AC Breakdown Characteristics of CF3I/N-2 in a Non-uniform Electric Field

作者：Xiao, Song^*; Zhang, Xiaoxing; Han, Yefei; Dai, Qiwei

来源：IEEE Transactions on Dielectrics and Electrical Insulation, 2016, 23(5): 2649-2656.

DOI：10.1109/TDEI.2016.005756

• CF3I/N-2
• Power frequency AC breakdown
• Non-uniform electric field
• Synergistic effect
• Liquefaction temperature
• Self-recover ability

CF3I and mixed gases containing CF3I are potential substitutes of SF6 in electrical equipment. In this paper, we studied the feasibility of replacing SF6 with CF3I/N-2 in terms of power frequency breakdown performance under the influence of gas pressure, mixing ratio, and electric field. The synergistic effect, liquefaction temperature, and self-recover ability of CF3I/N-2 were analyzed. Experimental results showed that, under a highly uniform electric field, the sensitivity of the power frequency breakdown characteristics of the gases to pressure shows the order SF6>CF3I>N-2. The power frequency AC breakdown strength of CF3I/N-2 (30%/70%) at electrode distances of 5 and 10 mm could reach over 0.9 and 0.85 times that of SF6 at 0.3 MPa, respectively. CF3I/N-2 showed positive synergistic effects and the improvement was attributed to N-2. CF3I presents excellent self-recoverability. The optimum ratio of CF3I/N-2 to replace SF6 gas as insulating medium is 30% at 0.3 MPa.

• 出版日期2016-10
• 单位武汉大学