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This paper compared air gap and tolerance voltages correc-tion methods on high altitude area based on Sichuan-Tibet railway. With test results of short air gap in different areas of China, we verified the adaptability of insulation gap cor-rection method at an altitude of 4000 to 4500m. As a re-sult, we formulated a correction method and value of air external insulation under 50Hz overvoltage and lightning impulse overvoltage of 27.5kV traction power supply sys-tem at an altitude of 4000m to 4500m.
Analysis of air gap correction method for 27.5kV traction power supply system of Highland electrified railway. Ke Chen, Jia Yang, Jiayi Zhang, Jingwen Liang
