Vibration model of power transformer under short-circuit condition

Condition monitoring and fault diagnosis of power transformer using vibration analysis method has attracted great attention. This paper presents a transformer vibration model under short-circuit condition, which consists of two sub-models. One is a vibration model of internal windings, and the other is a signal transmission model. In the laboratory tests, the parameters in the model is measured using data set sampled in single phase short-circuit tests. Then with this model, the estimated vibration signals of the same point can be calculated by employing the input current only. In order to validate the whole model, three phase short-circuit tests are taken, and the results show a good agreement between estimated signals and measured signals.