服役时间对变压器噪声的影响及分析  

Influence and analysis of service time on transformer noise

作　　者：林拱光 李志华 叶志达 袁佳歆[2,3] 李旭哲 莫作权 LIN Gongguang;LI Zhihua;YE Zhida;YUAN Jiaxin;LI Xuzhe;MO Zuoquan(Fujian Zhongshisuo Electric Power Testing&Commissioning Co.,Ltd.,Fuzhou 350005,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China;State Key Laboratory of Power Grid Environmental Protection,Wuhan 430072,China)

机构地区：[1]福建中试所电力调整试验有限责任公司,福建福州350005 [2]武汉大学电气与自动化学院,湖北武汉430072 [3]电网环境保护全国重点实验室,湖北武汉430072

出　　处：《武汉大学学报(工学版)》2025年第3期427-435,共9页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:U2166207)。

摘　　要：变压器是电网运行必不可少的设备,不良厂家使用报废变压器上拆卸的硅钢片制作新变压器,威胁电网的安全稳定运行。为了研究“二次片”变压器振动噪声的规律与特点,首先,阐述了硅钢片长期服役对振动噪声的影响;然后,对不同服役时间的同类变压器振动加速度幅值进行拟合,获得了饱和磁致伸缩系数-服役时间曲线;最后,借助长服役时间下变压器的振动噪声来反映“二次片”变压器的振动噪声,使用有限元仿真分析了服役时间对变压器噪声特征量的影响。研究结果表明噪声信号中基频能量比重越低、频谱复杂度越高、高低频能量比越大,则硅钢片服役年限越长,或使用“二次片”的概率越高。该研究可以初步预估变压器正常老化后的振动噪声,为进一步提出“二次片”变压器辨识的判据提供参考。Transformers are essential equipment for power grid operation.Bad manufacturers use dismantled silicon steel sheets from scrapped transformers to make new transformers,threatening the safe and stable operation of power grids.To study the law and characteristics of the vibration noise of the“secondary sheet”transformers,firstly,this paper describes the influence of long-term service of silicon steel sheet on vibration noise.Then,the vibration acceleration amplitude of similar transformers with different service time is fitted to obtain the saturation magnetostrictive coefficient-service time curve.Finally,the vibration noise of the transformer with long service time is used to reflect the vibration noise of the“secondary sheet”transformers,and the influence of service time on the noise characteristic value of transformer is analyzed by finite element simulation.The results show that the lower the fundamental frequency energy proportion,the higher the spectrum complexity and the higher the high and low frequency energy ratio in the noise signal,the longer the service life of the silicon steel sheet,or the higher the probability of using the“secondary sheet”.This study can preliminarily predict the vibration noise of transformer after normal aging,and provide a reference for further proposing the criteria for identifying“secondary chip”transformers.

关 键 词：二次片 变压器铁芯 振动噪声 有限元仿真 服役时间 

分 类 号：TM412[电气工程—电器]