Verification Modeling of Magnetic Field Influence on Power Transmission Line Losses

The article is devoted to the problem of a magnetic field influence in overhead power transmission line load-bearing structure and methods of its research. The research purpose is to develop a methodology for determining the induction current effect on power transmission line loss. In theory, three-phase three-wire AC power transmission line produces the magnetic field that affects the symmetry of the voltage. To find the flux linkage with research object, a calculation was performed using the Poisson equation for vector magnetic potential. The symmetrical components method is used to calculate power losses in the asymmetric mode, considering losses in the ground. To verify the study results, physical and computer modeling of a real object was performed. For results confirmation, it was decided to find out a mutual inductance coefficient. The oscilloscope obtained by a small-scale physical model has a convergence with ratio error equal 1.4 %. The results of modeling are compared in discussion. The research can be useful in the design and modernization of overhead power transmission lines.