In recent years, numerous books on network theory (particularly on network synthesis) have been published in the field of electrical communication technology. However, to my knowledge, no modern representation of the current state of network theory in power transmission technology has yet been undertaken. This book aims to address this gap. With the emergence and ongoing improvement of network models, as well as the advent of electronic computing machines, the theory of interconnected networks has been significantly challenged. Although much in this field is still evolving, especially in applications, the USA has been a leader in this area for years. Almost every issue of the Transactions A. I. E. E. Part III (now I. E. E. E.), Power Apparatus and Systems, contains several papers, but in recent years...