What is a power set train and what is the power source of an EMU train

It is a combination of multi-power trains, electric EMUs are called EMUs, and diesel EMUs are called DMUs, and the power units are scattered on each carriage. A powered vehicle is called a motor vehicle, and an unpowered vehicle is called a trailer.

The power of the EMU** is distributed among the engines in the individual carriages of the train, rather than concentrated on the railway locomotive. Electric EMUs are divided into two types: DC EMUs and AC EMUs.

There are two ways to distribute traction power in EMUs, one is power dispersion, and the other is power concentration. But in fact, strictly speaking, the power centralized EMU can only be regarded as a copy and upgrade of the ordinary locomotive + vehicle mode.

The advantage of the power dispersion electric unit is that the power unit is distributed in different positions of the train, which can achieve large traction force and flexible marshalling. Because there are many wheelsets using power braking, the braking efficiency is high, and the speed regulation performance is good, and the braking deceleration is large, which is suitable for the line with more speed limit sections. Representatives:

Japanese Shinkansen, Chinese CRH series.

To put it simply, the body of the car is a power bogie, and you don't understand it if you talk too much.

EMU trains.

1. Electric EMU refers to passing through the catenary.

or the EMU that drives the traction motor with power supply rail, and is subdivided into two categories: DC electric unit and AC electric unit. An electric EMU is a special type of electric locomotive that runs on electrified railways.

Middle. 2. The diesel EMU is a diesel engine.

Powered decentralised railway vehicles. Compared with the centralized power of railway vehicles, it has better acceleration and deceleration performance, more average weight distribution, and lower loss to rail.

<> EMU and high-speed rail essentially belong to EMUs, but the speed levels are different, the speed of EMUs is about 200-250, and the speed of high-speed trains is about 300-350.

The EMU can run on the existing line (the signaling system of the ordinary EMU is compatible with the existing line), and the high-speed rail must run on the newly built passenger train (the signaling system of the high-speed EMU is not compatible with the existing line).

EMUs are divided into centralized power and decentralized power, China's common CRH series EMUs are power dispersed, and are AC transmission, in addition to subway trains can also be counted as EMUs (generally DC transmission).

If it is the D prefix on the train ticket, it is basically an EMU train that takes the existing line and the 250kmh standard passenger dedicated line.

The high-speed rail train is the G prefix, read high, and it is an EMU train running on the 350kmh level passenger dedicated line (there has been a G prefix cross-line train through Hening 250kmh standard passenger dedicated), and the general speed is faster than the D prefix.

In addition, high-speed rail is also more expensive than bullet train fares.

The power of high-speed rail** is electric traction.

1.In the past, trains were pulled by diesel locomotives, and only the locomotive was powered, and diesel fuel was burned. Today's EMUs and even high-speed railways have been fully electrified, and each carriage of the EMU has power, which is powered by a high-voltage catenary erected above the track, and the "pantograph" on the top of the locomotive will introduce the power into the high-power motor in the car, which converts the electric energy into power and pushes the train forward.

2.The top of each EMU is equipped with a pantograph, and the pantograph receives electric energy from the catenary, such as C pantograph receives high-voltage alternating current from the catenary, and is reduced to a lower alternating current through the main transformer installed on the undercarriage, and the alternating current after the step-down is converted into direct current through the converter on the grid side, and the direct current is then converted into a three-phase alternating current of variable frequency and variable voltage by the traction inverter and sent to the traction motor, and the electric energy is converted into the mechanical energy of the traction train. The electric unit adopts the composite braking mode, the EMU adopts electric braking, and the trailer adopts air brakingThe electric braking of the motor vehicle takes precedence, and when the electric braking in the low-speed area stops working or when the electric braking fails, the insufficient part is supplemented by the air brake.

3.The particularity of high-speed rail: its speed is 350 kilometers, drilling holes in the mountains, building bridges on the road, completely separated from the ground, not affected by the nature of the ground, and not affected by the complex human and animal influences, it is an independent unit, as long as there is a high-speed rail line, the whole process is isolated, and the line is laid on the cement pier, so that it is foolproof.