A new approach of thermal transfers modeling in electrical arcs at the opening of a high voltage circuit breaker will be presented. For instance, the arc equations will be coupled with the energy conservation equations. This approach enables to take into account the temporal variations of the temperature and dissipated energies during the extinction phase. On the other hand, the finite elements method is introduced in order to investigate the temperature profile variations. An arc quenching for a default current of 50 kA, 245 kV, SF_6 line breaker has been simulated. The results obtained by this coupling will be compared to applied measurements available through the literature.
Using spectroscopic measurements vibrational and rotational temperatures were determined in the "ferroelectric" plasma source for different gas mixtures. It was shown that in this time-periodical, atmospheric pressure non-equilibrium discharge, both plasma temperatures differ strongly, and that the vibrational temperature is much higher (≈ 3 kK) than the rotational one (< 1 kK).
Using spectroscopic and electric measurements, vibrational and rotational molecular gas temperatures as well as free electron temperature and concentration were determined in different regions of a time-periodical type, atmospheric pressure non-equilibrium low current gliding arc. It was shown that this discharge includes an initial quasi-equilibrium zone, with the quasi-equilibrium temperature of 4 to 6 kK, and the non-equilibrium zone with the electron temperature about 10 kK, the vibrational temperature about 3 kK, rotational and translational temperatures from 1 to 1.5 kK. The transition between two mentioned zones coincides with the phenomenon of the arc "length explosion" already observed in moderate-current gliding arc.
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