220kv Class Power Transformer

The 220kV class oil-immersed energy-saving transformers produced by our company utilize advanced simulation software to perform quantitative analysis of electrical, magnetic, thermal, and mechanical forces, in order to determine the minimum safety factor and optimize product structure. These transformers feature low losses, low noise, low temperature rise, high reliability, leakage-free design, and maintenance-free operation, with all performance indicators reaching industry level. Our company possesses fully enclosed air-conditioned modern workshops that control temperature, humidity, and dust levels in the production environment, supported by mature processes and intelligent production equipment, ensuring safe and reliable product operation. This series of products is suitable for power plants, substations, new energy wind power/photovoltaic power stations, and large industrial enterprises such as mines and petrochemical plants.

The 220kV class product series covers a full range of products including various insulation levels, various frequencies, generator main transformers, start-up/standby transformers, tie transformers, and testing transformers, both for domestic and international applications.

The core adopts a six-step full-miter step-lap stacking method. The core is tightened using steel tie bars, side beams, and upper beams.

The coils are wound using a vertical winding machine and tightened with a pneumatic tensioning device. The white (unimpregnated) coils are dried using kerosene vapor phase drying, achieving thorough drying. After compression using a 200t hydraulic press, the axial height of the coils is effectively maintained constant.

Coil assembly onto the core is carried out in a clean room for active part assembly. Before coil assembly, the verticality of the core limb is measured using an infrared vertical/horizontal level to ensure concentricity between the coil and the core.

The transformer tank adopts a flat-roof structure. The tank top and bottom are cut from integral steel plates. The tank is manufactured using an integral pre-assembly process. After passing leakage testing, integral sandblasting and rust removal are performed, achieving a rust removal grade of Sa2.5 or higher.

The tank is analyzed using 3D finite element strength analysis and 3D solid modeling. Manufacturing employs domestically advanced automatic submerged arc welding, ensuring that the tank welds are leak-free.