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Course Detail

Course Name Power System Protection and Switch Gear
Course Code 15EEE355
Program B. Tech. in Electrical and Electronics Engineering
Credits Campus: Bengaluru, Coimbatore, Amritapuri
Year Taught 2015
Year Taught 2016
Year Taught 2017
Year Taught 2018


Unit 1

Nature, causes and consequences of faults – Fault statistics – Need for protection – Essential qualities of protection – Types of protection – Primary and back up protection – Instrument Transformers – Basics of switchgear – Fuses, isolators, Earthing switches.

Development of protective relays – Recent developments – Operating principle – Classification of relays based on construction – Electromagnetic relays, Thermal relays, Overview of Static and Microprocessor relays, Numerical Relays – Introduction, Block diagram, Sampling theorem, Anti–Aliasing Filter, Least square method for estimation of phasor, concept of Discrete Fourier Transform to estimate the phasor.

Unit 2

Apparatus protection – Bus Bar protection, Transmission Line protection – realization of distance relays using numerical relaying algorithm, Introduction to wide area measurement (WAM) system – Generator protection – Motor Protection – Transformer Protection.

Overvoltage protection – Lightning arresters – Operating principle and types of arresters, Surge absorbers – Insulation co-ordination.

Unit 3

Circuit breakers – Operating principle – Arc phenomenon, principle, DC and AC Circuit Breaking – Problems of circuit interruption – Interruption of capacitive currents, Current chopping, Resistance Switching and methods of arc extinction – Arc interruption theories – Arc voltage, restriking voltage, Recovery voltage.

Types of circuit breaker – Construction and Operating Principle – HVDC circuit breaker – Selection of circuit breaker and its ratings – Auto reclosing.

Text Books

  • Ravindra P. Singh, “Switchgear and power system protection”, Prentice Hall of India, 2009
  • Badri Ram & D N Vishwakarma, “Power system protection and switch gear”, Tata McGraw Hill Education, 2001.
  • T. S. Madhava Rao, “Power system protection: Static Relays”, Tata McGraw Hill Education, 1989.


  • A. S. Ingole, ”Switchgear and protection” Umesh publication, 2006
  • B. Ravindranath and M. Chander, ”Power system protection and switchgear”, New age International (P) Ltd., 2003
  • C. Christopoulos and A. Wright, ”Electrical power system protection”, Springer International edition, 2010.
  • Hadley, et al. Securing Wide Area Measurement Systems, Pacific Northwest National Laboratory. June 2007.

‘Power System Protection and Switch Gear’ is a course offered in B. Tech. in Electrical and Electronics Engineering program at School of Engineering, Amrita Vishwa Vidyapeetham.

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