Partial discharges in voids may cause deterioration of solid insulating materials. They often start in voids enclosed in insulation and or at the interface defects. A method of measuring fast discharge pulses with rise times below 1 ns is reported. Characterisation of partial discharge pulses in artificial voids in polypropylene films at atmospheric pressure is analysed that incorlporates inception voltage , apparent and real charge , drift velocity and mobility of electrons.
A simple formula is developed to predict the sparking potentials of SF6 and SF6-gas mixture in uniform and non-uniform fields.The formula has been shown to be valid over a very wide range from 1 to 1800 kPa-cm of pressure and electrode gap [1-7, 9-13, 17-19] and it would be useful to put this data in a handy form so that it can be used conveniently in practical problems of engineering interest.There is a definite indication from the published data [5][6][7] that the sparking potential of a mixture is related to the sparking potential of pure SF6, but so far no correlation effort has been made. In
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