Conditions for Forming Porous Oxide Coatings Suppressing Corona Discharge during Transmission of Electricity through Power High-Voltage Wires

Porous nonmetallic inorganic coatings formed via pulsed microplasma oxidation of A5E aluminum wire used in steel–aluminum wires were developed. The coatings decrease the power losses due to corona discharge from 80 to 20% and increase the voltage of corona discharge during transmission of electricity through high-voltage power wires. The following five most important parameters of these coatings were identified: thickness, porosity, pore diameter, wettability, and dielectric loss tangent. The methodology was developed for rapid assessment of the effectiveness of corona-discharge suppression by coatings based on the dielectric loss tangent.