摘要
针对变压器在直流扰动下的噪声问题,提出一种电磁-机械-声的多物理场耦合方法。构建三相变压器三维电磁模型,求解三相变压器在偏磁效应下的内部构件磁场与受力情况。利用电磁-机械耦合原理计算铁心和线圈的振动加速度,并基于机械-声耦合原理进一步建立声学波动模型,计算空间声压分布。以Yd接线三相三柱式变压器为例,仿真研究多种交直流混杂模式下的电磁、振动及噪声状态,总结其模-态特征及变化规律。搭建变压器偏磁动模实验平台,测量振动噪声参数,并与仿真结果对比,验证所提方法与结论的正确性和有效性。通过分析变压器偏磁效应噪声特性,为基于信息物理融合的设备状态监测与故障辨识提供新思路。
In view of the noise problem when the transformer is subject to DC disturbance,the existing scholars have carried out preliminary research on this problem,but have not deeply explored the internal correlation of electromagnetic,vibration and acoustic wave cooperative coupling propagation evolution when the transformer is subject to DC magnetic bias.Based on the coupling of multiple physical fields,this paper focuses on the DC bias noise characteristics of transformer.Based on electromagnetism,the information transmission path of magnetic field force field sound field is analyzed,and a sequential coupling model of multiple physical fields is constructed.Firstly,the electromagnetic mechanical acoustic model of transformer magnetic bias effect is established.Based on electromagnetic coupling,a dynamic information base for virtual simulation of multiple physical fields is established.According to the time point index,the vibration acceleration of transformer winding and iron core is calculated with electromagnetic information as excitation;The sound pressure and sound pressure level of the winding and iron core are calculated by taking the vibration acceleration as the excitation and substituting it into the sound field propagation domain.Establish dynamic multi field physical information base.The simulation model of three-phase transformer is established,and different measuring points are selected.Based on the sequential coupling of multiple physical fields,the changes of winding magnetic leakage,Lorentz force,acceleration,noise,core vibration and noise under different DC disturbance modes are simulated and analyzed.The simulation results show that:firstly,under the DC disturbance,the magnetic flux leakage,Lorentz force,vibration acceleration,sound pressure and current of the transformer winding have similar change laws,showing the asymmetric change characteristics of"half wave enhancement and half wave attenuation";Secondly,the vibration and noise of transformer magnetic bias effect mainly come from the iron core.A three-phase transformer dynamic simulation test platform is built,and the test points consistent with the simulation are selected to measure the vibration and noise of the transformer under different modes.The experimental results show that the experimental noise has the same trend as the simulated noise.Aiming at the vibration and noise problems of transformer,the magnetic bias noise suppression measures are proposed from the aspects of physical information monitoring and capacitance isolation.Through the comparison between simulation and experiment,the following conclusions are drawn:(1)Under DC disturbance,the vibration and sound pressure of iron core and winding change obviously;The noise increases with the increase of DC interference.The abnormal noise of transformer magnetic bias effect mainly comes from the iron core.The consistency between simulation results and experimental data verifies the correctness of this method.(2)The physical process of transformer magnetic bias effect and abnormal feature information of vibration and noise are fused,and the morphological characteristics of vibration and noise of transformer magnetic bias effect are analyzed from the perspective of multi-dimensional,multi temporal and spatial scales and multi field information.The key electromagnetic parameters are identified through measurable electrical information to reflect other unmeasurable physical characteristics.
作者
潘超
安景革
刘闯
蔡国伟
孙正龙
罗远翔
Pan Chao;An Jingge;Liu Chuang;Cai Guowei;Sun Zhenglong;Luo Yuanxiang(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy TechnologyMinistry of Education Northeast Electric Power University,Jilin 132012 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2023年第18期5077-5088,共12页
Transactions of China Electrotechnical Society
基金
国家重点基础研究发展计划资助项目(2021YFB2400802)。
关键词
直流扰动
有限元法
多场耦合
噪声
DC disturbance
finite element method
multi-field coupling
noise
作者简介
潘超,男,1981年生,博士,教授,主要研究方向为电力系统稳定与电磁兼容。E-mail:31563018@qq.com;通信作者:安景革,男,2000年生,博士,主要研究方向为变压器内部故障辨识。E-mail:1125462364@qq.com。
