A simplified calculation method for dynamic windage yaw of an iced conductor

Abstract

The invention discloses a simplified calculation method for dynamic windage yaw of an iced conductor. The simplified calculation method comprises the following steps: solving an equivalent static windload of the iced conductor based on a gust load envelope line method (GLE); instroducing A height difference correction coefficient, so that the problem that a rigid straight rod method is inaccuratein gravity load estimation when the height difference of a line hanging point is large is solved; Taking the circular-section ice-coated wire as an example, carrying out verification and parametric analysis on the effectiveness of the simplified calculation method by adopting a time domain method to obtain a change rule of the windage yaw angle of the ice-coated wire along with wind speed, ice coating density and ice coating thickness. According to the calculation method, the pulsation effect of the wind load can be accurately considered, excessive calculated amount cannot be increased, calculation errors of the gravity load of the wire caused by large height difference of line hanging points are avoided, and the calculation method is suitable for batch analysis of multiple parameters such as the icing shape, density, thickness and aerodynamic coefficient of the wire.

Description

technical field [0001] The invention belongs to the field of dynamic calculation of conductors of transmission lines, in particular relates to the dynamic calculation of conductors under the condition of ice-wind coupling, and proposes a simplified calculation method for dynamic wind deflection of ice-coated conductors. Background technique [0002] Our country is one of the most serious areas in the world where power transmission lines suffer from freezing disasters. After the wire is covered with ice, on the one hand, the gravity will increase, and on the other hand, the windward area and the wind load will also increase accordingly. It is difficult to directly judge the impact of ice coating on the wind deflection angle of the insulator string. In addition, according to meteorological data, the frequency of severe ice and wind conditions is increasing, and the possibility of transmission conductors encountering icing and strong wind coupling increases accordingly. It is n...

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Problems solved by technology

[0006] A simplified calculation method for the dynamic wind deflection of ice-coated conductors, based on the gust load envelope method (GLE) to solve the equivalent static wind load of ice-coated conductors; The problem of inaccurate estimation of gravity load when the point height difference is large; taking the circular cross-section ice-covered conductor as an example, the validity of the simplified calculation method was verified by using the time domain method, and the parametric analysis was carried out, and the covered Variation law of wind deflection angle of ice conductor with wind speed, ice density and ice thickness

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