Abstract:
One of the problems in designing new arc-quenching devices for HV gas-blast circuit breakers is the choice of an insulating arc-extinguishing medium, since the main insulating medium – sulfur hexafluoride (SF$_6$) – is a greenhouse gas. Much attention to insulating gas environments with a low density relative to SF$_6$ (dry air, N$_2$, CO$_2$) is paid. The structure of the gas flow in the arc-quenching device has a significant impact on the rate of electrical strength recovery of the contact gap. In this paper, the interdependence between the generation of turbulence and the processes of electrical strength recovery in the thermal phase of breakdown for gases of different densities (N$_2$, CO$_2$, SF$_6$) in a typical configuration of an arc-quenching device based on a Laval nozzle are studied.
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