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Author: search.filters.author.Pattanadech, NorasageSubject: search.filters.subject.Weibull analysis

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    Impulse breakdown characteristic of mineral oil based nanofluid
    (2017-11-29)
    Muangpratoom, Pichai
    ;
    Pattanadech, Norasage
    ;
    Kunakorn, Anantawat
    ;
    Vittayakorn, Wanwilai
    Mineral-oil based nanofluids are proved that the addition of suitable nanoparticles can increases the AC breakdown voltage and Partial Discharge Inception Voltage (PDIV) compared with those of the unmodified mineral oil. In this paper, a standard impulse breakdown voltage of the mineral oil and the mineral-oil based nanofluids is investigated. Three types of nanoparticle, i.e., Zinc oxide (ZnO), Barium titanate (BaTiO<inf>3</inf>) and Titanium dioxide (TiO<inf>2</inf>) with the mean diameter less than 100 nm are used to prepare the nanofluid samples. The first group of the nanofluid sample consists of the mineral oil mixed with the 0.01% volume fraction of nanoparticle. Another group of nanofluid sample comprises the mineral oil mixed with the 0.03% volume fraction of nanoparticle. Besides, the surfactant sorbitan monooleate (Span 80) is added in order to modify the surface of the nanoparticles. The needle-sphere electrode configuration with the gap spacing of 15 mm is employed for impulse breakdown voltage investigation of the dielectric liquids. The test circuit is set up in accordance with IEC 60897, and the test experiment is performed at the room temperature. The results show that the addition of ZnO and TiO2 nanoparticle leads to the change in the impulse breakdown characteristics of the mineral oil in both positive and negative impulse polarities. However, no significant change in the impulse breakdown characteristics is observed when adding BaTiO3 to the oil.
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    Dielectric breakdown strength of mineral oil based nanofluids
    (2016-11-28)
    Muangpratoom, Pichai
    ;
    Pattanadech, Norasage
    In this paper, the dielectric properties of the mineral oil-based nanofluids was studied. The aim of this research is to improve electrical property of the mineral oil by applying nanotechnology knowledge. Three types of nanoparticle i.e. Titanium dioxide (TiO<inf>2</inf>), Barium titanate (BaTiO<inf>3</inf>) and Zinc oxide (ZnO) with the mean diameter less than 100 nm were used in the experiment. The nanofluid samples, the mineral oil mixed with nanoparticle, were prepared in three processes. Firstly, the mineral oil was mixed with 0.01% of nanoparticle volume fraction of nanoparticle. Besides, the mineral oil was also mixed with 0.03% of nanoparticle volume fraction. Then it was dispersed by using a magnetic stirrer. Finally, the ultrasonic dispersant technique was applied for the prepared nanofluids to ensure the homogeneity of such liquid. To measure the AC breakdown voltages, an oil breakdown tester (FOSTER OTS 60AF) was used. The gap distance between electrodes was set to be 2.5 mm. The testing was carried out 6 times for each liquid test sample according to IEC 60156. The test results showed that the AC breakdown property of the modified liquid was strongly influenced by the type of the nanoparticles added. With the addition of nanoparticles, the AC breakdown voltage increased slightly above that of the mineral oil (37 kV). In case of 0.01% nanoparticle volume fraction, the AC breakdown voltage of the mineral oil with TiO<inf>2</inf>, the mineral oil with BaTiO<inf>3</inf> and the mineral oil with ZnO was 42 kV, 45 kV and 46 kV respectively. For 0.03% nanoparticle volume fraction, the AC breakdown voltage of the mineral oil with TiO<inf>2</inf>, the mineral oil with BaTiO<inf>3</inf> and the mineral oil with ZnO was 45 kV, 48 kV and 60 kV respectively. From these results, it is indicated that nanoparticles is a good candidate to develop mineral oil-based nanofluids for dielectric applications.