Prediction method for furfural content in transformer insulating oil based on frequency domain complex dielectric constant initial slope

Abstract

The invention relates to a prediction method for furfural content in transformer insulating oil based on frequency domain complex dielectric constant initial slope. The method includes the steps of: 1, putting forward an initial slope k of a complex dielectric constant real part frequency domain curve to analyze the transformer insulation aging degree; 2, setting up an experimental platform in a laboratory, employing a three-electrode device to replace a transformer model, performing accelerated thermal aging to prepare aging samples with different furfural content so as to explore the relationship between the initial slope k of complex dielectric constant real part frequency domain curve and oil paper insulation aging degree; 3, performing analysis according to the experimental data result and combining the dielectric theory to conclude that k is used for analyzing the insulation aging degree and is related to interlayer polarization and dipole polarization process, and acquiring thefitting relation between the absolute value of k and Cq, i.e. |k|=15770Cq-2339. The relation indicates that the smaller the |k| is, the better the transformer insulation state is. The complex dielectric constant initial slope k put forward by the invention can well evaluate the transformer aging degree, tedious oil extraction operation is unnecessary, and uncertain damage to the transformer insulation structure in the oil extraction process can be avoided.

Description

technical field [0001] The invention belongs to the field of insulation state diagnosis and life evaluation of oil-paper insulated power equipment, and in particular relates to a method for predicting furfural content in transformer insulating oil based on the initial slope of complex dielectric constant in the frequency domain. Background technique [0002] As the core of energy conversion in the process of power transmission and distribution, power transformers are key equipment to ensure the safe operation of the power grid. Failure of transformer operation will cause huge direct and indirect economic losses, seriously affecting people's lives and social production. Transformer faults caused by internal insulation failure account for an important part of its operating faults. The inner insulation of the transformer is mainly composed of composite insulation composed of mineral oil and fiber paper. During operation, it is affected by factors such as electricity, heat, mach...

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Problems solved by technology

[0004] Compared with other characteristic quantities such as dielectric loss, there is almost no research on the initial slope characteristic quantity of the real part of complex capacitance, and most of the researches at home and abroad are dealing with the problem of moisture aging of oil-paper insulation qualitatively, and there are few quantitative ones. evaluation method

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