Abstract：The drop of insulation performance of insulator under icing weather is one of the important causes of grid accident. Although domestic and foreign scientists have carried out many researches on icing insulators, the study on insulator string arrangement is relatively lacking. This paper presents the inverted T-type arrangement based on the practical problems in the construction and reconstruction of transmission lines. During the test, the insulators were polluted by solid layer method. Natural icing environment were simulated in the artificial climate chamber. Regarding single string and inverted T-type arrangement string with the same leakage distance, AC flashover test considering the variation of equivalent salt deposit density (ESDD) and icing degree were carried out. The tests and analysis indicate that insulators are not bridged by icicles in the horizontal section of the inverted T-type arrangement string, while the ice flashover voltage (Umf) between the ESDD and ice thickness of the inverted T-type insulator string satisfy negative power function, which is less affected by the ESSD and icing degree. There are also differences in arc starting position and development path in the flashover process under the two arrangements. Compared with single string, also the critical leakage current of the inverted T-type arrangement string has descent about 9.71% and the ice flashover voltage of it has improved about 6.21%~9.69%.
蒋兴良, 毕聪来, 王涵, 杨忠毅, 韩兴波. 倒T型布置对绝缘子串覆冰及其交流闪络特性的影响[J]. 电工技术学报, 2019, 34(17): 3713-3720.
Jiang Xingliang, Bi Conglai, Wang Han, Yang Zhongyi, Han Xingbo. Influence of T-Type Arrangement on Icing Process and AC Flashover Performance of Insulator Strings. Transactions of China Electrotechnical Society, 2019, 34(17): 3713-3720.
[1] 蒋兴良, 易辉. 输电线路覆冰及防护[M]. 北京:中国电力出版社, 2002. [2] 蒋兴良, 张志劲, 胡琴, 等. 再次面临电网冰雪灾害的反思与思考[J]. 高电压技术, 2018, 44(2): 463-469. Jiang Xingliang, Zhang Zhijin, Hu Qin, et al.Thinkings on the restrike of ice and snow disaster to the power grid[J]. High Voltage Engineering, 2018, 44(2): 463-469. [3] 蒋兴良, 舒立春, 孙才新. 电力系统污秽与覆冰绝缘[M]. 北京: 中国电力出版社, 2009. [4] 胡琴, 袁伟, 舒立春, 等. 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, et al.Influence of voltage types on composite insulator icing and flashover characteristics[J]. Transactions of China Electrotechnical Society, 2015, 30(3): 268-276. [5] Sugawara N, Hokari K, Matsuoka R, et al.Insulation properties of iced various insulators during freezing rain and de-icing[C]//Sixth International Symposium on High Voltage Engineering, New Orleans, LA, 1989: 33-47. [6] 刘正响, 黄长学, 马文广, 等. 防污增爬裙的研究与实践[J]. 高电压技术, 1997, 23(4): 56-58. Liu Zhengxiang, Huang Changxue, Ma Wenguang, et al.Research and practices of the composite antipollution shed[J]. High Voltage Engineering, 1997, 23(4): 56-58. [7] 胡建林. 低气压下覆冰绝缘子(长)串闪络特性及直流放电模型研究[D]. 重庆: 重庆大学, 2009. [8] Kannus K,Verkkonen V.Effect of ice coating on the dielectric strength of high-voltage insulators[C]//4th IWAIS, Paris, 1988. [9] Bui H T, Phan L C, Huraux C, et al.HVDC flashover on the surface of conductive ice[C]//IEEE International Conference on Electrical Insulation, Montreal, 2016: 85-88. [10] 郭裕钧, 蒋兴良, 孟志高, 等. 带并联间隙地线复合绝缘子直流覆冰闪络特性[J]. 电工技术学报, 2017, 32(14): 252-258. Guo Yujun, Jiang Xingliang, Meng Zhigao, et al.DC icing flashover performance of composite insulators with a parallel air gap used for overhead ground wire insulation[J]. Transactions of China Electrotechnical Society, 2017, 32(14): 252-258. [11] 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. [12] 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 performance[J]. Transactions of China Electrotechnical Society, 2014, 29(8): 319-326. [13] 范建斌, 黄志秋, 谢荣坤, 等. 直流输电线路Y型绝缘子串污闪特性研究[J]. 电网技术, 2007, 31(18): 28-32. Fan Jianbin, Huang Zhiqiu, Xie Rongkun, et al.Research on pollution flashover performance of Y-Type of insulator strings used in HVDC transmission line[J]. Power System Technology, 2007, 31(18): 28-32. [14] Liao Jintao, Peng Zongren, Wang Qingyu.Potential distribution analysis of Y-type insulators in UHV 1000kV double circuit transmission lines[C]//2005 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials, Sydney, NSW, Australia, 2015: 576-579. [15] Farzaneh M, Baker T.Insulator icing test methods and procedures: a position paper prepared by the IEEE task force on insulator icing test methods[J]. IEEE Transactions on Power Delivery, 2002, 18(4): 1503-1515. [16] IEC 1245. Artificial pollution tests on high-voltage insulators to be used on d.c. systemEC 1245. Artificial pollution tests on high-voltage insulators to be used on d.c. system[S]. Geneva, Switzerland, 1993. [17] Farzaneh M, Drapeau J F.AC flashover performance of insulators covered with artificial ice[J]. IEEE Transactions on Power Delivery, 1995, 10(2): 1038-1051. [18] Kawai M.AC flashover tests at project UHV on ice-coated insulators[J]. IEEE Transactions Power Apparatus and Systems, 1970, 89(8): 1800-1804. [19] Fujimura T, Naito K.Performance of insulators covered with snow or ice[J]. IEEE Transactions on Power Apparatus and Systems, 1979, 98(5): 1621-1631. [20] 蒋兴良, 赵世华, 张志劲, 等. 覆冰绝缘子串泄漏电流与覆冰量及覆冰水电导率的关系[J]. 电工技术学报, 2014, 29(10): 296-303. Jiang Xingliang, Zhao Shihua, Zhang Zhijin, et al.Relationship between leakage current of ice-covered insulators icing weight, and icing water conductivity[J]. Transactions of China Electrotechnical Society, 2014, 29(10): 296-303. [21] 关志成. 绝缘子及输变电设备外绝缘[M]. 北京: 清华大学出版社, 2006.
2019, Vol. 34 
