Reliability Analysis and Safety Improvement Measures Research of Transmission Line Tower-Line Structure under Ice-Wind Conditions

Abstract

The tower-line structure system of transmission line is a whole composed of tower structure, insulator, fittings and grounding wire and other components or subsystems. Its reliable operation is of great significance to the safe and stable operation of power system. In this paper, the reliability analysis method of transmission line tower-line structure system under the combination of ice and wind is modeled. Firstly, the reliability index of pole-tower structure, insulator, fittings and grounding wire is calculated by checking point method of first-order second-moment method. Then, the reliability calculation method of series structure system is used to calculate pole-tower structure, insulator, fittings and grounding wire. Finally, taking a straight tower and tension tower as examples, the system reliability indices of pole-tower structure, insulator, fittings and ground wire under ice-wind combination are calculated and analyzed, which can provide reference and guidance for disaster prevention of transmission lines.