Analysis of EMI from Pantograph-catenary Arc on Speed Sensor Based on the High-speed Train Model

-There will be the pantograph-catenary arc (PCA) when the pantograph of a high-speed train is separated from the power supply line, and the electromagnetic interference (EMI) caused by the PCA can affect speed sensors of the train. To study the influence of the PCA, firstly, the traction control unit (TCU) speed sensor of the high-speed train is researched. The result shows both overvoltage and electromagnetic radiation (EMR) generated by the PCA can influence the signal of speed sensor. Secondly, the composite model of the train is established. Then, the interference of the PCA on the TCU speed sensor is verified. The results of practical measurements show the PCA causes a maximum overvoltage of 680 V on train body (TB) and increases the magnetic field around TB to a maximum of 58 dB?A/m. This is the reason of sensor malfunction, which is consistent with the theoretical and simulation results. Finally, the methods to reduce the EMI of the PCA are proposed.