This book reflects fundamentals to the power system and equips them to recognize and solve the transient problems in power networks and its components. Practicality has been a paramount concern in its preparation. Many pioneers of electrical engineering explored the transient behaviors of the electric circuits. This book effectively helpful for the graduate, post graduate studies and researches on power system transients and emergence & re emergence the problems in the power system operations and control for new applications with new equipment. I have attempted to set out the fundamental ideas at the beginning of the book and made consistent effort to show thereafter how one peels away the superficial differences in practical transient studies by referring various books, researches, and physical industrial visits.