瞬变电磁法电阻率成像的接地网故障诊断基础研究

项目名称： 瞬变电磁法电阻率成像的接地网故障诊断基础研究

项目编号： No.51277189

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 电工技术

项目作者： 付志红

作者单位： 重庆大学

项目金额： 82万元

中文摘要： 接地网故障是影响电力系统安全的重要因素，抽样开挖不能准确判断腐蚀程度和断点，停电检修会带来经济损失，电网络法等手段尚不成熟，因此，免停机的接地网缺陷免开挖诊断技术是未来的发展方向。 研究接地网瞬变电磁建场和扩散机理，根据接地网导体大小、埋深和特有的网状结构，研究优化耦合的收发装置、激励源和接收系统。研究关断沿和过渡过程校正，一次场和二次场分离和小波去噪技术，实现三分量净二次场检测。研究感应电压平面图成像、视电阻率三维成像及考虑位移电流影响的校正方法，形成较为系统的接地网瞬变电磁法。 研究接地网导体材料、腐蚀程度、土壤电磁特性、接地网几何尺寸和网格分布，以及不同故障情况的瞬变电磁响应特征及视电阻率异常表现，借助于感应电压成像和视电阻率三维成像，提出模式识别的非接触的免开挖接地网故障诊断新方法。 本项目是本学科与地球物理学科的交叉，具有显著开创性和应用价值。

中文关键词： 瞬变电磁法；接地网；腐蚀；快速成像；诊断

英文摘要： The fault of grounding grid is an important factor to affect the Stability and safety operation of power system .Digging test, as a method applied widely, which is aimless and difficult to find the fault, influences the operation of system and causes economic losses . Researching on recognize and orientate the breaks or corrosion sites correctly without digging is a trend in the field. Because the new methods proposed in current, such as the electric network method, are imperfect and limited. So, practical and effective diagnosis methods and technology need to be further researched. This project will research the mechanism of transient electromagnetic construction and diffusion in grounding grid, the optimization device of the transmitter and receiver, the correction of transient process, the separation between the primary and secondary filed, the wavelet de-noising technology and net secondary field detection with three component, 2D imaging of induced voltage, 3D imaging of the apparent resistivity and shallow apparent resistivity correction method considering the displacement current effects. A systematic TEM method applied in the area of grounding will be bulit. We will also research how the grounding grid conductor material, the extent of corrosion, soil electromagnetic properties, the geometric size of the

英文关键词： Transient Electromagnetic；Grounding Grid；corrosion；fast Imaging；diagnosis