Transformer Leakage Inductance Estimation with Windings Radial Displacement

This paper presents an analytical model of threephase transformers that allows for the estimation of the winding leakage reactance. Unlike other models, this one can be applied to windings that have experienced partial or total deformations in their geometry. Such deformations are common in transformers when they are subjected to significant dynamic stresses, for example, due to external faults. The model is validated through experimental testing on a laboratory transformer and is used to estimate changes in the leakage reactance of a power transformer under specific deformations.