Ester-based Dielectric Fluid for Power Transformers: Design and Test Experience under the GreenEst Project

Ester-based dielectric fluids have now been on the market for several decades, providing fire-safe and environmentally friendly alternatives to mineral oils, which have traditionally been used in transformers and other electrical equipment. This opens the door to innovation in power transformers. Ho...

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Bibliographic Details
Published in:Journal of physics. Conference series 2022-03, Vol.2213 (1), p.12026
Main Authors: Carvalhosa, Salvador, Leite, Helder, Soares, Mário, Branco, Fábio, Sá, Carlos A., Lopes, Ricardo Castro, Santo, Joáo Espírito
Format: Article
Language:English
Subjects:
Cooling systems
Destructive testing
Dielectrics
Electric equipment
Electric potential
Electric power distribution
Esters
Heat transfer coefficients
Mechanical tests
Mineral oils
Physics
Rupturing
Transformers
Voltage
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Summary:Ester-based dielectric fluids have now been on the market for several decades, providing fire-safe and environmentally friendly alternatives to mineral oils, which have traditionally been used in transformers and other electrical equipment. This opens the door to innovation in power transformers. However, the use of esters-based dielectrics in power transformers is still very limited, especially for the higher voltage levels. The usage of these esters-based dielectrics in higher voltage power transformers is not yet consensual. this work present results with the use of natural esters in power distribution transformers. Tests carried out on mineral oil and natural ester oil found that the ester-based dielectric can withstand higher voltage thresholds for AC and Impulses tests, mainly within the specs of destructive tests, e.g., the natural ester was able to withstand a 185kV impulse without registering dielectric rupture while the natural oil registered a dielectric rupture with a 160kV impulse. Heating and mechanical tests demonstrated that ester-based dielectric oils for power transformers lead to a flow reduction between 16,8% and 18,2% in the cooling system that was design for mineral oils but they achieve a higher heat transfer coefficient, between 0,5% to 5% depending on the location of measurement.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2213/1/012026