Study on Temperature Characteristics of Frequency -domain Dielectric Spectrum of Capacitive Oil-paper Insulation Bushing Based on Extended Debye Model

2nd International Conference on Design, Materials, and Manufacturing

材料科学;机械制造

Xu, X.W.^1 ; Pan, G.^2 ; Wang, K.^1 ; Liu, W.D.^2

Yunnan Electric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming

650217, China^1

College of Electrical Engineering, Southwest Jiaotong University, Chengdu

610031, China^2

关键词: Dielectric spectra;    Equivalent circuit model;    Frequency domain spectroscopies (FDS);    Frequency domains;    Insulation resistance;    Oil paper insulation;    Oil-paper insulation system;    Temperature characteristic;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/220/1/012030/pdf
DOI  :  10.1088/1757-899X/220/1/012030

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In order to study the influence of temperature on the frequency domain spectroscopy (FDS) of the oil-paper insulation system, the 72.5kV bushing test model was fabricated according to the actual size, and the FDS of the bushing was tested at different temperatures. According to the test curves of the dielectric constant at different temperatures, the influence of temperature on FDS is analysed, and then the extended Debye equivalent circuit model is used to fit the FDS test curves at different temperatures. The characteristic parameters that could be used to characterize the temperature characteristics are extracted, and the relationship between the characteristic parameters and the temperature is established. The results show that dielectric constant tend to move in the high frequency with the increase of temperature. The parameters of the equivalent circuit model are sensitive to the temperature, the insulation resistance Rgand the maximum time constant branch parameter R1show the exponential function with the temperature, the minimum time constant branch parameter R3and the temperature show a power function relationship, so the variation of characteristic parameters can be applied to evaluate the influence of temperature on the FDS of the oil-paper insulation bushing.