This review presents a selection of patents reported on coatings for high-voltage porcelain insulators. An
insulator is subject to surface corrosion due to air pollution or salt deposition, which may form a conductive electrolytic
solution. This may cause a flashover and shut down the transmission and distribution electrical energy line, particularly in
high polluted or coastal regions. The main goal of protective coatings has been to produce flashover-free high-voltage
insulators. Coating porcelain insulators with specific inorganic or organic may prevent the leakage current. Major
approaches are based either on semiconducting glazes or hydrophobic coatings.
Keywords: Coatings, films, glazes, hydrophobic, hydrophilic, insulators, photocatalytic, porcelain, semiconducting.
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