Design And Research Of Large Capacity Three-phase 500kV Transformer For Pumped-storage Power Station

With the growth of power grid capacity, pumped storage power station transformer capacity and demand is more and more big, Due to the particularity of pumped storage power station location, there is very high requirements on the reliability of the transformer. A few years ago, the main transformers manufacturers are ABB, Siemens, Toshiba and other foreign or joint venture manufacturers. With domestic transformer manufacturers of technical progress in recent years, domestic manufacturers of products begin to enter to pumped storage power station's scope of supply, but because of the lack of production experience, the supply quantity and quality also has a big disparity with the foreign manufacturers.This topic to a pumped-storage power station with large capacity 500kV transformer as the research object, and further study of pumped storage power station transformer engineering application of key technologies, promote the progress of localization of the transformer, speed up the development of the national power, to further improve product performance and realize a comprehensive upgrade power transmission and transformation equipment design and manufacturing technology, improve the international competitiveness.EHV transformer technology research at the same time, through the communication, to master the large capacity three-phase 500kV transformer design and manufacturing technology, increasing extra-high voltage transformer independent research and development, innovation ability. Pumped storage power plant can give full play to its own rapid response characteristics, effectively guard against the risk of power grid failure, prevent accident expanding and system collapse, as pumped storage substation transformer, one of the main equipment is particularly important. Pumped storage substation transformer in the peak of power supply, one of the host as a generator, transmission on the Internet, in the trough of power supply, as a step-down transformer, draw on the grid electricity used as motor.This paper refer to the related literature, in combination with pumped storage the running environment of main transformer substation, technical characteristics, key technique parameters, focusing on longitudinal insulation, water cooling system, the main technical problems such as leakage and local overheating, this topic mainly using finite element method, electromagnetic field theory, insulating material, material mechanics, mechanical principle, theoretical mechanics theory, analysis of software validation, guarantee the design margin.This topic through the application of IMV software to simulate the process of product wave analysis, understand the standard lightning impulse voltage distribution inside the winding, adjusting and optimizing winding and longitudinal insulation structure, the impact of the winding so as to ensure product margin and the purpose of saving raw materials; By applying VEI of Main Insulation and Leads the software to analyze the electric field, and can understand prototype during the design phase of the distribution of electric field in the Main Insulation, electric potential and field intensity contours, at the same time you can pick and choose the specific voltage line is analyzed, so as to ensure the prototype of the purpose of the Main Insulation margin and save raw materials; By applying VEI the REST of the ability of the short circuit strength of product were analyzed, and the winding axial upsetting and spoke to the buckling and the axial force calculation, the weak spot of the prototype to adjust in advance, ensure the safety and reliability of the product operation.