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The Ultra High Voltage Direct Current (UHV DC) through-wall bushing serves as vital equipment linking the valve hall and the external DC field in DC power transmission projects. Operating under conditions of high current, elevated temperatures, and significant mechanical loads, the bushing's casing experiences notable electrical, thermal, and mechanical stresses. This interplay of factors contributes to its high failure rate among primary equipment at converter stations. This paper investigates and analyzes the distribution characteristics of temperature rise under typical working conditions and identifies the primary factors influencing temperature rise in DC bushings during operation through simulation experiments and field investigations. Additionally, it conducts electrothermal coupling calculations to analyze the variation of temperature gradient in the capacitor core under different loads and its impact on electric field distribution. Furthermore, it identifies key components affected by temperature rise and proposes solutions to mitigate temperature rise induced by increased current through casing structure optimization. Lastly, the paper examines the improvement in electric field distribution resulting from temperature field optimization studies.

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A Scheme for Suppressing Local Temperature Rise in High-Voltage and Large-Capacity DC Through-Wall Bushings

  • 会议论文

  • 发表日期：

    2025年

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  • Xinfeng Jiang,
  • Peipei Fan,
  • Tao Zhu,
  • Teng Li,
  • Jun Liao,
  • Junjie Zhang,
  • Xiangyu Luo

摘要

The Ultra High Voltage Direct Current (UHV DC) through-wall bushing serves as vital equipment linking the valve hall and the external DC field in DC power transmission projects. Operating under conditions of high current, elevated temperatures, and significant mechanical loads, the bushing's casing experiences notable electrical, thermal, and mechanical stresses. This interplay of factors contributes to its high failure rate among primary equipment at converter stations. This paper investigates and analyzes the distribution characteristics of temperature rise under typical working conditions and identifies the primary factors influencing temperature rise in DC bushings during operation through simulation experiments and field investigations. Additionally, it conducts electrothermal coupling calculations to analyze the variation of temperature gradient in the capacitor core under different loads and its impact on electric field distribution. Furthermore, it identifies key components affected by temperature rise and proposes solutions to mitigate temperature rise induced by increased current through casing structure optimization. Lastly, the paper examines the improvement in electric field distribution resulting from temperature field optimization studies.