Characteristics evaluation of the Partial Arc Discharge and the Silicone Rubber surface by Dynamic Drop Test

This paper describes the results of experiments made to examine characteristics of hydrophobicity of ATH-filled silicone rubber specimen surface. As the examination method, we used a dynamic drop test (DDT), in which electrolyte solution droplet from an electrode continuously dropped on a sample and the AC voltage was supplied between electrodes. Hydrophobicity loss times of samples for various conductivities of electrolyte solutions were measured. The electric fields before and after hydrophobicity reduction were evaluated. The results showed that the hydrophobicity loss time became short with the increase of conductivity and the electric field increased after hydrophobicity reduction.