Proximity Effect in a Shielded Symmetrical Three Phase Line

Abstract

In this paper we present an approximate analysis of the proximity effect in a shielded symmetrical three-phase line with conductors of circular cross section. The system of two integral equations for current densities is solved approximately by assuming them in the form of two finite series with properly chosen basic functions. The unknown coefficients in these series are found by applying the point matching procedure. Numerical results are given for the AC to DC resistance ratio of the line conductors and for the power loss in the shield.