1.Introduction.Arid climate,abundant sand particles,and flat terrain (or basins) are the fundamental conditions for the formation of deserts (sandy fields).Approximately 20×10~6 km^(2) of the Earth’s surface is ...1.Introduction.Arid climate,abundant sand particles,and flat terrain (or basins) are the fundamental conditions for the formation of deserts (sandy fields).Approximately 20×10~6 km^(2) of the Earth’s surface is covered by deserts (Wu et al.,2022;Chen et al.,2023) (Figure 1),with deserts in Asia and Africa having the largest areas,accounting for over 70% of the global deserts.展开更多
The adhesion of carbon particles on the surface of epoxy resin in insulating oil is a significant factor contributing to surface flashover.However,there is currently a lack of a dynamic model that can reasonably expla...The adhesion of carbon particles on the surface of epoxy resin in insulating oil is a significant factor contributing to surface flashover.However,there is currently a lack of a dynamic model that can reasonably explain the adhesion process of impurity particles,and the characteristics of particle adhesion are not yet clear,making it difficult to assess the risks of insulation contamination and surface flashover of valve-side bushing capacitance core.In this study,based on the Johnson-Kendall-Roberts(JKR)theory and the normal distribution characteristics of particle charges,the adhesion probability model of conductive particles in insulating oil on the surface of epoxy resin under DC electric fields was established,and carbon particle adhesion experiments were conducted to verify the accuracy of the model.The impact of electric field intensity,particle size,particle charge,and surface energy of the insulation material on the adhesion characteristics of carbon particles was investigated using the proposed model.The results can be utilised for the assessment of insulation contamination risks of valve-side bushing capacitance core and serves as a vital theoretical foundation for guiding the optimisation of anticontamination structures in internal insulation and the development of advanced pollution-resistant and flashover-resistant insulation materials.展开更多
基金supported by the National Natural Science Foundation of China (41920104005,42494914)。
文摘1.Introduction.Arid climate,abundant sand particles,and flat terrain (or basins) are the fundamental conditions for the formation of deserts (sandy fields).Approximately 20×10~6 km^(2) of the Earth’s surface is covered by deserts (Wu et al.,2022;Chen et al.,2023) (Figure 1),with deserts in Asia and Africa having the largest areas,accounting for over 70% of the global deserts.
基金National Natural Science Foundation of China,Grant/Award Number:52077012。
文摘The adhesion of carbon particles on the surface of epoxy resin in insulating oil is a significant factor contributing to surface flashover.However,there is currently a lack of a dynamic model that can reasonably explain the adhesion process of impurity particles,and the characteristics of particle adhesion are not yet clear,making it difficult to assess the risks of insulation contamination and surface flashover of valve-side bushing capacitance core.In this study,based on the Johnson-Kendall-Roberts(JKR)theory and the normal distribution characteristics of particle charges,the adhesion probability model of conductive particles in insulating oil on the surface of epoxy resin under DC electric fields was established,and carbon particle adhesion experiments were conducted to verify the accuracy of the model.The impact of electric field intensity,particle size,particle charge,and surface energy of the insulation material on the adhesion characteristics of carbon particles was investigated using the proposed model.The results can be utilised for the assessment of insulation contamination risks of valve-side bushing capacitance core and serves as a vital theoretical foundation for guiding the optimisation of anticontamination structures in internal insulation and the development of advanced pollution-resistant and flashover-resistant insulation materials.
