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. Take seven units of XP-160 for example, the paper studies the DC pollution flashover model of polluted insulator string. The electrical circuit model explaining the DC flashover process of polluted insulator string is put forward in this paper, which consists of a surface arc, air gap arc and residual resistance of the pollution layer. The relative error of critical pollution flashover voltage obtained by the model and the experimental result is in seven percent. It also shows that the thermal buoyant force may take dominant action when the leakage current is larger than 200 milliampere during the flashover process for the polluted insulator string and thus explains the reason that the partial arc may derive from the surface of insulator.
张志劲, 蒋兴良, 孙才新, 胡建林, 苑吉河. 染污绝缘子串直流污闪放电模型及验证[J]. 电工技术学报, 2009, 24(4): 36-41.
Zhang Zhijin, Jiang Xingliang, Sun Caixin, Hu Jianlin, Yuan Jihe. DC Pollution Flashover Model and Its Validation of Polluted Insulator Strings. Transactions of China Electrotechnical Society, 2009, 24(4): 36-41.
[1] 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. [2] 顾乐观, 孙才新. 电力系统的污秽绝缘[M]. 重庆: 重庆大学出版社, 1990. [3] 孙才新. 大气环境与电气外绝缘[M]. 北京: 中国电力出版社, 2002. [4] Rizk F A M. Mathematical models for polluted flashover [J]. Electra, 1981(78): 71-103. [5] Alston L L, Zoledziowski S. Growth of discharges on polluted insulation[J]. IEE Proceedings-Generation Transmission and Distribution, 1963, 110(7): 1260- 1266. [6] Boehme H, Obenaus F. Pollution flashover tests on insulators in the laboratory and in the systems and the model concept of creepage-path flashover[C]. Confe- rence of International Council on Large Electric Syst- ems, Paris, 1966: 407. [7] Farag A S, Shwehdi M H. Interfacial breakdown on contaminated electrolytic surface[C]. Conference on Electrical Insulation and Electrical Manufacturing & Coil Winding, USA, 1997: 789-794. [8] Hampton B F. Flashover mechanism of polluted insulation [J]. IEE Proceedings-Generation Transm- ission and Distribution, 1964, 111(5): 985-990. [9] Wilkins R. Flashover of high voltage onsulators with uniform surface pollution films[J]. IEE Proceedings- Generation Transmission and Distribution, 1969, 116(3): 457-465. [10] 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. [11] CIGRE WG’S-33.04. A critical comparison of artificial pollution test methods for HV insulators [J]. Electra, 1979(64): 117-136. [12] CIGRE WG’S-33.04. Artificial pollution testing of HVDC insulators: analysis of factors influencing performance [J]. Electra, 1992(140): 99-113. [13] IEC 1245. Artificial pollution tests on high-voltage insulators to be used on d.c. system[S]. 1993. [14] 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. [15] 张仁豫. 绝缘污秽放电[M]. 北京: 水利电力出版社, 1994. [16] 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. [17] 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. [18] 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. [19] Jolly David C. Contamination flashover part I: theoretical aspects[J]. IEEE Transaction on Power and Apparatus Systems, 1972, PAS-91: 2437-2442. [20] 关志成. 在交、直流电压下染污绝缘子闪络条件的分析计算和试验研究[D]. 北京: 清华大学, 1984.
2009, Vol. 24 
