Oil-immersed transformer exclusive for  petrifaction
Iron core:the iron core is made by crystal grain-oriented silicon-steel sheet;GEORG cross cut shear(made in West Germany)is adopted to cut the silicon-steel sheet with a 45°joint seam;fold the sheet into a multistage round vross-section to reduce the noise and power consumption.
Coil:cylinder type for high voltage ;cylinder type or foil type for low voltage ;this can increase the ability to resist short circuit and strike;and the distribution of magnetic path is more rational.
Oil tank:the oil tank is made by fine cold-rolled steel sheets;GEORG corrugation oil tank production-line is adopted;rust cleaning and phosphate treatment are applied for the surface of the oil tank ,then,antiseptic coating material is applied on the surface,which can meet the requirements for petroleum and chemical industry (much oil stain and many chemical substances).In addition,the corrugations not any possess heat radiation function,but also meet the requirement for oil expansion and oil contraction under normal performance.The isolation from air guarantees a low aging speed of oil and a long life expectancy of transformer.
Standard:the techniacl standards for this tranformer are GB1094.1~2-1996,GB1094.3,5-2003.The technical standards for our S9-M series transformer meet the national standards of S9 series transformer.