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Power transformers routinely operate under non-ideal conditions including harmonics, inrush currents, and transient disturbances. Accurate electromagnetic simulation is essential for assessing performance, identifying saturation risks, and validating electrical behaviour before prototyping. This Whitepaper presents a step-by-step finite-element methodology covering geometry preparation, material assignment, coil and winding definition, solver configuration, and result interpretation in both frequency and time domains. Simulation results demonstrate accurate magnetic field distributions, validated turns and current ratios, and stable transient waveforms — illustrating FEM as a practical approach for transformer engineering analysis and design verification.