JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power System –I and Electro Magnetic Fields

Course Objectives:

• To analyze the performance of transmission lines.
• To understand the voltage control and compensation methods.
• To understand the per unit representation of power systems.
• To examine the performance of travelling waves.
• To know the methods of overvoltage protection and Insulation coordination of transmission lines
• To know the symmetrical components and fault calculation analysis

Course Outcomes:

• Analyze transmission line performance.
• Apply load compensation techniques to control reactive power
• Understand the application of per unit quantities.
• Design over voltage protection and insulation coordination
• Determine the fault currents for symmetrical and unbalanced faults

UNIT - I

Performance of Lines Representation of lines, short transmission lines, medium length lines, nominal T and PI- representations, long transmission lines. The equivalent circuit representation of a long Line, A, B, C, D constants, Ferranti Effect, Power flow through a transmission line, receiving end power circle diagram.

UNIT - II

Voltage Control Introduction – methods of voltage control, shunt and series capacitors / Inductors, tap changing transformers, synchronous phase modifiers. Compensation In Power Systems Introduction - Concepts of Load compensation – Load ability characteristics of overhead lines – Uncompensated transmission line – Symmetrical line – Radial line with asynchronous load – Compensation of lines.

UNIT - III

Per Unit Representation of Power Systems The one-line diagram, impedance and reactance diagrams, per unit quantities, changing the base of per unit quantities, advantages of per unit system. Travelling Waves on Transmission Lines Production of travelling waves, open circuited line, short circuited line, line terminated through a resistance, line connected to a cable, reflection and refraction at T-junction line terminated through a capacitance, capacitor connection at a T-junction, Attenuation of travelling waves.

UNIT - IV

Overvoltage Protection and Insulation Coordination Over voltage due to arcing ground and Peterson coil, lightning, horn gaps, surge diverters, rod gaps, expulsion type lightning arrester, valve type lightning arrester, ground wires, ground rods, counter poise, surge absorbers, insulation coordination, volt-time curves.

R18 B.TECH EEE III YEAR

UNIT - V

SYMMETRICAL COMPONENTS AND FAULT CALCULATIONS Significance of positive, negative and zero sequence components, Average 3-phase power in terms of symmetrical components, sequence impedances and sequence networks, fault calculations, sequence network equations, single line to ground fault, line to line fault, double line to ground fault, three phase fault, faults on power systems, faults with fault impedance, reactors and their location, short circuit capacity of a bus.

TEXT BOOKS:

• 1. John J. Grainger & W.D. Stevenson: Power System Analysis – Mc Graw Hill International 1994.
• 2. C.L. Wadhwa: Electrical Power Systems – New Age International Pub. Co. Third Edition, 2001.

REFERENCES:

• 1. Hadi Scadat: Power System Analysis – Tata Mc Graw Hill Pub. Co. 2002
• 2. W.D. Stevenson: Elements of Power system Analysis – McGraw Hill International Student Edition.
• 3. D.P. Kothari and I. J. Nagrath, Modern Power System Analysis - Tata Mc Graw Hill Pub. Co., New Delhi, Fourth edition, 2011 R18 B.TECH EEE III YEAR