Corona discharge is being detected by UV imaging detection technology at home and abroad in recent years.This technology is used in the corona tests of conductor bundles in this paper.In order to further research the ...Corona discharge is being detected by UV imaging detection technology at home and abroad in recent years.This technology is used in the corona tests of conductor bundles in this paper.In order to further research the corona characteristic,optimize geometry parameters and diameter of sub-conductor,and increase corona onset voltage of transmission lines,corona tests of three model conductors which are placed inside the outdoor corona cage are conducted.Corona cage could be used to simulate the corona activities on transmission lines under a low voltage and different conditions in an effective and economical way.Photon which was created by UV light as a result of corona discharge on conductors is detected by the UV detection apparatus.The photon number within unit interval,namely photon counting rate is adopted as the parameter of quantifying the intensity of corona discharge.According to the apparent change of photon number,corona onset voltage can be judged.All tests are conducted under almost same atmosphere condition.Using the method,corona onset voltage is acquired.The results indicate that the tests have a good repeatability,in other words,repeating same test twice same result can be aquired.The corona onset voltage can be acquired exactly from the curve of applied voltage vs.photon counting rate.Therefore UV detection apparatus can not only used to find discharge point exactly,but also applied on corona discharge research and live detection for power equipments.The method using in this paper is proved that is a new available method.展开更多
以红心萝卜为实验材料,研究了不同剂量的短波紫外线(ultraviolet-C,UV-C)处理对鲜切红心萝卜的抗氧化系统和抗氧化活性的影响。鲜切红心萝卜用0、0.25、0.5、1.0、2.0 k J/m2剂量的UV-C处理后于5℃贮藏48 h。结果表明,1.0 k J/m2 UV-C...以红心萝卜为实验材料,研究了不同剂量的短波紫外线(ultraviolet-C,UV-C)处理对鲜切红心萝卜的抗氧化系统和抗氧化活性的影响。鲜切红心萝卜用0、0.25、0.5、1.0、2.0 k J/m2剂量的UV-C处理后于5℃贮藏48 h。结果表明,1.0 k J/m2 UV-C处理能最有效地诱导鲜切红心萝卜中酚类物质的合成,进而导致其含量增加,并提高了红心萝卜中的1,1-二苯基-2-三硝基苯肼自由基清除能力。UV-C处理能促进鲜切红心萝卜中花青素和黄酮类物质含量的增加、延缓抗坏血酸含量的下降、并提高抗氧化酶活性。这些结果表明,UV-C处理可以诱导酚类物质合成,提高抗氧化酶活性,从而显著提升鲜切红心萝卜的抗氧化活性。展开更多
基金Project Supported by UHV Transmission and Transformation System Development and Demonstration Program of National Key Tech-nology R&D Program(2006BAA02A04)
文摘Corona discharge is being detected by UV imaging detection technology at home and abroad in recent years.This technology is used in the corona tests of conductor bundles in this paper.In order to further research the corona characteristic,optimize geometry parameters and diameter of sub-conductor,and increase corona onset voltage of transmission lines,corona tests of three model conductors which are placed inside the outdoor corona cage are conducted.Corona cage could be used to simulate the corona activities on transmission lines under a low voltage and different conditions in an effective and economical way.Photon which was created by UV light as a result of corona discharge on conductors is detected by the UV detection apparatus.The photon number within unit interval,namely photon counting rate is adopted as the parameter of quantifying the intensity of corona discharge.According to the apparent change of photon number,corona onset voltage can be judged.All tests are conducted under almost same atmosphere condition.Using the method,corona onset voltage is acquired.The results indicate that the tests have a good repeatability,in other words,repeating same test twice same result can be aquired.The corona onset voltage can be acquired exactly from the curve of applied voltage vs.photon counting rate.Therefore UV detection apparatus can not only used to find discharge point exactly,but also applied on corona discharge research and live detection for power equipments.The method using in this paper is proved that is a new available method.
文摘以红心萝卜为实验材料,研究了不同剂量的短波紫外线(ultraviolet-C,UV-C)处理对鲜切红心萝卜的抗氧化系统和抗氧化活性的影响。鲜切红心萝卜用0、0.25、0.5、1.0、2.0 k J/m2剂量的UV-C处理后于5℃贮藏48 h。结果表明,1.0 k J/m2 UV-C处理能最有效地诱导鲜切红心萝卜中酚类物质的合成,进而导致其含量增加,并提高了红心萝卜中的1,1-二苯基-2-三硝基苯肼自由基清除能力。UV-C处理能促进鲜切红心萝卜中花青素和黄酮类物质含量的增加、延缓抗坏血酸含量的下降、并提高抗氧化酶活性。这些结果表明,UV-C处理可以诱导酚类物质合成,提高抗氧化酶活性,从而显著提升鲜切红心萝卜的抗氧化活性。
