220kV oil immersed power transformer produced by our company is based on the digestion and absorption of advanced technologies at home and abroad, according to the characteristics of China's urban and rural power grid is developed, its performance index is better than GB/T6451 "three-phase power transformer technical parameters and requirements", "full compliance with JB/T3837-1996 transformer products model establishment method"GB1094.1-1996; GB1094.2-1996; GB1094.3-2003; GB1094.4-2005; GB1094.5-2003 power transformer manufacturing standard and IEC recommendation standard IEC60076. This series of products has the characteristics of low loss, low noise and no hanging core. It has made extraordinary innovations in terms of safety and economy and made it become a first-class technology product in China.

The main features of the product are as follows:

Significant energy saving effect

Tank

　　The structure of the tank is bell type. The wall of the box is welded with a folded plate type iron or iron plate to strengthen strengthen, improve the mechanical strength of the tank (can withstand vacuum positive pressure 133Pa, 0.1MPa); the tank sealing part are special processing, and the whole body "shot" processing, to eliminate sharp burrs, welding slag and lead oxide on the surface in the processing, using high performance two-component paint to improve the adhesion of the film, the appearance is beautiful and durable.The conditions of the radiators and components are simulated on the site to be installed and tested to effectively ensure the elimination of the leakage points. All flanges are fined, with slotting and limiting structure. At the same time, oil resistant, weather resistant and ozone resistant high quality butyl rubber seal gaskets are used to prevent leakage of transformers. In addition, when dealing with the bolt connection between the upper and the lower oil tanks, the seam sealing box can be used along the structure according to the needs of the customer.

　　In short, our company relies on the progress of science and technology, with the help of the perfect quality assurance system, through the strong sense of responsibility and pioneering spirit and effective work of all staff, the company's products always keep low location, low noise, low loss and high reliability.All of the company's oil immersed power transformer products have not been released from damage accidents and leakage. The transformer body assembly is completed in the fully enclosed constant temperature and constant pressure purification room, which achieves the cleaning requirements of 220kV products and constant temperature requirements of the body, and ensures the cleanliness and dryness of the body.At the same time, the imported kerosene steam phase drying equipment is used to make the cleanliness of the product better. The lower part of the holder body plate, an upper platen uses electrical laminated cardboard machine high strength, good electrical performance, the transformer block all stay, after two times of densification processing and rounding process, reduces the partial discharge.Steel clamps and pressing steel nails have sufficient strength to choose jacket pulp insulation pressure screw bowl, and the support block, a stay, the pressure screw position, as far as possible to make the winding force relative balance, improve the stability of the whole body.The body adopts a whole set of constant pressure drying technology to shorten the assembly time of the stabilisation of the winding. The center of each winding can be adjusted as much as possible, so that the reactance of each coil is equal, and the windings are subjected to uniform force, thus the resistance to short circuit of each winding can be improved.In addition, under the clamping piece and the lower part of tank, the upper beam and the upper tank adopts steel positioning, through the back pressure regulating locking nail. Therefore, the body in the tank can withstand the impact test under various transportation conditions and the axial electric power in the operation without displacement.In addition, the oil oriented structure is arranged in the high, low, and voltage regulating windings, which reduces the hottest heating of the winding and prolongs the service life.

　　Independent of the regulating winding (for OLTC), the more the winding ampere turn balance, improve the stability and eliminate the instability caused by deformation, effectively reduces the external transformer short-circuit when the axial electric power, improve the dynamic stability of the transformer in the external fault case.

　　Press plate local photo

　　The iron core stack adopts 5 step step lap structure, and the stack is 45. The structure of all oblique ligation. The silicon steel sheet is cut by the shear line introduced by jeger company in Germany, and the burr is less than 0.02mm. In addition, the advanced iron core stacking turn over platform, strict stacking and no pre stack iron choke technology fully ensure the grain oriented characteristics of the cold rolled silicon steel sheet, and effectively reduce the no load loss of the transformer.The clamp structure is plate clamp, and the magnetic shielding is installed on the clip to reduce the stray loss. The iron core clamping using a unique American import CIGNA with clamping handicraft bang, fully guarantee the level of core clamping. At the same time, many years of mature technology has made iron core, pull plate, supporting beam and pad become a solid whole, ensuring that the core is in the best stress state, which not only reduces the no-load loss, but also greatly reduces the noise.High, low, and voltage regulating windings are wound on a high - strength insulating cylinder. The low voltage winding transposition wire or semi hard copper wire; voltage winding adopts high strength composite wire and Denison paper imports do turn insulation high, adjustable, improves the filling coefficient of transformer bars, reduce the eddy current loss and current loss of the wire, improve the transformer short-circuit resistance.All the auxiliary winding is provided (stays are arranged outside the lock, strengthen the brace) stays, winding the amplitude to tighten by zero margin design, when winding adopts wire tensioning device, transpositions using unique climbing pad, thus greatly enhance the mechanical strength of the winding and the anti short circuit ability.

　　The no-load loss is 35% lower than that of the national standard GB/T6451-1999, and the load loss is 10 to 20% lower than the national standard.

　　High voltage regulating tap lead to fixation and lead to switch, low voltage lead copper fixed on the iron core clamp and the lower part of tank on the plane, improve the lead stability, and head coil binding technique requirements and process guarantee, fully meet the requirements of low partial discharge.

　　tank

　　High pressure side of oil tank