Urban rail transit steel rail potential measuring method

Abstract

The invention provides an urban rail transit steel rail potential measuring method. According to the method, a voltage-to-current converter, a current-to-voltage converter, a high-precision data acquisition card, a computer, and an alternating-current power supply are adopted, wherein the voltage-to-current converter is connected with a steel rail. With the measurement method adopted, the problemthat the field measurement of the potential-to-ground of the steel rail at the power supply interval of urban rail transit due to daytime vehicle operation can be solved; a potential between the steelrail and the ground can be measured, and measurement data can be recorded; and therefore, the method is of great significance for clarifying the potential abnormal distribution of the urban rail transit.

Description

technical field [0001] The invention relates to a method for measuring rail potential in urban rail transit, belonging to the field of engineering applications. Background technique [0002] my country's urban rail transit uses DC power supply, and most of them use DC1500V traction power supply system. The positive pole of the substation feeds the traction current to the catenary power supply bus to take the current, and the current finally flows back to the traction substation through the parallel circuit between the rail and the ground. However, due to the influence of the impedance of the rail itself and the leakage of stray current, a potential difference will be generated between the rail and the ground, endangering the safety of people and equipment. Due to the complex operating conditions of urban rail transit lines, there is always the problem of abnormal rise in rail potential, resulting in frequent permanent grounding of rail potential limiting devices. As a resul...

AI Technical Summary

Problems solved by technology

However, due to the influence of the impedance of the rail itself and the leakage of stray current, a potential difference will be generated between the rail and the ground, endangering the safety of people and equipment

Due to the complex operating conditions of urban rail transit lines, there is always the problem of abnormal rise in rail potential, resulting in frequent permanent grounding of rail potential limiting devices

As a result, a large amount of track current leaks to the ground to form stray current, which causes serious corrosion to the underground metal steel structure network

Abnormal parameters of the subway return system and simultaneous start-up of multiple locomotives in the same section can easily cause an abnormal rise in rail potential and lead to rail potential limit action

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