Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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Effects of the Insulation Quality on the Frequency Response of Power Transformers

  • Abeywickrama Nilanga (Division of High Voltage Eng., Dept. of Materials and Manufacturing Technology, Chalmers University of Technology) ;
  • Ekanayake Chandima (Dept. of Electrical and Electronic Engineering, Faculty of Engineering, University of Peradeniya) ;
  • Serdyuk Yuriy V. (Division of High Voltage Eng., Dept. of Materials and Manufacturing Technology, Chalmers University of Technology) ;
  • Gubanski Stanislaw M. (Division of High Voltage Eng., Dept. of Materials and Manufacturing Technology, Chalmers University of Technology)
  • Published : 2006.12.01
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Abstract

This paper presents results of frequency domain spectroscopy (FDS) measurements on oil-impregnated pressboard insulation, their analyses and use of the data for modeling high frequency response (FRA) of transformers. The dielectric responses were measured in a broad frequency range, i.e. from 0.1 mHz to 1 MHz, on model samples containing different amount of moisture. The responses were parameterized with terms representing dc conductivity, low frequency dispersion and Cole-Cole polarization mechanisms and they were thereafter used to model the FRA response of a three-phase transformer.

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References

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  2. C. Ekanayake, 'Diagnosis of moisture in transformer insulation - Application of frequency domain spectroscopy', Ph.D. thesis, ISBN 91-7291-727-X, Chalmers University of technology, Gothenburg, Sweden 2006
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  2. Understanding the dielectric properties of pressboard material thermally aged in Dibenzyl Disulphide (DBDS) included transformer oil vol.24, pp.1, 2017, https://doi.org/10.1109/TDEI.2016.006083
  3. Influence of temperature and moisture content on frequency response analysis of transformer winding vol.21, pp.3, 2014, https://doi.org/10.1109/TDEI.2014.6832288
  4. Examining the ageing of transformer insulation using FRA and FDS techniques vol.22, pp.2, 2015, https://doi.org/10.1109/TDEI.2015.7076829
  5. A method to estimate activation energy of power transformer insulation using time domain spectroscopy data vol.24, pp.5, 2017, https://doi.org/10.1109/TDEI.2017.006640