EP0252400A2 - Tap selector for tapped transformers equipped with a preliminary selector - Google Patents

Tap selector for tapped transformers equipped with a preliminary selector Download PDF

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Publication number
EP0252400A2
EP0252400A2 EP87109335A EP87109335A EP0252400A2 EP 0252400 A2 EP0252400 A2 EP 0252400A2 EP 87109335 A EP87109335 A EP 87109335A EP 87109335 A EP87109335 A EP 87109335A EP 0252400 A2 EP0252400 A2 EP 0252400A2
Authority
EP
European Patent Office
Prior art keywords
selector
wall
contacts
contact
preselector
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
EP87109335A
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German (de)
French (fr)
Other versions
EP0252400A3 (en
EP0252400B1 (en
Inventor
Dieter Dr.-Ing. Dohnal
Leo Pillmeier
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
Original Assignee
MASCHINENFABRIK REINHAUSEN Gebr SCHEUBECK & Co KG GmbH
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
Priority claimed from DE19863622716 external-priority patent/DE3622716A1/en
Priority claimed from DE19863644206 external-priority patent/DE3644206A1/en
Application filed by MASCHINENFABRIK REINHAUSEN Gebr SCHEUBECK & Co KG GmbH, Maschinenfabrik Reinhausen GmbH, Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG filed Critical MASCHINENFABRIK REINHAUSEN Gebr SCHEUBECK & Co KG GmbH
Priority to AT87109335T priority Critical patent/ATE72359T1/en
Publication of EP0252400A2 publication Critical patent/EP0252400A2/en
Publication of EP0252400A3 publication Critical patent/EP0252400A3/en
Application granted granted Critical
Publication of EP0252400B1 publication Critical patent/EP0252400B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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

Definitions

  • the invention relates to a multi-phase load selector for step transformers according to the preamble of claim 1.
  • Load selectors of this type are known: publication of the Maschinenfabrik Reinhausen "step switch type H" 0385/500 MR.
  • the preselector arranged on the side of the load selector is designed as an independent structural unit with its own head for a second flange provided in the step transformer.
  • the preselector is driven by a linkage arranged on the outer surface of the transformer, which is coupled to the drive of the load selector.
  • Load selectors are also known, in which the selection is provided as a direct component of the actual load selector in the upper or also in the lower part of the oil container (DE-PS 29 13 271, DE-OS 33 10 741).
  • the preselector is located in the oil of the load selector, which is subject to contamination, and this arrangement is therefore not so well suited for high voltages, especially since the isolation distances for the selector cannot be increased arbitrarily because of the spatial conditions provided for the load selector.
  • the division of the preselector into an upper and a lower part also leads to a very complex drive device.
  • the object of the invention is to provide a load selector with a preselector of the type mentioned, which is designed as a structural unit with only one tap changer head accommodating the drive device and is suitable for particularly high voltages. This object is achieved by the means specified in the characterizing part of patent claim 1.
  • the advantages achieved with the invention are in particular:
  • the selection is in the clean oil of the transformer.
  • the preselector contacts of a phase are approximately at the same level as the load selector contacts of the same phase, which means that the required connecting lines can be easily laid without crossing and which means that a favorable field distribution can be achieved from the start.
  • the drive of the preselector can be derived directly from the drive of the load selector.
  • the boom on the tap changer head is expediently designed to be hollow, the cavity of the boom communicating with the interior of the tap changer head.
  • An actuating lever for the selector shaft of the preselector can then be arranged in this cavity and can be actuated directly by the Maltese or the drive wheel of the load selector by means of a stop.
  • the drive for the selection is thus particularly simple.
  • the design as a tubular segment with a cylindrical shell as a wall enables the fixed contacts of the preselector to sit in the wall of the tubular segment and that polarization resistances can be arranged next to these contacts on the inside of the wall. It is also possible to provide an additional polarity switch in a particularly simple and space-saving manner, so that — which is desired in many cases — the auxiliary circuit for connecting the control winding only has to be closed during the actual turning process.
  • auxiliary circuit which serves to link the control winding to a certain potential, in particular when the control winding is switched over by means of the reverser.
  • the auxiliary circuit can also be permanently installed, so that when the load selector is installed in the step transformer, only the center tap of the control winding needs to be connected to the free connection contact of the series connection of the polarization resistors. This arrangement leads to a particularly compact design with minimal space requirements and nevertheless high dielectric strength.
  • the polarization resistances are on both sides of the insulating material wall of the pipe segment.
  • FIGS. 3 to 7 only the tubular segment of the turner is shown in sections for the sake of clarity.
  • the load selector consists of a cylindrical oil tank 1 with a tap changer head 2 and with an oil tank bottom 3.
  • the oil tank 1 consisting essentially of an insulating material cylinder, carries a series of fixed step contacts 4 for each phase, which are connected to the inside of the Oil contacts arranged movable contacts - not shown in detail - work together.
  • the movable contacts are moved by a switching tube 5 (FIG. 2), which is actuated via a drive wheel 6 arranged in the tap changer head 2.
  • the load selector can be placed with a collar 19 of the tap changer head 2 in the usual way on a corresponding flange of the transformer.
  • the selection 7 is designed as a tube segment, the switching shaft 10 being arranged in the center of the tube segment and being mounted in the arms 8 and 9.
  • the shell-shaped wall 11 of the pipe segment carries the fixed preselector contacts 12, which for each phase are approximately at the same height as the fixed step contacts 4 of the load selector.
  • the associated movable selector contacts 13 are carried and moved by the selector shaft 10 in the usual way.
  • special shielding electrodes 14 are provided between the phases and between phase and earth potential.
  • the arm 9 seated on the tap changer head 2 is provided with a cavity 15.
  • the selector shaft 10 of the preselector extends into this cavity 15 with its journal 16.
  • a lever 17 for actuating the selector shaft 10 is provided on the journal 16 within the cavity 15. This lever 17 is actuated by means of a stop 18, which sits on the drive wheel 6 of the load selector proper.
  • the wall 11 of the tube segment which is held by the brackets 8 of the cylindrical load selector (not shown here), carries fixed reversing contacts 121, 122, 123, of which 123 is the center contact of the reversing device.
  • a movable contact optionally establishes an electrical connection of the center contact 123 either with the fixed reversing contact 121 or with the reversing contact 122.
  • shielding electrodes 14 are provided, which are connected by potential connections 141, 142 to the reversing contacts 122 and 123, respectively.
  • a plurality of rod-shaped polarization resistors 20 are arranged in a zigzag arrangement in series, with one end 21 - provided that no polarity switch is provided is - by means of a electrical line 22 are connected to the center contact 123 of the turner and which are guided with their other end 23 and a further electrical line 24 to a further connection contact 25, which is seated in the wall 11.
  • the center tap of the control winding is connected to this connection contact 25 when the load selector is installed in the step transformer, so that the auxiliary circuit for the potential connection of the control winding is constantly closed.
  • this auxiliary circuit is not constantly closed because of the losses associated therewith, but is only closed during the actual turning operation, which requires an additional polarity switch.
  • Such an additional polarity switch is also provided in the area of the reversing contacts 121, 122, 123 on the inside 111 of the wall 11. Details of the polarity switch are shown in particular in FIGS. 6 and 7.
  • the polarity switch is instead of the electrical line 22 shown in dashed lines in FIG. 3. It has a contact arm 26 which is mounted on the inside 111 of the wall 11 and is held in its open position by a compression spring 27. It is electrically connected to the center contact 123 (FIGS. 3 and 4) of the turner.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Electrotherapy Devices (AREA)

Abstract

Multi-phase tap selector for tapped transformers with an oil-proof cylindrical housing (1) having a tap switching head (2) and an oil vessel base (3), which housing can be placed with an upper collar (19) of the tap switching head on a flange of the housing of the tapped transformer. A reverser (7) extending over the complete height of the tap selector is provided on the side of the tap selector, which reverser (7) is designed as a tube segment (7) seated in each case on one arm (8, 9) of the tap switching head and of the oil vessel base, in the centre of which tube segment there is located the switching shaft (10) of the reverser, which shaft is supported in the arms. The contacts (12, 13) of the reverser are located for each phase in approximately the same plane as the contacts (4) of the tap selector. As well as the contacts (12, 13) of the reverser, a plurality of rod- shaped poling resistors can be arranged on both sides of the wall, in a zig-zag line, which resistors are connected at their one end to the potential of the centre contact. <IMAGE>

Description

Die Erfindung bezieht sich auf einen mehrphasigen Lastwähler für Stufentransformatoren gemäß Oberbegriff des Anspruches 1. Derartige Lastwähler sind bekannt: Druckschrift der Maschinenfabrik Reinhausen "Stufenschalter Typ H" 0385/500 MR.The invention relates to a multi-phase load selector for step transformers according to the preamble of claim 1. Load selectors of this type are known: publication of the Maschinenfabrik Reinhausen "step switch type H" 0385/500 MR.

Bei diesen Lastwählern, die für hohe Spannungen Verwendung finden, wird der seitlich vom Lastwähler angeordnete Vorwähler als selbständige Baueinheit mit eigenem Kopf für einen im Stufentransformator vorgesehenen zweiten Flansch ausgeführt. Der Antrieb des Vorwählers erfolgt dabei mit einem an der Außenfläche des Transformators angeordneten Gestänge, das mit dem Antrieb des Lastwählers gekoppelt ist.In these load selectors, which are used for high voltages, the preselector arranged on the side of the load selector is designed as an independent structural unit with its own head for a second flange provided in the step transformer. The preselector is driven by a linkage arranged on the outer surface of the transformer, which is coupled to the drive of the load selector.

Bekannt sind ferner Lastwähler, bei denen der Vorwähler als unmittelbarer Bestandteil des eigentlichen Lastwählers im oberen oder auch im unteren Teil des Ölgefäßes vorgesehen ist (DE-PS 29 13 271, DE-OS 33 10 741). Hier befindet sich der Vorwähler jedoch im der Verschmutzung unterworfenen Öl des Lastwählers, und diese Anordnung ist deshalb für hohe Spannungen nicht so gut geeignet, zumal sich auch wegen der für den Lastwähler vorgesehenen räumlichen Verhältnisse die Isolationsabstände beim Vorwähler nicht beliebig vergrößern lassen. Die Aufteilung des Vorwählers in einen oberen und einen unteren Teil führt zudem zu einer sehr aufwendigen Antriebsvorrichtung.Load selectors are also known, in which the selection is provided as a direct component of the actual load selector in the upper or also in the lower part of the oil container (DE-PS 29 13 271, DE-OS 33 10 741). Here, however, the preselector is located in the oil of the load selector, which is subject to contamination, and this arrangement is therefore not so well suited for high voltages, especially since the isolation distances for the selector cannot be increased arbitrarily because of the spatial conditions provided for the load selector. The division of the preselector into an upper and a lower part also leads to a very complex drive device.

Aufgabe der Erfindung ist es, einen Lastwähler mit Vorwähler der eingangs genannten Art anzugeben, der als eine Baueinheit mit nur einem die Antriebsvorrichtung aufnehmenden Stufenschalterkopf ausgeführt, für besonders hohe Spannungen geeignet ist. Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Patentanspruches 1 angegebenen Mittel gelöst.The object of the invention is to provide a load selector with a preselector of the type mentioned, which is designed as a structural unit with only one tap changer head accommodating the drive device and is suitable for particularly high voltages. This object is achieved by the means specified in the characterizing part of patent claim 1.

Die mit der Erfindung erzielten Vorteile sind insbesondere:
Der Vorwähler befindet sich im sauberen Öl des Transformators. Die Vorwählerkontakte einer Phase liegen etwa auf gleicher Höhe wie die Lastwählerkontakte derselben Phase, wodurch die erforderlichen Verbindungsleitungen einfach zu verlegen sind, ohne daß sich diese kreuzen, und wodurch von vornherein eine günstige Feldverteilung erreichbar ist. Der Antrieb des Vorwählers läßt sich direkt vom Antrieb des Lastwählers ableiten.The advantages achieved with the invention are in particular:
The selection is in the clean oil of the transformer. The preselector contacts of a phase are approximately at the same level as the load selector contacts of the same phase, which means that the required connecting lines can be easily laid without crossing and which means that a favorable field distribution can be achieved from the start. The drive of the preselector can be derived directly from the drive of the load selector.

In zweckmäßiger Weise wird der am Stufenschalterkopf sitzende Ausleger hohl ausgebildet, wobei der Hohlraum des Auslegers mit dem Innern des Stufenschalterkopfes in Verbindung steht. In diesem Hohlraum kann dann ein Betätigungshebel für die Schaltwelle des Vorwählers angeordnet werden, der direkt vom Malteser- oder vom Antriebsrad des Lastwählers mittels Anschlag betätigt werden kann. Der Antrieb für den Vorwähler gestaltet sich so auf besonders einfache Weise.The boom on the tap changer head is expediently designed to be hollow, the cavity of the boom communicating with the interior of the tap changer head. An actuating lever for the selector shaft of the preselector can then be arranged in this cavity and can be actuated directly by the Maltese or the drive wheel of the load selector by means of a stop. The drive for the selection is thus particularly simple.

Die Ausführung als Rohrsegment mit einer Zylinderschale als Wand ermöglicht, daß die feststehenden Kontakte des Vorwählers in der Wand des Rohrsegments sitzen können und daß neben diesen Kontakten an der Innenseite der Wand Polungswiderstände angeordnet werden können. Auch läßt sich auf besonders einfache und raumsparende Weise ein zusätzlicher Polungsschalter vorsehen, damit - was in vielen Fällen gewünscht wird - der Hilfsstromkreis zum Anlenken der Regelwicklung nur während des eigentlichen Wendevorganges geschlossen zu werden braucht.The design as a tubular segment with a cylindrical shell as a wall enables the fixed contacts of the preselector to sit in the wall of the tubular segment and that polarization resistances can be arranged next to these contacts on the inside of the wall. It is also possible to provide an additional polarity switch in a particularly simple and space-saving manner, so that — which is desired in many cases — the auxiliary circuit for connecting the control winding only has to be closed during the actual turning process.

Es steht somit ein Hilfsstromkreis zur Verfügung, der dem Anlenken der Regelwicklung an ein bestimmtes Potential dient, insbesondere dann, wenn die Regelwicklung mittels des Wenders umgeschaltet wird. Hierbei kann der Hilfsstromkreis auch fest installiert sein, so daß beim Einbau des Lastwählers in den Stufentransformator lediglich die Mittenanzapfung der Regelwicklung an den freien Anschlußkontakt der Reihenschaltung der Polungswiderstände angeschlossen zu werden braucht. Diese Anordnung führt zu einer besonders kompakten Ausführung mit minimalen Raumbedarf und trotzdem hoher Spannungsfestigkeit.An auxiliary circuit is thus available which serves to link the control winding to a certain potential, in particular when the control winding is switched over by means of the reverser. Here, the auxiliary circuit can also be permanently installed, so that when the load selector is installed in the step transformer, only the center tap of the control winding needs to be connected to the free connection contact of the series connection of the polarization resistors. This arrangement leads to a particularly compact design with minimal space requirements and nevertheless high dielectric strength.

Hierbei ist es besonders günstig, wenn die Polungswiderstände zu beiden Seiten der Isolierstoffwand des Rohrsegmentes liegen.It is particularly advantageous here if the polarization resistances are on both sides of the insulating material wall of the pipe segment.

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher beschrieben. Es zeigen

  • Fig. 1 eine Seitenansicht des Lastwählers mit Vorwähler und
  • Fig. 2 die Ausführung des Stufenschalterkopfes im Schnitt eines ersten Ausführungsbeispieles, sowie
  • Fig. 3 eine Vorderansicht,
  • Fig. 4 einen Längsschnitt,
  • Fig. 5 eine Draufsicht des zweiten Ausführungsbeispieles und
  • Fig. 6 und 7 einen Polungsschalter im Detail.
Two embodiments of the invention are shown in the drawing and are described in more detail below. Show it
  • Fig. 1 is a side view of the load selector with selection and
  • Fig. 2 shows the execution of the tap changer head in section of a first embodiment, and
  • 3 is a front view,
  • 4 shows a longitudinal section,
  • Fig. 5 is a plan view of the second embodiment and
  • 6 and 7 a polarity switch in detail.

In Fig. 3 bis 7 ist hierbei der Übersichtlichkeit wegen lediglich das Rohrsegment des Wenders ausschnittsweise dargestellt.In FIGS. 3 to 7, only the tubular segment of the turner is shown in sections for the sake of clarity.

Wie insbesondere aus Figur 1 ersichtlich, besteht der Lastwähler aus einem zylindrischen Ölgefäß 1 mit einem Stufenschalterkopf 2 und mit einem Ölgefäßboden 3. Das im wesentlichen aus einem Isolierstoffzylinder bestehende Ölgefäß 1 trägt für jede Phase eine Reihe von feststehenden Stufenkontakten 4, die mit im Innern des Ölgefäßes angeordneten beweglichen Kontakten - ­im einzelnen nicht dargestellt - zusammenarbeiten. Die beweglichen Kontakte werden dabei von einem Schaltrohr 5 bewegt (Fig. 2), welches über ein im Stufenschalterkopf 2 angeordnetes Antriebsrad 6 betätigt wird. Der Lastwähler ist mit einem Kragen 19 des Stufenschalterkopfes 2 auf übliche Weise auf einen entsprechenden Flansch des Transformators aufsetzbar. Seitlich vom eigentlichen Lastwähler, also seitlich vom zylindrischen Ölgefäß 1, befindet sich der sich über die gesamte Höhe des Lastwählers erstreckende Vorwähler 7. Er wird von einem am Ölgefäßboden 3 sitzenden Ausleger 8 sowie von einem am Stufenschalterkopf 2 sitzenden Ausleger 9 getragen. Der Vorwähler 7 ist als Rohrsegment ausgebildet, wobei im Zentrum des Rohrsegments die Schaltwelle 10 angeordnet ist, die in den Auslegern 8 und 9 gelagert ist. Die schalenförmig ausgebildete Wand 11 des Rohrsegments trägt die feststehenden Vorwählerkontakte 12, die sich für jede Phase jeweils etwa auf gleicher Höhe befinden wie die feststehenden Stufenkontakte 4 des Lastwählers. Die zugehörigen beweglichen Vorwählerkontakte 13 werden von der Schaltwelle 10 auf übliche Weise getragen und bewegt. Zur Erhöhung der Spannungsfestigkeit sind zwischen den Phasen und zwischen Phase und Erdpotential besondere Abschirmelektroden 14 vorgesehen.As can be seen in particular from Figure 1, the load selector consists of a cylindrical oil tank 1 with a tap changer head 2 and with an oil tank bottom 3. The oil tank 1, consisting essentially of an insulating material cylinder, carries a series of fixed step contacts 4 for each phase, which are connected to the inside of the Oil contacts arranged movable contacts - not shown in detail - work together. The movable contacts are moved by a switching tube 5 (FIG. 2), which is actuated via a drive wheel 6 arranged in the tap changer head 2. The load selector can be placed with a collar 19 of the tap changer head 2 in the usual way on a corresponding flange of the transformer. The preselector 7, which extends over the entire height of the load selector, is located to the side of the actual load selector, that is to say to the side of the cylindrical oil container 1. It is supported by a bracket 8 seated on the oil container bottom 3 and by a bracket 9 located on the tap changer head 2. The selection 7 is designed as a tube segment, the switching shaft 10 being arranged in the center of the tube segment and being mounted in the arms 8 and 9. The shell-shaped wall 11 of the pipe segment carries the fixed preselector contacts 12, which for each phase are approximately at the same height as the fixed step contacts 4 of the load selector. The associated movable selector contacts 13 are carried and moved by the selector shaft 10 in the usual way. To increase the dielectric strength, special shielding electrodes 14 are provided between the phases and between phase and earth potential.

Wie insbesondere aus Figur 2 hervorgeht, ist der am Stufenschalterkopf 2 sitzende Ausleger 9 mit einem Hohlraum 15 versehen. Die Schaltwelle 10 des Vorwählers reicht mit ihrem Lagerzapfen 16 in diesen Hohlraum 15 hinein. Innerhalb des Hohlraumes 15 ist am Lagerzapfen 16 ein Hebel 17 zur Betätigung der Schaltwelle 10 vorgesehen. Dieser Hebel 17 wird mittels Anschlag 18, der am Antriebsrad 6 des eigentlichen Lastwählers sitzt, betätigt.As can be seen in particular from FIG. 2, the arm 9 seated on the tap changer head 2 is provided with a cavity 15. The selector shaft 10 of the preselector extends into this cavity 15 with its journal 16. A lever 17 for actuating the selector shaft 10 is provided on the journal 16 within the cavity 15. This lever 17 is actuated by means of a stop 18, which sits on the drive wheel 6 of the load selector proper.

Wie insbesondere aus den Figuren 3 und 4 des zweiten Ausführungsbeispiels ersichtlich, trägt die Wand 11 des Rohrsegments, die von den Auslegern 8 des hier nicht dargestellten zylindrischen Lastwählers gehalten wird, feststehende Wenderkontakte 121, 122, 123, wovon 123 der Mittelkontakt des Wenders ist. Ein beweglicher - hier nicht dargestellter - Kontakt stellt wahlweise eine elektrische Verbindung des Mittelkontakts 123 entweder mit dem festen Wenderkontakt 121 oder mit dem Wenderkontakt 122 her. Zur Erhöhung der Spannungsfestigkeit zwischen den Phasen I, II sind Abschirmelektroden 14 vorgesehen, die durch Potentialverbindungen 141, 142 mit den Wenderkontakten 122 bzw. 123 verbunden sind.As can be seen in particular from FIGS. 3 and 4 of the second exemplary embodiment, the wall 11 of the tube segment, which is held by the brackets 8 of the cylindrical load selector (not shown here), carries fixed reversing contacts 121, 122, 123, of which 123 is the center contact of the reversing device. A movable contact (not shown here) optionally establishes an electrical connection of the center contact 123 either with the fixed reversing contact 121 or with the reversing contact 122. To increase the dielectric strength between phases I, II, shielding electrodes 14 are provided, which are connected by potential connections 141, 142 to the reversing contacts 122 and 123, respectively.

Wie Figur 3 zeigt, sind neben den Wenderkontakten 121, 122 und 123, und zwar zu beiden Seiten 111, 112 der Wand 11, in einer Reihenschaltung in zickzackförmiger Anordnung mehrere stabförmige Polungswiderstände 20 angeordnet, die mit ihrem einen Ende 21 - ­soweit kein Polungsschalter vorgesehen ist - mittels einer elektrischen Leitung 22 an den Mittelkontakt 123 des Wenders angeschlossen sind und die mit ihrem anderen Ende 23 und einer weiteren elektrischen Leitung 24 an einen weiteren Anschlußkontakt 25, der in der Wand 11 sitzt, geführt sind. An diesen Anschlußkontakt 25 wird beim Einbau des Lastwählers in den Stufentransformator die Mittenanzapfung der Regelwicklung angeschlossen, so daß der Hilfsstromkreis für die Potentialverbindung der Regelwicklung ständig geschlossen ist. Die Anordnung der stabförmigen Polungswiderstände 20 zu beiden Seiten 111, 112 der Wand 11, wobei immer abwechselnd ein Widerstand an der Außenseite 112 und der nächste an der Innenseite 111 der Wand 11 zu liegen kommt, führt zu einer besonders guten Raumausnutzung und hoher Spannungsfestigkeit.As shown in FIG. 3, in addition to the reversing contacts 121, 122 and 123, on both sides 111, 112 of the wall 11, a plurality of rod-shaped polarization resistors 20 are arranged in a zigzag arrangement in series, with one end 21 - provided that no polarity switch is provided is - by means of a electrical line 22 are connected to the center contact 123 of the turner and which are guided with their other end 23 and a further electrical line 24 to a further connection contact 25, which is seated in the wall 11. The center tap of the control winding is connected to this connection contact 25 when the load selector is installed in the step transformer, so that the auxiliary circuit for the potential connection of the control winding is constantly closed. The arrangement of the rod-shaped polarization resistors 20 on both sides 111, 112 of the wall 11, with one resistor alternatingly lying on the outside 112 and the next on the inside 111 of the wall 11, leads to a particularly good use of space and a high dielectric strength.

In vielen Fällen wird nun gewünscht, daß dieser Hilfsstromkreis wegen der damit verbunden Verluste nicht ständig geschlossen ist, sondern lediglich während des eigentlichen Wendevorganges geschlossen wird, was einen zusätzlichen Polungsschalter erfordert. Ein derartiger zusätzlicher Polungsschalter ist ebenfalls im Bereich der Wenderkontakte 121, 122, 123 an der Innenseite 111 der Wand 11 vorgesehen. Einzelheiten des Polungsschalters gehen insbesondere aus den Figuren 6 und 7 hervor. Der Polungsschalter liegt dabei anstelle der in Figur 3 gestrichelt gezeichneten elektrischen Leitung 22. Er besitzt einen Kontaktarm 26, der an der Innenseite 111 der Wand 11 gelagert ist und durch eine Druckfeder 27 in seiner geöffneten Stellung gehalten wird. Er ist elektrisch mit dem Mittelkontakt 123 (Fig.3 und 4) des Wenders verbunden. Mittels einer an der Schaltwelle 10 des Wenders sitzenden Kulisse 28 wird der Kontaktarm 26 zu Beginn der Wenderbetätigung gegen den feststehenden Kontakt 29 gedrückt, an dem das eine Ende 21 der Reihenschaltung der Polungswiderstände 20 angeschlossen ist. Hierzu läuft die Kulisse 28 mit ihrer Flanke 30 gegen eine am Kontaktarm 26 sitzende Rolle 31. Die Rolle 31 wird dann am Ende des Wendevorganges durch eine zweite Flanke 32 der Kulisse 28 wieder freigegeben. Es ist ohne weiteres klar, daß der Hilfsstromkreis zum Anlenken der Regelwicklung nur kurzzeitig geschlossen wird, und zwar in der Reihenfolge: Polungsschalter schließt - Wender öffnet - Wender schließt - ­Polungsschalter öffnet.In many cases it is now desired that this auxiliary circuit is not constantly closed because of the losses associated therewith, but is only closed during the actual turning operation, which requires an additional polarity switch. Such an additional polarity switch is also provided in the area of the reversing contacts 121, 122, 123 on the inside 111 of the wall 11. Details of the polarity switch are shown in particular in FIGS. 6 and 7. The polarity switch is instead of the electrical line 22 shown in dashed lines in FIG. 3. It has a contact arm 26 which is mounted on the inside 111 of the wall 11 and is held in its open position by a compression spring 27. It is electrically connected to the center contact 123 (FIGS. 3 and 4) of the turner. By means of a link 28 seated on the control shaft 10 of the turner, the contact arm 26 is pressed against the fixed contact 29 at the beginning of the turning operation, to which the one end 21 of the series connection of the polarization resistors 20 is connected. For this purpose, the link 28 runs with its flank 30 against a roller 31 seated on the contact arm 26. The roller 31 is then released again at the end of the turning process by a second flank 32 of the link 28. It is readily apparent that the auxiliary circuit for articulating the control winding only is closed briefly, in the following order: polarity switch closes - turner opens - turner closes - polarity switch opens.

Claims (5)

1. Mehrphasiger Lastwähler für Stufentransformatoren mit einem einen Stufenschalterkopf und einen Ölgefäßboden besitzenden öldichten zylindrischen Gehäuse, welches mit einem oberen Kragen des Stufenschalterkopfes auf einen Flansch des Gehäuses des Stufentransformators aufsetzbar ist und mit einem seitlich vom Lastwähler angeordneten Vorwähler, dessen bewegliche Kontakte von einer Schaltwelle getragen werden,
dadurch gekennzeichnet,
daß der sich über die gesamte Höhe des Lastwählers (1) erstreckende Vorwähler (7) als ein an je einem Ausleger (8, 9) des Stufenschalterkopfes (2) und des Ölgefäßbodens (3) sitzendes Rohrsegment ausgebildet ist, in dessen Zentrum sich die in den Auslegern (8, 9) gelagerte Schaltwelle (10) des Vorwählers befindet, wobei für jede Phase die Kontakte (12, 13) des Vorwählers etwa in derselben Ebene liegen wie die Kontakte (4) des Lastwählers.1.Multi-phase load selector for step transformers with an oil-tight cylindrical housing, which has a step switch head and an oil vessel bottom, which can be placed with an upper collar of the step switch head on a flange of the housing of the step transformer and with a selector arranged to the side of the load selector, the movable contacts of which are carried by a switching shaft will,
characterized by
that the over the entire height of the load selector (1) extending preselector (7) is designed as a tube segment sitting on a bracket (8, 9) of the tap changer head (2) and the oil vessel bottom (3), in the center of which the the booms (8, 9) mounted shift shaft (10) of the preselector, the contacts (12, 13) of the preselector being approximately in the same plane as the contacts (4) of the load selector for each phase. 2. Mehrphasige Lastwähler nach Anspruch 1, dadurch gekennzeichnet, daß der am Stufenschalterkopf (2) sitzende Ausleger (9) ein mit dem Innern des Kopfes in Verbindung stehenden Hohlraum (15) aufweist, wobei die Schaltwelle (10) des Vorwählers (7) mit ihrem oberen Lagerzapfen (16) in diesen Hohlraum hineinragt und im Hohlraum ein mit dem Lagerzapfen (16) der Schaltwelle verbundener Betätigungshebel (17) angeordnet ist.2. Multi-phase load selector according to claim 1, characterized in that the bracket (9) seated on the tap changer head (9) has a cavity (15) communicating with the inside of the head, the selector shaft (10) of the preselector (7) having its upper bearing pin (16) protrudes into this cavity and an actuating lever (17) connected to the bearing pin (16) of the selector shaft is arranged in the cavity. 3. Mehrphasiger Lastwähler nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß die feststehenden Kontakte (12) des Vorwählers (7) in der Wand (11) des Rohrsegmentes sitzen und daß neben diesen Kontakten an der Innenseite der Wand Polungswiderstände (20) angeordnet sind.3. Multi-phase load selector according to claim 1 or 2,
characterized in that the fixed contacts (12) of the preselector (7) are seated in the wall (11) of the pipe segment and that polarity resistors (20) are arranged next to these contacts on the inside of the wall. 4. Mehrsphasiger Lastwähler nach Anspruch 3, dadurch gekennzeichnet, daß mehrere stabförmige zu beiden Seiten (111, 112) der Wand (11) des Rohrsegments in Zickzacklinie durch die Wand hindurch in einer Reihenschaltung verbundene Polungswiderstände (20) vorhanden sind, wobei die Reihenschaltung mit ihrem einen Ende (21) an den Mittelkontakt (123) des Wenders und mit ihrem anderen Ende (23) an einen zusätzlichen in der Wand (11) des Rohrsegments sitzenden Anschlußkontakt (25) geführt ist.4. Multi-phase load selector according to claim 3, characterized in that several rod-shaped On both sides (111, 112) of the wall (11) of the pipe segment in zigzag line through the wall in a series connection connected polar resistors (20) are present, the series connection having one end (21) to the center contact (123) of the turner and with its other end (23) to an additional in the wall (11) of the pipe segment seated contact (25) is guided. 5. Mehrphasiger Lastwähler nach Anspruch 3 oder 4,
dadurch gekennzeichnet, daß für jede Phase im Rohrsegment neben den Polungswiderständen ein Polungsschalter angeordnet ist und daß der Polungsschalter einen an der Innenseite (111) der Wand (11) des Rohrsegmentes gelagerten mit dem Potential des Mittelkontakts (123) des Wenders verbundenen Kontakthebel (26) besitzt, der mittels einer an der Schaltwelle (10) des Wenders sitzenden Kulisse (28) gegen den zugehörigen in der Wand (11) sitzenden feststehenden Polungskontakt (29) schwenkbar ist, wobei das eine Ende der Reihenschaltung der Polungswiderstände (20) an den als Anschlußkontakt (291) ausgebildeten feststehenden Polungskontakt (29) geführt ist.5. Multi-phase load selector according to claim 3 or 4,
characterized in that a polarity switch is arranged next to the polarization resistors for each phase in the tube segment and in that the polarity switch has a contact lever (26) mounted on the inside (111) of the wall (11) of the tube segment and connected to the potential of the center contact (123) of the reverser has which can be pivoted by means of a link (28) seated on the selector shaft (10) of the turner against the associated fixed polarity contact (29) seated in the wall (11), one end of the series connection of the polarization resistors (20) being connected to the Terminal contact (291) trained fixed polarity contact (29) is guided.
EP87109335A 1986-07-05 1987-06-29 Tap selector for tapped transformers equipped with a preliminary selector Expired - Lifetime EP0252400B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87109335T ATE72359T1 (en) 1986-07-05 1987-06-29 LOAD SELECTOR WITH PRESELECTOR FOR TAP TRANSFORMERS.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3622716 1986-07-05
DE19863622716 DE3622716A1 (en) 1986-07-05 1986-07-05 Load selector, provided with a preselector, for tapped transformers
DE3644206 1986-12-23
DE19863644206 DE3644206A1 (en) 1986-12-23 1986-12-23 Load selector equipped with preselector for tap-changing transformers

Publications (3)

Publication Number Publication Date
EP0252400A2 true EP0252400A2 (en) 1988-01-13
EP0252400A3 EP0252400A3 (en) 1989-11-02
EP0252400B1 EP0252400B1 (en) 1992-01-29

Family

ID=25845329

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87109335A Expired - Lifetime EP0252400B1 (en) 1986-07-05 1987-06-29 Tap selector for tapped transformers equipped with a preliminary selector

Country Status (7)

Country Link
EP (1) EP0252400B1 (en)
JP (1) JP2609248B2 (en)
KR (1) KR960013034B1 (en)
CN (1) CN1013718B (en)
AT (1) ATE72359T1 (en)
DE (1) DE3776434D1 (en)
IN (1) IN169357B (en)

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WO2000010182A1 (en) * 1998-08-12 2000-02-24 Maschinenfabrik Reinhausen Gmbh Step switch with selector
CN102623155A (en) * 2011-01-30 2012-08-01 上海华明电力设备制造有限公司 Integrated plug-pull combined type vacuum on-load tap changer
CN103415904A (en) * 2011-03-18 2013-11-27 赖茵豪森机械制造公司 Load stepping switch
WO2017144241A1 (en) * 2016-02-26 2017-08-31 Siemens Aktiengesellschaft Arrangement for electrostatically shielding an electric system

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DE10312176B3 (en) * 2003-03-19 2004-06-09 Maschinenfabrik Reinhausen Gmbh Load switch for stepping switch with 2 fixed main contact pairs for each current phase to be switched and cooperating movable main contact
US8153916B2 (en) * 2008-08-14 2012-04-10 Cooper Technologies Company Tap changer switch
DE102011008702B4 (en) * 2011-01-15 2015-01-08 Maschinenfabrik Reinhausen Gmbh Tap changer with a selection
CN102709106B (en) * 2012-05-17 2015-03-11 上海华明电力设备集团有限公司 Vacuum arc extinction change-over selector
DE102013107549B4 (en) * 2013-07-16 2017-11-30 Maschinenfabrik Reinhausen Gmbh Load selector for step transformers and carrier arm for a selection of load selector
DE102013019595B4 (en) * 2013-11-25 2016-02-25 Maschinenfabrik Reinhausen Gmbh Carrier module and support frame for polarity resistors of a tap changer, fixing element for polarity resistors and arrangement of polarity resistors of a tap changer

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FR1172555A (en) * 1956-01-07 1959-02-12 On-load switching manipulator for tap-type transformers
US3174097A (en) * 1962-02-08 1965-03-16 Reinhausen Maschf Scheubeck Transfer switch for tap changers for regulating transformers
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EP0120379A1 (en) * 1983-03-24 1984-10-03 Siemens Aktiengesellschaft Load changer for switching step windings of a three-phase transformer

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FR1172555A (en) * 1956-01-07 1959-02-12 On-load switching manipulator for tap-type transformers
US3174097A (en) * 1962-02-08 1965-03-16 Reinhausen Maschf Scheubeck Transfer switch for tap changers for regulating transformers
US3783206A (en) * 1972-07-06 1974-01-01 Westinghouse Electric Corp Tap changing apparatus with improved contact structure to eliminate electrical fields across open interrupter switches
FR2453481A1 (en) * 1979-04-03 1980-10-31 Reinhausen Kg Maschf LOADED THREE-PHASE SELECTOR FOR STEP-BY-STEP TRANSFORMERS
EP0120379A1 (en) * 1983-03-24 1984-10-03 Siemens Aktiengesellschaft Load changer for switching step windings of a three-phase transformer

Cited By (7)

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Publication number Priority date Publication date Assignee Title
WO2000010182A1 (en) * 1998-08-12 2000-02-24 Maschinenfabrik Reinhausen Gmbh Step switch with selector
US6849813B1 (en) 1998-08-12 2005-02-01 Maschinenfabrik Reinhausen Gmbh Step switch with selector
CZ297115B6 (en) * 1998-08-12 2006-09-13 Maschinenfabrik Reinhausen Gmbh Step switch with preselector
CN102623155A (en) * 2011-01-30 2012-08-01 上海华明电力设备制造有限公司 Integrated plug-pull combined type vacuum on-load tap changer
CN103415904A (en) * 2011-03-18 2013-11-27 赖茵豪森机械制造公司 Load stepping switch
CN103415904B (en) * 2011-03-18 2016-09-07 赖茵豪森机械制造公司 Load ratio bridging switch
WO2017144241A1 (en) * 2016-02-26 2017-08-31 Siemens Aktiengesellschaft Arrangement for electrostatically shielding an electric system

Also Published As

Publication number Publication date
DE3776434D1 (en) 1992-03-12
CN87104614A (en) 1988-01-27
KR880002205A (en) 1988-04-29
EP0252400A3 (en) 1989-11-02
JPS6328016A (en) 1988-02-05
EP0252400B1 (en) 1992-01-29
JP2609248B2 (en) 1997-05-14
CN1013718B (en) 1991-08-28
ATE72359T1 (en) 1992-02-15
KR960013034B1 (en) 1996-09-25
IN169357B (en) 1991-09-28

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