Correlation between current, emitted light, electric field and propagation velocity of positive streamers in liquid dielectrics under AC voltage

The paper reports on the search of correlations between the current and emitted light signal, electric field, and propagation velocity associated to positive streamers propagating in mineral oil, tetra-ester and toluene, in a point - plane electrode arrangement, under AC voltage. New correlations, especially between the velocity of positive streamers and the current derivative are established. The frequency spectra of different current pulses and emitted lights are also presented.