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Transformer Impulse Surges Calculation by FEM Coupled to Circuit

This paper presents a new technique for the transient analysis of power transformers under standard impulse excitations. Based on a 2-D finite element method magnetic and electric field simulation coupled to an electric circuit, the technique allows for an analysis of a wide range of winding and insulation designs of a transformer. Also, a 2-D approximation and a direct electric and magnetic field computation (without an equivalent circuit modeling) make this technique effective for engineering applications. Results of calculations of a three-phase power transformer 125MVA-220/10 kV are presented to validate the accuracy of the approach.