Galloping behavior of insulated overhead transmission line based on aerodynamic analysis

The galloping of iced transmission line under extreme weather conditions, will lead to significant electrical faults and structural damage, and is becoming a serious issue that threatens the safe and stable operation of the power grid. In this paper, a simulation model of 10 kV insulated overhead transmission line is established based on finite element method, and the effects of various influencing factors on the galloping behavior and aerodynamic characteristics are investigated and analyzed. The results show that the aerodynamic stability of the iced lines is poorest, when the wind speed is between 7 and 15 m/s and the wind attack angle is around 50°. As the wind speed increases, the maximum galloping displacement for iced lines exhibits a nonlinear increasing trend. The inflection point wind speed for the elliptical iced line is 5 m/s, while that for the crescent-shaped iced line is 9 m/s. Compared with the elliptical iced lines, the crescent-shaped iced lines gallop more violently with the maximum displacement of 1.7 m. These findings could provide theoretical references for fault analysis and galloping prediction of overhead insulated transmission lines.