Growth Characteristics of Plasma Electrolytic Oxidation Ceramic Insulating Film on the Surface of High-Temperature Resistant Wire

With the increasing demand for transformer overload capacity in high percentage renewable energy power grids, higher requirements for high temperature resistance and high thermal conductivity of insulating materials for transformer windings have been put forward. However, most of the existing researches have achieved the homogenization of ceramic film by longer oxidation time, and the homogeneity of ceramic film produced by short-time oxidation is poor, which cannot meet the voltage resistance requirements of transformer windings. In response to this need, the aim is to study the uniform growth in different timing and spatial location environments. For the longitudinal growth characteristics of the film under different oxidation time and the lateral growth characteristics under different spatial positions, the growth process of the ceramic film is explained from both time and space dimensions. The growth and insulation characteristics of plasma electrolytic oxidation ceramic aluminum foil film are investigated and applied to dry-type transformers. The research in this paper provides a theoretical basis and engineering guidance for the development and application of ceramic insulated conductors in power equipment.