Vol.1, No 4, 1997 pp. 1 - 6
UDC: 533.9+621.316.98
THE INFLUENCE OF THE CONDUCTIVE RING ON THE EFFECTIVE HEIGHT OF THE LIGHTNING ROD
Aleksandar Vorgučić
Faculty of Electronic Engineering, University of Niš, Yugoslavia, tel +381 18 46 466, ext.644, Fax: +381 18 46 180
e-mail: vorgucic@europa.elfak.ni.ac.yu
Abstract. In this paper the experimental results of the exemination,on the model, the influence of the concentric, conductive circle ring position on the effective height of the vertical lightning rod are given. The effective height is determinated in relation to the vertical lightning rod without the ring. The height of the ring is changeable and was, in experiment, changed from zero to the height of the top the lightning rod. The investigation is performed for a normal discharge case with the negative downward leader and also for a reversed case, the positive discharge coming from the cloud. The results of the experiment pointed out on negative influence of the ring, namely on decreasing of the effective height, and that was expected.

" Experiment is materialized doubt"
 (S. Djulbabic)

Acknowledgment. The author wish to thank prof.dr Djordje Bošan, who gave him a possibility and helped him in experimental research in Electronic faculty Laboratory for gas discharges.

Paper was presented on the Fourth international symposium of applied electrostatics (PES'96), Niš,22-24 May, 1996
UTICAJ PROVODNOG PRSTENA NA EFEKTIVNU VISINU GROMOBRANA
U radu su dati eksperimentalni rezultati istraživanja, na modelu, uticaja visine postavljanja koncentričnog provodnog kružnog prstena na efektivnu visinu gromobrana. Efektivna visina je određivana u odnosu na visinu gromobranske hvataljke bez prstena. Visina prstena je promenljiva i menjana je od nule do visine vrha gromobranske hvataljke. Istraživanja su vršena za uglavnom normalna pražnjenja sa negativnim silaznim liderom kao i za obrnut slučaj pozitivnog dolazećeg pražnjenja iz oblaka. Rezultati eksperimenta ukazuju na negativan uticaj prstena tj. na smanjenje efektivne visine, što se i očekivalo.