The fundamentals of dielectrics for high stress electrical insulation

Since solid dielectrics must be used in all electrical systems, ways and means must be secured to complement their shortcomings, particularly against gaseous ionization. With composites where high quality insulating liquids as generally used, particular care must be taken to eliminate voids which can cause ionization. Uniformity in a volume of dielectrics is essential to reduce high electrical stress in isolated spots which can easily lead to electrical failure. Exotic new dielectrics may seem solutions to high stress electrical insulation problems, but their use has not commanded high degree of satisfaction and means must be provided to eliminate their shortcomings. Since the presence of weak spots is usually the cause of failure, successive low vacuum-high pressure impregnation to eliminate voids seems the hest solution.