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Streaming Electrification of Nycodiel 1255 Synthetic Ester and Trafo EN Mineral Oil Mixtures by Using Rotating Disc Method

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  • Maciej Zdanowski

    (Faculty of Electrical Engineering, Automatic Control and Informatics, Opole University of Technology, Prószkowska 76, 45-758 Opole, Poland)

Abstract

Power transformers are the main element of an electric power system. The service life of these devices depends to a large extent on the technical condition of their insulation system. Replacing mineral oils with natural or synthetic ester (retrofilling process) may increase the efficiency and operational safety of transformers, and also limit their adverse environmental impact. It is technically unfeasible to completely remove mineral oil from a transformer. Its small residues form a mixture with fluid ester, with different physicochemical and electric properties. Streaming electrification is one of the phenomena which, under unfavorable conditions, may damage the insulation system of a forced oil cooled transformer. It is necessary to run prophylactic tests for the ECT (electrostatic charging tendency) of insulating liquid mixtures from the point of view of transformer retrofilling, which is being used more often than before. The article presents the results of studies on selected physicochemical, and electrical properties, and the ECT of mixtures of fresh and aged Trafo EN mineral oil with Nycodiel 1255 synthetic ester. In this regard, the density, the kinematic viscosity, the conductivity, and the relative dielectric constant were measured. The molecular diffusion coefficient was determined using Adamczewski’s empirical dependency. The streaming electrification was tested in a rotating disc system. The impact of the rotation time, the diameter, and the disc’s rotation speed on the amount of the electrification current generated were analyzed. In addition, the co-relation between the electrification current and the composition of the mixture was determined using fresh and aged mineral oil. On the basis of the electrification model, the volume density of the q w charge was calculated, which is a parameter defining the ECT of insulating liquids. Based on the results, it was concluded that the synthetic ester is characterized by a higher susceptibility to electrification than the mineral oil. However, combining synthetic ester with a small amount (up to 20%) of fresh or aged mineral oil significantly reduces its ECT, which is beneficial from the point of view of retrofilling power transformers.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:23:p:6159-:d:450092
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    References listed on IDEAS

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    1. Jiangjun Ruan & Shuo Jin & Zhiye Du & Yiming Xie & Lin Zhu & Yu Tian & Ruohan Gong & Guannan Li & Min Xiong, 2017. "Condition Assessment of Paper Insulation in Oil-Immersed Power Transformers Based on the Iterative Inversion of Resistivity," Energies, MDPI, vol. 10(4), pages 1-15, April.
    2. 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.
    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. Stefan Wolny, 2019. "Analysis of High-Frequency Dispersion Characteristics of Capacitance and Loss Factor of Aramid Paper Impregnated with Various Dielectric Liquids," Energies, MDPI, vol. 12(6), pages 1-10, March.
    5. Abderrahmane Beroual & Usama Khaled & Phanuel Seraphine Mbolo Noah & Henry Sitorus, 2017. "Comparative Study of Breakdown Voltage of Mineral, Synthetic and Natural Oils and Based Mineral Oil Mixtures under AC and DC Voltages," Energies, MDPI, vol. 10(4), pages 1-17, April.
    6. 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.
    7. 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. Grzegorz Dombek & Jarosław Gielniak, 2023. "Dielectric Properties and Fire Safety of Mineral Oil and Low-Viscosity Natural Ester Mixtures in Various Concentrations," Energies, MDPI, vol. 16(10), pages 1-14, May.
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    4. 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.
    5. 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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