Prevention of Partial Discharges in the Solid Insulation of High-Voltage Current Lines

Abstract: In this paper, we show the effect of partial discharges in gas inclusions on the short- and long-term electric strength of cast epoxy insulation. The effect of the characteristics of the technological process of manufacturing current lines on the development of these defects is revealed. The most effective ways to improve the adhesion of epoxy compounds and cast current-carrying elements are experimentally studied and identified. Regularities of the influence of technological factors on the adhesion and autohesion of cast polymer insulation containing internal current-carrying elements as applied to the conditions of their operation in high-voltage current lines are revealed. Specific technical solutions to improve the adhesion and autohesion of epoxy compounds and to eliminate gas inclusions in cast insulation, leading to an increase in the dielectric strength and reliability of high-voltage current lines with cast insulation, are substantiated. Such technical solutions are emphasized to be necessary in the development of high-voltage current lines for a rated voltage of 20 kV and above. © 2021, Allerton Press, Inc.