Research On Windage Yaw Characteristics Of Transmission Line Based On Coupling Model Of Insulator-Conductor

In recent years, due to the rapid growth in electricity load, the higher and higher voltage level of transmission line, and the large spanning development in line corridor, the material of wire and insulator have been lighter. Thereby, it inevitably results in the stronger sensitivity of transmission line to the wind and the windage yaw of the overhead transmission lines is increasingly significant. The windage yaw flashover is once occurred, which will lead to a trip line, power loss and even wire breakage and other accidents. So the operation security of the power grid and reliability of power supply system will be seriously affected. Therefore, the study on characteristics of the windage yaw in transmission lines is extremely important for the prevention of accidents and the management of the phenomenon on windage yaw. In this paper, according to 500 kv compact transmission line, the wind field simulation, wire shape coefficient and windage yaw influence factors is studied. The main contents are as follows:1.The simulation of wind field in transmission lines. In the paper, The harmonic synthesis method to simulate the process of fluctuating wind speed is deduced. Using FFT algorithm to speed up the calculation speed, the fluctuating wind speed under different span has been gotten. And according to the laws of wind, the expression of the wind speed of gust is listed.2.The research of conductor shape coefficient. Using Gambit software, the physical model of four-split、six-split、eight-split conductor was established. And the bundled conductor was simulated by using fluid analysis software named Fluent separately. Therefore, the aerodynamic characteristics of a split conductor under average wind speed was obtained as well as the shape coefficient of the wire.3.The impact study of asynchronous swing wires and windage yaw of hanging strings under different factors. The finite element coupling model of insulator-conductor is established by using ANAYS. The transient dynamic analysis is conducted in the average wind, gusts and fluctuating wind field. So the maximum windage yaw displacement of insulator and conductor under different wind models, spans and quantity of spans were obtained. And on this basis, this paper judged the possibility of the windage yaw flashover that electric transmission line will have.