间谐波激励下铁心振动噪声特性研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (22) : 78-83.

论文

间谐波激励下铁心振动噪声特性研究

邢琳1，张帅1，李燕1，吴鹏1，甘浩2，李金博2

作者信息 +

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

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

Author information +

文章历史 +

摘要

近年来新能源系统容量不断增大，增加了间谐波在电网中的含量，加剧了电力变压器的振动和噪音。通过搭建含任意间谐波的变压器振动噪声实验平台，进行间谐波激励下的铁心振动实验，对振动频谱中间谐波分量成因进行了数学分析；进行铁心噪声实验，分析间谐波对A计权噪声级和1/3倍频程频谱中各分量的影响规律；建立磁-结构力场-声场多物理耦合有限元三维模型，对间谐波激励下的铁心噪声进行仿真计算，并与实验值进行对比。结果表明，振动频谱中间谐波分量呈一定规律且成对出现，相比工频激励，间谐波下铁心的噪声值更大，同时各频段声压级升高，实验结果与仿真结果有较好的一致性，低频低含量间谐波对变压器性能有较大影响，应对其重点防范并在设计阶段结合考虑。

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.

导出引用

邢琳1，张帅1，李燕1，吴鹏1，甘浩2，李金博2. 间谐波激励下铁心振动噪声特性研究[J]. 振动与冲击, 2023, 42(22): 78-83

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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