35KV S9 series three-phase oil-immersed transformer performance in line with national GB1094-1996" transformer" GB / T6451-1999" three-phase oil-immersed power transformer technical parameters and requirements of" standard, core adopts the high quality cold rolled silicon steel sheet, used the ladder to three joints, surface coating curing paint, reduces the loss and noise; coil high-quality oxygen-free copper wire winding, heat dissipation using new oil passage structure, reasonable design, and optimize the insulation process, improves the mechanical strength and anti short circuit ability, beautiful appearance, reliable operation. Widely used in substation () and the urban and rural power grid.