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Transformers are one of the main devices in the utility grids. Reliability, power quality, economic cost and even the company image are influenced by the transformers health. For this reason, advanced techniques have been developed in order to improve the transformer life assessment. FRA (frequency response analysis) techniques are nowadays widely used by the electric utilities as one of these advanced techniques. They are specially appreciated to detect winding displacements inside the transformer. The main problem about FRA techniques is to interpret the observed evolution of the frequency response in order to identify both failures and failures tendencies in the transformer. In order to solve this problem a modeling tool is proposed in this work using the frequency response measured at the transformer.