Modelling of power transformer winding faults for interpretation of frequency response analysis (FRA) measurements

This paper discusses the possibility of utilizing power transformer modelling for interpretation of frequency response analysis (FRA) measurements. FRA is a reliable technique for power transformer winding distortion and deformation assessment and monitoring. A lumped parameter model of a three phase power transformer is briefly presented and applied to simulate frequency responses at various winding fault conditions such as short-circuited turns, axial displacements and radial deformations. Simulations and discussions are presented to explore the potentials of the model to transformer fault detection based on FRA measurements.