基站天线与输电线路共建时周围电磁环境分析

Analysis of electromagnetic environment around the tower of base station antenna and transmission line

基站天线与输电线路杆塔的共享是实现资源整合、节约国家资源的有效途径,研究此类共建站对周围电磁环境的影响,可为其安全应用提供参考依据。文章监测已建浦口区110 kV的锦湖支线7号塔和旺兰#1线3号塔两个共建站周围的电磁环境指标,对不同频率段、不同影响机理的关键电磁环境指标赋予了不同的权重,采用GB 8702—2014《电磁环境控制限值》中规定的不同频率段应满足的关系式分别进行加权计算,分析了共建站的电磁环境影响特点和环境保护要求的相符性。结果表明:输电线路产生的工频电场影响随着与输电线路距离的增加而逐渐衰减;共建站对周围电磁环境的影响中,射频电磁影响占有相对主导地位;射频电磁场和工频电磁场的共同影响仍然满足不同频率段的关系式要求。

The sharing of base station antenna and transmission line power tower is an effective way to realize the integration of resources and save national resources.The study of its impact on the surrounding electromagnetic environment can provide a reference for the safe application of such Coconstruction Station.Through the monitoring and analysis of the electromagnetic environment indexes around the No.7 tower of the 110 kV Jinhu branch line and the No.3 tower of the 110 kV wanglan#1 line in Pukou District,and it is the first time to try to give different weights to the key electromagnetic environment indexes of different frequency segments and different influence mechanisms,and use the relationship formula specified in Control Limits for Electromagnetic Environment(GB 8702-2014)that different frequency segments should meet to carry out weight calculation respectively,the characteristics of the electromagnetic impact of the co construction station and the compliance of the environmental protection requirements is analysis and studied.The results show that the influence of power frequency electric field produced by transmission line decreases with the increase of distance from transmission line,and radio frequency electromagnetic impact is relatively dominant in the electromagnetic impact produced by the"Co Construction Station"on the environment.However,the common influence of RF electromagnetic field and power frequency electromagnetic field on the environment still meets the relationship requirements of different frequency bands.