Influence of ultrasonic waves on viscosity of edible natural esters based liquid insulation

Bakrutheen, M.; Iruthayarajan, M. Willjuice; Narayani, A.

doi:10.1109/tdei.2018.006931

Cited by 16 publications

(10 citation statements)

References 40 publications

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“…The impact of esterification on the properties of Jatropha curcas oil is also discussed and it was observed that, after esterification (alkali base catalyzed), this oil could also be a substitute for mineral oils. Similarly, performance analyses of Karanja oil [34], edible oils [35], [36], camellia and rapeseed oils [37], and waste vegetable oil [38] have been reported recently, and the superiority of vegetable oils over mineral oils and their feasibility for use in transformers were highlighted. Condition monitoring information of in-service vegetable oils is important information to industry and a real-time monitoring history for a service period of 10 years with vegetable-oilfilled transformers is documented in [39].…”

Section: A Performance Of Ester Fluids: Recent Progressmentioning

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: A Performance Of Ester Fluids: Recent Progressmentioning

confidence: 91%

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

et al. 2019

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“…The NEs rich in UFAs do not contain H molecules in the fatty acid chain and thus no production of sulfur oxides, reducing the risk of deterioration of solid insulation. With regards to viscosity, NEs with high SFAs have an H molecule between every Carbon-Carbon (C-C) chain and it is difficult to alleviate the (C-C) length unless using any ultrasonic wave treatment [20] [21]. But the effect could be short-term so that the (C-C) length begins to shrink as the viscosity matrix is rigid to restore to its initial length.…”

Section: A Unsaturated Fatty Acids (Ufas) Rich Natural Esters (Ne)mentioning

confidence: 99%

“…The UFAs rich NEs are initially treated with Activated Bentonite Clay for the removal of moisture/ionic impurities followed by heating at 100°C [35]. Then, the ultrasonic waves with 30kHz at 90°C are used to alter the molecular structure of the oil, which affects the viscosity of oil [21]. The UFAs rich oils are a loosely packed chain structure without a hydrogen molecule which when subjected to ultrasonic waves, the oil experiences compression and expansion forces acting between the carbon atoms.…”

Section: Superior Insulating Fluid (Sif)mentioning

confidence: 99%

Comparison of Ageing Characteristics of Superior Insulating Fluids With Mineral Oil for Power Transformer Application

et al. 2020

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Natural Esters (NEs) with a high proportion of Unsaturated Fatty Acids (UFAs) were used in this research. A Superior Insulating Fluid (SIF) is prepared by blending NEs like Baobab Oil (BAO) and Mongongo Oil (MGO) with a pure dielectric like Kerosene (KER) and subjected to ultrasonic wave treatment at 30kHz. Then, accelerated heating of SIF is carried out in the presence of Kraft Paper (KP) and Copper Plate (CP) for 10 hours a day at 90°C for 30 successive days. The deterioration of the dielectric characteristics of SIF, KP, and CP was measured as per IEC and ASTM standards before and after the schemes of stressing. The failure rate of SIF, KP and CP was compared to understand the influence of KER in NEs. The KER addition at 5% proportion protects the oil from dielectric weakening, copper from ageing and likewise, the viscosity remains at the original level. The use of KER in NEs have thin the oils and protects the copper from oxidation, thus preserving the quality of oils for several years. The extrapolation of data is done using a polynomial function and for 90 days, where the selected SIFs show 7% of ageing rate when compared to MO that shows 50% ageing rate. This affirms that SIFs are a suitable substitute for Mineral Oil (MO) and reclamation SIFs are achieved using natural reclamation/filtration techniques using Activated Bentonite and Activated Carbon. Hence spilling and reusing the SIFs does not harm the environment as that of Mineral Oil (MO).

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“… [1] , [2] , [3] . As an extension of ultrasonic technology, in the field of high voltage insulation for power transformers, the ultrasonic treatment techniques are employed for reducing the viscosity of vegetable oil based natural esters [4] .…”

Section: Introductionmentioning

confidence: 99%

“…Ultrasonic treatment is carried out to different power level and frequency range of ultrasonic wave. This approach is also used in viscosity reduction of heavy oil and vegetable oil based natural esters [4] , [13] .…”

Section: Introductionmentioning

confidence: 99%

Impact of ultrasonic treatment process on pour point of vegetable oils based liquid insulation

Moosasait

Siluvairaj

2021

Ultrasonics Sonochemistry

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Influence of ultrasonic waves on viscosity of edible natural esters based liquid insulation

Cited by 16 publications

References 40 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

Comparison of Ageing Characteristics of Superior Insulating Fluids With Mineral Oil for Power Transformer Application

Impact of ultrasonic treatment process on pour point of vegetable oils based liquid insulation

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