Dissolved gas analysis differences between natural esters and mineral oils used in power transformers: a review

Meira, Matias; Ruschetti, Cristian; Álvarez, Raúl Emilio; Catalano, Leonardo J.; Verucchi, Carlos

doi:10.1049/iet-gtd.2018.6318

Cited by 20 publications

(7 citation statements)

References 38 publications

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“…Using the data of these gases dissolved in oil, it is possible to determine the technical condition of the PT and the type of primary defect by the DGA method. There are also various interpretations and standards for the DGA method, such as the duval triangle, the duval pentagon, the IEC ratio, the key gas criterion, the Dornenburg ratio, and the Rogers ratio [8]- [12].…”

Section: Introductionmentioning

confidence: 99%

Predicting the technical condition of the power transformer using fuzzy logic and dissolved gas analysis method

Levin

Yahya

Boyarova

2022

IJECE

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Power transformers are one of the most important and complex parts of an electric power system. Maintenance is performed for this responsible part based on the technical condition of the transformer using a predictive approach. The technical condition of the power transformer can be diagnosed using a range of different diagnostic methods, for example, analysis of dissolved gases (DGA), partial discharge monitoring, vibration monitoring, and moisture monitoring. In this paper, the authors present a digital model for predicting the technical condition of a power transformer and determining the type of defect and its cause in the event of defect detection. The predictive digital model is developed using the programming environment in LabVIEW and is based on the fuzzy logic approach to the DGA method, interpreted by the key gas method and the Dornenburg ratio method. The developed digital model is verified on a set of 110 kV and 220 kV transformers of one of the sections of the distribution network and thermal power plant in the Russian Federation. The results obtained showed its high efficiency in predicting faults and the possibility of using it as an effective computing tool to facilitate the work of the operating personnel of power enterprises.

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Section: Introductionmentioning

confidence: 99%

Predicting the technical condition of the power transformer using fuzzy logic and dissolved gas analysis method

Levin

Yahya

Boyarova

2022

IJECE

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“…Therefore, researchers need to find new substitutes for insulating oil [3]. Vegetable oil is 95-100% biodegradable, non-toxic and environmentally friendly, so it has almost no harm to environment [4][5]. However, the presence of unsaturated fatty acids in vegetable oil is prone to aging.…”

Section: Introductionmentioning

confidence: 99%

Micro-mechanism study on different antioxidants protective effect of vegetable oil by ReaxFF molecular dynamics

Cong

Pan

et al. 2021

CSEE JPES

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The aging problem of vegetable oil has severely restricted the popularization and application of vegetable oil transformers. Adding antioxidants is the most recommended solution. At present, there is insufficient research on the micro-mechanism of the protective effect of antioxidants on vegetable oil. In this paper, multiple vegetable oil models with different types and concentrations of antioxidants were established. Then the molecular dynamics simulation based on ReaxFF was carried out at different temperatures and oxygen content. Results show that the protective mechanism of antioxidants is to release H and combine with free radicals generated by the decomposition of unsaturated fatty acids (UFA) in the oil. In addition, the protective effects of four antioxidants are different. The stronger ones are tert-butyl hydroquinone (TBHQ) and butylated hydroxytoluene (BHT), while the weaker ones are butylated hydroxyanisole (BHA) and propyl gallate (PG). TBHQ has a better protective effect at low concentration, but the decomposition of UFA is promoted at high concentration. When the temperature rises, the decomposition of UFA would be promoted. With the addition of oxygen, small molecular compounds are easily oxidized, and the decomposition of UFA is accelerated. The above research could reveal the microscopic mechanism of antioxidant protection on vegetable oil, providing theoretical reference for further exploration of effective vegetable oil aging protection technology.

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“…For efficient operation of transformers, mineral oil is used to provide insulation and perform cooling. Currently, most power transformers use solid insulation (paper) with the combination of a liquid element (oil) to make up its insulating system [1]. Whilst mineral oils are exploited for their improved thermal and dielectric properties.…”

Section: Introductionmentioning

confidence: 99%

“…There are also process characteristics of these alternatives to mineral oil, such as the temperature of inflammation for vegetable oils is significantly higher, which is a significant advantage for applications as fire risk is far greater (such as indoors, in urban areas, or railway transformers) [1]. Further, the transformer's lifecycle is highly dependent on its dielectric insulation problems.…”

Section: Introductionmentioning

confidence: 99%

Multi-aging Effects on Vegetable Based Oils for Transformer Insulation in HV Systems

Khan

Abid

Ullah

et al. 2021

J. Electr. Eng. Technol.

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Liquid insulation media is used for insulation and cooling purpose inside the transformer. Currently, transformers are using petroleum based mineral oil, which poses a serious hazardous environmental impact, since the mineral oil is non-renewable and non-biodegradable. Although, the increased cost and depleting nature of mineral oil cause an emergent need to use suitable alternatives to mineral oils that are biodegradable and environmentally friendly. In response to this resource issue, various vegetable oils, namely Sunflower oil, Soya bean oil, and a blend of Sunflower and Olive (BSO) oil are suitable alternatives for transformer insulation in high voltage systems. The afore-mentioned vegetable oils are subjected to multi-aging and comparative analysis is performed with mineral oil. Further, the dielectric and thermal properties of vegetable oils are tested before and after aging. Fourier Transform Infrared spectroscopy, water content, breakdown voltage, viscosity, flash point, tan delta, and pour point tests are performed on vegetable oils before and after aging. Finally, a comparative analysis of vegetable oils with mineral oil is provided to prove the efficacy of the proposed vegetable oils. The BSO oil resulted in higher breakdown strength and good thermal behavior when subjected to the abovementioned various diagnostic measurement tests in comparison to other oils.

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Dissolved gas analysis differences between natural esters and mineral oils used in power transformers: a review

Cited by 20 publications

References 38 publications

Predicting the technical condition of the power transformer using fuzzy logic and dissolved gas analysis method

Predicting the technical condition of the power transformer using fuzzy logic and dissolved gas analysis method

Micro-mechanism study on different antioxidants protective effect of vegetable oil by ReaxFF molecular dynamics

Multi-aging Effects on Vegetable Based Oils for Transformer Insulation in HV Systems

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