Study on Stray Current Protection for DC Traction System in Subway

The paper introduces the causes and harmfulness of the stray current generated by rail return mode DC traction system in subway and main protection measures need to be taken,and analyzes the existed problems in design,construction and operation of the stray current protection for domestic subways,points out the problems of corrosion prevention by taking drainage arrangement in domestic subways,puts forward the proposals for stray current protection for DC traction system of the domestic subways in terms of its design,construction and operation.