EP2981979B1 - Method for performing a switching process in an on-load tap changer - Google Patents

Method for performing a switching process in an on-load tap changer Download PDF

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Publication number
EP2981979B1
EP2981979B1 EP14716255.6A EP14716255A EP2981979B1 EP 2981979 B1 EP2981979 B1 EP 2981979B1 EP 14716255 A EP14716255 A EP 14716255A EP 2981979 B1 EP2981979 B1 EP 2981979B1
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EP
European Patent Office
Prior art keywords
switching
voltage
phase
electric drive
during
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EP14716255.6A
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German (de)
French (fr)
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EP2981979A1 (en
Inventor
Thomas Strof
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Maschinenfabrik Reinhausen GmbH
Scheubeck GmbH and Co
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Maschinenfabrik Reinhausen GmbH
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F5/00—Systems for regulating electric variables by detecting deviations in the electric input to the system and thereby controlling a device within the system to obtain a regulated output
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current

Definitions

  • the invention relates to a method for performing a switching operation in an on-load tap changer between winding taps of a tapped transformer.
  • On-load tap-changers have been in worldwide use for many years for uninterrupted switching between different winding taps of tapped transformers in large numbers. So-called reactor switches, which are particularly common in North America, have a switching reactance, which allows a slow, continuous switching.
  • On-load tap changers according to the resistance fast-switching principle usually consist of a selector for powerless selection of the respective winding tap of the tapped transformer to be switched to, and a diverter switch for the actual switching from the previous to the new, preselected winding tapping.
  • the diverter switch usually has switching contacts and resistance contacts.
  • the switch contacts are used for direct connection of the respective winding tap with the load dissipation, the resistor contacts for short-term wiring, d. H. Bridging by means of one or more switching resistors.
  • Such on-load tap changer with vacuum interrupters is for example from the DE 10 2009 043 171 A1 known.
  • a diverter switch carries a drivable by a power storage drive shaft with at least one cam.
  • the cam has a plurality of control cams, wherein two arranged on the cam front control cams have a deviating from a circular contour contour on the type of cam on the contact one each connected via a rocker arm with a vacuum interrupter roller is performed, the profiled contour of the respective control cam taps.
  • this on-load tap-changer requires a spring energy storage for sudden switching by means of the contact system.
  • known energy storage are mounted at the beginning of each actuation of the on-load tap-changer by a drive shaft, that is stretched.
  • the known energy storage consist essentially of a lift carriage and a jump carriage, between which power storage springs are arranged as energy storage.
  • Such energy storage are, for example, the DE 198 55 860 C1 as well as the DE 28 06 282 B1 removable.
  • the on-load tap-changers are used for a long time, it often happens that the pressure or tension springs break and thus prevent a changeover.
  • the shift shaft thus does not rotate completely and the switch contacts do not reach their end position. In the worst case, this can lead to the destruction of the entire tapped transformer.
  • the object of the invention is therefore to provide a method for performing a switching operation in an on-load tap-changer, in order to increase the safety of on-load tap-changers.
  • the general inventive idea consists in a method for carrying out a changeover operation of an on-load tap changer, which subdivide the switching sequence underlying the switching operation in several phases, the critical and uncritical switching states of each switch contacts used to monitor each of these phases during a switching operation and in dependence on a parameterized in a controller decision logic that processes the detected at the beginning of an intended switching operation by a voltage monitoring device value of the supply voltage as basis for decision and only then starts the switching or enters the next defined phase of the switching, when a supply voltage is detectable and
  • a voltage drop of the mains or supply voltage and thus in case of failure of the power supply of the electric drive, during a switching operation using the existing in the capacitors of the control energy overcomes each identified for a switching sequence critical switching states of the respective switching contacts over by the next, as uncritically identified phase of the switching states is switched.
  • a voltage monitoring device checks whether a voltage is applied to a selected phase line. If the voltage is not applied, the changeover is aborted and continued when the voltage is applied.
  • an electric drive is actuated via a controller which opens the second switching contact.
  • the power supply to the electric drive is monitored by a controller.
  • a voltage dip in the power supply of the electric drive energy from the capacitors of the controller is used to fully open the second switching contact.
  • an adjacent winding tap is approached by a second selector contact.
  • the electric drive is actuated via a controller and thereby the second switching contact is closed.
  • the power supply of the electric drive is monitored by the controller and the energy from capacitors of the controller is used to fully close the second switching contact at a voltage dip of the power supply of the electric drive.
  • the first selector contact is applied to one winding tap and the second selector contact is applied to the adjacent winding tap.
  • the first and the second switching contact are closed. During this time, a circulating current Ik is created.
  • the continuation of the switchover is checked by the voltage monitoring device as to whether a voltage is applied to a selected phase line. If the voltage is not present, the changeover is aborted, and the voltage continues.
  • the seventh, following phase an adjacent winding tap is approached by the first selector contact.
  • the electric drive is actuated via a controller and the first switching contact is closed.
  • the power supply of the electric drive is monitored by a controller and used in a voltage dip in the power supply of the electric drive, the energy from capacitors of the controller to fully close the first switching contact.
  • the switching is completed.
  • FIG. 1 shows a schematic view of an on-load tap changer with necessary means for performing a switching operation, in which critical positions are avoided.
  • FIGS. 2a-2i is an exemplary switching operation of an on-load tap changer, which operates on the reactor switching principle, mapped.
  • FIG. 3 shows a schematic flowchart with different phases during a switching operation.
  • FIG. 1 is an on-load tap-changer 1, according to the reactor switching principle, which is located in a tapped transformer 2, shown.
  • the step-up transformer 2 has a high-voltage side 3, to which the on-load tap-changer 2 is arranged, and an undervoltage side 4. Both the high-voltage side 3 and the low-voltage side 4 each have three phase lines L1, L2, L3, I1, I2, I3.
  • the on-load tap-changer 1 is actuated by an electric drive 5.
  • a controller 6 initiates the individual switching operations of the electric drive 5.
  • the controller 6 is connected via a controller 7 to the electric drive 5 and to a voltage monitoring device 8, referred to below as SUV 8.
  • the SUV 8 monitors the voltage of the individual phase lines I1, I2 and I3 on the low-voltage side 4.
  • the power supply of the electric drive 5 via one of these phase lines I1 the low-voltage side 4 via a line 9. However, this is each of the located on the undervoltage side 4 phase line I1, I2, or I
  • buffer capacitors are arranged, which are able to store a defined amount of energy. These are often components of the controller 6, but can also be retrofitted.
  • the Energy from a phase line I1, I2, or I3 used to open or close the located in the interior of the on-load tap changer 1 switching contacts V1, V2, in particular vacuum interrupters.
  • the critical positions arise during this switching process, in particular during the so-called hard opening or hard closing of the switching contacts. Hard opening or closing occurs when the contacts are under load, ie they carry a current. This creates arcs inside the switching contacts, which have an effect on the life of the contacts and can even lead to destruction if the burning time is too long.
  • FIGS. 2a-2i is an exemplary switching operation of an on-load tap-changer 1, which operates on the reactor switching principle shown.
  • the on-load tap-changer 1 consists of a first and a second switching contact V1 and V2, a first and a second movable selector contact W1 and W2 and a first and a second over-reacting X1 and X2.
  • a load dissipation Y is disposed between the first and second reactances X1 and X2.
  • the switching operation takes place from a first tap n a step winding to an adjacent second winding tap n + 1 a step winding of a tapped transformer 2, wherein an intermediate position n + 1/2 is allowed as a stationary operating position.
  • FIG. 2b the second switching contact V2 is opened, so that the second selector contact W2 can first be disconnected from the winding tapping n currentless.
  • the selector contact W2 moves to the second tap n + 1.
  • Figure 2d the switching contact V2 is closed. This leads to the so-called circular current Ik, FIG. 2e ,
  • the reactances X1 and X2 allow the on-load tap-changer 1 to remain in this position. This position is referred to as intermediate n + 1/2.
  • phase (I) FIG. 2a
  • the switchover is initiated.
  • the second switching contact V2 is opened.
  • the third phase (III) Figure 2c the adjacent second winding tap n + 1 is approached by the second selector contact W2.
  • phase four (IV) the second switching contact V2 is closed.
  • phase five (V) Figure 2d
  • both switch contacts V1 and V2 are closed.
  • phase six (VI) will the first switching contact V1 opened.
  • phase seven (VII) Figure 2g
  • the first selector contact W1 drives the adjacent second winding tap n + 1.
  • phase eight (VIII) of the first switching contact V1 is closed.
  • phase nine (IX) the switching process is completed.
  • the method according to the invention is represented by a schematic flow chart.
  • the SUV 8 upon initiation of the switching operation in the first phase (I), the SUV 8 first of all checks whether a voltage is applied to the phase line I1, I2, I3 selected for the energy supply. If this is not the case, the switching operation is not performed and the on-load tap-changer 1 remains in this position or the entire tapped transformer 2 is switched off. If a voltage is applied, the electric drive 5 is actuated via the controller 6.
  • the second switching contact V2 is opened.
  • This phase is to be regarded as a critical switching state, since it can come to a not completely open second switching contact V2 for non-extinction of the arc.
  • the controller 7 monitors during this time the power supply of the electric drive 5. If it comes during this phase (II) to a voltage dip, so a failure of the power supply, this is detected by the grain roller 7 and using the existing energy in the controller 6, from the previously charged capacitors, compensated, ie the second switching contact V2 is fully opened.
  • phase (III) When the opening is completed, in the third phase (III), the adjacent tap n + 1 is approached by the second selector contact W2.
  • phase four (IV) the power supply is monitored by the controller 7.
  • This phase (IV) is also to be regarded as a critical switching state, since it can lead to pre-ignition and subsequent non-extinction of the arc at a not completely closed second switching contact V2.
  • this is detected by the grain roller 7 and compensated by means of the energy present in the controller 6, from the previously charged capacitors, i. the second switching contact V2 is completely closed.
  • the fifth phase (V) ie after the second switching contact V2 has been closed, the so-called circular current Ik arises. This switching state is not critical.
  • phase six Before the opening of the first switching contact V1, ie phase six (VI), it is checked again whether a voltage is applied to the phase line I1, I2, I3 selected for the energy supply is applied. If this is not the case, the switching process is not performed and the on-load tap-changer remains in this position or the entire tapped transformer is switched off. In phase seven (VII), the adjacent tap n + 1 is approached. In the eighth phase (VIII), the first switching contact V1 is closed. The controller 7 monitors during this time the power supply of the electric drive 5. If it comes during this phase to a voltage dip, ie a failure of the power supply, this is detected by the grain roller 7 and with the help of existing in the controller 6, already pre-charged capacitors compensated. In the last phase, the switching process is completed.
  • Phases of switching I - Initiation of a changeover Checking the voltage of a selected phase line by means of SUV - Carrying out the changeover with applied voltage - Abort of the changeover when voltage is not present II - Actuation of the electric drive by means of control - Opening the second switching contact - Monitoring the voltage using a controller - Use of the energy of the capacitors from the controller at voltage dip for complete opening of the second Schaltempoes III - Approaching the adjacent winding tap by the second selector contact IV - Actuation of the electric drive by means of control - Close the second switching contact - Monitoring the voltage using a controller - Use of the energy of the capacitors from the controller at voltage dip for complete closing of the second Schaltempoes V - Stay with completely closed switching contacts - Origin of the circulating current - Checking the voltage of a selected phase line by means of SUV - Carrying out the changeover with applied voltage - Abort of the changeover when voltage is not present VI - Actuation of the electric drive

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)
  • Protection Of Transformers (AREA)
  • Keying Circuit Devices (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Durchführung eines Umschaltvorgangs in einem Laststufenschalter zwischen Wicklungsanzapfungen eines Stufentransformators.The invention relates to a method for performing a switching operation in an on-load tap changer between winding taps of a tapped transformer.

Laststufenschalter sind seit vielen Jahren zur unterbrechungslosen Umschaltung zwischen verschiedenen Wicklungsanzapfungen von Stufentransformatoren in großen Zahlen weltweit im Einsatz. Sogenannte Reaktorschalter, die besonders in Nord-Amerika verbreitet sind, besitzen eine Umschaltreaktanz, die eine langsame, kontinuierliche Umschaltung ermöglicht. Laststufenschalter nach dem Widerstandsschnellschalt-Prinzip bestehen üblicherweise aus einem Wähler zur leistungslosen Anwahl der jeweiligen Wicklungsanzapfung des Stufentransformators, auf die umgeschaltet werden soll, und einem Lastumschalter zur eigentlichen Umschaltung von der bisherigen auf die neue, vorgewählte Wicklungsanzapfung. Der Lastumschalter weist dazu üblicherweise Schaltkontakte und Widerstandskontakte auf. Die Schaltkontakte dienen dabei zur direkten Verbindung der jeweiligen Wicklungsanzapfung mit der Lastableitung, die Widerstandskontakte zur kurzzeitigen Beschaltung, d. h. Überbrückung mittels eines oder mehrerer Überschaltwiderstände. Die Entwicklungen der letzten Jahre führten jedoch weg von Lastumschaltern mit mechanischen Schaltkontakten im Isolieröl. Stattdessen werden vermehrt Vakuumschaltzellen als Schaltelemente eingesetzt.On-load tap-changers have been in worldwide use for many years for uninterrupted switching between different winding taps of tapped transformers in large numbers. So-called reactor switches, which are particularly common in North America, have a switching reactance, which allows a slow, continuous switching. On-load tap changers according to the resistance fast-switching principle usually consist of a selector for powerless selection of the respective winding tap of the tapped transformer to be switched to, and a diverter switch for the actual switching from the previous to the new, preselected winding tapping. The diverter switch usually has switching contacts and resistance contacts. The switch contacts are used for direct connection of the respective winding tap with the load dissipation, the resistor contacts for short-term wiring, d. H. Bridging by means of one or more switching resistors. The developments of recent years, however, led away from load switches with mechanical switching contacts in insulating oil. Instead, more and more vacuum switching cells are used as switching elements.

Ein derartiger Laststufenschalter mit Vakuumschaltröhren ist beispielsweise aus der DE 10 2009 043 171 A1 bekannt. Hier trägt ein Lastumschalter eine von einem Kraftspeicher antreibbare Antriebswelle mit mindestens einer Kurvenscheibe. Die Kurvenscheibe weist mehrere Steuerkurven auf, wobei zwei an der Kurvenscheibe stirnseitig angeordnete Steuerkurven eine von einer Kreisform abweichende Kontur nach Art von Nocken aufweisen, an der kontaktschlüssig jeweils eine über einen Kipphebel mit einer Vakuumschaltröhre verbundene Rolle geführt wird, die die profilierte Kontur der jeweiligen Steuerkurve abgreift.Such on-load tap changer with vacuum interrupters is for example from the DE 10 2009 043 171 A1 known. Here, a diverter switch carries a drivable by a power storage drive shaft with at least one cam. The cam has a plurality of control cams, wherein two arranged on the cam front control cams have a deviating from a circular contour contour on the type of cam on the contact one each connected via a rocker arm with a vacuum interrupter roller is performed, the profiled contour of the respective control cam taps.

Auf Grund des konstruktiven Aufbaus dieses Laststufenschalters bedarf es bei diesem eines Federenergiespeichers zum sprungartigen Umschalten mittels des Kontaktsystems. Aus dem Stand der Technik bekannte Kraftspeicher werden zu Beginn jeder Betätigung des Laststufenschalters von einer Antriebswelle aufgezogen, d. h. gespannt. Die bekannten Kraftspeicher bestehen im Wesentlichen aus einem Aufzugsschlitten und einem Sprungschlitten, zwischen denen Kraftspeicherfedern als Energiespeicher angeordnet sind.Due to the constructive design of this on-load tap-changer, this requires a spring energy storage for sudden switching by means of the contact system. From the prior art known energy storage are mounted at the beginning of each actuation of the on-load tap-changer by a drive shaft, that is stretched. The known energy storage consist essentially of a lift carriage and a jump carriage, between which power storage springs are arranged as energy storage.

Derartige Kraftspeicher sind beispielsweise der DE 198 55 860 C1 sowie der DE 28 06 282 B1 entnehmbar. Trotz dieser über Jahrzehnte genutzter Energiespeicher kommt es immer wieder zum Versagen dieser Vorrichtungen. Da die Laststufenschalter über lange Zeit genutzt werden, kommt es immer wieder vor, dass die Druck- bzw. Zugfedern brechen und damit eine Umschaltung verhindern. Weiterhin kann es vorkommen, dass ein Schlitten die Endposition nicht erreicht, die Schaltwelle somit nicht vollständig dreht und die Schaltkontakte nicht deren Endposition erreichen. Dies kann im schlimmsten Fall zur Zerstörung des gesamten Stufentransformators führen.Such energy storage are, for example, the DE 198 55 860 C1 as well as the DE 28 06 282 B1 removable. Despite these decades of used energy storage, it comes again and again to the failure of these devices. Since the on-load tap-changers are used for a long time, it often happens that the pressure or tension springs break and thus prevent a changeover. Furthermore, it may happen that a carriage does not reach the end position, the shift shaft thus does not rotate completely and the switch contacts do not reach their end position. In the worst case, this can lead to the destruction of the entire tapped transformer.

Neuste Laststufenschaltermodelle der Anmelderin haben im Vergleich zum Stand der Technik keine mechanischen Kraftspeicher zur Durchführung von Umschaltungen. Die Betätigung erfolgt direkt über einen Elektroantrieb. Bei einem plötzlichen Ausfall der Energieversorgung für einen solchen Antrieb während einer Umschaltung kann es jedoch zu kritischen Stellungen im Laststufenschalter kommen. Diese sind insbesondere kurz vor dem Schließen oder nach dem Öffnen eines Schaltkontaktes. Hierbei kann es z.B. zu einem Verschweißen der Kontakte im Inneren der Vakuumschaltröhre kommen.The latest on-load tap-changer models of the applicant have no mechanical energy storage for performing switching compared to the prior art. Actuation takes place directly via an electric drive. In the event of a sudden failure of the power supply for such a drive during a changeover, however, critical positions can occur in the on-load tap-changer. These are especially close to closing or after opening a switching contact. Hereby, it may e.g. come to a welding of the contacts inside the vacuum interrupter.

Aufgabe der Erfindung ist es somit, ein Verfahren zur Durchführung eines Umschaltvorgangs in einem Laststufenschalter bereitzustellen, um damit die Sicherheit von Laststufenschaltern zu erhöhen.The object of the invention is therefore to provide a method for performing a switching operation in an on-load tap-changer, in order to increase the safety of on-load tap-changers.

Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des ersten Patentanspruches gelöst. Die Unteransprüche betreffen besonders vorteilhafte Weiterbildungen des Verfahrens.This object is achieved by a method having the features of the first claim. The subclaims relate to particularly advantageous developments of the method.

Die allgemeine erfinderische Idee besteht dabei darin, in einem Verfahren zur Durchführung eines Umschaltvorgangs eines Laststufenschalters, die dem Umschaltvorgang zu Grunde liegende Schaltsequenz in mehrere Phasen zu unterteilen, die kritische und unkritische Schaltzustände der jeweils verwendeten Schaltkontakte identifiziert, jede dieser Phasen während eines Umschaltvorgangs zu überwachen und in Abhängigkeit einer in einem Kontroller parametrierten Entscheidungslogik, die den zu Beginn eines intendierten Umschaltvorgangs mittels einer Spannungsüberwachungsvorrichtung detektierten Wert der Versorgungsspannung als Entscheidungsgrundlage verarbeitet und nur dann den Umschaltvorgang startet bzw. in die nächste definierte Phase des Umschaltvorgangs eintritt, wenn eine Versorgungsspannung detektierbar ist und zudem bei einem Spannungseinbruch der Netz- bzw. Versorgungsspannung, und damit bei einem Ausfall der Energieversorgung des Elektroantriebs, während eines Umschaltvorgangs mit Hilfe der in den Kondensatoren der Steuerung vorhandenen Energie die jeweils für eine Umschaltsequenz identifizierten kritischen Schaltzustände der jeweiligen Schaltkontakte überwindet, indem in die nächstfolgende, als unkritisch identifizierte Phase der Schaltzustände weiterschaltet wird.The general inventive idea consists in a method for carrying out a changeover operation of an on-load tap changer, which subdivide the switching sequence underlying the switching operation in several phases, the critical and uncritical switching states of each switch contacts used to monitor each of these phases during a switching operation and in dependence on a parameterized in a controller decision logic that processes the detected at the beginning of an intended switching operation by a voltage monitoring device value of the supply voltage as basis for decision and only then starts the switching or enters the next defined phase of the switching, when a supply voltage is detectable and In addition, at a voltage drop of the mains or supply voltage, and thus in case of failure of the power supply of the electric drive, during a switching operation using the existing in the capacitors of the control energy overcomes each identified for a switching sequence critical switching states of the respective switching contacts over by the next, as uncritically identified phase of the switching states is switched.

Erfindungsgemäß wird dabei nach der Initiierung der Umschaltung in der ersten Phase von einer Spannungsüberwachungseinrichtung überprüft, ob an einer ausgewählten Phasenleitung eine Spannung anliegt. Bei einer nicht anliegenden Spannung wird die Umschaltung abgebrochen und bei anliegender Spannung fortgesetzt.According to the invention, after the initiation of the switching in the first phase, a voltage monitoring device checks whether a voltage is applied to a selected phase line. If the voltage is not applied, the changeover is aborted and continued when the voltage is applied.

Während der zweiten Phase des erfindungsgemäßen Verfahrens wird ein Elektroantrieb über eine Steuerung betätigt der dabei den zweiten Schaltkontakt öffnet. Während dem Öffnen wird die Energieversorgung des Elektroantriebs von einem Kontroller überwacht. Bei einem Spannungseinbruch an der Energieversorgung des Elektroantriebs wird Energie aus den Kondensatoren der Steuerung zum vollständigen Öffnen des zweiten Schaltkontaktes verwendet. Im Anschluss, also während der dritten Phase, wird eine benachbarte Wicklungsanzapfung durch einen zweiten Wählerkontakt angefahren.During the second phase of the method according to the invention, an electric drive is actuated via a controller which opens the second switching contact. During opening, the power supply to the electric drive is monitored by a controller. When a voltage dip in the power supply of the electric drive energy from the capacitors of the controller is used to fully open the second switching contact. Following, ie during the third phase, an adjacent winding tap is approached by a second selector contact.

Während der vierten Phase des erfindungsgemäßen Verfahrens wird der Elektroantrieb über eine Steuerung betätigt und dabei der zweite Schaltkontakt geschlossen. Während dem Schließen wird die Energieversorgung des Elektroantriebs von dem Kontroller überwacht wird und bei einem Spannungseinbruch der Energieversorgung des Elektroantriebs die Energie aus Kondensatoren der Steuerung zum vollständigen Schließen des zweiten Schaltkontaktes verwendet.During the fourth phase of the method according to the invention, the electric drive is actuated via a controller and thereby the second switching contact is closed. During closing, the power supply of the electric drive is monitored by the controller and the energy from capacitors of the controller is used to fully close the second switching contact at a voltage dip of the power supply of the electric drive.

Während der fünften Phase des erfindungsgemäßen Verfahrens liegen der erste Wählerkontakt an einer Wicklungsanzapfung und der zweite Wählerkontakt an der benachbarten Wicklungsanzapfung an. Der erste und der zweite Schaltkontakt sind dabei geschlossen. Während dieser Zeit entsteht ein Kreisstrom Ik.During the fifth phase of the method according to the invention, the first selector contact is applied to one winding tap and the second selector contact is applied to the adjacent winding tap. The first and the second switching contact are closed. During this time, a circulating current Ik is created.

Während der sechsten Phase des erfindungsgemäßen Verfahrens wird vor der Fortsetzung der Umschaltung von der Spannungsüberwachungseinrichtung überprüft, ob an einer ausgewählten Phasenleitung eine Spannung anliegt. Bei einer nicht anliegenden Spannung wird die Umschaltung abgebrochen, bei anliegender Spannung fortgesetzt. Während der siebten, folgenden Phase wird eine benachbarte Wicklungsanzapfung durch den ersten Wählerkontakt angefahren.During the sixth phase of the method according to the invention, the continuation of the switchover is checked by the voltage monitoring device as to whether a voltage is applied to a selected phase line. If the voltage is not present, the changeover is aborted, and the voltage continues. During the seventh, following phase, an adjacent winding tap is approached by the first selector contact.

Während der achten Phase des erfindungsgemäßen Verfahrens wird der Elektroantrieb über eine Steuerung betätigt und der erste Schaltkontakt geschlossen. Während des Schließens wird die Energieversorgung des Elektroantriebs von einem Kontroller überwacht und bei einem Spannungseinbruch an der Energieversorgung des Elektroantriebs die Energie aus Kondensatoren der Steuerung zum vollständigen Schließen des ersten Schaltkontaktes verwendet. In der neunten Phase wird die Umschaltung beendet.During the eighth phase of the method according to the invention, the electric drive is actuated via a controller and the first switching contact is closed. During closing, the power supply of the electric drive is monitored by a controller and used in a voltage dip in the power supply of the electric drive, the energy from capacitors of the controller to fully close the first switching contact. In the ninth phase, the switching is completed.

Das erfindungsgemäße Verfahren soll nachfolgend beispielhaft näher erläutert werden.The inventive method will be explained in more detail by way of example below.

Figur 1 zeigt eine schematische Ansicht eines Laststufenschalters mit erforderlichen Mitteln zur Durchführung einer Umschaltvorgangs, bei der kritische Stellungen vermieden werden. FIG. 1 shows a schematic view of an on-load tap changer with necessary means for performing a switching operation, in which critical positions are avoided.

In den Figuren 2a - 2i ist ein beispielhafter Umschaltvorgang eines Laststufenschalters, der nach dem Reaktorschaltprinzip arbeitet, abgebildet.In the FIGS. 2a-2i is an exemplary switching operation of an on-load tap changer, which operates on the reactor switching principle, mapped.

Figur 3 zeigt einen schematischen Ablaufplan mit unterschiedlichen Phasen während eines Umschaltvorgangs. FIG. 3 shows a schematic flowchart with different phases during a switching operation.

In Figur 1 ist ein Laststufenschalter 1, nach dem Reaktorschaltprinzip, der sich in einem Stufentransformator 2 befindet, dargestellt. Der Stufentransformator 2 weist eine Oberspannungsseite 3, wobei an dieser der Laststufenschalter 2 angeordnet ist, und eine Unterspannungsseite 4 auf. Sowohl die Oberspannungsseite 3 als auch die Unterspannungsseite 4 weisen jeweils drei Phasenleitungen L1, L2, L3, I1, I2, I3 auf. Der Laststufenschalter 1 wird durch einen Elektroantrieb 5 betätigt. Eine Steuerung 6 initiiert die einzelnen Schalthandlungen des Elektroantriebes 5. Die Steuerung 6 ist über einen Kontroller 7 mit dem Elektroantrieb 5 und mit einer Spannungsüberwachungsvorrichtung 8, im Weiteren als SUV 8 bezeichnet, verbunden. Die SUV 8 überwacht die Spannung der einzelnen Phasenleitungen I1, I2 und I3 auf der Unterspannungsseite 4. Die Energieversorgung des Elektroantriebes 5 erfolgt über eine dieser Phasenleitungen I1 der Unterspannungsseite 4 über eine Leitung 9. Hierfür ist jedoch jede der sich auf der Unterspannungsseiten 4 befindenden Phasenleitung I1, I2, oder I3 geeignet.In FIG. 1 is an on-load tap-changer 1, according to the reactor switching principle, which is located in a tapped transformer 2, shown. The step-up transformer 2 has a high-voltage side 3, to which the on-load tap-changer 2 is arranged, and an undervoltage side 4. Both the high-voltage side 3 and the low-voltage side 4 each have three phase lines L1, L2, L3, I1, I2, I3. The on-load tap-changer 1 is actuated by an electric drive 5. A controller 6 initiates the individual switching operations of the electric drive 5. The controller 6 is connected via a controller 7 to the electric drive 5 and to a voltage monitoring device 8, referred to below as SUV 8. The SUV 8 monitors the voltage of the individual phase lines I1, I2 and I3 on the low-voltage side 4. The power supply of the electric drive 5 via one of these phase lines I1 the low-voltage side 4 via a line 9. However, this is each of the located on the undervoltage side 4 phase line I1, I2, or I3 suitable.

Im Inneren der Steuerung 6 sind Pufferkondensatoren angeordnet, die in der Lage sind eine definierte Energiemenge zu speichern. Diese sind oftmals Bestandteile der Steuerung 6, können jedoch auch nachträglich nachgerüstet werden. Bei der Initiierung eines Umschaltvorganges des Laststufenschalters 1, von einer Anzapfung n über eine Zwischenstufe n+1/2 zu einer nächsten Anzapfung n+1 des Stufentransformators, wird die Energie aus einer Phasenleitung I1, I2, oder I3 dazu verwendet, die sich im Inneren der Laststufenschalters 1 befindenden Schaltkontakte V1, V2, insbesondere Vakuumschaltröhren, zu öffnen bzw. zu schließen. Die kritischen Stellungen entstehen bei diesem Umschaltvorgang insbesondere beim sogenannten harten Öffnen bzw. beim harten Schließen der Schaltkontakte. Hartes Öffnen bzw. Schließen entsteht wenn die Kontakte unter Last stehen, d.h. einen Strom führen. Hierbei entstehen im Inneren der Schaltkontakte Lichtbögen, welche sich auf die Lebensdauer der Kontakte auswirken und bei zu langer Brenndauer sogar zu Zerstörungen führen können.Inside the controller 6 buffer capacitors are arranged, which are able to store a defined amount of energy. These are often components of the controller 6, but can also be retrofitted. At the initiation of a switching operation of the on-load tap-changer 1, from a tap n via an intermediate stage n + 1/2 to a next tap n + 1 of the tap-changer, the Energy from a phase line I1, I2, or I3 used to open or close the located in the interior of the on-load tap changer 1 switching contacts V1, V2, in particular vacuum interrupters. The critical positions arise during this switching process, in particular during the so-called hard opening or hard closing of the switching contacts. Hard opening or closing occurs when the contacts are under load, ie they carry a current. This creates arcs inside the switching contacts, which have an effect on the life of the contacts and can even lead to destruction if the burning time is too long.

In den Figuren 2a - 2i ist ein beispielhafter Umschaltvorgang eines Laststufenschalters 1, der nach dem Reaktorschaltprinzip arbeitet, dargestellt. Der Laststufenschalter 1 besteht aus einem ersten und einem zweiten Schaltkontakt V1 und V2, einem ersten und einem zweiten beweglichen Wählerkontakt W1 und W2 sowie einer ersten und einer zweiten Überschaltreaktanz X1 und X2. Zusätzlich ist eine Lastableitung Y zwischen der ersten und der zweiten Reaktanz X1 und X2 angeordnet. Der Umschaltvorgang erfolgt von einer ersten Anzapfung n einer Stufenwicklung zu einer benachbarten zweiten Wicklungsanzapfung n+1 einer Stufenwicklung eines Stufentransformators 2, wobei eine Zwischenstellung n+1/2 als stationäre Betriebsstellung zulässig ist.In the FIGS. 2a-2i is an exemplary switching operation of an on-load tap-changer 1, which operates on the reactor switching principle shown. The on-load tap-changer 1 consists of a first and a second switching contact V1 and V2, a first and a second movable selector contact W1 and W2 and a first and a second over-reacting X1 and X2. In addition, a load dissipation Y is disposed between the first and second reactances X1 and X2. The switching operation takes place from a first tap n a step winding to an adjacent second winding tap n + 1 a step winding of a tapped transformer 2, wherein an intermediate position n + 1/2 is allowed as a stationary operating position.

Zu Beginn eines Umschaltvorganges, Figur 2b, wird der zweite Schaltkontakt V2 geöffnet, sodass der zweite Wählerkontakt W2 zunächst von der Wicklungsanzapfung n stromlos gelöst werden kann. Im Anschluss, Figur 2c, bewegt sich der Wählerkontakt W2 zur zweiten Anzapfung n+1. Nach dem Erreichen der zweiten Wicklungsanzapfung n+1, Figur 2d, wird der Schaltkontakt V2 geschlossen. Dabei kommt es zum sogenannten Kreisstrom Ik, Figur 2e. Die Reaktanzen X1 und X2 erlauben es, dass der Laststufenschalter 1 in diese Position stehen bleiben kann. Diese Stellung wird als Zwischenstufe n+1/2 bezeichnet. Nach dem Öffnen der ersten Vakuumschaltröhre V1, Figur 2f, wird der Kreisstrom Ik unterbrochen und der erste Wählerkontakt W1 bewegt sich in Richtung der zweiten Wicklungsanzapfung n+1, Figur 2g. Sobald der der erste Wählerkontakt W1 an der Wicklungsanzapfung n+1 angelangt ist, Figur h und Figur i, wird der erste Schaltkontakt V1 geschlossen.At the beginning of a switching process, FIG. 2b , the second switching contact V2 is opened, so that the second selector contact W2 can first be disconnected from the winding tapping n currentless. In connection, Figure 2c , the selector contact W2 moves to the second tap n + 1. After reaching the second winding tapping n + 1, Figure 2d , the switching contact V2 is closed. This leads to the so-called circular current Ik, FIG. 2e , The reactances X1 and X2 allow the on-load tap-changer 1 to remain in this position. This position is referred to as intermediate n + 1/2. After opening the first vacuum interrupter V1, FIG. 2f , the circulating current Ik is interrupted and the first selector contact W1 moves in the direction of the second winding tapping n + 1, Figure 2g , As soon as the first selector contact W1 has arrived at the winding tap n + 1, FIG. 1 and FIG. 1, the first switching contact V1 is closed.

Dieser Umschaltvorgang kann somit erfindungsgemäß in neun Phasen unterteilt werden. In der ersten Phase (I) (Figur 2a) wird die Umschaltung initiiert. In der zweiten Phase (II) wird der zweite Schaltkontakt V2 geöffnet. In der dritten Phase (III) (Figur 2c) wird die benachbarte zweite Wicklungsanzapfung n+1 von dem zweiten Wählerkontakt W2 angefahren. In Phase vier (IV) wird der zweite Schaltkontakt V2 geschlossen. In Phase fünf (V) (Figur 2d) sind beide Schaltkontakte V1 und V2 geschlossen. In Phase sechs (VI) wird der erste Schaltkontakt V1 geöffnet. In Phase sieben (VII) (Figur 2g) fährt der erste Wählerkontakt W1 die benachbarte zweite Wicklungsanzapfung n+1 an. In Phase acht (VIII) wird der der erste Schaltkontakt V1 geschlossen. In Phase neun (IX) ist der Umschaltvorgang beendet.This switching operation can thus be divided according to the invention into nine phases. In the first phase (I) ( FIG. 2a ) the switchover is initiated. In the second phase (II), the second switching contact V2 is opened. In the third phase (III) Figure 2c ), the adjacent second winding tap n + 1 is approached by the second selector contact W2. In phase four (IV), the second switching contact V2 is closed. In phase five (V) ( Figure 2d ) both switch contacts V1 and V2 are closed. In phase six (VI) will the first switching contact V1 opened. In phase seven (VII) ( Figure 2g ), the first selector contact W1 drives the adjacent second winding tap n + 1. In phase eight (VIII) of the first switching contact V1 is closed. In phase nine (IX), the switching process is completed.

In Figur 3 ist das erfindungsgemäße Verfahren durch einen schematischen Ablaufplan dargestellt. Dabei wird bei Initiierung des Umschaltvorgangs in der ersten Phase (I) durch die SUV 8 zunächst überprüft, ob an der für die Energieversorgung ausgewählten Phasenleitung I1, I2, I3 eine Spannung anliegt. Falls dies nicht der Fall ist, wird der Umschaltvorgang nicht durchgeführt und der Laststufenschalter 1 bleibt in dieser Position bzw. es wird der gesamte Stufentransformator 2 abgeschaltet. Falls eine Spannung anliegt, wird der Elektroantrieb 5 über die Steuerung 6 betätigt.In FIG. 3 the method according to the invention is represented by a schematic flow chart. In this case, upon initiation of the switching operation in the first phase (I), the SUV 8 first of all checks whether a voltage is applied to the phase line I1, I2, I3 selected for the energy supply. If this is not the case, the switching operation is not performed and the on-load tap-changer 1 remains in this position or the entire tapped transformer 2 is switched off. If a voltage is applied, the electric drive 5 is actuated via the controller 6.

Während dieser zweiten Phase (II) wird der zweite Schaltkontakt V2 geöffnet. Diese Phase ist als kritischer Schaltzustand anzusehen, da es bei einem nicht vollständig geöffneten zweiten Schaltkontakt V2 zum Nichtverlöschen des Lichtbogens kommen kann. Der Kontroller 7 überwacht während dieser Zeit die Energieversorgung des Elektroantriebs 5. Falls es während dieser Phase (II) zu einem Spannungseinbruch, also einem Ausfall der Energieversorgung kommt, wird dies von dem Korntroller 7 detektiert und mit Hilfe der in der Steuerung 6 vorhandenen Energie, aus dem bereits vorher aufgeladenen Kondensatoren, kompensiert, d.h. der zweite Schaltkontakt V2 wird vollständig geöffnet.During this second phase (II), the second switching contact V2 is opened. This phase is to be regarded as a critical switching state, since it can come to a not completely open second switching contact V2 for non-extinction of the arc. The controller 7 monitors during this time the power supply of the electric drive 5. If it comes during this phase (II) to a voltage dip, so a failure of the power supply, this is detected by the grain roller 7 and using the existing energy in the controller 6, from the previously charged capacitors, compensated, ie the second switching contact V2 is fully opened.

Wenn das Öffnen vollständig abgeschlossen ist, wird in der dritten Phase (III) die benachbarte Anzapfung n+1 durch den zweiten Wählerkontakt W2 angefahren. Während des Schließens des zweiten Schaltkontaktes V2, also in Phase vier (IV), wird die Energieversorgung über den Kontroller 7 überwacht. Diese Phase (IV) ist ebenfalls als kritischer Schaltzustand anzusehen, da es bei einem nicht vollständig geschlossenem zweiten Schaltkontakt V2 zu Vorzündungen und anschließendem Nichtverlöschen des Lichtbogens kommen kann. Bei einem Spannungseinbruch, also einem Ausfall der Energieversorgung, wird dies von dem Korntroller 7 detektiert und mit Hilfe der in der Steuerung 6 vorhandenen Energie, aus dem bereits vorher aufgeladenen Kondensatoren, kompensiert, d.h. der zweite Schaltkontakt V2 wird vollständig geschlossen. In der fünften Phase (V), also nach dem der zweite Schaltkontakt V2 geschlossen wurde, entsteht der sog. Kreisstrom Ik. Dieser Schaltzustand ist unkritisch.When the opening is completed, in the third phase (III), the adjacent tap n + 1 is approached by the second selector contact W2. During the closing of the second switching contact V2, ie in phase four (IV), the power supply is monitored by the controller 7. This phase (IV) is also to be regarded as a critical switching state, since it can lead to pre-ignition and subsequent non-extinction of the arc at a not completely closed second switching contact V2. In the event of a voltage dip, that is to say a failure of the power supply, this is detected by the grain roller 7 and compensated by means of the energy present in the controller 6, from the previously charged capacitors, i. the second switching contact V2 is completely closed. In the fifth phase (V), ie after the second switching contact V2 has been closed, the so-called circular current Ik arises. This switching state is not critical.

Vor dem Öffnen des ersten Schaltkontaktes V1, also Phase sechs (VI), wird erneut überprüft, ob an der für die Energieversorgung ausgewählten Phasenleitung I1, I2, I3 eine Spannung anliegt. Falls dies nicht der Fall ist, wird der Umschaltvorgang nicht durchgeführt und der Laststufenschalter verbleibt in dieser Position bzw. es wird der gesamte Stufentransformator abgeschaltet. In Phase sieben (VII) wird die benachbarte Anzapfung n+1 angefahren. In der achten Phase (VIII) wird der erste Schaltkontakt V1 geschlossen. Der Kontroller 7 überwacht während dieser Zeit die Energieversorgung des Elektroantriebs 5. Falls es während dieser Phase zu einem Spannungseinbruch, also einem Ausfall der Energieversorgung kommt, wird dies von dem Korntroller 7 detektiert und mit Hilfe der in der Steuerung 6 vorhandenen, bereits vorher aufgeladenen Kondensatoren kompensiert. In der letzten Phase ist der Umschaltvorgang abgeschlossen.Before the opening of the first switching contact V1, ie phase six (VI), it is checked again whether a voltage is applied to the phase line I1, I2, I3 selected for the energy supply is applied. If this is not the case, the switching process is not performed and the on-load tap-changer remains in this position or the entire tapped transformer is switched off. In phase seven (VII), the adjacent tap n + 1 is approached. In the eighth phase (VIII), the first switching contact V1 is closed. The controller 7 monitors during this time the power supply of the electric drive 5. If it comes during this phase to a voltage dip, ie a failure of the power supply, this is detected by the grain roller 7 and with the help of existing in the controller 6, already pre-charged capacitors compensated. In the last phase, the switching process is completed.

Mit Hilfe des erfindungsgemäßen Verfahrens wird stets sichergestellt, dass der erste und der zweite Schaltkontakt V1 und V2 nie einen kritischen Schaltzustand während eines Umschaltvorgangs eines Laststufenschalters 1, von einer Wicklungsanzapfung n zu einer nächsten Wicklungsanzapfung n+1, einnehmen. Damit wird verhindert, dass es zu einer Zerstörung der Schaltkontakte V1 und V2, des Laststufenschalters 1 oder gar des gesamten Stufentransformators 2 kommt. Dies hätte verheerende Auswirkungen auf ein Energieversorgungsnetz. Phasen der Umschaltung I - Initiierung einer Umschaltung - Überprüfung der Spannung einer ausgewählten Phasenleitung mittels SUV - Durchführung der Umschaltung bei anliegender Spannung - Abbruch der Umschaltung bei nicht anliegender Spannung II - Betätigung des Elektroantriebs mittels Steuerung - Öffnen des zweiten Schaltkontaktes - Überwachung der Spannung mittels Kontroller - Nutzung der Energie der Kondensatoren aus der Steuerung bei Spannungseinbruch für vollständiges Öffnen des zweiten Schalkontaktes III - Anfahren der benachbarten Wicklungsanzapfung durch den zweiten Wählerkontakt IV - Betätigung des Elektroantriebs mittels Steuerung - Schließen des zweiten Schaltkontaktes - Überwachung der Spannung mittels Kontroller - Nutzung der Energie der Kondensatoren aus der Steuerung bei Spannungseinbruch für vollständiges Schließen des zweiten Schalkontaktes V - Verharren bei vollständig geschlossenen Schaltkontakten - Entstehung des Kreisstromes - Überprüfung der Spannung einer ausgewählten Phasenleitung mittels SUV - Durchführung der Umschaltung bei anliegender Spannung - Abbruch der Umschaltung bei nicht anliegender Spannung VI - Betätigung des Elektroantriebs mittels Steuerung - Öffnen des ersten Schaltkontaktes - Überwachung der Spannung mittels Kontroller - Nutzung der Energie der Kondensatoren aus der Steuerung bei Spannungseinbruch für vollständiges Öffnen des zweiten Schalkontaktes VII - Anfahren der benachbarten Wicklungsanzapfung durch den ersten Wählerkontakt VIII - Betätigung des Elektroantriebs mittels Steuerung - Schließen des ersten Schaltkontaktes - Überwachung der Spannung mittels Kontroller - Nutzung der Energie der Kondensatoren aus der Steuerung bei Spannungseinbruch für vollständiges Schließen des ersten Schalkontaktes IX - Beendigung der Umschaltung With the aid of the method according to the invention, it is always ensured that the first and the second switching contact V1 and V2 never assume a critical switching state during a switching operation of an on-load tap-changer 1, from a winding tap n to a next winding tap n + 1. This prevents the destruction of the switching contacts V1 and V2, of the on-load tap-changer 1 or even of the entire tapped transformer 2. This would have devastating effects on a power grid. Phases of switching I - Initiation of a changeover - Checking the voltage of a selected phase line by means of SUV - Carrying out the changeover with applied voltage - Abort of the changeover when voltage is not present II - Actuation of the electric drive by means of control - Opening the second switching contact - Monitoring the voltage using a controller - Use of the energy of the capacitors from the controller at voltage dip for complete opening of the second Schalkontaktes III - Approaching the adjacent winding tap by the second selector contact IV - Actuation of the electric drive by means of control - Close the second switching contact - Monitoring the voltage using a controller - Use of the energy of the capacitors from the controller at voltage dip for complete closing of the second Schalkontaktes V - Stay with completely closed switching contacts - Origin of the circulating current - Checking the voltage of a selected phase line by means of SUV - Carrying out the changeover with applied voltage - Abort of the changeover when voltage is not present VI - Actuation of the electric drive by means of control - Opening the first switching contact - Monitoring the voltage using a controller - Using the energy of the capacitors from the controller at Voltage drop for complete opening of the second Schalkontaktes VII - Approaching the adjacent winding tap by the first selector contact VIII - Actuation of the electric drive by means of control - Close the first switching contact - Monitoring the voltage using a controller - Use of the energy of the capacitors from the controller at voltage dip for complete closing of the first Schalkontaktes IX - Termination of the changeover

Claims (10)

  1. Method of performing a switching-over process in an on-load tap changer (1), which is actuated by an electric drive (5) controlled by a control (6), between winding taps (n, n+1) of a tapped transformer (2) by means of switching contacts (V1, V2),
    wherein:
    - the switching-over process is divided into a plurality of phases (I - IX),
    - critical and non-critical switching states of the respectively used switching contacts (V1, V2) are identified,
    - each of these phases (I - IX) is monitored,
    - at the start of an intended switching-over process a value of the supply voltage as a decision basis is detected by means of a voltage monitoring device (8) in dependence on a decision logic parameterised in a controller (7) and switching over to the next defined phase (I - IX) of the switching-over process is carried out only if the supply voltage is present, and
    - in the case of a voltage drop in the mains or supply voltage and thus in the case of failure of the energy supply of the electric drive (5) during a switching-over process an identified critical switching state is overcome with the help of the residual energy present in the capacitors of the control (6) in that switching onwards to the succeeding switching state, which is identified as non-critical, is carried out.
  2. Method according to claim 1,
    characterised in that
    - after initiation of switching-over to the first phase (I) it is checked by a voltage monitoring device (8) whether a voltage is present at a selected phase line (I1, 12, 13),
    - the switching-over is broken off if a voltage is not present and
    - the switching-over is continued if voltage is present.
  3. Method according to claim 1,
    characterised in that
    - during the second phase (II) an electric drive (5) is actuated by way of a control (6) and in that case the second switching contact (V2) opened,
    - during the opening the energy supply of the electric drive (5) is monitored by a controller (7) and
    - in the case of a voltage drop at the energy supply of the electric drive (5) energy from capacitors of the control (6) is used for full opening of the second switching contact (V2).
  4. Method according to claim 1,
    characterised in that
    - during the third phase (III) an adjacent winding tap (n+1) is moved to by a second selector contact (W2).
  5. Method according to claim 1,
    characterised in that
    - during the fourth phase (IV) the electric drive (5) is actuated by way of a control (6) and in that case closes the second switching contact (V2),
    - the energy supply of the electric drive (5) is monitored by the controller (7) during the closing and
    - in the case of a voltage drop at the energy supply of the electric drive (5) energy from capacitors of the control (6) is used for full closing of the second switching contact (V2).
  6. Method according to claim 1,
    characterised in that
    - during the fifth phase (V) a first selector contact (W1) contacts a winding tap (n) and the second selector contact (W2) contacts the adjacent winding tap (n+1),
    - the first and second switching contacts (V1, V2) are closed and
    - in that case a circular current Ik arises.
  7. Method according to claim 1,
    characterised in that
    - during the sixth phase (VI) it is checked by the voltage monitoring device (8) before continuing the switching-over whether a voltage is present at a selected phase line (I1, I2, I3),
    - the switching-over is broken off if a voltage is not present and
    - the switching-over is continued if voltage is present.
  8. Method according to claim 1,
    characterised in that
    - during the seventh phase (VII) an adjacent winding tap (n+1) is moved to by the first selector contact (W1).
  9. Method according to claim 1,
    characterised in that
    - during the eighth phase (VIII) the electric drive (5) is actuated by way of a control (6) and in that case closes the first switching contact (V1),
    - the energy supply of the electric drive (5) is monitored by a controller (7) during the closing and
    - in the case of a voltage drop at the energy supply of the electric drive (5) energy from capacitors of the control (6) is used for full closing of the first switching contact (V1).
  10. Method according to claim 1,
    characterised in that
    - in the ninth phase (IX) the switching-over is concluded.
EP14716255.6A 2013-04-04 2014-03-21 Method for performing a switching process in an on-load tap changer Active EP2981979B1 (en)

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DE201310103360 DE102013103360A1 (en) 2013-04-04 2013-04-04 Method for performing a switching operation in an on-load tap-changer
PCT/EP2014/055733 WO2014161729A1 (en) 2013-04-04 2014-03-21 Method for performing a switching process in an on-load tap changer

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JP6438028B2 (en) * 2013-08-27 2018-12-12 マシイネンフアブリーク・ラインハウゼン・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Load tap changer, voltage control tapped transformer, and switching method with tapped transformer
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UA118102C2 (en) 2018-11-26
KR20150140308A (en) 2015-12-15
HK1214677A1 (en) 2016-07-29
BR112015024604A2 (en) 2017-07-18
CN105164770B (en) 2017-05-10
RU2015146988A (en) 2017-05-12
RU2015146988A3 (en) 2018-03-22
WO2014161729A1 (en) 2014-10-09
US20160018840A1 (en) 2016-01-21
US9513654B2 (en) 2016-12-06
KR102167439B1 (en) 2020-10-20
RU2658290C2 (en) 2018-06-20
CN105164770A (en) 2015-12-16
DE102013103360A1 (en) 2014-10-09
BR112015024604B1 (en) 2021-01-19
ES2647825T3 (en) 2017-12-26
JP2016519922A (en) 2016-07-07
JP6275244B2 (en) 2018-02-07
EP2981979A1 (en) 2016-02-10

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