变压器油纸绝缘频域介电特征量与绝缘老化状态的关系

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Abstract In order to better apply frequency domain dielectric spectroscopy(FDS) in non- destructive diagnosis of transformer aging status, frequency domain dielectric characteristic quantity of the oil-paper insulation sample with different aging status are tested by FDS. The law of relative permittivity, dielectric loss factor, capacitance and volume conductivity of the oil-paper insulation sample changing with frequency and insulation paper aging status are analyzed. The temperature effects on frequency domain dielectric characteristic quantity of the oil-paper insulation sample are studied and a new method to calculate the activation energy of insulation paper is proposed. The results show that the frequency domain dielectric characteristic quantity of the oil-paper insulation sample in 10^-3～10⁰Hz can reflect the aging status of insulation paper. There is a secondary polynomial function between the values of C(DP_t) or ε_r(DP_t) at 10^-3Hz, 10^-2Hz, 10^-1Hz and the polymerization degree difference (DP₀-DP_t) of the insulation paper. The paper activation energy calculated by tanδ curves of oil-immersed paper insulation sample (DP=880) is 96.65KJ/mol. The temperature impact on the FDS results can be solved by using the “frequency temperature shift factor” to calculate the FDS results at different temperatures.

Key words： Frequency domain dielectric spectroscopy transformer oil-paper insulation aging status temperature activation energy

Received: 25 May 2010 Published: 20 March 2014

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TM835

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	Liao Ruijin
	Hao Jian
	Yang Lijun
	Yuan Quan
	Tang Chao

Cite this article:

Liao Ruijin,Hao Jian,Yang Lijun等. Relationship Between Frequency Domain Dielectric Characteristic Quantity and Aging Status of Transformer Oil-Paper Insulation[J]. Transactions of China Electrotechnical Society, 2012, 27(5): 43-49.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I5/43

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