Impedance of Nonmagnetic Overhead Power Transmission Conductors

A high-accuracy method of calculating skin-effect resistance and reactance of nonmagnetic stranded overhead power transmission conductors is described. This method uses an equivalent network approach and takes into account the effects due to wire spiraling, as well as the proximity effect between strands and the nonuniform current distribution in each strand. It produces results of greater accuracy than manufacturing tolerances usually warrant for overhead transmission conductors and requires a very small investment in computation cost. A table of skin-effect resistance factors that covers a wide range of standard aluminum conductors has been computed.