This design briefly describes the structure and maintenance of the main transformer of ceh1 EMU, expounds the maintenance of the main transformer in understanding the structure of the main transformer of EMU 3, discusses the layout of the main transformer of EMU and its importance in the train traction system, as well as the necessary factors for the maintenance of the transformer, and the traction system of EMU is a very important vehicle power source. EMU has nine key technologies, namely traction control system, auxiliary power supply system, air conditioning system, traction system, traction motor, traction transformer, network control, braking system and traction converter. Four of them are inseparable from traction drive system, so traction drive system of EMU is called "heart" of high-speed EMU. Based on the importance of this, after reading and understanding the relevant information, this paper introduces the working principle of traction transformer (main transformer) and expounds the maintenance and usual maintenance of its frequent faults, so as to improve the service life of main transformer.<br>
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