Environmentally friendly high-performance gas insulation system using CF3Igas

SF_6气体具有很高的全球变暖潜值（GWP），是限制排放的气体之一。因此，近年来人们积极研究和开发SF_6的替代绝缘气体。以空气或N_2气体为绝缘气体的GIS是近年来发展起来的。然而，72kV以上的GIS大多仍使用SF_6气体。因此，改善SF_6替代气体的绝缘性能是一个重要的课题。CF_3I气体的GWP值低，其绝缘性能与SF_6气体相当或优于SF_6气体上级。通过测量不同非均匀电场下的放电电压、绝缘材料表面的闪络电压以及放电和闪络产生的副产物，考察了CF_3I的替代性。

SF_6 gas has high global-warming-potential (GWP), and is one of the gases for the restriction. Therefore, the research and the development of alternative insulating gases to SF_6 are actively done in recent years. GIS, in which air or N_2 gas is used as insulating gas, is developed recently. However, most of GIS for more than 72kV class still use SF_6 gas. Therefore, the improvement of insulation performance of SF_6 substitutions is one of important issues.In this research, CF_3I gas which is one of promising SF_6 substitutions is examined. The GWP of CF_3I gas is low, and its insulation performance is equal or superior to SF_6 gas. The substitutability of CF_3I is examined through measuring sparkover voltages in various non-uniform electric fields, flashover voltages on the surface of insulating material and by-products generated by the sparkover and the flashover.