External medium voltage power supply system for motor train unit

Abstract

Disclosed is an external medium voltage power supply system for a motor train unit. The external medium voltage power supply system comprises a normal external medium voltage power supply circuit and an emergency external medium voltage power supply circuit; the external medium voltage power supply system is characterized in that the two sides of an external power supply contactor are connected with an AC / DC conversion power supply module through a diode separately; and the other end of the AC / DC conversion power supply module is connected with an external medium voltage power supply through a normally-open contact of an emergency external phase sequence detection contactor. The apparatus has the following three remarkable effects: 1, the system is provided with a hard line interlocking circuit, so that vehicle safety can be ensured; when a misoperation is done by a person for external connection before falling down, it is ensured that a pantograph type current collector automatically falls down when an external power supply is not inserted in the vehicle, namely when an external key is pulled off, in order to ensure that external power supply and high voltage power supply do not supply power concurrently; 2, the external key is provided, so that only one external power supply can be connected to the whole motor train unit in order to prevent interphase short circuit of two power supplies; and 3, the emergency power supply circuit is provided, so that it is ensured that a charger can be started through an external power supply interface to charge a storage battery when the vehicle storage battery is out of power while a control power supply is not available.

Description

technical field [0001] The system belongs to the field of railway transportation, and specifically relates to an external medium-voltage power supply system for EMUs. Background technique [0002] With the rapid development of the high-speed rail business, the EMU has become one of the most important means of transportation. In order to facilitate maintenance, the EMU has two or more external medium-voltage power supply interfaces on the vehicle for maintenance and charging in the depot. . [0003] There are two main ways to implement the existing external medium-voltage power supply: [0004] The first method is: set up external medium-voltage power supply interfaces on two pantograph trolleys respectively, set two external medium-voltage power supply interfaces in each pantograph trolley, the two external connections are interlocked through the circuit, and the two pantograph trolleys There is no interlock between the external power supply interfaces of the bow car. At ...

AI Technical Summary

Problems solved by technology

At the same time, the vehicle is equipped with multiple medium-voltage extended contactors and relays to separate the medium-voltage power supply line of the vehicle into multiple buses. When the external power supply on the ground is used for external power supply, the train network control system closes the corresponding extended contactor according to the vehicle configuration. To supply power to each vehicle load, the disadvantage of this external power supply method is that the external power supply interfaces of two pantograph vehicles cannot be interlocked; and the vehicle needs to be equipped with a large number of medium-voltage contactors and relays for medium-voltage Distribution and bus separation, increasing failure points

[0006] It can be seen that these two solutions cannot charge the vehicle through an external medium-voltage power supply when the battery is running out of power, which requires a large number of low-voltage power supplies to be configured in the maintenance depot of the motor vehicle, which increases a lot of costs and is inconvenient for maintenance.

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