EP0029164A1 - High tension through-lead - Google Patents

High tension through-lead Download PDF

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Publication number
EP0029164A1
EP0029164A1 EP80106779A EP80106779A EP0029164A1 EP 0029164 A1 EP0029164 A1 EP 0029164A1 EP 80106779 A EP80106779 A EP 80106779A EP 80106779 A EP80106779 A EP 80106779A EP 0029164 A1 EP0029164 A1 EP 0029164A1
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Prior art keywords
layer
insulating
voltage
electrically conductive
potential
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EP80106779A
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German (de)
French (fr)
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EP0029164B1 (en
Inventor
Günther Matthäus
Joachim Dr. Ruffer
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Siemens AG
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Siemens AG
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    • 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
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/28—Capacitor type

Definitions

  • the invention relates to a high-voltage bushing with conductor parts lying at high voltage potential and at earth potential, and an insulation body made of wound insulating foils arranged between them, which contains electrically conductive potential control inserts and is optionally impregnated with a special insulating medium.
  • a high-voltage bushing with such an insulator is known from British Patent 1,129,995.
  • connection points of electrical devices with high operating voltages of, for example, 100 kV and higher high-voltage parts of these devices have to be passed through parts that are at ground potential in such a way that flashovers are avoided with certainty.
  • a corresponding connection point for example the end closure of a high-voltage cable or the connection of a high-voltage transformer.
  • Corresponding insulating bushings may also be required for converters and switchgear.
  • the electrically conductive parts in the high-voltage bushings which are at high voltage potential, are surrounded by special bushing insulators.
  • the bushing insulator known from British Patent 1,129,995 is wound from a flexible, electrically insulating material, for example a special film-like paper.
  • so-called electrically conductive potential control inserts are wound concentrically to one another and insulated from one another in this bushing insulator. With these inserts, the voltage distribution can be controlled via the feedthrough insulator and thus an increase in the resistance to partial discharge and surge voltage (see e.g. P.Böning: Little Textbook of Electrical Strength, Düsseldorf, 1955, pages 140 to 142).
  • the partial discharge and surge voltage resistance are essentially limited by the axial electrical field strength at the outer edges of the electrically conductive potential control inserts.
  • the outer edges of the potential control inserts therefore end in bulges like thickening, for example due to a fold of the control inserts around an annularly bent wire, so as to obtain the largest possible radius of curvature of the outer edge.
  • these outer edges can also be surrounded by a layer of a material with a high dielectric constant (cf. CH-PSen 244 927 and 223 139).
  • the object of the present invention is now to improve the high-voltage bushing of the type mentioned at the outset in such a way that the partial discharge and surge voltage resistance of its bushing insulator are further increased.
  • This object is achieved in that double-layer films each having a layer of electrically conductive material and a layer of an insulating material with a high dielectric constant ⁇ r are provided as potential control inserts and that the double-layer films on their sides facing the outer boundary surfaces of the insulation body so to edges are folded that the insulating layer encloses the electrically conductive layer.
  • the advantages of this design of the high-voltage bushing are in particular that allow the double-layer films to fold to edges with a sufficiently small radius of curvature so that wrinkling of the insulation films when winding the insulation body can be ruled out.
  • the outer edges of the control inserts do not protrude directly into the gusset-like cavities formed on them, possibly filled with the insulating medium, between adjacent turns of the insulating wrapping films, since the outer edges are surrounded by the insulating dielectric of the insulating layers.
  • the electrical field strength at the metal edges is thus advantageously reduced and the partial discharge and surge voltage resistance of the high-voltage bushing are improved accordingly.
  • FIG. 1 schematically illustrates a high-voltage bushing.
  • Fig. 2 shows schematically a part of this high-voltage bushing designed according to the invention.
  • the high-voltage bushing shown as a longitudinal section in FIG. 1 can, for example, be part of an end closure of a high-voltage cable (cf. "3rd International Symposium on High Voltage Engineering", Milan, August 28-31, 1979, report No. 32.09).
  • the bushing contains a central conductor 2, which is a copper tube, for example, and is at high voltage potential, for example 200 kV at 50 Hz.
  • An insulating body 3 is arranged concentrically around the conductor, which has two beveled conical jacket-shaped side parts 4 and 5 and a cylindrical jacket surface 6 in between. This insulation body is wound from an insulating film, for example from a special paper or a plastic film.
  • capacitor inserts 7 to 10 which are indicated in the figure by lines parallel to the axis and are used for potential control, are arranged in the insulation body 3 concentrically with respect to one another and isolated from one another. These capacitor inserts are advantageously stepped at one end so that an approximately linear potential gradient can form along the bevelled side surfaces 4 and 5 of the insulating body 3 from the inside to the outside.
  • the approximately linear potential characteristic on the side surfaces 4 and 5 can be achieved in a known manner by a suitable choice of the radial distances between the individual capacitor inserts and by their axial lengths (see, for example, US Pat. No. 3,462,545).
  • the innermost capacitor inserts and designated 8 and 9 are at high voltage potential, while the outermost capacitor insert 10 is on the outer surface 6 with an electrical connection 11 at ground potential.
  • this can optionally be impregnated with an insulating medium.
  • Suitable media include special oils or gases such as SF 6 .
  • the insulation body 2 is impregnated with SF 6 (cf. CIGRE 1972, Paper No. 15-02).
  • the insulation body can also be covered by a cryogenic medium such as e.g. be impregnated with helium (cf. DE-OS 2 327 629).
  • the section of the insulating body 3 of a high-voltage bushing according to the invention contains two capacitor control inserts made of double-layer films, which are arranged parallel to one another and are generally designated 7 and 10. These double-layer films each contain an electrically conductive layer 14 and an insulating layer 15.
  • the insulating layer consists of a material with a high dielectric constant £.
  • the Dielek Tricity constant can in particular be greater than 2, preferably greater than 3.
  • Special plastic materials are particularly suitable.
  • aluminum-laminated films made of a plastic such as polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP) or polycarbonate (PC) can advantageously be provided as double-layer films.
  • Hard PVC material for example, has a dielectric constant Er of about 3.8 to 4.3 at room temperature.
  • the double-layer films used for potential control are arranged in the winding 3 and folded on the sides facing the beveled side surface 4 to edges 17 such that the insulating layers 15 each point outwards. This ensures that, at least in the edge region, the folded edges 18 formed with the electrically conductive layers 14 are always tightly enclosed by the insulating material of the insulating layers 15. Since both the electrically conductive material and the plastic materials can be folded or bent relatively easily with a small radius of curvature, kinks or breaks at the edges can be avoided.
  • the folded double-layer films 7 and 10 are each arranged between adjacent layers 19 and 20 of insulation films, from which the insulation body 3 is wound.
  • the insulation foils can consist, for example, of a plastic material such as polypropylene.
  • a gusset-shaped cavity 22 is formed between the adjacent insulation foil layers 19 and 20, which fills with the insulation medium, for example the SF 6 gas.
  • the fold edges designated 18 of the electrically conductive layers 14 of the control inserts 7 and 10 do not protrude directly into these cavities 22, but instead are tightly enclosed there by the solid insulation material with high dielectric constants of the insulating layers 15, a direct one becomes Avoid contact of the outer fold edges 18 of the electrically conductive layers 14 with the insulating gas in the cavities 22.
  • the electric field strength produced at edges 17 is accordingly correspondingly lower than in the insulating gas and consequently the partial discharge and surge voltage resistance are also increased accordingly.
  • the high-voltage bushing according to the invention is also suitable for electrical devices in which high-voltage potential is present on the outside and earth potential on the inside.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)
  • Insulating Bodies (AREA)

Abstract

Eine Hochspannungsdurchführung kann mit auf Hochspannungspotential und auf Erdpotential liegenden Leiterteilen sowie eine dazwischen angeordneten Isolationskörper versehen sein, der aus isoliertolien gewickelt ist, elektrisch leitende, innerhalb des Isolationskörpers endende Potentialsteuereinlagen enthält und gegebenenfalls von einem Isoliermedium getränkt ist. Bei einer solchen Hochspannungsdurchführung sind die Teilentladungs- und Stoßspannungsfestigkeit wesentlich durch die axiale elektrische Feldstärke an den äußeren Kanten der Potentialsteuereinlagen begrenzt. Die Erfindung sieht deshalb vor, daß als Potentialsteuereinlagen Doppelschichtfolien (7, 10) mit jeweils einer Schicht (14) aus elektrisch leitendem Material und einer Schicht (15) aus einem isolierenden Material mit einer hohen Dielektrizitätskonstanten εr vorgesehen sind und daß die Doppelschichtfolien (7, 10) an ihren den äußeren Begrenzungsflächen (4) des Isolationskörpers (3) zugewandten Seiten so zu Kanten (17, 18) gefalzt sind, daß jewels die isolierende Schicht (15) die elektrisch leitende Schicht (14, 18) umschließt. Als Doppelschichtfolien (7, 10) können insbesondere mit Aluminium kaschierte Folien aus einem Kunststoff vorgesehen werden.A high-voltage bushing can be provided with conductor parts lying at high-voltage potential and at earth potential, as well as an insulation body arranged between them, which is wound from insulating foils, contains electrically conductive potential control inserts ending within the insulation body and, if appropriate, is impregnated with an insulating medium. In such a high-voltage bushing, the partial discharge and surge voltage resistance are essentially limited by the axial electrical field strength on the outer edges of the potential control inserts. The invention therefore provides that double-layer films (7, 10), each with a layer (14) made of electrically conductive material and a layer (15) made of an insulating material with a high dielectric constant εr, are provided as potential control inserts, and that the double-layer films (7, 10) are folded on their outer boundary surfaces (4) of the insulating body (3) sides to edges (17, 18) so that the insulating layer (15) surrounds the electrically conductive layer (14, 18). Double-layer films (7, 10), in particular films made of a plastic and laminated with aluminum, can be provided.

Description

Die Erfindung bezieht sich auf eine Hochspannungsdurchführung mit auf Hochspannungspotential und auf Erdpotential liegenden Leiterteilen sowie einem dazwischen angeordneten Isolationskörper aus gewickelten Isolierfolien, der elektrisch leitende Potentialsteuereinlagen enthält und gegebenenfalls von einem besonderen Isoliermedium getränkt ist. Eine derartige Hochspannungsdurchführung mit einem solchen Isolator ist aus der britischen Patentschrift 1,129,995 bekannt.The invention relates to a high-voltage bushing with conductor parts lying at high voltage potential and at earth potential, and an insulation body made of wound insulating foils arranged between them, which contains electrically conductive potential control inserts and is optionally impregnated with a special insulating medium. Such a high-voltage bushing with such an insulator is known from British Patent 1,129,995.

An den Anschlußstellen von elektrischen Einrichtungen mit hohen Betriebsspannungen von beispielsweise 100 kV und höher müssen hochspannungsführende Teile dieser Einrichtungen durch auf Erdpotential liegende Teile so isoliert hindurchgeführt werden, daß mit Sicherheit Überschläge vermieden werden. Eine entsprechende Anschlußstelle stellt beispielsweise der Endverschluß eines Hochspannungskabels oder der Anschluß eines Hochspannungstransformators dar. Auch bei Wandlern und Schaltanlagen können entsprechende isolierende Durchführungen erforderlich sein.At the connection points of electrical devices with high operating voltages of, for example, 100 kV and higher, high-voltage parts of these devices have to be passed through parts that are at ground potential in such a way that flashovers are avoided with certainty. A corresponding connection point, for example the end closure of a high-voltage cable or the connection of a high-voltage transformer. Corresponding insulating bushings may also be required for converters and switchgear.

Zur Vermeidung solcher unerwünschter Überschläge sind die auf Hochspannungspotential liegenden elektrisch leitenden Teile in den Hochspannungsdurchführungen von besonderen Durchführungsisolatoren umgeben.To avoid such undesirable flashovers, the electrically conductive parts in the high-voltage bushings, which are at high voltage potential, are surrounded by special bushing insulators.

Der aus der britischen Patentschrift 1,129,995 bekannte Durchführungsisolator ist aus einem flexiblen, elektrisch isolierenden Material, beispielsweise einem folienartigen Spezialpapier, gewickelt. Außerdem sind in diesen Durchführungsisolator sogenannte elektrisch leitende Potentialsteuereinlagen konzentrisch zueinander und gegeneinander isoliert mit eingewickelt. Mit diesen Einlagen läßt sich eine Steuerung der Spannungsverteilung über den Durchführungsisolator und somit eine Erhöhung der Teilentladungs- und Stoßspannungsfestigkeit erreichen (vgl. z.B. P.Böning: Kleines Lehrbuch der elektrischen Festigkeit, Karlsruhe, 1955, Seiten 140 bis 142).The bushing insulator known from British Patent 1,129,995 is wound from a flexible, electrically insulating material, for example a special film-like paper. In addition, so-called electrically conductive potential control inserts are wound concentrically to one another and insulated from one another in this bushing insulator. With these inserts, the voltage distribution can be controlled via the feedthrough insulator and thus an increase in the resistance to partial discharge and surge voltage (see e.g. P.Böning: Little Textbook of Electrical Strength, Karlsruhe, 1955, pages 140 to 142).

Ferner ist es bekannt, daß bei Hochspannungsdurchführungsisolatoren aus gewickelten Isolierstofffolien mit kapazitiver Potentialsteuerung die Teilentladungs- und Stoßspannungsfestigkeit im wesentlichen durch die axiale elektrische Feldstärke an den äußeren Kanten der elektrisch leitenden Potentialsteuereinlagen begrenzt werden. Bei bekannten Hochspannungsdurchführungsisolatoren enden deshalb die äußeren Kanten der Potentialsteuereinlagen in wulstartigen Verdickungen, beispielsweise aufgrund einer Falzung der Steuereinlagen um einen ringförmig gebogenen Draht, um so einen möglichst großen Krümmungsradius der Außenkante zu erhalten. Außerdem können diese Außenkanten noch mit einer Schicht aus einem Material mit hoher Dielektrizitätskonstanten umgeben sein (vgl. CH-PSen 244 927 und 223 139). Bei diesen Hochspannungsdurchführungsisolatoren befinden sich jedoch die wulstartigen Außenkanten der Potentialsteuereinlagen stets außerhalb des gewickelten Isolationskörpers, da sich diese Kanten nicht ohne weiteres mit in einen Isolierwickel einwickeln lassen, weil sonst die Gefahr eines zu lockeren Aufbaus des Wickels und von Faltungen einzelner Wickelfolien bestünde.Furthermore, it is known that in high-voltage bushing insulators made of wound insulating films with capacitive potential control, the partial discharge and surge voltage resistance are essentially limited by the axial electrical field strength at the outer edges of the electrically conductive potential control inserts. In known high-voltage bushing insulators, the outer edges of the potential control inserts therefore end in bulges like thickening, for example due to a fold of the control inserts around an annularly bent wire, so as to obtain the largest possible radius of curvature of the outer edge. In addition, these outer edges can also be surrounded by a layer of a material with a high dielectric constant (cf. CH-PSen 244 927 and 223 139). With these high-voltage bushing insulators, however, the bead-like outer edges of the potential control inserts are always outside the wound insulation body, since these edges cannot easily be wrapped in an insulating winding, because otherwise there would be a risk of the winding being too loose and of individual wrapping foils being folded.

Aufgabe der vorliegenden Erfindung ist es nun, die Hochspannungsdurchführung der eingangs genannten Art dahingehend zu verbessern, daß die Teilentladungs- und Stoßspannungsfestigkeit ihres Durchführungsisolators weiter erhöht sind.The object of the present invention is now to improve the high-voltage bushing of the type mentioned at the outset in such a way that the partial discharge and surge voltage resistance of its bushing insulator are further increased.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß als Potentialsteuereinlagen Doppelschichtfolien mit jeweils einer Schicht aus elektrisch leitendem Material und einer Schicht aus einem isolierenden Material mit einer hohen Dielektrzitätskonstanten εr vorgesehen sind und daß die Doppelschichtfolien an ihren den äußeren Begrenzungsflächen des Isolationskörpers zugewandten Seiten so zu Kanten gefalzt sind, daß jeweils die isolierende Schicht die elektrisch leitende Schicht umschließt.This object is achieved in that double-layer films each having a layer of electrically conductive material and a layer of an insulating material with a high dielectric constant ε r are provided as potential control inserts and that the double-layer films on their sides facing the outer boundary surfaces of the insulation body so to edges are folded that the insulating layer encloses the electrically conductive layer.

Die Vorteile dieser Gestaltung der Hochspannungsdurchführung liegen insbesondere darin, daß sich die Doppelschichtfolien zu Kanten mit hinreichend kleinem Krümmungsradius falzen lassen, so daß eine Faltenbildung der Isolationsfolien beim Wickeln des Isolationskörpers ausgeschlossen werden kann. Außerdem ragen die äußeren Kanten der Steuereinlagen nicht unmittelbar in die an ihnen ausgebildeten zwickelartigen, gegebenenfalls mit dem Isoliermedium gefüllten Hohlräume zwischen benachbarten Windungen aus den isolierenden Wickelfolien, da die äußeren Kanten mit dem isolierenden Dielektrikum der isolierenden Schichten umgeben sind. Somit wird vorteilhaft die elektrische Feldstärke an den Metallkanten herabgesetzt und werden entsprechend die Teilentladungs- und Stoßspannungsfestigkeit der Hochspannungsdurchführung verbessert.The advantages of this design of the high-voltage bushing are in particular that allow the double-layer films to fold to edges with a sufficiently small radius of curvature so that wrinkling of the insulation films when winding the insulation body can be ruled out. In addition, the outer edges of the control inserts do not protrude directly into the gusset-like cavities formed on them, possibly filled with the insulating medium, between adjacent turns of the insulating wrapping films, since the outer edges are surrounded by the insulating dielectric of the insulating layers. The electrical field strength at the metal edges is thus advantageously reduced and the partial discharge and surge voltage resistance of the high-voltage bushing are improved accordingly.

Vorteilhafte Ausgestaltungen der Hochspannungsdurchführung nach der Erfindung gehen aus den Unteransprüchen hervor.Advantageous refinements of the high-voltage bushing according to the invention emerge from the subclaims.

Zur weiteren Erläuterung der Erfindung und deren in den Unteransprüchen gekennzeichneten Ausbildungen wird auf die Zeichnung Bezug genommen, in deren Fig. 1 eine Hochspannungsdurchführung schematisch veranschaulicht ist. Fig. 2 zeigt schematisch einen gemäß der Erfindung ausgebildeten Teil dieser Hochspannungsdurchführung.To further explain the invention and its features characterized in the subclaims, reference is made to the drawing, in which FIG. 1 schematically illustrates a high-voltage bushing. Fig. 2 shows schematically a part of this high-voltage bushing designed according to the invention.

Die in Fig. 1 als Längsschnitt dargestellte Hochspannungsdurchführung kann z.B. Teil eines Endverschlusses eines Hochspannungskabels sein (vgl. "3rd Int. Symposium on High Voltage Engineering", Mailand, 28. - 31.8.1979, Bericht Nr. 32.09). Die Durchführung enthält einen zentralen Leiter 2, der z.B. ein Kupferrohr ist und auf Hochspannungspotential, beispielsweise 200 kV bei 50 Hz, liegt. Um den Leiter ist konzentrisch ein Isolationskörper 3 angeordnet, der zwei abgeschrägte kegelmantelförmige Seitenteile 4 und 5 und dazwischen eine zylinderförmige Mantelfläche 6 aufweist. Dieser Isolationskörper ist aus einer isolierenden Folie, beispielsweise aus einem Spezialpapier oder einer Kunststoffolie, gewickelt. In dem Isolationskörper 3 sind konzentrisch zueinander und isoliert gegeneinander sogenannte Kondensatoreinlagen 7 bis 10 angeordnet, die in der Figur durch achsenparallele Linien angedeutet sind und zur Potentialsteuerung dienen. Diese Kondensatoreinlagen sind an ihrem einen Ende vorteilhaft so abgestuft zueinander angeordnet, daß sich längs der abgeschrägten Seitenflächen 4 und 5 des Isolationskörpers 3 von innen nach außen ein annähernd lineares Potentialgefälle ausbilden kann. Die annähernd lineare Potentialcharakteristik an den Seitenflächen 4 und 5 läßt sich dabei in bekannter Weise durch eine geeignete Wahl der radialen Abstände zwischen den einzelnen Kondensatoreinlagen sowie durch ihre axialen Längen erreichen (vgl. z.B. US-Patentschrift 3,462,545). Die innersten leiternahen und mit 8 und 9 bezeichneten Kondensatoreinlagen liegen dabei auf Hochspannungspotential, während sich die äußerste Kondensatoreinlage 10 an der Mantelfläche 6 mit einem elektrischen Anschluß 11 auf Erdpotential befindet.The high-voltage bushing shown as a longitudinal section in FIG. 1 can, for example, be part of an end closure of a high-voltage cable (cf. "3rd International Symposium on High Voltage Engineering", Milan, August 28-31, 1979, report No. 32.09). The bushing contains a central conductor 2, which is a copper tube, for example, and is at high voltage potential, for example 200 kV at 50 Hz. An insulating body 3 is arranged concentrically around the conductor, which has two beveled conical jacket-shaped side parts 4 and 5 and a cylindrical jacket surface 6 in between. This insulation body is wound from an insulating film, for example from a special paper or a plastic film. So-called capacitor inserts 7 to 10, which are indicated in the figure by lines parallel to the axis and are used for potential control, are arranged in the insulation body 3 concentrically with respect to one another and isolated from one another. These capacitor inserts are advantageously stepped at one end so that an approximately linear potential gradient can form along the bevelled side surfaces 4 and 5 of the insulating body 3 from the inside to the outside. The approximately linear potential characteristic on the side surfaces 4 and 5 can be achieved in a known manner by a suitable choice of the radial distances between the individual capacitor inserts and by their axial lengths (see, for example, US Pat. No. 3,462,545). The innermost capacitor inserts and designated 8 and 9 are at high voltage potential, while the outermost capacitor insert 10 is on the outer surface 6 with an electrical connection 11 at ground potential.

Zur Erhöhung der Spannungsfestigkeit des Isolationskörpers 3 kann dieser gegebenenfalls von einem isolierenden Medium durchtränkt sein. Geeignete Medien sind z.B. spezielle Öle oder Gase wie SF6. Gemäß dem Ausführungsbeispiel nach der Figur sei angenommen, daß der Isolationskörper 2 mit SF6 getränkt ist (vgl. CIGRE 1972, Paper No. 15-02).In order to increase the dielectric strength of the insulation body 3, this can optionally be impregnated with an insulating medium. Suitable media include special oils or gases such as SF 6 . According to the embodiment according to the figure assumed that the insulation body 2 is impregnated with SF 6 (cf. CIGRE 1972, Paper No. 15-02).

Falls die Hochspannungsdurchführung für eine auf Tieftemperatur befindliche Einrichtung, beispielsweise für den Endverschluß eines supraleitenden Kabels, vorgesehen sein soll, kann der Isolat'ons- körper auch von einem kryogenen Medium wie z.B. von Helium durchtränkt sein (vgl. DE-OS 2 327 629).If the high-voltage bushing is to be provided for a device at low temperature, for example for the end closure of a superconducting cable, the insulation body can also be covered by a cryogenic medium such as e.g. be impregnated with helium (cf. DE-OS 2 327 629).

Es hat sich nun gezeigt, daß die Teilentladungs-und Stoßspannungsfestigkeit einer solchen Durchführung wesentlich durch die axiale elektrische Feldstärke an den äußeren, d.h. den abgeschrägten Seitenflächen 4 und 5 zugewandten Kanten der elektrisch leitenden Potentialsteuereinlagen 7 bis 10 begrenzt werden. Gemäß der Erfindung sind deshalb diese äußeren Kanten der Steuereinlagen besonders gestaltet. Diese Gestaltung geht aus Fig. 2 näher hervor, in der ein entsprechendes, in Fig. 1 mit 12 bezeichnetes Teilstück des Isolationskörpers 3 vergrößert dargestellt ist. Mit Fig. 1 übereinstimmende Teile sind dabei mit denselben Bezugszeichen versehen.It has now been shown that the partial discharge and surge voltage resistance of such a bushing depends essentially on the axial electrical field strength on the outer, i.e. the bevelled side surfaces 4 and 5 facing edges of the electrically conductive potential control inserts 7 to 10 are limited. According to the invention, these outer edges of the tax deposits are therefore specially designed. This design is shown in more detail in FIG. 2, in which a corresponding section of the insulation body 3, designated by 12 in FIG. 1, is shown enlarged. Parts corresponding to FIG. 1 are provided with the same reference numerals.

Das als Längsschnitt in Fig. 2 dargestellte Teilstück des Isolationskörpers 3 einer Hochspannungsdurchführung nach der Erfindung enthält zwei parallel zueinander angeordnete, allgemein mit 7 und 10 bezeichnete Kondensatorsteuereinlagen aus Doppelschichtfolien. Diese Doppelschichtfolien enthalten jeweils eine elektrisch leitende Schicht 14 und eine isolierende Schicht 15. Die isolierende Schicht besteht dabei gemäß der Erfindung aus einem Material mit hoher Dielektrizitätskonstanten £ . Die Dielektrizitätskonstante kann insbesondere größer als 2, vorzugsweise größer als 3 sein. Besonders geeignet sind spezielle Kunststoffmaterialien. Beispielsweise können als Doppelschichtfolien vorteilhaft mit Aluminium kaschierte Folien aus einem Kunststoff wie Polyvinylchlorid (PVC), Polyäthylen (PE), Polypropylen (PP) oder Polycarbonat (PC) vorgesehen werden. Hartes PVC-Material z.B. hat bei Raumtemperatur eine Dielektrizitätskonstante Er von etwa 3,8 bis 4,3. Die zur Potentialsteuerung dienenden Doppelschichtfolien sind in dem Wickel 3 so angeordnet und an den der abgeschrägten Seitenfläche 4 zugewandten Seiten so zu Kanten 17 gefalzt, daß die isolierenden Schichten 15 jeweils nach außen weisen. Es ist so gewährleistet, daß zumindest im Kantenbereich die mit den elektrisch leitenden Schichten 14 gebildeten gefalzten Kanten 18 stets von dem isolierenden Material der isolierenden Schichten 15 dicht umschlossen sind. Da sich sowohl das elektrich leitende Material als auch die Kunststoffmaterialien verhältnismäßig leicht mit kleinem Krümmungsradius falzen bzw. biegen lassen, können dabei Knicke oder Brüche an den Kanten vermieden werden.The section of the insulating body 3 of a high-voltage bushing according to the invention, shown as a longitudinal section in FIG. 2, contains two capacitor control inserts made of double-layer films, which are arranged parallel to one another and are generally designated 7 and 10. These double-layer films each contain an electrically conductive layer 14 and an insulating layer 15. According to the invention, the insulating layer consists of a material with a high dielectric constant £. The Dielek Tricity constant can in particular be greater than 2, preferably greater than 3. Special plastic materials are particularly suitable. For example, aluminum-laminated films made of a plastic such as polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP) or polycarbonate (PC) can advantageously be provided as double-layer films. Hard PVC material, for example, has a dielectric constant Er of about 3.8 to 4.3 at room temperature. The double-layer films used for potential control are arranged in the winding 3 and folded on the sides facing the beveled side surface 4 to edges 17 such that the insulating layers 15 each point outwards. This ensures that, at least in the edge region, the folded edges 18 formed with the electrically conductive layers 14 are always tightly enclosed by the insulating material of the insulating layers 15. Since both the electrically conductive material and the plastic materials can be folded or bent relatively easily with a small radius of curvature, kinks or breaks at the edges can be avoided.

Die gefalzten Doppelschichtfolien 7 und 10 sind jeweils zwischen benachbarten Lagen 19 und 20 von Isolationsfolien angeordnet, aus denen der Isolationskörper 3 gewickelt ist. Die Isolationsfolien können beispielsweise aus einem Kunststoffmaterial wie Polypropylen bestehen. Vor den der abgeschrägten Seitenfläche 4 des Isolationskörpers 3 zugewandten Kanten 17 der Steuereinlagen 7 bzw. 10 ist zwischen den benachbarten Isolationsfolienlagen 19 und 20 jeweils ein zwickelförmiger Hohlraum 22 ausgebildet, der sich mit dem Isolationsmedium, beispielsweise dem SF6-Gas, füllt. Da gemäß der Erfindung die mit 18 bezeichneten Falzkanten der elektrisch leitenden Schichten 14 der Steuereinlagen 7 und 10 nicht unmittelbar in diese Hohlräume 22 hineinragen, sondern dort von dem festen Isolationsmaterial mit hoher Dielektrizitätskonstanten er der iso-ierenden Schichten 15 dicht umschlossen sind, wird ein unmittelbarer Kontakt der äußeren Falzkanten 18 der elektrisch leitenden Schichten 14 mit dem isolierenden Gas in den Hohlräumen 22 vermieden. Die an Kanten 17 hervorgerufene elektrische Feldstärke ist somit entsprechend geringer als in dem isolierenden Gas und sind folglich auch die Teilentladungs- und Stoßspannungsfestigkeit entsprechend erhöht.The folded double-layer films 7 and 10 are each arranged between adjacent layers 19 and 20 of insulation films, from which the insulation body 3 is wound. The insulation foils can consist, for example, of a plastic material such as polypropylene. In front of the edges 17 of the control inserts 7 and 10 facing the beveled side surface 4 of the insulation body 3, a gusset-shaped cavity 22 is formed between the adjacent insulation foil layers 19 and 20, which fills with the insulation medium, for example the SF 6 gas. Since, according to the invention, the fold edges designated 18 of the electrically conductive layers 14 of the control inserts 7 and 10 do not protrude directly into these cavities 22, but instead are tightly enclosed there by the solid insulation material with high dielectric constants of the insulating layers 15, a direct one becomes Avoid contact of the outer fold edges 18 of the electrically conductive layers 14 with the insulating gas in the cavities 22. The electric field strength produced at edges 17 is accordingly correspondingly lower than in the insulating gas and consequently the partial discharge and surge voltage resistance are also increased accordingly.

Gemäß dem Ausführungsbeispiel nach den Figuren ist davon ausgegangen, daß ein auf Hochspannungspotential liegender elektrischer Leiter zentral angeordnet ist und von einem Isolationskörper umgeben ist. Die Hochspannungsdurchführung nach der Erfindung ist jedoch ebensogut auch für elektrische Einrichtungen geeignet, bei denen an der Außenseite Hochspannungspotential und innen Erdpotential anliegen.According to the exemplary embodiment according to the figures, it is assumed that an electrical conductor which is at high voltage potential is arranged centrally and is surrounded by an insulation body. However, the high-voltage bushing according to the invention is also suitable for electrical devices in which high-voltage potential is present on the outside and earth potential on the inside.

Claims (4)

1. Hochspannungsdurchführung mit auf Hochspannungspotential und auf Erdpotential liegenden Leiterteilen sowie einem dazwischen angeordneten Isolationskörper aus gewickelten Isolierfolien, der elektrisch leitende, innerhlalb des Isolationskörpers endende Potentialsteuereinlagen enthält und gegebenenfalls von einem besonderen Isoliermedium getränkt ist, dadurch gekennzeichnet , daß als Potentialsteuereinlagen (7 bis 10) Doppelschichtfolien (7, 10) mit jeweils einer Schicht (14) aus elektrisch leitendem Material und einer Schicht (15) aus einem isolierenden Material mit einer hohen Dielektrizitätskonstanten εr vorgesehen sind und daß die Doppelschichtfolien an ihren den äußeren Begrenzungsflächen (4, 5) des Isolationskörpers (3) zugewandten Seiten so zu Kanten (17, 18) gefalzt sind, daß jeweils die isolierende Schicht (15) die elektrisch leitende Schicht (14) umschließt.1. High-voltage bushing with conductor parts lying at high voltage potential and at earth potential and an insulation body made of wound insulating foils arranged in between, which contains electrically conductive potential control inserts ending inside the insulation body and, if appropriate, is soaked in a special insulation medium, characterized in that as potential control inserts (7 to 10) Double-layer films (7, 10) are provided, each with a layer (14) made of electrically conductive material and a layer (15) made of an insulating material with a high dielectric constant ε r , and that the double-layer films on their outer boundary surfaces (4, 5) Insulation body (3) facing sides are folded to edges (17, 18) so that the insulating layer (15) encloses the electrically conductive layer (14). 2. Hochspannungsdurchführung nach Anspruch 1, .gekennzeichnet durch eine Dielektrizitätskonstante εr des isolierenden Materials (15) bei Raumtemperatur von mindestens 2, vorzugsweise mindestens 3.2. High-voltage bushing according to claim 1, characterized by a dielectric constant ε r of the insulating material (15) at room temperature of at least 2, preferably at least 3. 3. Hochspannungsdurchführung nach Anspruch 1 oder 2, dadurch gekennzeichnet , daß die Schichten (15) aus isolierendem Material von Folien aus einem Kunststoff gebildet sind.3. High-voltage bushing according to claim 1 or 2, characterized in that the layers (15) made of insulating material from foils made of a plastic. 4. Hochspannungsdurchführung nach Anspruch 3, dadurch gekennzeichnet , daß als Doppelschichtfolien (7, 10) mit Aluminium kaschierte Folien aus dem Kunststoff vorgesehen sind.4. High-voltage bushing according to claim 3, characterized in that as double-layer films (7, 10) with aluminum-laminated films made of plastic are provided.
EP80106779A 1979-11-15 1980-11-04 High tension through-lead Expired EP0029164B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80106779T ATE4521T1 (en) 1979-11-15 1980-11-04 HIGH VOLTAGE JACKET.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792946172 DE2946172A1 (en) 1979-11-15 1979-11-15 HIGH VOLTAGE PROCEDURE
DE2946172 1979-11-15

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EP0029164A1 true EP0029164A1 (en) 1981-05-27
EP0029164B1 EP0029164B1 (en) 1983-08-24

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US (1) US4370514A (en)
EP (1) EP0029164B1 (en)
AT (1) ATE4521T1 (en)
DE (1) DE2946172A1 (en)

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EP0244957A1 (en) * 1986-04-08 1987-11-11 Raychem Gmbh Electrical apparatus for controlling electrical stress
WO1998019315A1 (en) * 1996-10-25 1998-05-07 Siemens Aktiengesellschaft Insulator assembly
DE19856123A1 (en) * 1998-12-04 2000-07-06 Siemens Ag Hollow insulator

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US5281767A (en) * 1992-10-30 1994-01-25 A.B. Chance Company Reduced mechanical stress bushing and conductor rod assembly
DE102005021255B4 (en) * 2005-05-02 2007-08-16 Siemens Ag Barrier system for the line feedthrough of an electrical system
CH698971A1 (en) * 2008-06-04 2009-12-15 Trench Switzerland Ag Isolation device.
EP2375423A1 (en) 2010-04-07 2011-10-12 ABB Research Ltd. Electrical bushing
WO2011154029A1 (en) * 2010-06-07 2011-12-15 Abb Research Ltd High-voltage sensor with axially overlapping electrodes
EP2431982B1 (en) * 2010-09-21 2014-11-26 ABB Technology AG Plugable feedthrough and high voltage assembly with such a feedthrough
EP2528071B1 (en) * 2011-05-27 2018-08-08 ABB Schweiz AG High voltage arrangement comprising an insulating structure
DE102018201160A1 (en) * 2018-01-25 2019-07-25 Pfisterer Kontaktsysteme Gmbh High voltage bushing, electrical device with high voltage bushing and method of manufacturing the electrical device
EP3667684A1 (en) 2018-12-12 2020-06-17 ABB Schweiz AG Electrical bushing
US20230041971A1 (en) 2019-12-30 2023-02-09 Hitachi Energy Switzerland Ag Condenser bushing

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EP0244957A1 (en) * 1986-04-08 1987-11-11 Raychem Gmbh Electrical apparatus for controlling electrical stress
WO1998019315A1 (en) * 1996-10-25 1998-05-07 Siemens Aktiengesellschaft Insulator assembly
DE19856123A1 (en) * 1998-12-04 2000-07-06 Siemens Ag Hollow insulator
DE19856123C2 (en) * 1998-12-04 2000-12-07 Siemens Ag Hollow insulator
US6534721B2 (en) 1998-12-04 2003-03-18 Siemens Aktiengesellschaft Hollow insulator and production method

Also Published As

Publication number Publication date
EP0029164B1 (en) 1983-08-24
US4370514A (en) 1983-01-25
DE2946172A1 (en) 1981-05-21
ATE4521T1 (en) 1983-09-15

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