EP0141303B1 - Step transformer with a cylinder of insulating material for an on-load tap-changer - Google Patents
Step transformer with a cylinder of insulating material for an on-load tap-changer Download PDFInfo
- Publication number
- EP0141303B1 EP0141303B1 EP84112064A EP84112064A EP0141303B1 EP 0141303 B1 EP0141303 B1 EP 0141303B1 EP 84112064 A EP84112064 A EP 84112064A EP 84112064 A EP84112064 A EP 84112064A EP 0141303 B1 EP0141303 B1 EP 0141303B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- insulating material
- wound
- fibres
- insulating
- 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.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
- H01B17/60—Composite insulating bodies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/32—Single insulators consisting of two or more dissimilar insulating bodies
Definitions
- the invention relates to a step transformer according to the preamble of the claim.
- tap changers of tap transformers are provided with insulating cylinders which form a supporting structure for the fixed tap contacts.
- the object of the invention is therefore the above To improve the insulating cylinder so that the cylinder wall, in addition to sufficient mechanical strength, above all has high dielectric strength for as many directions as possible. This object is achieved by the means specified in the characterizing part of the claim.
- the invention is based on the fact that the wall of an insulating cylinder made of epoxy resin with a wound reinforcement made of glass fibers, which has hardened under vacuum, cannot be regarded as a homogeneous insulating material. With such a material, the dielectric strength must be considered depending on the direction of the stress. Two directions of stress are to be considered, namely the stress in the fiber direction and the stress transverse to the fiber direction. The stress in the fiber direction will always result in less favorable values than a stress in the cross-grain direction. The reason for this is to be seen in the fact that individual threads are sometimes not properly wetted by the resin and this can lead to directional breakdown channels along the threads between two points of different potential.
- the wound reinforcement is now made exclusively from a multi-layer wound fiberglass mat, which consists of non-directional fibers, the length of which is less than the smallest distance between two adjacent fixed step contacts of different potential, direct channel formation between metal parts can no longer occur different potential come. It is important that this applies to all directions due to the undirected short fibers. For an occasionally irregular arrangement of contacts with different potentials in the cylinder wall, it is therefore no longer necessary to take particular account of whether the dielectric stress occurs transversely to the fiber or along the fiber. The advantage achieved with the invention is therefore to be seen in the fact that overall the dielectric strength of the cylinder wall is improved for any direction. In other words, when arranging contacts in the cylinder wall, the fiber course of the reinforcement no longer needs to be given special consideration.
Landscapes
- Insulating Of Coils (AREA)
- Insulating Bodies (AREA)
- Inorganic Insulating Materials (AREA)
- Glass Compositions (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Die Erfindung bezieht sich auf einen Stufentransformator gemäß dem Oberbegriff des Patentanspruches.The invention relates to a step transformer according to the preamble of the claim.
Es ist bekannt, daß Stufenschalter von Stufentransformatoren mit Isolierstoffzylindern versehen sind, die eine Tragkonstruktion für die feststehenden Stufenkontakte bilden.It is known that tap changers of tap transformers are provided with insulating cylinders which form a supporting structure for the fixed tap contacts.
Aus der DE-OS 2 264 341 ist es bekannt, solche Isolierstoffzylinder als Wickelhohlkörper auszuführen, und zwar wird der Wickel trocken auf einen Wickeldorn aufgebracht, wonach das Ganze in eine geschlossene zylindrische Form kommt und evakuiert wird, um dann mit Epoxydharz aufgefüllt zu werden. Als Wickelmaterial werden entweder durchgehende Fäden oder auch Gewebebahnen verwendet. Mit dieser Methode lassen sich hochwertige Isolierstoffzylinder mit insbesondere hoher mechanischer Festigkeit herstellen. Bei den genannten Isolierzylindern kommt es jedoch nicht allein auf die mechanische Beanspruchung des Wickelhohlkörpers an, sondern zur mechanischen Beanspruchung kommen spezielle dielektrische Beanspruchungen hinzu, insbesondere wenn an unterschiedlichen Stellen in der Zylinderwand Kontakte unterschiedlichen elektrischen Potentials sitzen. Hier spielt die Spannungsbeanspruchung zwischen den einzelnen Kontakten eine besondere Rolle.From DE-OS 2 264 341 it is known to design such insulating cylinders as hollow winding bodies, namely the winding is applied dry to a winding mandrel, after which the whole thing comes in a closed cylindrical shape and is evacuated, in order then to be filled with epoxy resin. Either continuous threads or fabric webs are used as the winding material. This method can be used to manufacture high-quality insulating cylinders with particularly high mechanical strength. In the case of the insulating cylinders mentioned, however, it is not only the mechanical stress on the winding hollow body that is important, but rather special dielectric stresses are added to the mechanical stress, in particular when contacts of different electrical potential are located at different points in the cylinder wall. The voltage stress between the individual contacts plays a special role here.
Bei einem Stufentransformator mit einem Isolierstoffzylinder für einen Stufenschalter treten wegen der Vielzahl der anzuordnenden feststehenden Stufenkontakte unterschiedlichen Potentials erhebliche Probleme bezüglich der dielektrischen Beanspruchung des Isoliermaterials auf. Bei einem mit durchgehenden Fäden oder Gewebebahnen gewickelten Isolierstoffzylinder läßt es sich praktisch nicht vermeiden, daß die gewickelten Fäden direkt von einem Stufenkontakt zum anderen verlaufen, so daß die dielektrische Festigkeit des Isolierstoffes dann nicht mehr ausreichend ist.In the case of a step transformer with an insulating material cylinder for a step switch, considerable problems arise with regard to the dielectric stress on the insulating material because of the large number of fixed step contacts to be arranged with different potentials. In the case of an insulating material cylinder wound with continuous threads or fabric webs, it cannot be practically avoided that the wound threads run directly from one step contact to the other, so that the dielectric strength of the insulating material is then no longer sufficient.
Aufgabe der Erfindung ist es demnach, den eingangs genannten Isolierstoffzylinder so zu verbessern, daß die Zylinderwand neben einer ausreichenden mechanischen Festigkeit vor allem eine hohe dielektrische Festigkeit für möglichst alle Richtungen aufweist. Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Patentanspruches angegebenen Mittel gelöst.The object of the invention is therefore the above To improve the insulating cylinder so that the cylinder wall, in addition to sufficient mechanical strength, above all has high dielectric strength for as many directions as possible. This object is achieved by the means specified in the characterizing part of the claim.
Die Erfindung geht von der Tatsache aus, daß die Wand eines Isolierstoffzylinders aus Epoxydharz mit einer gewickelten Armierung aus Glasfasern, die unter Vakuum ausgehärtet ist, nicht als homogenes Isoliermaterial angesehen werden kann. Bei einem solchen Material muß die dielektrische Festigkeit abhängig von der Beanspruchungsrichtung angesehen werden. Dabei sind vorzugsweise zwei Beanspruchungsrichtungen zu betrachten, und zwar die Beanspruchung in Faserrichtung und die Beanspruchung quer zur Faserrichtung. Dabei wird die Beanspruchung in Faserrichtung immer ungünstigere Werte ergeben als eine Beanspruchung quer zur Faserrichtung. Die Ursache dafür ist darin zu sehen, daß einzelne Fäden mitunter nicht einwandfrei vom Harz benetzt sind und es damit zu gerichteten Durchschlagskanälen entlang den Fäden zwischen zwei Punkten unterschiedlichen Potentials kommen kann. Wird nun - wie vorgeschlagen - die gewickelte Armierung ausschließlich aus einer mehrlagig gewickelten Glasfasermatte ausgeführt, die aus ungerichteten Fasern besteht, deren Länge geringer ist als der geringste Abstand zwischen zwei benachbarten feststehenden Stufenkontakten unterschiedlichen Potentials, so kann es nicht mehr zu einer direkten Kanalbildung zwischen Metallteilen unterschiedlichen Potentials kommen. Hierbei ist wesentlich, daß dies infolge der ungerichteten Kurzfasern für alle beliebigen Richtungen gilt. Für eine mitunter unregelmäßige Anordnung von Kontakten unterschiedlichen Potentials in der Zylinderwand braucht also nicht mehr besonders berücksichtigt zu werden, ob die dielektrische Beanspruchung quer zur Faser oder längs zur Faser auftritt. Der mit der Erfindung erzielte Vorteil ist demnach darin zu sehen, daß insgesamt die dielektrische Spannungsfestigkeit der Zylinderwand für jede beliebige Richtung verbessert ist. D.h., bei der Anordnung von Kontakten in der Zylinderwand braucht praktisch der Faserverlauf der Armierung nicht mehr besonders berücksichtigt zu werden.The invention is based on the fact that the wall of an insulating cylinder made of epoxy resin with a wound reinforcement made of glass fibers, which has hardened under vacuum, cannot be regarded as a homogeneous insulating material. With such a material, the dielectric strength must be considered depending on the direction of the stress. Two directions of stress are to be considered, namely the stress in the fiber direction and the stress transverse to the fiber direction. The stress in the fiber direction will always result in less favorable values than a stress in the cross-grain direction. The reason for this is to be seen in the fact that individual threads are sometimes not properly wetted by the resin and this can lead to directional breakdown channels along the threads between two points of different potential. If - as suggested - the wound reinforcement is now made exclusively from a multi-layer wound fiberglass mat, which consists of non-directional fibers, the length of which is less than the smallest distance between two adjacent fixed step contacts of different potential, direct channel formation between metal parts can no longer occur different potential come. It is important that this applies to all directions due to the undirected short fibers. For an occasionally irregular arrangement of contacts with different potentials in the cylinder wall, it is therefore no longer necessary to take particular account of whether the dielectric stress occurs transversely to the fiber or along the fiber. The advantage achieved with the invention is therefore to be seen in the fact that overall the dielectric strength of the cylinder wall is improved for any direction. In other words, when arranging contacts in the cylinder wall, the fiber course of the reinforcement no longer needs to be given special consideration.
Natürlich ist die mechanische Festigkeit eines derartigen Isolierstoffzylinders gegenüber einem Isolierstoffzylinder, dessen Wickel aus durchgehenden Fäden aufgebaut ist, geringer. Dies kann jedoch in Kauf genommen werden, da der genannte Isolierstoffzylinder z.B. keine Druckdifferenzen zwischen innen und außen aufzunehmen hat.Of course, the mechanical strength of such an insulating material cylinder is lower than that of an insulating material cylinder, the winding of which is made up of continuous threads. However, this can be accepted, since the said insulating cylinder e.g. has no pressure differences between inside and outside.
Claims (1)
- Tapped transformer with a cylinder of insulating material for a tap selector switch, wherein a plurality, of stationary tap contacts penetrate the wall of the insulating materal cylinder serving as supporting structure and wherein the insulating material cylinder furthermore consists of resin systems curable under vacuum with a wound armouring of glass fibres, wherein the wound armouring consists exclusively of a glass fibre mat which has been wound in several layers and consists of unaligned fibres, the length of which is smaller than the smallest spacing between two neighbouring stationary tap contacts of different potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT84112064T ATE62352T1 (en) | 1983-10-19 | 1984-10-09 | TAP TRANSFORMER WITH AN INSULATED CYLINDER FOR A TAP SWITCH. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19833337954 DE3337954A1 (en) | 1983-10-19 | 1983-10-19 | INSULATING CYLINDER FOR HIGH DIELECTRIC LOADS |
| DE3337954 | 1983-10-19 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0141303A2 EP0141303A2 (en) | 1985-05-15 |
| EP0141303A3 EP0141303A3 (en) | 1988-03-02 |
| EP0141303B1 true EP0141303B1 (en) | 1991-04-03 |
Family
ID=6212199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84112064A Expired - Lifetime EP0141303B1 (en) | 1983-10-19 | 1984-10-09 | Step transformer with a cylinder of insulating material for an on-load tap-changer |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0141303B1 (en) |
| JP (1) | JPS60101817A (en) |
| AT (1) | ATE62352T1 (en) |
| DE (1) | DE3337954A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3537142A1 (en) * | 1985-10-18 | 1987-04-23 | Reinhausen Maschf Scheubeck | INSULATING PIPE PRODUCED IN FILAMENT WINDING PROCESS |
| DE3630295A1 (en) * | 1986-09-05 | 1988-03-17 | Reinhausen Maschf Scheubeck | Method for producing an insulating material cylinder for high dielectric stresses |
| DE19610113C2 (en) * | 1996-03-14 | 1998-01-22 | Reinhausen Maschf Scheubeck | Process for producing a fiber-reinforced insulating body |
| JP4913392B2 (en) * | 2005-12-02 | 2012-04-11 | ルネサスエレクトロニクス株式会社 | Attenuator |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1665556A1 (en) * | 1966-02-18 | 1971-02-11 | Siemens Ag | Cast resin insulator and process for its manufacture |
| US3979709A (en) * | 1975-05-22 | 1976-09-07 | The Chase-Shawmut Company | Electric fuse having a multiply casing of a synthetic - resin glass-cloth laminate |
| DE2845463C3 (en) * | 1978-10-19 | 1982-02-25 | Maschinenfabrik Reinhausen Gebrüder Scheubeck GmbH & Co KG, 8400 Regensburg | Load selector for step transformers |
-
1983
- 1983-10-19 DE DE19833337954 patent/DE3337954A1/en active Granted
-
1984
- 1984-10-09 AT AT84112064T patent/ATE62352T1/en not_active IP Right Cessation
- 1984-10-09 EP EP84112064A patent/EP0141303B1/en not_active Expired - Lifetime
- 1984-10-18 JP JP59217475A patent/JPS60101817A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0560202B2 (en) | 1993-09-01 |
| ATE62352T1 (en) | 1991-04-15 |
| DE3337954A1 (en) | 1985-05-02 |
| JPS60101817A (en) | 1985-06-05 |
| EP0141303A2 (en) | 1985-05-15 |
| DE3337954C2 (en) | 1993-02-25 |
| EP0141303A3 (en) | 1988-03-02 |
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