89. Measuring Frequency Responses of Transformer Windings Powergrid Experience

High short circuit currents can lead to deformations and displacements of the transformer widings due to mechanical forces. The paper discusses SFRA modern diagnostic method which identifies such predamaged power transformers which has better sensitivity towards changes in the winding geometry. Changes in the geometric configuration alter the impedance network, and in turn alter the transfer function. This enables a wide range of failure modes to be identified.