Comparative Analysis of Partial Discharge Characteristics of an Eco-Friendly Insulation Gas

The Sulphur hexafluoride (SF
6
) is mostly being used as a current insulating medium of gas insulated switchgears (GIS) due to its excellent dielectric strength and arc extinguishing performance. The global warming potential (GWP) of SF
6
, however, is 23,900 times of that of CO2 and its life time in the atmosphere is 3,200 years. For this reason, new eco-friendly gases to replace SF
6
should be needed. In this paper, the PD characteristics of eco-friendly gases applied to gas insulated switchgear are studied, and the defects of POC(particle on conductor) that can occur in GIS are considered. The DIV(discharge inception voltage), DEV (discharge extinction voltage), discharge amount, pulse number and phase pattern of SF
6
gas and environmentally friendly gas(g
³
, dry air) were compared under pressure.