Winding deformation analysis in power transformers using Finite Element Method

Abstract

Winding deformation in power transformers affects its mechanical integrity. Diagnosis of winding deformation is a necessary step towards preventing its permanent failure. Sweep Frequency Response Analysis (SFRA) is widely used to analyze the nature and extent of deformation. However, the location of deformation needs the signature from the deformed transformer at various locations, which is practically not feasible. In this paper, Finite Element Method (FEM) and SFRA are used to model deformations on a benchmark winding and obtain corresponding signatures. Different parameters derived from SFRA are used as indices to distinguish type and location of deformations.