Investigation on dielectric properties of chlorodifluoromethane and mixture with other N 2 /CO 2 /air as a promising sub
- PDF / 2,291,374 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 51 Downloads / 156 Views
ORIGINAL PAPER
Investigation on dielectric properties of chlorodifluoromethane and mixture with other N2/CO2/air as a promising substitute to SF6 in high voltage application Muhammad Zaheer Saleem1 · Muhammad Kamran1 · Salman Amin2 · Rahmat Ullah3 Received: 9 November 2019 / Accepted: 4 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Sulphur hexafluoride ( SF6) has been the most commonly used gas in the electrical industry since 1960s. Due to the high environmental hazards reported by using S F6, the research on to investigate alternative gaseous insulation has become demanding research in high voltage engineering. The refrigerant gas chlorodifluoromethane (CHClF2) with low global warming potential and stable chemical properties possess high dielectric strength due to the presence of fluorine atoms. In this paper, the dielectric strength of CHClF2 and its mixtures with CO2, N2, and Air in the uniform field are investigated under AC, DC and impulse voltage. Buffer gases ( CO2, N2, and Air) are added to improve the boiling point of base gas ( CHClF2). The dielectric strength increase has also been reported by mixing base gas with N 2. Moreover, the synergistic effect, liquefaction temperature, and self-recoverability test were also obtained proving the significance of the research. Keywords CHClF2 gas mixtures · Dielectric breakdown · Global warming potential · Gas insulation · SF6 alternatives
1 Introduction In 1937, French firstly used Sulphur hexafluoride as an insulating medium for high-voltage electrical equipment’s. Due to a strong electronegative property of S F6, it has an affinity to attract free electrons formed by ionization of atoms during arcing. SF6 has been extensively used in gasinsulated switchgear (GIS), gas-insulated lines (GIL) and * Muhammad Zaheer Saleem [email protected] Muhammad Kamran [email protected] Salman Amin [email protected] Rahmat Ullah [email protected] 1
Department of Electrical Engineering, University of Engineering and Technology, Lahore, Pakistan
2
Department of Electrical Engineering, University of Engineering and Technology, Taxila, Pakistan
3
Department of Electrical Engineering, Ghulam Ishaq Khan Institute of Engineering Sciences & Technology, Swabi, Pakistan
gas-insulated transformers (GIT) [1]. However, due to environmental hazards of SF6 such as GWP of 23,500 times to CO2, high atmospheric lifetime (3200) years and chemical stability to decompose it has been restricted by Kyoto protocol and to eliminate its use by 2020 [2, 3]. Up to date, no alternative gaseous insulator was discovered that has excellent insulation, interruption and environment-friendly properties. In 1970, measurements of greenhouse SF6 gas were 0.03 parts per trillion by volume (pptv) but in 1992 this value has increased to 2.8 pptv which is double of the global mean value. Depending on the assumptions of release rates, SF6 concentration in the atmosphere could reach 65 pptv by the year 2100 [4, 5]. The chan
Data Loading...
