Research On The Calculation Of Air Clearance In The Valve Hall Of A Converter Station Under Ultra-High Altitude Conditions

To ensure the reasonable and safe electrical layout for converter stations, appropriate air clearance must be determined. At high altitudes, air clearance design has a significant impact. The g parameter method which is commonly used for adjusting non-standard meteorological conditions, is applicable only when the altitude is below 2000 m. With the development of HVDC technology, many converter stations are located above 2000 m, some even over 4000 m. The national standard GB/T 42001-2022 provides additional altitude correction methods for systems above 2000 m, but detailed analysis is lacking. This paper calibrates air clearance for altitudes of $2880 \mathrm{~m}, 3000 \mathrm{~m}, 4000 \mathrm{~m}$, and 4500 m based on the g parameter method and GB/T 420012022, and compares the differences to provide a reference for high-altitude HVDC converter station design.