Chapter 4 divided into four chapters i.e. Chapter 4: Symmetrical Fault Analysis, Chapter 5: Symmetrical Components, Chapter 6: Unsymmetrical Fault Analysis and Chapter 7: Power System Grounding ? Keeping in view the tremendous technological advancement in power system protection, three new chapters have been included namely Chapter 11: Travel?ling Wave Based Protection, Chapter 22: WAMS Based Protection of Power Network and Chapter 23: Protection of Transmission and Distribution Systems in Presence of Renewables ? Definitions of latest new terms given in Chapter 1. ? Coordination of overcurrent relays in interconnected power system included in Chapter 8, protection of motors in Chapter 13; miniature circuit breakers, moulded case circuit breakers and residual current circuit breakers in Chapter 18 and protection of series compensated transmission line in Chapter 21 ? Every chapter has been provided with Multiple Choice Questions