同轴电缆耦合强电磁脉冲特性分析  

Strong Electromagnetic Pulses Characteristics of Coaxial Cable Coupling

作　　者：李祥超[1] 王贤超 欧阳文 王兵 LI Xiangchao;WANG Xianchao;OUYANG Wen;WANG Bing(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,南京210044

出　　处：《电瓷避雷器》2023年第4期1-8,17,共9页Insulators and Surge Arresters

基　　金：国家重点研发计划(编号:2017YFC1501505)。

摘　　要：针对同轴电缆耦合强电磁脉冲产生的感应过电压对同轴电缆终端设备造成暂时或永久性损害的问题,用理论和试验相结合的方法,采用有界波模拟器模拟2.3/23 ns电场波形,选用SYN-75-3-1-64网无氧铜008M型号的监控线作为同轴电缆耦合对象进行试验,得出以下结论:1)当场间电场强度作为自变量时,随着电场强度的增大同轴电缆耦合到的电压也会变大;2)电场强度一定时,同轴电缆在电场中耦合到的电压会随着耦合长度的增加而变大;3)同轴电缆耦合到的电压还与摆放角度相关,同轴电缆与电场方向的夹角越大,耦合到的电压会越小;4)同轴电缆屏蔽层接地时,加上75Ω的匹配阻抗相比于开路情况下耦合到的电压会有明显的减小。这些结论对于探究同轴电缆在强电磁脉冲下的防护具有一定的意义。In order to solve the problem of temporary or permanent damage to terminal equipment of coaxial cable caused by induced overvoltage generated by strong electromagnetic pulse of coaxial cable coupling,the electric field waveform of 2.3/23 ns is simulated by using bounded wave simulator with the method of combining theory and experiment.The monitoring line of 008M model of oxygen-free copper of SYN-75-3-1-64 network is selected as the coupling object of coaxial cable for the test.The conclusions are as follows:when the field strength between sites is taken as the independent variable,the voltage to which the coaxial cable is coupled will increase with the increase of the electric field strength;When the electric field intensity is constant,the coupled voltage of the coaxial cable in the electric field will increase with the increase of the coupling length.The coupled voltage of the coaxial cable is also related to the placement angle.The greater the included angle between the coaxial cable and the direction of the electric field,the smaller the coupled voltage will be.When the shielding layer of coaxial cable is grounded,the matched impedance of 75Ωwill be significantly reduced compared with the coupled voltage in the open circuit.These conclusions have certain significance for exploring the protection of coaxial cable under the strong electromagnetic pulse.

关 键 词：同轴电缆 强电磁脉冲 耦合 电场强度 

分 类 号：TM248.3[一般工业技术—材料科学与工程]