Research on HEMP response of ground laid cables

The characteristics of current induced by HEMP on cable’s shielding layer has been researched by multiresolution analysis in time domain. There are several factors, including height from cable to ground, length of cable and direction of incident HEMP, having effect on the current. The relationship between the induced current and the factors is analyzed. The analysis shows that, the higher the height from cable to ground is, the bigger the amplitude of the induced current is. It also indicates that, the amplitude, rising time and FWHM of the induced current are increasing while the length of the cable is getting longer until they all reach their own maxima. The distribution of the induced current along the cable with normal HEMP incidence is different from that with oblique incidence, and