Research on the characterization of hydrophobic surface condensation morphology of insulating materials and its influence on discharge development based on image recognition
Condensation is one of the main hazards that cause insulation deterioration or damage to electrical equipment and affect the safe and stable operation of the power system.Under the same dewing condition,the dews produced on different surfaces have different morphologies and different influences on their discharge development.The article proposes a characterization method based on image recognition for the characteristic morphology parameters such as wet area ratio and average contact area of condensation to characterize the sound emitted along the surface.Three test samples coated with different hydrophobic coatings were used for hydrophobicity testing.On the basis of analyzing and measuring the surface hydrophobicity of different samples,the development process and distribution law of condensation droplets on different hydrophobic surfaces were studied through relevant experiments,And the influence of condensation morphology parameters on flashover voltage was analyzed.The results showed that the static contact angles on the surfaces of CSS coating,P-EL88 coating,and uncoated samples were 103.17 °,91.60 ° and 80.77 °,respectively.At a significant level of 0.01,the Pearson correlation coefficients of the wet area ratio and the average contact area of droplets on the condensation flashover voltage were-0.989 and-0.696,respectively.The condensation flashover voltage was jointly affected by the wet area ratio and the average contact area of droplets.
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