Calculation and analysis of overhead transmission line capacity

Power transport is the most important component of an electric power system. Modernization and optimization of its operation, increase in capacity, as well as variation in connection circuitry with maintained or improved reliability is a crucial objective for the whole energy industry. The paper is about creating a circuit-technical solution for a dual-circuit three-phase power transmission line whereby we define a new operating mode “with a split backup phase”. We herein describe conventional and non-conventional types of AC transmission such as overhead transmission lines, six-phase power lines, and flexible alternating current transmission systems (FACTS). We further analyze ways to improve the efficiency of overhead power transmission lines using structural and functional redundancy. A circuit-technical solution for a dual-circuit power transmission line with expanded operating modes is considered in detail. Possible operating modes of dual-circuit power lines are described. We also consider ways to increase the natural capacity of such lines. We have calculated the capacity of split backup phase lines and present the results of our calculations herein along with an analysis of such capacity in comparison to that of conventional transmission lines.