Urban rail transit steel rail potential measuring method

An urban rail transit and potential measurement technology, applied in the field of engineering applications, can solve problems such as endangering personal and equipment safety, complex operating conditions, rail potential restrictions, etc., and achieve the effect of simple measurement method and good economy.

Inactive Publication Date: 2019-01-25
NANJING INST OF RAILWAY TECH
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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

Method used

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  • Urban rail transit steel rail potential measuring method

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Embodiment Construction

[0008] A method for measuring rail potential of urban rail transit according to the present invention will be further described below. The measurement method includes a computer, acquisition and analysis software, a voltage-current converter, a current-voltage converter, a high-precision acquisition card, a signal cable, a data line, and a 24V AC power supply; the voltage-current converter is connected to the base of the rail through a current , the other end is connected to the current-voltage converter through the cable, the other end of the current-voltage converter is connected to the input end of the high-precision acquisition card, the other end of the acquisition card is connected to the computer through the data line, the voltage-current transmitter and the current-voltage transmitter are both Power is provided by a 24V AC power supply. In actual engineering measurement, when the train stops running at night, choose to measure the track potential point, use the shielde...

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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...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R15/12
CPCG01R19/00G01R15/12
Inventor 杨飏
Owner NANJING INST OF RAILWAY TECH
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