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为了对世界上海拔最高的高原输电工程——青藏直流联网工程的主设备状态进行更为准确有效的评估，该文对高海拔环境对高压直流输电主设备运行的影响展开研究，提出高海拔直流输电设备状态评估参数的修正方法。从理论上分析了高海拔下外绝缘强度、散热能力、紫外辐射、昼夜温差等方面对设备的影响，并基于相关性分析筛选出了高海拔下所需要修正的状态量。根据国网的状态评价导则以及低海拔地区的大量运行经验，建立了考虑高海拔条件的主设备运行 状态评价方法，对与海拔相关的状态量及其权系数进行了海拔修正。基于已建立的状态评价方法，建立了±400 kV青藏直流工程主设备远程评价体系。研究表明，海拔修正系数的引入能够有效提高高海拔地区直流输电设备状态评估的准确性。“,”ABSTRACT:In order to make a more accurate and effective assessment of the status of the main equipment of the±400kV Qingzang HVDC project, which is the world’s highest altitude transmission project, the impact of high altitude on the operation of HVDC equipment was studied, and the correction model of condition assessment of HVDC equipment was proposed. External insulation strength, heat-sinking capability, ultraviolet radiation, and temperature difference day and night in high altitude area were analyzed theoretically. The state parameters which need to be revised at high altitude were selected based on the correlation analysis. Referring to the Condition Evaluation Guide established by State Grid, the weight of the condition variables related to altitude was revised, and the evaluation method for HVDC equipment in high altitude area was proposed. The remote condition monitoring and operation condition evaluation system for primary equipment of±400kV Qingzang HVDC project was established in the mode of concentrated construction. It is demonstrated that the altitude correction factors can effectively improve the accuracy of condition assessment of HVDC equipment operation in high altitude.