电力变压器油纸绝缘含水量定量评估的时域介电特征量

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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(K_p) and stable polarization charge quantity(Q_p-5000) which can predict the moisture content in oil-impregnated pressboards are proposed. Results show that K_p and Q_p-5000 are very sensitive to moisture content in pressboards. There are the exponential relations between K_p & Q_p-5000 and moisture content in pressboards, therefore, K_p & Q_p-5000 can be used to quantitatively assess the moisture content in transformer oil-paper insulation.

Key words： Power transformer oil-paper insulation polarization and depolarization current(PDC) extended Debye model polarization charge quantity slope stable polarization charge quantity

Received: 23 August 2013 Published: 14 April 2015

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