Semiconductor Physics, Quantum Electronics & Optoelectronics, 24 (4), P. 413-418 (2021).

Dielectric properties of Shell transformer oil with impurities of carbon nanotubes and fullerene C60
O.V. Kovalchuk 1,2,3,*, I.P. Studenyak4, T.M. Kovalchuk5, E.A. Ayryan6,7,8, K. Paulovičová9, M. Timko9, P. Kopčanský9

1Kyiv National University of Technologies and Design, 2, Nemirovich-Danchenko str., 01011 Kyiv, Ukraine
2National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”
37, prospect Peremohy, 03056 Kyiv, Ukraine
3Institute of Physics, NAS of Ukraine, 46, prospect Nauky, 03680 Kyiv, Ukraine
4Uzhhorod National University, 46, Pidgirna str., 88000 Uzhhorod, Ukraine
5V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 41, prospect Nauky, 03680 Kyiv, Ukraine
6Meshcheryakov Laboratory of Information Technology, JINR,
Joliot-Curie str. 6, 141980 Dubna, Moscow region, Russia
7Dubna State University, Universitetskaya str. 19, 141980 Dubna, Moscow region, Russia
8Alikhanyan National Science Laboratory (Yerevan Physics Institute),
Alikhanian Brothers str. 2, 0036 Yerevan, Armenia
9Institute of Experimental Physics, Slovak Academy of Sciences
47, Watsonova str., 04001 Košice, Slovakia

Abstract. At the temperature 293 K, the influence of two types of nanoimpurities (carbon multiwall nanotubes and C60 fullerene) both separately and together on the dielectric properties of Shell transformer oil has been studied. It has been shown that these impurities do not significantly effect on the value of the dielectric permittivity of Shell oil, but more significantly increase its conductivity. It has been found that in the presence of nanotubes inside Shell oil, the dependence of its electrical conductivity on the fullerene concentration is nonmonotonic. The samples with the fullerene concentration 100 ppm have the highest conductivity. At the fullerene concentration 300 ppm, the conductivity of Shell oil with the impurities of carbon nanotube and C60 fullerene becomes almost equal to the electrical conductivity of Shell oil only with the impurities of carbon nanotubes. It has been suggested that C60 fullerene can be used to reduce the electrical conductivity of Shell oil with magnetic nanoparticles required to increase the cooling efficiency of transformers under the action of their own magnetic field

Keywords:carbon multiwall nanotubes, fullerene C60, transformer oil, dielectric permittivity, electrical conductivity.

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