Permittivity of a composite of cellulose, mineral oil, and water nanoparticles: theoretical assumptions

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• 作者：P. Żukowski ; T. N. Kołtunowicz ; K. Kierczyński ; P. Rogalski ; J. Subocz…
• 关键词：FDS ; Electric insulation pressboard ; Moisture content ; Permittivity ; Relaxation time ; Activation energy ; Reference temperature
• 刊名：Cellulose
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：23
• 期：1
• 页码：175-183
• 全文大小：1,431 KB
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• 作者单位：P. Żukowski (1)
  T. N. Kołtunowicz (1)
  K. Kierczyński (1)
  P. Rogalski (1)
  J. Subocz (2)
  M. Szrot (3)
  M. Gutten (4)
  M. Sebok (4)
  J. Jurcik (4)
  
  1. Department of Electrical Devices and High Voltages Technology, Faculty of Electrical Engineering and Computer Science, Lublin University of Technology, 38a, Nadbystrzycka Street, 20-618, Lublin, Poland
  2. Department of Electrotechnology and Diagnostics, West Pomeranian University of Technology, 37 Sikorskiego Street, 70-313, Szczecin, Poland
  3. Power Engineering Research Centre Ltd., 9 Lotników Street, 41-949, Piekary Śląskie, Poland
  4. Department of Measurement and Applied Electrical Engineering, University of Zilina, 1 Univerzitna Street, 010 26, Zilina, Slovakia
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Bioorganic Chemistry
  Physical Chemistry
  Organic Chemistry
  Polymer Sciences
  
• 出版者：Springer Netherlands
• ISSN：1572-882X

文摘

The paper presents results of testing permittivity of an oil-impregnated electric pressboard containing water nanoparticles depending on AC frequency, moisture content level and the temperature of samples. A new method has been developed for converting experimentally obtained frequency dependences of permittivity determined with the frequency-domain spectroscopy (FDS) to the reference temperature of 293 K (20 °C) using exponential dependence of the relaxation time versus temperature. Activation energy of the permittivity relaxation time has been determined for a moist oil-impregnated electric insulation pressboard. It has been established that variations of the moisture content level in a composite of cellulose, mineral oil, and water nanoparticles do not cause any changes in the relaxation time activation energy value, neither in energy states of electrons in potential wells nor in the structure of water nanoparticles. It has been also found that the conversion of experimentally obtained permittivity versus frequency dependences determined with the FDS method to the reference temperature of 293 K (20 °C) eliminates temperature dependences that occur in characteristics based directly on measurement results. Once the relative permittivity is converted to the reference temperature it is only its dependence on the moisture content level that remains. Keywords FDS Electric insulation pressboard Moisture content Permittivity Relaxation time Activation energy Reference temperature