Abstract：Pollution flashover accidents of insulators may threaten the operation safety of power system, whereas, the research on pollution mechanism is based on plate model by now. The paper studies the DC pollution flashover process of insulator string at low air pressure by high speed vidicon. The results suggest that the arising and developing of partial arc, which maybe multi-partial arcs, is stochastic during the DC pollution flashover process of insulator string at low air pressure. Some of the partial arcs may deviate from the surface of polluted insulator string and form the air gap arcs during the pollution flashover process. The partial arcs include two main parts: air gap arcs and surface arcs during the flashover process for the polluted insulator string. The flashover distance of polluted insulator string is shorter than leakage distance under low air pressure. The DC initial arc voltage of polluted insulator string is lower about 15～35 percent than flashover voltage. It is more easily arising partial arc for polluted insulator string under lower air pressure and more height of altitude and shorter time of arc burning. The figure of partial arc is related to pollution and air pressure and so on.
张志劲, 蒋兴良, 孙才新, 胡建林, 苑吉河. 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, Hu Jianlin, Yuan Jihe. DC Pollution Flashover Process for Insulator String at Low Air Pressure. Transactions of China Electrotechnical Society, 2009, 24(4): 30-35.
[1] 顾乐观, 孙才新. 电力系统的污秽绝缘[M]. 1版. 重庆：重庆大学出版社, 1990. [2] 孙才新. 大气环境与电气外绝缘[M]. 1版. 北京：中国电力出版社, 2002. [3] 张志劲, 蒋兴良, 孙才新. 污秽绝缘子闪络特性研究现状[J]. 电网技术, 2006, 30(2): 35-40. [4] 张建辉. 绝缘子污秽闪络机理及影响因素的研 究[D]. 重庆: 重庆大学, 1991. [5] Zhang Renyu, Zheng J. Progress in outdoor insulation research in china[J]. IEEE Transaction on Dielectrics and Electrical Insulation, 1990, 25(6): 1125-1137. [6] Wilkins R, Hura C. Arc propagation along an electrolyte surface[J]. IEE Proceedings-Generation Transmission and Distribution, 1972, 118(12): 1886-1892. [7] 黄超峰. 高海拔地区染污绝缘子放电特性的研 究[D]. 北京：清华大学, 1993. [8] Kawamura T. Pressure dependence of DC breakdown of contaminated insulators[J]. IEEE Transaction on Dielectrics and Electrical Insulation, 1982, 17(1): 39-45. [9] 周军. 高海拔区染污绝缘放电特性的研究[D]. 北京：清华大学, 2004. [10] IEC-1245. Artificial pollution tests on high-voltage insulators to be used on d.c. system[S]. 1993. [11] 孙才新, 蒋兴良, 司马文霞. 海拔4000m 以上短间隙交流放电特性及电压校正[J]．中国电机工程学报, 2002, 22(10): 116-120. [12] 蒋兴良, 谢述教, 舒立春. 低气压下三种直流绝缘子覆冰闪络特性及其比较[J]. 中国电机工程学报, 2004, 24(9): 158-162. [13] 赵铁滨. 高海拔地区染污绝缘子交流放电特性研 究[D]. 北京: 清华大学, 1986. [14] David C Jolly. Contamination flashover part I: theoretical aspects[J]. IEEE Transaction on Power Apparatus System, 1972, 91(3)：2437-2442. [15] Sundararajan R, Gorur R S. Dynamic arc modeling of pollution flashover if insulators under dc voltage[J]. IEEE Transaction on Electrical Insulation, 1993, 26(2): 209-218. [16] 张仁豫, 关志成, 黄超峰. 低气压对玻璃板表面污闪电压的影响[J]. 电网技术, 1994, 18(3): 17-21. [17] Rizk F A M. Modeling of altitude effects on AC flashover of polluted high voltage insulators[J]. IEEE Transaction on Power Delivery, 1997, 12(2): 810-822. [18] 李立浧, 蒋兴良, 孙才新, 等. ±800kV直流复合绝缘子短样人工污秽闪络特性研究[J]. 中国电机工程学报, 2007, 27(10): 14-19． Li Licheng, Jiang Xingliang, Sun Caixin, et al. Study on pollution flashover performance of short sample of ±800kV UHV DC composite insulators[J]. Procee- dings of the CSEE, 2007, 27(10): 14-19． [19] 贺博, 林辉, 符强. 交流污闪电弧动态特征探究[J]. 中国电机工程学报, 2006, 26(21)：177-182. [20] 张志劲. 低气压下绝缘子(长)串污闪特性及直流放电模型研究[D]. 重庆：重庆大学, 2007． [21] 蒋兴良, 张志劲, 胡建林．高海拔下不同伞形结构750 kV合成绝缘子短样交流污秽闪络特性及其比较[J]. 中国电机工程学报, 2005, 25(12): 159-164． Jiang Xingliang, Zhang Zhijin, Hu Jianlin. AC pollution flashover performance and comparison of short samples of 750 kV composite insulators with different configuration in high altitude area [J]. Proceedings of the CSEE, 2005, 25(12): 159-164. [22] 蒋兴良, 苑吉河, 孙才新, 等．我国±800kV特高压直流输电线路外绝缘问题[J]. 电网技术, 2006, 30(9): 1-9. [23] Farzaneh M, Zhang J, Li Y. Effects of low air pressure on AC and DC arc propagation on ice surface[J]. IEEE Transaction on Dielectrics and Electrical Insulation, 2005, 12(1): 60-71. [24] 胡建林, 蒋兴良, 张志劲, 等．布置方式对直流绝缘子串人工污秽闪络特性的影响[J]．电网技术, 2006, 30(23): 11-14． Hu Jianlin, Jiang Xingliang, Zhang Zhijin, et al. Influence of suspension mode on artificial pollution flashover performance of DC insulator strings[J]. Power System Technology, 2006, 30(23): 11-14.
2009, Vol. 24 
