Dielectric Insulation Characteristics of Natural Ester Fluid Modified by Colloidal Iron Oxide Ions and Silica Nanoparticles

Vasilios P. Charalampakos, Georgios D. Peppas, Eleftheria C. Pyrgioti, Aristides Bakandritsos, Aikaterini D. Polykrati and Ioannis F. Gonos
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Vasilios P. Charalampakos: Department of Electrical and Computer Engineering, University of the Peloponnese, 26334 Patras, Greece
Georgios D. Peppas: Department of Electrical and Computer Engineering, University of Patras, 26500 Patras, Greece
Eleftheria C. Pyrgioti: Department of Electrical and Computer Engineering, University of Patras, 26500 Patras, Greece
Aristides Bakandritsos: Regional Centre for Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic
Aikaterini D. Polykrati: School of Electrical and Computer Engineering, National Technical University of Athens, 15780 Athens, Greece
Ioannis F. Gonos: School of Electrical and Computer Engineering, National Technical University of Athens, 15780 Athens, Greece

Energies, 2019, vol. 12, issue 17, 1-11

Abstract: In this study, the dielectric characteristics of two types of natural esters modified into nanofluids are studied. The AC breakdown voltage was investigated for colloidal Fe 2 O 3 and SiO 2 nanoparticles effectively scattered in natural ester oil. The experimental results identify an increase in the breakdown voltage of the nanofluid with colloidal Fe 2 O 3 conductive nanoparticles. In contrast, the breakdown voltage was reduced by adding SiO 2 nanoparticles in the same matrix. The potential well distribution of the two different types of nanoparticles was also calculated in order for the results of the experiment to be explained. The dielectric losses of the colloidal nanofluid are compared with the matrix oil and studied at 25 °C and 100 °C in the frequency regime of 10 −1 –10 6 Hz. The experimental data and the theoretical study reveal that conductivity along with the permittivity of nanoparticles constitute a pivotal parameter in the performance of nanofluid. Specific concentrations of nanoparticles with different electrical conductivity and permittivity than those of matrix oil increase the breakdown voltage strength. Simultaneously, the addition of nanoparticles having electrical conductivity and permittivity comparable to the matrix oil results in reducing the breakdown voltage.

Keywords: nanofluids; nanoparticles; breakdown strength; transformer oils; permittivity; conductivity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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