Visual Determination of Transformer Oil Quality Parameters

During operation of the transformer, the oil in it undergoes profound changes usually referred to as aging. The electrical insulating properties of it deteriorate, and sediments accumulate on the active part, which makes it difficult to remove heat. Inhomogeneous solid formations can induce not only the voltage breakdown, but also impair the parameters such as viscosity and other char-acteristics of the oil, which are important for the reliable operation of the power transformers. Aromatic groups initially is present in the transformer oil composition during the operation of the oil, and because of the aging processes, the concentration of the unsaturated cyclic com-pounds increases. The aim of this work is to develop a new method for the determination of the aromatic compounds and colloidal particles. This goal is achieved using a visual inspection of the transformer oil samples in the visible range. The most significant result of the paper is the establishment of a correlation between the acid number of the transformer oil (KOH), the tan-gent of the dielectric loss angle and the type of oil image under the visible light illumination. The significance of the obtained results lies in the fact that the presented method based on the analy-sis of the scattered and transmitted radiation, makes it possible to determine the presence of the aromatic compounds and colloidal particles in the transformer oil, as well as to define their con-centration and size. This method simplifies the analysis of the transformer oil quality, and re-duces the cost of the research, which is an important factor for the electric power industry.

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Diagnostics of the technical condition of transformers according to the color characteristics of transformer oil

E3S Web of Conferences ◽

10.1051/e3sconf/201912405001 ◽

2019 ◽

Vol 124 ◽

pp. 05001

Author(s):

D.M. Valiullina ◽

Yu.K. Ilyasova ◽

V.K. Kozlov

Keyword(s):

Aromatic Compounds ◽

Optical Radiation ◽

Colloidal Particles ◽

Early Stage ◽

Diagnostic System ◽

Technical Condition ◽

Acid Number ◽

Transformer Oil ◽

Stage Of Development ◽

Initial Stage

This paper presents the results of a research of transformer oil in a visual way. The high information content of the optical radiation scattered and transmitted through the oil is shown. By the color of the radiation, it is possible to determine such characteristics of the oil as acid number, dielectric loss tangent, the presence of colloidal particles, their concentration and size, as well as the presence of aromatic compounds in the oil, changes in their molecular composition and concentration. By the presence of aromatic compounds and colloidal particles, it is possible to visually state the development of thermal and discharge defects in a transformer. This diagnostic system allows to assess the condition of power transformers without shutting them down, make decisions on their further operation without the use of expensive equipment and at the initial stage to identify the changes that are significant and necessary. This is due to the high cost of the transformer, its importance in terms of the reliability of power supply to consumers, the complexity of determining damages and defects at an early stage of development.

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METHOD FOR EXPERIMENTAL DETERMINATION OF THE LIQUID DIELECTRIC RESOURCE AND MEASURES FOR ITS RESTORATION

Kontrol Diagnostika ◽

10.14489/td.2019.08.pp.036-041 ◽

2019 ◽

pp. 36-41

Author(s):

S. P. Vysogorets ◽

A. N. Nazarychev ◽

A. A. Pugechov

Keyword(s):

Experimental Determination ◽

Oil Quality ◽

Technical Problem ◽

Transformer Oil ◽

Quality Stability ◽

Transformer Oils ◽

Resource Characteristics ◽

Theoretical Foundations

The theoretical foundations of changes in the transformer oil quality characteristics, depending on the aging degree, are presented. The introduction of a new indicator of the exploitational transformer oils quality – “stability against oxidation” – is substantiated as a way of solving the scientific and technical problem of assessing the resource characteristics of a transformer insulating system. In order to select the best measures to maintain the quality of power transformers insulating oils, a newly developed “Method for the Experimental Determination of the Luquid Dielectric Resource and Measures for its Restoration” is presented.

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Determination of transformer oil quality by the acoustic method

MATEC Web of Conferences ◽

10.1051/matecconf/201711301008 ◽

2017 ◽

Vol 113 ◽

pp. 01008 ◽

Cited By ~ 3

Author(s):

Anastasiya Tyuryumina ◽

Andrey Batrak ◽

Victor Sekackiy

Keyword(s):

Oil Quality ◽

Acoustic Method ◽

Transformer Oil

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DGA Method Based on Fuzzy for Determination of Transformer Oil Quality

Proceedings of International Conference on Smart Computing and Cyber Security - Lecture Notes in Networks and Systems ◽

10.1007/978-981-15-7990-5_11 ◽

2020 ◽

pp. 119-126

Author(s):

Obhi Thiessaputra ◽

Muhamad Haddin ◽

Sri Arttini Dwi Prasetyowati

Keyword(s):

Oil Quality ◽

Transformer Oil

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Determination of Moisture Content of Insulating Oils by CoCl2

Problems of the Regional Energetics ◽

10.52254/1857-0070.2021.1-49.07 ◽

2021 ◽

Author(s):

Vladimir Kozlov ◽

◽

Olga Turanova ◽

Olga Kurakina ◽

Alexander Turanov ◽

...

Keyword(s):

Moisture Content ◽

Power Systems ◽

Low Cost ◽

High Sensitivity ◽

Transformer Oil ◽

Spectral Studies ◽

Visible Range ◽

Transformer Oils ◽

The Relationship

Moisture content is one of the parameters of transformer oil that determine its quality. This parameter is one of the most critical, which is closely monitored. During the operation of transformer oil in the power equipment of electric power systems, about 10 grams of water per ton of oil is allowed, i.e. the permissible proportion of water is 10 ppm (ppm). The aim of the work is to develop a new method for determining the permissible proportion of water in transformer oil in small quantities. This goal is achieved by performing spectral studies of transformer oil samples in the UV and visible range with the addition of cobalt (II) chloride (CoCl2) powder. Сobalt (II) chloride has the ability to change its color depending on the amount of water of crystallization. The most significant result of the article is the conclusion, obtained on the basis of the recorded spectra, about the relationship between the optical density of the spectrum in the range of 360-490 nm and the moisture content of transformer oil when adding cobalt chloride powder. The significance of the results obtained is that the authors have proposed a new optical method for determining small values of the proportion of water in transformer oils, based on the dependence of the optical properties of cobalt (II) chloride on moisture content.This method has a very high sensitivity, low cost for determining the proportion of water and is very promising for solving problems of power energy.

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Tandem Mass Spectrometric Evaluation of Core Structures of Aromatic Compounds after Catalytic Deoxygenation

10.26434/chemrxiv.5410807.v1 ◽

2017 ◽

Author(s):

Xueming Dong

Keyword(s):

Aromatic Compounds ◽

Supported Catalyst ◽

Mass Spectrometric ◽

Spectrometric Method ◽

Mass Spectrometric Method ◽

Aromatic Rings ◽

Tandem Mass Spectrometric ◽

Catalytic Deoxygenation ◽

Oxygen Atoms

Catalytic deoxygenation of coal enhances the stability and combustion performance of coal-derived liquids. However, determination of the selectivity of removal of oxygen atoms incorporated in or residing outside of aromatic rings is challenging. This limits the ability to evaluate the success of catalytic deoxygenation processes. A mass spectrometric method, in-source collision-activated dissociation (ISCAD), combined with high resolution product ion detection, is demonstrated to allow the determination of whether the oxygen atoms in aromatic compounds reside outside of aromatic rings or are part of the aromatic system, because alkyl chains can be removed from aromatic cores via ISCAD. Application of this method for the analysis of a subbituminous coal treated using a supported catalyst revealed that the catalytic treatment reduced the number of oxygen-containing heteroaromatic rings but not the number of oxygen atoms residing outside the aromatic rings.<br>

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Tandem Mass Spectrometric Evaluation of Core Structures of Aromatic Compounds after Catalytic Deoxygenation

10.26434/chemrxiv.5410807 ◽

2017 ◽

Author(s):

Xueming Dong

Keyword(s):

Aromatic Compounds ◽

Supported Catalyst ◽

Mass Spectrometric ◽

Spectrometric Method ◽

Mass Spectrometric Method ◽

Aromatic Rings ◽

Tandem Mass Spectrometric ◽

Catalytic Deoxygenation ◽

Oxygen Atoms

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Determination of the profile of the temperature field of material heated by continuous laser radiation

Physics and Chemistry of Materials Treatment ◽

10.30791/0015-3214-2020-3-5-10 ◽

2020 ◽

pp. 51-10

Author(s):

B.A. Lapshinov ◽

◽

N.I. Timchenko ◽

Keyword(s):

Temperature Field ◽

Optical Fiber ◽

Prolonged Exposure ◽

Radiation Spectrum ◽

Visible Range ◽

Continuous Laser ◽

Surface Temperature Distribution ◽

Continuous Radiation ◽

Spectral Pyrometry

Spectral pyrometry was used to determine the surface temperature distribution of Si, Nb, Cu, and graphite samples when they were locally heated by continuous radiation of an Nd:YAG laser (λ = 1.064 μm). With prolonged exposure to radiation, a stationary temperature field was established in the samples. The thermal spectra were recorded with a small spectrometer in the visible range in the temperature range above 850 K. The optical fiber used to transmit the radiation spectrum to the spectrometer had an additional diaphragm with a diameter of 1 mm located at a certain distance from the fiber end, which ensured the locality of the recorded spectra. The optical fiber moved continuously along the sample, and the spectrometer recorded up to 100 spectra with a frequency of 5-10 Hz. The temperature profile of the samples was calculated based on the results of processing the spectra using the Spectral Pyrometry program.

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