AC Breakdown Voltage Thermal Dependence in Magnetic Fluids

Miloš Šárpataky, M. Rajňák, J. Zbojovský, J. Kurimský
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Abstract

This study examines the AC breakdown voltage of novel transformer oil, produced using gas-to-liquid (GTL) technology, and two nanofluids prepared using this oil. The first nanofluid is a mono-nanofluid consisting of fullerene C60 nanoparticles at a concentration of 0.01 %w/V, while the other is a hybrid nanofluid called C60-loaded ferrofluid, which contains both fullerene C60 nanoparticles (0.01 %w/V) and iron oxide nanoparticles (0.01 %w/V). The AC breakdown voltage (BDV) of both nanofluids and the transformer oil was experimentally investigated at temperatures ranging from 30°C to 60°C. This experimental study reveals that the dielectric strength of pure GTL oil decreases with rising temperature by around 7 % when the lowest and the highest temperature values of AC BDV are compared. However, both nanofluids showed an increment in AC BDV value at higher temperatures and the differences in comparison to AC BDV at temperature 30°C were 5.7 % and 4.7 % for nanofluid with C60 nanoparticles and nanofluid with both kinds of nanoparticles, respectively. Enhancement of AC BDV value of nanofluids in comparison to pure oil increased with temperature and the maximal improvements reached values over 12 % for C60 nanofluids and up to 34 % for C60-loaded ferrofluid at the temperature 60°C.
磁流体中交流击穿电压的热依赖关系
本研究考察了采用气-液(GTL)技术生产的新型变压器油的交流击穿电压,以及用这种油制备的两种纳米流体。第一种纳米流体是由浓度为0.01% w/V的富勒烯C60纳米颗粒组成的单纳米流体,而另一种是称为C60负载铁磁流体的混合纳米流体,其中既含有富勒烯C60纳米颗粒(0.01% w/V),也含有氧化铁纳米颗粒(0.01% w/V)。实验研究了纳米流体和变压器油在30 ~ 60℃温度下的交流击穿电压(BDV)。实验研究表明,在比较交流BDV的最低和最高温度时,纯GTL油的介电强度随温度升高而下降约7%。然而,两种纳米流体在更高温度下都显示出AC BDV值的增加,与温度为30°C时的AC BDV相比,含有C60纳米颗粒的纳米流体和两种纳米颗粒的纳米流体的差异分别为5.7%和4.7%。与纯油相比,纳米流体的AC BDV值随着温度的升高而增加,在60°C温度下,C60纳米流体的AC BDV值最大提高超过12%,C60负载的铁磁流体的AC BDV值最高提高34%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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