Influence of the filling gas mixture on the interruption capability of medium voltage load break switches
Keywords:load break switch, alternative gas, thermal interruption capability, dielectric recovery
In today’s medium voltage switchgear SF6 is commonly used as insulating and arc quenching medium. Because of its high potential impact on the environment a substitution with an environmentally friendly alternative is pursued. In this paper the inﬂuence of the mixing ratio of carbon dioxide nitrogen mixtures as ﬁlling gas on the interruption capability in medium voltage load break switches is investigated. The interruption capability is regarded by means of the thermal interruption performance as well as the dielectric recovery of a model load break switch. The model load break switch allows an axial arc blowing with variable pressure and uses an exchangeable nozzle system.
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