A Study on the Real Time Measuring Technique of Return Current in the DC Railway System

초록

This paper presents the real time technique of monitoring stray current on the DC railway system. The system is made up of units that measure the current flowing through the cable which connects running rails with the negative pole, the current returning from the ground mat, the electric potential of the rail, and the current returning from leakage current-collecting mats. In this technique, the leakage current of each point can be estimated, and can find the place of insulation aging. In addition, the damage on electro-chemical corrosion of underground metal infrastructure caused by leakage current can be prevented.