抄録
Electrical characteristics of Air, CO2, etc. are studied as candidate of substitute gas for SF6. To evaluate their interruption capability as close as actual case the gas blasting with sonic velocity was applied. Authors have measured time constant (θ) and power loss coefficient (N0). In this experiment, Air, He, CO2, and SF6 and gas mixture with SF6 were varied. Among these gases it was found to be θSF6<θCO2<θair<θHe and N0SF6>N0CO2>N0air>N0He, and it is understood that the arc extinction performance of CO2 was excellent except for SF6. Moreover, the time constant became large when the rate of SF6 in mixture gas was reduced, and the power loss coefficient became small. Moreover, the simulation of the SLF interception by EMTP was performed using the obtained arc parameters of the various gases.
