超宽带高功率脉冲对裸导线的耦合特性分析

Analysis of Coupling Characteristics of Exposed Cable Irradiatedby Ultra-Wide Band High Power Pulse

针对裸露导线面临的电磁干扰问题,基于时域有限差分法(finite-difference time-domain,FDTD),利用CST模拟仿真了超宽带高功率脉冲(ultra-wide band high power pulse,UWBHPP)对裸露导线的耦合响应特性。首先,基于FDTD算法,对沿水平方向铺设的裸露导线进行建模;其次,计算了不同超宽带高功率脉冲垂直辐照离地10 cm的裸露导线时,不同长度裸露导线耦合信号的结果;最后,分别分析了裸露线缆耦合电压峰值及耦合电压上升沿与线缆长度的关系。仿真结果表明:裸露导线的耦合电压峰值先随线缆长度的增加而增加,最终趋于稳定;耦合电压的上升沿随线缆长度的增加也会趋于稳定;相近脉冲宽度、不同上升沿的UWBHPP信号对耦合信号影响较小,相近上升沿、不同脉冲宽度的UWBHPP信号对耦合信号影响较大。仿真结果可为线缆的电磁防护设计提供了参考。

In this paper,the coupling response characteristics of ultra-wideband high power pulse(UWBHPP)to exposed cable are analyzed by using CST simulation based on finite difference time domain(FDTD)method.Firstly,based on FDTD algorithm,the exposed cable laid along the horizontal direction is modeled.Then,the cable coupling signal results under different UWBHPP signals and different cable lengths are calculated when the UWBHPP vertically irradiates exposed the cables 10 cm above the ground.Finally,the relationships between the peak value of cable coupling voltage and the rising time of coupling voltage with cable length are analyzed,respectively.The simulation results show that the peak coupling voltage of the exposed wire first increases with the increase of cable length,and finally the coupling voltage of exposed wire tends to be stable.Also,the rising time of coupling voltage signal tends to be stable with the increase of cable length.The UWBHPP with similar pulse widths and different rising time have little impact on the coupling signal,while the UWBHPP with similar rising time and different pulse widths have a greater impact on the coupling signal.The simulation results provide a reference for the electromagnetic protection design of cables.