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Preparation of Three Transformer Oil-Based Nanofluids and Comparison of Their Impulse Breakdown Characteristics

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Nanopaticles can enhance the insulation performance of transformer oil. Three types of nanoparticles with different conductivities, namely, conductive magnetic nanoparticle Fe3O4, semiconductive nanoparticle TiO2, and non-conductive nanoparticle Al2O3, were chosen and dispersed into transformer oil to form nanofluids. The dispersion stability of nanoparticles in each type of nanofluid was verified. The switching impulse and lightning impulse breakdown strengths of the oil samples with and without nanoparticle modifications were measured. Results indicate that the addition of nanoparticles can enhance the insulation strength of transformer oil, but not the negative lightning impulse breakdown strength. The space charge distributions in pure oil and nanofluids under impulse voltages were analyzed to study the effect of nanoparticles on trapping electrons and enhancing the insulation property of oil. Different effect mechanisms of conductive and dielectric nanoparticles were also used to explain the difference among three nanofluids.
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Keywords: BREAKDOWN CHARACTERISTICS; MECHANISM ANALYSIS; NANO-MODIFICATION; TRANSMISSION COEFFICIENTS

Document Type: Short Communication

Publication date: March 1, 2014

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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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