Effect of solid and contaminants in gaseous insulation

Solid and gaseous dielectrics are both used for electrical insulation, either singly or in combination. Where solid is used as a major component, the detrimental effect of gases, such as air voids, has been discussed at length by various investigators. However, little has been reported on the effect of solid materials to the gaseous insulation. With the recent uprising trend of using gaseous dielectrics as a major insulation in cables, transformers and electronic equipment, it appears timely to examine the effect of solid insulation and contaminants that are often encountered in such equipment.