摘要

SF6 is widely used in C-GIS as an insulating medium. However, SF6 and its decomposition products can pollute environment and harm human health and equipment. Firstly, this paper verifies the high-energy discharge promotes CF3I to produce C2F6 and I-2 by simulation. Therefore the paper puts forward the significance of using mixture gas to reduce the use of CF3I and control the produce of I-2. Secondly, the partial discharge inception voltages in the positive half cycle of power frequency (PDIV+) of CF3I/CO2 under different pressures, mixing ratios (k) and interelectrode distances were measured and compared with SF6/CO2. The results show that: when k is more than 10%, the PDIV+ of CF3I/CO2 is close to or higher than SF6/CO2 in the same experimental conditions; The PDIV+ of CF3I/CO2 (30%-40%) at 0.15-0.2MPa can reach the level of pure SF6 in 0.1MPa. The breakdown experiments under different electric fields shows that the breakdown characteristic of CF3I/CO2 (30%-40%) at 0.15-0.2MPa can exceed the level of pure SF6 at 0.1MPa. Considering the boiling point, producing of I-2 and insulating property, CF3I/CO2 (30%-40%) is likely to replace SF6 used in C-GIS.

  • 出版日期2015-12
  • 单位输配电装备及系统安全与新技术国家重点实验室; 重庆大学