EP2566641A1 - Electrically insulating material, insulating paper, and insulating tape for a high voltage rotary machine - Google Patents

Electrically insulating material, insulating paper, and insulating tape for a high voltage rotary machine

Info

Publication number
EP2566641A1
EP2566641A1 EP11717543A EP11717543A EP2566641A1 EP 2566641 A1 EP2566641 A1 EP 2566641A1 EP 11717543 A EP11717543 A EP 11717543A EP 11717543 A EP11717543 A EP 11717543A EP 2566641 A1 EP2566641 A1 EP 2566641A1
Authority
EP
European Patent Office
Prior art keywords
tape
insulating
rotary machine
insulating material
paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11717543A
Other languages
German (de)
French (fr)
Inventor
Peter GRÖPPEL
Mario Brockschmidt
Friedhelm Pohlmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
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 AG filed Critical Siemens AG
Publication of EP2566641A1 publication Critical patent/EP2566641A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • H01B3/004—Inhomogeneous material in general with conductive additives or conductive layers
    • 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
    • H01B3/025—Other inorganic material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/102—Oxide or hydroxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/206—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/302—Conductive
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/256—Heavy metal or aluminum or compound thereof
    • Y10T428/257—Iron oxide or aluminum oxide

Definitions

  • the invention relates to an electrical insulation material for a high-voltage rotary machine, an insulation paper, which is made of the insulating material, and a Isolati ⁇ onsband, which is made from the insulation paper.
  • Insulation tape is suitable for electrical insulation in a high voltage rotary machine.
  • turbo-generator For a high-voltage rotary machine, such as a turbo-generator in a power plant for generating electrical energy, high efficiency and high availability are required. The result is usually a high mechanical, thermal and electrical DEMANDS ⁇ monitoring the components of the turbogenerator.
  • the turbogenerator has a stator winding to which an be ⁇ Sonders high demands with regard to strength and reliabil ⁇ stechnik is provided.
  • the insulation system of the stator winding is heavily loaded at the interface between the main insulation and the laminated core of the stator winding by a high thermal, thermomechanical, dynamic and electromechanical operating stress, whereby the risk of damage to the stator winding insulation system is high due to partial discharges during operation the high-voltage rotary machine occur incessantly.
  • electrical conductors wires, coils, rods, sub-conductors
  • a high voltage insulation ⁇ one differentiates the insulation between conductor elements (conductor insulation) between the conductors or windings (conductor or winding insulation) and between the conductor and ground potential in the tongue and winding area (main ⁇ insulation).
  • the operational safety of the high-voltage rota- Onsmaschine is significantly the reliability of Isolier ⁇ system determined.
  • a problem of the insulation system is that due to the high electrical load of the insulating material of the insulation system this is exposed to a partial discharge-induced erosion.
  • "treeing" channels are formed in the insulating material, which can lead to an electrical breakdown of the insulating material.
  • the addition of mica, for example in the form of mica paper, to the insulating material desirably prevents the propagation of "treeing" channels in the insulating material.
  • mica particles having an aspect ratio of at least 50 are used, i. the ratio of length to width on one side and the
  • Mica particles thickness on the other side is at least 50. This Minim ⁇ form the mica particles a large upper ⁇ surface, align the mica particles to each other. As a result, the mica paper is elastically bendable and mechanically stressable. Evoked by an interaction by van der Waals forces or hydrogen bonds between the surfaces of the mica particles, bond forces determined by the size of contact surfaces of adjacent mica particles result. Thus, the mica is flexible paper and thus may for example be wrapped around a elekt ⁇ step ladder. The mica paper may be further imgargnieret means of a reaction resin and ⁇ still represent the a good barrier for "treeing" channels. The mica particles are exposed to the partial discharges, so that it is desirable that the mica particles have a high partial discharge resistance.
  • a corona shielding tape as, for example, a fabric with the mica tape, wherein the mica tape is attached to the fabric with an adhesive.
  • the insulation ⁇ system has the corona protection band, are to be electrically insulated with the electrical conductors in the high-voltage rotary machine.
  • the thermal conductivity of the conventionally impregnated with epoxy resins mica tape with glass or polyester fabric as a carrier material is about 0.2 - 0.25 W / mK at room temperature. Because of this to be classified as low thermal conductivity of the corona strip, the heat generated during operation of the high-voltage rotary machine in the conductor can be delivered poorly to the stator.
  • thermally conductive Parti ⁇ angle to provide in the corona shielding such as Bromnitrid or diamond. Since these materials have virtually no positive influence on the electrical resistance of the insulation system due to their dimensions and their physical properties, it is indispensable that the corona protection band is nevertheless mixed with the mica.
  • the proportion of the additional particles, and mica in the insulation system is adjusted such that the proportion of the mica is so high that the thermal conductivity of Glimmtikbands is sufficiently high, and the proportion of the additional particles is such ge ⁇ ring, that the resulting electrical resistance of Glimmschutzbands is sufficiently high.
  • the object of the invention is to provide an electrical insulating material for a high-voltage rotary machine, an insulation patch made of the insulating material, and an insulating tape made of the insulating paper, the electrical insulation of the high-voltage rotary machine being effective.
  • the electric insulation material for a high-voltage rotary machine comprises a base resin and a filler powder distributed in the base resin as a single filler, which is formed of platelet-shaped particles of alumina.
  • the proportion of the filler powder is preferably between 50% by volume and 75% by volume, the proportion of the filler powder more preferably being 70% by volume. Further, it is preferred that the filler powder be present in particle sizes in the range of 0.002 to 150 ym.
  • the filler powder is preferably present in monomodal, bimodal or multimodal distribution.
  • the insulating paper according to the invention for a high-voltage rotary machine has the electrical insulating material.
  • the insulating tape according to the invention for a Hochwoodsro ⁇ tationsmaschine includes a carrier tape and a tape of an insulating paper, the band being applied from the insulation paper on the carrier tape and fixed. It is preferred that the tape is glued by the insulating paper on the carrier tape.
  • the only filler in the base resin is formed by plate-like alumina particles with which due to their special shape, the electrical resistance of the insulating materials ⁇ is high.
  • the thermal conductivity of the insulating material is by the provision of only the flaky aluminum oxide particles high, since the intrinsic Leit ⁇ ability of alumina at 25 - 40 W / mK, wohinge ⁇ gen conventional mica has a value of 1 W / mK.
  • the insulating material can be processed to an insulating paper, which can be processed according to the invention to form an insulating strip, which can advantageously be used for electrical insulation in a high-voltage rotary machine.
  • the proportion of the plate-like alumina particles in the base resin is preferably up to 70% by volume without deteriorating the mechanical and electrical properties of the insulating material.
  • With a Vo ⁇ lumen Heilllgrad of Vol.50% platelet-shaped aluminum oxide particles in the base resin results in a thermal conductivity of 0.8 W / mK of the insulating material.
  • the insulating tape has a high resistance to the formation of "treeing" channels in the insulation paper, thereby advantageously high Volumengnacllgrade possible by the plurgitchenför ⁇ -shaped aluminum oxide particles in the base resin are.
  • the insulating material has a high varnishleitfä ⁇ ability. Due to the inorganic structure of the plate-like alumina particles in the base resin, the insulating material has high temperature resistance.
  • An electrical insulating material for a high voltage rotating machine is formed of a base resin.
  • a filler is provided as uniformly as possible dispersed in the base resin is at ⁇ sorted.
  • Another filler in particulate form is not provided in the base resin.
  • the filler is a filler powder formed from platelet-shaped particles of alumina.
  • the proportion of the filler powder in the base resin is Zvi ⁇ rule 50 vol% and 75 vol%, preferably 70 vol.%.
  • the filler powder is present in particle sizes in the range of 0.002 ym to 150 ym. Furthermore, the filler powder is in monomodal, bimodal or multimodal distribution.
  • An insulation paper for a high voltage rotary machine is made with the electrical insulation material.
  • an insulation tape for a high voltage rotary machine is made with the insulation paper.
  • the insulation ⁇ band has a carrier band and a band of the Isolationspa ⁇ pier. The tape from the insulating paper is applied and fixed on the carrier tape, the tape being glued to the carrier tape by the insulating paper.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Bodies (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Paper (AREA)

Abstract

The invention relates to an electrically insulating material for a high voltage rotary machine, comprising a base resin and a filler powder distributed in the base resin as the sole filler, formed of disc shaped particles made of aluminum oxide. An insulating paper for a high voltage rotary machine comprises the electrically insulating material. In insulating tape for a high voltage rotary machine comprises a carrier tape and a tape of an insulating paper, wherein the tape of the insulating paper is applied to and secured on the carrier tape.

Description

Beschreibung description
Elektrisches Isoliermaterial, Isolationspapier und Isolati¬ onsband für eine Hochspannungsrotationsmaschine Electrical insulating material, insulation paper and Isolati ¬ onsband for a high voltage rotary machine
Die Erfindung betrifft ein elektrisches Isoliermaterial für eine Hochspannungsrotationsmaschine, ein Isolationspapier, das aus dem Isoliermaterial hergestellt ist, und ein Isolati¬ onsband, das aus dem Isolationspapier hergestellt ist. Das elektrische Isoliermaterial, das Isolationspapier und dasThe invention relates to an electrical insulation material for a high-voltage rotary machine, an insulation paper, which is made of the insulating material, and a Isolati ¬ onsband, which is made from the insulation paper. The electrical insulation material, the insulation paper and the
Isolationsband sind geeignet für die elektrische Isolation in einer Hochspannungsrotationsmaschine . Insulation tape is suitable for electrical insulation in a high voltage rotary machine.
Für eine Hochspannungsrotationsmaschine, wie beispielsweise einen Turbogenerator in einem Kraftwerk zur Erzeugung von elektrischer Energie, sind ein hoher Wirkungsgrad und eine hohe Verfügbarkeit gefordert. Daraus resultiert in der Regel eine hohe mechanische, thermische und elektrische Beanspru¬ chung der Bauteile des Turbogenerators. Der Turbogenerator weist insbesondere eine Ständerwicklung auf, an die eine be¬ sonders hohe Anforderung bezüglich Festigkeit und Zuverläs¬ sigkeit gestellt ist. Insbesondere ist das Isoliersystem der Ständerwicklung an der Grenzfläche zwischen der Hauptisolierung und dem Blechpaket der Ständerwicklung durch eine hohe thermische, thermomechanische, dynamische und elektromechani- sche Betriebsbeanspruchung stark belastet, wodurch das Risiko einer Beschädigung des Isoliersystems der Ständerwicklung durch Teilentladungen hoch ist, die beim Betrieb der Hochspannungsrotationsmaschine unablässig auftreten. Mit dem Iso- liersystem sind elektrische Leiter (Drähte, Spulen, Stäbe, Teilleiter) dauerhaft gegeneinander und gegen ein Ständerblechpaket oder die Umgebung isoliert. Innerhalb einer Hoch¬ spannungsisolierung unterscheidet man die Isolierung zwischen Teilleitern (Teilleiterisolierung), zwischen den Leitern bzw. Windungen (Leiter- bzw. Windungsisolierung) und zwischen Leiter und Massepotenzial im Nut- und Wickelkopfbereich (Haupt¬ isolierung) . Die Betriebssicherheit der Hochspannungsrotati- onsmaschine ist maßgeblich der Zuverlässigkeit des Isolier¬ systems bestimmt. For a high-voltage rotary machine, such as a turbo-generator in a power plant for generating electrical energy, high efficiency and high availability are required. The result is usually a high mechanical, thermal and electrical DEMANDS ¬ monitoring the components of the turbogenerator. In particular, the turbogenerator has a stator winding to which an be ¬ Sonders high demands with regard to strength and reliabil ¬ sigkeit is provided. In particular, the insulation system of the stator winding is heavily loaded at the interface between the main insulation and the laminated core of the stator winding by a high thermal, thermomechanical, dynamic and electromechanical operating stress, whereby the risk of damage to the stator winding insulation system is high due to partial discharges during operation the high-voltage rotary machine occur incessantly. With the insulation system, electrical conductors (wires, coils, rods, sub-conductors) are permanently insulated against each other and against a stator core or the surrounding area. Within a high voltage insulation ¬ one differentiates the insulation between conductor elements (conductor insulation) between the conductors or windings (conductor or winding insulation) and between the conductor and ground potential in the tongue and winding area (main ¬ insulation). The operational safety of the high-voltage rota- Onsmaschine is significantly the reliability of Isolier ¬ system determined.
Ein Problem des Isoliersystems ist es, dass aufgrund der starken elektrischen Belastung des Isoliermaterials des Isoliersystems dieses einer teilentladungsinduzierten Erosion ausgesetzt ist. Dabei bilden sich "Treeing"-Kanäle in dem Isoliermaterial aus, die zu einem elektrischen Durchschlag des Isoliermaterials führen können. Bekanntermaßen ist durch eine Zugabe von Glimmer, beispielsweise in Form von Glimmerpapier, zu dem Isoliermaterial die Ausbreitung von "Treeing"- Kanälen in dem Isoliermaterial wünschenswert unterbunden. Bei der Herstellung von Glimmerpapier werden Glimmerpartikel mit einem Aspektverhältnis von mindestens 50 eingesetzt, d.h. das Verhältnis von Länge zu Breite auf der einen Seite und dieA problem of the insulation system is that due to the high electrical load of the insulating material of the insulation system this is exposed to a partial discharge-induced erosion. In this case, "treeing" channels are formed in the insulating material, which can lead to an electrical breakdown of the insulating material. As is known, the addition of mica, for example in the form of mica paper, to the insulating material desirably prevents the propagation of "treeing" channels in the insulating material. In the production of mica paper, mica particles having an aspect ratio of at least 50 are used, i. the ratio of length to width on one side and the
Glimmerpartikeldicke auf der anderen Seite liegt bei mindes¬ tens 50. Dadurch bilden die Glimmerpartikel eine große Ober¬ fläche, wobei sich die Glimmerpartikel zueinander ausrichten. Dadurch ist das Glimmerpapier elastisch verbiegbar und mecha- nisch beanspruchbar. Hervorgerufen durch eine Wechselwirkung durch van der Waals-Kräfte oder Wasserstoffbrückenbindungen zwischen den Oberflächen der Glimmerpartikel ergebenden sich Bindungskräfte, die von der Größe von Kontaktflächen benachbarter Glimmerpartikel bestimmt sind. Somit ist das Glimmer- papier flexibel und kann somit beispielsweise um einen elekt¬ rischen Leiter gewickelt werden. Das Glimmerpapier kann ferner mittels eines Reaktionsharzes imprägnieret sein und den¬ noch eine gute Barriere für „Treeing"-Kanälen darstellen. Die Glimmerpartikel sind den Teilentladungen ausgesetzt, so dass es wünschenswert ist, dass die Glimmerpartikel eine hohe Teilentladungsresistenz haben. Diese ist aufgrund der organischen Struktur der Glimmerpartikel gegeben. Zur Verbesserung der mechanischen Festigkeit des Glimmerpapiers ist dieses auf einen Träger aus Glas- oder Polyestergewebe aufgebracht, wo¬ mit das Glimmerpapier einen Verbundwerkstoff bildet. Dieser wir dadurch hergestellt, indem das Glimmerpapier mittels eines flüssigen und reaktiven Polymers imprägniert und aushär- tet wird. Das Glimmerpapier in Streifenform bildet ein Glimmerband . Mica particles thickness on the other side is at least 50. This Minim ¬ form the mica particles a large upper ¬ surface, align the mica particles to each other. As a result, the mica paper is elastically bendable and mechanically stressable. Evoked by an interaction by van der Waals forces or hydrogen bonds between the surfaces of the mica particles, bond forces determined by the size of contact surfaces of adjacent mica particles result. Thus, the mica is flexible paper and thus may for example be wrapped around a elekt ¬ step ladder. The mica paper may be further imprägnieret means of a reaction resin and ¬ still represent the a good barrier for "treeing" channels. The mica particles are exposed to the partial discharges, so that it is desirable that the mica particles have a high partial discharge resistance. This is due to the organic given structure of the mica particles. to improve the mechanical strength of the mica paper that is applied to a support made of glass or polyester tissue, where ¬ forms a composite material with the mica paper. this we prepared by using the mica paper is impregnated with a liquid and the reactive polymer and aushär - tet is. The mica paper in strip form forms a mica tape.
Bekannt ist es ein Glimmschutzband als beispielsweise ein Ge- webe mit dem Glimmerband herzustellen, wobei mit einem Kleber das Glimmerband auf dem Gewebe befestigt ist. Das Isolations¬ system weist das Glimmschutzband auf, mit dem elektrische Leiter in der Hochspannungsrotationsmaschine elektrisch zu isolieren sind. Die Wärmeleitfähigkeit von dem herkömmlich mit Epoxidharzen imprägnierten Glimmerband mit Glas- oder Polyestergewebe als Trägermaterial beträgt ca. 0,2 - 0,25 W/mK bei Raumtemperatur. Aufgrund dieser als gering einzustufenden Wärmeleitfähigkeit des Glimmschutzbands kann die beim Betrieb der Hochspannungsrotationsmaschine im Leiter gebildete Wärme nur schlecht an den Stator abgegeben werden. Dadurch bildet sich beim Betrieb der Hochspannungsrotationsmaschine ein Wär¬ mestau an dem Glimmschutzband aus. Deshalb sind in der Regel die Statoren großer Generatoren beispielsweise mittels Was¬ serstoff oder Wasser gekühlt. Abhilfe könnte eine Verringe- rung der Dicke des Glimmschutzbands schaffen, wodurch die Ef¬ fizienz und der elektrische Wirkungsgrad der Hochspannungsro¬ tationsmaschine gesteigert werden könnte. It is known to produce a corona shielding tape as, for example, a fabric with the mica tape, wherein the mica tape is attached to the fabric with an adhesive. The insulation ¬ system has the corona protection band, are to be electrically insulated with the electrical conductors in the high-voltage rotary machine. The thermal conductivity of the conventionally impregnated with epoxy resins mica tape with glass or polyester fabric as a carrier material is about 0.2 - 0.25 W / mK at room temperature. Because of this to be classified as low thermal conductivity of the corona strip, the heat generated during operation of the high-voltage rotary machine in the conductor can be delivered poorly to the stator. This one Were ¬ mestau at the Corona shielding band formed from the operation of the high voltage rotary machine. Therefore, in general, the stators of large generators are cooled, for example by means of what ¬ serstoff or water. This could be remedied for a reduction in thickness of the Glimmschutzbands create, whereby the ef ficiency ¬ and the electrical efficiency of the Hochspannungsro ¬ tationsmaschine could be increased.
Zur weiteren Steigerung der Wärmeleitfähigkeit des Glimm- schutzbands ist es bekannt zusätzlich wärmeleitfähige Parti¬ kel, wie z.B. Bromnitrid oder Diamant, in dem Glimmschutzband vorzusehen. Da diese Materialien aufgrund ihrer Abmessungen und ihrer physikalischen Eigenschaften so gut wie keinen positiven Einfluss auf die elektrische Festigkeit des Isolier- Systems haben, ist es unerlässlich, dass das Glimmschutzband dennoch mit dem Glimmer versetzt ist. Der Anteil der zusätzlichen Partikel und des Glimmers im Isoliersystem ist derart abgestimmt, dass der Anteil des Glimmers derart hoch ist, dass die Wärmeleitfähigkeit des Glimmschutzbands ausreichend hoch ist, und der Anteil der zusätzlichen Partikel derart ge¬ ring ist, dass die resultierende elektrische Festigkeit des Glimmschutzbands ausreichend hoch ist. Mit einem herkömmli¬ chen Glimmschutzband mit zusätzlichen Bornitrid-Partikeln ist eine maximale Wärmeleitfähigkeit von 0,5 W/mK bei Raumtempe¬ ratur erreichbar. Nachteilig hierbei ist, dass die Schichtdi¬ cke des Glimmschutzbandes hoch ist und dass die Bornitrid- Partikel senkrecht zum Glimmschutzband eine geringere Wärme- leitfähigkeit als in Längsrichtung des Glimmschutzbands ha¬ ben. Dadurch ist die Wärmeleitfähigkeit des Glimmschutzbands nachteilig anisotrop, wodurch der Einsatz dieses Glimmschutzbands einschränkt ist. Aufgabe der Erfindung ist es, ein elektrisches Isoliermaterial für eine Hochspannungsrotationsmaschine, ein Isolationspa¬ pier, das aus dem Isoliermaterial hergestellt ist, und ein Isolationsband, das aus dem Isolationspapier hergestellt ist, zu schaffen, wobei die elektrische Isolation der Hochspan- nungsrotationsmaschine effektiv ist. To further increase the thermal conductivity of the corona shielding bands is known additionally thermally conductive Parti ¬ angle, to provide in the corona shielding such as Bromnitrid or diamond. Since these materials have virtually no positive influence on the electrical resistance of the insulation system due to their dimensions and their physical properties, it is indispensable that the corona protection band is nevertheless mixed with the mica. The proportion of the additional particles, and mica in the insulation system is adjusted such that the proportion of the mica is so high that the thermal conductivity of Glimmschutzbands is sufficiently high, and the proportion of the additional particles is such ge ¬ ring, that the resulting electrical resistance of Glimmschutzbands is sufficiently high. With a herkömmli ¬ chen corona protection tape with additional boron nitride particles is a maximum thermal conductivity of 0.5 W / mK at room temperature Tempe ¬ achievable. The disadvantage here is that the blocks of the Schichtdi ¬ Glimmschutzbandes is high and that the boron nitride particles conductivity perpendicular to the corona-shielding strip less heat than in the longitudinal direction of the Glimmschutzbands ha ¬ ben. As a result, the thermal conductivity of the corona shielding tape is disadvantageous anisotropic, whereby the use of this corona shielding tape is limited. The object of the invention is to provide an electrical insulating material for a high-voltage rotary machine, an insulation patch made of the insulating material, and an insulating tape made of the insulating paper, the electrical insulation of the high-voltage rotary machine being effective.
Das erfindungsgemäße elektrisches Isoliermaterial für eine Hochspannungsrotationsmaschine weist ein Basisharz und ein in dem Basisharz als einzigen Füllstoff verteiltes Füllstoffpul- ver auf, das von plättchenförmigen Partikeln aus Aluminiumoxid gebildet ist. Bevorzugtermaßen liegt der Anteil des Füllstoffpulvers zwischen 50 Vol.% und 75 Vol.%, wobei der Anteil des Füllstoffpulvers mehr bevorzugt bei 70 Vol.% liegt. Ferner ist es bevorzugt, dass das Füllstoffpulver in Partikelgrößen im Bereich von 0,002 ym bis 150 ym vorliegt.The electric insulation material for a high-voltage rotary machine according to the present invention comprises a base resin and a filler powder distributed in the base resin as a single filler, which is formed of platelet-shaped particles of alumina. The proportion of the filler powder is preferably between 50% by volume and 75% by volume, the proportion of the filler powder more preferably being 70% by volume. Further, it is preferred that the filler powder be present in particle sizes in the range of 0.002 to 150 ym.
Dabei liegt das Füllstoffpulver bevorzugt in monomodaler, bimodaler oder multimodaler Verteilung vor. The filler powder is preferably present in monomodal, bimodal or multimodal distribution.
Das erfindungsgemäße Isolationspapier für eine Hochspannungs- rotationsmaschine weist das elektrischen Isoliermaterial auf. Das Erfindungsgemäße Isolationsband für eine Hochspannungsro¬ tationsmaschine weist ein Trägerband und ein Band von einem Isolationspapier auf, wobei das Band von dem Isolationspapier auf dem Trägerband aufgebracht und befestigt ist. Bevorzugt ist, dass das Band von dem Isolationspapier auf das Trägerband geklebt ist. Der einzige Füllstoff in dem Basisharz ist gebildet von plättchenförmigen Aluminiumoxidpartikeln, mit denen aufgrund ihrer speziellen Form die elektrische Festigkeit des Isolier¬ materials hoch ist. Ferner ist durch das Vorsehen lediglich der plättchenförmigen Aluminiumoxidpartikeln die Wärmeleitfähigkeit des Isoliermaterials hoch, da die intrinsische Leit¬ fähigkeit von Aluminiumoxids bei 25 - 40 W/mK liegt, wohinge¬ gen herkömmlicher Glimmer einen Wert von 1 W/mK hat. Dadurch ist es mit dem erfindungsgemäßen Vorsehen der plättchenförmi- gen Aluminiumoxidpartikeln in dem Isoliermaterial ermöglicht, dass das erfindungsgemäße Isoliermaterial ohne den herkömmli¬ chen Glimmerzusatz auskommt. Ferner ist der Isolierwerkstoff zu einem Isolationspapier verarbeitbar, das erfindungemäß zu einem Isolationsband verarbeitbar ist, das in einer Hochspan- nungsrotationsmaschine vorteilhaft zur elektrischen Isolation einsetzbar ist. Der Anteil an den plättchenförmigen Aluminiumoxidpartikeln in dem Basisharz beträgt bevorzugt bis zu 70 Vol.-%, ohne dass dabei die mechanischen und elektrischen Eigenschaften des Isoliermaterials verschlechtert sind. Je hö- her der Volumenfüllgrad der plättchenförmigen Aluminiumoxid¬ partikeln in dem Basisharz ist, desto höher ist die resultierende Wärmeleitfähigkeit des Isoliermaterials. Bei einem Vo¬ lumenfüllgrad von Vol.50% plättchenförmigen Aluminiumoxidpartikeln in dem Basisharz ergibt sich eine thermische Leitfä- higkeit von 0,8 W/mK des Isoliermaterials. The insulating paper according to the invention for a high-voltage rotary machine has the electrical insulating material. The insulating tape according to the invention for a Hochspannungsro ¬ tationsmaschine includes a carrier tape and a tape of an insulating paper, the band being applied from the insulation paper on the carrier tape and fixed. It is preferred that the tape is glued by the insulating paper on the carrier tape. The only filler in the base resin is formed by plate-like alumina particles with which due to their special shape, the electrical resistance of the insulating materials ¬ is high. Further, the thermal conductivity of the insulating material is by the provision of only the flaky aluminum oxide particles high, since the intrinsic Leit ¬ ability of alumina at 25 - 40 W / mK, wohinge ¬ gen conventional mica has a value of 1 W / mK. This makes it possible with the inventive provision of the plättchenförmi- gen aluminum oxide particles in the insulation material that insulation material according to the invention does not require the herkömmli ¬ chen mica additive. Furthermore, the insulating material can be processed to an insulating paper, which can be processed according to the invention to form an insulating strip, which can advantageously be used for electrical insulation in a high-voltage rotary machine. The proportion of the plate-like alumina particles in the base resin is preferably up to 70% by volume without deteriorating the mechanical and electrical properties of the insulating material. The higher the volume filling the plate-like alumina ¬ particles in the base resin, the higher the resulting thermal conductivity of the insulating material. With a Vo ¬ lumenfüllgrad of Vol.50% platelet-shaped aluminum oxide particles in the base resin results in a thermal conductivity of 0.8 W / mK of the insulating material.
Außerdem ist es aufgrund der flächigen Ausbildung der plättchenförmigen Aluminiumoxidpartikeln in dem Basisharz möglich, das Isolationsband mit dem Isolationspapier, das aus dem Iso- liermaterial hergestellt ist, einfach flächig zu formen. Da¬ durch ist mit dem Isolationsband vorteilhaft eine Umwicklung von Leitern der Hochspannungsrotationsmaschine möglich, wobei das Isolationsband ferner einer Imprägnierung, insbesondere einer Durchimprägnierung, unterzogen werden kann. Außerdem hat das Isoliermaterial eine hohe Beständigkeit gegenüber der Bildung von „Treeing"-Kanälen in dem Isolationspapier, wodurch vorteilhaft hohe Volumenfüllgrade von den plättchenför¬ migen Aluminiumoxidpartikeln in dem Basisharz ermöglicht sind. Dadurch hat das Isoliermaterial eine hohe Wärmeleitfä¬ higkeit. Aufgrund der anorganischen Struktur der plättchen- förmigen Aluminiumoxidpartikeln in dem Basisharz hat das Isoliermaterial eine hohe Temperaturbeständigkeit. In addition, due to the planar formation of the plate-like alumina particles in the base resin, it is possible to easily form the insulating tape with the insulating paper made of the insulating material flatly. As a result, it is advantageously possible to wrap conductors of the high-voltage rotary machine with the insulating strip, wherein the insulating strip can furthermore be subjected to impregnation, in particular to a thorough impregnation. In addition, the insulating material has a high resistance to the formation of "treeing" channels in the insulation paper, thereby advantageously high Volumenfüllgrade possible by the plättchenför ¬-shaped aluminum oxide particles in the base resin are. As a result, the insulating material has a high Wärmeleitfä ¬ ability. Due to the inorganic structure of the plate-like alumina particles in the base resin, the insulating material has high temperature resistance.
Anhand eines Beispiels wird im Folgenden die Erfindung näher erläutet . By way of example, the invention will be explained in more detail below.
Ein elektrisches Isoliermaterial für eine Hochspannungsrota- tionsmaschine ist von einem Basisharz gebildet. Als einziger Füllstoff in dem Basisharz ist ein Füllstoffpulver vorgesehen, das möglichst gleichmäßig in dem Basisharz verteilt an¬ geordnet ist. Ein anderer Füllstoff in Partikelform ist in dem Basisharz nicht vorgesehen. Der Füllstoff ist ein Füll- stoffpulver, das von plättchenförmigen Partikeln aus Aluminiumoxid gebildet ist. An electrical insulating material for a high voltage rotating machine is formed of a base resin. As the only filler in the base resin, a filler is provided as uniformly as possible dispersed in the base resin is at ¬ sorted. Another filler in particulate form is not provided in the base resin. The filler is a filler powder formed from platelet-shaped particles of alumina.
Der Anteil des Füllstoffpulvers in dem Basisharz liegt zwi¬ schen 50 Vol% und 75 Vol%, bevorzugt bei 70 Vol.%. Das Füll- stoffpulver liegt in Partikelgrößen im Bereich von 0,002 ym bis 150 ym vor. Ferner liegt das Füllstoffpulver in monomodaler, bimodaler oder multimodaler Verteilung vor. The proportion of the filler powder in the base resin is Zvi ¬ rule 50 vol% and 75 vol%, preferably 70 vol.%. The filler powder is present in particle sizes in the range of 0.002 ym to 150 ym. Furthermore, the filler powder is in monomodal, bimodal or multimodal distribution.
Ein Isolationspapier für eine Hochspannungsrotationsmaschine ist mit dem elektrischen Isoliermaterial gefertigt. Außerdem ist mit dem Isolationspapier ein Isolationsband für eine Hochspannungsrotationsmaschine hergestellt. Das Isolations¬ band weist ein Trägerband und ein Band von dem Isolationspa¬ pier auf. Das Band von dem Isolationspapier ist auf dem Trä- gerband aufgebracht und befestigt, wobei das Band von dem Isolationspapier auf das Trägerband geklebt ist. An insulation paper for a high voltage rotary machine is made with the electrical insulation material. In addition, an insulation tape for a high voltage rotary machine is made with the insulation paper. The insulation ¬ band has a carrier band and a band of the Isolationspa ¬ pier. The tape from the insulating paper is applied and fixed on the carrier tape, the tape being glued to the carrier tape by the insulating paper.

Claims

Patentansprüche claims
1. Elektrisches Isoliermaterial für eine Hochspannungsrotati¬ onsmaschine, mit einem Basisharz und einem in dem Basisharz als einzigen Füllstoff verteilten Füllstoffpulver, das von plättchenförmigen Partikeln aus Aluminiumoxid gebildet ist. 1. Electrical insulating material for a Hochspannungsrotati ¬ onsmaschine, with a base resin and a distributed in the base resin as a single filler filler powder, which is formed of platelet-shaped particles of alumina.
2. Isoliermaterial gemäß Anspruch 1, wobei der Anteil des Füllstoffpulvers zwischen 50 Vol% und 75 Vol%, bevorzugt bei 70 Vol.% liegt. 2. Insulating material according to claim 1, wherein the proportion of the filler powder between 50 vol% and 75 vol%, preferably at 70 vol.% Is.
3. Isoliermaterial gemäß Anspruch 1 oder 2, wobei das Füll¬ stoffpulver in Partikelgrößen im Bereich von 0,002 ym bis 150 ym vorliegt. 3. Insulating material according to claim 1 or 2, wherein the filler material powder ¬ in particle sizes in the range of 0.002 ym to 150 ym is present.
4. Isoliermaterial gemäß einem der Ansprüche 1 bis 3, wobei das Füllstoffpulver in monomodaler, bimodaler oder multimodaler Verteilung vorliegt. 4. Insulating material according to one of claims 1 to 3, wherein the filler powder is present in monomodal, bimodal or multimodal distribution.
5. Isolationspapier für eine Hochspannungsrotationsmaschine, mit einem elektrischen Isoliermaterial gemäß einem der Ansprüche 1 bis 4. 5. insulation paper for a high-voltage rotary machine, with an electrical insulation material according to one of claims 1 to 4.
6. Isolationsband für eine Hochspannungsrotationsmaschine, mit einem Trägerband und einem Band von einem Isolationspa¬ pier gemäß Anspruch 5, wobei das Band von dem Isolationspa¬ pier auf dem Trägerband aufgebracht und befestigt ist. 6. insulation tape for a high voltage rotary machine, with a carrier tape and a tape of a Isolationspa ¬ pier according to claim 5, wherein the tape is applied and fixed by the Isolationspa ¬ pier on the carrier tape.
7. Isolationsband gemäß Anspruch 6, wobei das Band von dem Isolationspapier auf das Trägerband geklebt ist. 7. Insulating tape according to claim 6, wherein the tape is glued by the insulating paper on the carrier tape.
EP11717543A 2010-05-07 2011-04-20 Electrically insulating material, insulating paper, and insulating tape for a high voltage rotary machine Withdrawn EP2566641A1 (en)

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PCT/EP2011/056375 WO2011138173A1 (en) 2010-05-07 2011-04-20 Electrically insulating material, insulating paper, and insulating tape for a high voltage rotary machine

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WO2011138173A1 (en) 2011-11-10
RU2534744C2 (en) 2014-12-10
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CN102869467B (en) 2016-02-24
DE102010019721A1 (en) 2011-11-10
RU2012152608A (en) 2014-06-20

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