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The influence of the arc-quenching medium density on the rate of electrical strength recovery of the intercontact gap
Averyanova S.A.
1, Obraztsov N.V.
1, Kurakina N.K.
1, Tonkonogov E.N1
1Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
Email: nkuriee@gmail.com, obraztsovnikita@yandex.ru
One of the problems in designing new arc-quenching devices for HV AC gas-blast circuit breakers is the choice of an insulating arc-extinguishing medium, since the main insulating medium sulfur hexafluoride (SF6) is a greenhouse gas. Much attention to insulating gas environments with a low density relative to SF6 (dry air, N2, CO2) 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 (N2, CO2, SF6) in a typical configuration of an arc-quenching device based on supersonic nozzle are studied. Keywords: switching arc, electrical strength recovery, turbulence, breaking capacity, numerical simulation.
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