Abstract
Surface discharge of insulating materials is the main form of insulation failure of electrical equipment under special operating environment such as high humidity, high pollution and easy condensation. Therefore, it is of great significance to study the discharge initiation characteristics of wet insulated material surface to improve the operation reliability of electrical equipment. In this paper, the discharge initiation characteristics of insulating materials under the action of condensation and pollution were studied. Firstly, COMSOL software was used to construct a single droplet model under the action of a flat electrode, and FEM was used to calculate the electric field distribution on and around the surface. Secondly, a method for predicting the initial voltage of surface discharge of wet insulation materials based on photoionization criterion is proposed. Finally, the corona test was carried out on the surface of the wet epoxy resin plate, and the corresponding corona voltage was calculated by the leakage current method. The results show that the error between the experimental value and the simulation value is small, which verifies the validity of the method for predicting the negative polarity DC corona initial voltage.
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