Electron swarm parameters and dielectric strength of C<sub>5</sub>F<sub>10</sub>O and its mixtures with CO<sub>2</sub> and dry air
Mai Hao, Boya Zhang, Xingwen Li, Jiayu Xiong
Abstract
Abstract Perfluoroketone C 5 F 10 O is considered as a potential SF 6 alternative. The global warming potential of C 5 F 10 O is extremely low and even close to that of air. We investigated the electrical insulation properties of the C 5 F 10 O by pulsed Townsend experiment. The rate coefficients of ionization, attachment, and effective ionization, as well as the electron drift velocity and the longitudinal electron diffusion coefficient in pure C 5 F 10 O were obtained. We conclude that the density-reduced critical electric field of pure C 5 F 10 O is (768 ± 5)Td and ion kinetics are not exist or negligible in C 5 F 10 O. Furthermore, the swarm parameters of C 5 F 10 O/CO 2 and C 5 F 10 O/Air mixtures with C 5 F 10 O percentage up to 30% were measured in a wide E / N -range. C 5 F 10 O has good synergism with both CO 2 and dry air and air behaves better. The synergistic effect coefficients were also calculated. To have the same ( E / N ) crit as pure SF 6 , the mixing ratio of C 5 F 10 O should be 30% in the mixture with CO 2 and 26% in the mixture with dry air. The obtained electron swarm parameters in this paper provide a supplement for the fundamental data set of these novel gases, and also lay the foundation for fluid model simulations of gas discharge.