Nonlinear Wind-Induced Response Analysis of Substation Down-Conductor System

Abstract

Substation down conductor structure system is generally bundled conductor, and has the characteristics of small span, large height difference, short length and upper and lower connection. Substation lead-down accidents caused by strong wind often occurs. Down conductor accidents of substation caused by strong wind often occur. In order to study the nonlinear wind-induced response of the conductor under wind load, the AR model method is used to simulate the fluctuating wind load, and the modal analysis and nonlinear time history analysis of the wind-induced response of the flexible conductor system are carried out by using ANSYS software. The effects of aerodynamic damping, wind direction and Span-to-height ratio on wind-induced vibration response are studied. The analysis results show that the response of down conductor system has obvious non-Gaussian characteristics; Compared with the conventional horizontal long-span transmission lines, the natural frequency of down conductor is higher, the influence of aerodynamic damping is smaller, and the response wind-induced vibration coefficient is larger. The wind load in plane will lead to larger reaction response, and the wind load out of plane will lead to larger displacement response. The increase of Span-to-height ratio will lead to the increase of reaction response and the decrease of displacement response of the structure.