冬奥会保障项目地电阻率台站防雷技术系统设计关键技术

Key Design Techniques of a Lightning Protection System for the Geoelectrical Resistivity Monitoring Stations in the Winter Olympic Games Security Project

雷电危害是影响地震台站稳定运行的重要因素之一,对台站进行雷电防护具有重要意义。介绍冬奥会保障项目地电阻率台站改造中避雷系统的设计,并重点分析研究地电阻率台站架空线路防雷、地埋线路防雷等关键技术点出现的问题,探讨地电阻率台站综合防雷系统在接地网、供电、综合布线等方面的整体设计,最后设计完成宝昌台防雷技术系统。在此基础上,完成项目全部8个台站的避雷系统方案设计,全面提升冬奥会项目台站的防雷实效。通过计算,在项目深化研究中得到一些新的技术成果:(1)地电阻率台站应尽量将供电及测量线路进行埋地;(2)埋地供电及测量线路应避开接地体10 m以上;(3)仍采用架空线路的台站可以安装相应电流值的信号防雷器。研究成果可供今后全国台站防雷系统建设时参考。

Lightning damage is one of the important factors that affect the stable operation of seismic stations;thus,it is of significance to protect the stations from lightning.This study introduced the design of a lightning protection system for the geoelectrical resistivity monitoring stations in the Winter Olympic Games security project.Through the analysis of problems in the key design techniques of the lightning protection system,the overall design of a comprehensive lightning protection system in terms of the aspects of grounding grid,power supply,and comprehensive wiring was discussed,and the lightning protection system at Baochang Station was designed.On this basis,the design of the lightning protection system of all eight stations in the project was completed,and the effectiveness of the lightning protection system of the stations was improved.In this study,some new technical achievements were attained,i.e.,(1)the power supply and measuring lines were buried;(2)the buried power supply and measuring lines were more than 10 m from the grounding body;and(3)the network signal lightning arrester with corresponding current values was installed in the stations that still used overhead lines.These research results can be used as a reference for the construction of the lightning protection system for national stations in the future.