Observation of the lightning_induced voltage in the horizontal conductor and its simulation

Abstract

Characteristics of induced voltage in a horizontal conductor due to a natural lightning with 9 dart leader/return stroke sequence were analyzed. Effect of various parameters on the induced voltage was examined by numerical simulation. The induced voltage varied from a minimum of 4.6 kV to a maximum of 18.6 kV with a geometric mean of 11.2 kV. The geometric mean of the half-peak width and the down time of the induced voltage was 0.87 and 2.9 μs, respectively. The simulated results showed that the induced voltage on both ends of the horizontal conductor would increase with increasing return stroke velocity and also increase with increasing height of the horizontal conductor. The voltage would also increase with increasing of the matched grounding impedances on both ends of the horizontal conductor but the relationship was nonlinear. The induced voltage at the higher impedance end was much larger than that at the lower impedance one provided that the impedances at both ends were not matched, which indicates that good grounding can decrease effectively the induced voltage along the conductor.

Indirect lightning performance of 10-kV overhead distribution lines

“…The polarity of the lightning-induced voltage pulse changed on the side close to the observation point 1, resulting in different pulse polarities at both ends of the wires; this is consistent with the observation results (Barker et al, 1996;Michishita et al, 2003;Yang et al, 2003). As reported in the literature (Yang et al, 2003), the charges with opposite polarities accumulated at both ends of the wires, resulting in opposite potentials at the two ends of the wires.…”

“…The aforementioned phenomena can be represented using the Agrawal coupling model. The lightning-induced voltage of a conductor is determined by E x and E Z , which are the excitation sources of V s and V i , and the intensity of E x is higher than that of E Z (Michishita et al, 2003;Yang et al, 2003). The intensity of E Z was the highest at N, but the effective value of E x varied with the angle between the electric field propagation direction and the conductor (Yu et al, 2019;Yu et al, 2020).…”