Study of transmission line magnetic fields

Abstract

The authors present a review of magnetic field calculations associated with power frequency 3, 6, and 12-phase transmission lines. A computer program implemented using an IBM PC-XT is described briefly. The interactive program allows the user to calculate the two-dimensional electric and magnetic field parameters at any point near transmission lines. Plotting and mapping features are also available. To facilitate calculations, it is assumed that the transmission line conductors are straight, infinitely long, and parallel to each other and to the ground plane. Variations due to sag and tower effects are ignored. Given these assumptions, the calculation is a two-dimensional analysis, with lateral and vertical variations. Case studies related to magnetic fields are included.<>