Ensuring the Structural Safety of Overhead Transmission Lines by Design
Publication: Journal of Aerospace Engineering
Volume 34, Issue 3
Abstract
During service, transmission lines (TLs) will be subjected to unbalanced longitudinal loads due to events such as conductor breakage, insulator failure, and sudden ice shedding, which may damage TLs and subsequently hinder reliable power supply. Although unbalanced longitudinal loads are considered in current design codes, damage to TLs still occasionally occurs. This paper reviews the literature from the last pertaining to the response of TLs induced by the abovementioned events and associated tower failures. It comprises four main sections in relation to the sources of large unbalanced accidental loads: conductor breakage, sudden ice shedding, insulator breakage, and tower failure. Structural analysis methods to investigate these accidents are reviewed, and the latest research progress on modeling tower failure is discussed. Chinese code, American code and International Electrotechnical Commission code are compared to analyze the differences in accounting for longitudinal loads in these codes. In the end, several recommendations are provided for future design and research to ensure the structural safety of TLs.
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
The research described in this paper was financially supported by the National Natural Science Foundation of China (Grant No. 51808100), the Fundamental Research Funds for the Central Universities (Grant No. N170108029), Liaoning Provincial Natural Science Foundation of China (Grant No. 2019-ZD_0004), and the Scholarship from China Scholarship Council (Grant No. 201906085036).
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Information
Published In
Journal of Aerospace Engineering
Volume 34 • Issue 3 • May 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: May 18, 2020
Accepted: Oct 14, 2020
Published online: Feb 4, 2021
Published in print: May 1, 2021
Discussion open until: Jul 4, 2021
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