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Copper sulfide deposition on oil-paper insulation will lead to insulation deteriorations or failures in power transformers. Recently, nanoparticles have exhibited great potential in improving dielectric strength of transformer oil. In this work, we aim to investigate the effect of semiconductive nanoparticle on the sulfur corrosion behaviors in the oil-paper insulation by adding certain amount of...
In this paper, semiconducting nanoparticles were used to modify the transformer oil by means of sonication. AC and lightning breakdown voltages of the transformer oil samples were measured before and after modifying according to IEC standards. Test results of every oil sample based on 30 breakdowns were used to model the probability distribution of breakdown voltage by Weibull statistical method....
Transformer is one of the most important components of electric system. Their remaining life largely depends on what degree the insulation has been degraded as a consequence of ageing. Based on our previous investigation, a new type of transformer oil-based nanofluids with TiO2 semiconductive nanoparticles exhibit substantially higher AC and positive impulse breakdown voltage levels than that of pure...
A class of mineral oil-based nanofluid has been developed by modifying mineral oil with TiO2 nanoparticle to enhance their dielectric performance. In this paper, we present the investigation results of aged nanofluids, which have been subjected to accelerated aging condition of 130°C for 6 days. Both AC breakdown voltage and PDIV tests were carried out according to ASTM standards respectively. It...
A new class of colloidal dielectric fluids is formulated by mixing TiO2 nanoparticle with transformer oil in order to enhance the dielectric performance of mineral oil. To investigate the impact of this change, both AC and lightning breakdown voltage tests were carried out according to IEC standard respectively. The results of AC tests indicate that mean value and 1% probability breakdown voltage...
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