Electromagnetic Radiation Test and Research of High-speed Railway EMUs under Different Operating Conditions

Due to the power supply division and the mechanical structure of catenary, there are three different operating conditions of electric multiple units (EMUs) of China’s Railway High-speed (CRH), which are the common section of catenary, the common anchor joint of catenary, and the electric phase division anchor joint of catenary. This paper has extensively tested and studied the electromagnetic interference (EMI) caused by EMUs under these three different operating conditions. It is proposed that the electromagnetic radiation (EMR) value is small when the EMUs pass through the common section and the common anchor joint, which is mainly caused by the on-board equipment, and the frequency band is 0.9-100MHz. However, due to the arc caused by the pantograph gliding from the power area to no-power area of the catenary at the anchor joint of the electric phase division, the EMR is very large, and the frequency band is 0.9-1200MHz. In the conclusion, suggestions are put forward for the construction of signal broadcasting equipment and airport navigation equipment around the railway: The interfered equipment and the electrical phase separation point of the railway should be kept at a safe distance of more than 6 km, and the electromagnetic shielding network should be added to protect it if necessary.