Urban railway transit rail to earth transition resistance testing system and method

Abstract

The invention relates to an urban railway transit rail to earth transition resistance testing system and method. A conventional urban railway transit rail to earth transition resistance testing system cannot meet requirement of on-site tests for low power and high precision. The urban railway transit rail to earth transition resistance testing system comprises a testing system host machine and a far end data collection and transmission device that are connected with each other for information interaction; the testing system host machine comprises a programmable control low power current source, an automatic control module, a digital type high precision voltage measurement and storage module I, a wireless communication module I, a data processing module and a man-machine interaction module; the far end data collection and transmission device comprises a device automatic control submodule, a digital high precision voltage measurement and storage module II and a wireless communication module II. The portable programmable low power current source is adopted in the urban railway transit rail to earth transition resistance testing system, testing operation can be performed conveniently, data of a plurality of testing points is synchronously transmitted and processed, rail to earth transition resistance is calculated via a compensation algorithm, and urban railway transit rail to earth transition resistance can be measured in a high precision manner.

Description

technical field [0001] The invention belongs to the technical field of railway electrics, and in particular relates to an urban rail transit rail-to-ground transition resistance testing system and a method thereof. Background technique [0002] The traction power supply system of my country's urban rail transit adopts DC power supply. The electric locomotive takes current from the traction substation through the catenary. Dissipate current. Stray current will seriously corrode buried metal pipelines, steel structure and tunnel-related facilities and buildings, and long-term corrosion will seriously endanger the safety of subway operation. Article 4.2.1 of CJJ49-92 "Technical Regulations for the Protection of Stray Current Corrosion in Subway" stipulates that the transition resistance value between the subway running rail and the main structure of the tunnel (or the earth) used as backflow (measured in sections according to the block interval) And converted to the resistance...

AI Technical Summary

Problems solved by technology

The site needs to provide an additional large-capacity DC power supply. The test process is complicated and requires the cooperation of multiple people to complete, which cannot meet the requirements for data simultaneity and accuracy in testing at multiple locations; the current flowing in the rail is difficult to measure directly, and it needs to be measured. The rail voltage drop of a certain length, and then divided by the rail resistance to calculate the rail current

In order to improve the measurement accuracy, the length of the rail in the pressure drop test section must be guaranteed; on the other hand, according to the evaluation requirements for stray current protection, it is generally necessary to measure the leakage resistance of the rail between two stations. It can be seen that it is difficult to obtain accurate test values ​​using this method

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