PROJECT TITLE :

Influence of the Ground Potential Rise on the Residual Voltage of Low-Voltage Surge Protective Devices due to Nearby Lightning Flashes

ABSTRACT:

The characteristics of the residual voltage of a surge protective device (SPD) connected to an overhead distribution line due to nearby natural cloud-to-ground lightning and to rocket-triggered lightning are analyzed during this paper. The residual voltage of the SPD is found to be closely related to the bottom potential rise at the grounding terminal of the SPD. For natural lightning occurring 1.8 km to 10.five km aloof from the SPD, the bottom potential rise (GPR) is just too small to influence the residual voltage of SPD. For rocket-triggered lightning with a 40-m distance between the lightning channel and therefore the SPD, the residual voltage of SPD is primarily determined by the voltage induced in the distribution line for come stroke and large M-parts method, whereas the influence of the GPR becomes sturdy within the minor M-parts stage. For a five-m distance between the lightning channel and the SPD, the residual voltage of SPD originates primarily from the GPR throughout the entire flash, exhibiting the characteristics of reversed polarity. The duration of SPD's residual voltage could be up to the order of milliseconds because of the GPR within the case of the large M-parts and a protracted continuing current method, which may cause injury to the SPD.


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