S9, S10, S11 series three phase oil-immersed transformers conform to the standards of IEC, GB1094 Power Transformer and GB/T6451-2008 Technical Parameters and Requirements of Three-phase Oil-immersed Power Transformer. With the application of domestic and overseas advanced techniques, our products are made of high-quality raw materials with optimized design, which enables more compact structure and higher capability. The transformer core is made of quality cold-rolled silicon sheet steel and is of a full-miter non-puncture structure. The coil is made of quality oxygen-free copper, featuring good outlook and safe running. The products are widely used in power transmission and distribution of industrial and agricultural power networks.