加油站雷击电磁场影响分析及危害范围界定

Impact Analysis and Damaging Range Definition of Lightning-Induced Electromagnetic Field in Gas Station

为确定加油站雷击电磁脉冲的防护水平和安全间距,根据雷电流特性和油品燃烧爆炸性质,采用ADTD闪电定位系统监测资料,通过对重庆华兴加油站的防雷安全评估,重点分析加油站遭受临近雷击或自身遭受雷击后雷击电磁场影响及起火、爆炸的危害范围。结果表明:在加油站周边防雷设施能保护距离加油站33.54～41m范围的情况下,加油站遭受临近雷击时雷击所产生的电磁场可不考虑;加油站遭受直击雷时,应采用小于5m×5m的屏蔽网格才能使LPZ1区的电磁场处于安全状态;加油站因雷击起火或爆炸的危害范围分别为5.22m和138.95m。结论可为加油站的雷电设防要求及周边规划提供理论依据。

In order to determine the protection level and security spacing of lightning electromagnetic pulses around gas stations,based on the characteristics of lightning current and the explosive nature of oil combustion,the effects of the lightning electromagnetic field and the damage range of fire and explosion resulted from a nearby lightning stroke or a direct lightning stroke around the gas station are analyzed with the lightning monitoring data of the ADTD system,through assessing the lightning safety of the Chongqing Huaxing gas station.The results indicate that,if the distance between devices and station is 33.54 m to 41 m,the impact of the electromagnetic field generated by a lightning stroke can be neglected when the station is stroked by lightning;the using of the shielding grids less than 5 m×5 m is a condition of safety for the electromagnetic field of LPZ1 when the station is stroked by lightning;the distances of damaging range are 5.22 m and 138.95 m,respectively,when the station is on fire or explosive because of lightning.These provide a theoretical basis for the lightning protection and construction planning of a gas station and the surrounding area.