1,10kV, S9 ,3 phase oil immersion power transformer 2,high efficiency,low loss 3,Low losses and Low Noise Describtation of the product: ... type structure.All fasteners have been processed with special treatment to prevent them from losening.StandardsGB 1094.1-1996 GB ... / 5%or others in according to client needs;10)Cooling type: oil nature, oil cooling 10kV, S9 ,3 phase oil immersion power transformer