电-磁-机耦合视域下考虑气隙影响的变压器铁心振动特性精细化模拟方法  

A Refined Simulation Method for the Vibration Characteristics of Transformer Core Considering the Influence of Air Gap under the Perspective of Electro-Magnetic-Mechanical Coupling

作　　者：赵小军[1] 张佳伟 王浩名 苗宇 刘兰荣 Zhao Xiaojun;Zhang Jiawei;Wang Haoming;Miao Yu;Liu LanRong(Department of Electrical Engineering North China Electric Power University Baoding 071003, China;Electric Power Research Institute of Guizhou Power Grid Co.Ltd Guiyang 550002, China;Hebei Provincial Key Laboratory of Electromagnetic&Structural Performance of Power Transmission and Transformation Equipment Baoding 071056, China)

机构地区：[1]华北电力大学电力工程系,保定071003 [2]贵州电网有限责任公司电力科学研究院,贵阳550002 [3]河北省输变电装备电磁与结构性能重点实验室,保定071056

出　　处：《电工技术学报》2024年第14期4257-4269,共13页Transactions of China Electrotechnical Society

基　　金：北京市自然科学基金项目(3212036);国家自然科学基金项目(52177006);贵州电网有限责任公司科技项目(GZKJXM20222149)资助。

摘　　要：目前,对于铁心振动计算通常采用有限元仿真来实现,但该方法计算时间长且效率低,为解决此问题,该文提出了基于机-电类比的铁心多场耦合特性精细化建模与计算方法。根据铁心步进搭接区域的结构特点,对搭接区域铁心进行磁路建模,建立考虑气隙影响的铁心等效磁路模型。根据机-电类比方法和振动理论,建立可描述变压器铁心振动的集总式和分布式等效振动回路模型,基于搭接区域磁场分布特性建立二端口级联形式的等效振动回路模型,实现了铁心振动特性的快速精准计算。搭建了叠片铁心测试平台并进行实验,通过将测量结果与计算结果对比,发现励磁电流、铁心磁通密度、位移和加速度等具有较好的一致性,验证了所提方法的有效性和准确性。Due to the combined effects of Maxwell force and magnetostrictive force,the transformer core inevitably vibrates in actual operation.The vibration of the core can cause noise pollution and loosen components.In severe cases,it may threaten the power supply reliability of the power system.Currently,finite element simulation is usually used to calculate the core vibration,but this method has a long calculation time and low efficiency.This paper proposes a refined modeling and calculation method based on the electromechanical analogy method for core multiphysics coupling characteristics.Firstly,the step overlap area of the transformer core is studied.In the presence of air gaps,the magnetic properties of a single silicon steel sheet are measured,and the equivalent magnetic properties of the overlap area are analyzed through local magnetic circuit modeling to obtain the equivalent magnetic resistance of the overlap area.Based on reasonable assumptions and simplification,the overall equivalent magnetic circuit topology of the transformer is constructed.Secondly,according to the electromechanical-electrical analogy method and mechanical vibration theory,an equivalent vibration loop model in the form of a two-port cascade is established based on the magnetic field distribution characteristics of the lap area to realize the rapid and accurate calculation of the core vibration characteristics.In addition,a vibration test platform for the single-phase three-column transformer core model is built.The data,including vibration displacement,excitation current,and core flux density under different excitation voltages,are compared with the calculation results of the model.The calculation results are in good agreement with the experimental results,which verifies the effectiveness and accuracy of the proposed method.The magnetostrictive vibration characteristics in the lap area are analyzed.The vibration of the lap region is stronger than that of the non-lap area,mainly because the local magnetic flux density in the lap region tend

关 键 词：场路耦合 磁致伸缩 叠片铁心 振动 

分 类 号：TM41[电气工程—电器]