Three-phase traction electricity supplying system

Abstract

The invention provides a three-phase traction electricity supplying system, and relates to the field of urban rail and trunk line railway traction electricity supplying. The secondary edge of a main substation feeds out a three-phase cable; the three-phase cable is parallel to a three-phase traction net; a traction transformer Ti adopts Y / d wiring, the original edge is connected with the three-phase cable, and the secondary edge is connected with the three-phase traction net; the three-phase traction net is composed of a first electricity supplying rail, a second electricity supplying rail anda steel rail which are insulated with one another; the traction transformer Ti adopts the Y / d wiring, the original edge Y wiring of the traction transformer is connected into ABC with the same phase,and three terminals of the secondary edge d wiring of the traction transformer are connected with the first electricity supplying rail, the second electricity supplying rail and the steel rail correspondingly; and a vehicle-mounted electricity supplying system is composed of a vehicle-mounted cable and a three-phase AC-DC-AC convertor, a first single core cable, a second single core cable and a ground wire of the vehicle-mounted cable make contact with the first electricity supplying rail for being energized through an electricity brush, the second single core cable makes contact with the second electricity supply rail for being energized through an electricity brush, the ground wire makes contact with the steel rail for being energized through an electricity brush, and electricity is supplied to the three-phase AC-DC-AC convertor and a three-phase motor.

Description

technical field [0001] The invention relates to the field of traction power supply for urban rails and trunk railways. Background technique [0002] In the case of the same power supply capacity (capacity), three-phase generators, motors, transformers, and transmission lines are more material-saving than the manufacture and construction of single similar components, and the structure is simple, the performance is excellent, and the instantaneous value of the three-phase electric power is maintained. Constant, so three-phase alternating current has been widely used in industry. [0003] It can be understood that the earliest ideal tram was to try three-phase power supply. As early as the late 18th century, tram lines with three overhead lines above the tram appeared in Europe, and tram lines with two overhead lines above the tram were also tried. A 2 134m long tram line was built between the Lichtefeld Station and the Military Academy. In the same year, the first 400m long ...

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Problems solved by technology

[0009] The applicant also proposed "a rail transit three-phase AC power supply structure (ZL 2105 2 0275380.0)", which belongs to a three-phase AC power supply system, although compared with "a rail transit power supply structure (ZL201510213833.5)", it can perform The advantages of three-phase AC power supply, but it needs to add a third power supply rail, which increases the complexity of the contact structure and increases the investment

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