CAJ | 학술논문

目前，±1100 kV是世界上直流输电中最高的电压等级。±1100 kV直流换流阀作为核心设备，确定其外绝缘在不同海拔高度所需要的室内最小空气间隙距离有重要意义。在北京特高压直流试验基地对中电普瑞 A5000系列产品的±1100 kV特高压直流换流阀外绝缘进行了对虚拟墙和虚拟地的操作冲击放电试验，得到相应操作冲击放电特性曲线。由于现有条件不能满足在高海拔地区进行换流阀外绝缘的操作冲击试验，需要根据已有对长空气间隙进行的高海拔操作冲击试验研究结果，结合以往对海拔校正因数的研究，探讨和提取适用于±1100 kV特高压直流换流阀外绝缘的海拔校正因数。最后依据在北京试验得到的±1100 kV换流阀外绝缘操作冲击放电特性曲线计算了其在不同海拔高度下所需要的最小空气间隙距离。
목전，±1100 kV시세계상직류수전중최고적전압등급。±1100 kV직류환류벌작위핵심설비，학정기외절연재불동해발고도소수요적실내최소공기간극거리유중요의의。재북경특고압직류시험기지대중전보서 A5000계렬산품적±1100 kV특고압직류환류벌외절연진행료대허의장화허의지적조작충격방전시험，득도상응조작충격방전특성곡선。유우현유조건불능만족재고해발지구진행환류벌외절연적조작충격시험，수요근거이유대장공기간극진행적고해발조작충격시험연구결과，결합이왕대해발교정인수적연구，탐토화제취괄용우±1100 kV특고압직류환류벌외절연적해발교정인수。최후의거재북경시험득도적±1100 kV환류벌외절연조작충격방전특성곡선계산료기재불동해발고도하소수요적최소공기간극거리。
At present, ±1 100 kV is the highest HVDC voltage level in the world. ±1 100 kV HVDC converter valve is a core equipment, and the minimum indoor air gap distance for its external insulation at different altitudes is very important. In this paper, the C-EPRI’s A5000 series ±1 100 kV HVDC converter valve installation was used to carry out switching impulse tests at the SGCC UHVDC test base in Beijing. A switching impulse flashover characteristics curve was acquired. Due to limited conditions, the switching impulse flashover test of converter valve external insulation at high altitude cannot be completed. According to the long air gap switching impulse test results and the previous studies of altitude correction factors referred, the discussion and extraction of the altitude correction factor that is suitable for ±1 100 kV HVDC converter valve external insulation was made in the paper. The minimum air gap distances that are required for a ±1 100 kV HVDC converter valve installation at the defined operating overvoltage levels were calculated for different altitudes according to the switching impulse flashover characteristics curve obtained.