Collection device for subway stray current

Abstract

The invention provides a collection device for a subway stray current. The collection device comprises an AC / DC module, a first voltage acquisition circuit, a second voltage acquisition circuit, an ADC module, a CPU and a 485 isolation circuit. The AC / DC module connected with an external alternating-current power supply converts an alternating-current voltage signal into a direct-current voltage signal and provides the direct-current voltage signal for the ADC module and the CPU. The first voltage acquisition circuit is connected with a reference electrode; and the second voltage acquisition circuit is connected with a subway track. The ADC module is used for converting the reference voltage signal and the subway track voltage signal into two paths of digital signals respectively and transmitting the signals to the CPU. The CPU compares the two paths of digital signals to carry out logical operation and transmits the operation result to an external electric drainage cabinet by the 485 isolation circuit. According to the invention, the reference electrode signal and the subway track voltage signal are collected and compared to identify the subway stray current amplitude and the identification result is sent to the external drainage system, so that the stray current can be drained timely and thus the stable operation of the subway is guaranteed.

Description

technical field [0001] The invention relates to the field of subway stray current monitoring, in particular to a subway stray current acquisition device. Background technique [0002] The power supply system of urban rail transit generally adopts DC power supply, and the track is used as the return path. Because of the DC power supply, with the operation of urban rail transit, the track cannot be absolutely insulated from the ground, so some current leaks from the track to the formation, and this part of the current is called stray current. [0003] The stray current of the subway is a kind of harmful current. The stray current will cause serious electrochemical corrosion to the steel bars in the concrete structure of the tunnel, viaduct and ballast bed, as well as the buried metal pipelines along the subway and other metal conductors buried in the subway. The stray current flows into the metal conductor, and the ground potential of the metal conductor is negative, which is...

AI Technical Summary

Problems solved by technology

Therefore, stray current corrosion will seriously shorten the service life of the track system, destroy the concrete structure and reduce its bonding strength and durability, cause safety accidents, affect the safe operation of the subway, and endanger the personal safety of passengers

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