Traction power supply system backflow state identification method and device

Abstract

The invention relates to a traction power supply system backflow state identification method and device. The method comprises the following steps: determining real-time current of each path of traction backflow in a traction substation, an AT station and a section station; establishing traction backflow actual measurement data matrixes of the traction substation, the AT station and the section station on the basis of the traction backflow path real-time currents for n consecutive seconds, wherein n is a positive integer; based on the traction backflow actual measurement data matrix, calculating the ratio of the sum of traction backflow numerical values to the traction load; judging whether the ratio meets a threshold range or not; and if not, determining that the traction power supply system is abnormal in backflow or fails. According to the technical scheme provided by the embodiment of the invention, the backflow state of the traction power supply system can be detected, and equipment damage and safety accidents caused by abnormal traction backflow can be reduced.

Description

technical field [0001] The disclosure relates to the technical field of traction power supply backflow for electrified railways, and in particular to a method and device for identifying the backflow state of a traction power supply system. Background technique [0002] In recent years, the mileage of electrified railways has developed rapidly. Electric traction is a power traction method that can replace oil with electricity among various transportation methods, and its energy advantages are very obvious. The traction return system is an indispensable key component of the high-speed railway traction power supply system. The current traction return system is mainly composed of overhead return, rail return and ground return. The overhead return line undertakes most of the traction current return tasks, the rails take into account both the traction return and the track circuit, and the ground return is a part of the traction return. [0003] Due to the common influence of many...

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Problems solved by technology

In addition, after the high-speed railway is put into operation, the traffic density gradually increases, which leads to a significant increase in the current when the traction load and short-circuit fault occur, and the excessive backflow of the ground network of the traction substation will bring many potential safety hazards, the most important ones are as follows These two aspects: one is to increase the risk of overheating and burning of the grounding grid in the institute, and at the same time, it will also accelerate the corrosion rate of the grounding grid in the institute, which will reduce the overall flow capacity of the grounding grid, and the grounding resistance of the grounding grid will increase. It will affect the safe operation of the traction power supply equipment in the substation; the second is to increase the local ground potential in the substation, which will lead to an increase in the step voltage and bring hidden dangers to the life safety of the personnel in the traction substation

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