Course Details

Subject {L-T-P / C} : EE6204 : Transients in Power System {3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Pravat Kumar Ray


Transients in a transmission line: Travelling waves in transmission line, wave equations for voltage and current, characteristic impedance of transmission line from wave equations, special cases of transmission line, input impedance, standing wave ratio, reflection co-efficient and input power of transmission line, Transmission line as circuit elements. Fault Analysis: Short circuit on a Synchronous machine on no load, Short circuit on a loaded Synchronous machine, Short circuit current computation through Thevenin’s Theorem, Ratings of Circuit Breaker, Methods of locating limiting reactor, Short circuit analysis of large system, Z-bus building algorithm, Symmetrical components, Unsymmetrical fault analysis using Symmetrical components, open conductor fault analysis. Circuit Breaking Transients: Restriking voltage, Rate of Rise of Restriking Voltage, Effect of power factor of circuit on Restriking voltage, Current chopping, capacitive current breaking, Resistance Switching. Lightning Transient: Mechanism of Lightning dishcharge, Types of Lightning strokes, Protection against Lightning surges. Transients in Grounding System: Resonant grounding, Methods of neutral grounding, Harmonic Supressor. Surge response of transformers, Overvoltage protection.Insulation co-ordination, Generation and measurement of impulse voltages and currents. Impulse testing of equipments

Course Objectives

  1. Develop a basic idea regarding transients in transmission lines and in electrical machines
  2. Develop a basic understanding of the transient effect of lightning, faults, and switching on power systems.
  3. Provide a basic understanding of the principles used to protect power system equipment from transients.

Course Outcomes

1. Transients in transmission line
2. Transients during fault conditions in power system
3. Switching surge studies across circuit breaker terminals
4. Mechanism of lightning surge generation

Essential Reading

  1. Allan Greenwood, Electrical Transients in Power System, John Wiley & Sons , 2001
  2. L. V. D. Sluis, Transients in Power Systems, John Wiley , 2001

Supplementary Reading

  1. C. S. Indulkar and D. P. Kothari, Power System Transients – A Statistical Approach, Prentice Hall of India , 2003
  2. P. Chowdhuri, Electromagnetic Transients in Power Systems, Research Studies Press , 2014