Research on the Magnetic Blowing of Lowering Pantograph Arc Extinguishing Under Low Air Pressure

High-speed train is an important artery for global economic development and is widely built all over the world. When the train lowers the pantograph, the pantograph is separated from the catenary, resulting in the occurrence of the arch network arc, which causes ablation damage to catenary and pantograph. This shortens the service life of the Pantograph catenary system and endangers operational safety. Especially in low pressure environments, the ablative effect of pantograph arc will be further expanded. It is necessary to suppress the development of the low-pressure lowering pantograph arc. And based on arc chain model, a pantograph arc simulation model considering low air pressure environment and applied magnetic field is constructed. A low-pressure pantograph arc experimental platform was established to collect data on the effect of magnetic blowing arc extinguishing. The effectiveness of the model is verified experimentally, and it is found that the arc maintenance duration is shortened by 96% under the action of applied magnetic field. Based on the model, simulation results show that the maintenance time of arc decreases with the air pressure and magnetic field. The arc root movement distance increases with the air pressure, and first decreases and then increases with the magnetic field. It shows that there is the best value of the magnetic blowing effect under low pressure, and the best arc extinguishing effect can be achieved by selecting the appropriate magnetic field value, which provides a research basis for suppressing the lowering pantograph arc with low pressure.