The power supply line used for technical maintenance and repair comes from an external ground power supply

According to the draft design results of the supporting electrical equipment and considering the optimization experience abroad, the following train power supply busbars are proposed: 3000V DC or 50Hz converter (high voltage); 110V DC (battery pack) and 650V DC (after high-voltage primary conversion Voltage). In addition, the passenger car should be able to be powered by an independent ground high-voltage power supply, and the power supply line used for technical maintenance and repair comes from an external ground power supply, and its rated voltage is 380V50Hz alternating current (three-phase and neutral). If the first two bus types are traditional power supply lines for railway transportation, then the 650V DC bus is listed as an auxiliary bus. The basic purpose of the auxiliary bus is to concentrate the power supply to the vehicle electrical appliances directly or via the secondary power supply after the high-voltage electricity has undergone the primary conversion. The characteristic of the bus is to ensure that when the main power supply fails or fails, the backup power supply can be used to supply power to the electrical appliances.

In the vehicle's air conditioning system, a universal converter is used to power various types of air conditioning devices. When switching from one type of air conditioner to another, there is no requirement to change the hardware of the universal converter. The schematic diagram of the structure of the electrical equipment. Look at the auxiliary power bus scheme using three-phase alternating current with rated voltage 380V / 220V50Hz. The advantage of this type of busbar is that the number of secondary converters that supply power to electrical equipment may be the smallest, and the variety of electrical equipment with standard supply voltage may have the most choices. The main disadvantage of this type of busbar is that complex and expensive AC voltage phase synchronization devices must be used between the vehicles of the EMUs. However, there is no such busbar on the EMUs, and it is not used on the trains pulled by locomotives, so the generalization of electrical equipment is impossible.

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