导体表面雷电流测量

Measurement of lightning current on conductor surface

为了对雷电流在导体表面的分布情况进行研究,研制了线圈式表面电流探头和巨磁阻表面电流测量系统,设计制作了低压脉冲源,在TEM传输室中对2种测量系统进行了实验和标定。采用这2种测量系统对矩形铝板表面电流密度进行了测量和仿真计算,实测和仿真计算结果一致。结果表明,巨磁阻表面电流测量系统可用于研究雷电流在导体表面的分布;采用合适频率的连续波,线圈式表面电流探头用于替代雷电流密度分布测量也是可行的。

To measure the distribution of lightning current on the conductor surface,coil surface current probe and GMR（giant magneto registive） surface current measurement system were developed,a 1.2/50μs low voltage pulse source designed,and the two systems calibrated and tested in the TEM chamber.The measuring results,obtained by surface current density measutement experiment on the rectangular AIplate,are consistent with that got through numerical simulation.It shows that GMR surface current measurement system can be used to study the lightning current distribution on the conductor surface; and that coil surface current probe is useful too when measuring continuous wave with appropriate frequency.