地表紫外辐射对棒-板间隙正极性直流放电的影响

发布时间：2018-02-20 03:16

本文关键词： 紫外辐射棒板间隙空气放电正极性直流击穿电压电晕放电　出处：《高电压技术》2014年01期 　论文类型：期刊论文

【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,但是目前并没有相关的系统研究。为此,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棒板间隙正极性直流放电特性的影响。试验结果表明地表太阳紫外辐射对棒板间隙正极性直流击穿电压和电晕放电均无明显影响。分析认为,这是由于到达地表的太阳紫外辐射的波长范围为290～400 nm,且辐射照度≤200 W/m2,无法电离空气和铜、铁电极,对电弧的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、铝电极的正极性直流放电均无明显影响。所做工作填补了相关领域的空白,可为强紫外辐射地区的外绝缘设计提供技术支持。
[Abstract]:It is very important to reveal the influence of surface solar ultraviolet radiation on the discharge characteristics of external insulation in power system. However, there is no systematic research on the design and operation of external insulation in the area of strong ultraviolet radiation. Using artificial ultraviolet light sources to simulate ultraviolet radiation in the atmosphere, The effects of ultraviolet radiation on the positive DC discharge characteristics of rod gap were studied in laboratory. The experimental results show that the surface solar ultraviolet radiation has no obvious influence on the positive DC breakdown voltage and corona discharge of rod gap. This is due to the fact that the ultraviolet radiation of the sun reaches the surface in a wavelength range of 290 nm and 400 nm, and the irradiance is less than 200 W / m2, which cannot ionize the air and copper and iron electrodes. Although part of the photon energy in this band is higher than the escaping work of aluminum, aluminum is easily oxidized in air. An oxide film called Al _ 2O _ 3, which prevents ultraviolet photons from ionizing electrons from the surface of an aluminum electrode. Therefore, the sun's ultraviolet radiation is applied to copper, iron, and iron exposed to air. The positive direct current discharge of aluminum electrode has no obvious influence. The work done fills up the blank in the related field and can provide technical support for the external insulation design in the area of strong ultraviolet radiation.
【作者单位】：重庆大学输配电及系统安全与新技术国家重点实验室;四川电力设计咨询有限责任公司;
【基金】：国家重点基础研究发展计划(973计划)(2009CB724502;2009CB724501) 国家自然科学基金(51007099;51021005)~~
【分类号】：TM852

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