6EE2 HIGH VOLTAGE ENGINEERING

Unit-1 (i) Breakdown in Gases: Introduction to mechanism of breakdown in gases, Townsend’s breakdown mechanism. Breakdown in electromagnetic gases, Application of gases in power system.
(ii) Breakdown in Liquids: Introduction to mechanism of breakdown in liquids, suspended solid particle mechanism and cavity breakdown. Application of oil in power apparatus.
(iii) Breakdown in solids: Introduction to mechanism of breakdown in solids, electromechanical breakdown, treeing & tracking breakdown and thermal breakdown.
Unit-2 (i) High DC Voltage Generation: Generation of high dc voltage, basic voltage multiplier circuit.
(ii) High AC Voltage Generation: Cascaded Transformers.
(iii) Impulse Voltage generation: Impulse voltage, basic impulse circuit, Mark’s multistage impulse generator.
(iv) Measurement of High Voltage: Potential dividers - resistive, capacitive and mixed potential dividers. Sphere gap- Construction and operation. Klydonorgraph.
Unit-3 Nondestructive Insulation Tests: (i) Measurement of resistively, dielectric constant and loss factor. High Voltage Schering Bridge- measurement of capacitance and dielectric loss.
(ii) Partial Discharges: Introduction to partial discharge, partial discharge equivalent circuit. Basic wide-band and narrow band PD detection circuits.
Unit-4 (i) Over voltages: Causes of over voltages, introduction to lightning phenomena, over voltages due to lighting.
(ii) Travelling Waves: Travelling waves on transmission lines-open end line, short circuited line, line terminated through a resistance, line connected to a cable, reflection and refraction at a T-junction and line terminated through a capacitance. Attenuation of traveling waves.
Unit-5 (i) Over Voltage Protection: Basic construction and operation of ground wires- protection angle and protective zone, ground rods, counterpoise, surge absorber, rod gap and arcing horn, lighting arresters - expulsion type, non -linear gap type and metal oxide gapless type.
(ii) Insulation Coordination: Volt - time curves, basic impulse insulation levels, coordination
of insulation levels.

Reference/Suggested Books
1. Naidu:High Voltage Engineering 4/e, TMH
2. Kauffel-High Voltage engineering, ELSEVIER
3. Wadhwa: High Voltage Engg., Wiley Eastern Ltd
4. Kuffe E. & Abdulla M., High Voltage Engineering, Pergman Press
5. Alston L.L., H. V. Technology, Oxford, University Press
6. Thapar B., Power System Transients and High Voltage Principles , Capital Pub.
7. Subir Ray,’ An Introduction to High Voltage Engineering’ Prentice Hall of India