SF₆代替ガスとして用いるCF₃Iガスのその適用に関する考察

抄録

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.