A short-circuit test method for a medium-voltage busbar of an EMU

Abstract

A short-circuit test method for a medium-voltage bus of an EMU, which is characterized in that it includes the following steps: 1) The train is provided with multiple auxiliary converters, each auxiliary converter is connected in parallel for output, and N coupling switches are set on the medium-voltage bus, and the normal operation is In the closed state, ensure that the medium-voltage bus runs through all columns; 2) Once a short-circuit fault occurs in the vehicle, first confirm whether it is an internal fault in the auxiliary converter to reduce the scope of the fault; 3) If there is no short-circuit fault in the auxiliary converter, the vehicle will Start the external short-circuit test program, open N coupling switches, divide the medium-voltage bus into N+1 sections, and then put in the auxiliary converters to judge the faulty bus section; 4) After confirming the faulty bus section, open the adjacent 1 or 2 coupling switches, and the non-adjacent coupling switches are closed to ensure the normal operation of medium voltage loads in the bus section without short circuit. The invention can refine the short-circuit fault point, reduce the range of fault influence, even avoid the fault influence, and maintain the operation of the vehicle to the greatest extent.

Description

technical field [0001] The invention relates to a short-circuit test method for a rail vehicle, in particular to a short-circuit test method for a medium-voltage busbar of an EMU. Background technique [0002] In recent years, the development of high-speed railways is changing with each passing day. As a means of carrying people on high-speed railways, EMUs have become the first choice for people to travel. As an important part of the EMU, the auxiliary converter is responsible for providing cooling for high-voltage traction components and providing power for passenger comfort loads such as passenger room air-conditioning systems, kitchens, and electric boilers. Once a fault such as a short circuit occurs in the auxiliary power supply system, how to minimize the impact range is one of the main guidelines for auxiliary system design. [0003] Usually, multiple auxiliary converters for EMUs provide medium voltage for vehicles. Two or more contactors are installed on the mediu...

AI Technical Summary

Problems solved by technology

[0004] The first way is to install multiple contactors on the entire medium-voltage busbar. Once a short circuit occurs in a certain busbar section, the contactor will be closed, and the power supply will be extended by other auxiliary converters. The extended auxiliary converter will also stop due to short circuit. Until there is only one auxiliary converter left in the whole row to supply power to the medium-voltage loads of the three vehicles, this method will expand the impact area of ​​the short circuit and cause poor availability

[0005] The second method is to install only one contactor on the entire medium-voltage bus. Once a short circuit occurs in a certain bus section, the contactor will open, and the traction power, auxiliary converter and medium-voltage bus of the half-train unit will be directly lost.

[0006] If a short circuit occurs in the two methods, it is impossible to distinguish whether the short circuit occurs inside the auxiliary converter or on the busbar, which will always cause the loss of the medium voltage busbar (at least 4 vehicles), and even expand the scope of the fault

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