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研究高海拔沙尘条件下750 kV输电线路电晕损失特性。西北地区沙尘天气频发，沙尘颗粒存在可能会影响750kV输电线路导线电晕损失特性。基于可移动电晕笼，针对750 kV输电线路实际使用的6分裂LGJ400-50导线展开模拟沙尘条件下导线电晕损失特性试验研究，采用光纤数字化电晕损失测量系统测量导线的电晕损失，采用紫外成像仪观察放电强度。从风速，沙尘浓度，沙尘颗粒度方面分析沙尘条件对电晕损失的影响。结果表明：沙尘条件下电晕放电增强；在文中的风速范围内，风速对导线交流电晕损失影响较小；在文中的沙尘浓度和颗粒度范围内，750kV 输电线路导线电晕损失随着沙尘浓度及沙粒颗粒度的增加而增大。“,”An investigation of corona loss characteristics of the 750kV bundle conductors in high altitude sandy condition was presented in this paper. Sand particles may influence corona loss characteristics of the bundle conductors of 750kV power transmission lines in Northwestern China, where sandy weather often occurs. Corona loss and discharge intensity of the conductors used in practice LGJ400-50 of the 750kV power transmission lines is measured with fiber-optic corona loss measurement system and UV detector based on the movable corona cage in simulated sandy weather conditions. Corona loss characteristics are analyzed as influenced by wind speed, sand concentration and sand particle size. The test results show that corona discharge becomes stronger in sandy condition. Wind speed in this paper has little influence on corona loss. Corona loss of 750kV power transmission line conductor is found to increase with sand concentration and sand particle size in this paper, when the other parameters are fixed.