Numerical calculation of magnetic dissipation at power transformers
The analysis of the power transformer electromagnetic dissipation has been based on the analysis of electromagnetic process distribution in the stationary regime. The finite element method was used in the area of the numerical calculation of magnetic field. The 2D calculation of magnetic field distribution in transformers was realized through the application of the FEM2D software. From the numerical calculation of the magnetic field, the dissipating inductivity is calculated through the application of the energy method and the linked fluxes method. Based on the laboratory measures conducted on the model of a low-voltage transformer, the values of the numerical calculation have been provided. Results of the numerical calculation of the dissipating inductivities were compared to the measured values obtained in the short circuit regime with the application of very precise instrumentation. Some proportional deviations were noted. Conducted analysis on the numerical calculation of magnetic dissipation from the point of data accuracy, and complexity of the calculation brings the energy method into first place. The acceptable results have also been exercised with the linked fluxes method.