Preparation and dielectric properties of natural ester based insulating nano-oil modified by fullerene filler

This paper is aimed at the study of preparation and dielectric properties of fullerene (C60) nano-modified natural ester based vegetable insulating oil. With the increasing demand for environmentally friendly liquid dielectrics, natural ester has applied more and more widely. However, some defects like high dielectric loss factor and low volume resistivity. C60 nanoparticles attracted tremendous attention due to its free radical scavenging capacity and electronegativity. The research prepared C60 modified vegetable insulating oil successfully, and as a comparison C60 modified mineral insulating oil was also prepared. To analyzed the dielectric properties of modified vegetable insulating oil, it confiemed that the most suitable concentration of C60 is 100 mg/L. In this concentration, dielectric loss factor, volume resistivity, AC breakdown voltage and lightning impulse breakdown voltage would be enhanced simultaneously. Meanwhile, dielectric loss factor of mineral insulating oil would be decreased clearly at 50 mg/L C60 added, and AC breakdown voltage could be increased to highest-level at 200 mg/L. However the volume resistivity was deteriorated by add C60 of mineral insulating oil. The specific mechanism of these phenomenon is not clear, but vegetable insulating oil should more suitable modified by C60 nanoparticles.

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