地铁弓网电弧对机场仪表着陆系统影响研究

摘要

In order to study theoretically the influence of the metro pantograph arc on the airport navigation sys-tem,based on the theory of radio wave propagation and relevant requirements of GB/T 24338,the electromag-netic radiation of underground and ground lines was tested respectively,under the scenario of one of domestic subway lines being selected,when the metro worked in full load and full-level traction.In the underground sec-tion,the insulated overlap was chosen as the test point to test the underground shielding effectiveness.In the ground section,the locations at the section insulator,insulated overlap and uninsulated overlap,where arc oc-curs more frequently,were selected to obtain the electromagnetic radiation characteristics of standard 10 m measurement method.According to the requirement of GB/T 6364 related protection rate,the electromagnetic compatibility of arc radiation was analyzed.The relationship between the protection distance and the radiation intensity of the pantograph arc was given.The results show that the arc radiation of the underground section will not affect the navigation facilities of the airport.The electromagnetic interference at the insulated overlap is the largest on the ground section,with peak detection data reaching 68.47 dBμV/m at the localizer.When the distance between the metro line and runway is greater than 63.96 m,the arc radiation of the metro line will not affect the airport navigation system.The results of the paper can provide a technical basis for the rationality and feasibility of the site selection of subway and airport.%为了从理论上研究地铁弓网电弧对机场仪表着陆系统的影响.基于电波传播理论并结合GB/T 24338相关要求,选取国内地铁线路,在地铁满载全级牵引工况下,分别对地下线路和地上线路的电磁辐射进行测试.地下区段选取绝缘锚段关节为测试点进行地下屏蔽效能测试;地上区段选取分段绝缘器、绝缘锚段关节、非绝缘锚段关节等几个发生电弧较为频繁的位置,获得标准10 m测量方法处的电磁辐射特性,并结合GB/T 6364相关保护率要求,对电弧辐射进行电磁兼容影响分析,给出了保护距离与弓网辐射强度的关系.研究结果表明:地下区段的电弧辐射不会对机场导航设施造成影响;地上区段绝缘锚段关节处的电磁干扰最大,在航向信标处峰值检波数据达到68.47 dBμV/m;当地铁线路与跑道下滑线的距离大于63.96 m时,该地铁线路电弧辐射不会对机场仪表着陆系统造成影响.本文的研究结果可为地铁线路和机场选址的合理性和可行性提供技术依据.