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Effect of Different Dielectric Coatings in Divergent Fields

  • Silvio Stangherlin
  • Christian Rein
  • Gerhard Salge
  • Friedrich Koenig

Abstract

Dielectric coatings are widely used in electric power equipment to increase the breakdown voltage and to reduce the insulation distance.

Two different coating materials, epoxy and polyamide, and two different coating thicknesses, 3 and 5 mm, were experimentally investigated in divergent field gaps (coated rod — bare plane arrangements). The experimental campaign was performed in air at 100 kPa.

Previous measurements referring to bare electrodes, under the same experimental conditions, have been used as reference for calculating the increase in the breakdown voltage U50% as well as modification in the standard deviation σ.

The streamer inception model was also used to work out predictions of the breakdown voltage.

Discrepancies as well as similarities are put in evidence and discussed in the conclusions.

Keywords

Coating Thickness Coating Material Breakdown Voltage Positive Polarity Dielectric Coating 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    H. Roser, Schrime zur Erhörung der Durchschlags-Spannung in Luft, Elektrotechnische Zeitschrift B17, 411–412 (1932).Google Scholar
  2. 2.
    H. EI-Haéry, Ladungsverteilung auf Isolierschirmen im inhomogenen Feld bei Stossbeanspruchung, Ph. D. Thesis, University Stuttgart, (1981).Google Scholar
  3. 3.
    L. Ming, M. Leijon, T. Bengtsson and M. Darveniza, Barrier effects in a rod/rod air-gap under DC voltage, in: Gaseous Dielectrics VII, edited by L. G. Christophorou and D. R. James (Plenum Press, New York, 1994), 169–175.Google Scholar
  4. 4.
    G. Baldo and G. Pesavento, Impulse performance of air gaps in series with thick insulating layers, 5 th International Symposium on High Voltage Engineering 1, 14.25 (1987).Google Scholar
  5. 5.
    L. Ming, U. Fromm, M. Leijon, D. Windmar, L. Walfridsson, A. Vlastos, M. Darveniza and J. Kucera, Insulation performance of covered rod/plane air-gap under lightning impulse voltage, 10 th International Symposium on High Voltage Engineering 3, 235–238 (1997).Google Scholar
  6. 6.
    S. Stangherlin, G. Salge and F. Koenig, Measurements of discharges and their branching behaviour in atmospheric air, 2002 Conference on Electrical Insulation and Dielectric Phenomena, 782–785 (2002).Google Scholar
  7. 7.
    W. Hauschild and W. Mosch, Statistical techniques for high voltage engineering (Verlag Techniques, Berlin, 1984).Google Scholar
  8. 8.
    S. Stangherlin, G. Salge and F. Koenig, Dielectric behaviour of compressed N2-O2 gas mixtures in a slightly divergent field, 14th International Conference on Gas Discharges and their Applications, 239–242 (2002).Google Scholar
  9. 9.
    G. Friedrich, Ph. D. Thesis ETH N. 9992 (1992).Google Scholar
  10. 10.
    N. L. Allen and A. Ghaffar, The conditions required for the propagation of a cathode-directed positive streamer in air, J. Phys. D: Appl. Phys. 28, 331–337 (1995).ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2004

Authors and Affiliations

  • Silvio Stangherlin
    • 1
  • Christian Rein
    • 2
  • Gerhard Salge
    • 1
  • Friedrich Koenig
    • 1
  1. 1.ABB Switzerland Ltd., Corporate ResearchBaden-DaettwilSwitzerland
  2. 2.ABB AS, Power Technology DivisionSentrum, SkienNorway

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