Study on the electromagnetic force affected by short-circuit current in vertical and horizontal arrangement of busbar system

Each busbar conductor of a phase is subjected to a force due to the short-circuit currents. In this paper, the electromagnetic forces affected by the short-circuit current in three-phase busbar conductor are calculated in vertical and horizontal arrangement. The short-circuit current densities are calculated mathematically. The calculations are performed by assuming a peak value of steady-state ac current is equal to the peak value of the short-circuit current. The electromagnetic forces due to the short-circuit current are calculated according to the equation introduced by IEC Standards 865/1993. The electromagnetic force generated in vertical arrangement is compared with the horizontal of busbar. The result depicted that the busbar in vertical arrangement has about 2 times higher electromagnetic force compared with that in horizontal arrangement. The arrangement of the busbar obviously influences the strength of electromagnetic force due to short-circuit current. Furthermore, the electromagnetic force obtained from the simulation by finite element method in vertical arrangement was agree with the calculation obtained using IEC Standard 865/1993.