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　　The electric arc furnace transformer is one of the most representative types of the electric furnace transformer，It is also more frequent and intense than other kinds of transformers that the working short circuit and the harmonic shock are subjected to operation.Therefore, high requirements have been put forward for the electric arc furnace transformer in the design calculation, the structure form, the manufacturing process and the test.

　　Our company is the leading production enterprise of domestic electric furnace transformer and the leading drafting enterprise of the state standard of all electric furnace transformers.Since the establishment of our own factory, the electric arc furnace transformer has been the leading product.The whole process of designing and manufacturing a 0.5 ton steelmaking furnace transformer from an arc furnace transformer to the design and manufacture of a 220 ton electric arc furnace transformer in 2010 from the 60s of last century，Through the gradual improvement of the electric arc furnace transformer used in domestic steelmaking furnace, the national standard of the electric arc furnace transformer has been formulated and revised.In particular, since the reform and opening up, the advanced technology and experience of foreign electric arc furnace have been absorbed. The electric arc furnace transformer with long arc smelting is designed and manufactured with ultra-high power, high voltage and high impedance, which has promoted the technological progress of the domestic smelting industry.Arc furnace transformers from HSSP-1200/10 development (before 1960), after HSSP-4200/10 (before 1970), HSSP-7200/10 (1980), HSSPZ-25000/35 (1984), HSSPZ-40000/35 (2000), HSSPZ-63000/35 (2006), HSSPZ-90000/35 (2007), HSSPZ-140000/35 (2010) development process,

　　Since 1990, the supply of nearly 460 sets of electric arc furnace transformer for domestic and foreign users support, including the 63000kVA capacity above 30 sets products online operation, including the export of Indonesia, Iran, Russia and other countries, product performance is good.The HSSPZ-90000/35 of the ultra high power EAF transformer and the transformer HBSSPZ-45000/35 of the ladle refining furnace have also obtained the National Certificate of transformation of scientific and technological achievements at the same time. All the parameters of the electric arc furnace transformer produced by our company have reached the international advanced level.Arc furnace transformer is one of the most representative work in the furnace transformer, short circuit and harmonic the bearing in the operation process of the impact than other types of transformer is more frequent and more intense, so the electric arc furnace transformer, the design calculation, structure, manufacturing process and test are made high request.In the design scheme of transformer electric arc furnace, in order to enhance the ability to withstand short circuit winding of large transformer by concentric structure, winding wire preferred self-adhesive transposition wire, greatly enhance the ability to withstand short circuit of transformer at the same time, reduce the winding eddy loss and stray loss.The main longitudinal insulation margin of the electric arc furnace transformer is increased to improve the safety factor of its overvoltage impact during operation.In the process of manufacturing the electric arc furnace transformer, the advanced structure is adopted to reduce the loss of air load and enhance the ability to withstand impact.

　　For example, the multi step lap core structure, inclined slot hole free binding structure, and strictly control the cutting burr, and adopts advanced core stacked flip Taiwan, pre stack yoke process measures, and fully guarantee the characteristics of cold rolled grain oriented silicon steel sheet, effectively reduce the no-load loss of the transformer.The low voltage winding impregnation process measures, enhance its stability, transformer suit process, based on the strip adjustment, ensure winding and core and winding and winding "zero tolerance" suit, in order to enhance the mechanical strength of the winding and the ability to withstand short circuit.The body is completed in a completely closed constant temperature and constant pressure cleaning room to meet the cleaning requirements and constant temperature requirements of the 220kV grade products and ensure 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 bracket of the lower part of the body and the upper press board all adopt the high mechanical and electrical properties of the electrotechnical laminated board. Steel clamps and pressing steel nails have sufficient strength to choose jacket pulp insulation pressure screw bowl, and reasonable layout of the support block, a stay, the pressure screw position, the winding force relative balance, improve the stability of the body.The body adopts the whole set of constant pressure drying technology to shorten the assembly time of the body. To ensure that the center of each winding is the same, so that all the windings are subjected to uniform force, thus improving the capacity of each winding to withstand short circuit.Besides, the six direction positioning measures are adopted for the body and the oil tank and the box cover to ensure the stability of the transformer in the transportation process, so that the field can be directly positioned, and the structure without suspending core is realized, which provides great convenience for on-site installation.

　　After the whole transformer assembly is completed, the leakage point is checked through the oil pressure test, and all the leakage points are eliminated before the transformer goes out, so as to ensure that the field will not leak. And the transformer is tested in accordance with the national standard, so that every transformer in the factory is the best.

　　Our company is the exclusive manufacturer that designs the transformer with 66kV and above electric arc furnace at the same time, and it can be designed as the three side interrupting and direct descending electric arc furnace transformer.The structure of products is the main advantage of electric arc furnace in order to solve the frequent power outages, circuit breaker short life, the operation of electric transformer in a side power case, reduces operation times of high voltage circuit breaker, reduces the operation cost because of the high voltage circuit breaker caused by frequent replacement of expensive, improved steelmaking the production efficiency of the system.Our company in the electric arc furnace transformer technology innovation at the same time, summarize and application as follows: two the patent technology outlet device of water-cooled electric transformer (ZL 200820072185.7), sealed furnace transformer three-phase single outlet box angle extraction structure (ZL 201020510450.2), sealed furnace transformer cooling tube leads to multiple angle structure (ZL, 201020510439.6) furnace transformer copper grounding structure (ZL 201020510455.5), electric furnace transformer low-voltage outlet copper bar height staggered structure (ZL 201020510502.6), electric furnace transformer control cable tray (ZL 20122 0174554.X), low pressure cold furnace transformer connection structure (ZL 201120197865.3) and a fixed frame with spiral plate strong electric transformer oil coolers (ZL 201220174595.9), electric furnace "8" shaped transformer low-voltage winding is connected in parallel Structure (ZL 201020510480.3), unequal turn coil coil structure of electric furnace transformer (ZL 201120197738.3) and so on.