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Article

Calculation Methods of High-Voltage Direct Current (HVDC) Line Sag Considering Meteorology

1
Northwest Branch of State Grid Corporation of China, Xi’an 710002, China
2
School of Mechano-Electronic Engineering, Xidian Univerisity, Xi’an 710126, China
*
Author to whom correspondence should be addressed.
Energies 2024, 17(2), 305; https://doi.org/10.3390/en17020305
Submission received: 24 October 2023 / Revised: 29 December 2023 / Accepted: 3 January 2024 / Published: 8 January 2024
(This article belongs to the Special Issue Recent Progress, Challenges and Outlooks of Insulation System in HVDC)

Abstract

Sag is one of the important indicators for judging whether a transmission line is safe. The existing sag calculation method does not consider the temperature difference between conductor strands, causing the calculated results to often deviate from the values measured with a theodolite. In this article, a sag calculation method considering the temperature difference between strands is proposed. First, finite element analysis and experiments were used to analyze the temperature differences between each area and layer of the conductor when the wind blew the conductor, and then a correction calculation model for the conductor sag was proposed. Next, a sag monitoring system based on four-point temperature measurement was designed. Finally, the method was applied to a ±400 kV transmission line in Qinghai Province, China. The results show that after considering the temperature difference in the conductor strands, the error of the sag calculation result is much smaller than that without considering the temperature difference in the conductor strands, and the maximum relative error is reduced from 7.86% to less than 2%.
Keywords: conductors; sag; temperature conductors; sag; temperature

Share and Cite

MDPI and ACS Style

Li, X.; Xie, Z.; Zeng, L.; Zhao, L. Calculation Methods of High-Voltage Direct Current (HVDC) Line Sag Considering Meteorology. Energies 2024, 17, 305. https://doi.org/10.3390/en17020305

AMA Style

Li X, Xie Z, Zeng L, Zhao L. Calculation Methods of High-Voltage Direct Current (HVDC) Line Sag Considering Meteorology. Energies. 2024; 17(2):305. https://doi.org/10.3390/en17020305

Chicago/Turabian Style

Li, Xin, Zuibing Xie, Linping Zeng, and Long Zhao. 2024. "Calculation Methods of High-Voltage Direct Current (HVDC) Line Sag Considering Meteorology" Energies 17, no. 2: 305. https://doi.org/10.3390/en17020305

APA Style

Li, X., Xie, Z., Zeng, L., & Zhao, L. (2024). Calculation Methods of High-Voltage Direct Current (HVDC) Line Sag Considering Meteorology. Energies, 17(2), 305. https://doi.org/10.3390/en17020305

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