EP1711952A1 - Bande semiconductrice contenant du mica revetu d'oxyde de zinc dope a l'antimoine et utilisation - Google Patents

Bande semiconductrice contenant du mica revetu d'oxyde de zinc dope a l'antimoine et utilisation

Info

Publication number
EP1711952A1
EP1711952A1 EP05701637A EP05701637A EP1711952A1 EP 1711952 A1 EP1711952 A1 EP 1711952A1 EP 05701637 A EP05701637 A EP 05701637A EP 05701637 A EP05701637 A EP 05701637A EP 1711952 A1 EP1711952 A1 EP 1711952A1
Authority
EP
European Patent Office
Prior art keywords
filler
tape
tape according
range
antimony
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Withdrawn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
EP05701637A
Other languages
German (de)
English (en)
Inventor
Heinrich Kapitza
Volker Muhrer
Norbert Müller
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 EP1711952A1 publication Critical patent/EP1711952A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic 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
    • H01B3/002—Inhomogeneous material in general
    • H01B3/004—Inhomogeneous material in general with conductive additives or conductive layers
    • 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
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2738—Coating or impregnation intended to function as an adhesive to solid surfaces subsequently associated therewith

Definitions

  • the invention relates to a semiconducting tape, in particular one which is suitable for equipotential bonding in high-voltage transformers.
  • the yokes which consist of individual sheets stacked on top of one another, are bandaged with an insulating tape, which is also referred to as a winding tape.
  • an insulating tape which is also referred to as a winding tape.
  • the maximum value of the electrical voltage is determined by the corresponding breakdown field strength of the air. If this is exceeded, glow and sliding discharges occur, which can destroy the insulation.
  • One tries to avoid this by first applying a semiconducting intermediate layer in the form of a winding tape as potential equalization to the yoke before bandaging with the insulating tape.
  • Such tapes are known from epoxy resin, preferably from an epoxy resin that only hardens at elevated temperature, is incorporated into the carbon black. Glass fabric tapes are impregnated with this epoxy resin and the tapes are made from them.
  • the electrical resistance of the belts is adjusted via the amount of soot incorporated. It is problematic, however, that in the area of interest for this application, a small addition or release of soot changes the conductivity / electrical resistance of the strip by several powers of ten. This greatly complicates the reliability during manufacture.
  • the desired conductivity is in the range of 10 3 to 10 6 ⁇ c, which is obtained with a soot content of approx. 21.5 - 23% in the epoxy resin. In the range between 15% and 25% soot content, the specific electrical resistance of the resulting epoxy resin from 10 14 ⁇ cm to 10 ⁇ ⁇ c, so that there are major problems with the reproducibility of the set and desired conductivity.
  • the invention relates to a tape made of a fabric material which is impregnated with a filler-containing binder, the filler, in the overpercolated state, causing a surface resistance in the range from 1 to 100 k ⁇ / sq.
  • the invention also relates to the use of the tape as a winding tape in electrical machines, in particular high-voltage machines, transformers, chokes and for equipotential bonding in high-voltage transformers.
  • the filler is accordingly selected so that the concentration in the over-percolated state in the fabric-reinforced plastic matrix corresponds to an electrical surface resistance in the range from 1 to 100 kOhm / square.
  • the addition of filler can also vary within certain limits that are acceptable for mass production and with regard to reproducibility, without the value of the resistance leaving the desired and defined range.
  • Over-percolated means that there is no serious change in the resistance behavior when the filler is added, since there are already so many contacts between the conductive particles that a further increase in concentration has hardly any effect on the electrical resistance.
  • the filler is advantageously coated with a layer of an antimony-tin mixed oxide, in particular with an antimony-doped tin oxide layer.
  • the level of conductivity in the mixed oxide, the layer thickness of the mixed oxide and the grain size and shape of the fillers can be adjusted.
  • Antimony-tin oxide fillers can also be used.
  • coatings and / or coatings are selected whose thickness is in the range from one nm to a few hundred ⁇ m, particularly preferably in the range from 5 nm to 20 ⁇ m, or 50 nm to 7 ⁇ m, etc.
  • All known inorganic and / or mineral fillers are used, such as potassium titanate, Al 2 0 3 (corundum), chalk, talc, barium sulfate, Si0 2 (quartz), quartz powder, kaolin, titanium dioxide, generally titanates, mica and the like , Fillers which have been coated with another layer, for example SiO 2 , before coating with antimony-tin oxide are also suitable.
  • the filler is preferably added in an amount of 20 to 50% by weight, particularly preferably 22 to 45% by weight, based on the solids content in the binder.
  • the ratio of the antimony to the tin component in the mixed oxide can vary within wide limits. As a rule, the antimony content will be lower than the tin content, ie antimony oxide ⁇ 50% and tin oxide> 50% in the mixed oxide.
  • the antimony content is preferably less than / equal to 30% and the tin content greater than / equal to 70%.
  • the particle size of the filler is preferably in the range (average particle size ⁇ 15 ⁇ m).
  • the particle shape of the filler is preferably splintered and / or flake-shaped and / or whisker-shaped.
  • the coated filler and the coating can be chosen as desired.
  • the tin oxide layer doped with antimony is advantageously made either by coating the fillers with an organic antimony-tin compound, which is then thermally calcined, or by introducing a hydrolyzable antimony and tin compound onto the filler in an aqueous filler dispersion applied.
  • the fillers coated in this way are commercially available.
  • Both glass fabric and fabric made from organic fibers can be considered as fabric material.
  • Organic fabrics made from aramid fibers and / or polyester fibers are usually used. Insofar as they are compatible with the requirements for insulating materials for, for example, high-voltage transformers, other organic types of fabric, for example based on polypropylene and / or fluorinated polymers, can also be used.
  • fabric types with a basis weight of 30 to 1000 g / m 2 are usually used.
  • binders such as, for example, alkyd resins, polyester resins, silicone resins and imide resins.
  • epoxy resins due to their balanced property profile with regard to dielectric properties, temperature stability and processing behavior as well as their good compatibility with the insulation system, epoxy resins have proven their worth.
  • aromatic glycidyl ethers have proven successful.
  • hardeners and / or accelerators the preferred amine compounds used in tapes. A certain flexibility of the not yet hardened tapes is necessary for problem-free processing in order to be able to wind them on the base without wrinkles and pockets. A slight inherent stickiness is also advantageous in order to be able to work with adhesive tapes without the additional fixing.
  • the semiconducting tapes according to the invention are produced by the methods customary for the production of insulating tapes. Binder solutions are used in which the semiconducting filler is dispersed. The viscosity and thus the application to the fabric material is determined by the concentration of the binder and the filler in the solution. The tissue materials are either pulled through the solution and / or sprayed with them as more or less wide bands. The belt then passes through a horizontal or vertical drying section at elevated temperature and / or in a gas stream to remove the solvent. The tape is then wound up.
  • the semiconducting tapes according to the invention described here can be used as equipotential bonding in the manufacture of high-voltage transformers. However, they can also be used in general in electrical machines, in particular high-voltage machines, transformers and chokes, if semiconducting layers with a defined surface resistance in the range between 1 and 100 k ⁇ / square are to be used for potential equalization.
  • a fabric tape is drawn as a carrier material at a defined speed through a container filled with the impregnation resin.
  • the impregnation Resin stock is continuously stirred before and during the test to prevent the conductive filler from settling.
  • Examples 1-6 mica coated with antimony-tin oxide was used as the electrically conductive filler.
  • the composition of the binders is summarized in Table 2. The meaning of the symbols are given in Table 1 for explanation.
  • a glass fabric tape (width 50 mm, thickness 0.2 mm, basis weight approx. 200 g / m 2 ) was used as the fabric material.
  • the preparation was carried out analogously to the above-described regulation.
  • the influence of the filler content on the electrical resistance of the tapes (examples 1-5) and the reproducibility of the results (example 1.6) can be seen.
  • the values given in brackets reflect the measurement results at various points on the belt and show the low scatter.
  • the resistance of the tapes is measured on a 50mm wide tape over a length of 50mm.
  • the test specimens (5 pieces / formulation) are each provided with two 10 mm wide and 50 mm long conductive silver electrodes, which are applied parallel to each other at a distance of 50 mm.
  • the conductive silver electrodes are contacted by means of crocodile clips and the respective surface resistance is measured with a multimeter (measuring voltage ⁇ 10V).
  • the tapes are cured in a laboratory oven for 5 hours at 130 ° C.
  • Example 1 As the repetition of Example 1 as Example 6 shows, a satisfactory reproducibility of the electrical strip properties can be assumed. There is also only a slight scatter in the electrical properties of the strip along the strip.

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Organic Insulating Materials (AREA)
  • Insulating Bodies (AREA)
  • Non-Insulated Conductors (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

L'invention concerne une bande d'enroulement semiconductrice, notamment une bande destinée à l'équilibrage de potentiel dans des transformateurs haute tension. La charge est choisie de telle manière qu'on obtient une bande semiconductrice lorsque la charge atteint sa concentration de saturation dans le liant. Les bandes ainsi obtenues présentent une bonne reproductibilité en ce qui concerne leur résistance spécifique.
EP05701637A 2004-02-04 2005-02-03 Bande semiconductrice contenant du mica revetu d'oxyde de zinc dope a l'antimoine et utilisation Withdrawn EP1711952A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004005548 2004-02-04
PCT/EP2005/050467 WO2005076290A1 (fr) 2004-02-04 2005-02-03 Bande semiconductrice contenant du mica revetu d'oxyde de zinc dope a l'antimoine et utilisation

Publications (1)

Publication Number Publication Date
EP1711952A1 true EP1711952A1 (fr) 2006-10-18

Family

ID=34832518

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05701637A Withdrawn EP1711952A1 (fr) 2004-02-04 2005-02-03 Bande semiconductrice contenant du mica revetu d'oxyde de zinc dope a l'antimoine et utilisation

Country Status (4)

Country Link
US (1) US20070173151A1 (fr)
EP (1) EP1711952A1 (fr)
CN (1) CN1918669A (fr)
WO (1) WO2005076290A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015213535A1 (de) 2015-07-17 2017-01-19 Siemens Aktiengesellschaft Fester Isolationswerkstoff, Verwendung dazu und damit hergestelltes Isolationssystem
JP6898062B2 (ja) * 2016-01-20 2021-07-07 日立金属株式会社 差動伝送用ケーブル及び多対差動伝送用ケーブル

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6043582A (en) * 1998-08-19 2000-03-28 General Electric Co. Stable conductive material for high voltage armature bars
DE19839285C1 (de) * 1998-08-28 2000-04-27 Siemens Ag Glimmschutzband

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005076290A1 *

Also Published As

Publication number Publication date
CN1918669A (zh) 2007-02-21
US20070173151A1 (en) 2007-07-26
WO2005076290A1 (fr) 2005-08-18

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