Thermal calculation of covered conductor for overhead lines

The subject under study is urgent because of a wide use of covered conductors for constructing and reconstructing overhead high-voltage lines. The aim of the research is the analysis of thermal mode of covered conductors under different weather conditions: air temperature, wind speed and direction, as well as solar heating. The research uses the analytical method solving the equation of the thermal balance of covered wires. The paper provides the procedure for calculation of temperature and continuous allowable current for covered wires in overhead high-voltage lines taking into account different weather conditions and based on the thermal balance equation. The research outcome may be applied at designing, constructing and reconstructing overhead high-voltage lines of covered wires.