Conceptual Design and Feasibility Study of Flexible Gas-Insulated Transmission Line Using CF3I Gas Mixture
Conceptual Design and Feasibility Study of Flexible Gas-Insulated Transmission Line Using CF3I Gas Mixture
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CF3I气体混合物柔性气体绝缘输电线路概念设计与可行性研究
DOI：
10.1109/tdei.2021.009605
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发表时间：
2021
影响因子：
3.1
通讯作者：
Akiko Kumada and Kunihiko Hidaka
中科院分区：
文献类型：
--
作者：
Chihiro Tateyama;Takuto Kobayashi;Akiko Kumada and Kunihiko Hidaka
SF6气体作为绝缘介质具有优良的特性，在高压设备中得到广泛应用。然而，SF6是一种强温室气体，因此其使用和排放受到管制。CF3I作为SF6替代气体的候选气体已被研究，其环境影响远小于SF6和其他氟碳化合物基气体。此外，柔性气体绝缘输电线路（FGIL）由于其高灵活性和低电容，预计将用于海上风电场的电力传输。本文从耐电压的角度，结合实际雷电冲击试验，对22 kV级大气压CF3I气体FGIL的可行性进行了评估。综合考虑绝缘条件、传热条件、鞘层电场条件和垫片应力条件，确定了FGIL的截面尺寸。对FGIL进行了平直和弯曲状态下的冲击试验，结果表明：平直状态下的50%击穿电压超过22 kV级雷电冲击耐受电压，弯曲状态下的50%击穿电压低于22 kV级雷电冲击耐受电压。
SF6is widely used in high voltage equipment because of its outstanding characteristics as insulation medium. However, SF6is a potent greenhouse gas, so its use and emission are regulated. CF3I has been investigated as a candidate for SF6alternative gas, whose environmental impact is much less than that of SF6and 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 CF3I 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 voltageof straight state exceeded lightning impulse withstand voltage (LIWV) for 22 kV class, and thatof bent state falls below LIWV.