Electrical insulation characteristics of CO₂ and CO₂ gas mixtures under non-uniform electric field

摘要

Since SF₆ gas has been specified as one of the greenhouse gases, we attempt to develop new insulation gases or gas mixtures alternative to SF₆ gas for gas insulated switchgears (GIS). In this paper, we investigated partial discharge (PD) and breakdown (BD) characteristics of CO₂ gas and CO₂ gas mixtures as one of the promising candidates without using SF₆ gas. Experimental results revealed PD inception and BD strengths for different gas pressure and CO₂ content under lightning impulse voltage and ac high voltage application.