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Oil impregnated paper in power transformers deteriorates in long-term operation, which leads to the variations of its dielectric characteristics. This paper focuses on investigating the generation mechanism of the dielectric processes in oil impregnated paper and their variations with thermal aging. Firstly, a set of thermally stimulated current tests with bias-voltages were conducted in distinguishing...
Trap and polarization greatly affect dielectric breakdown and surface flashover behavior of insulating materials. Trap and polarization may be modified by electron beam irradiation via breaking polymeric molecular chains or triggering cross-linking. Polyethylene terephthalate (PET) with a thickness of 75 μm from DuPont was used to investigate the modifications of trap and polarization by electron...
Considering the response of free charges to high frequency alternating current (AC) electric field and multiemission and capture processes of weakly bound charges, dielectric relaxation effect of free carriers are proposed in this paper. According to this model, free charges and bound charges are regarded as the same except for the difference in transport distance, which is defined by the frequency...
Many papers reported that the effective permittivity of nanodielectrics decreased slightly by incorporating of small amount of nanoparticles, and increased at high nanoparticle loadings. The reduction of permittivity was close related to the molecular chains movements, chemical and physical interactions and polarization effects in interfacial region. This paper simulated the effective permittivity...
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