Course Title: 
Power System Protection and Switch Gear
Course Code: 
Year Taught: 
Undergraduate (UG)
School of Engineering

'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

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

  • 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.