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<p>As a potential alternative medium to SF<sub>6</sub> in cubicle-type gas-insulated switchgear (C-GIS), dry air's relatively low thermal conductivity and convective heat transfer capacity significantly increase the risk of local overheating in the equipment under high-current operating conditions. Therefore, this paper constructs a three-dimensional multi-physical field coupling model of electromagnetics—heat—fluid, which is verified by the temperature rise test with a maximum deviation of less than 4&#xa0;K. The research results show that radiation is the main heat dissipation path. Although the convective heat transfer is weak, there is a nonlinear synergistic effect with radiation heat dissipation, which can further reduce the hot-spot temperature. Under the condition of contact resistance deterioration, the hot-spot temperature rise shows a significant nonlinear increase, and the phase B component is always the most sensitive part to temperature rise. When the hot-spot temperature rise exceeds the reference value by 20–25&#xa0;K, it can be used as the threshold for early fault warning. This study reveals the heat dissipation mechanism and fault evolution law of dry air-insulated C-GIS, providing a theoretical basis for the condition monitoring, fault warning, and structural design of future SF<sub>6</sub>-free switchgear.</p>

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Thermal performance and fault prognosis of dry air-insulated C-GIS: a multiphysics and experimental study

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Yong Cui,
  • Qianqian Cui,
  • Daoye Luo,
  • Jianbo Dong,
  • Meng Cui,
  • Xiaogang Zheng

摘要

As a potential alternative medium to SF6 in cubicle-type gas-insulated switchgear (C-GIS), dry air's relatively low thermal conductivity and convective heat transfer capacity significantly increase the risk of local overheating in the equipment under high-current operating conditions. Therefore, this paper constructs a three-dimensional multi-physical field coupling model of electromagnetics—heat—fluid, which is verified by the temperature rise test with a maximum deviation of less than 4 K. The research results show that radiation is the main heat dissipation path. Although the convective heat transfer is weak, there is a nonlinear synergistic effect with radiation heat dissipation, which can further reduce the hot-spot temperature. Under the condition of contact resistance deterioration, the hot-spot temperature rise shows a significant nonlinear increase, and the phase B component is always the most sensitive part to temperature rise. When the hot-spot temperature rise exceeds the reference value by 20–25 K, it can be used as the threshold for early fault warning. This study reveals the heat dissipation mechanism and fault evolution law of dry air-insulated C-GIS, providing a theoretical basis for the condition monitoring, fault warning, and structural design of future SF6-free switchgear.