Modeling method of finite element model for overhead power transmission tower-line coupling system

Abstract

The invention discloses a modeling method of a finite element model for an overhead power transmission tower-line coupling system and belongs to the technical field of ice resistance assessment for an overhead power transmission line. The modeling method comprises the following steps: utilizing a computer to firstly establish a finite element model library of the overhead power transmission tower, a guide line and a ground wire through a program, then building a finite element model basic structure of the power transmission tower-line coupling system, and using a geometric nonlinear finite element form finding analytic method to build an accurate finite element model of the overhead power transmission tower-line coupling system under the self-gravity action, so as to realize quick and efficient establishment of the finite element model for the overhead power transmission tower-line coupling system. The method has the advantages of simplicity, strong operability, less modeling workload, high efficiency, accuracy, reality and reliability in the model, high precision, strong applicability and the like. The modeling method can be widely applied to establishment of the finite element model for the overhead power transmission tower-line coupling system, in particular to establishment of the large-area multi-line overhead power transmission tower-line coupling system, and provides accurate and reliable basis for assessment of the ice resistance.

Description

technical field [0001] The invention belongs to the technical field of evaluating ice resistance capability of overhead transmission lines, and in particular relates to a modeling method for a finite element model of a tower-line coupling system of overhead transmission lines. Background technique [0002] The overhead transmission lines of the power system are exposed to nature for a long time and are easily affected by natural disasters such as icing. The icing hazards of overhead transmission lines in our country are relatively serious, and large-scale icing disasters and accidents occur from time to time, which have caused huge disasters and losses to the national economy and people's lives. With the rapid development of my country's economic construction and the improvement of people's living standards, preventing the occurrence of icing disasters on overhead transmission lines and ensuring the safe and stable operation of power systems have become urgent problems to be...

AI Technical Summary

Problems solved by technology

The main disadvantages of this modeling method are: ① When establishing the finite element model of the tower, it is necessary to establish a 3D CAD model and import it into ANSYS, manually simplify and extract the frame feature structure and change the working plane, resulting in slow modeling and time-consuming ② The influence of the insulator string on the overhead transmission tower-line coupling system is not considered, and the simplified tower model is established instead of the actual cross-sectional shape, so the accuracy of the modeling is low; ③ The established conductor and ground wire The finite element model has not been subjected to form-finding analysis of the initial shape, resulting in differences between the established finite element model of the tower line tower and the actual model, and the reliability and accuracy of the model are low, which leads to the use of this model for force analysis and ice resistance assessment The results obtained are inaccurate; ④ When building a tower model, it is necessary to manually simplify and extract the frame feature structure, and the interface between CAD and ANSYS software is required; the finite element model library of the feature structure is established with BEAM188 beam elements, and each frame structure is established It is necessary to call the model library of the corresponding feature structure; at the same time, it is necessary to change the working plane, gradually transition from one-sided to multi-sided, and gradually "splicing" the single-sided structure to form a multi-sided structure, which makes the modeling method more complicated and technically difficult. The operability is low and the applicability is poor, so it is not suitable to use the model established by this method to evaluate the anti-icing ability of multiple overhead transmission lines in a large area

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