التفاصيل البيبلوغرافية
| العنوان: |
Effective ionization coefficient of C5 perfluorinated ketone and its mixtures with air. |
| المؤلفون: |
Märt Aints, Indrek Jõgi, Matti Laan, Peeter Paris, Jüri Raud |
| المصدر: |
Journal of Physics D: Applied Physics; 4/4/2018, Vol. 51 Issue 13, p1-1, 1p |
| مصطلحات موضوعية: |
IONIZATION constants, KETONE derivatives, ELECTRIC field strength, ATMOSPHERIC pressure measurement, DENSITY functional theory |
| مستخلص: |
C5 perfluorinated ketone (C5 PFK with UIPAC chemical name 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone and sold by 3M as Novec™ 5110) has a high dielectric strength and a low global warming potential, which makes it interesting as an insulating gas in medium and high-voltage applications. The study was carried out to determine the effective Townsend ionization coefficient αeff as a function of electric field strength and gas density for C5 PFK and for its mixtures with air. The non-self-sustained Townsend discharge between parallel plate electrodes was initiated by illuminating the cathode by UV radiation. The discharge current, I, was measured as a function of inter-electrode distance, d, at different gas densities, N, and electric field strengths, E. The effective ionization coefficient αeff was determined from the semi-logarithmic plots of I/I0 against d. For each tested gas mixture, the density normalized effective ionization coefficient αeff/N was found to be a unique function of reduced electric field strength E/N. The measurements were carried out in the absolute pressure range of 0.05–1.3 bar and E/N range of 150–1200 Td. The increasing fraction of C5 PFK in air resulted in the decrease of effective ionization coefficient. The limiting electric field strength (E/N)lim where the effective ionization coefficient αeff became zero was 770 Td (190 kV cm−1 at 1 bar) for pure C5 PFK and decreased to 225 Td (78 kV cm−1 at 1.4 bar) for 7.6% C5 PFK/air mixture. The latter value of (E/N)lim is still more than two times higher than the (E/N)lim value of synthetic air and about two-thirds of the value corresponding to pure SF6. The investigated gas mixtures have the potential to become an alternative to SF6 in numerous high- and medium-voltage applications. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Physics D: Applied Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Full Text Finder