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

Xin Li, Zuibing Xie, Linping Zeng and Long Zhao ()
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Xin Li: Northwest Branch of State Grid Corporation of China, Xi’an 710002, China
Zuibing Xie: Northwest Branch of State Grid Corporation of China, Xi’an 710002, China
Linping Zeng: Northwest Branch of State Grid Corporation of China, Xi’an 710002, China
Long Zhao: School of Mechano-Electronic Engineering, Xidian Univerisity, Xi’an 710126, China

Energies, 2024, vol. 17, issue 2, 1-13

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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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