EP0001387A1 - Tap changer with a screening electrode - Google Patents

Tap changer with a screening electrode Download PDF

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Publication number
EP0001387A1
EP0001387A1 EP78100612A EP78100612A EP0001387A1 EP 0001387 A1 EP0001387 A1 EP 0001387A1 EP 78100612 A EP78100612 A EP 78100612A EP 78100612 A EP78100612 A EP 78100612A EP 0001387 A1 EP0001387 A1 EP 0001387A1
Authority
EP
European Patent Office
Prior art keywords
diverter switch
spiral
tap
housing
tap changer
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
EP78100612A
Other languages
German (de)
French (fr)
Other versions
EP0001387B1 (en
Inventor
Karl Ing.Grad. Stenzel
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 Gebr SCHEUBECK & O KG GmbH
Scheubeck GmbH and Co
Original Assignee
MASCHINENFABRIK REINHAUSEN Gebr SCHEUBECK & O KG GmbH
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6017350&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0001387(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by MASCHINENFABRIK REINHAUSEN Gebr SCHEUBECK & O KG GmbH, Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG filed Critical MASCHINENFABRIK REINHAUSEN Gebr SCHEUBECK & O KG GmbH
Publication of EP0001387A1 publication Critical patent/EP0001387A1/en
Application granted granted Critical
Publication of EP0001387B1 publication Critical patent/EP0001387B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F29/025—Constructional details of transformers or reactors with tapping on coil or windings

Definitions

  • the invention relates to a tap changer as described in the preamble of the associated patent claim 1.
  • Step switches that are equipped with special shielding electrodes are known. There are usually several shield rings placed around the housing of the diverter switch as well as large trough-shaped shielding bodies, which e.g. are arranged around the dropout gear, applied (brochure T 2031 D / 6303 of the Oerlikon machine factory, Zurich, Switzerland, "Transformers of high performance").
  • These shields should not only ensure a homogenization of the electrical field, they must also be suitable for avoiding partial discharges, since the freedom from partial discharges is generally required for transformers under given conditions.
  • the possibility that partial discharges can occur at the tap changer must be taken into account particularly if the tap changer is arranged relatively close to the transformer's boiler wall and if the sharp-edged parts inside the tap changer that are live and come into contact with the boiler wall come very close. In such cases, the shields offer good protection against partial discharges.
  • One difficulty lies in the fact that relatively large-area bodies - for example diverter switches with a dropout gear - are required if necessary, must be included in the shielding. The shielding body itself then becomes very large and complex and is difficult to manufacture.
  • the object of the invention is to provide a tap changer which is equipped with a shield which is easy to manufacture and has a large area. This object is achieved by the means specified in the characterizing part of patent claim 1.
  • the advantage that can be achieved with the invention is, in particular, that a large-area shielding is achieved, the shielding body itself being able to be produced with simple means and in a simple manner.
  • a material for the shielding body e.g. Commercially available copper pipe is used, which is first wound onto a template adapted to the contours of the tap changer and which is then removed from the template and pushed as a whole over the part of the tap changer to be shielded.
  • Simple wooden slats with multiple notches can be used to support the spiral and to fix the individual turns of the spiral, which can be easily attached to the flanges of the tap changer.
  • the new tap changer consists essentially of a tap changer head 1, a cylindrical diverter switch 2, a dropout gear 3 and a tap selector 4.
  • a first shield ring 5 is arranged, which is connected in an electrically conductive manner to the tap changer head 1 via its brackets 16, which is therefore at the ground potential of the tap changer head.
  • a shielding spiral 7 is arranged underneath it, both around the lower part of the diverter switch 2 as well as around the dropout gear 3 of the tap selector 4.
  • the individual turns of the shielding spiral 7 are inserted into notches 8 of several wooden slats 9 and are thus fixed.
  • the wooden slats 9 are fastened in a manner not shown in detail to the lower flange 10 of the diverter switch 2 as well as to the upper cage ring 14 of the step selector 4.
  • the upper end 11 of the shielding spiral 7 is connected to the ring line 12 provided on the outside of the diverter switch, which either forms the star point or serves to divert the load.
  • the lower end 13 of the shielding spiral 7 is electrically conductively connected to the upper cage ring 14 of the step selector and thus also to the dropout gear 3. It thus simultaneously creates the required potential connection between these parts.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

1. Tap-changing switch with a load diverter switch (2) sitting in a cylindrical housing and with a tap selector (4), which is arranged there-under and which is actuable by an intermittent gear (3) arranged between load diverter switch housing and tap selector, and with at least one annular screening (5) arranged externally on the load diverter switch housing for evening out the electric field emanating from the potential-carrying parts of the load diverter switch, characterised thereby, that the annular screening is laid as helix (7) around the load diverter switch housing (2) as well as around the intermittent gear (3), wherein at least one end (11, 13) of the helix is connected to the potential of the star point (12) in the case of three-phase tap-changing switches or to the grounding (12) in the case of single-phase tap-changing switches.

Description

Die Erfindung bezieht sich auf einen Stufenschalter, wie er im Oberbegriff des zugehörigen Patentanspruches 1 näher bezeichnet ist.The invention relates to a tap changer as described in the preamble of the associated patent claim 1.

Stufenschalter, die mit speziellen Abschirmelektroden ausgerüstet sind, sind bekannt. Es werden hierfür üblicherweise mehrere um das Gehäuse des Lastumschalters gelegte Schirmringe wie auch große wannenförmig ausgebildete Abschirmkörper, die z.B. um das Aussetzgetriebe herum angeordnet sind, angewendet (Prospekt T 2031 D/6303 der Maschinenfabrik Oerlikon, Zürich, Schweiz, "Transformatoren großer Leistung").Step switches that are equipped with special shielding electrodes are known. There are usually several shield rings placed around the housing of the diverter switch as well as large trough-shaped shielding bodies, which e.g. are arranged around the dropout gear, applied (brochure T 2031 D / 6303 of the Oerlikon machine factory, Zurich, Switzerland, "Transformers of high performance").

Diese Abschirmungen sollen nicht nur für eine Homogenisierung des elektrischen Feldes sorgen, sondern sie müssen darüberhinaus zur Vermeidung von Teilentladungen geeignet sein, da die Teilentladungs-Freiheit für Transformatoren unter gegebenen Voraussetzungen im allgemeinen gefordert wird. Die Möglichkeit, daß Teilentladungen am Stufenschalter auftreten können, ist besonders dann zu beachten, wenn der Stufenschalter relativ nahe an der Kesselwand des Transformators angeordnet wird und wenn somit die im Innern des Stufenschalters vorhandenen scharfkantigen Teile, die potentialführend sind, der Kesselwand sehr nahe kommen. In derartigen Fällen bieten die Abschirmungen einen guten Schutz gegen Teilentladungen. Eine Schwierigkeit liegt jedoch darin, daß relativ großflächige Körper - z.B. Lastumschalter mit Aussetzgetriebe - erforderlichenfalls in die Abschirmung miteinbezogen werden müssen. Die Abschirmkörper werden dann selbst sehr großflächig und aufwendig und sind schwierig herzustellen.These shields should not only ensure a homogenization of the electrical field, they must also be suitable for avoiding partial discharges, since the freedom from partial discharges is generally required for transformers under given conditions. The possibility that partial discharges can occur at the tap changer must be taken into account particularly if the tap changer is arranged relatively close to the transformer's boiler wall and if the sharp-edged parts inside the tap changer that are live and come into contact with the boiler wall come very close. In such cases, the shields offer good protection against partial discharges. One difficulty, however, lies in the fact that relatively large-area bodies - for example diverter switches with a dropout gear - are required if necessary, must be included in the shielding. The shielding body itself then becomes very large and complex and is difficult to manufacture.

Aufgabe der Erfindung ist es, einen Stufenschalter anzugeben, der mit einer einfach herzustellenden großflächig wirkenden Abschirmung ausgerüstet ist. Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Patentanspruches 1 angegebenen Mittel gelöst.The object of the invention is to provide a tap changer which is equipped with a shield which is easy to manufacture and has a large area. This object is achieved by the means specified in the characterizing part of patent claim 1.

Der mit der Erfindung erzielbare Vorteil liegt insbesondere darin, daß eine großflächig wirkende Abschirmung erzielt wird, wobei der Abschirmkörper selbst mit einfachen Mitteln und auf einfache Weise herstellbar ist. Als Material für den Abschirmkörper kann z.B. handelsübliches Kupferrohr Verwendung finden, welches zunächst auf eine den Konturen des Stufenschalters angepaßte Schablone gewickelt wird und welches dann von der Schablone heruntergenommen und als Ganzes über den abzuschirmenden Teil des Stufenschalters geschoben wird. Als Träger der Spirale und zur Fixierung der einzelnen Windungen der Spirale können einfache mit mehreren Kerben versehene Holzlatten eingesetzt werden, die an den Flanschen des Stufenschalters leicht zu befestigen sind.The advantage that can be achieved with the invention is, in particular, that a large-area shielding is achieved, the shielding body itself being able to be produced with simple means and in a simple manner. As a material for the shielding body, e.g. Commercially available copper pipe is used, which is first wound onto a template adapted to the contours of the tap changer and which is then removed from the template and pushed as a whole over the part of the tap changer to be shielded. Simple wooden slats with multiple notches can be used to support the spiral and to fix the individual turns of the spiral, which can be easily attached to the flanges of the tap changer.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben: Wie aus der Figur ersichtlich, besteht der neue Stufenschalter im wesentlichen aus einem Stufenschalterkopf 1, einem zylindrischen Lastumschalter 2, einem Aussetzgetriebe 3 und einem Stufenwähler 4. Im oberen Bereich des zylindrischen Lastumschalters 2 ist ein erster Schirmring 5 angeordnet, der über seine Halterungen 16 elektrisch leitend mit dem Stufenschalterkopf 1 verbunden ist, der also am Erdpotential des Stufenschalterkopfes liegt. Unter Einhaltung eines Abstandes 6 für die Erdisolation ist darunter eine Abschirmspirale 7 angeordnet, die sowohl um den unteren Teil des Lastumschalters 2 wie auch um das Aussetzgetriebe 3 des Stufenwählers 4 herumgelegt ist. Die einzelnen Windungen der Abschirmspirale 7 sind in Kerben 8 mehrerer Holzlatten 9 eingelegt und somit fixiert. Die Holzlatten 9 sind auf im einzelnen nicht dargestellte Weise am unteren Flansch 10 des Lastumschalters 2 wie auch am oberen Käfigring 14 des Stufenwählers 4 befestigt. Das obere Ende 11 der Abschirmspirale 7 ist an der außen am Lastumschalter vorgesehenen Ringleitung 12, die entweder den Sternpunkt bildet oder der Lastableitung dient, angeschlossen. Das untere Ende 13 der Abschirmspirale 7 ist elektrisch leitend mit dem oberen Käfigring 14 des Stufenwählers und somit auch mit dem Aussetzgetriebe 3 verbunden. Sie stellt somit gleichzeitig die erforderliche Potentialverbindung zwischen diesen Teilen her. Soweit eine Stromführung über die Abschirmspirale, die induktiv auftreten könnte, vermieden werden muß, genügt es, wenn nur ein Ende, z.B. 11, der Abschirmspirale 7 angeschlossen wird. Die darüberhinaus erforderliche Potentialverbindung zwischen der Ringleitung 12 und dem Aussetzgetriebe 3 bzw. dem oberen Käfigring 14 wie auch dem unteren Käfigring 15 des Stufenwählers 4 kann dann auf herkömmliche Weise vorgenommen werden.An embodiment of the invention is shown in the drawing and is described in more detail below: As can be seen from the figure, the new tap changer consists essentially of a tap changer head 1, a cylindrical diverter switch 2, a dropout gear 3 and a tap selector 4. In the upper area of the cylindrical load switch 2, a first shield ring 5 is arranged, which is connected in an electrically conductive manner to the tap changer head 1 via its brackets 16, which is therefore at the ground potential of the tap changer head. While maintaining a distance 6 for the earth insulation, a shielding spiral 7 is arranged underneath it, both around the lower part of the diverter switch 2 as well as around the dropout gear 3 of the tap selector 4. The individual turns of the shielding spiral 7 are inserted into notches 8 of several wooden slats 9 and are thus fixed. The wooden slats 9 are fastened in a manner not shown in detail to the lower flange 10 of the diverter switch 2 as well as to the upper cage ring 14 of the step selector 4. The upper end 11 of the shielding spiral 7 is connected to the ring line 12 provided on the outside of the diverter switch, which either forms the star point or serves to divert the load. The lower end 13 of the shielding spiral 7 is electrically conductively connected to the upper cage ring 14 of the step selector and thus also to the dropout gear 3. It thus simultaneously creates the required potential connection between these parts. Insofar as current routing via the shielding spiral, which could occur inductively, must be avoided, it is sufficient if only one end, for example 11, of the shielding spiral 7 is connected. The potential connection between the ring line 12 and the dropout gear 3 or the upper cage ring 14 as well as the lower cage ring 15 of the step selector 4, which is also required, can then be carried out in a conventional manner.

Claims (2)

1. Stufenschalter mit einem in einem zylindrischen Gehäuse sitzenden Lastumschalter und mit einem darunter angeordneten Stufenwähler, der mittels eines zwischen Lastumschaltergehäuse und Stufenwähler angeordneten Aussetzgetriebes betätigbar ist und mit mindestens einer außen am Lastumschaltergehäuse angeordneten ringförmigen Abschirmung zur Vergleichmäßigung des von den potentialführenden Teilen des Lastumschalters ausgehenden elektrischen Feldes, dadurch gekennzeichnet, daß die ringförmige Abschirmung als Spirale (7) sowohl um das Lastumschaltergehäuse (2), wie auch um das Aussetzgetriebe (3) gelegt ist, wobei mindestens ein Ende (11, 13) der Spirale an das Potential des Sternpunktes (12) bei dreiphasigen bzw. der Ableitung (12) bei einphasigen Stufenschaltern angeschlossen ist.1.Taped switch with a diverter switch located in a cylindrical housing and with a step selector arranged underneath, which can be actuated by means of a drop-out gear arranged between diverter switch housing and step selector and with at least one ring-shaped shield arranged on the outside of the diverter switch housing to equalize the electrical output from the live parts of the diverter switch Field, characterized in that the annular shield as a spiral (7) is placed around the diverter switch housing (2) as well as around the dropout gear (3), with at least one end (11, 13) of the spiral being connected to the potential of the star point ( 12) is connected to three-phase tap changers or the derivative (12) to single-phase tap changers. 2. Stufenschalter nach Anspruch 1, gekennzeich- n e t, durch mehrere sowohl am Lastumschalter (2) wie auch am Stufenwähler (4) befestigte Holzlatten (9) mit einer Vielzahl von Kerben (8), in welche die einzelnen Windungen der Spirale (7) eingelegt sind.2. Step switch according to claim 1, marked by several wooden slats (9) fastened to both the diverter switch (2) and to the step selector (4) with a plurality of notches (8) into which the individual turns of the spiral (7) are inserted.
EP78100612A 1977-08-26 1978-08-07 Tap changer with a screening electrode Expired EP0001387B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2738481 1977-08-26
DE2738481A DE2738481C3 (en) 1977-08-26 1977-08-26 Step switch with a diverter switch seated in a cylindrical housing and with a step selector arranged underneath

Publications (2)

Publication Number Publication Date
EP0001387A1 true EP0001387A1 (en) 1979-04-18
EP0001387B1 EP0001387B1 (en) 1980-07-23

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ID=6017350

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78100612A Expired EP0001387B1 (en) 1977-08-26 1978-08-07 Tap changer with a screening electrode

Country Status (3)

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EP (1) EP0001387B1 (en)
JP (1) JPS5463225A (en)
DE (1) DE2738481C3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016203106A1 (en) 2016-02-26 2017-08-31 Siemens Aktiengesellschaft Arrangement for the electrostatic shielding of an electrical system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100442410C (en) * 2006-06-02 2008-12-10 武汉泰普变压器开关有限公司 Off-circuit tap-changer with shielding device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE333785C (en) * 1919-03-23 1921-03-05 Siemens & Halske Akt Ges Transformer for high frequency and voltage, the high voltage winding of which is designed in the manner of the jackets of truncated cones
DE1185715B (en) * 1961-06-22 1965-01-21 Reinhausen Gebr Scheubeck K G Step switching device for multi-phase high voltage transformers
DE7420948U (en) * 1974-10-03 Transformatoren Union Ag Shielding ring for diverter switch

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7420948U (en) * 1974-10-03 Transformatoren Union Ag Shielding ring for diverter switch
DE333785C (en) * 1919-03-23 1921-03-05 Siemens & Halske Akt Ges Transformer for high frequency and voltage, the high voltage winding of which is designed in the manner of the jackets of truncated cones
DE1185715B (en) * 1961-06-22 1965-01-21 Reinhausen Gebr Scheubeck K G Step switching device for multi-phase high voltage transformers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016203106A1 (en) 2016-02-26 2017-08-31 Siemens Aktiengesellschaft Arrangement for the electrostatic shielding of an electrical system
WO2017144241A1 (en) 2016-02-26 2017-08-31 Siemens Aktiengesellschaft Arrangement for electrostatically shielding an electric system

Also Published As

Publication number Publication date
JPS5463225A (en) 1979-05-22
DE2738481B2 (en) 1980-01-24
DE2738481C3 (en) 1980-09-18
DE2738481A1 (en) 1979-03-01
EP0001387B1 (en) 1980-07-23

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