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Open AccessArticle

Environment-Friendly and Efficient Gaseous Insulator as a Potential Alternative to SF6

1
Department of Electrical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan
2
Faculty of Electrical Engineering, GIK Institute of Engineering Sciences and Technology, Topi 23640, Pakistan
*
Authors to whom correspondence should be addressed.
Processes 2019, 7(10), 740; https://doi.org/10.3390/pr7100740
Received: 29 August 2019 / Revised: 19 September 2019 / Accepted: 8 October 2019 / Published: 14 October 2019
(This article belongs to the Special Issue Green Sustainable Chemical Processes)
Sulfur hexafluoride (SF6) is commonly used in electrical insulation networks due to its superior dielectric properties. However, it possesses a high Global Warming Potential (GWP) of 22,800 times compared to CO2 (at equal mass over a time span of 100 years) and a high atmospheric lifetime. This alarming metric prompted investigation for substitute gases with minor environmental influences. The overall objective of this research is to evaluate refrigerant R152a as a potential alternative for SF6 in electrical insulation systems. R152a gas has a significantly reduced value of GWP (140) and is a cheap insulation medium as compared to SF6. In this paper, dielectric breakdown testing of R152a and a mixture of CO2 with different concentrations have been tested. The dielectric strength of R152a/CO2 gas shows a saturated growth trend with increasing the gap difference, gas pressure and mixing ratio of R152a. Based on our experimental conditions, R152a/CO2 gas reveals good dielectric properties, and insulation performance can reach up to 96% of SF6. Finally, this work will bring a cost-effective and environment-friendly gaseous insulator for utility companies and power equipment manufacturers. View Full-Text
Keywords: R152a/CO2; global warming potential; breakdown characteristics; environment-friendly; insulating material; power frequency R152a/CO2; global warming potential; breakdown characteristics; environment-friendly; insulating material; power frequency
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Kharal, H.S.; Kamran, M.; Ullah, R.; Saleem, M.Z.; Alvi, M.J. Environment-Friendly and Efficient Gaseous Insulator as a Potential Alternative to SF6. Processes 2019, 7, 740.

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