基于LabVIEW虚拟仪器的振动噪音信号分析仪的设计与实现

发布时间：2017-12-27 06:10

本文关键词：基于LabVIEW虚拟仪器的振动噪音信号分析仪的设计与实现　出处：《华南理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：在国家电网公司大力发展坚强智能电网的背景下,变压器作为电网的重要设备,其健康状态会影响整个电网的可靠性和稳定性。因此,对变压器的健康状态做出科学、合理、准确的评估,对提高电网运行的可靠性显得十分重要。振动信号中包含了振动物体大量的信息,当变压器铁芯、绕组出现异常时,振动信号往往会发生变化。由于变压器绕组、铁芯发生故障的概率比较高。因此建立在振动信号采集分析基础上的振动法逐渐在变压器在线监测领域成为了关注的焦点。本文通过对振动法的学习,结合传感器技术、信号分析技术,利用LabVIEW虚拟仪器设计开发了一套变压器振动噪音分析设备。首先,本文对变压器的工作原理、振动产生的原因与振动传播途径作了相关研究与学习,明确了振动主要来源于变压器铁芯与绕组,接着研究了变压器铁芯及绕组故障与振动之间的联系,随后又研究了几种振动信号分析处理的方法。其次,比较研究了三种常用于振动信号采集的传感器,根据变压器的振动信号的特点,完成了对数据采集硬件设备的选型工作,主要是传感器与数据采集卡的选择,并用DAQmx实现了软硬件的连接工作。同时从软件设计角度对数据采集功能、数据分析功能、数据库功能进行了设计。最后,本文利用LabVIEW作为开发平台,通过编程实现了变压器振动信号的数据采集以及相关功能界面的搭建工作。实现的功能界面包括系统登入界面、时域分析功能界面、频谱分析功能界面、功率谱分析功能界面、小波分析功能界面。同时将数据存入到了SQL-Server数据库,并实现了数据管理工作。
[Abstract]:In the background of developing strong smart grid by the national Power Grid Corp, transformer as an important equipment of the power grid, its health will affect the reliability and stability of the whole power grid. Therefore, the scientific, reasonable and accurate assessment of the health of the transformer is very important to improve the reliability of the power grid operation. The vibration signal contains a lot of information of the vibrating object. When the transformer core and windings appear abnormal, the vibration signals often change. The probability of fault of transformer winding and iron core is high. Therefore, the vibration method based on the vibration signal acquisition and analysis has gradually become the focus of attention in the field of transformer on-line monitoring. In this paper, a set of transformer vibration and noise analysis equipment has been designed and developed by means of the learning of vibration method, combined with sensor technology and signal analysis technology, using LabVIEW virtual instrument. First of all, the reason and the vibration transmission principle, the transformer vibration made the relevant research and learning, the vibration mainly comes from the transformer core and windings, then study between the transformer core and winding fault and vibration, then studied several methods of vibration signal analysis and processing. Secondly, a comparative study of three kinds of sensors used in vibration signal acquisition, according to the characteristics of vibration signal of the transformer, completed the selection of hardware of the data acquisition, mainly sensor and data acquisition card, and connect the work of hardware and software is implemented by DAQmx. At the same time, the function of data acquisition, data analysis and database are designed from the point of view of software design. Finally, this paper uses LabVIEW as the development platform, and realizes the data acquisition of transformer vibration signal and the construction of the related functional interface through programming. The implementation of the functional interface includes system login interface, time domain analysis function interface, spectrum analysis function interface, power spectrum analysis function interface and wavelet analysis function interface. At the same time, the data is stored in the SQL-Server database, and the data management is realized.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM41;TB53

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