UHF局部放电传感器前端射频电路设计
发布时间：2018-10-04 21:35
【摘要】：目前,随着气体绝缘组合开关(GIS)在高压系统中应用得越来越广泛,人们对GIS局部放电检测的研究也越来越多。本文通过对超高频(UHF)局部放电检测法进行研究,总结了该检测法所存在的问题。由于局部放电发生时产生的脉冲信号强度较弱,空间电磁环境对放电信号检测产生的干扰比较大,因此,应用ADS仿真软件设计了带通、高通和带阻滤波器,滤除不同频段的干扰信号。通过对空间电磁环境以及局部放电信号的特性进行研究,给出了低噪声放大器和检波器的最佳工作频率。基于理论分析在最佳工作频率处设计低噪声放大器和检波器的匹配电路,使UHF局部放电传感器在该频率处于最佳工作状态。最后对所设计的射频电路进行测试,测试结果表明前端射频电路能有效滤除空间干扰信号,提高UHF局部放电传感器的信噪比。论文主要内容如下:(1)介绍了GIS设备的应用背景和局部放电形成的机理以及引起局部放电的主要原因,重点阐述了超高频局部放电检测法的现状以及其优缺点。(2)对射频电路设计的理论知识进行简要介绍。对滤波器与匹配电路设计的基本原理进行分析,为实际滤波器和匹配电路设计奠定理论基础。(3)介绍了超高频局部放电传感器前端射频电路的组成以及功能。由于空间电磁信号对局部放电检测造成的干扰较大,因此,应用ADS仿真软件设计带通、高通和带阻滤波器,滤除空间干扰信号。通过对空间电磁环境以及局部放电信号的特性进行研究,给出了低噪声放大器和检波器的最佳工作频率。在该频率分别对低噪声放大和对数检波进行匹配电路设计,实现UHF局部放电传感器在该频率处于最佳工作状态。(4)在实验室对UHF局部放电传感器前端射频模块的匹配电路以及滤波器性能进行测试,将实测结果与仿真模拟结果进行对比分析。将不同滤波器加在UHF局部放电传感器前端,在现场对GIS设备中局部放电信号进行测试,测试结果表明本文所设计的滤波器能有效滤除空间电磁信号干扰,提高传感器的信噪比。
[Abstract]:At present, with the application of gas insulated composite switch (GIS) in high voltage system, there are more and more researches on GIS partial discharge detection. In this paper, the UHF (UHF) partial discharge detection method is studied, and the existing problems of this method are summarized. Because of the weak intensity of pulse signal generated when partial discharge occurs and the large interference of space electromagnetic environment to the detection of discharge signal, band-pass, high-pass and band-stop filters are designed by using ADS simulation software. Filter out interference signals in different frequency bands. By studying the space electromagnetic environment and the characteristics of partial discharge signal, the optimum working frequency of low noise amplifier and detector is given. Based on the theoretical analysis, the matching circuit of low noise amplifier and detector is designed at the optimum operating frequency, which makes the UHF partial discharge sensor in the optimal working state at this frequency. Finally, the designed RF circuit is tested. The test results show that the front-end RF circuit can effectively filter the spatial interference signal and improve the signal-to-noise ratio of the UHF partial discharge sensor. The main contents of this paper are as follows: (1) the application background of GIS equipment, the mechanism of partial discharge and the main causes of partial discharge are introduced. The present situation of UHF PD detection method and its advantages and disadvantages are described. (2) the theoretical knowledge of RF circuit design is briefly introduced. The basic principle of filter and matching circuit design is analyzed in order to lay a theoretical foundation for practical filter and matching circuit design. (3) the composition and function of RF circuit in front end of UHF partial discharge sensor are introduced. Because of the large interference caused by the space electromagnetic signal to PD detection, the ADS simulation software is used to design bandpass, high-pass and band-stop filters to filter the spatial interference signals. By studying the space electromagnetic environment and the characteristics of partial discharge signal, the optimum working frequency of low noise amplifier and detector is given. The matching circuit of low noise amplification and logarithmic detection is designed at this frequency. The UHF partial discharge sensor is in the optimal working condition at this frequency. (4) the matching circuit and filter performance of the RF module in the front end of the UHF partial discharge sensor are tested in the laboratory. The measured results are compared with the simulation results. Different filters are added to the front end of the UHF partial discharge sensor and the partial discharge signals in the GIS equipment are tested in the field. The test results show that the filter designed in this paper can effectively filter the spatial electromagnetic signal interference and improve the signal-to-noise ratio of the sensor.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM595
本文编号：2251960
[Abstract]:At present, with the application of gas insulated composite switch (GIS) in high voltage system, there are more and more researches on GIS partial discharge detection. In this paper, the UHF (UHF) partial discharge detection method is studied, and the existing problems of this method are summarized. Because of the weak intensity of pulse signal generated when partial discharge occurs and the large interference of space electromagnetic environment to the detection of discharge signal, band-pass, high-pass and band-stop filters are designed by using ADS simulation software. Filter out interference signals in different frequency bands. By studying the space electromagnetic environment and the characteristics of partial discharge signal, the optimum working frequency of low noise amplifier and detector is given. Based on the theoretical analysis, the matching circuit of low noise amplifier and detector is designed at the optimum operating frequency, which makes the UHF partial discharge sensor in the optimal working state at this frequency. Finally, the designed RF circuit is tested. The test results show that the front-end RF circuit can effectively filter the spatial interference signal and improve the signal-to-noise ratio of the UHF partial discharge sensor. The main contents of this paper are as follows: (1) the application background of GIS equipment, the mechanism of partial discharge and the main causes of partial discharge are introduced. The present situation of UHF PD detection method and its advantages and disadvantages are described. (2) the theoretical knowledge of RF circuit design is briefly introduced. The basic principle of filter and matching circuit design is analyzed in order to lay a theoretical foundation for practical filter and matching circuit design. (3) the composition and function of RF circuit in front end of UHF partial discharge sensor are introduced. Because of the large interference caused by the space electromagnetic signal to PD detection, the ADS simulation software is used to design bandpass, high-pass and band-stop filters to filter the spatial interference signals. By studying the space electromagnetic environment and the characteristics of partial discharge signal, the optimum working frequency of low noise amplifier and detector is given. The matching circuit of low noise amplification and logarithmic detection is designed at this frequency. The UHF partial discharge sensor is in the optimal working condition at this frequency. (4) the matching circuit and filter performance of the RF module in the front end of the UHF partial discharge sensor are tested in the laboratory. The measured results are compared with the simulation results. Different filters are added to the front end of the UHF partial discharge sensor and the partial discharge signals in the GIS equipment are tested in the field. The test results show that the filter designed in this paper can effectively filter the spatial electromagnetic signal interference and improve the signal-to-noise ratio of the sensor.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM595
【参考文献】
相关期刊论文 前1条
1 唐炬,朱伟,孙才新,侍海军,魏钢;GIS局部放电的超高频检测[J];高电压技术;2003年12期
，本文编号：2251960
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