Modeling the Electromagnetic Influence of Traction Current on Audio-Frequency Track Circuits

This paper addresses the challenge of ensuring electromagnetic compatibility between traction power supply systems and railway signaling systems by promptly identifying the causes of excessive interference in track circuits. Track circuits serve as the primary train position sensor in most existing railway signaling systems. Harmonics of the return traction current, flowing along the rails from the rolling stock to the traction substation, can distort the track circuit signal and, under certain conditions, lead to failures in train control systems. To maintain electromagnetic compatibility, new train types are tested before entering permanent operation to ensure their electromagnetic interference remains within acceptable limits. Additionally, during operation, the signal current parameters in the rails are periodically monitored. However, when excessive deviations from standard values are detected, identifying the root cause can be challenging due to the large number of influencing factors. Modeling the electromagnetic impact of traction currents on audio-frequency track circuits reduces the need for complex real-world measurements and, in some cases, can even replace them. This work aims to develop a computer model of the electromagnetic impact of traction currents on audio-frequency track circuits, facilitating the identification of possible causes of parameter deviations from standard values.