基于有限元法的直流偏置下 110 千伏变压器的振动和噪声机理

IF 1.9 Q4 ENERGY & FUELS
Ziyang Li , Xujun Lang , Bo Yang , Xiaolin Liu , Hao Wang , Zhang Li
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引用次数: 0

摘要

全球能源和环境问题日益突出,其中分布最广的 110 千伏变压器的振动和噪声问题引起了业内外的广泛关注。直流偏置是变压器正常运行时产生振动噪声的主要因素之一。为阐明直流偏置下 110 kV 变压器的振动和噪声机理,采用有限元法建立了 110 kV 变压器的多场耦合模型。通过与交流、谐波和直流电源的功率频率并联的场回路耦合,对直流偏置过程中的电磁、振动和噪声特性进行了比较和量化。研究发现,直流偏置会导致铁芯和绕组的磁通密度、磁力和位移分布发生严重扭曲。在 Kdc = 0.85 时,直流偏置效应对铁芯和绕组的贡献不同。此时,铁芯接近饱和,铁芯磁力和位移的增加速度减慢。然而,铁芯的饱和增加了漏磁通量,绕组的应力和位移增加得更快。110 kV 变压器在直流偏置下的声场分布特性与力特性有关。当直流偏置系数为 1.25 时,噪声声压级达到 73.6 dB。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Vibration and noise mechanism of a 110 kV transformer under DC bias based on finite element method

Global energy and environmental issues are becoming increasingly problematic, and the vibration and noise problem of 110 kV transformers, which are the most widely distributed, have attracted widespread attention from both inside and outside the industry. DC bias is one of the main contributing factors to vibration noise during the normal operation of transformers. To clarify the vibration and noise mechanism of a 110 kV transformer under a DC bias, a multi-field coupling model of a 110 kV transformer was established using the finite element method. The electromagnetic, vibration, and noise characteristics during the DC bias process were compared and quantified through field circuit coupling in parallel with the power frequency of AC, harmonic, and DC power sources. It was found that a DC bias can cause significant distortions in the magnetic flux density, force, and displacement distributions of the core and winding. The contributions of the DC bias effect to the core and winding are different at Kdc = 0.85. At this point, the core approached saturation, and the increase in the core force and displacement slowed. However, the saturation of the core increased the leakage flux, and the stress and displacement of the winding increased faster. The sound field distribution characteristics of the 110 kV transformer under a DC bias are related to the force characteristics. When the DC bias coefficient was 1.25, the noise sound pressure level reached 73.6 dB.

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来源期刊
Global Energy Interconnection
Global Energy Interconnection Engineering-Automotive Engineering
CiteScore
5.70
自引率
0.00%
发文量
985
审稿时长
15 weeks
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