ABSTRACT
Wires and cables are also influenced by circulating currents and therefore represent an important class of problems for designing to minimize losses. This chapter considers the simplest wire configuration, a straight isolated cylinder carrying alternating current. It shows a direct calculation of the resistance of “Litz” wire. The Chapter discusses the shielding properties of a conducting cylinder in a transverse magnetic field, and the resistance of a current carrying cylinder in a magnetic field. In addition, various calculations treating stranded transposed conductors are closely related to cable design. The present analysis provides a design approach for reducing total cable losses by employing two or more coaxial conductors of optimum dimensions. The analytical results are presented in general form and then applied in a specific design example using appropriate approximations. It is found that a cable with increased current capacity can be designed using a coaxial conductor of appropriate dimension and a suitable method of compensation.
