Device for monitoring stray current of novel subway

Abstract

Novel subway stray current automatic monitoring system comprises that a plurality of stray current online automatic monitoring devices which are utilized as local monitoring slave machines are connected with a remote monitoring main machine. A switch power module, a data collecting module, an Ethernet communication module, an auxiliary hardware module and a man-machine interactive module are arranged on the same PCB printing circuit board around the processor of the system. The switch power module is internally-equipped with an EMC filter with high-performance. A / D transformation circuit employs bipolar and 12 bit A / D transducer MAX197 which is internally equipped with 8 ways sample-taking passages. The auxiliary hardware module comprises an EEPROM secondary permanent storage module, a hardware watchdog circuit, a self-contained battery calendar clock module and a serial port communication interface circuit. The invention simplifies the structure of the system, enables data sharing, information fusion and synergic observation among slave machines, which greatly strengthens the accuracy and tightness of the monitoring of the stray current, additionally, the cost of the monitoring device is reduced.

Description

technical field [0001] The invention belongs to the field of electrical measurement, and relates to a stray current monitoring device for urban running rails, in particular to a device capable of realizing on-line automatic monitoring of stray current changes in a subway system. Background technique [0002] It is difficult to directly measure the stray current in the subway system, and indirect measurement is generally used to reflect the corrosion of stray current. The risk index of stray current corrosion of structural steel and metal equipment in subway systems is determined by the current density flowing from the surface of the structural steel to the surrounding electrolyte and the resulting potential polarization shift. The current density is difficult to measure directly, and can only be judged by measuring the potential polarization shift. At the same time, the stray current of the subway has a certain periodicity and randomness, and stray current electrochemical c...

AI Technical Summary

Problems solved by technology

The manual measurement method cannot accurately and timely collect the real stray current, and the real-time performance is poor. Coupled with the intermittent operation of subway trains and the gradual process of metal electrochemical corrosion, the obtained data cannot truly reflect the change of stray current and the degree of corrosion.

In terms of online automatic monitoring, a lot of research has been carried out at home and abroad. At present, similar products have single functions, complex systems, and high application costs; in terms of communication processing, the traditional master-slave method is adopted, that is, the upper computer is the center. The collection command is sent to the monitoring device, and the collected data is uploaded to the remote background computer for processing

The biggest disadvantage of this communication method is that each communication must be initiated by the upper computer, the data in the monitoring device cannot be actively uploaded to the upper computer, the system has poor fault tolerance and real-time performance

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