Features of designing high-voltage overhead power lines in an underground collector

• Date: 2025
• Main Authors: Shevchenko, S. Yu., Danylchenko, D. O., Hanus, R. O., Dryvetskyi, S. I., Berezka, S. K., Grechko, O. M.
• Format: Article
• Language: English; Ukrainian
• Published: National Technical University "Kharkiv Polytechnic Institute" and Аnatolii Pidhornyi Institute of Power Machines and Systems of NAS of Ukraine 2025
• Subjects: compact high-voltage overhead power line; underground collector; busbar conductor; thermal modeling
• Online Access: http://eie.khpi.edu.ua/article/view/338016
• Journal Title: Electrical Engineering & Electromechanics

Problem. Protection of HV overhead power lines (OPL) from external atmospheric and military influences and reduction of their hazardous electromagnetic radiation is possible if they are made in a compact form and placed in an underground collector. But to ensure high capacity and reliable operation of such compact HV OPL, it is necessary to improve the existing designs of their current-carrying elements. The goal of the work is to determine promising design parameters of busbars of compact high-voltage overhead power lines laid in an underground collector. The methodology for calculating permissible long-term currents of HV OPL laid in an underground collector is based on the analytical model proposed by the authors for describing the processes of mass and heat transfer in the air of an underground collector. Scientific novelty. For the first time, the possibility of efficient use of HV OPL in an underground collector conditions is substantiated and the conditions for their reliable transmission of electric energy with increased capacity are determined. This is achieved through the use of rectangular flat vertical conductive busbars with an increased surface area and providing better convective heat exchange compared to traditional round wire, as well as by determining the rated current for such overhead lines at a reduced ambient temperature (15 °C), which is typical for operating conditions in underground collectors (25 °C) adopted for overhead lines located outdoors. Practical value. The use of the proposed HV OPL laid in an underground collector should ensure reliable transmission of electrical energy, sufficient throughput and increased protection from external factors while reducing the electromagnetic impact on the environment (due to a significant reduction in the interphase distance from 3–4 m to 0.3–0.6 m for 110 kV HV OPL), and has advantages over SF6-insulated cable lines and cable lines characterized by an increased insulation cost). References 36, table 1, figures 6.