摘要
采用时域有限差分法计算得出地闪回击电流近场在地面附近的分布,将场值代入离散化后的传输线方程后,计算了近地电缆外导体上的感应电流,分析了大地电参数、导线架高、长度以及与雷击通道距离等因素对感应电流的影响。计算结果显示,距雷击通道200m以内的近场对敏感设备及系统构成的威胁最为严重,应作为地闪电磁脉冲环境预测研究的重点。
The finite-difference time-domain （FDTD） method is used to obtain the field value near a cloud-to-ground lightning current, then the field value is put into the discretized transmission line equation to calculate the induced current in the outer conductor of a cable put on the ground. The influence of conductivity of the earth, height of the cable and length of the cable as well as the distance to the lightning return channel on the induced current is discussed. The results reveal that near fields in a range of 200 m constitute the most severe threat to sensitive facilities and systems, which should be highlighted in the study of LEMP environmental forecasting.
出处
《电波科学学报》
EI
CSCD
北大核心
2006年第5期750-755,共6页
Chinese Journal of Radio Science
基金
国家自然科学基金资助重点项目(50237040)
国家自然科学基金资助项目(60471013)
关键词
地闪电磁脉冲
耦合
时域有限差分
lightning electromagnetic pulse （LEMP）, coupling, FDTD
