The Influence of Urban Rail Transit’s Stray Current on Power Grid and Its Synchronous Monitoring

Although many researchers have carried out researches on rail transit stray current and DC magnetic bias of power grid, they are only focused on DC bias of power grid side or stray current of Metro side. There is a lack of synchronous monitoring and correlation analysis of stray current at Metro side and DC bias of power grid side. In this paper, a synchronous monitoring scheme has been proposed. The number of sensors needed for measuring has been reduced according to the current sharing coefficient. The composition of synchronous monitoring system has also been given. In future, correlation analysis will be carried out to verify the influence of stray current on power gird.