基于振动信号的电容器噪声水平计算方法  

Calculation Method of Noise Level for Capacitor Based on Vibration Signal

作　　者：曹涛[1] 汲胜昌[1] 吴鹏[1] 张晋[1] 李彦明[1] 黎小林 李岩 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [2]南方电网技术研究中心,广州510623

出　　处：《电工技术学报》2010年第6期172-177,共6页Transactions of China Electrotechnical Society

基　　金：国家科技支撑计划(2006baa02123);国家自然科学基金(50907046)资助项目

摘　　要：电容器装置的噪声是换流站中噪声来源的主要因素之一,而对单台电容器噪声水平的计算方法进行研究对合理评估整个电容器装置的噪声水平有着重要的意义。本文从单台电容器噪声的产生机理入手,即电极间的电场力将使电容器的外壳振动并最终变为噪声辐射出去,分析了噪声水平与表面振动信号之间的关系并给出其计算公式。在实验室建立了电容器表面振动和噪声信号测试系统,测量了在不同条件下电容器表面振动加速度信号,通过频谱分析验证了测得振动数据的有效性。根据文中的计算方法计算得到单台电容器的A计权声压级水平,并与半消声室内的实测噪声数据进行比较分析,验证了该计算方法的正确性。The noise of capacitor installation is one of main noise sources at converter station, so it has important significance to study noise level calculation method of a single capacitor for reasonable evaluating the noise level of the whole capacitor installation. First, the generation mechanism of capacitor noise is described in the article, the electric field force between electrodes leads to the vibration of capacitor tank and then the noise is produced and radiated out. Then the relationship between the vibration of capacitor surface and its radiation noise is analyzed, and its calculation formulas are also presented. The vibration and noise measuring system is established in the laboratory, acceleration signal in different conditions of the capacitor surface is measured, and then the data is verified by spectrum analysis. Finally, the A weighting sound pressure level （LPA） is calculated by the formulas in the article, the comparison and analysis between calculation and measurement in hemianechoic room validate the presented method.

关 键 词：电容器 振动 噪声 A计权声压级 振动加速度级 

分 类 号：TM531.5[电气工程—电器]