The electrified railway traction transformer introduced by the high-voltage ring main unit manufacturer
Applications of electrified railway traction transformers
The electrified railway is composed of an electric locomotive and a traction power supply device, and the traction power supply device is generally divided into two parts: the traction substation and the catenary, so people also call the electric locomotive, the traction substation and the catenary as the "three major elements" of the electrified railway.
A catenary is a transmission line in the form of power supply to electric locomotives erected over the railway line. It is composed of several parts: contact suspension, support device, positioning device, pillar and foundation.
Contact suspension includes contact wires, hanging strings, load-bearing cables, and connecting parts. The contact suspension is erected on the pillar by means of a support device, and its function is to transmit the electrical energy obtained from the traction substation to the electric locomotive.
The function of the traction substation is to convert the three-phase 110KV (or 220KV) high-voltage alternating current into two single-phase 27.5KV alternating current, and then supply power to the catenary (rated voltage of 25KV) in the two directions of the railway up and down, and the catenary on each side of the traction substation is called the power supply arm.
Traction substation external power supply
The traction power supply system is generally supplied by a power system with a larger capacity other than the railway. There are many kinds of power level networks and equipment in the power system, among which the transmission lines of 110KV and above voltage levels are linked by transformers in regional substations, which are mainly used to transmit strong power, and use them to transmit power to the traction substations of electrified railways, and supply power traction force. In order to ensure the reliability of power supply, the high-voltage transmission lines sent by the power system to the traction substation are without exception double-loop. The two double circuits are each other's standby, usually in a live state, once a circuit power supply failure, the other circuit is automatically put in, so as to ensure uninterrupted power supply.
The main wiring of the traction substation
In order to complete the work of receiving electric energy, high voltage and distributing electric energy, the electrical wiring of traction substations (including zoning pavilions, opening and closing stations, AT stations, etc.) can be divided into two parts: primary wiring (main wiring) and secondary wiring.
The main wiring refers to the connection mode of the primary main equipment (i.e., high-voltage and high-current equipment) in the traction substation, and the traction transformer is also the channel for the substation to receive electric energy, transform voltage and distribute electric energy. It reflects the basic structure and function of the traction substation.
Secondary wiring refers to the connection mode of secondary equipment (i.e., equipment with low voltage and weak current) in the traction substation. Its function is to control, monitor, measure, and realize relay protection and movement of the equipment in the main wiring. The secondary wiring plays an important role in the safe and reliable operation of the primary main equipment.
