JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives:

• To provide strong knowledge on different types electrical stresses on power system and equipment.
• To impart knowledge on generation of high AC, DC and impulse voltages and impulse currents.
• To know about generation and measurement of high voltages and high currents.

Course Outcomes

After completion of this course, student will be able to

• To design the suitable high voltage and high current generating and measuring circuits.
• To understand generation and measurement of impulse and peak voltages.

UNIT - I

Electrostatic Fields and Field Stress Control: Electric fields in homogeneous Isotropic materials and in multi dielectric media – Simple configurations – field stress control. Methods of computing electrostatic fields – conductive analogues - Impedance networks, Numerical techniques – finite difference method – finite element method and charge simulation method.

UNIT - II

Generation of High Voltages and Currents: Direct Voltages: AC to DC conversion methods, electrostatic generators – Cascaded Voltage Multipliers, Alternating Voltages: Testing transformers – Resonant circuits and their applications. Impulse Voltages: Impulse voltage specifications – Impulse generation circuits – Operation, construction and design of Impulse generators, generation of switching and long duration impulses. Impulse Currents: Generation of high impulse currents and high current pulses.

UNIT - III

Measurement of High Voltages: Measurement of high DC Voltages: Series resistance meters, voltage dividers and generating voltmeters. Measurement of high AC Voltages: Series impedance meters, electrostatic voltmeters, potential transformers and CVTS – voltage dividers and their applications.

UNIT - IV

Measurement of Peak Voltage: Sphere gaps, uniform field gaps, rod gaps. Chubbs – Fortesuere methods. Passive and active rectifier circuits for voltage dividers.

UNIT - V

Measurement of Impulse Voltages & Currents: Measurement of Impulse Voltage: Voltage dividers and impulse measuring systems – generalized voltage measuring circuits – transfer characteristics of measuring circuits – L.V. Arms for voltage dividers – compensated dividers. Measurement of Impulse Currents: Resistive shunts – current transformers – Hall Generators and Faraday generators and their applications – Impulse Oscilloscopes.

TEXT BOOKS:

• 1. High Voltage Engineering E Kuffel and W.S. Zaengl. Pergamon press, Canada Ltd., 1984.
• 2. High Voltage Engineering M.S. Naidu and V. Kamaraju, Tata McGraw Hill Book Co., New Delhi, 3rd edition 2004.
• 3. High Voltage Technology – LL Alston, Oxford University press, 1968

REFERENCES:

• 1. High voltage Measuring Techniques – A Schwab, MIT press Cambridge, USA 1972.
• 2. High Voltage Engineering – Sabeer Ray