Transport Properties of Thermal Plasma Containing Fluoro-Nitrile (C4F7N)-Based Gas Mixtures

<p>Gas mixtures containing fluoro-nitriles C&lt;sub&gt;4&lt;/sub&gt;F&lt;sub&gt;7&lt;/sub&gt;N or fluoro-ketones C&lt;sub&gt;5&lt;/sub&gt;F&lt;sub&gt;10&lt;/sub&gt;O as minority components (&lt;20%) have been identified as promising alternatives to SF&lt;sub&gt;6&lt;/sub&gt; in medium voltage gas-insulated switchgear (GIS) applications, because of their low Global Warming Potential together with their dielectric strength values being comparable to SF&lt;sub&gt;6&lt;/sub&gt;. The buffer gases in such fluoro-nitrile or fluoro-ketone based gas mixtures are usually N&lt;sub&gt;2&lt;/sub&gt;, O&lt;sub&gt;2&lt;/sub&gt;, CO&lt;sub&gt;2&lt;/sub&gt;, or air. In this contribution, we provide calculation results of transport properties, assuming local thermodynamic equilibrium (LTE), of thermal plasma containing following gas mixtures: C&lt;sub&gt;4&lt;/sub&gt;F&lt;sub&gt;7&lt;/sub&gt;N-CO&lt;sub&gt;2&lt;/sub&gt; and C&lt;sub&gt;4&lt;/sub&gt;F&lt;sub&gt;7&lt;/sub&gt;N-CO&lt;sub&gt;2&lt;/sub&gt;-O&lt;sub&gt;2&lt;/sub&gt;. The modifications in the thermodynamic and transport properties upon the addition of oxygen to the C&lt;sub&gt;4&lt;/sub&gt;F&lt;sub&gt;7&lt;/sub&gt;N-CO&lt;sub&gt;2&lt;/sub&gt; mixtures in the temperature range 300&amp;thinsp;K-30&amp;thinsp;kK at 1&amp;thinsp;bar are provided and discussed. These properties have been utilized to calculate the plasma temperature profile for a free-burning arc in a companion paper.</p>