核电磁脉冲环境中传输线的电磁干扰

Eletromagnetic Interference of Transmisssion Line in HEMP Environment

高空核电磁脉冲环境将在传输线上产生电磁干扰,会威胁与之相连的电子设备的安全。为了在理论上对传输导线在核电磁脉冲环境下的响应电流进行分析从而得到电流的响应规律,采用传输线计算模型,在电磁脉冲环境为正入射,地面为有耗介质时,计算了地面附近平行铺设的导线在两端短路、两端接高阻、一端接地一端接电阻、两端接不同电阻等4种状态下的电流响应;并研究了感应电流的幅值、上升沿、半高宽以及电阻上电压降等参数在导线长度增加时的变化情况,结果表明这些参数随传输线长度的变化均有最大值,而且电流幅值随传输线离地高度降低趋于减小。

The high-altitude nuclear electromagnetic pulse would generate electromagnetic interference on transmission line, which would threaten the safe operation of electronic devices connected with this transmission line. Therefore, the current responses on transmission line in HEMP environment were theoretically analyzed, and the current responses law was gotten. When the electromagnetic environment pulse incidence was at normal angle and the ground was lose medium, the calculation method was adopted with the transmission line theory. The current responses on lines laying near ground were calculated according to the following four different situations： two terminals in short-circuit, two terminals connected with high resistances, one terminal in short-circuit and one terminal linked with resistance, two terminals connected with different resistances, respectively. And the variation of current amplitude, rise time, width time of half wave and voltage on resistance was analyzed when the line length increased. The result shows that all these parameters have their maximum values, and the current amplitude reduces as the height of transmission line above the ground decreases.