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Simplified Evaluation of Damage Probability of Apparatus Powered by an HV/LV Transformer Due to Lightning Strokes to the Overhead Line

In this paper a simplified approach is proposed to evaluate the probability of failure of equipment powered by an HV/LV transformer due to lightning strokes to the overhead HV line. Some considerations are made even on the probability of damage of the HV/LV transformer and on the influence of the withstand voltage of its primary winding on the probability of damage of the LV equipment.