抄録
A new type non-flammable large power transformer system is proposed in which the excellent cooling characteristics and insulation properties of non-flammable perfluorocarbon (PFC) Liquid is utilized. In the system, transformer windings are put in an insulating cylinder filled with PFC liquid. The core includes cooling panel through the liquid. The space between the insulating cylinder and tank is filled with compressed SF6 gas. This paper descrides the insulation characteristics of main insulation and inter-winding insulation models which simulate the transformer. It is found that: (1) higher withstand voltage is expected by means of insulation barriers in main insulation model; (2) partial discharge in inter-winding insulation model is beginning to behave in a constant electric field strength on the point of 0.1mm liquid gap length.
