Underground Three-Phase Power Transmission Line

Purpose: To consider a design and technological solution for reactive power compensation in a cable line. Firstly, to reduce power losses and, secondly, to increase the reliability of the power supply system. Methods: The method of analytical review of the advantages and disadvantages of underground cable transmission lines was employed; the calculation and analytical research was carried out using the theory of long lines. Results: The calculations for the three-phase power supply system parameters were conducted at varying interphase distances. The calculation results have demonstrated the capacitive nature of the input resistance complex in the idle mode and the dependence of the cable line capacitance on the interphase distance. Practical significance: The research results emphasize the advantages of using underground three-phase power transmission lines and justify the application of the proposed design.