Compatibility between C6F12O-N2 Gas Mixture and Sealing Material Nitrile Butadiene Rubber
Lan Jiaqi1, Tian Shuangshuang1, Li Xiaohan1, Rao Xiajin2, Zhang Xiaolong3
1. Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment Hubei University of Technology Wuhan 430068 China; 2. Electric Power Research Institute of Guangxi Power Grid Co. Ltd Nanning 530000 China; 3. Maintenance Company of State Grid Chongqing Electric Power Company Chongqing 400039 China
Abstract The new environment-friendly insulating medium C6F12O has good potential to apply in medium and low voltage equipment due to its excellent environmental properties and good insulation performance. In order to evaluate the reliability of long-term safe and stable of C6F12O/N2 gas mixture in the equipment, it is necessary to study the compatibility between C6F12O/N2 gas mixture and sealing rubber. In this paper, the compatibility of C6F12O/N2 gas mixture with NBR is studied by using thermal acceleration method. The composition products of gas mixture and the morphology properties of nitrile Butadiene Rubber (NBR) are revealed based on fourier transform infrared spectrometer and scanning electron microscope respectively. Meanwhile, the formation path of gas decomposition products is simulated based on density functional theory, and the interaction process between NBR and C6F12O molecules is calculated. It is found that NBR rubber is incompatible with the C6F12O/N2 gas mixture at temperatures higher than 90℃. There exists chemical reactions between NBR and C6F12O/N2 gas mixture, resulting in the generation of gaseous byproducts including C3F6, NF3 and CS2 and the precipitation of while crystal particles on the surface of NBR. The theoretical calculation also shows that the increase of temperature can promote the decomposition of NBR molecules, and the gas-solid reaction between C6F12O and NBR tends to form new substances. The study results can provide important theoretical and technical guidance for engineering application of the C6F12O/N2 gas mixture.
Lan Jiaqi,Tian Shuangshuang,Li Xiaohan等. Compatibility between C6F12O-N2 Gas Mixture and Sealing Material Nitrile Butadiene Rubber[J]. Transactions of China Electrotechnical Society, 2022, 37(5): 1285-1293.
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2022, Vol. 37 
