Analysis of electromagnetic stresses and structural integrity on the winding of a transformer under inrush currents conditions

The objective of this paper is to assist in the investigation of electromagnetic forces during faults inside the transformers as a result of transient states. The methodology is based on modeling a single-phase 50 MVA transformer subjected to inrush currents through finite element method (FEM). In this perspective, the conditions of inrush currents are used to estimate the magnetic field density dispersion in the transformer and to find the values of forces in axial and radial directions. These components are distributed along the energized windings for observing the loads in high-voltage windings. Thus, this article will present investigations of electromagnetic forces, structural deformation, stresses, and safety factor on the winding of transformers when subjected to inrush current.