Finite element method to construct a lumped parameter ladder network of the transformer winding

Power transformers are one of the critical points in the renewable energies networks for the transport and distribution of the electric energy. As a result, the diagnosis of transformers is necessary to ensure the reliability and service life. The frequency behavior of the transformer winding is generally studied using a high-frequency model to diagnose the various damages of the winding. For this purpose, this paper discusses the application of the finite element method (FEM) to construct a lumped parameters ladder network of an actual transformer winding. The investigated coil is discretized in five (05) identical sections that includes 30 turns for each. In addition, after the experimental validation of the adopted model, a diagnostic study to the axial deformations of the transformer winding was made using the parameters analysis of the detailed model and the transfer function obtained from the FRA test.