Harmonic Frequency Test of Track Circuit’s Return Current According to Electrical Rolling-Stock Operation

Electric power used in electrical vehicles flows into the substation through the feedback circuit, track circuit. Due to this power conversion equipment in electrical railroads, return current contains harmonics, and it should not affect other communication lines. In this paper, based on the return currents, we measured harmonics and analyzed an influence in railway equipment due to the harmonics. For analysis, we utilize the measured values of return currents measured in track circuits, and predictive values of those compared to the earth methods between the existing electrified sections. Applying the regulations used for Gyeongbu HSL(High Speed Line), the results of measured harmonics have found to be acceptable.