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.
Generation of high voltages - ac voltages, dc voltages, impulse voltages. Generation of impulse currents.
Measurement of high voltages and currents - High DC, AC and impulse voltages, Direct, Alternating and Impulse currents.
Non-destructive insulation test techniques, measurement of insulation resistance under dc voltage, measurement of loss angle and capacitance, partial discharge measurement.
Testing of high voltage apparatus based in International and Indian standards - non-destructive testing - testing of insulators – bushings – cables - isolators and circuit breakers – transformers - surge arresters.