Increasing the Accuracy of Determining the Resistance of Three-Phase Busbar's Trolleys

Abstract

Shop floor power supply systems must meet stringent requirements for high reliability and efficiency. Trolley's busbars are an important element of the power supply system. Currently, engineering methods are known that allow to determine the resistance of trolleys. But they have a high error, since they do not take into account the surface effect, skin effect, proximity effects, edge effects, as well as the higher harmonics of the current in the network. In this paper, an approach is proposed that allows to determine the resistance in the trolley's busbars with high accuracy. This method is based on the application of the decomposition of electromagnetic processes in a trolley's busbars. The method implements the inclusion of one of the phases of the busbar to determine the resistance without the influence of an external magnetic field. As well as two phases of the busbar to determine the active resistance in the presence of an external magnetic field caused by the action of a third-party current of the neighboring trolley's busbars. The paper presents dependences for determining the values of resistance for the corresponding phases and harmonics of the current without spending time on field modeling. And also, regardless of the location of the trolleys, their number, shape, as well as the non-symmetry of the phase currents.