Studies on Different Dielectric Properties of Different Insulating Gases and Gas Mixtures as an Alternative to SF6 -Review

SF6 gas is considered as one of the most noxious kinds of atmospheric greenhouse gases with global warming potential (GWP) 23,500[10] times higher than that of CO2 and shelf life of 3200 years in the atmosphere. With threat of global climate change, policy makers all over the world have made regulations which promote renewable energy technologies. Developing countries including India are increasingly emphasising the need to rapidly restructuring of their energy system. A replacement for SF6 has been in testing and development for over a decade and have come up with different combination of gas and gas mixtures like N2, CO2, CF3I (Trifluoroiodo-methane), C4-fluoronitrile and C5-Fluoroketones along with different combination of the later with SF6. In recent years many gases are being investigated for breakdown voltage and partial discharge characteristics, such as C5F10O (C5 per uorinatedketone), C5F10O/N2 mixture, SF6 and CO2 gas mixture, Pd3-TiO2(101) (Titanium dioxide), C4F7N/CO2 mixed gases (Fluro nitrile and carbon dioxide), HFO-butene/ CO2 gas mixture (Hydrofluroolefin).