The weather system, meteorological conditions, and microphysics of cloud, fog, and rain droplets are studied during the formation, growth, maintenance, and shedding periods of ice accretion on wires in Enshi, Hubei Pr...The weather system, meteorological conditions, and microphysics of cloud, fog, and rain droplets are studied during the formation, growth, maintenance, and shedding periods of ice accretion on wires in Enshi, Hubei Province in China using 2008/2009 and 2009/2010 winter observations. The comprehensive observations include data of visibility, microphysics of fog and rain droplets, and ice thickness, as well as data from an automated weather station and other routinely recorded meteorological data. The results show that icing occurred during the passage of a cold front, with a high-pressure system and a cold temperature trough at 850 hPa, and a southeasterly at 500 hPa that provided abundant moisture. Ice formation usually started in the evening or early morning, and ice shed around noon the following day when the temperature was -1℃ to 0℃. The averaged liquid water content of the fog droplet was distinctly greater during the growth period than during the other three periods, and there was precipitation during the growth period in each case of ice accretion. The growth rate of the ice thickness was clearly correlated with the liquid water content, with a correlation coefficient of 0.62. Simulations using empirical equations were carried out, and the simulated ice thickness agreed with observations fairly well.展开更多
复合绝缘子伞形结构对其周围流场特性有明显的影响,从而导致其覆冰特性存在差异。为此,分别在人工气候室和自然覆冰试验站对多种伞形结构220 k V复合绝缘子进行了人工模拟和自然现场覆冰试验研究,分析了伞形结构对其覆冰增长特性的影响...复合绝缘子伞形结构对其周围流场特性有明显的影响,从而导致其覆冰特性存在差异。为此,分别在人工气候室和自然覆冰试验站对多种伞形结构220 k V复合绝缘子进行了人工模拟和自然现场覆冰试验研究,分析了伞形结构对其覆冰增长特性的影响规律,结果表明:随着覆冰程度的增大,冰棱根数逐渐减少,冰棱长度和直径、伞面冰厚和覆冰重量均逐渐增大但增速变慢;伞裙直径增大时,覆冰增长较快,而伞间距增大时,冰棱长度、伞面冰厚和覆冰重量均逐渐变大但冰棱直径变小;在重度覆冰条件下,伞形结构的影响已不明显;自然覆冰条件下,伞形结构对绝缘子覆冰增长的影响规律与人工模拟试验结果基本一致。展开更多
基金supported by National Key Technology R&D Program of China (Grant No. 2008BAC48B01)National Natural Science Foundation of China (Grant No. 40775012)+1 种基金the Jiangsu Province Qinglan Project for Cloud Fog Precipitation and the Aerosol Research Groupa project funded by the Priority Acadenic Program Development of Jiangsu Higher Education Institutions
文摘The weather system, meteorological conditions, and microphysics of cloud, fog, and rain droplets are studied during the formation, growth, maintenance, and shedding periods of ice accretion on wires in Enshi, Hubei Province in China using 2008/2009 and 2009/2010 winter observations. The comprehensive observations include data of visibility, microphysics of fog and rain droplets, and ice thickness, as well as data from an automated weather station and other routinely recorded meteorological data. The results show that icing occurred during the passage of a cold front, with a high-pressure system and a cold temperature trough at 850 hPa, and a southeasterly at 500 hPa that provided abundant moisture. Ice formation usually started in the evening or early morning, and ice shed around noon the following day when the temperature was -1℃ to 0℃. The averaged liquid water content of the fog droplet was distinctly greater during the growth period than during the other three periods, and there was precipitation during the growth period in each case of ice accretion. The growth rate of the ice thickness was clearly correlated with the liquid water content, with a correlation coefficient of 0.62. Simulations using empirical equations were carried out, and the simulated ice thickness agreed with observations fairly well.
文摘复合绝缘子伞形结构对其周围流场特性有明显的影响,从而导致其覆冰特性存在差异。为此,分别在人工气候室和自然覆冰试验站对多种伞形结构220 k V复合绝缘子进行了人工模拟和自然现场覆冰试验研究,分析了伞形结构对其覆冰增长特性的影响规律,结果表明:随着覆冰程度的增大,冰棱根数逐渐减少,冰棱长度和直径、伞面冰厚和覆冰重量均逐渐增大但增速变慢;伞裙直径增大时,覆冰增长较快,而伞间距增大时,冰棱长度、伞面冰厚和覆冰重量均逐渐变大但冰棱直径变小;在重度覆冰条件下,伞形结构的影响已不明显;自然覆冰条件下,伞形结构对绝缘子覆冰增长的影响规律与人工模拟试验结果基本一致。
