Space Charge Distribution of Surface Discharge in SF₆ Gas

Abstract

Surface space-charge distributions produced by streamers in SF₆ are investigated using the probe method with a high speed temporal resolution. Probes which also act the role of a plane electrode, are used for measuring the space-charge field. The fields are measured oscilloscopically and converted into space-charge densities by a numerical calculation. This inverstigation has revealed the charge distribution before the disturbance caused by the well known “back-discharge”. This method is also applied for surface discharges in air, and its results are compared with that obtained in SF₆.