Transformer Controlled Switching to Eliminate Inrush Current - Part I: Theory and Laboratory Validation

The technology of power transformer modeling is studied in this paper and a switching strategy is proposed for controlling the phenomena associated with transformer inrush currents. A comprehensive time-domain program is developed to deal with these transients and a solution for obtaining the required residual fluxes is considered. The approach is computationally implemented and both the theoretical and the experimental investigations are carried out to highlight the method of application and its validation. The results emphasize the possibility of building devices that eliminate the well-known transformer inrush currents and their side effects