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The 500 kV oil-filled submarine cable is a critical infrastructure component for energy interconnection, and the selection of its actual current-carrying capacity is essential to ensure safe operation. To meet the high-load demands of submarine cables under safe conditions, this study establishes both steady-state and transient electro-thermal models for a 500 kV oil-filled submarine cable section. Based on IEC 60287, a load capacity verification scheme for the landing section of the submarine cable is developed, and the influence of different operating currents and environmental temperatures on cable operating temperature is analyzed. The study results indicate that under the rated ambient temperature of 30 °C, when the cable current increases from 800 to 1000A, the steady-state conductor temperature rises from 88.5 to 114.5 °C, demonstrating a significant impact of current on cable temperature. Furthermore, through transient overload analysis, this study calculates the safe overload time limits, temporary overload time limits, and emergency overload time limits under different operating conditions, providing a theoretical basis for optimizing submarine cable operation.In addition, this study innovatively proposes a transient overload scheme for 500 kV oil-filled submarine cables, enhancing their capability and safety in responding to extreme operating conditions.

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Overload Capacity Analysis of 500 kV Oil-Filled Submarine Cables in a Regional Interconnection Project

  • 会议论文

  • 发表日期：

    2026年

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  • Chenglin Shao,
  • Qingsong Liu,
  • Yong Sun,
  • Zerui Wang,
  • Liang Zou,
  • Zhiyun Han,
  • Yu Zhou,
  • Xin Wang

摘要

The 500 kV oil-filled submarine cable is a critical infrastructure component for energy interconnection, and the selection of its actual current-carrying capacity is essential to ensure safe operation. To meet the high-load demands of submarine cables under safe conditions, this study establishes both steady-state and transient electro-thermal models for a 500 kV oil-filled submarine cable section. Based on IEC 60287, a load capacity verification scheme for the landing section of the submarine cable is developed, and the influence of different operating currents and environmental temperatures on cable operating temperature is analyzed. The study results indicate that under the rated ambient temperature of 30 °C, when the cable current increases from 800 to 1000A, the steady-state conductor temperature rises from 88.5 to 114.5 °C, demonstrating a significant impact of current on cable temperature. Furthermore, through transient overload analysis, this study calculates the safe overload time limits, temporary overload time limits, and emergency overload time limits under different operating conditions, providing a theoretical basis for optimizing submarine cable operation.In addition, this study innovatively proposes a transient overload scheme for 500 kV oil-filled submarine cables, enhancing their capability and safety in responding to extreme operating conditions.