Based On The Stray Current Automatic Detection Of The Switching Power Supply And Dynamic Compensation Device

Metro stray current causes about seriously harmful electrochemical corrosion in subway rail, rebar in concrete main structure buried underground nearby metro, underground metal pipeline around the Metro, and buildings along the Metro. Up to now, passive "intercepting" and "channeling" safeguard procedures have been taken to prevent Metro stray current from harming and worked in a certain sense. However, the last goal has not been achieved. This article is mainly about a new method that is based on automatic detection and dynamic compensation, which deals with fields among electron, detection and buildings protection.The generation mechanism and harm of Metro stray current as well as present shelter measures are introduced in this paper. Besides, a positive preventing and treating project is put forward in a way to effectively reduce Metro stray current, by compensating stimulated the Metro trail current. The whole process of designing and establishing simulated device of Metro is also discussed; There some paragraphs are about detection circuit based on Dual Differential Comparators LM393.On the basis of analysis of types of power, a detailed introduction of circuit design based on UC3843 chip.Finally , six groups of experiment data are collected from stimulated subway rail, followed by a detailed analysis of every group's experiment result. The analyses results prove that the method is better than the others. All of those provide support to practical application.