Stray Current Computer Detection System Design

In the D.C tractive power supply system, part of tractive current flowed into the earth though the rail, and then returned to the tractive substation though the earth and rail,this part of tractive current is called stray current. In the long-term corrosive effect of stray current, the underground metal objects will be seriously damaged. Sometimes it will be danger to people's lives, so the research on multifunctional and multi-parametric stray current detective system is significant for practical application.In this paper, the research situation of stray current detection at home and broad, the cause and the detection method of stray current were introduced, and the distributed computer detective system based on the Can bus was designed. This system was composed by upper compute, Can bus and smart stray current detector. The designs of signal collection circuit, storage and display circuit, clock circuit, telecommunication circuit were discussed in detail. The application procedure of every part was written based on the assembly language. The CAN application layer agreement and procedure was designed based on the CAN2.0 standard. Superior PC used PCI5121 as the CAN bus interface card and designed application software with VB programming language. This software realized data communication, data management, trend curve and other functions. The man-machine contact surface of this software was friendly and the function was perfect, it can satisfy the needs of practical application.The design of computer monitoring system of stray current will have positive significance to find the hidden trouble to safety timely, exclude the stray current reasonable and reduce the hazards of stray current corrosion.