Abstract
The first order of the method of spherical harmonics (P1-approximation) has been used to evaluate the radiation properties of arc plasmas of various mixtures of SF6 and PTFE ((C2F4)n, polytetrafluoroethylene) in the temperature range (1000 ÷ 35 000) K and pressures from 0.5 to 5 MPa. Calculations have been performed for isothermal cylindrical plasma of various radii (0.01 ÷ 10) cm. The frequency dependence of the absorption coefficients has been handled using the Planck and Rosseland averaging methods for several frequency intervals. Results obtained using various means calculated for different choices of frequency intervals are discussed.
Highlights
An electric arc between separated contacts is an integral part of a switching process
The mean absorption coefficient values depend on the choice of the frequency interval cutting
The influence of an admixture of PTFE on the values of the net emission coefficients of SF6 plasma is given in the Fig. 5 for plasma thickness 0.1 cm
Summary
An electric (switching) arc between separated contacts is an integral part of a switching process. For all kinds of high power circuit breakers, the basic mechanism is to extinguish the switching arc at the natural current zero by gas convection. In the mid and high voltage region, SF6 self-blast circuit breakers are widely used. Radiation transfer is the dominant energy exchange mechanism during the high current period of the switching operation. Several approximate methods for radiation transfer in arc plasma have been developed (isothermal net emission coefficient method [7, 1, 8], partial characteristics method [2, 11], P1-approximation [9], discrete ordinates method [9], etc.). The P1-approximation has been used to predict radiation processes in various mixtures of SF6 and PTFE plasmas
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