평등, 불평등 전계에서 AC전압의 SF6/CF4 혼합가스 절연내력 특성

초록

Although many studies have been carried out about binary gas mixtures with SF6, few studies were presented about breakdown characteristics of SF6/CF4 mixtures. At present study the breakdown characteristics of SF6/CF4 mixtures in uniform and nonuniform field was performed. The experiments were carried out under AC voltages. The sphere-sphere electrode whose gap distance was 1 mm was used and the point-plane electrode whose gap distance was 3 mm was used in a test chamber. SF6/CF4 mixture contained 20% SF6 and 80% CF4 and the experimental gas pressure ranged from 0.1 to 0.5 MPa. The results show that addition of SF6/CF4 mixtures increase AC breakdown voltages. In uniform field the breakdown voltages of gas were linearly increased according to the pressure. However in nonuniform field the breakdown voltages of gas were increased nonlinearly.