The low voltage adopts copper foil winding to make the electric field of the transformer evenly distributed. The inner frame of the low voltage adopts a molded hard paper tube. The compression pad adopts laminated wood to enhance the mechanical strength of the transformer. The transformer adopts vacuum oil injection, which can completely eliminate the bubbles in the coil and improve the electrical performance of the transformer. The box edge adopts stainless steel bolts, and the appearance is beautiful. A fully sealed fuel tank is adopted to isolate the transformer oil from the air and slow down the aging of the transformer oil. The sealing parts adopt molded parts to enhance the sealing reliability of the transformer. Combined with the oil-transformer terminal and intelligent terminal, by adopting power automation monitoring means and 4G communication technology, the purpose of real-time monitoring and wireless communication transmission can be achieved.