This classroom-tested, graduate-level text presents the basic tools required to understand the components in an electric power transmission system. It explains from first principles the expressions that predict the performance of transmission systems and transformers. The authors then extend these concepts to balanced three-phase systems and unbalanced systems. They introduce symmetrical component analysis of transmission systems, three-phase transformers, and faulted systems. They also describe the design of untransposed transmission lines and discuss other analysis component systems. A solutions manual is available for qualifying instructors.