External Insulation Design for EMUs’ Insulators at High Altitude with Non-Uniform Distributed Pollution

Under operation pollution accumulates on the surface of High-speed EMUs, and the flashover can occur frequently along the insulator, especially if the EMU is operating on a high-altitude line. To solve the problem, this paper combines the characteristics of high-altitude and lowpressure operating environment of Lanzhou-Xin Line in China with the operational requirements of high-speed railroad. This paper proposes the calculation method of insulator withstand voltage under the condition of non-uniform fouling distribution of high-speed airflow, and gives the design and test verification of insulator support insulator for 3500km altitude. The design and test verification of the supporting insulator of the rolling stock applicable to 3500 km altitude are presented. The result show that the insulator should be reliable operation on 4430km high altitude area if the insulator structure height is 430mm, the creep distance is 1250mm. The anti-pollution performance is fine in high speed wind if the radiuses of the large and small shed of the insulator are 196mm and 145mm respectively and the shed spacing is 45mm. The 50Hz withstand voltage of the developed insulator is 131kV and the light impulse voltage is 22SkV is suitable for lines running on 3500m. This research provides a theoretical basis and data to support the safety of high-speed rolling stock in high altitude areas.