Abstract：The drop of insulation performance of insulator under icing or snow weather is one of the important causes of grid accident. Although domestic and foreign scientists had carried out many researches on icing insulators, the study on snow-covered insulators is relatively lacking. The influence of snow-covered insulators on transmission line insulation safety cannot be ignored. Therefore, it is necessary to study the performance of snow-covered insulators. Generally, there are even snow accretion and uneven snow accretion on insulators. This paper simulates natural snowing environment in the artificial climate chamber. Regarding polluted suspension glass and ceramic insulators, the influences of even and uneven snow accretions on their negative DC flashover characteristics and flashover process are compared. It is shown that the influence of uneven snow accretion on DC flashover characters is greater than that of even snow accretion when the degrees of snow accretion are the same, while in the case of heavier pollution on insulators, the influence of snow accretion shape on insulators deceases, particularly, under severe pollution, the snow accretion shape has no impacts on insulator flashover voltage. The snow flashover process is similar to pollution flashover at the initial stage while similar to ice flashover in the end. With uneven snow accretion, the flashover path develops along the leeward side of insulators.
蒋兴良, 郭思华, 胡建林, 胡玉耀, 杨洪椿. 不同覆雪形态对悬式绝缘子直流负极性闪络特性的影响[J]. 电工技术学报, 2018, 33(2): 451-458.
Jiang Xingliang, Guo Sihua, Hu Jianlin, Hu Yuyao, Yang Hongchun. Influence of Snow Accretion with Different Shape on Negative DC Flashover Characteristics of Suspension Insulators. Transactions of China Electrotechnical Society, 2018, 33(2): 451-458.
[1] Farzaneh M. 覆冰与污秽绝缘子[M]. 蒋兴良, 译. 北京: 机械工业出版社, 2014. [2] Farzaneh M, Kiernicki J. Flashover problems caused by ice build up on insulators[J]. IEEE Electrical Insulation Magazine, 1995, 11(2): 5-17. [3] Berlijn S, Halsan K, Gutman I. Summarizing knowledge from laboratory ice and snow tests on glass and composite insulators for overhead lines[C]// The 15th International Workshop on Atmospheric Icing of Structures (IWAIS), St Johns, 2013. [4] Homma H, Yaji K, Aso T, et al. Evaluation of flashover voltage property of snow accreted insulators for overhead transmission lines, part III 154kV full-scale flashover voltage test of snow accreted insulators[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2014, 21(16): 2568-2575. [5] Yaji K, Homma H, Sakata G, et al. Evaluation on flashover voltage property of snow accreted insulators for overhead transmission lines, part I: field observations and laboratory tests to evaluate snow accretion properties[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2014, 21(6): 2549-2558. [6] Yaji K, Homma H, Aso T, et al. Evaluation on flashover voltage property of snow accreted insulators for overhead transmission lines, part II: flashover characteristics under salt contaminated snowstorm[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2014, 21(6): 2559-2567. [7] 殷琼, 陈原. 高导电性降水降雪型快速积污导致的输变电设备污闪机理与放置措施[J]. 电网技术, 2008, 32(4): 1-6. Yin Qiong, Chen Yuan. Mechanism of pollution- flashover in power transmission and transformation equipments caused by rainfall or snowfall type high conductivity rapid contamination accumulation and its prevention measures[J]. Power System Technology, 2008, 32(4): 1-6. [8] 胡琴, 袁伟, 舒立春. 电压类型对复合绝缘子覆冰及闪络特性的影响[J]. 电工技术学报, 2015, 30(3): 268-276. Hu Qin, Yuan Wei, Shu Lichun. Influence of voltage types on composite insulator icing and flashover characteristics[J]. Transactions of China Electro- technical Society, 2015, 30(3): 268-276. [9] Sugawara N, Hokari K, Hijikata M, et al. Leakage resistance data acquisition system and several data for maintenance of transmission line porcelain insulators along coasts in wet snow[C]//The 5th International Conference on Properties and Appli- cations of Dielectr. Materials (ICPADM), Seoul, South Korea, 1997: 794-797. [10] Sugawara N, Hosono K. Insulation properties of long rod and line post insulators for 33kV transmission line in wet snow storm on January 2004[C]//The 11th International Workshop on Atmospheric Icing of Structures, Montreal, Quebec, Canada, 2005: 197-202. [11] Takahashi A, Fujita S, Sakata G. Electrical conductivity and chemical composition of snow collected in Niigata Prefecture, Japan[C]//The 13th International Workshop on Atmospheric Icing of Structures (IWAIS), 2009: IV-165-168. [12] Homma H, Yaji K, Aso T, et al. Snow accretion properties of various insulators exposed to an artificial wet snow accretion test[C]//The 13th International Workshop on Atmospheric Icing of Structures (IWAIS), 2009. [13] 向泽, 蒋兴良, 张志劲, 等. 玻璃绝缘子串自然覆冰(雪)交流闪络特性[J]. 高电压技术, 2014, 40(5): 1345-1350. Xiang Ze, Jiang Xingliang, Zhang Zhijin, et al. AC flashover performance of glass insulators covered with ice or snow at natural station[J]. High Voltage Engineering, 2014, 40(5): 1345-1350. [14] Wieck H, Gutman I, Ohnstad T. Investigation of flashover performance of snow-covered breakers[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2007, 14(6): 1339-1346. [15] Homma H, Yaji K, Aso T, et al. Evaluation of flashover voltage of snow accreted insulators for 154kV transmission lines[C]//The 15th International Workshop on Atmospheric Icing of Structures (IWAIS), 2013. [16] Sakamoto Y. Snow accretion on overhead wires[J]. Philosophical Transactions of the Royal Society, 2000, 358(1776): 2941-2970. [17] 孙才新, 司马文霞, 舒立春. 大气环境与电气外绝缘[M]. 北京: 中国电力出版社, 2009. [18] 张志劲, 蒋兴良, 孙才新. 低气压下绝缘子串直流污闪放电过程[J]. 电工技术学报, 2009, 24(4): 30-35. Zhang Zhijin, Jiang Xingliang, Sun Caixin. DC pollution flashover process for insulator string at low air pressure[J]. Transactions of China Electro- technical Society, 2009, 24(4): 30-35. [19] 叶民权. 积雪保温保墒作用分析[J]. 新疆农业科学, 1963, 7: 276, 293. Ye Minquan. Analysis of snow’s effects to heat and soil moisture preservation[J]. Xinjiang Agricultural Science, 1963, 7: 276, 293. [20] 谢述教. 直流绝缘子长串覆冰闪络特性研究[D]. 重庆: 重庆大学, 2004. [21] 刘毓, 蒋兴良, 舒立春, 等. 复合绝缘子伞裙结构特征参数对其冰闪特性的影响[J]. 电工技术学报, 2014, 29(8): 319-326. Liu Yu, Jiang Xingliang, Shu Lichun, et al. Influence of characterizing shed configuration parameters of composite insulators on icing flashover perfor- mance[J]. Transactions of China Electrotechnical Society, 2014, 29(8): 319-326. [22] Jiang Xingliang, Hu Yuyao, Shu Lichun, et al. Crystallisation effect of conductive ions in freezing water during phase transition and its effect on ice flashover voltage[J]. IET Generation, Transmission & Distribution, 2016, 10(9): 2147-2154.
2018, Vol. 33 
