A Simulation Study of Conductor Swing under Pulsating Wind of UHV Transmission Lines and its Suppression

Transmission lines are susceptible to the wind and it may cause conductor swing during their operation. UHV compact transmission lines are easily affected by conductor swing which could lead to interphase flashover due to their small inter-phase clearance. According to the current research, it is widely believed that the wind load on the transmission lines contains significant pulsating effects. Therefore, it is necessary to study the motion characteristics of the transmission lines under the action of pulsating wind. To analyze the dynamic behavior of the transmission lines, a three degrees of freedom (3DOF) nonlinear mechanical software was developed in this paper. The simulated results showed that compared with the steady wind, the minimum inter-phase clearance that can occur under pulsating wind was smaller, and the maximum unbalanced tension were greater. It was found that the minimum inter-phase clearance of the iced conductor decreased with the increase of the span length. In addition, it was also found that the reasonable installation of interphase spacers could play a positive role in suppressing the conductor swing of the iced conductor under the action of pulsating wind.