This thesis presents an analysis of the mechanical calculation of a medium-voltage power line with a semi-insulated conductor. The focus was on the application of semi-insulated conductors in demanding conditions such as wooded areas, proximity to populated areas, and extreme locations characterized by strong winds, ice, and heavy rainfall. The calculation revealed variations in stresses, horizontal forces, and sagging due to temperature fluctuations and loading conditions. A comparison with non-insulated conductors showed slightly higher sagging in semi- insulated conductors due to the added weight of insulation. The study also examined the elements used for connecting the conductors to ensure stability and safety against factors like aeolian vibrations and ice-related issues, temperature effects, and snow. The comparison of two methods for mechanical calculation highlighted the superiority of the AutoCAD Electra program, which offered faster performance, a greater number of options, and improved project visualization. These advantages enable engineers to efficiently design power lines, taking into account all relevant parameters. This research contributes to the understanding of the mechanical calculation of medium-voltage power lines with semi-insulated conductors and their application in specific conditions. Furthermore, it suggests further exploration for optimizing power line designs, exploring alternative conductor types, and analyzing the impact of different parameters on power line performance. Overall, this thesis serves as a foundation for further development and improvement of the mechanical calculation approach for medium-voltage power lines, facilitating the creation of more efficient and secure electrical networks in demanding conditions.