Effect of TiO2 and ZnO Nanoparticles on the Performance of Dielectric Nanofluids Based on Vegetable Esters During Their Aging.

Inmaculada Fernández,Carlos J Renedo,Félix Ortiz,Rafael Valiente,Alfredo Ortiz

doi:10.3390/nano10040692

Inmaculada Fernández, Carlos J Renedo + Show 3 more

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https://doi.org/10.3390/nano10040692

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Abstract

Over the last few decades the insulating performance of transformer oils has been broadly studied under the point of view of nanotechnology, which tries to improve the insulating and heat dissipation performance of transformer oils by suspending nanoparticles. Many authors have analyzed the thermal and dielectric behavior of vegetable oil based-nanofluids, however, very few works have studied the evolution of these liquids during thermal aging and their stability. In this paper has been evaluated the performance of aged vegetable oil based-nanofluids, which have been subjected to accelerated thermal aging at 150 °C. Nanoparticles of TiO2 and ZnO have been dispersed in a commercial natural ester. Breakdown voltage, resistivity, dissipation factor and acidity of nanofluid samples have been measured according to standard methods, as well as stability. Moreover, it has been analyzed the degradation of Kraft paper through the degree of polymerization (DP). The results have showed that although nanoparticles improve breakdown voltage, they increase the ageing of insulation liquids and dielectric paper.

Highlights

Transmission and distribution transformers are one of the most critical parts of the power networks
The results of the measurements performed on the samples of dielectric nanofluids and base fluid during aging are summarized
This paper evaluated the effect of TiO2 and ZnO nanoparticles on the aging of an insulation system based on a natural ester and Kraft paper

Summary

Introduction

Transmission and distribution transformers are one of the most critical parts of the power networks. Oil and paper are the most common materials in the insulation system of power transformers. These machines basically consist of a magnetic core and two conductive windings. These components are immersed in a tank that is filled with a liquid that performs two functions: dielectric insulation and cooling of the windings. This fluid is in most of the cases mineral oil. Apart from the dielectric fluid, in the transformer the conductors are surrounded by several layers of paper, which once impregnated with oil, behaves as an excellent dielectric material

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