JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power Systems – I, Electromagnetic Field theory

Course Objectives:

• To deal with the detailed analysis of Breakdown occurring in gaseous, liquids and solid dielectrics
• To inform about generation and measurement of High voltage and current
• To introduce High voltage testing methods

Course Outcomes

After completion of this course, the student will be able to

• Acquire knowledge on, basics of high voltage engineering
• understand break-down phenomenon in different types of dielectrics
• understand generation and measurement of high voltages and currents
• understand the phenomenon of over-voltages, concept of insulation co-ordination
• know testing of various materials and electrical apparatus used in high voltage engineering

UNIT - I

Introduction To High Voltage Technology And Applications: Electric Field Stresses, Gas / Vacuum as Insulator, Liquid Dielectrics, Solids and Composites, Estimation and Control of Electric Stress, Numerical methods for electric field computation, Surge voltages, their distribution and control, Applications of insulating materials in transformers, rotating machines, circuit breakers, cable power capacitors and bushings.

UNIT - II

Break Down In Gaseous And Liquid Dielectrics: Gases as insulating media, collision process, Ionization process, Townsend’s criteria of breakdown in gases, Paschen’s law - Liquid as insulator, pure and commercial liquids - breakdown in pure and commercial liquids. Break Down In Solid Dielectrics: Intrinsic breakdown, electromechanical breakdown, thermal breakdown, breakdown of solid dielectrics in practice, Breakdown in composite dielectrics, solid dielectrics used in practice.

UNIT - III

Generation of High Voltages And Currents: Generation of High Direct Current Voltages, Generation of High alternating voltages, Generation of Impulse Voltages, Generation of Impulse currents, Tripping and control of impulse generators. Measurement Of High Voltages And Currents: Measurement of High Direct Current voltages, Measurement of High Voltages alternating and impulse, Measurement of High

R16 B.TECH EEE.

Currents-direct, alternating and Impulse, Oscilloscope for impulse voltage and current measurements.

UNIT - IV

Non-Destructive Testing of Material and Electrical Apparatus: Measurement of D.C Resistivity, Measurement of Dielectric Constant and loss factor, Partial discharge measurements. High Voltage Testing of Electrical Apparatus: Testing of Insulators and bushings, Testing of Isolators and circuit breakers, testing of cables, Testing of Transformers, Testing of Surge Arresters, and Radio Interference measurements.

UNIT - V

Over Voltage Phenomenon and Insulation Co-Ordination: Natural causes for over voltages – Lightning phenomenon, Overvoltage due to switching surges, system faults and other abnormal conditions, Principles of Insulation Coordination on High voltage and Extra High Voltage power systems.

TEXT BOOKS:

• 1. M. S. Naidu and V. Kamaraju, High Voltage Engineering by– TMH Publications, 4th Edition 2009.
• 2. E. Kuffel, W. S. Zaengl, J. Kuffel, High Voltage Engineering: Fundamentals by Elsevier, 2nd Edition 2000.

REFERENCE BOOKS:

• 1. C. L. Wadhwa, High Voltage Engineering by, New Age Internationals (P) Limited, 1997.
• 2. Ravindra Arora, Wolfgang Mosch, High Voltage Insulation Engineering by, New Age International (P) Limited, 1995.
• 3. “Mazen Abdel Salam, Hussein Anis, Ahdan El-Morshedy and Roshdy Radwan”, High Voltage Engineering, Theory and Practice, CRC Press, 2nd Edition 2000. R16 B.TECH EEE.