EP0032687B1 - High-tension feed-through with layers of imprinted insulating foils - Google Patents

High-tension feed-through with layers of imprinted insulating foils Download PDF

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Publication number
EP0032687B1
EP0032687B1 EP81100116A EP81100116A EP0032687B1 EP 0032687 B1 EP0032687 B1 EP 0032687B1 EP 81100116 A EP81100116 A EP 81100116A EP 81100116 A EP81100116 A EP 81100116A EP 0032687 B1 EP0032687 B1 EP 0032687B1
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EP
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Prior art keywords
embossed
high voltage
insulating
wound
layers
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EP81100116A
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German (de)
French (fr)
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EP0032687A3 (en
EP0032687A2 (en
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Günther Matthäus
Joachim Dr. Ruffer
Andreas Diller
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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 at different electrical potentials and with a wound insulation body arranged between these conductor parts, which contains layers of embossed insulating foils made of a plastic material that shrinks above a predetermined temperature and electrically conductive potential control inserts, and is impregnated with a special insulating medium.
  • a high-voltage bushing is known from the publication “Third International Symposium on High Voltage Engineering”, Milan (Italy), August 28-31, 1979, report 32.09.
  • 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 which are at ground potential in such a way that arcing between these parts is 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.
  • the bushing insulator of a cable end closure known from the publication “Third International Symposium on High Voltage Engineering” is wound from flexible polypropylene films.
  • so-called electrically conductive potential control systems are wound concentrically to one another and insulated from one another in this bushing insulator.
  • Gaps and cavities in the known winding should be filled with sulfur hexafluoride (SF e ) as the insulating medium, since it is known that the partial discharge field strength in SF 6 is at least twice as high as in air. The air in the winding must therefore be pumped out and replaced by SF e .
  • the known winding is not constructed from smooth, but from nubbed polypropylene films. Because of the knot, the gaps and cavities present in the winding are practically interconnected and can thus be more easily evacuated and then filled with the insulating medium.
  • embossed foils used for the known winding are only available with a relatively small width of, for example, 1 m, feedthroughs that are longer than this width, such as. B. in 420 kV bushings with a length of about 3 m, several webs of these foils are provided, which must be wound offset from one another.
  • the corresponding winding technology is accordingly complex.
  • the object of the present invention is to improve the wound insulation body of the known high-voltage bushing in such a way that its winding package has sufficient mechanical strength up to the generally occurring maximum operating temperatures of about 120 ° C and in particular cannot loosen and possibly even slip, if that High-voltage bushing is arranged vertically.
  • a certain shrinkage of these foils is anticipated by the thermal pretreatment of the embossed foils before the insulation body is wound.
  • the advantages achieved in this way are, in particular, that the winding produced scarcely shrinks under operating conditions up to the temperature selected for the thermal pretreatment, and a sufficiently high mechanical strength is thus achieved. Since the original embossing of the film is not completely eliminated during the thermal pretreatment, but largely remains, the insulation body wound with these films is relatively easy to evacuate and for an insulating medium, such as, for. B. SFg, sufficiently permeable.
  • FIG. 1 schematically illustrates a high-voltage bushing.
  • 2 schematically shows a part of this high-voltage bushing designed according to the invention.
  • a longitudinal section z. B. from a part of the end closure of a high-voltage cable, as is known from the publication "Third International Symposium on High Voltage Engineering", Milan, Italy, 28th-31st August 1979, report 32.09.
  • the implementation contains a central conductor 2, the z. B. is a steel or aluminum tube 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 lateral surfaces 4 and 5 and a cylindrical lateral surface 6 in between. This insulation body is wound from insulating films made of a predetermined plastic material.
  • capacitor inserts 7 to 10 are arranged concentrically to one another and isolated from one another, which are indicated in the figure by lines parallel to the axis.
  • These capacitor inserts which serve for potential control, are expediently arranged in such a way that an approximately linear potential gradient can form from inside to outside along the bevelled side surfaces 4 and 5 of the insulating body 3.
  • 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 (cf. US-A-3462545).
  • the innermost near the conductor and designated 8 and 9 capacitor deposits are z. B. at high voltage potential, while the outermost capacitor insert 10 is on the outer surface 6 with an electrical connection 11 to ground potential.
  • Suitable media are e.g. B. special oils or in particular gases such as SF 6 or N 2 . According to the exemplary embodiment according to the figure, an SF 6 impregnation of the insulation body is assumed (cf. SIGRE 1972, Paper N ° 15-02).
  • the insulation body can also be covered by a cryogenic medium such as, for. B. be impregnated with helium (see. DE-A-2 327 629).
  • the insulation body 3 is at least partially wound from embossed plastic films.
  • the corresponding design of the insulation body 3 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.
  • the insulation body 3 of a high-voltage bushing according to the invention contains, among other things, several wound layers of smooth insulation foils, some of which are denoted by 14 in the figure.
  • Polypropylene or polyethylene for example, is suitable as the film material. Since such foils are to be produced with a width corresponding to the length of the bushing insulator, these layers can expediently be wound from a single foil in order to avoid bumps or overlaps within one layer.
  • each two layers of the smooth insulation foils 14 there is a layer of embossed insulation foils, some of which are denoted by 15 in the figure.
  • These foils are provided with a knot, they contain between 300 and 700, preferably about 500 knobs / cm 2 . According to the representation according to the figure, it is assumed that all the knobs of the insulating films 15 in the section 12 shown are detected with the longitudinal section.
  • the insulation films 15 consist of a plastic material such as. B. polypropylene, which shows signs of shrinkage above a predetermined temperature, which is exceeded in the operating case of the insulating body.
  • embossed foils can e.g. B. be prepared by starting from a 40 j.Lm thick polypropylene film, which is provided in a calender at temperatures between about 120 and 150 ° C to 60 to 80 j.Lm total thickness with the knobs.
  • the shrinkage of these knobs which can already be observed at temperatures above 80 ° C., is at least largely anticipated according to the invention by thermal pretreatment at temperatures between 80 and 125 ° C., preferably between 100 and 120 ° C., before winding.
  • the pretreatment temperature is chosen so that it is close to the in Operating case of the high-voltage bushing lies in the insulation body 3 at the maximum temperature.
  • a pretreatment temperature is preferably provided, which corresponds approximately to the maximum temperature occurring in the insulation body 3 during operation of the high-voltage bushing.
  • the shrinkage of the knobs achieved in this way should not exceed half the difference in thickness between the total thickness of the embossed but thermally untreated films and the thickness of a corresponding film without embossing. With these measures it is achieved that the winding hardly shrinks up to this temperature and so a mechanical strength is sufficiently high.
  • the total thickness of the embossed foils after the thermal shrinkage treatment should be at least 20% greater than the thickness of a corresponding foil without embossing, sufficient permeability of the insulating body 3 for the insulating medium, such as, for. B. for the SF e gas guaranteed.
  • the cavities formed by the knobs of the foils 15 and designated 16 in the figure are then filled with the insulating medium.
  • embossed insulation foils 15 are only available with a relatively small width of, for example, 1 m, in the case of insulation bodies which are longer than 1 m, several webs are required which are expediently wound in a mutually offset manner.
  • the embossed foils of a layer can advantageously be wound together. Such a winding can be carried out without any particular technical difficulties.
  • some corresponding joints are indicated and designated 17.
  • a capacitor control insert designated by 10 can also be seen.
  • This capacitor control insert can for example be a thin foil made of a metal, such as. B. aluminum. Films made of a plastic such as polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP) or polycarbonate (PC) are also suitable as potential control deposits.
  • PVC polyvinyl chloride
  • PE polyethylene
  • PP polypropylene
  • PC polycarbonate
  • 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)
  • Insulating Bodies (AREA)
  • Insulators (AREA)

Abstract

A high voltage insulator bushing is formed of wound insulating foils and is provided with conductive parts which are at different electric potentials and with a wound insulator body arranged between the conductive parts. The wound insulator body contains layers of an embossed insulating foil which consists of a plastic material which shrinks above a predetermined temperature. The embossed insulating foil is subjected to a thermal shrinking treatment prior to being wound as part of the insulator body. Such preshrinking prevents further shrinkage which would occur when the high voltage bushing is operated. Smooth insulating foil may be wound as part of the insulator body so as to be interposed between the layers of the embossed insulating foil. The gaps and voids which are formed between the layers of insulating foils caused by the irregular surface of the embossed insulating foil are filled with an insulating medium.

Description

Die Erfindung bezieht sich auf eine Hochspannungsdurchführung mit auf unterschiedlichem elektrischen Potential liegenden Leiterteilen sowie mit einem zwischen diesen Leiterteilen angeordneten gewickelten Isolationskörper, der Lagen aus geprägten Isolierfolien aus einem oberhalb einer vorbestimmten Temperatur schrumpfenden Kunststoffmaterial und elektrisch leitende Potentialsteuereinlagen enthält sowie von einem besonderen Isoliermedium getränkt ist. Eine derartige Hochspannungsdurchführung ist aus der Veröffentlichung « Third International Symposium on High Voltage Engineering », Mailand (Italien), 28.-31.8.1979, Bericht 32.09 bekannt.The invention relates to a high-voltage bushing with conductor parts at different electrical potentials and with a wound insulation body arranged between these conductor parts, which contains layers of embossed insulating foils made of a plastic material that shrinks above a predetermined temperature and electrically conductive potential control inserts, and is impregnated with a special insulating medium. Such a high-voltage bushing is known from the publication “Third International Symposium on High Voltage Engineering”, Milan (Italy), August 28-31, 1979, report 32.09.

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 which are at ground potential in such a way that arcing between these parts is 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.

Der aus der genannten Veröffentlichung « Third International Symposium on High Voltage Engineering bekannte Durchführungsisolator eines Kabelendverschlusses ist aus flexiblen Polypropylen-Folien gewickelt. Außerdem sind in diesen Durchführungsisolator sogenannte elektrisch leitende Potentialsteueranlagen 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 of a cable end closure known from the publication “Third International Symposium on High Voltage Engineering” is wound from flexible polypropylene films. In addition, so-called electrically conductive potential control systems are wound concentrically to one another and insulated from one another in this bushing insulator. With these inserts, a control of the voltage distribution via the bushing insulator and thus an increase in the resistance to partial discharge and surge voltage can be achieved (see, e.g., P. Böning: Little Textbook of Electrical Strength, Karlsruhe, 1955, pages 140 to 142).

In dem bekannten Wickel vorhandene Spalte und Hohlräume sollen mit Schwefelhexafluorid (SFe) als Isoliermedium gefüllt sein, da bekanntlich die Teilentladungs-Einsatzfeldstärke in SF6 mindestens doppelt so hoch ist wie in Luft. Die in dem Wickel vorhandene Luft muß deshalb abgepumpt und durch SFe ersetzt werden. Um dies zu ermöglichen bzw. zumindest zu erleichtern, ist der bekannte Wickel nicht aus glatten, sondern aus genoppten Polypropylen-Folien aufgebaut. Aufgrund der Noppung sind nämlich die in dem Wickel vorhandenen Spalte und Hohlräume praktisch untereinander verbunden und können so leichter evakuiert und dann mit dem Isoliermedium gefüllt werden.Gaps and cavities in the known winding should be filled with sulfur hexafluoride (SF e ) as the insulating medium, since it is known that the partial discharge field strength in SF 6 is at least twice as high as in air. The air in the winding must therefore be pumped out and replaced by SF e . In order to make this possible or at least to make it easier, the known winding is not constructed from smooth, but from nubbed polypropylene films. Because of the knot, the gaps and cavities present in the winding are practically interconnected and can thus be more easily evacuated and then filled with the insulating medium.

Wird ein solcher fertig gewickelter Isolationskörper jedoch Temperaturen von oberhalb 80 °C ausgesetzt, die auch im ungestörten Betriebsfall auftreten können, so besteht die Gefahr, daß sein Wickel locker wird und dann keine ausreichende mechanische Festigkeit mehr aufweist. Dies ist darauf zurückzuführen, daß die Noppen des Folienmaterials oberhalb dieser Temperatur schrumpfen. Da sich bei der Schrumpfung der Durchmesser des Wickels verringert, können außerdem in den in ihn eingelegten Potentialsteuereinlagen Knicke auftreten, an deren Kanten dann die elektrische Feldstärke in unerwünschter Weise erhöht ist.However, if such a fully wound insulation body is exposed to temperatures above 80 ° C., which can also occur in undisturbed operation, there is a risk that its winding will become loose and then no longer have sufficient mechanical strength. This is due to the fact that the nubs of the film material shrink above this temperature. Since the diameter of the winding decreases during the shrinkage, kinks can also occur in the potential control inserts inserted into it, at the edges of which the electric field strength is then undesirably increased.

Da ferner die für den bekannten Wickel verwendeten geprägten Folien nur mit einer verhältnismäßig geringen Breite von beispielsweise 1 m erhältlich sind, müssen bei Durchführungen, die länger als diese Breite sind, wie z. B. bei 420 kV-Durchführungen mit einer Länge von etwa 3 m, mehrere Bahnen dieser Folien vorgesehen werden, die gegeneinander versetzt gewickelt werden müssen. Die entsprechende Wickeltechnik ist dementsprechend aufwendig.Furthermore, since the embossed foils used for the known winding are only available with a relatively small width of, for example, 1 m, feedthroughs that are longer than this width, such as. B. in 420 kV bushings with a length of about 3 m, several webs of these foils are provided, which must be wound offset from one another. The corresponding winding technology is accordingly complex.

Aufgabe der vorliegenden Erfindung ist es, den gewickelten Isolationskörper der bekannten Hochspannungsdurchführung dahingehend zu verbessern, daß sein Wickelpaket eine ausreichende mechanische Festigkeit bis zu den allgemein auftretenden maximalen Betriebstemperaturen von etwa 120°C aufweist und sich insbesondere nicht lockern und gegebenenfalls sogar verrutschen kann, falls die Hochspannungsdurchführung vertikal angeordnet wird.The object of the present invention is to improve the wound insulation body of the known high-voltage bushing in such a way that its winding package has sufficient mechanical strength up to the generally occurring maximum operating temperatures of about 120 ° C and in particular cannot loosen and possibly even slip, if that High-voltage bushing is arranged vertically.

Diese Aufgabe wird für eine Hochspannungsdurchführung der eingangs genannten Art erfindungsgemäß dadurch gelöst, daß geprägte Isolierfolien vorgesehen sind, die vor dem Wickelvorgang einer thermischen Schrumpfungsbehandlung unterzogen worden sind.This object is achieved according to the invention for a high-voltage bushing of the type mentioned at the outset in that embossed insulating foils are provided which have been subjected to a thermal shrinkage treatment before the winding process.

Durch die thermische Vorbehandlung der geprägten Folien vor dem Wickeln des Isolationskörpers wird eine gewisse Schrumpfung dieser Folien vorweggenommen. Die damit erreichten Vorteile bestehen insbesondere darin, daß der hergestellte Wickel unter Betriebsbedingungen bis zu der bei der thermischen Vorbehandlung gewählten Temperatur kaum noch schrumpft und so eine ausreichend große mechanische Festigkeit erreicht wird. Da bei der thermischen Vorbehandlung die ursprüngliche Prägung der Folie nicht vollständig beseitigt wird, sondern großenteils erhalten bleibt, ist der mit diesen Folien gewickelte Isolationskörper verhältnismäßig leicht evakuierbar und für ein Isoliermedium, wie z. B. SFg, ausreichend durchlässig.A certain shrinkage of these foils is anticipated by the thermal pretreatment of the embossed foils before the insulation body is wound. The advantages achieved in this way are, in particular, that the winding produced scarcely shrinks under operating conditions up to the temperature selected for the thermal pretreatment, and a sufficiently high mechanical strength is thus achieved. Since the original embossing of the film is not completely eliminated during the thermal pretreatment, but largely remains, the insulation body wound with these films is relatively easy to evacuate and for an insulating medium, such as, for. B. SFg, sufficiently permeable.

Besonders vorteilhaft ist es darüber hinaus, wenn zwischen den Lagen aus geprägten Isolierfolien jeweils mindestens eine Lage aus glatten Isolierfolien vorgesehen ist. Mit den glatten Folien, die in wesentlich größerer Breite als die geprägten Folien hergestellt werden, läßt sich so eine weitere Erhöhung der mechanischen Festigkeit des Wickels in Längsrichtung erreichen. Da außerdem beispielsweise nur jede zweite Lage mit geprägten Folien gewickelt wird, ist die prozentuale Schrumpfung des Wickelvolumens geringer als wenn ausschließlich nur geprägte Folien wie bei der bekannten Hochspannungsdurchführung verwendet werden. Die Evakuierbarkeit bzw. Durchlässigkeit für ein Isoliermedium ist dennoch ausreichend.It is also particularly advantageous if there is at least one layer between the layers of embossed insulating films smooth insulating films is provided. With the smooth foils, which are produced in a much greater width than the embossed foils, a further increase in the mechanical strength of the winding in the longitudinal direction can be achieved. In addition, since, for example, only every second layer is wound with embossed foils, the percentage shrinkage of the winding volume is less than when only embossed foils are used, as in the known high-voltage bushing. Evacuability or permeability for an insulating medium is nevertheless sufficient.

Weitere vorteilhafte Ausgestaltungen der Hochspannungsdurchführung nach der Erfindung gehen aus den restlichen abhängigen Ansprüchen hervor.Further advantageous refinements of the high-voltage bushing according to the invention emerge from the remaining dependent claims.

Zur weiteren Erläuterung der Erfindung und deren in den abhängigen Ansprüchen 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 dependent claims, 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 z. B. von einem Teil des Endverschlusses eines Hochspannungskabels ausgegangen sein, wie er aus der Veröffentlichung « Third International Symposium on High Voltage Engineering », Mailand, Italien, 28.-31.8.1979, Bericht 32.09 bekannt ist. Die Durchführung enthält einen zentralen Leiter 2, der z. B. ein Stahl- oder Aluminiumrohr ist und auf Hochspannungspotential, beispielsweise 200 kV bei 50 Hz, liegt. Um den Leiter ist konzentrisch ein Isolationskörper 3 angeordnet, der zwei abgeschrägte kegelmantelförmige Seitenflächen 4 und 5 und dazwischen eine zylinderförmige Mantelfläche 6 aufweist. Dieser Isolationskörper ist aus isolierenden Folien aus einem vorbestimmten Kunststoffmaterial gewickelt. In ihm sind konzentrisch zueinander und isoliert gegeneinander sogenannte Kondensatoreinlagen 7 bis 10 angeordnet, die in der Figur durch achsenparallele Linien angedeutet sind. Diese zur Potentialsteuerung dienenden 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. 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. US-A-3462545). Die innersten leiternahen und mit 8 und 9 bezeichneten Kondensatoreinlagen liegen z. B. auf Hochspannungspotential, während sich die äußerste Kondensatoreinlage 10 an der Mantelfläche 6 mit einem elektrischen Anschluß 11 auf Erdpotential befindet.In the high-voltage bushing shown in Fig. 1 as a longitudinal section z. B. from a part of the end closure of a high-voltage cable, as is known from the publication "Third International Symposium on High Voltage Engineering", Milan, Italy, 28th-31st August 1979, report 32.09. The implementation contains a central conductor 2, the z. B. is a steel or aluminum tube 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 lateral surfaces 4 and 5 and a cylindrical lateral surface 6 in between. This insulation body is wound from insulating films made of a predetermined plastic material. In it, so-called capacitor inserts 7 to 10 are arranged concentrically to one another and isolated from one another, which are indicated in the figure by lines parallel to the axis. These capacitor inserts, which serve for potential control, are expediently arranged in such a way that an approximately linear potential gradient can form from inside to outside along the bevelled side surfaces 4 and 5 of the insulating body 3. 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 (cf. US-A-3462545). The innermost near the conductor and designated 8 and 9 capacitor deposits are z. B. at high voltage potential, while the outermost capacitor insert 10 is on the outer surface 6 with an electrical connection 11 to ground potential.

Zur Erhöhung der Spannungsfestigkeit des Isolationskörpers 3 ist dieser von einem isolierenden Medium durchtränkt. Geeignete Medien sind z. B. spezielle Öle oder insbesondere Gase wie SF6 oder N2. Gemäß dem Ausführungsbeispiel nach der Figur sei eine SF6 Tränkung des Isolationskörpers angenommen (vgl. SIGRE 1972, Paper N° 15-02).To increase the dielectric strength of the insulation body 3, it is impregnated with an insulating medium. Suitable media are e.g. B. special oils or in particular gases such as SF 6 or N 2 . According to the exemplary embodiment according to the figure, an SF 6 impregnation of the insulation body is assumed (cf. SIGRE 1972, Paper N ° 15-02).

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 for a device located at low temperature, for example for the end closure of a superconducting cable, is to be provided, the insulation body can also be covered by a cryogenic medium such as, for. B. be impregnated with helium (see. DE-A-2 327 629).

Gemäß der Erfindung ist der Isolationskörper 3 zumindest teilweise aus geprägten Kunststoffolien gewickelt. Die entsprechende Gestaltung des Isolationskörpers 3 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.According to the invention, the insulation body 3 is at least partially wound from embossed plastic films. The corresponding design of the insulation body 3 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 unter anderem mehrere gewickelte Lagen aus glatten Isolationsfolien, von denen einige in der Figur mit 14 bezeichnet sind. Als Folienmaterial ist beispielsweise Polypropylen oder Polyäthylen geeignet. Da solche Folien mit einer der Länge des Durchführungsisolators entsprechenden Breite herzustellen sind, können diese Lagen zweckmäßig aus nur einer einzigen Folie gewickelt werden, um so Stöße oder Überlappungen innerhalb einer Lage zu vermeiden.The insulation body 3 of a high-voltage bushing according to the invention, according to the section 12 shown in FIG. 2 as a longitudinal section, contains, among other things, several wound layers of smooth insulation foils, some of which are denoted by 14 in the figure. Polypropylene or polyethylene, for example, is suitable as the film material. Since such foils are to be produced with a width corresponding to the length of the bushing insulator, these layers can expediently be wound from a single foil in order to avoid bumps or overlaps within one layer.

Zwischen jeweils zwei Lagen aus den glatten Isolationsfolien 14 befindet sich eine Lage aus geprägten Isolationsfolien, von denen in der Figur einige mit 15 bezeichnet sind. Diese Folien sind mit einer Noppung versehen, wobei sie zwischen 300 und 700, vorzugsweise etwa 500 Noppen/cm2 enthalten. Gemäß der Darstellung nach der Figur sei angenommen, daß mit dem Längsschnitt gerade alle Noppen der Isolationsfolien 15 in dem gezeigten Teilstück 12 erfaßt werden.Between each two layers of the smooth insulation foils 14 there is a layer of embossed insulation foils, some of which are denoted by 15 in the figure. These foils are provided with a knot, they contain between 300 and 700, preferably about 500 knobs / cm 2 . According to the representation according to the figure, it is assumed that all the knobs of the insulating films 15 in the section 12 shown are detected with the longitudinal section.

Die Isolationsfolien 15 bestehen aus einem Kunststoffmaterial wie z. B. Polypropylen, das oberhalb einer vorbestimmten Temperatur, die im Betriebsfall des Isolationskörpers überschritten wird, Schrumpfungserscheinungen zeigt. Derartige geprägte Folien können z. B. dadurch hergestellt werden, daß man von einer 40 j.Lm dicken Polypropylen-Folie ausgeht, die in einem Kalander bei Temperaturen zwischen etwa 120 und 150 °C bis auf 60 bis 80 j.Lm Gesamtdicke mit der Noppung versehen wird. Die bereits bei Temperaturen oberhalb von 80 °C zu beobachtende Schrumpfung dieser Noppen wird gemäß der Erfindung durch eine thermische Vorbehandlung bei Temperaturen zwischen 80 und 125 °C, vorzugsweise zwischen 100 und 120 °C, vor dem Wickeln zumindest großenteils vorweggenommen. Die Vorbehandlungstemperatur ist dabei so gewählt, daß sie in der Nähe der im Betriebsfall der Hochspannungsdurchführung sich in dem Isolationskörper 3 einstellenden maximalen Temperatur liegt. Vorzugsweise wird eine Vorbehandlungstemperatur vorgesehen, welche etwa der im Betriebsfall der Hochspannungsdurchführung in ihrem Isolationskörper 3 auftretenden maximalen Temperatur entspricht. Die damit erreichte Schrumpfung der Noppen soll höchstens die Hälfte des Dickenunterschiedes zwischen der Gesamtdicke der geprägten, thermisch jedoch noch unbehandelten Folien und der Stärke einer entsprechenden Folie ohne Prägung betragen. Mit diesen Maßnahmen erreicht man, daß der Wickel bis zu dieser Temperatur kaum noch schrumpft und so eine mechanische Festigkeit ausreichend hoch ist. Da außerdem die Gesamtdicke der geprägten Folien nach der thermischen Schrumpfungsbehandlung jeweils mindestens 20 % größer als die Stärke einer entsprechenden Folie ohne Prägung sein soll, ist eine ausreichende Durchlässigkeit des Isolationskörpers 3 für das isolierende Medium, wie z. B. für das SFe-Gas, gewährleistet. Die durch die Noppung der Folien 15 ausgebildeten und in der Figur mit 16 bezeichneten Hohlräume sind dann mit dem isolierenden Medium gefüllt.The insulation films 15 consist of a plastic material such as. B. polypropylene, which shows signs of shrinkage above a predetermined temperature, which is exceeded in the operating case of the insulating body. Such embossed foils can e.g. B. be prepared by starting from a 40 j.Lm thick polypropylene film, which is provided in a calender at temperatures between about 120 and 150 ° C to 60 to 80 j.Lm total thickness with the knobs. The shrinkage of these knobs, which can already be observed at temperatures above 80 ° C., is at least largely anticipated according to the invention by thermal pretreatment at temperatures between 80 and 125 ° C., preferably between 100 and 120 ° C., before winding. The pretreatment temperature is chosen so that it is close to the in Operating case of the high-voltage bushing lies in the insulation body 3 at the maximum temperature. A pretreatment temperature is preferably provided, which corresponds approximately to the maximum temperature occurring in the insulation body 3 during operation of the high-voltage bushing. The shrinkage of the knobs achieved in this way should not exceed half the difference in thickness between the total thickness of the embossed but thermally untreated films and the thickness of a corresponding film without embossing. With these measures it is achieved that the winding hardly shrinks up to this temperature and so a mechanical strength is sufficiently high. In addition, since the total thickness of the embossed foils after the thermal shrinkage treatment should be at least 20% greater than the thickness of a corresponding foil without embossing, sufficient permeability of the insulating body 3 for the insulating medium, such as, for. B. for the SF e gas guaranteed. The cavities formed by the knobs of the foils 15 and designated 16 in the figure are then filled with the insulating medium.

Da diese geprägten Isolationsfolien 15 nur mit einer verhältnismäßig geringen Breite von beispielsweise 1 m erhältlich sind, werden bei Isolationskörpern, die länger als 1 m sind, mehrere Bahnen erforderlich, die zweckmäßig gegeneinander versetzt gewickelt werden. Hierbei können vorteilhaft die geprägten Folien einer Lage auf Stoß gewickelt sein. Eine solche Wicklung ist ohne besondere technische Schwierigkeiten durchführbar. In der Figur sind einige entsprechende Stoßstellen angedeutet und mit 17 bezeichnet.Since these embossed insulation foils 15 are only available with a relatively small width of, for example, 1 m, in the case of insulation bodies which are longer than 1 m, several webs are required which are expediently wound in a mutually offset manner. In this case, the embossed foils of a layer can advantageously be wound together. Such a winding can be carried out without any particular technical difficulties. In the figure, some corresponding joints are indicated and designated 17.

Aus Fig. 2 ist ferner eine mit 10 bezeichnete Kondensatorsteuereinlage ersichtlich. Diese Kondensatorsteuereinlage kann beispielsweise eine dünne Folie aus einem Metall, wie z. B. Aluminium, sein. Auch mit einem entsprechenden Metall kaschierte Folien aus einem Kunststoff wie Polyvinylchlorid (PVC), Polyäthylen (PE), Polypropylen (PP) oder Polycarbonat (PC) sind als Potentialsteuereinlagen geeignet.From FIG. 2, a capacitor control insert designated by 10 can also be seen. This capacitor control insert can for example be a thin foil made of a metal, such as. B. aluminum. Films made of a plastic such as polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP) or polycarbonate (PC) are also suitable as potential control deposits.

Gemäß dem Ausführungsbeispiel nach den Figuren ist davon ausgegangen, daß ein auf Hochspannungspotential liegender elektrischer Leiter zentral angeordnet und von ihn umgebenden, auf Erdpotential liegenden Leiterteilen durch den Isolationskörper nach der Erfindung getrennt 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 separated from surrounding conductor parts which are at ground potential by the insulation body according to the invention. 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 (8)

1. A high voltage duct comprising conductive elements which are at different electric potentials and a wound insulating body (3) which is arranged between these conductive elements and which includes layers of embossed insulating films (15) made of a synthetic resin material which shrinks above a predetermined temperature and electrically conductive potential control inserts (7 to 10), and is impregnated with a specific insulating medium, characterised by embossed insulating films (15) which have been subjected to a thermal shrinkage treatment prior to the winding operation.
2. A high voltage duct according to Claim 1, characterised in that at least one layer of smooth insulating film (14) is in each case arranged between the layers of embossed insulating films (15).
3. A high voltage duct according to Claim 1 or Claim 2, characterised by the shrinkage of each embossed insulating film (15) by a maximum of half the difference in thickness between the overall thickness of the embossed film which has not been thermally treated and the thickness of a corresponding unembossed film.
4. A high voltage duct according to one of Claims 1 to 3, characterised by embossed insulating films (15) of polypropylene, having 300 to 700, and preferably about 500, bosses/cm2.
5. A high voltage duct according to one of Claims 1 to 4, characterised by a thermal shrinkage treatment carried out at a temperature which at least approximates to the maximum temperature which occurs in the insulating body (3) of the high voltage duct during operation thereof.
6. A high voltage duct according to Claim 5, characterised by a thermal shrinkage treatment carried out at a temperature of above 80 °C, preferably above 100 °C.
7. A high voltage duct according to Claim 5 or Claim 6, characterised by a thermal shrinkage treatment carried out at a temperature of below 125 °C, preferably below 120 °C.
8. A high voltage duct according to one of Claims 1 to 7, characterised by embossed insulating films (15), the overall thickness of which after the thermal shrinkage treatment is at least 20 % greater than the thickness of a corresponding unembossed film.
EP81100116A 1980-01-18 1981-01-09 High-tension feed-through with layers of imprinted insulating foils Expired EP0032687B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81100116T ATE3343T1 (en) 1980-01-18 1981-01-09 HIGH VOLTAGE JACKET WITH LAYERS OF EMBOSSED INSULATING FILM.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3001779 1980-01-18
DE3001779A DE3001779C2 (en) 1980-01-18 1980-01-18 High-voltage bushing with layers of embossed insulating foils

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EP0032687A2 EP0032687A2 (en) 1981-07-29
EP0032687A3 EP0032687A3 (en) 1981-11-18
EP0032687B1 true EP0032687B1 (en) 1983-05-11

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US (1) US4362897A (en)
EP (1) EP0032687B1 (en)
AT (1) ATE3343T1 (en)
DE (1) DE3001779C2 (en)

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Publication number Priority date Publication date Assignee Title
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
CH698971A1 (en) * 2008-06-04 2009-12-15 Trench Switzerland Ag Isolation device.
EP2180485B1 (en) 2008-10-27 2011-05-11 Abb Research Ltd. High-voltage bushing
WO2011154029A1 (en) 2010-06-07 2011-12-15 Abb Research Ltd High-voltage sensor with axially overlapping electrodes

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CH405450A (en) * 1961-02-17 1966-01-15 Moser Glaser & Co Ag Process for the production of a capacitor-controlled cast resin insulating body around an electrical conductor
DE6937778U (en) * 1969-09-26 1972-06-15 Siemens Ag SPOOL WINDING.

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US3397098A (en) * 1962-03-15 1968-08-13 Moser Glaser & Co Ag Method of making insulating bodies
US3462545A (en) * 1967-01-13 1969-08-19 Westinghouse Electric Corp Condenser bushing
US3430116A (en) * 1967-12-06 1969-02-25 Hercules Inc Electrical capacitors
US3991451A (en) * 1968-10-04 1976-11-16 Tokyo Denki Kabushiki Kaisha Method of making a fluoride film capacitor
CH533377A (en) * 1971-04-29 1973-01-31 Gen Cable Corp Composite wrapped insulation for a cable - joint
DE2327629A1 (en) * 1973-05-30 1974-12-12 Siemens Ag FEED-THROUGH INSULATOR FOR HIGH VOLTAGE DEVICES AND METHODS FOR ITS MANUFACTURING

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CH405450A (en) * 1961-02-17 1966-01-15 Moser Glaser & Co Ag Process for the production of a capacitor-controlled cast resin insulating body around an electrical conductor
DE6937778U (en) * 1969-09-26 1972-06-15 Siemens Ag SPOOL WINDING.

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
US4362897A (en) 1982-12-07
ATE3343T1 (en) 1983-05-15
DE3001779C2 (en) 1987-01-02
EP0032687A3 (en) 1981-11-18
DE3001779A1 (en) 1981-07-23
EP0032687A2 (en) 1981-07-29

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