Studies of different types of insulating oils and their mixtures as an alternative to mineral oil for cooling power transformers

Rouabeh, Jilani; M'barki, Lotfi; Hammami, A.; Jallouli, Ibrahim; Driss, Ameni

doi:10.1016/j.heliyon.2019.e01159

Cited by 75 publications

(33 citation statements)

References 15 publications

(22 reference statements)

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“…The addition of olive oil up to 15% and of Jatropha oil up to 20% to mineral oil improves the mineral oil's performance. Recently, the dielectric properties and heat-dissipating ability of blends of mineral oil with olive oil and sunflower oil were investigated and the study confirmed the use of mixed oil for non-cold-climate regions [65].…”

Section: B Retrofilling and Miscibilitymentioning

confidence: 91%

Alternative Dielectric Fluids for Transformer Insulation System: Progress, Challenges, and Future Prospects

et al. 2019

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Ester-based dielectric fluids have gained widespread popularity for applications in high voltage apparatus. Synthetic and natural esters have been subjected to research for decades vis-à-vis mineral insulating oils around the world. Although many researchers favor the application of ester fluids, utilities are still uncertain and application of these alternatives remains a challenge. The intent of this survey is to present recent research progress and highlight the state of the art of key aspects that should be emphasized in future research. The contemporary research scenarios pertaining to the performance of ester fluids versus mineral oils, miscibility, and retrofilling of insulating fluids are discussed. In addition, pre-breakdown phenomena, usage of esters in on-load tap changers, environmental and fire resistance properties, and use of esters in cold climates are also discussed. Importantly, challenges and future aspects that should be investigated to improve the existing knowledge of ester dielectric fluids for applications in transformer technology are highlighted.

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Section: B Retrofilling and Miscibilitymentioning

confidence: 91%

Alternative Dielectric Fluids for Transformer Insulation System: Progress, Challenges, and Future Prospects

et al. 2019

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“…Petroleum-based fluids and lubricants are applied as lubricants and dielectric and coolant material in electrical or electronic devices such as power systems (transformers), machinery, and the automotive and biomedical industries, among others [ 4 , 5 , 6 , 7 ]. Paraffinic and naphthenic oils are examples of mediums used for these applications [ 8 ]. Nevertheless, these materials exacerbate environmental issues due to their eco-toxicity, incomplete biodegradability, and highly probable carcinogenic characteristics [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity Performance of 2D h-BN/MoS2/-Hybrid Nanostructures Used on Natural and Synthetic Esters

et al. 2020

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In this paper, the thermal conductivity behavior of synthetic and natural esters reinforced with 2D nanostructures—single hexagonal boron nitride (h-BN), single molybdenum disulfide (MoS2), and hybrid h-BN/MOS2—were studied and compared to each other. As a basis for the synthesis of nanofluids, three biodegradable insulating lubricants were used: FR3TM and VG-100 were used as natural esters and MIDEL 7131 as a synthetic ester. Two-dimensional nanosheets of h-BN, MoS2, and their hybrid nanofillers (50/50 ratio percent) were incorporated into matrix lubricants without surfactants or additives. Nanofluids were prepared at 0.01, 0.05, 0.10, 0.15, and 0.25 weight percent of filler fraction. The experimental results revealed improvements in thermal conductivity in the range of 20–32% at 323 K with the addition of 2D nanostructures, and a synergistic behavior was observed for the hybrid h-BN/MoS2 nanostructures.

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“…In order to ensure the secure operation of a transformer, testing procedures on dielectric quality of transformer oil have been conducted to fulfill the purpose of insulating as well as cooling. 1211 aged oil samples produced results in oil resistivity, dissipation factor, conductivity, viscosity and breakdown voltage [4]. The conducted tests have been realized in accordance with the IEC standard test procedures which are IEC 60156, IEC 60245 and IEC 61125 [4].…”

Section: Introductionmentioning

confidence: 99%

“…1211 aged oil samples produced results in oil resistivity, dissipation factor, conductivity, viscosity and breakdown voltage [4]. The conducted tests have been realized in accordance with the IEC standard test procedures which are IEC 60156, IEC 60245 and IEC 61125 [4]. In order to conduct the tests, insulating oils will be mixed in precise amounts to determine the breakdown voltage and the electrical field intensity of electro-convection.…”

Section: Introductionmentioning

confidence: 99%

Electric field bridging pattern of pre-breakdown and breakdown condition in transformer oil

Mustafa

Ali

Zainuddin

et al. 2020

IJEECS

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Transformer is considered as one of the most important equipment in electrical power system networks. However, most problems occurred in transformer were related to the defects and weakness of the insulation systems. The oils used in transformer act as coolant and insulation purposes hence maintaining the dielectric strength of the transformer. In this work, electric field bridging pattern is observed from pre-breakdown and breakdown condition. The electric field bridging formation was recorded in the experimental setup and images were captured per frame. 193 images were randomly chosen from the whole video frames where 102 images were the pre-breakdown images and 91 images were the breakdown images. This system comprises of four stages: (i) a preprocessing stage to mark the electrodes tips and background subtraction; (ii) a segmentation stage to extract the electric field bridging formation in region of interest; (iii) a feature extraction stage to extract electric field bridging using feature descriptors, area, minor-axis and major-axis length (iv) a classification stage to identify the pre-breakdown and breakdown condition. System performance was evaluated using support vector machine (SVM), k-nearest neighbour (k-NN) and random forest (RF) and SVM provided the most promising accuracy that was 99%. The results show that the combination of three feature descriptors, area, minor-axis and major-axis length are the best features combination in identifying the transformer oil condition. In future work, further studies will be conducted to investigate the pattern of pre- and post-breakdown due to some similarity found in image pattern. Due to that, more feature descriptors will be identified to find a unique pattern between pre- and post-breakdown condition

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Studies of different types of insulating oils and their mixtures as an alternative to mineral oil for cooling power transformers

Cited by 75 publications

References 15 publications

Alternative Dielectric Fluids for Transformer Insulation System: Progress, Challenges, and Future Prospects

Alternative Dielectric Fluids for Transformer Insulation System: Progress, Challenges, and Future Prospects

Thermal Conductivity Performance of 2D h-BN/MoS2/-Hybrid Nanostructures Used on Natural and Synthetic Esters

Electric field bridging pattern of pre-breakdown and breakdown condition in transformer oil

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