Li Yalong, Zhang Xiaoxing, Xie Cheng, Wei Zhuo, Xiao Song, Tang Ju
School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, P. R. China.
State Grid Zhejiang Electric Power Research Institute, Hangzhou 310007, P. R. China.
ACS Omega. 2021 Oct 19;6(43):28770-28778. doi: 10.1021/acsomega.1c03491. eCollection 2021 Nov 2.
The eco-friendly insulating medium CFO gas has attracted the attention of many researchers due to its superior environmental protection and insulation properties. However, there are few studies on the compatibility of CFO gas with sealing materials for the gas-insulated equipment (GIE), which will bury hidden dangers for its engineering application. In this study, the compatibility of CFO gas with an ethylene propylene diene monomer (EPDM) sealing material which is most used in equipment was tested, and its reaction mechanism was simulated. The study found that the O element on the carbonyl group of CFO gas has high chemical reactivity and will interact with EPDM rubber. During the interaction process, EPDM rubber will also react with the CF gas generated by the decomposition of CFO gas, and at the same time, it will also decompose CFO gas to produce more CFO and CHF. The surface of EPDM rubber will produce oily substances and a large number of crystal particles, which will cause its mechanical properties to deteriorate and shorten its service life. Therefore, it is necessary to carry out anti-corrosion treatment on the surface of EPDM rubber or replace the sealing material with better compatibility when designing and manufacturing GIE.
环保型绝缘介质CFO气体因其卓越的环保和绝缘性能而受到众多研究者的关注。然而，关于CFO气体与气体绝缘设备（GIE）密封材料兼容性的研究较少，这将为其工程应用埋下隐患。本研究测试了CFO气体与设备中最常用的三元乙丙橡胶（EPDM）密封材料的兼容性，并模拟了其反应机理。研究发现，CFO气体羰基上的O元素具有较高的化学反应活性，会与EPDM橡胶发生相互作用。在相互作用过程中，EPDM橡胶还会与CFO气体分解产生的CF气体发生反应，同时，它也会分解CFO气体生成更多的CFO和CHF。EPDM橡胶表面会产生油性物质和大量晶体颗粒，这将导致其机械性能恶化并缩短使用寿命。因此，在设计和制造GIE时，有必要对EPDM橡胶表面进行防腐处理或更换兼容性更好的密封材料。
