The electric power system is a highly complex and dynamic entity. One malfunction or a carelessly set relay can jeopardize the entire grid. Power system protection as a subject offers all the elements of intrigue, drama, and suspense while handling fault conditions in real life. The book reflects many years of experience of the authors in teaching this subject matter to undergraduate electrical engineering students. The book, now in its second edition, continues to provide the most relevant concepts and techniques in power system protection. The second edition offers a new chapter on circuit breakers to further strengthen the text and meet the curriculum needs of several universities. Both, students and teachers, will find the book stimulating as it contains around 300 well-annotated figures and numerous tables. It also includes 20 quiz sets consisting of about 200 multiple- choice questions to test the students’ understanding of the concepts discussed. Written in a simple, clear and down-to-earth style, this state-of-the-art text covers the entire spectrum of protective relays—from electromechanical to numerical—for protection of transmission lines, transformers, busbars, generators, and motors. The presentation is stimulating, analytical but at the same time concise. The students will find the material very friendly and refreshingly simple. The book has a wealth of useful figures, graphs, and block diagrams to help the students assimilate the concepts discussed and develop practical orientation.