地表紫外辐射对棒-板空气间隙工频放电的影响  

Effect of Terrestrial Solar UV Radiation on Power Frequency Discharge Performance of Rod-Plane Air Gap

作　　者：杨占刚[1] 舒立春[1] 蒋兴良[1] 胡琴[1] 邱宗奎[2] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044 [2]四川电力设计咨询有限责任公司,四川省成都市610016

出　　处：《电网技术》2013年第6期1607-1613,共7页Power System Technology

基　　金：国家重点基础研究发展计划项目(97 3项目)(2009CB724502;2009CB724501);国家自然科学基金项目(51007099;51021005)~~

摘　　要：揭示地表太阳紫外辐射对电力系统外绝缘放电特性的影响对于强紫外辐射地区外绝缘设计和运行有着重要的意义。利用人工紫外光源模拟大气环境中的紫外辐射,在实验室研究了紫外辐射对空气间隙工频放电特性的影响。试验结果表明地表太阳紫外辐射对空气间隙工频击穿电压和电晕放电均无明显影响。产生这种现象的原因是:地表太阳紫外辐射的光子能量小于铁和铜及其氧化物的逸出功,因此无法从铁、铜电极中电离出电子。同时,紫外辐射对空气间隙放电发展过程也没有明显影响。虽然这一波段的部分光子能量高于铝的逸出功,但由于铝在空气中极易氧化,形成氧化膜(Al2O3),这层氧化膜阻止了紫外光子从铝电极表面电离出电子。因此,太阳紫外辐射对暴露在空气中的铜、铁、铝电极的工频放电均无明显影响。It is significant to reveal the effect of terrestrial solar ultraviolet radiation （TSUVR） on discharge performance of power system external insulation for the design and operation of external insulation in the regions with strong TSUVR. The ultraviolet radiation （UVR） in atmospheric environment is simulated by artificial ultraviolet light source, and the effect of UVR on power frequency discharge characteristic of air-gap is researched in laboratory. The experimental results show that the TSUVR does not effect on both power frequency breakdown voltage of air-gap and corona discharge evidently. The experimental results are explained as following： the photon energy of TSUVR is smaller than the work function of iron, copper and their oxides, therefore it is impossible to photo-ionize out electrons from iron or copper electrodes and there is not evident influence on the discharge process. Although partial photon energy is higher than the work function of AI, A1 is easy to be oxidized in the air and then its oxide film A1203 is formed in the air, and this A1203 layer prevents the electrons to be ionized out from the surface of A1 electrode. Thus, there is not evident influence of TSUVR on power frequency discharge of electrodes of copper, iron and A1, which exposed in the air.

关 键 词：紫外辐射 空气间隙 工频 击穿电压 电晕 

分 类 号：TM85[电气工程—高电压与绝缘技术]