The book covers all topics that are considered essential for understanding the operation and design of EHV, AC overhead lines and underground cables. Theoretical analysis of all problems combined with practical application are presented in detail. EHV laboratory equipment and testing are fully covered together with application of digital recorders, fibre optics, etc. for impulse measurements. Every chapter contains many worked examples in order to illustrate and reinforce the theory. All examples are taken from practical situations as far as possible.