Textbook in PDF format The book contains all essential fundamentals of high- and extra high voltage overhead lines and underground cables. Its main contents are as follows: • Fundamentals and history of high-voltage AC and DC transmission • Design and structure of power supply networks • Introduction to network planning and operation • Design of overhead lines and underground cable routes • Approval procedures and environmental impact assessment for projects • Characteristics of overhead lines and cables, grid calculation basics, various examples • Overhead line components including tower foundations and conductor stringing • Uprating and upgrading of overhead lines • Cables for high-voltage direct current transmission (HVDC) • Cable laying methods, partial undergrounding and monitoring • Comparison of the technical properties of cables and overhead lines • Comparison of the total costs of cables and overhead lines • Future developments in power transmission • Application of Artificial Intelligence in grid operation and -maintenance