Investigation and Analysis of Electro-physical Properties of Biodegradable Vegetable Oil for Insulation and Cooling Application in Transformers

  • Ashish Kumar KarmakerEmail author
  • Md. Mamun Sikder
  • Mohammad Jakir Hossain
  • Md. Raju Ahmed


This paper focuses on the use of alternative insulating oil due to the lack of petroleum resources and concern about the environmental issues. For these purposes, a few vegetable oils available in Bangladesh are investigated for their electrical and physical properties. Vegetable oils are environmentally friendly because of their high biodegradability, low toxicity, high flash points and lower inflammability. This paper demonstrates the kinematic viscosities of sunflower oil, til oil and pithraj oil, which are found as 22.48 mm2/s, 24.81 mm2/s and 29.84 mm2/s, respectively at 20°C. The electrical breakdown voltage obtained for sunflower oil, til oil and pithraj oil are found to be 18.53 kV, 16.17 kV and 15.03 kV, respectively, for a 2.5-mm gap between electrodes at 20°C. The statistical analysis of the breakdown voltage of the vegetable oils is conducted in this paper using ‘R’ software. Finally, the experimental results are compared with mineral oil, which is generally used in distribution transformers.

Graphic Abstract


Dielectric strength kinematic viscosity thermal conductivity breakdown voltage statistical analysis normal distribution 


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Conflict of interest

The authors affirm that there is no conflict of interest regarding publishing the paper.


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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Department of Electrical and Electronic EngineeringDhaka University of Engineering and TechnologyGazipurBangladesh

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