Stray Current Switching Compensation Power Principle And Realization

Metro stray current causes serious electrochemical corrosion in the 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 in used 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 adopts switching supply power. It introduces the basic theory of switching supply power and topology selection, and explorers the process of design and realization of switching power in laboratory is also introduced in detail. As for the main part of switching power, in particular, more detail in the transformer design, PWM controller selection, and working theory. At last, analyzes the testing result.Through testing this system and analyzing the data, experiments proved that this switching power resolution meted the requirements. 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 and auto-compensating project in the further.