Analysis of Insulation Performance and Polar Effect of CF3I/CO2 Mixtures

作者：Zhao, Su; Xiao, Dengming^*; Xue, Peng; Zhong, Ruishuang; Deng, Yunkun

来源：IEEE Transactions on Dielectrics and Electrical Insulation, 2018, 25(4): 1364-1370.

DOI：10.1109/TDEI.2018.007117

• CF3I/CO2
• SF6
• lightning impulse
• polar effect
• polar reversal

SF6 gas is widely used in power systems, however, it has a strong greenhouse effect. The search for a new environmentally friendly alternative gas has become an urgent task for the power industry. In this paper, CF3I/CO2 gas mixtures in the ratio of 3:7 was tested based on a lightning impulse experimental platform. The 50% impulse breakdown voltage of CF3I/CO2 gas mixtures was determined under various pressures (0.1 similar to 0.3MPa) and gaps (5 similar to 30mm) and compared to pure SF6 gas. The results indicate that CF3I/CO2 gas mixtures has good insulation properties, reaching 0.84 times that of SF6 gas under slightly non-uniform electric field and 0.65 times that of SF6 gas in extremely inhomogeneous electric field. The polar effect of CF3I/CO2 gas mixtures was also analyzed and the coefficient K is proposed to describe and compare the differences of 50% breakdown voltages under different electric field. The results show that the polar effect of CF3I/CO2 gas mixtures under extremely inhomogeneous electric field is more obvious than that under slightly non-uniform electric field, and the polar reversal phenomenon occurs only under extremely inhomogeneous electric field. Considering various factors, CF3I/CO2 mixtures has the capability of replacing SF6 gas in power equipment such as GIL.

• 出版日期2018-8
• 单位上海交通大学