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The frequency domain dielectric response method has been one of the most effective approaches for the condition assessment of transformers. The low frequency part is more effective for diagnosing the moisture content and aging status of oil-paper insulation, which reflects the individual properties of the oil and the cellulose material. To facilitate the study of the low frequency dielectric spectrum...
Because the temperature and load of transformer are variable, the moisture is usually inhomogeneous in oil-paper, especially for the traction transformer. In order to research the dielectric relaxation behavior of the oil-paper composite insulation with an inhomogeneous moisture distribution, it was proposed that a theoretical model for dielectric medium with an arbitrary distribution of conductivity...
The research on dielectric frequency response of oil-paper composite insulation modified by nanoparticles has been carried out in order to seek possible way to improve insulation properties thereof. Before and after nanoparticles being added, the dielectric frequency responses of oil-paper composite insulation with different moisture contents at different temperatures have been measured within the...
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