Stability Analysis of Transformer Mechanism Model Based on Finite Element Analysis Under Load Fluctuations
DOI:
https://doi.org/10.13052/dgaej2156-3306.4138Keywords:
Finite element analysis, transformer stability, load fluctuation, electromechanical coupling, vibration responseAbstract
This study investigates the mechanical stability of power transformers subjected to fluctuating load currents, which induce dynamic electromagnetic forces that can lead to mechanical vibrations and potentially compromise the transformer’s structural integrity. Traditional methods often overlook time-varying loads and fully coupled electromagnetic-mechanical interactions, which limits the accuracy of stability assessments in realistic operational conditions. This method introduces a novel coupled finite element framework that simultaneously models electromagnetic and mechanical interactions under fluctuating load conditions. Unlike conventional electromechanical approaches, the proposed method captures time-dependent force variations and their direct impact on structural stability, enabling more accurate and realistic transformer stability assessment. External load profiles range from 48.8% to 120% of the rated load. The electromagnetic forces are calculated using the Maxwell stress tensor method, yielding a total integrated force of 4157.24 N. The maximum magnetic flux density is found to be 1.8458 T, well below the saturation point, and the core experiences a maximum electromagnetic stress of 95.91 Pa, which is significantly lower than the material yield strength of 350 MPa, resulting in a safety factor of over 3.6 × 106. The mechanical analysis shows a maximum displacement of 0.543 μm and a total RMS vibration amplitude of 0.291 μm. The modal analysis reveals a natural frequency of 66.69 Hz, distinct from the main electromagnetic excitation frequency of 120 Hz, indicating a low risk of resonance. Overall, the results confirm that the proposed framework accurately models the electromechanical behavior of transformers under fluctuating load conditions, ensuring their mechanical stability.
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