Analysis of low‐frequency polarisation behaviour for oil‐paper insulation using logarithmic‐derivative spectroscopy

Liu, Jiefeng; Fan, Xianhao; Zhang, Yiyi; Lai, Benhui

doi:10.1049/hve2.12066

Cited by 22 publications

(22 citation statements)

References 27 publications

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“…In this paper, the 3D periodic amorphous structure of insulating oil with a density of 0.87 g/cm was built for molecular dynamics simulations. According to research [27], [29], the model of cellulose with a density of 1.5 g/cm 3 was built. Considering that methanol molecules are mainly produced by the aging of cellulose insulation, the methanol molecules are initially distributed in the model of cellulose.…”

Section: ) Paper-oil Interface Modelmentioning

confidence: 99%

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Investigation on Diffusion Mechanisms of Methanol in Paper/Oil Insulation Based on Molecular Dynamics Simulation

et al. 2021

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Methanol is regarded as an available indicator to analyze the aging condition of cellulose insulation. However, the diffusion mechanism of methanol molecules in the paper-oil insulation system is still unclear, since it cannot be explored by using only experiments. Given this issue, the molecular dynamics simulations were performed to investigate the diffusion mechanism of methanol molecules. In the current work, the mean square displacement of methanol during the diffusion process was calculated and analyzed, as well as its trajectory tracking. Then, the research on interaction energies and hydrogen bonds in paper/oil system were conducted. Finally, the effect of temperature on the diffusion of methanol molecules was also studied. Findings revealed that the diffusion of methanol in cellulose insulation is faster than that in insulating oil, besides, the presence of hydrogen bonds affects the diffusion rate of methanol molecules in cellulose insulation and insulating oil. Thus, the present findings could support the investigation of the diffusion mechanisms of methanol molecules, by which the aging condition evaluation of cellulose insulation could be also promoted.

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Section: ) Paper-oil Interface Modelmentioning

confidence: 99%

“…The service life of an oil-immersed transformer is determined by the performance of its paper insulation [1]- [3]. Due to the excellent electrical and mechanical properties, cellulose (crucial material of paper insulation) has been utilized in oilimmersed transformers for more than 100 years.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Diffusion Mechanisms of Methanol in Paper/Oil Insulation Based on Molecular Dynamics Simulation

et al. 2021

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“…Referring to Equations (12), (14), and (15), the formula of R ij and C ij can be calculated by the following matrix, where, in this simple case, i∈ (1,2), and j∈ (1,2).…”

Section: Modified Circuit Including the Impact Of Polarization And Comentioning

confidence: 99%

“…Also, the previous derivation is available for obtaining the formula of Y ij corresponding to Figure 6, in which the parameter i∈ (1,2), and j represents the total number of layers, and j∈ (1, n). Equations (27) and (28) describe the general formula of Y ij .…”

Section: Mathematical Formula Of Modified Xy Model Including the Non-mentioning

confidence: 99%

A modified XY model of transformer oil–paper insulation system including non‐uniform aging and conductance effect

Fan

Liu

Zhang

et al. 2021

IET Generation Trans & Dist

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The accuracy and feasibility of the traditional XY model of transformer oil-paper insulation system are disputable since it ignored the effect of non-uniform aging and conductance on dielectric response property. Given this issue, this work attempted to report a modified XY model to overcome these defects. The novelty of this work is in the exploration of the modified XY model as a potential tool for establishing the quantitative correlation among the complex relative permittivity of the liquid insulation, solid insulation, and liquid-solid composite insulation. In that respect, the presented verification experiments proved the feasibility and accuracy of the reported model. The contributions are expected to provide a theoretical basis for the condition evaluation of transformer solid insulation under non-uniform aging conditions.

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“…Due to the traction load's particularity, the traction transformer internal temperature field variation law is different from the power transformer. Thus, insulation aging is also different from that of the power transformer [17], [18]. Based on the equivalent thermal circuit [19], [20] and the parameter optimized equivalent thermal circuit [21]- [23], many scholars have discussed the transformer modeling problem considering load characteristics.…”

Section: Introductionmentioning

confidence: 99%

A Prediction Model of Hot Spot Temperature for Split-Windings Traction Transformer Considering the Load Characteristics

et al. 2021

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Hot spot temperature (HST) is an important parameter reflecting the working state of the traction transformer, and the load characteristics have a great influence on the HST. The current researches rarely consider the load characteristics of transformers in-depth, and most of the research on the temperature field focuses on steady load. Therefore, a prediction model of HST for the traction transformer considering the load characteristics is established by the finite element simulation in this paper. Considering the impact and nonlinearity of traction load, the influence of the load characteristics on the HST is studied. Analysis of the load curve revealed that the steady and step load combination could well simulate the traction load. Based on the analysis of traction transformer load characteristics, the temperature field coupling calculation of traction transformer is carried out according to the VI normative duty class. On this basis, the influence of load rate and time on HST is studied. The present findings show that the method can predict the HST of traction transformer under different working conditions and provide a reference for load dispatching of traction transformer. The simulation data are in good agreement with the test results, and the average relative error is 3.4%. The results verify the effectiveness of the proposed method.INDEX TERMS Traction transformers, hot spot temperature, load characteristics, temperature field analysis, finite element simulation.

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Analysis of low‐frequency polarisation behaviour for oil‐paper insulation using logarithmic‐derivative spectroscopy

Cited by 22 publications

References 27 publications

Investigation on Diffusion Mechanisms of Methanol in Paper/Oil Insulation Based on Molecular Dynamics Simulation

Investigation on Diffusion Mechanisms of Methanol in Paper/Oil Insulation Based on Molecular Dynamics Simulation

A modified XY model of transformer oil–paper insulation system including non‐uniform aging and conductance effect

A Prediction Model of Hot Spot Temperature for Split-Windings Traction Transformer Considering the Load Characteristics

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