The S9-M series three-phase oil-immersed transformer adopts afully oil-flled,sealed corrugated oi tank.and the oil tank shell adapts tothe expansion performance of the oil withits own elasticity and meets the heat dissipation requirements.It has the characteristicsofhighefficiency and low loss,which can save a lot of power consumption and operating costs,and iswidely used in power plants,substations,industrial and mining enterprises,ports,airportsand other environmental protection places CStandard:IEC60076-1,IEC60076-2,IEC60076-3,IEC60076-5,IEC60076-10.