Four-track traction power supply device for urban transit

Abstract

The invention discloses a four-track traction power supply device for an urban transit. Two contact tracks are mounted on an overall insulating support in the vicinity of a vehicle walking track, andrespectively acted as a traction track and a backflow track which keep an insulation safe distance to each other. When a train runs, a traction shoe and a backflow shoes mounted on a vehicle steeringframe in an insulation manner are in contact running with corresponding traction track and the backflow track; a power anode of a traction substation, the traction track, the traction shoe, a vehicletraction main loop, the backflow shoe, a backflow track and a power cathode of the traction substation are formed to be a complete train traction power supply loop. The four-track traction power supply device adopts the installation method of the insulation combination of the traction track and the backflow track, thereby fundamentally removing the influence of long-term corrosion of stray currentby adopting the walking track backflow method and achieving the landscape requirements. Meanwhile, the four-track traction power supply device saves construction investment cost and has very obvioustechnical advantages and social benefits.

Description

technical field [0001] The invention relates to a four-rail traction power supply system for urban rail transit. Background technique [0002] Existing urban rail transit traction power supply systems generally use running rails to achieve traction return. Since it is difficult to completely insulate the running rails from the ground, the traction current does not all flow back to the traction substation through the running rails, but part of it is The running rail leaks to the ground, and then flows back from the ground to the running rail and returns to the traction substation. This part of the current is the stray current. [0003] The existence of stray currents will cause electrochemical corrosion to the steel structure of the track bed of the urban rail transit line, the steel structure of the tunnel and the metal pipelines along the line, thus affecting the safety and service life of these structures and metal facilities. [0004] The current stray current corrosion ...

AI Technical Summary

Problems solved by technology

[0003] The existence of stray currents will cause electrochemical corrosion to the steel structure of the track bed of the urban rail transit line, 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

[0004] The current stray current corrosion protection measures mainly include drainage protection method, walking rail resistance reduction method, stray current collection method and pipeline external coating method, etc., all of which require a large amount of capital investment, and cannot fundamentally eliminate the generation of stray current and its long-term corrosion effects

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