Abstract：In order to investigate the impact of temperature on the frequency domain dielectric spectrum of oil-paper insulation and to develop an effective frequency-temperature normalization method to mitigate test temperature errors induced by various environmental factors, this study employs a first-order differential mapping of the real part of the complex capacitance to categorize three types of relaxation intervals. It integrates the Kramers-Kronig(K-K) transform and the derivative equations of the Arrhenius model to examine the mechanism of multiple relaxation frequencies and temperature. Additionally, it proposes a frequency-temperature normalization approach to restore dielectric mapping at standard temperature. Aiming at the frequency domain dielectric testing of oil-paper insulation in the frequency domain of the mechanism is not clear, the insulation medium contains different relaxation between the activation energy difference is significant, resulting in the use of a single activation energy for the frequency and temperature shifting of the "master curve" method will cause a large error and other issues, this paper carries out the oil-paper insulation frequency and temperature mechanism and the study of the normalization. The following operations are carried out for the frequency domain dielectric data measured at two different temperatures, firstly, the K-K transformation is carried out on the real and imaginary parts of the complex capacitance data, and the geometric capacitance and conductivity contributions at different temperatures are normalized and fitted, and then, by means of the first-order differentiation of the real part of the polarized complex capacitance, the frequency point at the peak of the differentiation spectral line, the frequency point at the nearly temperature-independent peak dominated by high-frequency dipole polarization, are taken out as benchmarks to divide the low-frequency frequency and the high-frequency frequency. The low and middle frequency bands are then deconvolved to separate the different relaxations and calculate their relaxation time constants and relaxation activation energies. Finally, the characteristic quantities of the two sets of test data are brought into the Arrhenius derivative equation to obtain the frequency-temperature shift factor of each component, and then the frequency shift is performed to restore the frequency-domain dielectric spectra at the standard temperature. Through the analysis of actual experimental data, the effectiveness of the method is proven, leading to the following conclusions: (1) Unlike the traditional "master curve" method, the temperature normalization strategy proposed in this paper provides a rigorous explanation of the frequency-temperature mechanism. The normalization strategy, based on the analysis of the variability of multi-relaxation activation energies, is an effective approach to achieve high-precision correction of the maps. (2) The activation energies of the low-frequency relaxation region, the middle-low-frequency region, and the high-frequency relaxation region are obviously different. Among them, the activation energies of the middle and low-frequency relaxation regions also differ, showing a trend of gradually decreasing with increasing frequency. (3) The strategy proposed in this paper has good applicability to samples with different insulation aging states. At the same time, it is found that the activation energy for relaxation decreases with the degree of aging. This indicates that the sensitivity of various relaxation processes to aging conditions is not uniform, providing a solid theoretical foundation for future studies on diagnosing insulation aging.
邹阳, 黄煜, 方梦泓, 姚雨佳, 金涛. 基于微分解谱的油纸绝缘多弛豫频温机理与归一化研究[J]. 电工技术学报, 2025, 40(5): 1575-1586.
Zou Yang, Huang Yu, Fang Menghong, Yao Yujia, Jin Tao. Study on the Mechanism and Normalization of Multi-Relaxation Frequency Temperature of Oil-Paper Insulation Based on Microdecomposition Spectrum. Transactions of China Electrotechnical Society, 2025, 40(5): 1575-1586.
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