基于EGM模型的输电通道雷电绕击风险数字化评估现状与展望

Review and Expectation of Lightning Shielding Failure Risk Digital Evaluation for Transmission Lines Based on EGM

雷电绕击风险量化评估是架空输电线路防雷的重要依据,有助于确定线路防雷薄弱点,实施针对性的防雷措施。首先,归纳了各类典型线路地貌,阐述了地形地貌及线路结构对绕击风险产生的影响与开展全通道精细化、分相精准评估的价值;其次,开展了架空线路绕击风险评估典型模型特点分析,结合工程易实施性,给出了采用电气几何模型(electro-geometric model,EGM)开展输电线路雷电绕击风险评估数字化、精细化的建议;然后,梳理了基于EGM模型的输电线路绕击风险评估模型参数提取与数据组织技术现状,指出现行技术存在参数提取智能化程度浅、数据组织表现力弱、信息分散等问题;最后,从激光雷达点云数据的采集处理、EGM模型参数的智能提取、评估对象及数据融合增效等方面进行了趋势与挑战讨论,其中参数提取的小颗粒度遍历自动实现、数据组织展示的3维立体化与多源协同增效将是未来的研究重点。研究成果可为数字技术在输电通道雷电绕击风险评估中的深化应用提供一定的参考。

The quantitative evaluation of lightning shielding risk is an important basis for lightning protection of overhead transmission lines,which is helpful to determine the weak points of lightning protection and implement targeted lightning protection measures.Firstly,all kinds of typical line landforms are summarized;meanwhile,the impacts of landform and line structure on lightning shielding risk,as well as the value of whole line corridor refinement and split-phase accurate evaluation,are expounded.Secondly,the characteristics of typical models of overhead line lightning shielding risk evaluation are analyzed,and some suggestions on the digitization and refinement of lightning shielding risk evaluation of transmission line based on electro-geometric model(EGM)are put forward in combination with the ease of project implementation.Then,the research status of model parameter extraction and data organization technology of transmission line shielding risk evaluation based on EGM is combed,and some problems of the current technology are pointed out,such as shallow intelligence of parameter extraction,weak expressiveness of data organization,information dispersion and so on.Finally,the trends and challenges are discussed from the aspects of lidar point cloud data acquisition and preprocessing,intelligent extraction of EGM parameters,evaluation objects and data fusion efficiency,among which the automatic realization of small particle size traversal for parameter extraction and the three-dimensional visualization and multi-source synergy for data organization and display will be the future research priorities.The research results can provide a certain reference for deepening application of digital technology in lightning shielding risk evaluation of transmission lines.