Prevention is better than cure and proper cure needed if a problem arises. Maintenance is the key for both preventions and cures. This book devoted to the electrical substation design and analysis and subjected to represent the maintenance of all types of electrical equipments. In this book the maintenance schedule for the associated equipments to the substation installation, commissioning and testing are highlighted with brief explanation. This book covers all vital equipments serving the substation for power demands by both domestic and industrial applications. In this book, making or preparing maintenance schedule of dc machines, induction machines, synchronous machines, transformer, transmission line, distribution lines, underground cables, circuit breakers, switchgear, protective relays, sf-6 circuit breakers, batteries in substation are presented with considering the electricity rules and regulations provide by the government. This book will be very helpful for the students of under graduated and post graduate studies in technical and skill development institutions. Various technical books, technical firms, research papers, technical manuals, notes of various educational firms and books associated to the title considered to enhance the quality of the literature for better understandings. Electrical equipment must be serviced and tested on a regular basis in order to get the most out of it, maintain its dependability, and reduce maintenance costs. Electrical equipment maintenance and overall safety are receiving more and more attention. Many communities are enacting regulations and codes requiring periodic inspection and testing of large electrical facilities within their jurisdictions; the federal government has passed laws requiring substation maintenance; and insurance companies are basing premiums on the quality of a facility's maintenance program and equipment condition. I wish to acknowledge the considerable contributions that many of my colleagues, researchers, refereed books, text manuals and internet sources made indirectly to this book through countless studies and discussions for the successful presentation of the book on maintenance schedule of electrical substation equipments.