EP2569781A2 - On-load tap changer - Google Patents

On-load tap changer

Info

Publication number
EP2569781A2
EP2569781A2 EP11706755A EP11706755A EP2569781A2 EP 2569781 A2 EP2569781 A2 EP 2569781A2 EP 11706755 A EP11706755 A EP 11706755A EP 11706755 A EP11706755 A EP 11706755A EP 2569781 A2 EP2569781 A2 EP 2569781A2
Authority
EP
European Patent Office
Prior art keywords
load
branch
winding
tap
vacuum interrupter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11706755A
Other languages
German (de)
French (fr)
Other versions
EP2569781B1 (en
Inventor
Wolfgang Albrecht
Christian Hammer
Christian Kotz
Sebastian Rehkopf
Andreas Sachsenhauser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Reinhausen GmbH
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
Original Assignee
Maschinenfabrik Reinhausen GmbH
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Maschinenfabrik Reinhausen GmbH, Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG filed Critical Maschinenfabrik Reinhausen GmbH
Publication of EP2569781A2 publication Critical patent/EP2569781A2/en
Application granted granted Critical
Publication of EP2569781B1 publication Critical patent/EP2569781B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/14—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices
    • 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
    • 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
    • H01H9/0038—Tap change devices making use of vacuum switches

Definitions

  • the invention relates to an on-load tap-changer for uninterrupted switching between winding taps of a tapped transformer according to the preamble of the first
  • an on-load tap changer which has a total of four vacuum interrupters per phase.
  • a vacuum interrupter as the main contact and a further vacuum interrupter, in series with a cross-over resistance, are provided as a resistance contact.
  • Tail transformers and the winding parts between the tapping stages is conditional on the one hand, lightning impulse voltages that result from the impact of lightning in the network.
  • Shocks are caused in the network to be controlled.
  • the object of the invention is an on-load tap-changer of the type mentioned above with high
  • the invention is based on the general idea, by additional mechanical switching elements, which are each arranged between the vacuum interrupters and the respective winding tap, with which they are electrically connected, a galvanic separation, d. H. Potential separation, the vacuum interrupters in each case not the load current leading branch of the respective
  • any occurring surge voltages are harmless for vacuum interrupters in each case not the load current leading load branch.
  • Figure 1 shows an on-load tap-changer according to the invention in a schematic representation.
  • Shown here is the basic position in which the winding tap n is connected.
  • FIGS. 2 to 13 show the individual steps of the switching sequence during a load switching to the winding tap n + 1.
  • FIG. 13 shows the stationary state after the load switching has been completed.
  • the diverter switch has, as also known from the prior art, two load branches A and B, which are in each case electrically connected to a winding tap n or n + 1.
  • the on-load tap changer according to the invention has a main current branch and a resistance current branch in each load branch.
  • the first main current branch establishes an electrical connection from the winding tapping n via a vacuum interrupter MSVa to the load derivation LA.
  • the second main current branch establishes an electrical connection from the winding tapping n + 1 via a vacuum interrupter MSVb to the load lead LA.
  • the first auxiliary current branch which is provided parallel to the first main current branch, establishes an electrical connection from the winding tap n via a further vacuum interrupter TTVa and a series-connected at least one first overvoltage resistance Ra for the purpose of dissipating the load.
  • the second auxiliary current branch which is provided parallel to the second main current branch, establishes an electrical connection from the winding tapping n + 1 via a further vacuum interrupter TTVb and a series-arranged at least one second overvoltage resistor Rb for discharging the load.
  • the respective mechanical contacts MDCa, TDCa, MDCb and TDCb are designed as double-pole changeover contacts (reversing contacts). However, they can also be realized as separate, easily interrupting contacts.
  • mechanical permanent main contacts MCa and MCb are provided in each load branch, one of which takes over the steady current operation in steady state operation and relieves the vacuum interrupter in the main branch of this load branch.
  • Winding tap led to load derivation LA It can be seen that the vacuum interrupter MSVb is completely separated from the non-connected winding tapping n + 1 by the mechanical contact MDCb arranged according to the invention in its position. Likewise, due to the position of the mechanical contact TDCb according to the invention, the vacuum interrupter TTVb is completely separated from the non-connected winding tapping n + 1.
  • the on-load tap-changer according to the invention thus makes it possible to completely isolate the vacuum interrupters in each branch not leading the load current from the respective winding tap and thus to protect it against surge voltage stresses.
  • FIG. 3 The vacuum interrupter MSVa opens; the vacuum interrupter MSVb also opens.
  • FIG. 5 The vacuum interrupter TTVb closes.
  • Overload resistors RA and RB in each of the two branches At the same time, the mechanical contact MDCa starts to open. The mechanical contact MDCb on the other side begins to close.
  • FIG. 7 Now opens the vacuum interrupter TTVa.
  • FIG. 9 The mechanical contact MDCa is fully open.
  • the mechanical contact MDCb is completely closed. At the same time close the vacuum interrupters MSVa and MSVb.
  • FIG. 10 The load current is now conducted by the vacuum interrupter MSVb. At the same time the mechanical contact TDCa opens.
  • FIG. 11 The vacuum interrupter TTVa closes.
  • Figure 12 Through the open mechanical contacts MDCa and TDCa are now the

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Protection Of Transformers (AREA)
  • Keying Circuit Devices (AREA)

Abstract

The invention relates to an on-load tap changer for step transformers, which has one main current branch and one auxiliary current branch for each of the two winding taps to be switched. In each main current branch and auxiliary current branch, switching is accomplished by means of a vacuum switching tube. According to the invention, an additional mechanical contact is provided in each of the main current branches and in each of the auxiliary current branches between the respective winding tap to which said branch is electrically connected and the respective vacuum switching tube in said branch. Said mechanical contacts are switched in such a way that the vacuum switching tubes in the main current branch and the auxiliary current branch of the unconnected winding tap can be galvanically isolated from the unconnected winding tap.

Description

Laststufenschalter  OLTC
Die Erfindung betrifft einen Laststufenschalter zur unterbrechungslosen Umschaltung zwischen Wicklungsanzapfungen eines Stufentransformators gemäß dem Oberbegriff des ersten The invention relates to an on-load tap-changer for uninterrupted switching between winding taps of a tapped transformer according to the preamble of the first
Patentanspruches. Claim.
Aus der DE 2021575 A ist ein Laststufenschalter bekannt, der insgesamt vier Vakuumschaltröhren pro Phase aufweist. In jedem der beiden Lastzweige, die jeweils mit einer Wicklungsanzapfung in Verbindung stehen, sind jeweils eine Vakuumschaltröhre als Hauptkontakt und jeweils eine weitere Vakuumschaltröhre, in Reihenschaltung mit einem Überschaltwiderstand, als Widerstandskontakt vorgesehen. From DE 2021575 A, an on-load tap changer is known, which has a total of four vacuum interrupters per phase. In each of the two load branches, which are each associated with a winding tap, in each case a vacuum interrupter as the main contact and a further vacuum interrupter, in series with a cross-over resistance, are provided as a resistance contact.
Bei einer unterbrechungslosen Lastumschaltung von der bisherigen Wicklungsanzapfung n auf die neue, vorgewählte Wicklungsanzapfung n+1 wird zunächst der Hauptkontakt der abschaltenden Seite geöffnet, darauf schließt der Widerstandskontakt der übernehmenden Seite, so dass zwischen den beiden Wicklungsanzapfungen n und n+1 ein durch die Überschaltwiderstände begrenzter  In an uninterrupted load switching from the previous winding tap n to the new, preselected winding tap n + 1, the main contact of the disconnecting side is first opened, then closes the resistor contact the receiving side, so that between the two winding taps n and n + 1 through the switching resistors limited
Ausgleichsstrom fließt. Equalizing current flows.
Nach dem der bisher geschlossene Widerstandskontakt der abschaltende Seite geöffnet hat, schließt dann der Hauptkontakt der übernehmenden Seite, so dass der gesamte Laststrom von der neuen Wicklungsanzapfung n+1 zur Lastableitung führt; die Umschaltung ist damit beendet.  After the previously closed resistance contact has opened the disconnecting side, then closes the main contact of the receiving side, so that the entire load current from the new winding tapping n + 1 leads to the load dissipation; the switch is over.
Bei verschiedenen Anwendungsfällen solcher bekannter Laststufenschalter mit Vakuumschaltröhren zur Regelung von Leistungstransformatoren ist jedoch eine hohe Stoßspannungsfestigkeit, bis zu 100 kV und deutlich darüber hinaus, erforderlich. In various applications of such known on-load tap-changer with vacuum interrupters for the control of power transformers, however, a high surge voltage resistance, up to 100 kV and significantly beyond, is required.
Solche unerwünschten Stoßspannungen, deren Höhe wesentlich durch den Aufbau des  Such unwanted surge voltages, the height of which is substantially due to the structure of the
Stufentransformators und der Wicklungsteile zwischen den einzelnen Anzapfstufen bedingt ist, sind zum einen Blitzstoßspannungen, die sich durch das Einschlagen von Blitzen im Netz ergeben. Tail transformers and the winding parts between the tapping stages is conditional on the one hand, lightning impulse voltages that result from the impact of lightning in the network.
Zum anderen können auch Schaltstoßspannungen auftreten, die durch nicht vorhersehbare On the other hand, switching impulse voltages can occur that are unpredictable
Schaltstöße im zu regelnden Netz verursacht sind. Shocks are caused in the network to be controlled.
Bei nicht ausreichender Stoßspannungsfestigkeit des Laststufenschalters kann es zu kurzzeitigem Stufenkurzschluss bzw. unerwünschtem Durchschlag an der Keramik bzw. dem Dampfschirm von Vakuumschaltröhren im nicht den Laststrom führenden Lastzweig kommen, was nicht nur deren Langzeitschädigung verursachen kann, sondern generell unerwünscht ist.  If there is insufficient surge voltage resistance of the on-load tap-changer, short-term step short circuit or undesirable breakdown of the ceramic or vapor shield of vacuum interrupters may occur in the load branch not carrying the load current, which can not only cause their long-term damage, but is generally undesirable.
Aus der DE 2357209 A und der DE 2604344 ist es bereits bekannt, zur Bekämpfung zu hoher Stoßspannungsbeanspruchungen zwischen den Lastzweigen Schutzfunkenstrecken oder spannungsabhängige Widerstände oder beides vorzusehen; diese Mittel sind jedoch in verschiedenen Fällen unzureichend und können schädliche Stoßspannungsbeanspruchungen in ihrer Wirkung nicht oder nicht vollständig ausschließen. From DE 2357209 A and DE 2604344 it is already known to provide protective spark gaps or voltage-dependent resistors or both to combat high surge voltage stresses between the load branches; However, these funds are in different Inadequate and can exclude harmful impulse stresses in their effect is not or not completely.
Aufgabe der Erfindung ist es, einen Laststufenschalter der eingangs genannten Art mit hoher The object of the invention is an on-load tap-changer of the type mentioned above with high
Stoßspannungsfestigkeit und zugleich hoher Schaltleistung anzugeben. To specify surge immunity and high switching capacity.
Diese Aufgabe wird durch einen Laststufenschalter mit den Merkmalen des ersten Patentanspruchs gelöst. Die Unteransprüche betreffen vorteilhafte Weiterbildungen der Erfindung. This object is achieved by an on-load tap changer having the features of the first claim. The subclaims relate to advantageous developments of the invention.
Der Erfindung liegt die allgemeine Idee zugrunde, durch zusätzliche mechanische Schaltelemente, die jeweils zwischen den Vakuumschaltröhren und der jeweiligen Wicklungsanzapfung, mit der sie elektrisch in Verbindung stehen, angeordnet sind, eine galvanische Trennung, d. h. Potentialtrennung, der Vakuumschaltröhren in jeweils nicht den Laststrom führenden Zweig von der jeweiligen The invention is based on the general idea, by additional mechanical switching elements, which are each arranged between the vacuum interrupters and the respective winding tap, with which they are electrically connected, a galvanic separation, d. H. Potential separation, the vacuum interrupters in each case not the load current leading branch of the respective
Wicklungsanzapfung zu erreichen. Achieve winding tap.
Dadurch werden eventuelle auftretende Stoßspannungen unschädlich für Vakuumschaltröhren im jeweils nicht den Laststrom führenden Lastzweig. Dies gilt gleichermaßen für die Vakuumschaltröhren, die als Hauptkontakt arbeiten, als auch diejenigen, die als Widerstandskontakt arbeiten.  As a result, any occurring surge voltages are harmless for vacuum interrupters in each case not the load current leading load branch. This applies equally to the vacuum interrupters that work as a main contact, as well as those that work as a resistor contact.
Die Erfindung soll nachfolgend an Hand von Zeichnungen beispielhaft noch näher erläutert werden. Die Figuren zeigen: The invention will be explained in more detail by way of example with reference to drawings. The figures show:
Figur 1 einen erfindungsgemäßen Laststufenschalter in schematischer Darstellung. Figure 1 shows an on-load tap-changer according to the invention in a schematic representation.
Gezeigt ist hier die Grundstellung, in der die Wicklungsanzapfung n beschaltet ist.  Shown here is the basic position in which the winding tap n is connected.
Figuren 2 bis 13 zeigen die einzelnen Schritte der Umschaltsequenz bei einer Lastumschaltung auf die Wicklungsanzapfung n+1. Figur 13 zeigt dabei den stationären Zustand nach vollzogener Lastumschaltung.  FIGS. 2 to 13 show the individual steps of the switching sequence during a load switching to the winding tap n + 1. FIG. 13 shows the stationary state after the load switching has been completed.
In Figur 1 ist der Lastumschalter eines erfindungsgemäßen Laststufenschalters im Detail dargestellt. Der Wähler des Laststufenschalters, der vor der eigentlichen Lastumschaltung die leistungslose Anwahl der neuen Wicklungsanzapfung, hier n+1 , auf die umgeschaltet werden soll, vornimmt, ist nicht dargestellt. In Figure 1, the diverter switch of a load tap changer according to the invention is shown in detail. The selector of the on-load tap-changer, which carries out the powerless selection of the new winding tapping, here n + 1, to which it is to be switched before the actual load changeover is not shown.
Der Lastumschalter hat, wie auch aus dem Stand der Technik bekannt, zwei Lastzweige A und B, die jeweils mit einer Wicklungsanzapfung n bzw. n+1 elektrisch in Verbindung stehen.  The diverter switch has, as also known from the prior art, two load branches A and B, which are in each case electrically connected to a winding tap n or n + 1.
Der erfindungsgemäße Laststufenschalter besitzt in jedem Lastzweig einen Hauptstromzweig und einen Widerstandsstromzweig. The on-load tap changer according to the invention has a main current branch and a resistance current branch in each load branch.
Der erste Hauptstromzweig stellt eine elektrische Verbindung von der Wicklungsanzapfung n über eine Vakuumschaltröhre MSVa zur Lastableitung LA her. Der zweite Hauptstromzweig stellt eine elektrische Verbindung von der Wicklungsanzapfung n+1 über eine Vakuumschaltröhre MSVb zur Lastableitung LA her. The first main current branch establishes an electrical connection from the winding tapping n via a vacuum interrupter MSVa to the load derivation LA. The second main current branch establishes an electrical connection from the winding tapping n + 1 via a vacuum interrupter MSVb to the load lead LA.
Der erste Hilfsstromzweig, der parallel zum ersten Hauptstromzweig vorgesehen ist, stellt eine elektrische Verbindung von der Wicklungsanzapfung n über eine weitere Vakuumschaltröhre TTVa und einen in Reihe dazu angeordneten mindestens einen ersten Überschaltwiderstand Ra zur Lastableitung her.  The first auxiliary current branch, which is provided parallel to the first main current branch, establishes an electrical connection from the winding tap n via a further vacuum interrupter TTVa and a series-connected at least one first overvoltage resistance Ra for the purpose of dissipating the load.
Der zweite Hilfsstromzweig, der parallel zum zweiten Hauptstromzweig vorgesehen ist, stellt eine elektrische Verbindung von der Wicklungsanzapfung n+1 über eine weitere Vakuumschaltröhre TTVb und einen in Reihe dazu angeordneten mindestens einen zweiten Überschaltwiderstand Rb zur Lastableitung her.  The second auxiliary current branch, which is provided parallel to the second main current branch, establishes an electrical connection from the winding tapping n + 1 via a further vacuum interrupter TTVb and a series-arranged at least one second overvoltage resistor Rb for discharging the load.
Erfindungsgemäß ist in jedem der Hauptstromzweige und in jedem der Hilfsstromzweige zwischen der jeweiligen Wicklungsanzapfung n bzw. n+1 und der damit elektrisch in Verbindung stehenden jeweiligen Vakuumschaltröhre MSVa, TTVa, bzw. auf der anderen Seite MSVb, TTVb ein weiterer, separat betätigbarer mechanischer Kontakt vorgesehen. Insgesamt sind also vier solcher  According to the invention, in each of the main flow branches and in each of the auxiliary flow branches between the respective winding tap n or n + 1 and the electrically related respective vacuum interrupter MSVa, TTVa, and on the other side MSVb, TTVb another, separately actuable mechanical contact intended. So in total there are four of them
mechanischer Kontakte vorhanden: mechanical contacts available:
Ein mechanischer Kontakt MDCa zum Schutz der Vakuumschaltröhre MSVa,  A mechanical contact MDCa for protecting the vacuum interrupter MSVa,
ein weiterer mechanischer Kontakt TDCa zum Schutz der Vakuumschaltröhre TTVa ein weiterer mechanischer Kontakt MDCb zum Schutz der Vakuumschaltröhre MSVb schließlich ein weiterer mechanischer Kontakt TDCb zum Schutz der Vakuumschaltröhre another mechanical contact TDCa to protect the vacuum interrupter TTVa another mechanical contact MDCb to protect the vacuum interrupter MSVb finally another mechanical contact TDCb to protect the vacuum interrupter
TTVb. TTVb.
In der Figur 1 sind die jeweiligen mechanischen Kontakte MDCa, TDCa, MDCb und TDCb als doppelpolige Umschaltkontakte (Wenderkontakte) ausgeführt. Sie sind jedoch ebenso als separate, einfach unterbrechende Kontakte realisierbar. In FIG. 1, the respective mechanical contacts MDCa, TDCa, MDCb and TDCb are designed as double-pole changeover contacts (reversing contacts). However, they can also be realized as separate, easily interrupting contacts.
Nach einer bevorzugten Ausführungsform der Erfindung sind, wie in Figur 1 ebenfalls dargestellt, in jedem Lastzweig noch mechanische Dauerhauptkontakte MCa und MCb vorgesehen, von denen einer jeweils im stationären Betrieb die Dauerstromführung übernimmt und die Vakuumschaltröhre im Hauptstromzweig dieses Lastzweiges entlastet. According to a preferred embodiment of the invention, as also shown in Figure 1, mechanical permanent main contacts MCa and MCb are provided in each load branch, one of which takes over the steady current operation in steady state operation and relieves the vacuum interrupter in the main branch of this load branch.
In der Figur 1 ist die Wicklungsanzapfung n beschaltet; der Laststrom wird von dieser In FIG. 1, the winding tap n is connected; the load current is from this
Wicklungsanzapfung zur Lastableitung LA geführt. Es ist zu sehen, dass durch den erfindungsgemäß angeordneten mechanischen Kontakt MDCb in dessen Stellung die Vakuumschaltröhre MSVb vollständig von der nicht beschalteten Wicklungsanzapfung n+1 getrennt ist. Ebenso ist durch die Stellung des erfindungsgemäßen mechanischen Kontaktes TDCb die Vakuumschaltröhre TTVb vollständig von der nicht beschalteten Wicklungsanzapfung n+1 getrennt. Der erfindungsgemäße Laststufenschalter ermöglicht es also, die Vakuumschaltröhren in jeweils nicht den Laststrom führenden Zweig vollständig von der jeweiligen Wicklungsanzapfung galvanisch zu trennen und damit vor Stoßspannungsbeanspruchungen zu schützen. Winding tap led to load derivation LA. It can be seen that the vacuum interrupter MSVb is completely separated from the non-connected winding tapping n + 1 by the mechanical contact MDCb arranged according to the invention in its position. Likewise, due to the position of the mechanical contact TDCb according to the invention, the vacuum interrupter TTVb is completely separated from the non-connected winding tapping n + 1. The on-load tap-changer according to the invention thus makes it possible to completely isolate the vacuum interrupters in each branch not leading the load current from the respective winding tap and thus to protect it against surge voltage stresses.
Nachfolgend soll an Hand der weiteren Figuren eine vollständige Schaltsequenz des Hereinafter, with reference to the other figures, a complete switching sequence of
erfindungsgemäßen Laststufenschalters bei der Umschaltung der in Figur 1 gezeigten Grundstellung auf die neue Wicklungsanzapfung n+1 in allen Einzelschritten dargestellt werden. According to the on-load tap changer according to the invention in the switching of the basic position shown in Figure 1 to the new winding tapping n + 1 are shown in all individual steps.
Figur 2: Der Dauerhauptkontakt MCA ist geöffnet; der Laststrom wird von der Vakuumschaltröhre Figure 2: The permanent main contact MCA is open; the load current is from the vacuum interrupter
MSVa übernommen. Gleichzeitig öffnet die Vakuumschaltröhre TTVb.  MSVa taken over. At the same time, the vacuum interrupter TTVb opens.
Figur 3: Die Vakuumschaltröhre MSVa öffnet; die Vakuumschaltröhre MSVb öffnet ebenfalls. Figure 3: The vacuum interrupter MSVa opens; the vacuum interrupter MSVb also opens.
Figur 4: Der Laststrom wird jetzt von der Vakuumschaltröhre TTVa und dem in Reihe geschalteten Figure 4: The load current is now from the vacuum interrupter TTVa and connected in series
Überschaltwiderstand RA geführt. Gleichzeitig schließt der bisher geöffnete mechanische Kontakt TDCb.  Overload resistance RA out. At the same time closes the previously open mechanical contact TDCb.
Figur 5: Die Vakuumschaltröhre TTVb schließt. FIG. 5: The vacuum interrupter TTVb closes.
Figur 6: Es fließt jetzt ein Kreisstrom über die beiden Vakuumschaltröhren TTVa und TTVb und Figure 6: It now flows a circular current through the two vacuum interrupters TTVa and TTVb and
Überschaltwiderstände RA und RB in jedem der beiden Zweige. Gleichzeitig beginnt der mechanische Kontakt MDCa zu öffnen. Der mechanische Kontakt MDCb auf der anderen Seite beginnt zu schließen.  Overload resistors RA and RB in each of the two branches. At the same time, the mechanical contact MDCa starts to open. The mechanical contact MDCb on the other side begins to close.
Figur 7: Jetzt öffnet die Vakuumschaltröhre TTVa. Figure 7: Now opens the vacuum interrupter TTVa.
Figur 8: Der Laststrom ist jetzt vollständig auf den anderen Zweig kommutiert und wird Figure 8: The load current is now fully commutated to the other branch and is
ausschließlich über die Reihenschaltung von TTVb und RB geführt.  exclusively via the series connection of TTVb and RB.
Figur 9: Der mechanische Kontakt MDCa ist vollständig geöffnet. Der mechanische Kontakt MDCb ist vollständig geschlossen. Gleichzeitig schließen die Vakuumschaltröhren MSVa und MSVb. Figure 9: The mechanical contact MDCa is fully open. The mechanical contact MDCb is completely closed. At the same time close the vacuum interrupters MSVa and MSVb.
Figur 10: Der Laststrom wird jetzt von der Vakuumschaltröhre MSVb geführt. Gleichzeitig öffnet der mechanische Kontakt TDCa. FIG. 10: The load current is now conducted by the vacuum interrupter MSVb. At the same time the mechanical contact TDCa opens.
Figur 11 : Die Vakuumschaltröhre TTVa schließt. Figur 12: Durch die geöffneten mechanischen Kontakte MDCa und TDCa sind jetzt dieFIG. 11: The vacuum interrupter TTVa closes. Figure 12: Through the open mechanical contacts MDCa and TDCa are now the
Vakuumschaltröhren auf der nicht den Laststrom führenden Seite MSVa bzw. TTVa vollständig galvanisch vom Potential der ehemals beschalteten Wicklungsanzapfung n getrennt. Vacuum switching tubes on the side not leading to the load current MSVa or TTVa completely galvanically separated from the potential of the formerly connected winding tapping n.
Figur 13: Schließlich übernimmt der Dauerhauptkontakt der neu beschalteten Seite MCB den Figure 13: Finally, the permanent main contact of the newly connected side MCB takes over
Laststrom; die Lastumschaltung auf die neue Wicklungsanzapfung n+1 ist abgeschlossen.  Load current; the load switching to the new winding tapping n + 1 is completed.
Es ist zu sehen, dass bei der erläuterten Schaltsequenz sichergestellt ist, dass jeweils die It can be seen that it is ensured in the illustrated switching sequence that the respective
Vakuumschaltröhren der nicht den Laststrom führenden Seite durch die entsprechenden Vacuum switching tubes of the non-load current leading side by the corresponding
mechanischen Kontakte von der nicht beschalteten Wicklungsanzapfung vollständig galvanisch getrennt sind - die Aufgabe der Erfindung ist gelöst. mechanical contacts are completely galvanically separated from the non-connected winding tap - the object of the invention is achieved.

Claims

Patentansprüche claims
1. Laststufenschalter zur unterbrechungslosen Umschaltung zwischen Wicklungsanzapfungen (n, n+1 ) eines Stufentransformators, umfassend einen Wähler zur leistungslosen Vorwahl der Wicklungsanzapfung (n, n+1 ), auf die umgeschaltet werden soll, und einen Lastumschalter zur eigentlichen Lastumschaltung von der bisherigen (n) auf die vorgewählte Wicklungsanzapfung (n+1 ), 1. on-load tap changer for uninterrupted switching between winding taps (n, n + 1) of a tapped transformer, comprising a selector for powerless selection of the winding tap (n, n + 1) to be switched to, and a diverter switch for actual load switching from the previous ( n) to the preselected winding tap (n + 1),
wobei der Lastumschalter zwei Hauptstromzweige und zwei Hilfsstromzweige besitzt,  wherein the diverter switch has two main branches and two auxiliary branches,
wobei der erste Hauptstromzweig die erste Wicklungsanzapfung (n) über eine Vakuumschaltröhre wherein the first main current branch is the first winding tap (n) via a vacuum interrupter
(MSVa) mit einer Lastableitung (LA) elektrisch verbindet, (MSVa) electrically connects to a load lead (LA),
wobei der zweite Hauptstromzweig die zweite Wicklungsanzapfung (n+1 ) über eine weitere Vakuumschaltröhre (MSVb) mit der Lastableitung (LA) elektrisch verbindet,  wherein the second main current branch electrically connects the second winding tapping (n + 1) to the load lead (LA) via another vacuum interrupter (MSVb),
wobei der erste Hilfsstromzweig die erste Wicklungsanzapfung (n) über eine Reihenschaltung aus einer weiteren Vakuumschaltröhre (TTVa) und mindestens einem Überschaltwiderstand (Ra) mit der Lastableitung (LA) verbindet  wherein the first auxiliary current branch connects the first winding tap (n) via a series circuit of a further vacuum interrupter (TTVa) and at least one transient resistance (Ra) to the load discharge (LA)
und wobei der zweite Hilfsstromzweig die zweite Wicklungsanzapfung (n+1 ) über eine  and wherein the second auxiliary branch current over the second winding tapping (n + 1) via a
Reihenschaltung aus einer weiteren Vakuumschaltröhre (TTVb) und mindestens einem weiteren Überschaltwiderstand (Rb) mit der Lastableitung (LA) verbindet,  Series connection of another vacuum interrupter (TTVb) and at least one further transient resistance (Rb) to the load dissipation (LA) connects,
dadurch gekennzeichnet,  characterized,
dass in jedem der beiden Hauptstromzweige und in jedem der beiden Hilfsstromzweige zwischen der jeweiligen Wicklungsanzapfung (n, n+1 ) und der jeweiligen Vakuumschaltröhre (MSVa, MSVb, TTVa, TTVb) in diesem Zweig ein weiterer, separat betätigbarer mechanischer Kontakt (MDCa, MDCb, TTCa, TTCb) vorgesehen ist, derart, dass die Vakuumschaltröhren (MSVa oder MSVb) im Hauptstromzweig und im Hilfsstromzweig (TTVa oder TTVb) der nicht beschalteten  in each of the two main current branches and in each of the two auxiliary current branches between the respective winding tap (n, n + 1) and the respective vacuum interrupter (MSVa, MSVb, TTVa, TTVb) in this branch another, separately actuable mechanical contact (MDCa, MDCb , TTCa, TTCb), such that the vacuum interrupters (MSVa or MSVb) in the main branch and in the auxiliary branch (TTVa or TTVb) of the unconnected
Wicklungsanzapfung (n oder n+1 ) galvanisch von dieser trennbar sind.  Winding tap (n or n + 1) are galvanically separated from this.
2. Laststufenschalter nach Anspruch 1 , 2. on-load tap changer according to claim 1,
dadurch gekennzeichnet,  characterized,
dass parallel zu jedem der beiden Hauptstromzweige ein Dauerhauptkontakt (MCa, MCb) zur Führung des Dauerstromes im stationären Betrieb vorgesehen ist.  a permanent main contact (MCa, MCb) is provided parallel to each of the two main current branches for the purpose of conducting the continuous current in stationary operation.
3. Laststufenschalter nach Anspruch 1 oder 2, 3. on-load tap-changer according to claim 1 or 2,
dadurch gekennzeichnet,  characterized,
dass die zusätzlichen mechanischen Kontakte (MDCa, MDCb, TTCa, TTCb) als doppelpolige Umschaltkontakte ausgebildet sind.  the additional mechanical contacts (MDCa, MDCb, TTCa, TTCb) are designed as double-pole changeover contacts.
4. Laststufenschalter nach Anspruch 1 oder 2 oder 3, 4. on-load tap changer according to claim 1 or 2 or 3,
dadurch gekennzeichnet, dass die zusätzlichen mechanischen Kontakte (MDCa, TDCa bzw. MDCb, TDCb) jeder Seite jeweils baulich vereinigt sind. characterized, that the additional mechanical contacts (MDCa, TDCa or MDCb, TDCb) of each side are structurally combined.
EP11706755.3A 2010-05-08 2011-02-23 On-load tap changer Active EP2569781B1 (en)

Applications Claiming Priority (2)

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DE102010019948.6A DE102010019948B4 (en) 2010-05-08 2010-05-08 OLTC
PCT/EP2011/000859 WO2011141081A2 (en) 2010-05-08 2011-02-23 On-load tap changer

Publications (2)

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EP2569781A2 true EP2569781A2 (en) 2013-03-20
EP2569781B1 EP2569781B1 (en) 2015-09-16

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US (1) US9373442B2 (en)
EP (1) EP2569781B1 (en)
JP (1) JP5823502B2 (en)
KR (1) KR101802262B1 (en)
CN (1) CN103026433B (en)
BR (1) BR112012027887B1 (en)
CA (1) CA2798959A1 (en)
DE (1) DE102010019948B4 (en)
HK (1) HK1178674A1 (en)
RU (1) RU2012152955A (en)
UA (1) UA109130C2 (en)
WO (1) WO2011141081A2 (en)

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Publication number Publication date
BR112012027887A8 (en) 2020-01-28
KR20130063505A (en) 2013-06-14
CN103026433B (en) 2016-06-22
BR112012027887B1 (en) 2020-03-10
JP5823502B2 (en) 2015-11-25
RU2012152955A (en) 2014-06-20
BR112012027887A2 (en) 2016-09-06
US9373442B2 (en) 2016-06-21
CN103026433A (en) 2013-04-03
WO2011141081A2 (en) 2011-11-17
JP2013530520A (en) 2013-07-25
CA2798959A1 (en) 2011-11-17
US20130057248A1 (en) 2013-03-07
WO2011141081A3 (en) 2013-02-07
EP2569781B1 (en) 2015-09-16
UA109130C2 (en) 2015-07-27
HK1178674A1 (en) 2013-09-13
DE102010019948A1 (en) 2011-11-10
KR101802262B1 (en) 2017-11-28
DE102010019948B4 (en) 2015-06-11

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