Analysis of electromagnetic on transformer due to inrush power system by Ansys Maxwell

Abstract

A current in the winding and a flux in the magnetic circuit increase very high when a transformer is connected to the grid. This is the cause of the magnetic circuit saturation. The time of magnetic circuit saturation can occur up to some the frequency of alternating electric current. At the same time, the primary current waveform contains a harmonic component and may cause malfunction of relay devices or impair operation of other surrounding electrical equipment. The paper has built a simulation model using Ansys Maxwell 3D to calculate the transformer inrush current with a power of 250kVA to the grid in the case of load and no load. The results of the current, voltage and inductance values ​​of the machine which are analyzed one after another help engineers to design, manufacture and operate, choose the appropriate plan in case the transformer is connected to the grid.