换流站屏蔽材料对5G辐射干扰的抑制能力分析  

Analysis of Suppression Ability of Converter Station Shielding Materials to 5G Radiation Interference

作　　者：尹琦云 杨晨 陆洪建 赵欣洋 安燕杰 陈昊阳 YIN Qiyun;YANG Chen;LU Hongjian;ZHAO Xinyang;AN Yanjie;CHEN Haoyang(Ultra-high Voltage Company,State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan 750000,Ningxia,China)

机构地区：[1]国网宁夏电力有限公司超高压公司,宁夏银川750000

出　　处：《电气传动》2023年第10期79-84,共6页Electric Drive

基　　金：国网宁夏电力有限公司检修公司2021年群众性科技创新项目(5229CG21000C)。

摘　　要：以明晰5G电磁辐射对换流站内继电保护通信控制设备的干扰影响为目标,建立了中心频率3.5GHz的微带天线仿真模型。首先分析了微带天线的电磁辐射传播衰减规律,发现由于微带贴片的非对称性,其贴片法线方向正上方或正下方方位的增益显著高于其他方位。其次,以空气为对照组,分别分析了PVC塑料、混凝土、不锈钢板等材料的干扰抑制能力,发现不锈钢板相较于其他2种材料有更好的电磁干扰屏蔽能力。最后,为保证屏蔽盒内单极子天线的正常通信需求,对不锈钢屏蔽盒的布置方式进行优化,通过在盒体上均匀开挖5 mm通孔的方式,将外部电磁干扰由66.5 dB降至30 dB。研究结果对于明确微带天线的5G辐射的空间传播规律以及屏蔽措施的合理选择提供了有益借鉴。Aiming at clarifying the interference effect of 5G electromagnetic radiation on relay protection and communication control equipment in converter station,a microstrip antenna simulation model with a center frequency of 3.5 GHz was established.Firstly,the propagation and attenuation law of electromagnetic radiation of microstrip antenna was analyzed.It is found that due to the asymmetry of microstrip patch,the gain of the direction directly above or below the normal direction of the patch is significantly higher than that of other directions.Secondly,taking air as the control group,the interference suppression ability of PVC plastic,concrete and stainless steel plate was analyzed respectively.It is found that stainless steel plate had better electromagnetic interference shielding ability than the other two materials.Finally,in order to ensure the normal communication needs of the monopole antenna in the shielding box,the layout of stainless steel shielding box was optimized,and the external electromagnetic interference was reduced from 66.5 dB to 30 dB by uniformly excavating 5 mm through holes on the box.The research results provide a useful reference for clarifying the spatial propagation law of 5G radiation of microstrip antenna and the reasonable selection of shielding measures.

关 键 词：5G通信技术 电磁辐射 增益 屏蔽材料 干扰抑制 

分 类 号：TM28[一般工业技术—材料科学与工程]