Modelling and analysis of different representations for high voltage tower structures

To evaluate the transient stress in the high voltage transmission system, numerical transient simulation programs are used. Transient stress is caused by lightning discharges, switching operations, faults etc. and may influence the operation of high voltage equipment. For the analysis and evaluation of flashovers, suitable numerical simulation models for high voltage tower structures are required. Also the modelling of arcing horns and the frequency dependent footing resistance are very important parts, which have to be considered. In case of lightning discharges to ground wire and the phase conductors, it is necessary to evaluate if a shielding failure can occur. To focus of this paper is to evaluate the probability of lightning strikes and the number of lightning strikes to overhead lines with the use of the electro-geometrical model.