High Voltage Overhead Transmission Line Electromagnetics: Volume II

There are two purposes for this manuscript. The first is to examine the electromagnetic theory behind many of the calculations relevant to the design of high voltage power lines. These include electromagnetic propagation on wires above the earth, corona onset calculations, electrostatic fields near insulators and electromagnetic induction effects between high voltage transmission lines and other systems that share the right of way. This portion of the book can be used as the basis for further research in these areas. Sections of the book that require more advanced theory are indicated and can be skipped by the reader who is not interested in research. Following these sections (if necessary) are short introductions that provide a summary of the ideas introduced in the more advanced section. The second purpose is to show how the more general theory reduces to the theory commonly used by practicing engineers. Mastering this material will result in a better understanding of the limitations of the simplified theory of transmission lines that is often presented in power systems courses. As an adjunct to this, some practical aspects of designing high voltage transmission lines will be discussed. These include discussions of transmission line ampacity and sag calculations, a general approach to the selection of insulators and the physics behind switching surges and their consequences.