High quality electrical service is everyday more stringent in utilities and industrial facilities around the world. One of the main players to achieve this is the protection system, which has to be reliable, fast and with a good cost/benefit ratio. Protection of generation and transmission systems are also treated in the text. References to modern topics such as the Distributed Generation, Smart Grid and Standard IEC 61850 have been introduced. Written by two well experienced engineers who combine a comprehensive theoretical background with examples and exercises, this book will allow the reader to easily follow the ideas explored. The book will be valuable to pre and postgraduate students, design, maintenance and consulting engineers as well as instructors looking for proper references. Preface and acknowledgements Preface to second edition Preface to third edition 1 Introduction 2 Calculation of short-circuit currents 3 Classification and function of relays 4 Current and voltage transformers 5 Overcurrent protection 6 Fuses, reclosers and sectionalisers 7 Directional overcurrent relays 8 Differential protection 9 Distance protection 10 Protection of industrial systems 11 Industrial plant load shedding 12 Protection schemes and substation design diagrams 13 Communication networks for power systems automation 14 Installation, testing and maintenance of protection systems Appendix: Solutions to exercises Bibliography