Study on Influence of the Hydrophobicity on AC Flashover Characteristics in Contaminated Solid Dielectrics

摘要

In the operating environment of the power equipment, the contamination of solid insulating materials such as BMC(Bulk Molding Compound), PC(PolyCarbonate) and Epoxy is inevitable. Under the pollution circumstance, the surface of these polymeric materials becomes less hydrophobic. In this paper, the surface flashover characteristics of the artificially contaminated solid insulating materials were investigated in paralleled electrodes, to analyze the correlation between the hydrophobicity and the surface flashover strength under the contaminated conditions. First of all, the contact angle of the surface with the several pollution severities was measured. Secondly, the surface flashover strength and the surface flashover propagation patterns of the contaminated surface were examined, varying with materials. Based on these experimental results, the surface flashover strength was analyzed as a function of the contact angle. Lastly, the influence of the hydrophobicity on the surface flashover characteristics of the micro ATH blended BMC was investigated. These experimental results are thought to be helpful in the surface design of solid dielectrics, considering the pollution.