Book excerpt: Electromagnetic transients in power systems are generated by lightning and switching surges and can result in frequent and costly failures of electrical systems. This book explains modern theories of the generation, propagation and interaction of electrical transients with electrical systems. It also covers practices for the protection of electrical systems against transients.Presents the basic mathematical and physical principles of electromagnetic transients. -- Addresses topics that are of prime importance to the electric power industry today, including lightning-induced voltages on overhead lines, protection of substations, and the effects of transient on low-voltage systems. -- Includes problems to facilitate understanding of the various topics.