The paper describes the problem of determining (estimation) the number of direct lightning strikes in high-voltage power lines, based on the application of electrogeometric models (EGM) of lightning strike development. The problem of determining the number of lightning strikes in the phase conductor in power lines with one or two protective wires (the so-called SFR value) and the problem of determining the resulting number of flashovers due to direct lightning strikes in the phase conductor (the so-called SFFOR value) were also analyzed. Based on the appropriate mathematical models, computer programs were developed in the MATLAB programming environment and a comparative analysis of several different EGM models was made (Wagner, Young, Love, Armstrong & Whitehead, Eriksson, etc.).