变压器油纸绝缘含水量定量评估的频域介电特征参量研究

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Abstract The insulating property of transformer oil-paper insulation is greatly influenced by moisture. In order to better apply frequency domain spectroscopy (FDS) to nondestructive quantitative assessment of moisture content in transformers, and reliably forecast its insulation state and remaining life, the oil-paper insulation samples with different moisture contents are first prepared, and then the frequency dielectric properties of these samples are tested at 30°C and 50°C. To obtain the insulation information contained in relative permittivity(ε^*_r), the integral of real part (S_RP) and the integral of imaginary part (S_IP) of relative permittivity in their respective frequency ranges are proposed as characteristic parameters for assessing the moisture content in cellulose insulation based on analysis about the influence of moisture and temperature on ε^*_r. The quantitative relationships between moisture content and characteristic parameters are initially presented. Finally, the impacts of temperature on FDS results are eliminated by introducing the “frequency shift of FDS”. Results show that in 10^-3~10^-1Hz, the S_RP obviously increases with the increasing of moisture content in pressboards, while S_IP present the similar tendency in 10^-1~10¹Hz. Master curve formed by “frequency shift of FDS” could eliminate the temperature effect on FDS and therefore improve the reliability of moisture content assessment.

Key words： Power transformer oil-paper insulation moisture content characteristic parameters quantitative assessment

Received: 05 September 2013 Published: 23 March 2015

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