SF 6 is widely used in high voltage equipment because of its outstanding characteristics as insulation medium. However, SF 6 is a potent greenhouse gas, so its use and emission are regulated. CF 3 I has been investigated as a candidate for SF 6 alternative gas, whose environmental impact is much less than that of SF 6 and other fluorocarbon-based gases. In addition, a flexible gas-insulated transmission line (FGIL) is expected to be used for power transmission from offshore wind farms due to its high flexibility and low capacitance. In this paper, the feasibility of 22 kV class FGIL utilizing atmospheric pressure CF 3 I gas is evaluated from the viewpoint of withstand voltage with actual lightning impulse tests. The cross-sectional size of FGIL is determined by considering insulation condition, heat transfer condition, sheath electric field condition and spacer stress condition. The impulse tests for FGIL are conducted in straight and bent states, and it is revealed that the 50% breakdown voltage $V_{50}$ of straight state exceeded lightning impulse withstand voltage (LIWV) for 22 kV class, and that $V_{50}$ of bent state falls below LIWV.

中文翻译：

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CF3I混合气柔性气体绝缘输电线路概念设计及可行性研究

顺丰 6因其作为绝缘介质的突出特性而广泛应用于高压设备中。然而，顺丰 6是一种强效温室气体，因此其使用和排放受到管制。CF 3 我被调查为SF候选人 6 替代气体，其环境影响远小于SF 6和其他碳氟化合物基气体。此外，柔性气体绝缘输电线路（FGIL）由于其高灵活性和低电容，有望用于海上风电场的电力传输。在本文中，22 kV 级 FGIL 利用大气压 CF 的可行性 3 I gas 是从耐压的角度通过实际的雷电冲击试验来评估的。FGIL 的横截面尺寸是通过考虑绝缘条件、传热条件、护套电场条件和间隔件应力条件来确定的。FGIL 的脉冲测试在直线和弯曲状态下进行，显示 50% 击穿电压$V_{50}$ 直态超过 22 kV 级的雷电冲击耐受电压 (LIWV)，并且 $V_{50}$ 弯曲状态低于 LIWV。