Role of Aromatic Hydrocarbons in Sediment Formation in Transformer Oil

Turanova, O. A.; Bikkinyaeva, Yu. K.; Gafiyatullin, L. G.; Гнездилов, О. И.; Козлов, В. К.; Туранов, А. Н.

doi:10.1007/s10553-014-0478-4

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…The marked change of structure-group distribution involves an increase in the amount of protons from aromatic hydrocarbons and a decrease in the amount of protons from methyl groups and naphthene hydrocarbons. The fact that the amount of aromatic compounds is larger in the used oils agrees well with the results from investigation of the role of aromatic compounds in the formation of deposits in transformer oil [6]. The presence of a weak absorption band at 1747 cm -1 in the IR spectrum of the used oil ( Fig.…”

supporting

confidence: 88%

“…The oxidation and mechanochemical transformation processes take place simultaneously. In work on the instability of the working characteristics of turbine [5] and transformer [6] oils it was shown that deterioration of their quality is determined to a significant degree by the formation of aromatic hydrocarbons and not oxidation products. At the same time ignorance of the true reasons for the aging of oils hampers the choice of stabilizing additives, the analysis and control of degradation of the oils [7,8], and the development of methods for the regeneration of oily waste products.…”

mentioning

confidence: 99%

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Formation of Resins in Used Oils as a Result of Conformation-Structure Change of Their Hydrocarbons

Dmitrieva

2015

Chem Technol Fuels Oils

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The mechanism of formation of resinous compounds during use of industrial and motor oils was studied by IR and NMR spectroscopy. Based on a comparative analysis of the spectra of samples of the used oil and the resins separated from it and the spectrum of fresh oil it was concluded that, besides oxidative mechanism, resinous compounds are formed in the oils as a result of oligomerization of the hydrocarbons. The molecules of the latter suffer, in the thermomechanical deformation process, profound stereostructural change at the level of distortion of the torsion angles and bond lengths. This leads to increase of the potential energy, corresponding dissociation of the R-C···H bonds in the hydrocarbons, and increase of their acidity, which stimulates oligomerization at these protonated bonds, i.e., initiates the oligomerization process and formation of aromatic hydrocarbons, or aging of the oil. The distortion of the stereostructure of the hydrocarbons in the oil during use remains in the mechanochemical memory of the molecules. This is why the purified used oil, even w i t h o u t o x i d a t i o n o f t h e h y d ro c a r b o n s , b e c o m e s d a r k d u r i n g s t o r a g e b e c a u s e o f t h e chromophoric -C-H acids that are formed. The latter are neutralized in the presence of alkaline reagents.

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supporting

confidence: 88%

mentioning

confidence: 99%

Formation of Resins in Used Oils as a Result of Conformation-Structure Change of Their Hydrocarbons

Dmitrieva

2015

Chem Technol Fuels Oils

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“…To get this sensitivity, a good fluid circulation and homogenization of the mixture was required. In this case, the most accurate model adjustment was a model of gain from water concentration, as shown in (7) A…”

Section: Distilled Water Contaminated With Salt Experimental Testsmentioning

confidence: 99%

“…This oxidation causes an increase in its viscosity [5]. It can even generate sediments [6,7], with the obvious damage the sediments can cause as they are deposited on duct walls or interact with the fluid.…”

Section: Introductionmentioning

confidence: 99%

Fluid Degradation Measurement Based on a Dual Coil Frequency Response Analysis

Sánchez‐Palencia

Castilla

Sánchez-Fernández

et al. 2020

Sensors

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Electrical industry uses oils for cooling and insulation of several machines, such as power transformers. In addition, it uses water for cooling some synchronous generators. To avoid malfunctions in these assets, fluid quality should be preserved. To contribute to this aim, a sensor that detects changes in fluid composition is presented. The designed sensor is like a single-phase transformer whose magnetic core is the fluid whose properties will be measured. The response of this device to a frequency sweep is recorded. Through a comparison between any measurement and a reference one corresponding to a healthy state, pollutants presence, such as water in oil or salt in water, can be measured. The performance of the sensor was analyzed through simulation. In addition, a prototype was built and tested measuring water concentration in oil and salt content in water. The correlation between pollutant concentration measured with the sensor and known pollutant concentrations is good.

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“…Hydrocarbons of the naphthenic-aromatic group are usually oxidized quite actively, forming a number of products, including resins. At the same time, an increased amount of resin leads to the formation of acidic products in oil, asphaltenes and carbenes [14,15].…”

Section: Introductionmentioning

confidence: 99%

Determination of the true water content, the nature of the impurities and their concentration in transformer oil

2019

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During the operation of transformers, the insulating oil is aging, therefore, there is the deterioration of its insulating properties, which is determined by multiple physico-chemical processes. The most dangerous factor, from the point of view of preserving the operational reliability and resource of a power transformer, is the moisture content of the insulation. Most methods for determining moisture content have measurement errors. These errors are largely dependent on impurities that are contained in the oil. The modified Fisher method proposed in the article allows determining the amount of impurities in the oil and the absolute moisture content. Conducted research allows also to determine the composition of impurities, to reveal the relationship between impurities and some parameters of transformer oil.

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Role of Aromatic Hydrocarbons in Sediment Formation in Transformer Oil

Cited by 6 publications

References 2 publications

Formation of Resins in Used Oils as a Result of Conformation-Structure Change of Their Hydrocarbons

Formation of Resins in Used Oils as a Result of Conformation-Structure Change of Their Hydrocarbons

Fluid Degradation Measurement Based on a Dual Coil Frequency Response Analysis

Determination of the true water content, the nature of the impurities and their concentration in transformer oil

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