Research on equivalent bending stiffness of overhead transmission lines

Xifeng Lv; Dong Qi

doi:10.1117/12.2682895

16 June 2023 Research on equivalent bending stiffness of overhead transmission lines

Xifeng Lv, Dong Qi

Proceedings Volume 12703, Sixth International Conference on Intelligent Computing, Communication, and Devices (ICCD 2023); 127032Q (2023) https://doi.org/10.1117/12.2682895
Event: Sixth International Conference on Intelligent Computing, Communication, and Devices (ICCD 2023), 2023, Hong Kong, China

Abstract

Overhead transmission lines are subjected to long-term vibration loads, which can easily produce cracks and broken strands, affecting the safe operation of the power grid. Steel-core aluminum stranded conductor is commonly used in overhead transmission lines, conductor strand structure is complex, therefore, the need to "nominal" bending stiffness to characterize its bending capacity, that is, the equivalent bending stiffness of overhead transmission lines. When the equivalent bending stiffness of the conductor suspension point and near the exit of the fixture changes due to fatigue, it will amplify the vibration level of the place, which in turn affects the arc sag and air gap of the conductor. The paper for the occurrence of transmission line breeze vibration characteristics, analysis of the equivalent bending stiffness near the suspension point of the tension tower conductor, the establishment of a 3D model of the conductor, using a large sparse solution matrix as a calculation method, the calculation of the equivalent bending stiffness of the conductor under different constraint length,on this basis, further analysis of the number of broken strands andbroken strand displacement on the equivalent stiffness of the impact. The calculation results show that the equivalent bending stiffness of the conductor decreases with the increase of the constraint length, decreases with the increase of the number of broken strands, and shows a trend of first decreasing and then increasing with the increase of the displacement of broken strands.

Citation Download Citation

Xifeng Lv and Dong Qi "Research on equivalent bending stiffness of overhead transmission lines", Proc. SPIE 12703, Sixth International Conference on Intelligent Computing, Communication, and Devices (ICCD 2023), 127032Q (16 June 2023); https://doi.org/10.1117/12.2682895

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KEYWORDS

Vibration

Aluminum

Simulations

Bending stress

Solids

3D modeling

Design and modelling

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