变压器绕组轴向振动模型及固有振动特性影响因素研究  

Study on Axial Vibration Model and Influence Factors of Inherent Vibration Characteristics of Transformer Winding

作　　者：刘力卿 马小光[2] 李雪[1] 何金 朱筱瑜 薛鑫[3] 张凡[3] LIU Liqing;MA Xiaoguang;LI Xue;HE Jin;ZHU Xiaoyu;XUE Xin;ZHANG Fan(Electric Power Research Institute of State Grid Tianjin Electric Power Co.,Ltd.,Tianjin 300384,China;State Grid Tianjin Electric Power Co.,Ltd.,Tianjiang 300384,China;State Key Laboratory of Power Equipment and Electrical Insulation,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国网天津市电力公司电力科学研究院,天津300384 [2]国网天津市电力公司,天津300384 [3]西安交通大学电力设备与电气绝缘国家重点实验室,西安710049

出　　处：《高压电器》2023年第4期149-155,共7页High Voltage Apparatus

基　　金：国家电网公司科技项目(变压器短路后状态再评估关键技术研究)。

摘　　要：大型电力变压器绕组的固有振动特性影响其在短路冲击电流下的振动响应及抗短路能力。为了弄清楚固有振动特性与绕组机械参数间的关系,文中建立了计及压板和线圈的绕组轴向振动“质量—弹簧—阻尼”模型,提出了等效质量、刚度和固有振动特性的计算方法。在此基础上,分析了一台SFSZ8-40000/110变压器低压绕组的模态频率和振型,研究了垫块弹性模量、数量和端圈垫块厚度等因素对绕组固有振动特性的影响规律。研究结果表明,绕组各阶轴向振动模态频率之间满足倍数关系,各阶频率对应的振型为绕组不同位置线饼沿轴向的同向和反向振动;模态频率随垫块弹性模量、数量的增大而增大,端部振动位移随端圈垫块厚度的增大而增大。研究结论可为进一步计算绕组动态响应和抗短路能力校核提供重要依据。The inherent vibration characteristic of large transformer winding affects its vibration response and short circuit resistance ability under short impulse current.In order to understand the relationship between the inherent vi⁃bration characteristic and mechanical parameters of the winding,the“mass⁃spring⁃damping”model of the axial vibra⁃tion of the winding considering the clamp and coil is set up in this paper.The equivalent mass and the calculation method of inherent characteristics are proposed.On this basis,the modal frequency and vibration of low voltage winding of one set of SFSZ8⁃40000/110 transformer are analyzed,and the influence of such factors as elastic modulus and number of spacers as well as the thickness of the end washers on the inherent vibration characteristics is studied.The study results show that the frequency of each order of axial vibration mode meets the multiple relationship,the vi⁃bration mode corresponding to frequencies of each order is the same and opposite direction vibration of disc along the axial direction with the winding at different positions.The modal frequency increases with the increase of the elastic modulus and quantity of the spacers,while the end vibration increases with the increase of thickness of end spacer.The study conclusion can provide important basis for calculation of dynamic response of winding and verification of short circuit resistance capability further.

关 键 词：振动模型 变压器绕组 轴向振动 模态特性 

分 类 号：TM41[电气工程—电器]