Transactions on Machine Design Margreta Vasileva, Neli Velikova, and Danail Stanchev 10 1 2022 https://www.dline.info/tmd/fulltext/v10n1/tmdv10n1_2.pdf We studied the variations of the metal-oxide surges during many environments in this work. We studied the model of the influence of the lighting strokes that occur during the electric distribution lines. The distribution lines of the electrical equipment of the substation are examined during the process.