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SYLLABUS

Unit - 1 :

Over Voltages in Electrical Power Systems Causes of over voltages and its effects on power system – Lightning, Switching surges and temporary over voltages, Corona and its effects – Bewley lattice diagram – Protection against over voltages.

Unit - 2 :

Dielectric Breakdown Properties of dielectric materials – Gaseous breakdown in uniform and non-uniform fields – corona discharges – Vacuum breakdown – Conduction and breakdown in pure and commercial liquids, Maintenance of oil quality – Breakdown mechanisms in solid and composite dielectrics – Applications of insulating materials in electrical equipments.

Unit - 3 :

Generation of High Voltages and High Currents Generation of high DC voltage: Rectifiers, Voltage multipliers, Van de graaff generator: Generation of high impulse voltage: Single and multistage Marx circuits – Generation of high AC voltages: Cascaded transformers, Resonant transformer and tesla coil – Generation of switching surges – Generation of impulse currents – Triggering and control of impulse generators.

Unit - 4 :

Measurement of High Voltages and High Currents High resistance with series ammeter – Dividers, Resistance, Capacitance and mixed dividers – Peak voltmeter, Generating Voltmeters – Capacitance voltage transformers, Electrostatic voltmeters – Sphere gaps – High current shunts – Digital techniques in high voltage measurement.

Unit - 5 :

High Voltage Testing and Insulation Coordination High voltage testing of electrical power apparatus as per international and Indian standards – Power frequency, Impulse voltage and DC testing of insulators, Circuit breakers, Bushing, Isolators and transformers – Insulation coordination and testing of cabilitys.