Abstract
It has been established that the reference power limits and corresponding maximum lengths for 35-750 kV overhead power lines do not comply with the requirements of the current Ukrainian Electrical Installation Code. The use of such reference data results in significantly high process losses of electrical energy during its transmission and distribution. The current Electrical Installation Code standardize the current density in aluminum and steel-aluminum conductors at 0.8 A/mm². A target function was obtained for the dependence of the overhead line efficiency on its operating and struc-tural parameters. This target function allowed us to determine the maximum lengths for economically justified power of 35-750 kV overhead lines with an efficiency of 0.98 p.u. and a current density standardized by the Electrical Installa-tion Code. This expression allows for the economic justification of annual technological losses of electric power in overhead lines of distribution and transmission system operators by selecting the appropriate cross-sections of conduc-tors when developing long-term plans for the development of electrical networks. Ref. 12, fig. 2, table.