ELECTROMAGNETIC VIBRATION ANALYSIS OF POWER TRANSFORMER WINDINGS: VERIFICATION OF STRUCTURAL MODELS BASED ON ANALYTICAL MODELING
DOI:
https://doi.org/10.62985/j.huit_ojs.vol26.no2E.397Keywords:
Power transformer, electromagnetic vibration, multiphysics simulation, analytical verificationAbstract
Excessive vibration in power transformers is a critical issue that compromises mechanical integrity, may result in insulation failure, and generates significant acoustic noise. Consequently, establishing a reliable method to quantify and predict these vibrations during the design phase is essential. This paper proposes a rigorous multiphysics simulation framework to analyze the vibration characteristics of a 40 MVA transformer winding. To validate the accuracy of the numerical approach, the study employs a systematic verification process based on analytical modeling. Initially, a fundamental beam model is utilized as a benchmark. The natural frequencies calculated via analytical solutions are compared with simulation results to confirm the correctness of mesh settings and boundary conditions. This agreement supports the assumption that the winding material behaves within the linear elastic region under harmonic excitations. Subsequently, the electromagnetic force distribution acting on the winding is computed using Finite Element Analysis. These forces are then applied to the verified structural model to determine the winding's natural frequencies and forced vibration response. The results demonstrate that verifying numerical models against analytical theory provides a robust foundation for assessing transformer vibration risks.
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