What knowledge does railway electrochemistry know, and what physics knowledge is used?

Railway electrification refers to the technical transformation of railway lines that were originally pulled by steam locomotives or diesel locomotives into electric traction, or the construction of new lines for electric traction at one time. It is an important part of modernizing railways. Electrified traction is a type of powerful traction that has a greater traction force than not only steam locomotives, but also diesel locomotives.

Its technical speed is generally 20 30 higher than that of steam locomotives, and advanced electric locomotives can make passenger trains reach speeds of up to 170 210 kilometers per hour, thus greatly increasing the passing capacity and transportation capacity. Electrified traction is suitable for use on trunk lines and mountain routes with heavy passenger and freight transportation. The more complex the terrain and the larger the slope limit, the more prominent the superiority of the electric locomotive.

The traction power of the electrified railway is an electric locomotive, which does not carry energy itself, and the required energy is provided by the electric traction power supply system. The traction power supply system mainly refers to the two major parts of the traction substation and the catenary. The substation is located near the railway, and it sends the current from the power plant through the high-voltage transmission line to the catenary over the railway.

A catenary is a device that directly transmits electrical energy to an electric locomotive. Along both sides of the railway line, a row of pillars is erected, on which metal wires are suspended, that is, catenary, which can also be seen as the arteries of the electrified railway. The electric locomotive uses the pantograph on the roof of the car to obtain electrical energy from the catenary and pull the train for operation.

The traction power supply system is based on the current system of the catenary, and there are two types: DC system and AC system. The direct current system is to supply direct current to the catenary after the high-voltage and three-phase power is downgraded and rectified in the traction substation, which is the earliest current system in the development and has been less used after the 50s of the 20th century. The AC system is to supply alternating current to the catenary after the high-voltage and three-phase power is downgraded and turned into a single-phase power in the substation.

The AC system has a high supply voltage and is developing rapidly. The traction power supply system of China's electrified railway adopts single-phase power frequency (50 Hz) 25 thousand volt AC system from the beginning, which is conducive to the development of electrified railways in the future.

It's hard to say, but it's not too hard, as long as you have faith and get interested in it, it's easy. Interest is the best teacher.

I don't think it's difficult, but it's not very good on the railroad now, and if you go to that school regardless of the assignment, it's useless to go to it.

Electrified railways are mainly composed of electric locomotives, traction substations, and catenary.

Electrified railways, referred to as electrified railways, refer to railways that can run with electric power trains, and are named because they need to be equipped with corresponding electrification equipment along the lines of such railways to provide power guarantee for trains.

Electrified railways came about with the advent of electric locomotives, because electric locomotives do not carry their own energy, and they need the power supply system along the railway to continuously transmit electrical energy to drive the vehicles. Because electric locomotives have a stronger capacity advantage than diesel locomotives, the transportation capacity of electrified railways at the same scale far exceeds that of non-electrified railways, and has become the mainstream type of modern railways.

Electrified railways are widely used in the construction of high-speed railways and urban rail transit, and many non-electrified railways have been upgraded and upgraded one after another. However, the construction of electrified railways is demanding and difficult, and it is not suitable for some special geographical environments, so electrified railways cannot completely replace non-electrified railways.