Vibration and noise characteristics of the core of a power transformer under interharmonic excitation

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (22) : 78-83.

XING Lin1，ZHANG Shuai1，LI Yan1，WU Peng1，GAN Hao2，LI Jinbo2

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Abstract

In recent years, the capacity of new energy systems has been increasing, which increases the content of interharmonics in the power grid and aggravates the vibration and noise of power transformers. By building a transformer vibration and noise experimental platform with arbitrary interharmonics, the core vibration experiment under interharmonic excitation is carried out, and the causes of the intermediate harmonic components in the vibration spectrum are analyzed mathematically. The core noise experiment is carried out to analyze the influence of interharmonics on the A-weighted noise level and each component in the 1 / 3 octave spectrum. A multi-physical coupling finite element three-dimensional model of magnetic-structural force field-sound field is established. The core noise under interharmonic excitation is simulated and compared with the experimental values. The results show that the intermediate harmonic components of the vibration spectrum appear in pairs in a certain law. Compared with the power frequency excitation, the noise value of the core under the interharmonics is larger, and the sound pressure level of each frequency band increases. The experimental results are in good agreement with the simulation results. The low frequency and low content interharmonics have a great influence on the performance of the transformer. It should be focused on prevention and considered in the design stage.

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Interharmonics / Multi-physics coupling / Finite element / Spectrum

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XING Lin1，ZHANG Shuai1，LI Yan1，WU Peng1，GAN Hao2，LI Jinbo2. Vibration and noise characteristics of the core of a power transformer under interharmonic excitation[J]. Journal of Vibration and Shock, 2023, 42(22): 78-83

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