Magnetic Field Calculation of Distribution Transformer with Finite Element Method

Transformer noise is closely relative with the magnetic field distribution in the core. In this paper, the nonlinear B-H curve of a new-type silicon steel sheet is measured. The finite element model of the distribution transformer is built to analyze the magnetic field distribution in the core. The winding current is used as the excitation source. Magnetic flux density comparison between two types of silicon steel sheets is conducted. The result shows that the core assembled with the new kind silicon steel sheet B18R065 has lower maximum magnetic flux density, which is much proper for low-noise transformer design. The proposed model is useful for further vibration and acoustic analysis of distribution transformer.