... 1,10kV, S9 ,3 phase oil immersion power transformer 2,high efficiency,low loss 3,Low losses and ... three-phase oil-immersed distributing transformer applies new type insulating structure and makes short-circuit resistances strong.The iron core ... Hz;6)Vector group: Dyn11, Yyn0 or others;7)Short circuit impedance: 4%, 4.5% ,6% or others in ... oil cooling 10kV, S9 ,3 phase oil immersion power transformer