Electromagnetic forces densities for 3 phase busbar parallel connected to rectifier load

Abstract

This paper introduces an analytical approach to compute local force density in every busbar section and the overall forces per unit length for every busbar. An assessment of the overall forces on various busbar structures is made considering all the factors affecting these forces. These factors are the busbars dimension, the instantaneous current values that determine the busbar carrying the maximum current value, inter-busbar spacing, the vicinity of metal conducting plate and the busbar arrangements, either the cross sectional area, in which the current density flow perpendicular to the surface, is horizontal or vertical arrangement but in all cases it is laid horizontally. The local force density and overall force computation is made in case of steady state current neglecting harmonics, steady state current considering harmonics and in case of short circuit current. An experimental model of nonlinear load is implemented to investigate the local force density in the presence of harmonic currents over one cycle.