WO2017012780A1 - High or medium voltage installation comprising an insulating chamber - Google Patents

High or medium voltage installation comprising an insulating chamber Download PDF

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Publication number
WO2017012780A1
WO2017012780A1 PCT/EP2016/063469 EP2016063469W WO2017012780A1 WO 2017012780 A1 WO2017012780 A1 WO 2017012780A1 EP 2016063469 W EP2016063469 W EP 2016063469W WO 2017012780 A1 WO2017012780 A1 WO 2017012780A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulating
medium
foam
medium voltage
pores
Prior art date
Application number
PCT/EP2016/063469
Other languages
German (de)
French (fr)
Inventor
Thomas Hammer
Werner Hartmann
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2017012780A1 publication Critical patent/WO2017012780A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/002—Inhomogeneous material in general
    • H01B3/006—Other inhomogeneous material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/16—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/56—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances gases

Definitions

  • the invention relates to a gas-insulated high or medium voltage arrangement according to the preamble of patent claim 1.
  • GIS gas- Herten switchgear
  • GIL gas-insulated lines
  • the object of the invention is to provide an isolated high or medium voltage arrangement including insulated lines or insulated switchgear, which have as good or better ⁇ ins insulating behavior, as in the prior art is connected to the SF the case, however, a lowermaschinehauspo ⁇ have potential.
  • the present invention includes a high or medium voltage system, such as a gas insulated line (GIL) or a gas insulated switch (GIS).
  • GIL gas insulated line
  • GIS gas insulated switch
  • This system has at least one insulating space in different designs, which is provided with a gaseous insulating medium and with a filler.
  • the plant is characterized in that the insulating space at least partially with a
  • Foam is filled, having closed pores, wherein the pores are filled in the gaseous insulating medium.
  • a high-voltage resistant gas filling in the closed pores of the foam is suppressed in the pores, resulting in a better Iso ⁇ lationeigenschaft the entire Isolierkonglomerats, ie the composition of insulating medium in gaseous form and filler, the solid that forms the foam , as this would correspond to a corresponding filling exclusively with the insulating gas used.
  • gaseous insulating medium has a gas from the fol ⁇ constricting group Hydrofluorolefine, perfluoroketones,
  • Perfluoronitriles hydrofluoroxiranes, perfluoroxiranes, hydro- fluoroether, perfluoroether, nitrogen, carbon dioxide or a mixture thereof found to be advantageous.
  • the foam developed with the enclosed therein gaseous insulating medium its effect even with larger pores, however, it has been found that a Po ⁇ renging of less than 200 ym, and in particular of less than 120 ym for electrical insulation properties of the Bacisoliersystems is advantageous.
  • a Po ⁇ renging of less than 200 ym, and in particular of less than 120 ym for electrical insulation properties of the Bacisoliersystems is advantageous.
  • Sty renging of less than 200 ym and in particular of less than 120 ym for electrical insulation properties of the Bacisoliersystems is advantageous.
  • Sty ⁇ assumed that a pore size in a range between 80 and 120 ym has been in the 80% of the pore diameter are located upstream is teilhaft, particularly advantageous is a pore size distribution between 80 ym and 100 ym.
  • Figure 1 shows an arbitrary section of a foam structure in an insulating space with a filling of gaseous insulating medium.
  • High voltage range occur and there are classically insulated with an insulating gas. These include, among other things, the gas-insulated lines and the gas-insulated switchgear.
  • the electrical insulation proposed here has a combination of a gaseous insulating medium and a filler, wherein the filler is designed in the form of a show ⁇ me, the foam may for example on the basis of polymers that already have a high dielectric strength and good foaming property exhibit.
  • Suitable insulating gas are, in particular, hydrofluorolefins, perfluoroketones, perfluoronitriles, hydrofluoroxiranes, perfluoroxiranes, hydrofluoroethers, perfluoroethers, nitrogen or carbon dioxide.
  • Sulfur hexafluoride SFg
  • the section shown in the figure from an insulating ⁇ space 2 has a foam 8 polymer-based, which is equivalent to basic ⁇ additionally a solid filler. 6
  • the foam 8 has closed pores 10 having a pore diameter 12, which is preferably in a range between 80 ym and 120 ym. In principle, it is expedient that the pore diameter 12 is smaller than 200 ⁇ m, since this achieves the best insulating properties.
  • Foam structures with the foam 8 and the gaseous insulating medium 4 enclosed therein can either be produced separately with gas seal and introduced as corresponding structural components in the insulating space 2 of the plant, on the other hand, it is also possible to bring the entire insulating space in a gas-sealed insulated chamber and there foam the foam directly into the insulating space 2.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

The invention relates to a high or medium voltage installation comprising an insulating chamber (2) with a gaseous insulating medium (4) and a filling agent (6), said insulating chamber (2) is at least partially filled with a foam (8) which has closed pores (10), said pores (10) being filled with the gaseous insulating medium (4).

Description

Beschreibung description
Hoch- oder Mittelspannungsanlage mit einem Isolierraum Die Erfindung betrifft eine gasisolierte Hoch- oder Mittel¬ spannungsanordnung nach dem Oberbegriff des Patentanspruchs 1. The invention relates to a gas-insulated high or medium voltage arrangement according to the preamble of patent claim 1.
In Anlagen der Mittel- und Hochspannungstechnik, z.B. gasiso- Herten Schaltanlagen (GIS) , gasisolierten Leitungen (GIL) oder anderen, muss stets ein mit hohen elektrischen Feldern beaufschlagtes Volumen mit einer oder mehreren Hochspannungs¬ komponenten, zum Beispiel einer Vakuumschaltröhre, mit einem Medium gefüllt werden, welches keine elektrischen Durchschlä- ge zwischen Teilen mit unterschiedlichen Spannungspotenzialen zulässt . In plants of medium and high voltage equipment, for example, gas- Herten switchgear (GIS), gas-insulated lines (GIL) or other, must always be a acted upon with high electric fields volume with one or more high-voltage ¬ components, for example, a vacuum interrupter, with a medium be filled, which allows no electrical breakdown between parts with different voltage potentials.
Bisher werden zur Isolierung von Mittel- beziehungsweiseSo far, for the isolation of middle or
Hochspannungsanlagen, in gasisolierten Leitungen oder Schalt- anlagen, sehr häufig das Isoliergas SFg verwendet. Dieses Gas hat sehr gute Isoliereigenschaften, ist nicht toxisch und gut handhabbar. Das Problem an dem Schwefelhexafluorid besteht allerdings darin, dass es das etwa 23.000-fache Treibhauspo¬ tenzial von Kohlendioxid besitzt. Dieses außergewöhnlich hohe Treibhausgaspotenzial führt dazu, dass SFg in seiner Verwen¬ dung als Isoliergas reduziert werden soll. Hierzu werden eine Vielzahl von verschiedenen Gasen erprobt und diskutiert, die bisher jedoch nicht den durchschlagenden Erfolg erzielt haben. Ferner wurde bereits in früherer Zeit die Isolation durch flüssige Stoffe oder Feststoffe erprobt. Auch dies hat bisher noch nicht zu dem entsprechenden Erfolg geführt. High-voltage systems, in gas-insulated lines or switchgear, frequently uses the insulating gas SFg. This gas has very good insulating properties, is non-toxic and easy to handle. However, the problem of the sulfur hexafluoride is that it has the approximately 23,000-fold Treibhauspo ¬ potential of carbon dioxide. This exceptionally high global warming potential means that SF should be reduced as an insulating gas in of its uses ¬ dung. For this purpose, a variety of different gases are tested and discussed, which have not yet achieved the resounding success. Furthermore, the isolation by liquid substances or solids has already been tested in the past. This too has not yet led to the corresponding success.
Daher besteht die Aufgabe der Erfindung darin, eine isolierte Hoch- beziehungsweise Mittelspannungsanordnung einschließlich isolierter Leitungen beziehungsweise isolierte Schaltanlagen bereitzustellen, die ein ebenso gutes beziehungsweise besse¬ res Isolierverhalten aufweisen, wie dies im Stand der Technik mit dem SFg der Fall ist, jedoch ein geringeres Treibhauspo¬ tenzial aufweisen. Therefore, the object of the invention is to provide an isolated high or medium voltage arrangement including insulated lines or insulated switchgear, which have as good or better ¬ ins insulating behavior, as in the prior art is connected to the SF the case, however, a lower Treibhauspo ¬ have potential.
Die Lösung der Aufgabe besteht in einer Hoch- und Mittelspan- nungsanlage mit den Merkmalen des Patentanspruchs 1. The object is achieved in a high and medium voltage system with the features of claim 1.
Die vorliegende Erfindung umfasst eine Hoch- oder Mittelspannungsanlage, beispielsweise eine gasisolierte Leitung (GIL) oder einen gasisolierten Schalter (GIS) . Diese Anlage weist bei unterschiedlichen Bauformen zumindest einen Isolierraum auf, der mit einem gasförmigen Isoliermedium und mit einem Füllmittel versehen ist. Die Anlage zeichnet sich dadurch aus, dass der Isolierraum zumindest teilweise mit einem The present invention includes a high or medium voltage system, such as a gas insulated line (GIL) or a gas insulated switch (GIS). This system has at least one insulating space in different designs, which is provided with a gaseous insulating medium and with a filler. The plant is characterized in that the insulating space at least partially with a
Schaum gefüllt ist, der geschlossene Poren aufweist, wobei die Poren im gasförmigen Isoliermedium gefüllt sind. Durch die Verwendung einer hochspannungsfesten Gasfüllung in den geschlossenen Poren des Schaumes wird die Teilentladungstä¬ tigkeit in den Poren unterdrückt, was zu einer besseren Iso¬ lationseigenschaft des gesamten Isolierkonglomerats, also der Zusammensetzung aus Isoliermedium in Gasform und Füllstoff, der Feststoff, der den Schaum bildet, führt als dies einer entsprechenden Füllung ausschließlich mit dem verwendeten Isoliergas entspräche. Als gasförmiges Isoliermedium hat sich ein Gas aus der fol¬ genden Gruppe, Hydrofluorolefine, Perfluorketone, Foam is filled, having closed pores, wherein the pores are filled in the gaseous insulating medium. By using a high-voltage resistant gas filling in the closed pores of the foam Teilentladungstä ¬ activity is suppressed in the pores, resulting in a better Iso ¬ lationeigenschaft the entire Isolierkonglomerats, ie the composition of insulating medium in gaseous form and filler, the solid that forms the foam , as this would correspond to a corresponding filling exclusively with the insulating gas used. As gaseous insulating medium has a gas from the fol ¬ constricting group Hydrofluorolefine, perfluoroketones,
Perfluornitrile, Hydrofluoroxirane, Perfluoroxirane, Hydro- fluorether, Perfluorether, Stickstoff, Kohlendioxid oder einer Mischung hieraus als vorteilhaft herausgestellt. Perfluoronitriles, hydrofluoroxiranes, perfluoroxiranes, hydro- fluoroether, perfluoroether, nitrogen, carbon dioxide or a mixture thereof found to be advantageous.
Grundsätzlich entfaltet der Schaum mit dem darin eingeschlossenen gasförmigen Isoliermedium seine Wirkung auch bei größeren Poren, es hat sich jedoch herausgestellt, dass eine Po¬ rengröße von weniger als 200 ym, insbesondere von weniger als 120 ym für die elektrische Isolationseigenschaften des Gesamtisoliersystems vorteilhaft ist. Weiter hat sich herausge¬ stellt, dass eine Porengröße in einem Bereich zwischen 80 und 120 ym in der sich 80 % der Porendurchmesser befinden, vor- teilhaft ist, besonders vorteilhaft ist eine Porengrößenver- teilung zwischen 80 ym und 100 ym. Basically, the foam developed with the enclosed therein gaseous insulating medium its effect even with larger pores, however, it has been found that a Po ¬ rengröße of less than 200 ym, and in particular of less than 120 ym for electrical insulation properties of the Gesamtisoliersystems is advantageous. Further, herausge ¬ assumed that a pore size in a range between 80 and 120 ym has been in the 80% of the pore diameter are located upstream is teilhaft, particularly advantageous is a pore size distribution between 80 ym and 100 ym.
Weitere Ausgestaltungsformen der Erfindung und weitere Merk- male werden anhand der folgenden Figuren näher erläutert. Dabei handelt es sich lediglich um ein exemplarisches Ausfüh¬ rungsbeispiel, das keine Einschränkung des Schutzbereichs be¬ deutet. Dabei zeigt die einzige Figur: Figur 1 einen beliebigen Ausschnitt aus einer Schaumstruktur in einem Isolierraum mit einer Füllung aus gasförmigem Isoliermedium. Further embodiments of the invention and further features will be explained in more detail with reference to the following figures. It merely is an exemplary exporting ¬ approximate example, the be ¬ indicates no limitation of the scope. The sole figure: Figure 1 shows an arbitrary section of a foam structure in an insulating space with a filling of gaseous insulating medium.
Die vorliegende Ausgestaltung ist grundsätzlich für alle An- Wendungen geeignet, die im Mittelspannungsbereich und imThe present embodiment is fundamentally suitable for all applications which are in the medium-voltage range and in the
Hochspannungsbereich auftreten und dort klassischerweise mit einem Isoliergas isoliert sind. Darunter fallen unter anderem die gasisolierten Leitungen und die gasisolierten Schaltanlagen. Die hier vorgeschlagene elektrische Isolierung weist eine Kombination aus einem gasförmigen Isoliermedium und einem Füllmittel auf, wobei das Füllmittel in Form eines Schau¬ mes ausgestaltet ist, wobei der Schaum beispielsweise auf der Basis von Polymeren bestehen kann, die bereits eine hohe Spannungsfestigkeit und eine gute Schaumbildungseigenschaft aufweisen. Als Isoliergas kommen insbesondere Hydrofluorole- fine, Perfluorketone, Perfluornitrile, Hydrofluoroxirane, Perfluoroxirane, Hydrofluorether, Perfluorether, Stickstoff oder Kohlendioxid in Frage. Durch Verwendung der genannten Gase oder weiteren Gasen mit ähnlich guten Isoliereigenschaf- ten kann in Kombination mit einem Schaum 8 aus der Figur mit geschlossenen Poren 10 Isoliereigenschaften erzeugt werden, die im Bereich des bisher bekannten und üblichen High voltage range occur and there are classically insulated with an insulating gas. These include, among other things, the gas-insulated lines and the gas-insulated switchgear. The electrical insulation proposed here has a combination of a gaseous insulating medium and a filler, wherein the filler is designed in the form of a show ¬ me, the foam may for example on the basis of polymers that already have a high dielectric strength and good foaming property exhibit. Suitable insulating gas are, in particular, hydrofluorolefins, perfluoroketones, perfluoronitriles, hydrofluoroxiranes, perfluoroxiranes, hydrofluoroethers, perfluoroethers, nitrogen or carbon dioxide. By using the gases mentioned or other gases with similarly good insulating properties, in combination with a foam 8 from the figure with closed pores, it is possible to produce insulating properties which are in the range of the hitherto known and customary
Schwefelhexafluorid (SFg) liegen. Der in der Figur dargestellte Ausschnitt aus einem Isolier¬ raum 2 weist einen Schaum 8 auf Polymerbasis auf, der grund¬ sätzlich einem festen Füllmittel 6 gleichkommt. Der Schaum 8 weist geschlossene Poren 10 auf, die einen Porendurchmesser 12 aufweisen, der bevorzugt in einem Bereich zwischen 80 ym und 120 ym liegt. Grundsätzlich ist es zweckmäßig, dass der Porendurchmesser 12 kleiner als 200 ym ist, da so die besten Isoliereigenschaften erzielt werden. Sulfur hexafluoride (SFg). The section shown in the figure from an insulating ¬ space 2 has a foam 8 polymer-based, which is equivalent to basic ¬ additionally a solid filler. 6 The foam 8 has closed pores 10 having a pore diameter 12, which is preferably in a range between 80 ym and 120 ym. In principle, it is expedient that the pore diameter 12 is smaller than 200 μm, since this achieves the best insulating properties.
Da das Gas in den Schaum weitgehend fest eingeschlossen ist, können grundsätzlich auch toxische Substanzen beziehungsweise toxische gasförmige Isoliermedien 4 zum Einsatz kommen, wenn diese bei der Herstellung des Schaumes entsprechend sorgsam eingebracht werden. Somit eröffnet die vorliegende Anordnung die Erweiterung der potenziellen Isoliermedien, die bisher nicht für einen Ersatz des SFg in Betracht gekommen sind. Since the gas is largely firmly trapped in the foam, in principle toxic substances or toxic gaseous insulating media 4 can also be used if they are introduced with appropriate care during the production of the foam. Thus, the present arrangement opens up the expansion of potential isolation media that have not previously been considered for replacement of the SFg.
Durch die Kombination des Schaumes 8 mit dem gasförmigen Iso- liermedium 4 werden bei Verwendung eines entsprechend gut isolierenden Isoliermediums 4 Isolationseigenschaften in den Anlagen erreicht, die die des SFg übertreffen. Auf diese Wei¬ se ist es möglich, die gesamten Anlagen erheblich kleiner und kostengünstiger auszugestalten. By combining the foam 8 with the gaseous insulating medium 4, 4 insulation properties are achieved in the plants, which exceed those of the SFg when using a correspondingly well insulating insulating medium. In this Wei ¬ se, it is possible to design much smaller and less expensive, the entire plant.
Schaumstrukturen mit dem Schaum 8 und dem darin eingeschlossenen gasförmigen Isoliermedium 4 können unter Gasabschluss entweder separat hergestellt werden und als entsprechende Strukturbauteile in den Isolierraum 2 der Anlage eingebracht werden, andererseits ist auch möglich, den gesamten Isolierraum wiederum in einer gasabgeschlossenen isolierten Kammer zu bringen und dort den Schaum direkt in den Isolierraum 2 einzuschäumen . Foam structures with the foam 8 and the gaseous insulating medium 4 enclosed therein can either be produced separately with gas seal and introduced as corresponding structural components in the insulating space 2 of the plant, on the other hand, it is also possible to bring the entire insulating space in a gas-sealed insulated chamber and there foam the foam directly into the insulating space 2.

Claims

Patentansprüche claims
1. Hoch- oder Mittelspannungsanlage umfassend einen Isolier¬ raum (2) mit einem gasförmigen Isoliermedium (4) und einem Füllmittel (6), dadurch gekennzeichnet, dass der Isolierraum (2) zumindest teilweise mit einem Schaum (8) gefüllt ist, der geschlossene Poren (10) aufweist, wobei die Poren (10) mit dem gasförmigen Isoliermedium (4) gefüllt sind. 1. High or medium voltage system comprising an insulating ¬ space (2) with a gaseous insulating medium (4) and a filler (6), characterized in that the insulating space (2) is at least partially filled with a foam (8), the closed Having pores (10), wherein the pores (10) are filled with the gaseous insulating medium (4).
2. Hoch- oder Mittelspannungsanlage nach Anspruch 1, dadurch gekennzeichnet, dass das gasförmige Isoliermedium (4) ein Hydrofluorolefine, ein Perfluorketon, ein Perfluornitril , ein Hydrofluoroxiran, ein Perfluoroxiran, ein Hydrofluor- ether, ein Perfluorether, Stickstoff oder CO2 oder Mischungen hieraus enthält. 2. High or medium voltage installation according to claim 1, characterized in that the gaseous insulating medium (4) a hydrofluoroolefins, a perfluoroketone, a perfluoronitrile, a hydrofluoroxirane, a perfluorooxirane, a hydrofluoro ether, a perfluoro ether, nitrogen or CO 2 or mixtures thereof contains.
3. Hoch- oder Mittelspannungsanlage nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Poren (10) des Schaumes (8) kleiner als 200 ym, insbesondere kleiner als 120 ym sind. 3. high or medium voltage installation according to claim 1 or 2, characterized in that the pores (10) of the foam (8) are smaller than 200 ym, in particular smaller than 120 ym.
4. Hoch- oder Mittelspannungsanlage nach Anspruch 3, dadurch gekennzeichnet, dass die Poren (10) eine Verteilung aufwei¬ sen, wobei 80 % der Porendurchmesser in einem Bereich zwischen 80 ym und 120 ym, insbesondere zwischen 80 ym und 100 ym liegen. 4. high or medium voltage installation according to claim 3, characterized in that the pores (10) have a distribution aufwei ¬ sen, wherein 80% of the pore diameter in a range between 80 ym and 120 ym, in particular between 80 ym and 100 ym.
PCT/EP2016/063469 2015-07-20 2016-06-13 High or medium voltage installation comprising an insulating chamber WO2017012780A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015213600.0A DE102015213600A1 (en) 2015-07-20 2015-07-20 High or medium voltage system with an isolation room
DE102015213600.0 2015-07-20

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Publication Number Publication Date
WO2017012780A1 true WO2017012780A1 (en) 2017-01-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019125962A1 (en) * 2019-09-26 2021-04-01 Maschinenfabrik Reinhausen Gmbh Dry, syntactic foam as an electrically insulating material

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1575061A2 (en) * 2004-02-23 2005-09-14 Siemens Aktiengesellschaft Means for electrical insulation of medium and high voltage components
DE60319154T2 (en) * 2003-04-24 2009-02-05 National Research Council Of Canada, Ottawa DAMPER-FREE FOAM COMPOSITION AND CABLE WITH A LUBRICANT FOAMSET LAYER

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60319154T2 (en) * 2003-04-24 2009-02-05 National Research Council Of Canada, Ottawa DAMPER-FREE FOAM COMPOSITION AND CABLE WITH A LUBRICANT FOAMSET LAYER
EP1575061A2 (en) * 2004-02-23 2005-09-14 Siemens Aktiengesellschaft Means for electrical insulation of medium and high voltage components

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019125962A1 (en) * 2019-09-26 2021-04-01 Maschinenfabrik Reinhausen Gmbh Dry, syntactic foam as an electrically insulating material

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