Collapse Analysis of a Transmission Tower-Line System Induced by Ice Shedding

Jiaxiang Li,Jian Sun,Xing Fu,Biao Wang,Xiaohong Zhang,Shuhong Wang

doi:10.3389/fphy.2021.712161

Jiaxiang Li, Jian Sun + Show 4 more

Open Access

https://doi.org/10.3389/fphy.2021.712161

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Abstract

Ice shedding causes transmission lines to vibrate violently, which induces a sharp increase in the longitudinal unbalanced tension of the lines, even resulting in the progressive collapse of transmission towers in serious cases, which is a common ice-based disaster for transmission tower-line systems. Based on the actual engineering characteristics of a 500 kV transmission line taken as the research object, a finite element model of a two-tower, three-line system is established by commercial ANSYS finite element software. In the modeling process, the uniform mode method is used to introduce the initial defects, and the collapse caused by ice shedding and its influencing parameters are systematically studied. The results show that the higher the ice-shedding height is, the greater the threat of ice shedding to the system; furthermore, the greater the span is, the shorter the insulator length and the greater the dynamic response of the line; the impact of ice shedding should be considered in the design of transmission towers.

Highlights

As the physical electricity-carrying entities of the power transmission network, transmission lines often need to pass through severely cold areas, and as a result, ice may occasionally coat the conductors
Kollar and Farzaneh [11,12,13,14] introduced a spacer bar into the conductor iceshedding model, studied the ice shedding of the bundle conductor, and obtained the relationships between the maximum jump height and the ice thickness, initial tension, conductor spacing, and Collapse Analysis of a Transmission Tower-Line number of sub-conductors; a scale test verified the validity of the model, and the results showed that a spacer bar can effectively reduce the jump height of the conductor but has little effect on the torsion of the conductor
A numerical model of a two-tower, three-line transmission tower-line system is established, and the damage of the transmission line caused by ice shedding is studied

Summary

INTRODUCTION

As the physical electricity-carrying entities of the power transmission network, transmission lines often need to pass through severely cold areas, and as a result, ice may occasionally coat the conductors. The response of the tower-line system is reduced, indicating that the length of the selected insulator should be increased as much as possible within the allowable range in the design process of the transmission line

CONCLUSION

Findings

DATA AVAILABILITY STATEMENT