CAJ | 학술논문

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.
게시지표태양자외복사대전력계통외절연방전특성적영향대우강자외복사지구외절연설계화운행유착중요적의의.이용인공자외광원모의대기배경중적자외복사,재실험실연구료자외복사대공기간극공빈방전특성적영향.시험결과표명지표태양자외복사대공기간극공빈격천전압화전훈방전균무명현영향.산생저충현상적원인시:지표태양자외복사적광자능량소우철화동급기양화물적일출공,인차무법종철、동전겁중전리출전자.동시,자외복사대공기간극방전발전과정야몰유명현영향.수연저일파단적부분광자능량고우려적일출공,단유우려재공기중겁역양화,형성양화막(Al2O3),저층양화막조지료자외광자종려전겁표면전리출전자.인차,태양자외복사대폭로재공기중적동、철、려전겁적공빈방전균무명현영향.
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 Al, Al is easy to be oxidized in the air and then its oxide film Al2O3 is formed in the air, and this Al2O3 layer prevents the electrons to be ionized out from the surface of Al electrode. Thus, there is not evident influence of TSUVR on power frequency discharge of electrodes of copper, iron and Al, which exposed in the air.