Effect of Fe3O4 nanoparticles on positive streamer propagation in transformer oil
Autor: | Qi Wang, Yuzhen Lv, Chengrong Li, Bo Qi, Yang Ge, You Zhou |
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Rok vydání: | 2016 |
Předmět: |
010302 applied physics
Materials science Average diameter business.industry Transformer oil General Physics and Astronomy Nanoparticle 02 engineering and technology Electron Trapping 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Space charge lcsh:QC1-999 Nanofluid Optics 0103 physical sciences 0210 nano-technology business Fe3o4 nanoparticles lcsh:Physics |
Zdroj: | AIP Advances, Vol 6, Iss 3, Pp 035110-035110-5 (2016) |
ISSN: | 2158-3226 |
Popis: | Fe3O4 nanoparticles with an average diameter of 10 nm were prepared and used to modify streamer characteristic of transformer oil. It was found that positive streamer propagation velocity in transformer oil-based Fe3O4 nanofluid is greatly reduced by 51% in comparison with that in pure oil. The evolution of streamer shape is also dramatically affected by the presence of nanoparticles, changing from a tree-like shape with sharp branches in pure oil to a bush-like structure with thicker and denser branches in nanofluid. The TSC results reveal that the modification of Fe3O4 nanoparticle can greatly increase the density of shallow trap and change space charge distribution in nanofluid by converting fast electrons into slow electrons via trapping and de-trapping process in shallow traps. These negative space charges induced by nanoparticles greatly alleviate the electric field distortion in front of the positive streamer tip and significantly hinder the propagation of positive streamer. |
Databáze: | OpenAIRE |
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