Abstract :
The dependence of the recovery speed on the pressure and on dI/dt was obtained, for both air and SF6, in a model interrupter of axial flow type employing a Laval nozzle. The measurements were carried out for pressures extending from 100-600 psi (6.8-41 atm) and for dI/dt values ranging from 5-30 A/¿s. For both gases the recovery speed was found to increase with pressure, varying as the first power for air and as the 1.4 power for SF6. A stronger than expected dependence on dI/dt was also found for both air and SF6, the recovery speed varying inversely as the square in each case.
