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SIIA Público
SISTEMA INTEGRAL DE INFORMACIÓN ACADÉMICA - PÚBLICO
Título del libro: Gd 2008 - 17th International Conference On Gas Discharges And Their Applications Título del capítulo: Electron swarm coefficients of CF3I and CF3I-N 2 and their comparison with those of SF6
Critical field strength; Dielectric behaviour; Diffusion Coefficients; Electron drift velocity; Electron swarm; High voltage; Ionisation; Ionization coefficient; Switch gears; Diffusion; Electron mobility; Electrons; Gas discharge tubes; Glow discharges; Ionization of gases
Resumen:
This paper reports the measurement of the electron drift velocity, the longitudinal diffusion coefficient, the ratio between the longitudinal diffusion coefficient and the electron mobility, and the effective ionisation coefficient for electrons in pure CF3I and CF3I-N2 mixtures [1]. A pulsed Townsend technique was used. The E/N range covered was 100-850 Td (1 Td=10-17 V cm2). The limiting or critical field strength for CF3I was found to be E/Nlim=437 Td, which is 21% higher than that of SF6 (E/Nlim=360 Td), a widely used insulating gas. Moreover, the curve of the effective ionization coefficients for the 70% CF3I-N2 mixture bears a very similar behaviour to that of pure SF6 in the vicinity of E/N lim. Thus, from the point of view of this parameter, CF3I seems to be superior in dielectric behaviour to SF6. Admittedly, many other tests are necessary to regard CF3I as a good dielectric and a likely substitute to SF6 in high voltage and switchgear applications.
