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System for reducing potential of subway train track

A technology for power supply systems and trains, applied in the direction of power rails, etc., can solve the problems of high resistivity, increase power supply costs, limit the power supply distance of traction substations, etc., to reduce the track potential, increase the power supply distance, and reduce voltage drop Effect

Active Publication Date: 2018-07-20
BEIJING JIAOTONG UNIV +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

Since the resistivity of the steel material of the running rail is relatively large, when a large current flows, the rail potential is too high, which will easily cause the rail potential limiting device to operate frequently
At the same time, the rise of the track potential also limits the power supply distance of the traction substation, seriously increasing the power supply cost of the entire system

Method used

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  • System for reducing potential of subway train track
  • System for reducing potential of subway train track
  • System for reducing potential of subway train track

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Embodiment Construction

[0050] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be emphasized that the following embodiments are merely exemplary, and are not intended to limit the scope of the present invention and its applications.

[0051] As shown in Figure 1(a) and (b), the existing DC traction power supply scheme 1, the rail transit DC power supply system adopts bilateral power supply, including: DC traction substation 1a and DC traction substation 1b, which are responsible for the transmission to train 4 Catenary (or receiving rail) 2 and running rail 3 of electric energy, wherein running rail 3 also serves as return line of DC traction substation 1a and DC traction substation 1b.

[0052] Both the positive terminals 11 of the DC traction substation 1a and the DC traction substation 1b are connected to the catenar...

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Abstract

The invention discloses a system for reducing potential of a subway train track. The system for reducing the potential of the subway train track comprises a return line, a negative impedence converterand a switch unit which is used for connecting the return line with a running rail. The system for reducing the potential of the subway train track is applied to the existing subway rail transit direct current traction power supply system; by adjusting output impedance of the negative impedence converter, the impedance from a return point of a traction substation to a closed switch unit via the negative impedence converter and the return line is enabled to approach zero and then the current of a train on the running rail in this section is transferred to the return line so that the potentialof the closed switch unit approaches the potential of the return point of the traction substation. According to the system for reducing the potential of the subway train track, the track potential inthe existing system can be greatly reduced to greatly reduce stray current corrosion. The system for reducing the potential of the subway train track can also be used for reducing the track potentialof a track in a novel direct current traction power supply system based on direct current auto-transformer power supply or can be used for reducing the track potential of a track in an alternating current traction power supply system.

Description

technical field [0001] The invention relates to the technical field of electrified rail transit and power electronic conversion, in particular to a system for reducing the rail potential of a subway train. Background technique [0002] With the development of power electronics technology, the electrified rail transit system gradually develops to high-voltage and high-power traction, and gradually evolves into trunk rail transit and urban rail transit. Today, as rail transit technology is becoming more and more mature, urban rail transit based on subways, as a transportation mode with large passenger capacity and high efficiency, has become the preferred solution for major cities to solve road congestion problems and improve development space. [0003] For urban rail transit, DC power supply is generally used. At present, countries in the world mainly use two voltage systems: one is 750VDC, and the other is 1500VDC. [0004] For trunk rail transit, there are both DC power su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60M1/30
CPCB60M1/30
Inventor 郑琼林杨晓峰王淼游小杰李虹黄先进
Owner BEIJING JIAOTONG UNIV
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