Study on Radiation Interference From Pantographcatenary Detachment Arc in AC Electrified Railway Considering the Influence of Train Speed

The pantograph-catenary system, comprising the pantograph and contact wire, plays a critical role in providing traction power to AC electrified railway train through a sliding contact. However, pantograph detachment can lead to arc formation, which generates intense broadband electromagnetic radiation, posing significant electromagnetic compatibility challenges. As train speeds increase, the arc radiation characteristics become more pronounced. This study proposes an evaluation method for arc radiation interference in the pantograph-catenary system, combining both modeling and field testing. A detailed traction power system model, incorporating pantograph detachment arcs, is developed using ATP-EMTP software, with arc parameters adjusted for varying train speeds. The relationship between arc current, electric field strength, and train speed is derived, and the electric field characteristics are extracted from the simulated arc currents. Field tests are then conducted, and a modified least squares algorithm is employed to fit the amplitude-frequency characteristics of the measured radiated electric fields. The validity of the proposed evaluation method is verified, and the influence of train speed on radiation intensity is analyzed. The interference impact on airport communication systems is selected as a case study, with results demonstrating that at <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$250 ~\text{km} / \mathrm{h}$</tex>, the radiation interference complies with electromagnetic compatibility standards.