Influence of Insulation on Thermal Behavior of Overhead Line Conductors

Abstract

To provide the accurate thermal rating of overhead power lines is required to consider the conductor temperature depending on a variety of weather factors. New types of conductors, such as overhead insulation-covered conductors are widely used in electrical networks. Wellknown IEEE 738 and CIGRE standards calculate the bare overhead conductors only and are not applicable for thermal rating of overhead insulation-covered conductors. Numerical methods are able to calculate the insulated conductors, but have many drawbacks, such as the difficulty of modeling and low computation speed. The authors propose an analytical mathematical model to determine the thermal rating both overhead insulation-covered and bare conductors. Results of temperature calculation and active power losses calculation for overhead insulation-covered and bare conductors with the same cross section at selected weather conditions and changes in load current have been presented. Neglect of insulation can lead to errors in calculating of temperature up to 30%.  Index Terms-insulation-covered conductors; bare conductors; overhead lines; conductor temperature; thermal rating; active power losses; weather conditions Vladimir N. Goryunov received the D.Sc. degree in electrical engineering from Moscow Power Engineering Institute, Moscow, Russia in 1992. Currently, he is a Professor and Head of

Influence degree of skin-effect for overhead line conductors

“…Worse, the specialized papers [4][5][6] use same formulas even in irrelevant cases. Many papers just ignore the skin effect phenomenon [7][8][9][10][11].We can see this case because the analytical methods for the skin effect calculation have the high computational complexity. For example, the case of the solid cylindrical conductor requires the calculation of the Bessel function with a complex argument [1][2][3].…”