Investigation of Gas Formation in>Dielectric Liquids

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Abstract

Monitoring the formation of gases in liquid dielectrics during their operation in high-voltage transformers is of great practical importance in diagnosing the condition of the internal insulation of oil-filled equipment. The composition of the gas mixture and the dynamics of the growth of concentrations of certain gases can provide valuable information about the appearance and possible nature of a defect inside the equipment. The available methods for determining gases are designed to monitor the condition of electrical equipment filled with petroleum-based transformer oil. Meanwhile, the global power industry is gradually moving to alternative fluids such as natural and synthetic esters, as well as mixtures of these esters with transformer oil. Ester dielectric fluids are highly biodegradable, fire retardant, highly water soluble without compromising electrical insulating properties, and are environmentally friendly and renewable. Accordingly, their use in high-voltage equipment requires the development of control methods. The paper presents the results of a study of the formation of gases under the influence of discharge processes in a synthetic ester liquid, as well as mixtures of transformer oil with an ether content of 5% to 30% by volume. The determination of gases dissolved in liquids was carried out on a gas chromatograph according to a new method.

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About the authors

M. N. Lyutikova

Новосибирский государственный технический университет

Author for correspondence.
Email: m.lyutikova@mail.ru

к. х. н.

Russian Federation, Новосибирск

A. V. Ridel

Новосибирский государственный технический университет

Email: m.lyutikova@mail.ru

к. т. н.

Russian Federation, Новосибирск

S. I. Sotnikov

Филиал ПАО «Россети» – Ямало-Ненецкое ПМЭС

Email: m.lyutikova@mail.ru
Russian Federation, Ноябрьск

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Supplementary files

Supplementary Files
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2. Fig.1. Example of the chemical structure of a synthetic ester molecule (pentaerythritol and carboxylic acids)

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3. Fig.2. Selection of liquid dielectric for chromatographic analysis

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4. Fig.3. Chromatogram of gases identified in the equilibrium vapor-gas phase above a dielectric liquid (stylized)

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5. Fig.4. Formation of hydrogen (H2) in liquids before and after discharge processes

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6. Fig.5. Formation of hydrocarbon gases (HCG) in liquids before and after discharge processes

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7. Fig.6. Formation of carbon monoxide (CO) in liquids before and after discharge processes

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8. Fig.7. Formation of carbon dioxide (CO2) in liquids before and after discharge processes

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Copyright (c) 2024 Lyutikova M.N., Ridel A.V., Sotnikov S.I.

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