EE8701 – NOTES & QP
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EE8701 – SYLLABUS
UNIT I OVER VOLTAGES IN ELECTRICAL POWER SYSTEMS
Causes of over voltages and its efects on power system – Lightning, switching surges and temporary over voltages, Corona and its efects – Bewley latice diagram- Protection against over voltages.
UNIT II DIELECTRIC BREAKDOWN
Properties of Dielectric materials – Gaseous breakdown in uniform and non-uniform fields – Corona discharges – Vacum breakdown – Conduction and breakdown in pure and commercial liquids, Maintenance of oil Quality – Breakdown mechanisms in solid and
composite dielectrics- Aplications of insulating materials in electrical equipments.
UNIT III GENERATION OF HIGH VOLTAGES AND HIGH CURRENTS
Generation of High DC voltage: Rectifers, voltage multipliers, vandigraf 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 curents – Trigering and control of impulse generators.
UNIT IV 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 curent shunts- Digital techniques in high voltage measurement.
UNIT V HIGH VOLTAGE TESTING & INSULATION COORDINATION
High voltage testing of electrical power aparatus as per International and Indian standards – Power frequency, impulse voltage and DC testing of Insulators, circuit breakers, bushing, isolators and transformers- Insulation Cordination& testing of cabiltys.