Simulation Stray Current Automatic Monitoring System In The Current Measurement Techniques

Metro stray current causes serious electrochemical corrosion in metal pipelines, communication cable epidermis and rebars in concrete main structure buried underground nearby metro. Now the protection methods of metro stray current adopted in our country or abroad are almost passive. Though the monitoring systems of metro stray current and artificial protection work have been used and done in many cities, the efficient and automatic protection method has not been found. How to adopt active and effective protection method of metro stray current, to eliminate the resource of its generation and find good coalition between monitoring and auto-protecting is an important research problem involved in the research areas of electronics, auto-testing system and electrochemical corrosion protection.This paper introduces the generation mechanism and damages of metro stray current, and the protection methods now adopted in metro. Then a new protection project is expounded, which can protect metro stray current by means of monitoring and auto-compensating with power supply. The process of design and realization of metro modeling in laboratory is also introduced in particularly. Based on analyzing the methods of current testing, this paper explicates the design and parameter option process of testing circuit in model's current auto-testing system. The computer user interface is also summarized. In the end of this paper, a detail analysis of the metro stray current condition in physical metro model and experiment data is .given.Through debugging this system and analyzing the data, experiments have proved that this physical model has reflected the current distribution in the metro rail, and the design of testing circuit in its auto-testing system has realized the current testing timely and efficiently. And this system's linearity and stability are very good. So it can satisfy the need of research work, which would provide the experiment basis and data for the research of attesting the efficiency of the monitoring andauto-compensating project in the further.