Unit 1
Introduction: different types of dielectrics, uniform and non-uniform electric field, electric field in some geometric boundaries.
Conduction and breakdown in gases: Collision process, ionization process, Townsend’s theory, streamer theory, Pashen’s law, breakdown in non-uniform fields and corona discharges – Vacuum insulation.
Conduction and breakdown in liquid dielectrics; Classification of liquid dielectrics, breakdown in liquid dielectric. Different types of solid dielectric materials – breakdown in solid dielectrics – field configuration in the presence of voids.
Breakdown in composite dielectric.