【摘要】 为了系统研究复合支柱绝缘子在高海拔条件下的直流污闪和污雨闪性能,在海拔1.97 km的地区,对5种不同伞形参数的复合支柱绝缘子进行了人工污秽直流污闪和淋雨试验。试验结果表明:同等污秽条件下,污雨闪电压明显高于污闪电压。在一定范围内,伞形参数对电压的影响呈现出规律性:伞伸出增大,两种电压均增大;伞间距增大,污闪电压随之增大而污雨闪电压则先升后降;芯棒直径的增加会造成两种电压的降低。因此,高海拔地区直流变电站外绝缘设计可仅依据污闪特性进行配置,同时,合理地优化伞裙参数可提高污闪性能25%以上。更多还原

【Abstract】 The pollution flashover and rain flashover of composite post insulators at high altitudes were evaluated for five types of composite insulators with different structures in natural high altitude(1 970 m) environment.The study shows that the pollution flashover voltage is significantly higher than the rain voltage for the same conditions.The voltage variations with the insulate profiles are regular in a fixed range with the increased shed overhang leading to higher flashover voltages.Larger spaces between the sheds increase the pollution flashover voltage while the rain flashover voltage first increase and then decrease.Both types of flashover voltages decrease significantly with increasing mandrel diameter.Therefore,the pollution insulation deterioration can be evaluated based on only the pollution flashover at high altitudes and the flashover voltage can be increased more than 25% by optimizing the shed parameters.更多还原