Abstract：The compatibility between gas and solid insulating materials in gas insulated transmission lines (GIL) is defined as follows: the changes of insulation performance caused by long-term contact between the two materials and the changes of gas composition and solid material. As an environmental-friendly insulating gas with potentiality to replace SF6, the compatibility between C3F7CN/CO2 and epoxy resin used in GIL needs to be studied urgently to avoid insulation failure of equipment. The authors proposed the method for evaluating the compatibility and set up a gas-solid compatibility test platform in this paper. Thermal acceleration tests of C3F7CN/CO2 and epoxy resin are carried out at different temperatures. Also, the control groups of SF6 and He gas were set to distinguish the influence of temperature. Dielectric loss, surface flashover voltages, surface morphology of epoxy resin and gas composition before and after the tests were compared. A small amount of C3F6 and trimer of C3F7CN were found after testing at 160℃ and the surface insulation properties of epoxy resins did not deteriorate. Tests results shows the compatibility between C3F7CN/CO2 and epoxy resin is as good as the compatibility between SF6 and epoxy resin under normal operation of GIL.
袁瑞君, 李涵, 郑哲宇, 周文俊, 叶三排. 气体绝缘输电线路用C3F7CN/CO2混合气体与环氧树脂相容性试验[J]. 电工技术学报, 2020, 35(1): 70-79.
Yuan Ruijun, Li Han, Zheng Zheyu, Zhou Wenjun, Ye Sanpai. Experiment on the Compatibility between C3F7CN/CO2 Gas Mixture and Epoxy Resin Used in Gas Insulated Transmission Line. Transactions of China Electrotechnical Society, 2020, 35(1): 70-79.
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