The Surge Voltage Test in High Power Transformers by the Finite Element Method

The present paper tries to emphasize the importance of surge voltage tests in High Power Transformers and the main advantages of developing them by a Finite Element Method (FEM). The sequence of steps to define the model, the geometry and the conditions that characterize the real transformer are presented. The electric parameters that describe the problem are calculated via an electric circuit model generated by the finite element program, and are used in a transient simulation to obtain the electric field value along the windings at different time steps. The critical points can be easily obtained, which allow us to determine the probability of an insulation failure in case of an electric discharge occurs. In addition, this technique also represents graphically the wave displacement for each time step.

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