Analysis of interphase discharge faults on transmission lines under the action of upwind on the windward slope

There is a general upward wind on the windward slope of mountains. Under the action of this vertical upward airflow, the vertical and lateral wind deflections of the conductor and ground wire will increase significantly. The current specifications in China do not consider the vertical wind speed component in the upward wind on the windward slope, which may lead to significant calculation deviations in the wind deflection displacement of conductor and the ground wire. Taking the example of the interphase discharge of the conductor and ground wire in a microtopography area in Xinjiang, with the help of fluid dynamics simulation, the upward wind speed component at the windward slope is obtained, and the wind deflection response analysis of the ground wire considering the influence of the vertical wind speed component is carried out. The analysis shows that as the wind speed increases, the vertical and lateral distances of the ground wire are continuously decreasing, and the decrease in vertical distance is more significant. Eventually, when the wind speed reaches a certain magnitude, the interphase distance of the conductor and ground wire is less than the discharge gap limit, which induces the interphase discharge of the ground wire.