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Lightning interception is investigated through scale model experiments. By regarding the rod-plane gap under lightning impulses as a reference case, results are presented relating to the discharge interception probability of an earthed rod inserted in the gap; the impulse voltage polarity, the length of the reference gap and the earthed rod height were considered as influencing parameters. Proximity effects of a neighbouring object on the interception probability distribution of an air terminal are also investigated by inserting two earthed rods in the reference rod-plane gap. Experimental results are interpreted in terms of the breakdown mechanism and electric field computations. A new lightning attachment model, statistical model, is introduced. Thus, statistical methods for the estimation of lightning incidence to air terminals, shielding design of common structures and for the evaluation of the lightning performance of overhead transmission lines are proposed. Results are compared ...
Lightning interception is investigated through scale model experiments. By regarding the rod-plane gap under lightning impulses as a reference case, results are presented relating to the discharge interception probability of an earthed rod inserted in the gap; the impulse voltage polarity, the length of the reference gap and the earthed rod height were considered as influencing parameters. Proximity effects of a neighbouring object on the interception probability distribution of an air terminal are also investigated by inserting two earthed rods in the reference rod-plane gap. Experimental results are interpreted in terms of the breakdown mechanism and electric field computations. A new lightning attachment model, statistical model, is introduced. Thus, statistical methods for the estimation of lightning incidence to air terminals, shielding design of common structures and for the evaluation of the lightning performance of overhead transmission lines are proposed. Results are compared with that obtained from other lightning attachment models from literature; the statistical model yields results in satisfactory agreement with field data reported in literature
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