Rail transit double-contact-rail power supply system

Abstract

The invention discloses a rail transit double-contact-rail power supply system. Contact rails are arranged on the left side and the right side of running rails of a rail vehicle, a power supply rail is arranged on one side while a return rail is arranged on the other side. During train operation, collector shoes on two sides of the rail vehicle are in contact movement with the contact rails mounted on the same sides and are connected with the rail vehicle through insulating supports. The left contact rail (power supply rail), the left collector shoe, a rail vehicle main circuit, the right collector shoe and the right contact rail (return rail) form a traction power supply loop. The collector shoes can be replaced by collector wheels to reduce wear and prolong service life of equipment. The double-contact-rail power supply system is an independent loop which is insulated from the running rails and the earth and supplies power to the rail vehicle main circuit, so that stray current and influences of long-term corrosion thereof are eliminated fundamentally. The double-contact-rail power supply system is convenient to mount, does not affect urban appearance and can be used for modification of existing rail transit lines as well as new construction of rail transit lines.

Description

technical field [0001] The invention relates to a rail transit double contact rail power supply system. Background technique [0002] Both electrified railways and urban rail transit traction power supply systems use running rails as the traction return system. Since the running rails are not completely insulated from the ground, the traction return current will leak to the ground and other objects through the running rails, resulting in stray currents, commonly known as stray. In particular, urban rail transit adopts DC traction, and the stray current generated by it will cause electrochemical corrosion to the steel structure of the ballast bed, the steel structure in the tunnel, and the metal pipelines along the line, thus affecting the safety and service life of these structures and metal facilities. . In addition, due to the return flow of the running rail, the potential difference generated by it to the ground may form a step voltage, threatening personal safety. [...

AI Technical Summary

Problems solved by technology

In particular, urban rail transit adopts DC traction, and the stray current generated by it will cause electrochemical corrosion to the steel structure of the ballast bed, the steel structure in the tunnel, and the metal pipelines along the line, thus affecting the safety and service life of these structures and metal facilities.

In addition, due to the use of running rail backflow, the potential difference generated by it to the ground may form a step voltage, threatening personal safety

[0003] The current corrosion protection measures for stray current mainly include drainage protection method, running rail resistance reduction method, stray current collection method and pipeline external coating method, etc., all of which require a lot of capital investment, and cannot fundamentally eliminate stray current and its long-term corrosion effects

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