Electrostatic properties of aged fullerene-doped mineral oil

In this paper the analysis of the influence of C₆₀ fullerenes on flow electrification of mineral insulating oil during aging is presented. Three sets of samples, one fresh and two aged for 24 h and 96 h were tested for their electrification properties using an improved version of a spinning disk system. The relations between C₆₀ concentration and electrification current were determined for different rotational velocities. It is shown, that C₆₀ may significantly reduce or increase the electrification current in mineral oil, depending on fullerenes concentration. The possible causes of observed behavior are analyzed.