Methods for monitoring the chemical stability of insulating liquids

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Abstract

This article proposes a method for optimizing the properties of transformer oil (aromatic, paraffin, naphthenic) to stabilize the sedimentation process by mixing the oil with a synthetic ester in a certain ratio. To control changes in the properties of the oil and mixtures, accelerated aging was carried out under conditions close to real ones during the operation of insulating liquid in high-voltage transformers. During the aging process, the chemical stability of the oil, ester liquid, and their mixtures was assessed using optical methods. The stability of insulating liquids was monitored using indicators such as optical turbidity, the number of mechanical particles by fraction, contamination index and the relative content of decomposition products dissolved in liquids. It is shown that these indicators can serve as effective indicators of the process of colloid and sedimentation in a liquid dielectric at the initial stage and can be used for the purpose of preventive diagnostics of the insulation of high-voltage equipment.

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About the authors

Marina N. Lyutikova

Branch of PJSC Rosseti – Yamalo-Nenets PMES; Federal State Budgetary Educational Institution of Higher Education Novosibirsk State Technical University

Author for correspondence.
Email: m.lyutikova@mail.ru
ORCID iD: 0000-0002-0824-9025

PhD in Chemistry, Leading Chemical Engineer – Head of the Laboratory of the Branch of PJSC Rosseti – Yamalo-Nenets PMES; Associate Professor of the Occupational Safety Department, Federal State Budgetary Educational Institution of Higher Education Novosibirsk State Technical University

Research interests: diagnostics of the insulation condition of high-voltage equipment using physical and chemical control methods

Russian Federation, Noyabrsk; Novosibirsk

Aleksandr V. Ridel

Federal State Budgetary Educational Institution of Higher Education “Novosibirsk State Technical University”

Email: ridel@corp.nstu.ru
ORCID iD: 0000-0002-5385-2237

Candidate of Technical Sciences, Senior Researcher, Department of Occupational Safety

Research interests: study of physical processes occurring in the insulation of high-voltage equipment

Russian Federation, Novosibirsk

Marsel S. Garifullin

Kazan State Power Engineering University

Email: g_marsels@mail.ru
ORCID iD: 0000-0001-6026-9923

Doctor of Technical Sciences, Professor of the Department of Electric Power Systems and Networks

Research interests: diagnostics of the insulation condition of high-voltage equipment using spectral methods

Russian Federation, Kazan

Yulia N. Slobodina

Parallax Povolzhye LLC

Email: yulya_slobodina@mail.ru

Master of Engineering and Technology, 1st category design engineer

Research interests: diagnostics of the insulation condition of high-voltage equipment using spectral methods

Russian Federation, Naberezhnye Chelny

References

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Supplementary files

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2. Fig. 1. Basic requirements for dielectric liquids (EO – electrical equipment; IL – insulating liquids)

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3. Fig. 2. Appearance of oil before and after prolonged thermal aging and the resulting sediments

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4. Fig. 3. Appearance of essential oil mixtures after prolonged thermal aging

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5. Fig. 4. The value of optical turbidity of oil and essential oil mixtures after prolonged thermal aging

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6. Fig. 5. Pollution indices of dielectric liquids before and after aging

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7. Fig. 6. UV spectra of dielectric liquids after prolonged thermal aging: a – TKp; b – GK; c – Nytro 11GX

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Copyright (c) 2024 Lyutikova M.N., Ridel A.V., Garifullin M.S., Slobodina Y.N.