抄録
In designing a Gas insulated bus (GIB) using N2/SF6 mixtures, there are many application problems such as the mixtures pressure to maintain the required dielectric and heat transfer performance. The problems on recycling SF6 are also essential in applying N2/SF6 mixtures. In this paper, the minimum breakdown field strength at lightning impulse and temperature rise of conductor and enclosure have been measured for N2/SF6 mixtures. Considering the dielectric and heat transfer properties, we clarify the application problems of mixtures to a GIB and discuss the appropriate mixture ratio of SF6 in designing the GIB comparable to the present dimension. And also the lowest limit of SF6 content in a liquefied recovering method is theoretically estimated for the reference of practical SF6 recovery from mixtures. It is important for the design to consider both breakdown phenomena including area effect of electrode and heat transfer properties of mixtures.
