Simulation Study on Wind Load and Mechanical Characteristics of High Voltage Dis-Connector

Abstract

The high-voltage dis-connector, as a key substation equipment in the power grid structure, is vitally important to the quality of the power grid operation. Due to the geographic location of Guangdong Province of China, many strong typhoons have caused great damage to power facilities in recent years. And the loss of the dis-connector is the most serious, which severely affects the reliability of the power supply. However, the research on the wind resistance of the dis-connector is still few, so the improvement work of the device is quite difficult. The phenomenon of strong typhoon destroying the dis-connector mainly includes the fracture of post insulator and the conductive arm. In the study of the mechanical properties of post insulator and the conductive arm, almost all wind loads are treated as a concentrated force, but the surfaces of the post insulator and the conductive arm are actually subjected to a continuous wind pressure distribution. The magnitude of the wind load and the error of its application method will inevitably lead to inaccurate stress and strain data obtained in the calculation of the strength of the post insulator and the conductive arm, so that the post insulator and the conductive arm cannot be accurately designed. In this paper, the wind resistance of the dis-connector are studied by using the fluid-structural coupling analysis method. Firstly, the hydrodynamic RNG k-ε turbulence model is used to simulate the wind field around the dis-connector, so as to obtain the accurate result of the wind pressure distribution on the surface of the dis-connector. Then the surface pressure of the dis-connector calculated by hydrodynamics simulation is introduced into the structural module of Ansys software as the applied load. The finite element method is used to simulate and calculate the stress and strain of the dis-connector, so as to obtain the mechanical characteristics of the dis-connector under strong wind. In addition, this paper analyzes the effects of different wind speeds and different wind directions on the wind load applied to the surface of dis-connector, and provide a basis for wind resistance design of dis-connector.