高土壤电阻率下防雷装置的设计

Design of Lightning Protection Devices under High Soil Resistivity

为了明确在高土壤电阻率条件下雷达站防雷装置设计的不同之处,对福建省三明市新一代天气雷达站所处位置进行分析,结合其土壤电阻率极高的特点,探讨了其防雷装置的设计。该接地采用共用接地系统,且接地电阻设计值不大于4Ω。为达到该设计要求,该项目采取了接地散流网、钢管接地极、深井接地装置、外引环型接地装置等方法进行防雷装置的设计施工。探讨了深井法、笼式泄流坑等接地方式在高土壤电阻率地区的应用。复杂土壤环境下接地电阻的测试可采用零电位区漂移法。实践表明,三明市新一代天气雷达站已达到了防雷接地保护的要求,现已运行1年多,未曾受到雷电损害。该防雷装置设计可在高土壤电阻率下防雷装置的设计与施工中借鉴应用。

In order to identify the difference of the lightning protection device design of radar station under high soil resistivity condition, the lightning protection devices for new generation weather radar stations in Sanming of Fujian Province are discussed, based on the location analysis in combination with the characteristic of high soil resistivity. The common grounding system is used, and the design value of grounding resistance is less than 4 f~. In order to fill the design requirements, the project took such methods as the loose ground net, steel grounding, deep-well grounding device, external-ring grounding device, etc. for grounding device construction. The deep well method and cage type discharge pit grounding can be applied in the high soil resistivity area. The zero potential drift method can be used in the grounding resistance test of complex soil environments. The practice shows that the lightning protection devices of this station have been running more than a year without damaged by thunders and lightning, and have reached the requirements of lightning protection and grounding protection. This study can be used as a reference in other designs and construction of high soil resistivity grounding devices.