Currents and charge absorbed by low-voltage SPDs in overhead distribution systems due to lightning

This paper presents an evaluation of surges in LV overhead distribution lines caused by direct lightning strikes to medium voltage lines. The study was performed using the ATP (Alternative Transients Program). Currents and charges absorbed by surge protection devices (SPDs) placed on the LV system are the quantities of interest. The main components of the distribution system are included: lines; insulators; transformer; loads; and ground resistances. Parameters having a major effect on the phenomenon, such as the lightning current amplitude and front time, the values of the grounding resistances and the lightning strike position were taken into consideration