Design And Electromagnetic Analysis For High Speed Emu Traction Transformer

The high-speed railway developmental level is the embodiment of the national technical level and comprehensive national strength.Along with the rapid development of the world industrialization process,it is urgent to accelerate the turnover efficiency and reduce transportation costs.The above factors have promoted the rapid development of China’s high-speed railway technology.The traction main transformer is the core component of the high-speed EMU power source.It is the key component for realizing the voltage conversion and the secondary energy distribution in the traction system according to the system requirements.The quality status and performance parameters of traction transformer directly affect the operation safely and efficiently of EMU vehicle system.This paper described the design process of high-speed EMU traction main transformer,included the electromagnetic parameters of core and coil,composite short-circuit impedance,loss calculation,temperature rising calculation,insulation system design and so on.the paper studied the main transformer designing and development process,and electromagnetic field analysis and other aspects,according to the electromagnetic induction principle,technical input data and installation space requirements.Ansoft Maxwell 3D electromagnetic analysis software was used for electromagnetic field calculation,and CATIA 3D software was used to the main transformer desining for builting 3D modeling and assembly verification,and FEA finite element analysis before prototype production,these softwares improved the design success rate and optimization designing of the traction transformer.This desining method greatly saves its design and development cycle time and improves the rapid response and competitiveness to the market.According to the calculated parameters,optimized data scheme and transformer 3D parts drawings showed in this paper,the prototype of traction transformer was produced for routine test and type test.Its comparison calculation results between the calculated data and experimental data proved the calculation method adopted in this paper were right.The tolerance between the calculated data and the test data met the engineering design requirements of the EMU traction transformer.In this paper,the equivalent single-turn inductor method was used for the composite short-circuit impedance calculation of the transformer,which effectively solved the problem of complex modeling and the calculation difficultly of composite short-circuit impedance of multi-winding traction transformer.This method was based on the equivalent single-turn inductor theory in traction transformer equivalent circuit.The model and the matrix equation and its transformation equation were used for the short-circuit impedance calculation of the multi-winding traction transformer.The calculation theory of the short-circuit impedance between all the windings be via the equivalent single-turn inductor matrix equation tool.It was combined with the known condition of the traction transformer,calculated the composite short-circuit impedance value rapidly with the general Matlab calculation program.The test results showed that the method mentioned in this paper has higher calculation accuracy and met the needs of engineering designing requirements.