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Dielectric Loss of Transformer Oil-Based Nanofluids: Effects of Oil Temperature and Nanoparticle Concentration

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Dielectric loss quantifies inherent dissipation of the transformer oil-based nanofluids (NFs), which determines the operating loss and aging rate of the insulation system. Our experiment on zinc-oxide/silica NFs shows that the dielectric dissipation factor (DF) increases linearly with increasing nanoparticle volumetric concentration ranging from 0.02 to 0.25 vol.‰ and exponentially with increasing temperature ranging from 20 to 90 °C. These tendencies are well explained and estimated by a model proposed based on the conduction loss and nanoparticle relaxation polarization loss. It suggests that the conduction loss is significantly larger than the relaxation polarization loss in the NFs, whereas the dielectric loss is predominantly determined by the conduction loss. The additional shift of the charge carriers caused by the high oil temperature and the aggregation of the nanoparticles on account of the high concentration of the nanoparticles influence the actual DF of transformer oil-based nanofluids.
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Keywords: CONCENTRATION; DIELECTRIC LOSS; TEMPERATURE; TRANSFORMER OIL-BASED NANOFLUIDS

Document Type: Short Communication

Publication date: September 1, 2017

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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