EP0032690B1 - Foil-insulated high-tension feed-through comprising voltage-control insertions - Google Patents

Foil-insulated high-tension feed-through comprising voltage-control insertions Download PDF

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Publication number
EP0032690B1
EP0032690B1 EP81100119A EP81100119A EP0032690B1 EP 0032690 B1 EP0032690 B1 EP 0032690B1 EP 81100119 A EP81100119 A EP 81100119A EP 81100119 A EP81100119 A EP 81100119A EP 0032690 B1 EP0032690 B1 EP 0032690B1
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Prior art keywords
potential control
insulating
foils
control inserts
wound
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German (de)
French (fr)
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EP0032690A2 (en
EP0032690A3 (en
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Günther Matthäus
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Siemens AG
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Siemens AG
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00Insulators or insulating bodies characterised by their form
    • H01B17/26Lead-in insulators; Lead-through insulators
    • H01B17/28Capacitor type

Definitions

  • the invention relates to a high-voltage bushing with conductor parts at different electrical potentials and with an insulation body arranged between these conductor parts, which is wound from insulating foils, contains thin, provided with a knot, electrically conductive foils as potential control inserts and is impregnated with a gaseous insulating medium.
  • a high-voltage bushing is known from FR-E-44 238 in connection with FR-A-742 448.
  • connection points of electrical devices with high operating voltages of, for example, 100 kV and higher high-voltage parts of these devices must be passed through parts that are at ground potential in such a way that arcing between these parts can be avoided with certainty.
  • a corresponding connection point is, for example, the end closure of a high-voltage cable or the connection of a high-voltage transformer.
  • Corresponding insulated 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 geometric dimensions of which are determined, among other things, by the required electrical strength values.
  • a high-voltage bushing is also known, the insulating body of which is wound from trapezoidal insulating films made of paper. These insulating foils can be provided with embossed bands on their edges. In addition, potential control inserts, which also have an embossing, are also wrapped in the insulation body.
  • the object of the invention is to improve this known insulation body of a high-voltage bushing so that it can also be used for devices with high operating voltages and at the same time a sufficient impregnation with an insulating medium, in particular on its potential control inserts, is ensured.
  • the high-voltage bushing it can advantageously be ensured, on the one hand, that cavities formed on the potential control inserts during the winding process, in particular on the edges, are always only filled with the insulating medium, since between the nubbed control inserts and the respectively adjacent insulating foils, which are also embossed, there is sufficient gas permeability. This gas permeability is ensured by the predetermined height of the knobs.
  • the wound insulation body also has sufficient mechanical strength, ie slipping on the central conductor serving as a winding mandrel when the high-voltage bushing is arranged vertically, can be avoided.
  • FIG. 1 schematically illustrates a high-voltage bushing.
  • 2 schematically shows a part of this high-voltage bushing designed according to the invention.
  • the bushing contains a central conductor 2, which is, for example, a copper tube and has a high-voltage potential of over 200 kV at 50 Hz.
  • the central conductor preferably consists of a stainless steel or aluminum tube.
  • An insulating body 3 is arranged concentrically around the conductor, which has two beveled, conical jacket-shaped side surfaces 4 and 5 and between them a cylindrical jacket surface 6.
  • This insulating body is wound from insulating foils made of a plastic material with a high dielectric constant, such as polypropylene foils.
  • capacitor inserts 7 to 10 are provided concentrically to one another and isolated from one another, which are indicated in the figure by lines parallel to the central conductor 2.
  • These capacitor inserts which are used for potential control and are especially designed in accordance with the invention, are expediently arranged in such a way that an approximately linear potential gradient can form from the inside to the outside along the bevelled side surfaces 4 and 5 of the insulation body 3.
  • This 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 (cf. for example US Pat. No. 3,462,545).
  • the innermost conductor near and designated 8 and 9 capacitor deposits are, for example on high-voltage potential, while the outermost capacitor pad 10 on the jacket '- surface 6 is with an electrical terminal 11 at ground potential.
  • Suitable media include gases such as sulfur hexafluoride (SF 6 ) or nitrogen (N 2 ). According to the exemplary embodiment according to the figure, an SF 6 limitation of the insulation body is assumed.
  • the insulation body can also be made of a cryogenic medium such as e.g. be impregnated with helium (cf. DE-A-2 327 629).
  • the insulation body 3 of a high-voltage bushing contains, according to the section 12 shown in FIG. 2 as a longitudinal section, thin potential control inserts which are provided with a knot and of which only one capacitor insert, designated 10, is illustrated in the figure.
  • the capacitor control inserts can be made, for example, from a thin foil made of a metal such as aluminum, as is generally known from GB-A-991 546 for smooth foils. Films made of a plastic such as polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP) or polycarbonate (PC) are also suitable as potential control deposits. According to the invention, these tax deposits contain between 300 and 700, preferably about 500 knobs per cm 2.
  • the tax deposits should each have a total thickness that is at least 50% greater than the thickness of a corresponding one Foil without knobs.
  • an 18 1 1m aluminum foil can be used, which has a total thickness of about 40 ⁇ m with the knobs. It is much easier to handle such a nubbed film when winding the insulating body 3 than with a smooth film, since the nubbed film is mechanically more stable.
  • the insulating body is also wound from smooth insulating foils 14, which are made of polypropylene or polyethylene, for example. Between each two layers of smooth insulation foils 14 there is also a layer of embossed insulation foils 15. These foils are also provided with a knot, for example containing about 500 knobs / cm 2 .
  • insulating sheets 15 of the same type are provided on both sides of the potential control insert, capacitor insert 10.
  • the cavities formed by the nubbing of the potential control insert (capacitor insert 10) and the adjacent insulation foils 15, some of which are denoted by 16 in the figure are relatively easy to evacuate after the winding process of the insulation body and to fill them with the insulating medium.
  • the conductor part of the high-voltage bushing which is at high voltage potential is arranged centrally and that the conductor parts which are at earth potential surround it, the insulation body being provided between these conductor parts.
  • 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.

Abstract

A high voltage insulating bushing is formed of wound insulating foils and is provided with conductive parts which are at different electrical potentials and with a wound insulating body arranged between the conductive parts. The wound insulating body contains potential control inserts which are formed of embossed electrically conductive foils, and which are impregnated with an insulating medium. The resulting embossed potential control inserts are mechanically more stable than known potential control inserts which are formed of smooth foils. In one embodiment, the embossed potential control inserts may be wound between adjacent layers of embossed insulating foils so as to facilitate the evacuation of air occluded in the winding and the complete permeation of the portion of the winding near the potential control inserts with the insulating medium.

Description

Die Erfindung bezieht sich auf eine Hochspannungsdurchführung mit auf unterschiedlichem elektrischen Potential liegenden Leiterteilen sowie mit einem zwischen diesen Leiterteilen angeordneten Isolationskörper, der aus Isolierfolien gewickelt ist, dünne, mit einer Noppung versehene elektrisch leitende Folien als Potentialsteuereinlagen enthält und von einem gasförmigen Isoliermedium getränkt ist. Eine derartige Hochspannungsdurchführung ist aus der FR-E-44 238 in Verbindung mit der FR-A-742 448 bekannt.The invention relates to a high-voltage bushing with conductor parts at different electrical potentials and with an insulation body arranged between these conductor parts, which is wound from insulating foils, contains thin, provided with a knot, electrically conductive foils as potential control inserts and is impregnated with a gaseous insulating medium. Such a high-voltage bushing is known from FR-E-44 238 in connection with FR-A-742 448.

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 zwischen diesen Teilen vermieden werden. Eine entsprechende Anschlussstelle stellt beispielsweise der Endverschluss eines Hochspannungskabels oder der Anschluss eines Hochspannungstransformators dar. Auch bei Wandlern und Schaltanlagen können entsprechende isolierte 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 must be passed through parts that are at ground potential in such a way that arcing between these parts can be avoided with certainty. A corresponding connection point is, for example, the end closure of a high-voltage cable or the connection of a high-voltage transformer. Corresponding insulated 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, deren geometrische Abmessungen unter anderem durch die geforderten elektrischen Festigkeitswerte festgelegt sind.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, the geometric dimensions of which are determined, among other things, by the required electrical strength values.

Ein aus der Literaturstelle «PROC. IEE», Vol. 112, Jan. 1965, Seiten 89 bis 102 bekannter Durchführungsisolator ist aus flexiblen Kunststoffolien gewickelt. Ausserdem sind in diesen Isolator noch dünne metallische Folien als 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).One from the literature reference «PROC. IEE », vol. 112, Jan. 1965, pages 89 to 102 known bushing insulator is wound from flexible plastic films. In addition, thin metallic foils are wrapped in this insulator as so-called electrically conductive potential control inserts concentrically with one another and insulated from one another. These inserts can be used to control the voltage distribution via the bushing insulator and thus to increase the partial discharge and surge voltage resistance (see e.g. P. Böning: Little Textbook of Electrical Strength, Karlsruhe 1955, pages 140 to 142).

In dem bekannten gewickelten Durchführungsisolator vorhandene Spalte und Hohlräume sollen mit Schwefelhexafluorid (SF.) als Isoliermedium gefüllt sein, da bekanntlich die Teilentladungs-Einsatzfeldstärke in SFs mindestens doppelt so hoch ist wie in Luft. Die in dem Wickel des Isolators vorhandene Luft muss deshalb abgepumpt und durch das SFs-Gas ersetzt werden. Da ferner bei derartigen Hochspannungsdurchführungsisolatoren aus gewickelten Isolierstoffolien mit kapazitiver Potentiatsteuerung die Teilentladungs- und Stossspannungsfestigkeit im wesentlichen durch die axiale elektrische Feldstärke an den äusseren Kanten der elektrisch leitenden Potentialsteuereinlagen begrenzt werden, muss insbesondere gewährleistet sein, dass sich zumindest diese Kanten in dem besonderen Isoliermedium befinden. Bei dem bekannten Durchführungsisolator ist jedoch ein Ersetzen der Luft durch SFs an diesen Stellen erschwert, da die dünnen Metallfolien der Potentialsteuereinlagen flächig von den benachbarten Isolierfolien eingeschlossen sind und somit ein Gasaustausch an ihneh verhältnismässig schwer zu erreichen ist.In the known wound bushing insulator existing column and cavities are to be filled with sulfur hexafluoride (SF.) As the insulating medium, there is known the use of partial discharge field t ärke in SF s is at least twice as high as in air. The air in the insulator coil must therefore be pumped out and replaced by the SF s gas. Furthermore, since the partial discharge and surge voltage resistance in such high-voltage bushing insulators made of wound insulating material films with capacitive potentiometer control are essentially limited by the axial electrical field strength at the outer edges of the electrically conductive potential control inserts, it must be ensured in particular that at least these edges are in the special insulating medium. In the known bushing insulator, however, it is difficult to replace the air with SF s at these points, since the thin metal foils of the potential control inserts are enclosed flatly by the adjacent insulating foils and gas exchange to them is therefore relatively difficult to achieve.

Aus dem eingangs genannten Zusatzpatent FRE-E-44 238 zu dem Hauptpatent FR-A-742 448 ist ferner eine Hochspannungsdurchführung bekannt, deren Isolationskörper aus trapezförmigen Isolierfolien aus Papier gewickelt ist. Diese Isolierfolien können an ihren Kanten mit geprägten Bändern versehen sein. Ausserdem sind in den Isolationskörper Potentialsteuereinlagen mit eingewickelt, die ebenfalls eine Prägung aufweisen.From the above-mentioned additional patent FRE-E-44 238 to the main patent FR-A-742 448 a high-voltage bushing is also known, the insulating body of which is wound from trapezoidal insulating films made of paper. These insulating foils can be provided with embossed bands on their edges. In addition, potential control inserts, which also have an embossing, are also wrapped in the insulation body.

Bei dieser Hochspannungsdurchführung ist zwar eine gute Durchlässigkeit des Isolationskörpers mit einem Isoliermedium gewährleistet. Aufgrund der Verwendung von geprägten Bändern an den Kanten der Isolierfolien hat jedoch der gesamte Isolationskörper nur eine verhältnismässig geringe mechanische Festigkeit, so dass er für Betriebsspannungen von 100 kV und höher nicht geeignet ist.With this high-voltage bushing, good permeability of the insulating body with an insulating medium is guaranteed. However, due to the use of embossed tapes on the edges of the insulating foils, the entire insulating body has only a relatively low mechanical strength, so that it is not suitable for operating voltages of 100 kV and higher.

Aufgabe der Erfindung ist es, diesen bekannten Isolationskörper einer Hochspannungsdurchführung so zu verbessern, dass er auch für Einrichtungen mit hohen Betriebsspannungen zu verwenden ist und zugleich eine ausreichende Tränkung mit einem Isoliermedium, insbesondere an seinen Potentialsteuereinlagen gewährleistet ist.The object of the invention is to improve this known insulation body of a high-voltage bushing so that it can also be used for devices with high operating voltages and at the same time a sufficient impregnation with an insulating medium, in particular on its potential control inserts, is ensured.

Diese Aufgabe wird für die eingangs genannte Hochspannungsdurchführung erfindungsgemäss dadurch gelöst,

  • a) dass die Potentialsteuereinlagen 300 bis 700, vorzugsweise etwa 500 Noppen pro cm2 aufweisen,
  • b) dass die Potentialsteuereinlagen jeweils eine Gesamtdicke haben, die mindestens 50% grösser ist als die Stärke einer entsprechenden Folie ohne Noppung und
  • c) dass die Lagen aus den Isolierfolien zum einen Teil aus glatten Kunststoffolien und zum anderen Teil aus Kunststoffolien mit einer Noppung gewickelt sind, wobei zumindest die den Potentialsteuereinlagen benachbarten Lagen aus den mit der Noppung versehenen Kunststof folien bestehen.
This object is achieved according to the invention for the high-voltage bushing mentioned at the outset by
  • a) that the potential control deposits have 300 to 700, preferably about 500 knobs per cm 2 ,
  • b) that the potential control deposits each have a total thickness which is at least 50% greater than the thickness of a corresponding film without knobs and
  • c) that the layers of the insulating films are partly wound from smooth plastic films and partly from plastic films with a knot, with at least the layers adjacent to the potential control inserts consisting of the knocked-out plastic films.

Mit dieser Gestaltung der Hochspannungsdurchführung lässt sich vorteilhaft zum einen gewährleisten, dass an den Potentialsteuereinlagen beim Wickelvorgang ausgebildete Hohlräume, insbesondere an den Kanten, stets nur mit dem Isoliermedium gefüllt sind, da zwischen den genoppten Steuereinlagen und den jeweils benachbarten Isolierfolien, die ebenfalls geprägt sind, eine ausreichende Gasdurchlässigkeit besteht. Diese Gasdurchlässigkeit ist durch die vorbestimmte Höhe der Noppen gewährleistet. Zum anderen weist der gewickelte Isolationskörper auch eine ausreichende mechanische Festigkeit auf, d.h. ein Verrutschen auf dem zentralen, als Wickeldorn dienenden Leiter bei senkrechter Anordnung der Hochspannungsdurchführung kann vermieden werden. Dies folgt aus der verhältnismässig hohen, vorbestimmten Anzahl der Noppen pro cm2 seiner Potentialsteuereinlagen und aus dem besonderen Aufbau aus mit der Noppung versehenen und glatten Kunststoffolien. Da geprägte Folien im allgemeinen mechanisch verhältnismässig stabil sind, lässt sich der Durchführungsisolator mit solchen genoppten Potentialsteuereinlagen und mit glatten und geprägten Kunststoffolien ohne Schwierigkeiten verhältnismässig fest wikkeln. Dabei ist insbesondere die Gefahr vermindert, dass bei dem Wickelvorgang Knicke in den Potentialsteuereinlagen auftreten, an deren Kanten die elektrische Feldstärke in unerwünschter Weise erhöht wäre.With this design of the high-voltage bushing, it can advantageously be ensured, on the one hand, that cavities formed on the potential control inserts during the winding process, in particular on the edges, are always only filled with the insulating medium, since between the nubbed control inserts and the respectively adjacent insulating foils, which are also embossed, there is sufficient gas permeability. This gas permeability is ensured by the predetermined height of the knobs. On the other hand, the wound insulation body also has sufficient mechanical strength, ie slipping on the central conductor serving as a winding mandrel when the high-voltage bushing is arranged vertically, can be avoided. This follows from the relatively high, predetermined number of knobs per cm 2 of its potential control deposits and from the special structure of smooth plastic films provided with the knobs. Since embossed foils are generally mechanically relatively stable, the bushing insulator can be wound relatively firmly with such nubbed potential control inserts and with smooth and embossed plastic foils without difficulty. In particular, the risk is reduced that kinks occur in the potential control inserts during the winding process, at the edges of which the electric field strength would be undesirably increased.

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. 2 schematically shows a part of this high-voltage bushing designed according to the invention.

Bei der in Fig. 1 als Längsschnitt dargestellten Hochspannungsdurchführung kann beispielsweise von einem Teil des Endverschlusses eines Hochspannungskabels ausgegangen werden, wie es aus der Veröffentlichung «PROC. IEE», Vol. 112, Jan. 1965, Seiten 89 bis 102 bekannt ist. Die Durchführung enthält einen zentralen Leiter 2, der z.B. ein Kupferrohr ist und auf Hochspannungspotential von über 200 kV bei 50 Hz liegt. Vorzugsweise besteht der zentrale Leiter aus einem Edelstahl- oder Aluminiumrohr. Um den Leiter ist konzentrisch ein Isolationskörper 3 angeordnet, der zwei abgeschrägte, kegelmantelförmige Seitenflächen 4 und 5 und dazwischen eine zylinderförmige Mantelfläche 6 hat. Dieser Isolationskörper ist aus isolierenden Folien aus einem Kunststoffmaterial mit einer hohen Dielektrizitätskonstanten, wie z.B. aus Polypropylen-Folien, gewickelt. In ihm sind konzentrisch zueinander und isoliert gegeneinander sogenannte Kondensatoreinlagen 7 bis 10 vorgesehen, die in der Figur durch zu dem zentralen Leiter 2 parallele Linien angedeutet sind. Diese zur Potentialsteuerung dienenden und gemäss der Erfindung besonders gestalteten Kondensatoreinlagen sind zweckmässig 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. Diese 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 deren axiale Längen erreichen (vgl. z.B. US-A-3 462 545). Die innersten, leiternahen und mit 8 und 9 bezeichneten Kondensatoreinlagen liegen z.B. auf Hochspannungspotential, während sich die äusserste Kondensatoreinlage 10 an der Mantel'- fläche 6 mit einem elektrischen Anschluss 11 auf Erdpotential befindet.In the case of the high-voltage bushing shown as a longitudinal section in FIG. 1, it can be assumed, for example, that part of the end closure of a high-voltage cable, as described in the publication “PROC. IEE », vol. 112, Jan. 1965, pages 89 to 102. The bushing contains a central conductor 2, which is, for example, a copper tube and has a high-voltage potential of over 200 kV at 50 Hz. The central conductor preferably consists of a stainless steel or aluminum tube. An insulating body 3 is arranged concentrically around the conductor, which has two beveled, conical jacket-shaped side surfaces 4 and 5 and between them a cylindrical jacket surface 6. This insulating body is wound from insulating foils made of a plastic material with a high dielectric constant, such as polypropylene foils. In it, so-called capacitor inserts 7 to 10 are provided concentrically to one another and isolated from one another, which are indicated in the figure by lines parallel to the central conductor 2. These capacitor inserts, which are used for potential control and are especially designed in accordance with the invention, are expediently arranged in such a way that an approximately linear potential gradient can form from the inside to the outside along the bevelled side surfaces 4 and 5 of the insulation body 3. This 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 (cf. for example US Pat. No. 3,462,545). The innermost conductor near and designated 8 and 9 capacitor deposits are, for example on high-voltage potential, while the outermost capacitor pad 10 on the jacket '- surface 6 is with an electrical terminal 11 at ground potential.

Zur Erhöhung der Spannungsfestigkeit des Isolationskörpers 3 soll die in seinen bei dem Wikkelvorgang ausgebildeten Hohlräumen vorhandene Luft durch ein isolierendes Medium ersetzt sein. Geeignete Medien sind z.B. Gase wie Schwefelhexafluorid (SF6) oder Stickstoff (N2). Gemäss dem Ausführungsbeispiel nach der Figur sei eine SF6-Tränkung des Isolationskörpers angenommen.To increase the dielectric strength of the insulating body 3, the air present in its cavities formed during the winding process should be replaced by an insulating medium. Suitable media include gases such as sulfur hexafluoride (SF 6 ) or nitrogen (N 2 ). According to the exemplary embodiment according to the figure, an SF 6 limitation of the insulation body is assumed.

Falls die Hochspannungsdurchführung für eine auf Tieftemperatur befindliche Einrichtung, beispielsweise für den Endverschluss eines supraleitenden Kabels, vorgesehen sein soll, kann der Isolationskörper auch von einem kryogenen Medium wie z.B. von Helium durchtränkt sein (vgl. DE-A-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 made of a cryogenic medium such as e.g. be impregnated with helium (cf. DE-A-2 327 629).

Es hat sich nun gezeigt, dass bei einem Isolationskörper, der aus glatten Isolierfolien und glatten Potentialsteuereinlagen gewickelt ist, die in dem Wickel eingeschlossene Luft nur schwer durch ein isolierendes Medium wie z.B. SF. zu ersetzen ist. Da bekanntlich die Teilentladungs-und Stossspannungs festigkeit einer Durchführung wesentlich durch die axiale elektrische Feldstärke an den äusseren, d.h. an den den abgeschrägten Seitenflächen 4 und 5 zugewandten Kanten der elektrisch leitenden Potentialsteuereinlagen (Kondensatoreinlagen) 7 bis 10 begrenzt ist, muss gewährleistet sein, dass insbesondere diese Kanten sich in dem isolierenden Medium und nicht in der bei dem Wickelvorgang mit eingeschlossenen Luft befinden. Gemäss der Erfindung ist deshalb eine besondere Gestaltung der Potentialsteuereinlagen vorgesehen. Diese Gestaltung geht aus Fig. 2 näher hervor, in der ein entsprechendes, in Fig. 1 mit 12 bezeichnetes Teilstück des Isolationskörpers vergrössert dargestellt ist. Dabei sind mit Fig. 1 übereinstimmende Teile mit denselben Bezugszeichen versehen.It has now been found that in the case of an insulation body which is wound from smooth insulating foils and smooth potential control inserts, the air enclosed in the winding is difficult to isolate through an insulating medium such as e.g. SF. is to be replaced. As is known, the partial discharge and surge voltage resistance of a bushing depends essentially on the external electrical field strength, i.e. on the edges of the electrically conductive potential control inserts (capacitor inserts) 7 to 10 facing the bevelled side surfaces 4 and 5, it must be ensured that in particular these edges are in the insulating medium and not in the air enclosed during the winding process. According to the invention, a special design of the potential control deposits is therefore provided. This design is shown in more detail in FIG. 2, in which a corresponding section of the insulation body, designated 12 in FIG. 1, is shown enlarged. 1 corresponding parts are provided with the same reference numerals.

Der Isolationskörper 3 einer Hochspannungsdurchführung nach der Erfindung enthält gemäss dem in Fig. 2 als Längsschnitt dargestellten Teilstück 12 dünne Potentialsteuereinlagen, die mit einer Noppung versehen sind und von denen in der Figur nureine einzige, mit 10 bezeichnete Kondensatoreinlage veranschaulicht ist. Die Kondensatorsteuereinlagen können beispielsweise aus einer dünnen Folie aus einem Metall wie z.B. Aluminium hergestellt sein, wie für glatte Folien allgemein aus der GB-A-991 546 bekannt ist. Auch mit einem entsprechenden Metall kaschierte Folien aus einem Kunststoff wie Polyvinylchlorid (PVC), Polyäthylen (PE), Polypropylen (PP) oder Polycarbonat (PC) sind als Potentialsteuereinlagen geeignet. Diese Steuereinlagen enthalten erfindungsgemäss zwischen 300 und 700, vorzugsweise etwa 500 Noppen pro cm2. The insulation body 3 of a high-voltage bushing according to the invention contains, according to the section 12 shown in FIG. 2 as a longitudinal section, thin potential control inserts which are provided with a knot and of which only one capacitor insert, designated 10, is illustrated in the figure. The capacitor control inserts can be made, for example, from a thin foil made of a metal such as aluminum, as is generally known from GB-A-991 546 for smooth foils. Films made of a plastic such as polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP) or polycarbonate (PC) are also suitable as potential control deposits. According to the invention, these tax deposits contain between 300 and 700, preferably about 500 knobs per cm 2.

Mit der Noppung sollen die Steuereinlagen jeweils eine Gesamtdicke erhalten, die mindestens 50% grösser als die Stärke einer entsprechenden Folie ohne Noppung ist. So kann z.B. eine 18 11m starke Aluminium-Folie verwendet werden, die mit der Noppung eine Gesamtdicke von etwa 40 µm aufweist. Mit einer solchen genoppten Folie lässt sich wesentlich besser beim Wickeln des Isolationskörpers 3 hantieren als mit einer glatten Folie, da die genoppte Folie mechanisch stabiler ist. Der Isolationskörper ist ferner aus glatten Isolationsfolien 14 gewickelt, die beispielsweise aus Polypropylen oder Polyäthylen sind. Zwischen jeweils zwei Lagen aus glatten Isolationsfolien 14 befindet sich ferner eine Lage aus geprägten Isolationsfolien 15. Diese Folien sind ebenfalls mit einer Noppung versehen, wobei sie beispielsweise etwa 500 Noppen/cm2 enthalten. Vorteilhaft sind jeweils zu den beiden Seiten der Potentialsteuereinlage Kondensatoreinlage 10 deraritge geprägte Isolationsfolien 15 vorgesehen. Auf diese Weise wird eine ausreichende Durchlässigkeit des Isolationskörpers 3 für das isolierende Medium wie z.B. das SFs-Gas gewährleistet. Insbesondere sind dann die durch die Noppung der Potentialsteuereinlage (Kondensatoreinlage 10) und der benachbarten Isolationsfolien 15 ausgebildeten Hohlräume, von denen in der Figur einige mit 16 bezeichnet sind, nach dem Wickelvorgang des Isolationskörpers verhältnismässig leicht zu evakuieren und mit dem Isoliermedium zu füllen. In den Figuren ist angenommen, dass der auf Hochspannungspotential liegende Leiterteil der Hochspannungsdurchführung zentral angeordnet ist und die auf Erdpotential liegenden Leiterteile ihn umgeben, wobei zwischen diesen Leiterteilen der Isolationskörper vorgesehen ist. Die Hochspannungsdurchführung nach der Erfindung ist jedoch ebensogut auch für elektrische Einrichtungen geeignet, bei denen auf der Aussenseite Hochspannungspotential und innen Erdpotential anliegen.With the knobs, the tax deposits should each have a total thickness that is at least 50% greater than the thickness of a corresponding one Foil without knobs. For example, an 18 1 1m aluminum foil can be used, which has a total thickness of about 40 µm with the knobs. It is much easier to handle such a nubbed film when winding the insulating body 3 than with a smooth film, since the nubbed film is mechanically more stable. The insulating body is also wound from smooth insulating foils 14, which are made of polypropylene or polyethylene, for example. Between each two layers of smooth insulation foils 14 there is also a layer of embossed insulation foils 15. These foils are also provided with a knot, for example containing about 500 knobs / cm 2 . Advantageously, insulating sheets 15 of the same type are provided on both sides of the potential control insert, capacitor insert 10. In this way, sufficient permeability of the insulating body 3 for the insulating medium such as the SF s gas is ensured. In particular, the cavities formed by the nubbing of the potential control insert (capacitor insert 10) and the adjacent insulation foils 15, some of which are denoted by 16 in the figure, are relatively easy to evacuate after the winding process of the insulation body and to fill them with the insulating medium. In the figures it is assumed that the conductor part of the high-voltage bushing which is at high voltage potential is arranged centrally and that the conductor parts which are at earth potential surround it, the insulation body being provided between these conductor parts. 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. A high-voltage bushing having conductor portions which lie at different electrical potentials and an insulating body (3) which is arranged between the conductor portions and which is wound from insulating films (14) and contains thin electrically-conductive foils having a knobbed structure which are provided as potential control inserts (7 to 10) and which body is impregnated with a gaseous insulating medium, characterized in that
(a) the potential control inserts (7 to 10) have 300 to 700, preferably 500, small knobs per square centimetre;
(b) the potential control inserts (7 to 10) in each case have an overall thickness which is greater by at least 50% than the thickness of a corresponding foil without a knobbed structure, and
(c) the layers consisting of the insulating films (14) are wound from smooth plastic films, on the one hand, and from plastic films (15) having a knobbed structure, on the other hand, at least the layers adjacent to the potential control inserts (7 to 10) consisting of the plastic films (15) which are provided with the knobbed structure.
2. A high-voltage bushing as claimed in claim 1, characterized in that embossed aluminium foils are provided as potential control inserts (7 to 10).
3. A high-voltage bushing as claimed in claim 1 or 2, characterized in that appropriately embossed double-layer foils, each having a layer of electically-conductive material and a layer of an insulating material, are provided as potential control inserts (7 to 10).
4. A high-voltage bushing as claimed in claim 3, characterized in that films made of a plastic material and covered with aluminium are provided as the double-layer foils.
EP81100119A 1980-01-18 1981-01-09 Foil-insulated high-tension feed-through comprising voltage-control insertions Expired EP0032690B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81100119T ATE5034T1 (en) 1980-01-18 1981-01-09 FILM INSULATED HIGH VOLTAGE BUSHING WITH POTENTIAL CONTROL INSERTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803001810 DE3001810A1 (en) 1980-01-18 1980-01-18 FILM-INSULATED HIGH VOLTAGE TRANSMISSION WITH POTENTIAL CONTROL INSERTS
DE3001810 1980-01-18

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EP0032690A2 EP0032690A2 (en) 1981-07-29
EP0032690A3 EP0032690A3 (en) 1981-11-11
EP0032690B1 true EP0032690B1 (en) 1983-10-12

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EP (1) EP0032690B1 (en)
AT (1) ATE5034T1 (en)
DE (1) DE3001810A1 (en)

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US5968210A (en) * 1997-11-12 1999-10-19 Pacesetter, Inc. Electrolytic capacitor and method of manufacture
DE19856123C2 (en) 1998-12-04 2000-12-07 Siemens Ag Hollow insulator
DE10048838B4 (en) * 2000-09-30 2008-09-18 Abb Ag Capacitive control of at least one vacuum switching chamber
US6951987B1 (en) 2003-01-31 2005-10-04 United States Of America As Represented By The Secretary Of The Navy High voltage bushing
EP1939897A1 (en) * 2006-12-28 2008-07-02 ABB Research Ltd. An insulating structure with screens shaping an electric field
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EP2431982B1 (en) * 2010-09-21 2014-11-26 ABB Technology AG Plugable feedthrough and high voltage assembly with such a feedthrough
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KR101720237B1 (en) * 2015-05-26 2017-04-10 주식회사 효성 Bushing for condenser and making method of the same
US11146053B2 (en) * 2016-01-29 2021-10-12 Power Hv Inc. Bushing for a transformer
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
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Also Published As

Publication number Publication date
ATE5034T1 (en) 1983-10-15
EP0032690A2 (en) 1981-07-29
DE3001810A1 (en) 1981-07-23
US4387266A (en) 1983-06-07
EP0032690A3 (en) 1981-11-11

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