Radiative Properties and Numerical Modeling of C4F7N-CO2-O2 Thermal Plasma

Authors

  • M. Gnybida Eaton European Innovation Center, Borivojova 2380, 52 63 Roztoky
  • Ch. Ruempler Eaton Industries GmbH, Hein-Moeller-Straße 7-11, 53115 Bonn
  • V. R. T. Narayanan Eaton European Innovation Center, Borivojova 2380, 252 63 Roztoky

DOI:

https://doi.org/10.14311/ppt.2019.2.144

Keywords:

radiation, thermal plasma, gas insulated switchgear, SF6 alternative

Abstract

C4F7N and C4F7N-CO2 mixtures are considered as alternatives to SF6 for use in medium voltage gas insulated switchgear applications (GIS), due to the low global warming potential and good dielectric properties of C4F7N. Current work is focused on the calculation of radiative properties (absorption coefficients) of C4F7N-CO2 thermal plasma and computational fluid dynamics (CFD) simulations of free burning C4F7N-CO2 arcs that are stabilized by natural convection. Absorption coefficients of C4F7N-CO2 plasma used in the CFD model are derived from spectral absorption coefficients by Planck averaging. An optimization procedure has been applied to find the optimal number of spectral bands as well as spectral band interval boundaries. Radiation and flow model results for C4F7N-CO2 in comparison to SF6 and air are provided and discussed.

References

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Published

2019-09-10

Issue

Vol. 6 No. 2 (2019)

Section

Articles

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