雷击架空输电线路暂态电流行波仿真与模式识别方法研究
发布时间：2018-10-12 12:07
【摘要】：开展直击雷模式识别的研究是分析雷击事故原因和鉴定雷击故障责任的基础，可为架空输电线路差异化防雷的设计及改造提供重要的技术手段。本文在分析国内外雷击架空输电线路类型识别的研究现状的基础上，从识别方法以及测量手段两个方面对架空输电线路直击雷类型识别进行了研究。 本文首先基于ATP-EMTP仿真软件，建立了装有暂态电流行波监测系统的实际输电线路仿真模型，，考虑到避雷线对雷电的屏蔽效果，对雷电绕击与雷击塔顶情况选取了不同幅值范围的雷电流进行仿真，并结合雷击架空输电线路后导线上电流产生的物理过程对各种雷击情况下三相导线电流的波形特点进行分析。 其次，针对雷击所造成的多种闪络情况，基于输电线路导线之间的空间电磁耦合分析，通过三相导线之间的能量比值关系判断雷电流注入相数，将直击雷初步分为3类。此外，通过提取各个子分类中的导线电流波形的时域与频域特征构建识别判据，最终实现输电线路直击雷的识别。在此基础上在.NET平台上采用C#语言编写了输电线路雷击类型识别程序并对实测数据的雷击类型进行了初步分析。 最后，为了能更加深入对直击雷类型进行分析，在测量雷击架空输电线路引起的暂态电流行波的同时对导线上工频电流进行监测，对各向异性磁阻传感器测量架空输电线路导线上电流的基本原理进行分析，设计了一款基于各向异性磁阻传感器的电流的测量装置。同时，为了解决各向异性磁阻传感器暴露在强磁场下测量灵敏度下降的问题设计并测试了置位/复位电路。通过在实验室构建工频电流以及雷电流模拟实验环境，对所设计的电流测量装置进行了性能测试，测试表明该装置能实现对导线上工频以及暂态电流的非接触式测量，并且具有安全性好、体积小等优点。
[Abstract]:The research of direct lightning pattern recognition is the basis of analyzing the cause of lightning strike accident and identifying the responsibility of lightning strike fault. It can provide an important technical means for the design and reconstruction of overhead transmission line differential lightning protection. On the basis of analyzing the research status of lightning strike overhead transmission line type identification at home and abroad, this paper studies the identification of direct strike lightning type of overhead transmission line from two aspects: identification method and measurement method. In this paper, based on the ATP-EMTP simulation software, the simulation model of the actual transmission line with transient current traveling wave monitoring system is established, considering the lightning shielding effect of the lightning protection line. The lightning current with different amplitudes is selected to simulate the lightning around and the top of the tower. Combined with the physical process of the current generation on the conductor after lightning strike, the waveform characteristics of the three-phase conductor current under various lightning strike conditions are analyzed. Secondly, aiming at various flashover situations caused by lightning strike, based on the analysis of space electromagnetic coupling between transmission line conductors, the number of lightning current injected phase is judged by the energy ratio relationship between three phase conductors, and the direct strike lightning is divided into three categories. In addition, the identification criterion is constructed by extracting the time-domain and frequency-domain characteristics of traverse current waveforms in each sub-classification, and finally realizing the identification of direct strike lightning on transmission lines. On the basis of this, the program of lightning strike type identification of transmission line is compiled by using C # language on .NET platform, and the lightning strike type of measured data is analyzed preliminarily. Finally, in order to analyze the type of direct lightning strike more deeply, the transient current traveling wave caused by lightning strike overhead transmission line is measured and the power frequency current on the wire is monitored at the same time. The basic principle of measuring the current on overhead transmission lines with anisotropic magnetoresistive sensor is analyzed. A measuring device based on anisotropic magnetoresistive sensor is designed. At the same time, in order to solve the problem that the sensitivity of anisotropic magnetoresistive sensor decreases when exposed to high magnetic field, a position / reset circuit is designed and tested. By constructing the power frequency current and lightning current simulation environment in the laboratory, the performance of the designed current measuring device is tested. The test results show that the device can realize the non-contact measurement of the power frequency and transient current on the wire. The utility model has the advantages of good safety and small size.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM863
本文编号：2266047
[Abstract]:The research of direct lightning pattern recognition is the basis of analyzing the cause of lightning strike accident and identifying the responsibility of lightning strike fault. It can provide an important technical means for the design and reconstruction of overhead transmission line differential lightning protection. On the basis of analyzing the research status of lightning strike overhead transmission line type identification at home and abroad, this paper studies the identification of direct strike lightning type of overhead transmission line from two aspects: identification method and measurement method. In this paper, based on the ATP-EMTP simulation software, the simulation model of the actual transmission line with transient current traveling wave monitoring system is established, considering the lightning shielding effect of the lightning protection line. The lightning current with different amplitudes is selected to simulate the lightning around and the top of the tower. Combined with the physical process of the current generation on the conductor after lightning strike, the waveform characteristics of the three-phase conductor current under various lightning strike conditions are analyzed. Secondly, aiming at various flashover situations caused by lightning strike, based on the analysis of space electromagnetic coupling between transmission line conductors, the number of lightning current injected phase is judged by the energy ratio relationship between three phase conductors, and the direct strike lightning is divided into three categories. In addition, the identification criterion is constructed by extracting the time-domain and frequency-domain characteristics of traverse current waveforms in each sub-classification, and finally realizing the identification of direct strike lightning on transmission lines. On the basis of this, the program of lightning strike type identification of transmission line is compiled by using C # language on .NET platform, and the lightning strike type of measured data is analyzed preliminarily. Finally, in order to analyze the type of direct lightning strike more deeply, the transient current traveling wave caused by lightning strike overhead transmission line is measured and the power frequency current on the wire is monitored at the same time. The basic principle of measuring the current on overhead transmission lines with anisotropic magnetoresistive sensor is analyzed. A measuring device based on anisotropic magnetoresistive sensor is designed. At the same time, in order to solve the problem that the sensitivity of anisotropic magnetoresistive sensor decreases when exposed to high magnetic field, a position / reset circuit is designed and tested. By constructing the power frequency current and lightning current simulation environment in the laboratory, the performance of the designed current measuring device is tested. The test results show that the device can realize the non-contact measurement of the power frequency and transient current on the wire. The utility model has the advantages of good safety and small size.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM863
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