A transformer oil filling device and an operation method

A transformer oil filling device provided by the invention comprises a buffer tank, an oil tank, a valve group, a nitrogen cylinder and a vacuum unit. The buffer tank is connected with an upper stop valve of the transformer body through a duct pipe, and the oil tank is connected with a lower stop valve of the transformer body through an oil pipe. The valve set consists of valve 01, valve 02, valve04 and valve 03 sequentially connected in series. Through the valve group operation, control the buffer tank, nitrogen cylinder, vacuum unit and the passage between the tank and transformer, to achieve oil drain, exhaust, oil injection, moisture, pressure relief and other functions. The equipment is small in size and light in weight, and can be transported to the customer site for operation, thusreducing the maintenance cost of the transformer. 本发明提供的变压器注油设备，括缓冲罐、油罐、阀门组、氮气瓶、真空机组，所述缓冲罐通过导气管连接变压器本体的上截止阀，所述油罐通过输油管连接变压器本体的下截止阀；所述阀门组由阀门01、阀门02、阀门04和阀门03顺序串联而成。通过阀门组操作，控制缓冲罐、氮气瓶、真空机组和油罐与变压器之间的通路，实现放油、排气、注油、防潮、释压等功能。该设备体积小、重