A railway is a track line used by trains and other means of transportationLarge transportation capacity, resource saving, environmental protectionIt is an important infrastructure of the country, and it is also the main artery of the national economy and the backbone of the transportation system. According to the traction power**, the railway is divided into non-electrified railway and electrified railway. Electrified railways are railways that use electric locomotives as the basic traction force, and have the advantages of large transportation capacity, fast travel speed, low energy consumption and low operating costs, and electrified railways have become the mainstream development direction of railways. The electrified railway is composed of two main parts: the electric locomotive and the traction power supply system, the train traction power is realized by the electric locomotive, the locomotive itself does not carry energy, and the required energy is provided by the traction power supply system. The traction power supply system is mainly composed of two parts: traction substation and traction network.
The relationship between the power base and the traction power supply system in the electrified railway is shown in the following figure:
The traction substation sends the electrical energy from the power system through the high-voltage transmission line to the traction network over the railway. The traction network is composed of a feeder, a catenary and a reflow network. The catenary is the core of the traction network, which is responsible for the direct transmission of electrical energy to the electric locomotive, and can be seen as the artery 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 catenary is composed of catenary wires and catenary products, because there are many types of catenary products, involving power transmission and transformation, machinery manufacturing and other subdivided industries, and the key products in the catenary products are the core of the catenary system, and its quality and performance directly determine the stability of the catenary system, so China has licensed the production and sales of important catenary products.
Electrified railway catenary products are mainly placed on both sides of the railway in the suspension mode, and the suspension mode is mainly divided into two types: flexible suspension and rigid suspension. At present, the chain suspension method in flexible suspension is the mainstream method in the industry.
The chain suspension reduces the relaxation of the contact line in the middle of the span, improves the elasticity, increases the suspension weight, and improves the stability, which can meet the requirements of the high-speed operation of the electric locomotive. In addition to the chain suspension method, rigid suspension catenary products such as busbars are also used in electrified railways in tunnels and other environments. Electrified railway catenary products need to adapt to the requirements of electrified railway driving at different speeds, and can be divided into catenary products used in high-speed railways and catenary products of other lines.
The high-speed railway has high running speed and high tension, high requirements for the technical level and performance stability of catenary products, complex product manufacturing process and strict inspection, so high-speed railway catenary products represent the highest technical level in the industry.