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Time Domain Dielectric Characteristics for Quantitative Assessment of Moisture Content in Transformer Oil-Paper Insulation
Author(s): 
Pages: 196-203
Year: Issue:  2
Journal: Transactions of China Electrotechnical Society

Keyword:  Power transformeroil-paper insulationpolarization and depolarization current(PDC)extended Debye modelpolarization charge quantity slopestable polarization charge quantity;
Abstract: Moisture is an important factor which can degrade the property of transformer oil-paper insulation. To predict the moisture content in transformer main insulation system, and thus effectively forecast its insulation condition and remaining life, in this paper, the moisture content presented in oil-paper insulation was investigated in detail by using polarization and depolarization current(PDC) technique. Firstly, several oil-impregnated pressboards with different moisture contents are prepared in laboratory conditions, and then the PDC results on oil-impregnated pressboards was simulated by using Matlab software to obtain the parameters of extended Debye model. Finally, two time domain dielectric characteristics—polarization charge quantity slope(Kp) and stable polarization charge quantity(Qp-5000) which can predict the moisture content in oil-impregnated pressboards are proposed. Results show that Kp and Qp-5000 are very sensitive to moisture content in pressboards. There are the exponential relations between Kp & Qp-5000 and moisture content in pressboards, therefore, Kp & Qp-5000 can be used to quantitatively assess the moisture content in transformer oil-paper insulation.
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