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

Author

Listed:
  • 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)

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%.

Suggested Citation

  • Xin Li & Zuibing Xie & Linping Zeng & Long Zhao, 2024. "Calculation Methods of High-Voltage Direct Current (HVDC) Line Sag Considering Meteorology," Energies, MDPI, vol. 17(2), pages 1-13, January.
  • Handle: RePEc:gam:jeners:v:17:y:2024:i:2:p:305-:d:1314774
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    References listed on IDEAS

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    1. Yongdou Liu & Zhiwei Chen & Quan Gu, 2020. "Numerical Algorithms for Calculating Temperature, Layered Stress, and Critical Current of Overhead Conductors," Mathematical Problems in Engineering, Hindawi, vol. 2020, pages 1-14, April.
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      conductors; sag; temperature;
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