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Streaming Electrification of C 60 Fullerene Doped Insulating Liquids for Power Transformers Applications

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  • Maciej Zdanowski

    (Department of Electric Power Engineering and Renewable Energy, Faculty of Electrical Engineering, Automatic Control and Computer Science, Opole University of Technology, Prószkowska 76, 45-758 Opole, Poland)

Abstract

Long-term and fault-free operation of power transformers depends on the electrical strength of the insulation system and effective heat dissipation. Forced circulation of the insulating liquid is used to increase the cooling capacity. A negative effect of such a solution is the creation of the phenomenon of streaming electrification, which in unfavorable conditions may lead to damage to the insulating system of the transformer. This paper presents results of research confirming the possibility of using fullerene C 60 to reduce the phenomenon of streaming electrification generated by the flow of liquid dielectrics. The volume charge density q w was used as a material indicator to determine the electrostatic charging tendency (ECT) of nanofluids. This parameter was determined from the Abedian-Sonin electrification model on the basis of electrification current measurements and selected physicochemical and electrical properties of the liquid. The electrification current was measured in a flow system with an aluminum pipe of 4 mm diameter and 400 mm length. All measurements were carried out at a temperature of 20 °C. The influence of flow velocity (from 0.34 m/s to 1.75 m/s) and C 60 concentration (25 mg/L, 50 mg/L, 100 mg/L, 200 mg/L and 350 mg/L) was analyzed on the electrification of fresh and aged Trafo En mineral oil, as well as Midel 1204 natural ester and Midel 7131 synthetic ester. The density, kinematic viscosity, dielectric constant, and conductivity were also determined. A negative effect of the C 60 doping on the electrostatic properties of fresh mineral oil was demonstrated. For other liquids, fullerene C 60 can be used as an inhibitor of the streaming electrification process. Based on the analysis of the q w parameter, the optimum concentration of C 60 (from 100 mg/L to 200 mg/L) resulting in the highest reduction of the electrification phenomenon in nanofluids was identified.

Suggested Citation

  • Maciej Zdanowski, 2022. "Streaming Electrification of C 60 Fullerene Doped Insulating Liquids for Power Transformers Applications," Energies, MDPI, vol. 15(7), pages 1-14, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:7:p:2496-:d:781875
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    References listed on IDEAS

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    1. Xiaobo Wang & Chao Tang & Bo Huang & Jian Hao & George Chen, 2018. "Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers," Energies, MDPI, vol. 11(3), pages 1-31, February.
    2. Mahesh Suresh Patil & Jae-Hyeong Seo & Suk-Ju Kang & Moo-Yeon Lee, 2016. "Review on Synthesis, Thermo-Physical Property, and Heat Transfer Mechanism of Nanofluids," Energies, MDPI, vol. 9(10), pages 1-17, October.
    3. Maciej Zdanowski, 2020. "Electrostatic Charging Tendency Analysis Concerning Retrofilling Power Transformers with Envirotemp FR3 Natural Ester," Energies, MDPI, vol. 13(17), pages 1-11, August.
    4. Maciej Zdanowski, 2020. "Streaming Electrification of Nycodiel 1255 Synthetic Ester and Trafo EN Mineral Oil Mixtures by Using Rotating Disc Method," Energies, MDPI, vol. 13(23), pages 1-14, November.
    5. Jacek Fal & Omid Mahian & Gaweł Żyła, 2018. "Nanofluids in the Service of High Voltage Transformers: Breakdown Properties of Transformer Oils with Nanoparticles, a Review," Energies, MDPI, vol. 11(11), pages 1-46, October.
    6. Grzegorz Dombek & Zbigniew Nadolny & Piotr Przybylek & Radoslaw Lopatkiewicz & Agnieszka Marcinkowska & Lukasz Druzynski & Tomasz Boczar & Andrzej Tomczewski, 2020. "Effect of Moisture on the Thermal Conductivity of Cellulose and Aramid Paper Impregnated with Various Dielectric Liquids," Energies, MDPI, vol. 13(17), pages 1-17, August.
    7. Janvier Sylvestre N’cho & Issouf Fofana & Yazid Hadjadj & Abderrahmane Beroual, 2016. "Review of Physicochemical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers," Energies, MDPI, vol. 9(5), pages 1-29, May.
    8. Pawel Rozga & Abderrahmane Beroual & Piotr Przybylek & Maciej Jaroszewski & Konrad Strzelecki, 2020. "A Review on Synthetic Ester Liquids for Transformer Applications," Energies, MDPI, vol. 13(23), pages 1-33, December.
    9. Maciej Zdanowski, 2020. "Streaming Electrification Phenomenon of Electrical Insulating Oils for Power Transformers," Energies, MDPI, vol. 13(12), pages 1-12, June.
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    Cited by:

    1. Arputhasamy Joseph Amalanathan & Ramanujam Sarathi & Maciej Zdanowski, 2023. "A Critical Overview of the Impact of Nanoparticles in Ester Fluid for Power Transformers," Energies, MDPI, vol. 16(9), pages 1-24, April.
    2. Arputhasamy Joseph Amalanathan & Maciej Zdanowski & Ramanujam Sarathi, 2022. "Streaming Electrification of Different Insulating Fluids in Power Transformers," Energies, MDPI, vol. 15(21), pages 1-20, October.

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