电源学报2025，Vol.23Issue(2)：133-141,9.DOI:10.13234/j.issn.2095-2805.2025.2.133
直流偏磁下大型变压器的振动和噪声特性分析及特征识别方法研究
Analysis of Vibration and Noise Characteristics of DC-biased Large-scale Transformer and Research on Characteristics Recognition Method
摘要
Abstract
Since DC bias is one of the main reasons for increases in the vibration and noise of a large-scale transformer,it is essential to fully understand the vibration and noise characteristics of large-scale transformers under DC bias for the evaluation of the operating state of transformers and the reduction of noise and vibration.A 406 MVA EHV large-scale transformer is taken as the research objective,and its vibration and noise characteristics are studied.First,based on the field-circuit coupling finite element method,the no-load operation characteristics under different DC bias currents are simulated and analyzed,and the law of excitation current under different DC biases is analyzed.Second,a multi-physics coupling model of circuit-magnetic field-solid mechanics-pressure acoustics is established,and the effective value of vibration displacement and the time-frequency characteristics of noise signal at different measuring points of the transformer under DC bias are obtained considering the influence of magnetostriction.Third,the sound level is measured at different measuring points around the transformer,and the simulated value is compared with the actual measured value to verify the effectiveness of the proposed calculation method for transformer vibration and noise.Finally,the Hilbert-Huang transform method is used to extract the vibration and noise characteristic quantities of one large-scale transformer under DC bias,and a transformer vibration characteristic recognition method based on the energy ratio of the noise signal intrinsic mode function is proposed.This method can effectively recognize the severity of DC bias of the transformer and accurately grasp its operating state,providing a theoretical basis for timely taking measures to suppress the DC bias.关键词
直流偏磁/振动噪声/多物理场耦合/变压器/本征模态函数Key words
DC bias/vibration and noise/multi-physics coupling/transformer/intrinsic mode function分类
信息技术与安全科学引用本文复制引用
李唐兵,许加柱,童涛,徐碧川,曾磊磊..直流偏磁下大型变压器的振动和噪声特性分析及特征识别方法研究[J].电源学报,2025,23(2):133-141,9.基金项目
国网江西省电力有限公司科技资助项目(5218202 0009A)This work is supported by Technology Project of State Grid Jiangxi Electric Power Co.,Ltd.under the grant 52182020009A （5218202 0009A）
