Straight-line tower stress risk assessment method

Abstract

The invention provides a method for evaluating the stress risk of a linear tower, which comprises the following steps of: modeling a linear tower of a transmission line by a finite element mechanicalmodeling to obtain a three-dimensional geometric model of a tower-line coupling system; calculation steps: calculating various external loads of the straight-line tower under different icing thicknesses and different wind speeds; a simulation step: based on the three-dimensional geometric model of the tower-line coupling system, the simulation results are obtained by applying the various externalloads to the tower-line coupling system; an evaluation step of obtaining an evaluation result of a stress risk according to the plurality of simulation results. The invention can judge the risk degreeof the straight-line tower when icing, thereby obtaining the mechanical characteristics of the straight-line tower under the action of the external load when the icing disaster occurs, providing important reference value for the electric power operation department when melting ice, and solving the problem that the score analysis process is difficult in the prior art.

Description

technical field [0001] The invention relates to the technical field of finite element analysis of straight towers, in particular to a method for evaluating stress risks of straight towers. Background technique [0002] Transmission towers are an important part of overhead transmission lines. With the rapid development of power grid construction, the safety requirements for transmission towers are getting higher and higher. In recent years, the occurrence of extreme weather has increased, and large-scale icing incidents on transmission lines have occurred frequently, resulting in accidents such as transmission line disconnection, conductor galloping, tower collapse, and insulator flashover, resulting in huge economic and property losses. [0003] So far, it is difficult to use the score analysis process for the transmission tower-line coupling system under the combined action of various uniform icing and wind speeds. Contents of the invention [0004] In view of this, the ...

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a method for assessing the stress risk of a linear tower, judging the risk degree of a linear tower when it is covered with ice from three main features, and then obtaining the external load of the linear tower when an icing disaster occurs. The mechanical characteristics under the action provide important reference value for the power operation department when to adopt ice melting, and solve the difficult problem of using the score analysis process in the prior art

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