic sectional side view of such an on-load tap changer with energy storage.

Zunächst soll die Figur 1 näher erläutert werden. Es ist eine Tragplatte 1 gezeigt, auf der der gesamte Kraftspeicher und die Getriebeanordnung zur Betätigung des Laststufenschalters angeordnet sind. Die Tragplatte 1 weist Haltewinkel 2 auf. Weiterhin ist ein Zahnrad 3 gezeigt, das mit der nicht dargestellten Motorantriebswelle verbunden ist. Das Zahnrad 3 treibt ein Antriebselement 4 über dessen Verzahnung 5 an. Das Antriebselement 4 wiederum besitzt zwei symmetrische Anschläge 6, 7, die mit einer Antriebskurbel 8 korrespondieren. Dies wird später noch näher erläutert werden. Oben auf der Antriebskurbel 8 ist ein Zugstangenkopf 9 einer Zugstange 10 drehbar gelagert. Die Zugstange 10 steht mit den weiteren Teilen des erfindungsgemäßen Kraftspeichers, die weiter unten noch näher erläutert werden, in Verbindung. Befestigt ist die Antriebskurbel 8 auf einer Schaltwelle 11, die senkrecht durch die Tragplatte hindurch nach unten führt und an ihrem unteren Ende eine hier nicht dargestellte Malteserkurbel aufweist. Diese Malteserkurbel ist in Figur 2 gezeigt und dort mit dem Bezugszeichen 12 versehen. Diese Malteserkurbel 12 läuft in ein Malteserrad 13 ein, das wiederum mit der nicht dargestellten Schaltersäule in Verbindung steht.First, the FIG. 1 be explained in more detail. It is shown a support plate 1, on which the entire energy accumulator and the gear arrangement for actuating the on-load tap-changer are arranged. The support plate 1 has bracket 2. Furthermore, a gear 3 is shown, which is connected to the motor drive shaft, not shown. The gear 3 drives a drive element 4 via its toothing 5. The drive element 4 in turn has two symmetrical stops 6, 7, which correspond to a drive crank 8. This will be explained later in more detail. On top of the drive crank 8, a pull rod head 9 of a pull rod 10 is rotatably mounted. The pull rod 10 is connected to the other parts of the force accumulator according to the invention, which are explained in more detail below, in conjunction. Attached is the drive crank 8 on one Switching shaft 11, which leads vertically through the support plate through down and at its lower end has a Maltese crank, not shown here. This Maltese crank is in FIG. 2 shown and provided there with the reference numeral 12. This Maltese crank 12 enters a Maltese wheel 13, which in turn is in communication with the switch column, not shown.

Um die bereits erläuterte Zugstange 10 herum ist erfindungsgemäß ein Federrohr 14 vorgesehen. Das Federrohr 14 ist an einer Seite an einem Lagerbock 15 angelenkt; mittels eines senkrechten Lagerbolzens 16 ist es horizontal verschwenkbar. Zwischen Zugstange 10 und Federrohr 14 ist eine innere Druckfeder 17 vorgesehen, außerhalb des Federrohres 14 befindet sich konzentrisch eine äußere Druckfeder 18. Im hier gezeigten Ausführungsbeispiel wurde eine Anordnung mit innerer Druckfeder 17 und äußerer Druckfeder 18 gewährt, um hohe Kräfte zu erzeugen. Es ist im Rahmen der Erfindung jedoch auch möglich, nur eine einzige Druckfeder, wahlweise innerhalb oder außerhalb des Federrohres 14 angeordnet, vorzusehen. Es können auch mehr als zwei solche Druckfedern vorgesehen werden. Bei der in Figur 1 dargestellten Ausführungsform der Erfindung stützen sich innere Druckfeder 17 und äußere Druckfeder 18 an einer Seite an einem festen Federwiderlager 19, das mit dem Federrohr 14 verbunden ist, ab. An der anderen Seite stützt sich die innere Druckfeder 17 an einem beweglichen inneren Federwiderlager 20, das nur in Figur 2 dargestellt ist, und die äußere Druckfeder 18 an einem beweglichen äußeren Federwiderlager 21 ab. Inneres und äußeres Federwiderlager 20 und 21 stehen mit dem freien Ende der Zugstange 10 in Verbindung. Das innere Federwiderlager 20 ist dabei direkt an der Zugstange 10 befestigt. Zur Befestigung des äußeren Federwiderlagers 21, das das Federrohr 14 umschließt, an der Zugstange 10 sind im Federrohr 14 beidseitige Längsaussparungen 22 vorgesehen. Durch diese Längsaussparungen 22 ragt ein Befestigungsbolzen 23 nach außen, der Zugstange 10 und äußeres Federwiderlager 21 miteinander verbindet. In der Figur 1 ist noch eine Rolle 24 gezeigt, die mit einem weiteren Malteserrad 25 zusammenwirkt, das auf bekannte Weise eine Stellungsanzeige 26 sowie auf ebenfalls bekannte Weise einen Vorwähler betätigt.Around the already described tie rod 10 around a spring tube 14 is provided according to the invention. The spring tube 14 is hinged on one side to a bearing block 15; by means of a vertical bearing pin 16, it is horizontally pivotable. Between inner rod 10 and spring tube 14, an inner compression spring 17 is provided, outside of the spring tube 14 is concentric an outer compression spring 18. In the embodiment shown here, an arrangement with inner compression spring 17 and outer compression spring 18 was granted to produce high forces. However, it is also possible within the scope of the invention to provide only a single compression spring, optionally disposed inside or outside the spring tube 14. It is also possible to provide more than two such compression springs. At the in FIG. 1 illustrated embodiment of the invention are based inner compression spring 17 and outer compression spring 18 on one side to a fixed spring abutment 19 which is connected to the spring tube 14, from. On the other side, the inner compression spring 17 is supported on a movable inner spring abutment 20, which is only in FIG. 2 is shown, and the outer compression spring 18 on a movable outer spring abutment 21 from. Inner and outer spring abutment 20 and 21 are connected to the free end of the tie rod 10 in connection. The inner spring abutment 20 is fastened directly to the pull rod 10. For attachment of the outer spring abutment 21, which surrounds the spring tube 14, on the pull rod 10 in the spring tube 14 on both sides longitudinal recesses 22 are provided. Through these longitudinal recesses 22 protrudes a fastening bolt 23 to the outside, the pull rod 10 and outer spring abutment 21 connects to each other. In the FIG. 1 is still a roller 24 shown, which cooperates with another Maltese 25, which operates in a known manner, a position indicator 26 and also known manner a selection.

Die Funktionsweise der erfindungsgemäßen Anordnung, die in Figur 1 dargestellt ist, ist folgende:
Zu Beginn jeder Umschaltung, d. h. jeder Betätigung des Lastumschalters dreht ein Motorantrieb über die nicht dargestellte Motorantriebswelle das Zahnrad 3. Diese Drehbewegung wird über die Verzahnung 5 auf das Antriebselement 4 übermittelt. Je nach Drehrichtung, die davon abhängt, ob die nächste Lastumschaltung in Richtung "höher" oder "tiefer" erfolgen soll, gerät einer der beiden Anschläge 6 oder 7 des Antriebselementes 4 in Formschluss mit der Antriebskurbel 8 und dreht diese mit. Dabei wird der an der Antriebskurbel 8 befestigte Zugstangenkopf 9 mitbewegt; die Zugstange 10 wird ausgelenkt und die Druckfedern 17, 18 werden gespannt. Nach einer Drehung der Antriebskurbel 8 um 180° hat die Zugstange 10 ihre neue Endstellung erreicht; die Druckfedern 17, 18 sind maximal gespannt, d. h. zusammengedrückt. Nach Überschreiten des Totpunktes gerät der bisher formschlüssig wirkende Anschlag 6 oder 7 außer Eingriff und die Drehbewegung der Antriebskurbel 8 und damit der Schaltwelle 11 wird schnell zu Ende geführt, da sich die Druckfedern 17, 18 sprungartig entspannen. Diese schnelle Drehbewegung wird über die Malteserkurbel 12 und das Malteserrad 13 auf die nicht dargestellte Schaltersäule des Laststufenschalters übertragen. Es erfolgt eine schnelle Umschaltung zwischen benachbarten festen Stufenkontakten im Isolierstoffzylinder.The operation of the inventive arrangement, the FIG. 1 is shown is the following:
At the beginning of each switching, ie each actuation of the diverter switch, a motor drive rotates the gear 3 via the motor drive shaft, not shown. This rotational movement is transmitted via the toothing 5 to the drive element 4. Depending on the direction of rotation, which depends on whether the next load switching should take place in the direction of "higher" or "lower", one of the two stops 6 or 7 of the drive element 4 is in positive engagement with the drive crank 8 and rotates with it. The attached to the drive crank 8 Zugstangenkopf 9 is moved; the tie rod 10 is deflected and the compression springs 17, 18 are tensioned. After a rotation of the drive crank 8 by 180 °, the pull rod 10 has reached its new end position; the compression springs 17, 18 are maximally tensioned, that is compressed. After exceeding the dead center of the hitherto positively acting stop 6 or 7 gets out of engagement and the rotational movement of the drive crank 8 and thus the shift shaft 11 is quickly brought to an end, as the compression springs 17, 18 relax abruptly. This fast rotational movement is transmitted via the Maltese crank 12 and the Geneva wheel 13 on the switch column, not shown, the on-load tap-changer. There is a quick switching between adjacent fixed stage contacts in Isolierstoffzylinder.

In Figur 2 ist die beschriebene erfindungsgemäße Anordnung noch einmal in seitlicher Schnittdarstellung gezeigt. Die aus dem Stand der Technik bekannten weiteren Bauelemente, die der Vollständigkeit halber mit dargestellt sind, werden nicht näher erläutert.
Es ist zu sehen, dass hier, nach einer besonders vorteilhaften Weiterbildung der Erfindung, die Zugstange 10 an einem Ende durch ein Gewinde 27 mit dem inneren Widerlager 20 verschraubt ist. Durch dieses Gewinde 27, besonders vorteilhaft als Feingewinde ausgebildet, ergibt sich eine verstellbare Zugstange 10, bei der die wirksame Länge zwischen festem Federwiderlager 19 und den beweglichen Federwiderlagern 20, 21 auf einfache Weise verändert werden kann. Damit ist eine kontinuierliche Einstellung der Federlängen der Druckfedern 17, 18 und damit der wirksamen Federkräfte auf einfache Weise möglich. Der Kraftspeicher kann in dieser Ausführungsform leicht an die spezifischen Anforderungen an die Energie der auslösten Kraftspeicherfedern angepasst werden, die abhängig von Schaltertyp und Schaltsequenz unterschiedlich sein kann.In FIG. 2 the described inventive arrangement is shown again in a side sectional view. The known from the prior art further components, which are shown for the sake of completeness, are not explained in detail.
It can be seen that here, according to a particularly advantageous embodiment of the invention, the tie rod 10 is screwed at one end by a thread 27 with the inner abutment 20. By this thread 27, particularly advantageously designed as a fine thread, there is an adjustable tie rod 10, in which the effective length between the fixed spring abutment 19 and the movable spring abutments 20, 21 can be changed in a simple manner. For a continuous adjustment of the spring lengths of the compression springs 17, 18 and thus the effective spring forces in a simple manner possible. The energy storage can in this Embodiment easily be adapted to the specific requirements of the energy of the released power storage springs, which may be different depending on switch type and switching sequence.

Es wäre im Rahmen der Erfindung auch möglich, die Verstellmöglichkeit der Zugstange 10 durch ein weiteres Gewinde 28 am Zugstangenkopf 9 zu realisieren.It would be within the scope of the invention also possible to realize the adjustment of the tie rod 10 by a further thread 28 on the tie rod end 9.

Claims (3)

  1. On-load tap changer with an energy storage mechanism for uninterrupted changing over between different winding taps of a tapped transformer under load,
    wherein the on-load tap changer comprises an insulating material cylinder, in the wall of which fixed tap contacts able to be electrically contacted are arranged,
    wherein centrally arranged in the interior of the insulating material cylinder is a rotatable switch column which is drivable by a drive crank and carries at least one switching element able to be contacted with the fixed tap contacts,
    and wherein the drive crank is mechanically connected with two energy storage springs in such a manner that at the beginning of each changeover the drive crank is rotated and the two energy storage springs are stressed,
    characterised in that
    the two energy storage springs are compression springs (17, 18) which are each supported by one end thereof at a common fixed spring counter-bearing (19),
    a tie rod (10) is arranged at the drive crank (8),
    a spring tube (14) pivotably connected with a bearing block (15) is provided around the tie rod (10),
    the fixed spring counter-bearing (19) is fastened to the spring tube (14),
    one compression spring (17, 18) is arranged within the spring tube (14) and the other compression spring (18) is arranged concentrically outside the spring tube (14) and surrounding this,
    arranged at the tie rod (10) is an inner movable spring counter-bearing (20) as well as an outer movable spring counter-bearing (21), at each of which the other end of a respective one of the two compression springs (17, 18) is supported,
    the inner spring counter-bearing (20) within the spring tube (14) is fastened directly to the tie rod and
    the outer spring counter-bearing (21) outside the spring tube (14) is connected with the tie rod (10) by means of a fastening pin (23) which projects outwardly through longitudinal cut-outs (22) in the spring tube (14).
  2. On-load tap changer according to claim 1, characterised in that the tie rod (10) is directly screwed to the movable inner spring counter-bearing (20) by means of a thread (27).
  3. On-load tap changer according to claim 1 or 2, characterised in that the tie rod (10) is screwed to a tie rod head (9), which is rotatably mounted on the drive crank (8), by means of a further thread (28).
EP06818371A 2006-02-23 2006-11-04 On-load tap changer with an energy storage mechanism Active EP1991998B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006008338A DE102006008338B3 (en) 2006-02-23 2006-02-23 Load-tap changer with power storage spring e.g., for variable transformers, has power storage spring as pressure spring supported on end by fixed spring abutment
PCT/EP2006/010580 WO2007095978A1 (en) 2006-02-23 2006-11-04 On-load tap changer with an energy storage mechanism

Publications (2)

Publication Number Publication Date
EP1991998A1 EP1991998A1 (en) 2008-11-19
EP1991998B1 true EP1991998B1 (en) 2013-01-16

Family

ID=37681349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06818371A Active EP1991998B1 (en) 2006-02-23 2006-11-04 On-load tap changer with an energy storage mechanism

Country Status (11)

Country Link
US (1) US8119939B2 (en)
EP (1) EP1991998B1 (en)
JP (1) JP4682252B2 (en)
KR (1) KR101359592B1 (en)
CN (1) CN101336462B (en)
BR (1) BRPI0621371B1 (en)
DE (1) DE102006008338B3 (en)
HK (1) HK1122397A1 (en)
RU (1) RU2408106C2 (en)
UA (1) UA91736C2 (en)
WO (1) WO2007095978A1 (en)

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CN111863474B (en) * 2020-07-14 2023-03-28 上海华明电力设备制造有限公司 Conversion mechanism of on-load tap-changer
CN113113245B (en) * 2021-03-01 2023-12-12 北京航天控制仪器研究所 Split type on-load tap-changer
EP4123677A1 (en) 2021-07-23 2023-01-25 Hitachi Energy Switzerland AG On-load tap changer with positioning device and method for assembling an on-load tap changer
CN114599178B (en) * 2022-03-09 2024-04-26 安徽嘉晨智能电子科技有限公司 Software defined voltage converter

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Also Published As

Publication number Publication date
US20090000927A1 (en) 2009-01-01
JP4682252B2 (en) 2011-05-11
BRPI0621371B1 (en) 2017-01-31
HK1122397A1 (en) 2009-05-15
DE102006008338B3 (en) 2007-02-15
WO2007095978A1 (en) 2007-08-30
UA91736C2 (en) 2010-08-25
RU2008137773A (en) 2010-03-27
EP1991998A1 (en) 2008-11-19
JP2009527907A (en) 2009-07-30
RU2408106C2 (en) 2010-12-27
KR101359592B1 (en) 2014-02-21
CN101336462B (en) 2012-09-05
BRPI0621371A2 (en) 2011-12-06
KR20080114698A (en) 2008-12-31
CN101336462A (en) 2008-12-31
US8119939B2 (en) 2012-02-21

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