快沿脉冲场下传输线等效电路模型的验证与分析
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摘要
电磁脉冲会通过传输线干扰其端接的电子器件、设备及系统,传输线正是其主要的能量耦合通道。为研究快沿电磁脉冲场对端接非线性负载的传输线的耦合规律,建立了外场激励下多导体传输线的PSPICE等效电路模型。以平面波辐照于一根理想地面上水平架空传输线为例,用MATLAB编程计算验证了PSPICE模型的正确性及解决非线性负载的可行性。利用方波脉冲源和双指数脉冲源注入GTEM室产生的近似均匀平面波分别对双导体传输线和多芯传输线进行了辐照试验,与PSPICE模型仿真结果具有较高的一致性。分别利用不同脉宽、峰值、上升沿和下降沿的梯形脉冲场辐照双导体传输线,通过PSPICE模型仿真发现:脉冲场峰值越大,负载感应电压越高;感应电压只出现在梯形脉冲场上升沿和下降沿处;脉冲场上升沿或下降沿越陡,感应电压幅值越高。同时,通过仿真发现线缆的半径、长度、两线间的距离等都对负载的感应电压有影响。这些结果对进一步研究电磁脉冲的防护技术具有指导意义。
The electromagnetic pulse can interfere the electronic devices,equipment,and system through the transmission line.To investigate the coupling mechanism between the electromagnetic pulse and the transmission lines with nonlinear loads,the PSPICE models for the multi-conductor transmission line illuminated by the incident field are built.For a line above a perfectly conducting plane illuminated by the incident field,the solutions obtained by MATLAB and PSPICE simulation are the same,and the line terminated with transient voltage suppressor is simulated easily by PSPICE.A double-conductor transmission line is irradiated by the square pulse field in the GTEM cell,and a multi-core cable is irradiated by double exponential pulse field in the GTEM cell.The results of simulations and the experiments are consistent with each other.A double-conductor transmission line irradiated by different square pulse fields is simulated.The results show that the voltage on the load will be higher when the pulse amplitude become higher.When the rising edge or falling edge of the square pulse field becomes shorter,the induced voltage on the load will be higher accordingly.The radius,length,and distance of the lines can influence the induced voltage on the load.These results can help us to put forward the effective protective measures against the electromagnetic pulse.
引文
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