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Nanofluid‐based transformer oil: effect of ageing on thermal, electrical and physicochemical properties

2018; Institution of Engineering and Technology; Volume: 12; Issue: 7 Linguagem: Inglês

10.1049/iet-smt.2017.0475

1751-8830

Mrutyunjay Maharana, Moon Moon Bordeori, Sisir Kumar Nayak, Niranjan Sahoo,

High voltage insulation and dielectric phenomena

The development of nanofluids is necessary to replace the conventional transformer oil used in power and distribution transformers. A stable nanofluid has been prepared to verify its insulating and heat transfer performance in oxidative ageing environment. Due to the superior thermal and electrical properties of a nanoparticle (NP), its dispersion in mineral oil (MO) is expected to improve the dielectric and cooling properties of the nanofluid. This study presents a comparative assessment of the pre- and post-ageing effects on MO and nanofluids. An open beaker, single temperature oxidative thermal ageing experiment is performed at 115°C for different ageing times, i.e. 164, 328, and 492 h. A concentration of 0.01 wt% of NP for both titanium oxide and exfoliated hexagonal boron nitride (Eh-BN) is dispersed into a base fluid, i.e. MO, to prepare nanofluids. The important thermal, electrical and physicochemical properties of all the three insulating oils are analysed. The superior thermal, electrical and physicochemical performance of Eh-BN/MO-nanofluid is observed to be superior. Higher thermal conductivity, insulation and hydrophobic Eh-BN NPs on dispersion with MO provide better cooling and insulation even after an ageing, thus confirm its usability as a novel nanofluid-based transformer oil.