Electron swarm coefficients and the limiting field strength of SF6–N2O mixtures

The electron drift velocities and the effective ionization coefficients have been measured with a pulsed Townsend apparatus for the SF6–N2O mixtures (1–75% SF6) over the combined density-normalized electric field strength, E/N, from 130 to 420 Td (1 Townsend = 10−17 V cm2). Strong electron detachment effects have been observed for gas pressure mixtures above 1 Torr due mostly to NO−, arising as a dissociation product of N2O. In contrast, the influence of detachment due to the negative ions from SF6 is shown to be very small. It has been found that the limiting electric field strength, E/Nlim, of the SF6–N2O mixture is slightly superior (25–5%) to that of SF6–N2 for SF6 amounts of 0–50%, respectively.

[1]  J. Urquijo,et al.  Ion mobilities and transport cross sections of daughter negative ions in N2O and N2O–N2 mixtures , 2013 .

[2]  E. Basurto,et al.  Measurement of electron swarm coefficients in C2F4-Xe and evidence of Penning ionization in C2F4-Ar , 2012 .

[3]  E. Basurto,et al.  Limiting field strength and electron swarm coefficients of the CF3I–SF6 gas mixture , 2011 .

[4]  Hitoshi Okubo,et al.  Recent trend and future perspectives in electrical insulation techniques in relation to sulfur hexafluoride (SF6) substitutes for high voltage electric power equipment , 2011, IEEE Electrical Insulation Magazine.

[5]  A. Juárez,et al.  Measurements and analysis of electron transport coefficients obtained by a pulsed Townsend technique , 2010 .

[6]  A. Juárez,et al.  Transport coefficients and cross sections for electrons in N2O and N2O/N2 mixtures , 2010 .

[7]  N. Hayakawa,et al.  Breakdown Characteristics of N2O Gas Mixtures for Quasiuniform Electric Field under Lightning Impulse Voltage , 2007, IEEE Transactions on Dielectrics and Electrical Insulation.

[8]  Edward A. Mason,et al.  Transport Properties of Ions in Gases: MASON:TRANSPORT PROPERTIES O-BK , 2005 .

[9]  J. Urquijo,et al.  Test of Blanc's law for negative ion mobility in mixtures of SF6 with N2, O2 and air , 2003 .

[10]  J L Hernández-Ávila,et al.  Electron transport and swarm parameters in CO2 and its mixtures with SF6 , 2002 .

[11]  James K. Olthoff,et al.  Electron Interactions With SF6 , 2000 .

[12]  E. Basurto,et al.  Measurement of ionization and electron transport in methane-argon mixtures , 1999 .

[13]  Daniel C. Cowles,et al.  Reinvestigation of the electron affinities of O2 and NO , 1989 .

[14]  R. J. Brunt,et al.  Collisional electron detachment and decomposition rates of SF−6, SF−5, and F− in SF6: Implications for ion transport and electrical discharges , 1989 .

[15]  R. J. Brunt,et al.  Collisional electron detachment and decomposition cross sections for SF−6, SF−5, and F− on SF6 and rare gas targets , 1989 .

[16]  R. J. Van Brunt,et al.  Electron‐transport, ionization, attachment, and dissociation coefficients in SF6 and its mixtures , 1988 .

[17]  Mark A. Johnson,et al.  Pulsed photoelectron spectroscopy of negative cluster ions: Isolation of three distinguishable forms of N2O−2 , 1988 .

[18]  Yoshiharu Nakamura.  Transport coefficients of electrons and negative ions in SF6 , 1988 .

[19]  H. Jungblut,et al.  Electron detachment from negative ions in sulphur hexafluoride , 1983 .

[20]  L. G. Christophorou,et al.  Gaseous Dielectrics III , 1982 .

[21]  D. Albritton,et al.  Reactions of O/-/ with N2, N2O, SO2, NH3, CH4, and C2H4 and C2H2/-/ with O2 from 300 K to relative kinetic energies of about 2 eV , 1975 .

[22]  B. C. O'Neill,et al.  Negative-ion/molecule reactions in sulphur hexafluoride , 1975 .

[23]  B. C. O'Neill,et al.  Collisional detachment of electron in sulphur hexafluoride , 1973 .

[24]  F. Fehsenfeld,et al.  Negative ion reactions in N2O at low energies , 1973 .

[25]  F. Fehsenfeld,et al.  Collisional Detachment Studies of NO , 1972 .

[26]  R. W. Fessenden,et al.  Dissociative Attachment of Thermal Electrons to N2O and Subsequent Electron Detachment , 1972 .

[27]  D. Parkes.  Reactions of the O– negative ion with hydrogen and the lower hydrocarbons , 1972 .

[28]  J. Moruzzi,et al.  Negative‐Ion–Molecule Reactions in N2O , 1968 .