Rate of change of voltage and current as functions of pressure and nozzle area in breakers using SF6in the gas and liquid phases

The dependence of the rate of rise of the recovery voltage upon the pressure was obtained for liquid SF6 at pressures of 1500 psi. The relationship between dv/dt, di/dt and cross sectional area of the nozzle was determined experimentally, and the similarity of the results Obtained in separate investigations made with a 1/2 inch diameter nozzle has also been discussed.