Abstract
SF6 gas is made a problem as greenhouse gas, and a study on a substitute gas for SF6 is widely done. This paper describes a short line fault (SLF) interruption characteristic of CF3I gas, which has low environmental effects and a high dielectric strength, and CF3I-CO2 gas mixture, and it is considered to apply CF3I to the gas insulated switchgear. A SLF interruption characteristic is evaluated by measuring a di/dt-dv/dt characteristic. Pure CF3I gas has about 0.9 times of SF6 gas for a SLF interruption characteristic. Also, a SLF interruption characteristic of CF3I-CO2 gas mixture, which rate of CF3I is 20%, is equivalent of pure CF3I gas. Thus, CF3I gas can lower the liquefaction temperature by using its mixture with carbon dioxide.
