Influence of Conductivity Defects of Composite Insulators on Live-Line Working Approach Distance

doi:10.11930/j.issn.1004-9649.201811005

Abstract

Abstract: The composite insulators are likely to have such defects as aging, damage and mandrel carbonization after a long-term operation, which could cause safety problem for its' live-line maintenance. In this paper, taking the I-series composite insulators of a 500 kV transmission line as an example, the discharge characteristics of the composite insulators under different conductivity defects are obtained through impulse discharge tests, and the location and size limitation requirements of the conductivity defects are determined through the insulation coordination method of live-line working. The testing results show that when the conductivity defect exists at the high-voltage end, the impulse discharge voltage of the gap is lower, which has a greater impact on the safety of live-line working; In order to ensure the safety of live-line working, when the conductivity defect exists at the high-voltage end of composite insulator, the maximum allowable length of conductivity defect is 0.7 m; when the conductivity defect exists in the middle of composite insulator, the discharge voltage is the lowest when defect exists at the position about 1/4 of the length of the insulator away from the high-voltage end, and the maximum allowable length of conductivity defect is 0.9 m. The location and size limitation requirements of the conductivity defects of composite insulators determined in this paper can provide a technical support for the safety of live-line overhaul working of composite insulators on transmission lines and guide the safety detection of composite insulators before live-line working.

Key words: composite insulator, conductivity defect, live-line working, operation impulse discharge, approach distance

CLC Number:

TM84

LEI Xinglie, LI Yuze, PENG Yong, FANG Yuqun, QIAN Liqun. Influence of Conductivity Defects of Composite Insulators on Live-Line Working Approach Distance[J]. Electric Power, 2019, 52(6): 134-139.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201811005

https://www.electricpower.com.cn/EN/Y2019/V52/I6/134

References

[1] 陈原, 吴光亚, 叶廷路, 等. 发展工厂复合化绝缘子提高特高压电网配置质量[J]. 中国电力, 2017, 50(8):1-15, 157 CHEN Yuan, WU Guangya, YE Tinglu, et al. Development of factory-composited insulators for improving UHV grid configuration quality[J]. Electric Power, 2017, 50(8):1-15, 157
[2] 崔江流, 宿志一. 我国硅橡胶合成绝缘子的应用与展望[J]. 中国电力, 1999, 32(1):38-41 CUI Jiangliu, SU Zhiyi. The application and its prospect of silicon rubber composite insulators in China[J]. Electric Power, 1999, 32(1):38-41
[3] LIANG X D, LI S H. Looking to the future of composite insulators[C]//2015 World Congress on Insulators, Arresters & Bushings. Munich, Germany, 2015:18-21.
[4] LIANG X D, WANG J F. Review of 30 years development of silicone rubber insulators:the Chinese experience[C]//2013 World Congress on Insulators, Arresters & Bushings. Vancouver, Canada, 2013:9-11.
[5] 阎东, 卢明, 张柯, 等. 输电线路用复合绝缘子运行技术及实例分析[M]. 北京:中国电力出版社, 2008.
[6] 郑秋玮, 刘华钢, 邹建明, 等. ±500 kV兴安直流线路复合绝缘子积污特性[J]. 中国电力, 2015, 48(8):86-91 ZHENG Qiuwei, LIU Huagang, ZOU Jianming, et al. Contamination accumulating features of composite insulator of ±500 kV Xingren-Baoan HVDC transmission line[J]. Electric Power, 2015, 48(8):86-91
[7] 胡毅, 刘凯, 彭勇, 等. 带电作业关键技术研究进展与趋[J]. 高电压技术, 2014, 40(7):1921-1931 HU Yi, LIU Kai, PENG Yong, et al. Research status and development trend of live working key technology[J]. High Voltage Engineering, 2014, 40(7):1921-1931
[8] 刘艳敏, 王建军, 吴季浩, 等. 输配电线路带电作业仿真培训系统研发[J]. 电气应用, 2013, 32(S2):430-434 LIU Yanmin, WANG Jianjun, WU Jihao, et al. Development of simulation training system for live line operation of transmission and distribution lines[J]. Electrotechnical Application, 2013, 32(S2):430-434
[9] ILHAN S. A flashover performance of 380 kV V-strings with composite insulators under lightning and switching impulses[C]//IEEE Bucharest Power Tech Conference, Bucharest, Romania, 2009.
[10] CARREIRA A. Live-line maintenance with non-ceramic insulators[C]//IEEE PES ESMO 2006 Conference, Albuquerque, New Mexico, USA, October 18, 2006.
[11] CARREIRA A J. Live-line working of non-ceramic insulators[C]//11th International Conference on Live Maintenance, Budapest, Hungary, 2014.
[12] CARREIRA A J. Guidelines for establishing diagnostic procedures for live-line working of non-ceramic insulators[C]//IEEE Lightning & Insulator Subcommittee, Task Force, 2014.
[13] 王少华, 叶自强, 罗盛. 500 kV复合绝缘子断裂机理及检测方法[J]. 中国电力, 2011, 44(8):19-21 WANG Shaohua, YE Ziqiang, LUO Sheng. Fracture mechanism and defect detection methods of 500 kV composite insulators[J]. Electric Power, 2011, 44(8):19-21
[14] 党会学, 赵均海, 吴静. V形复合绝缘子力学特性研究[J]. 中国电力, 2016, 49(7):9-14 DANG Huixue, ZHAO Junhai, WU Jing. Characteristic study for wind age yaw analysis of V-shape composite insulator string[J]. Electric Power, 2016, 49(7):9-14
[15] 李鹏, 马斌, 刘道辉, 等. 紫外线老化对复合绝缘子硅橡胶憎水性的影响[J]. 中国电力, 2015, 48(3):80-83 LI Peng, MA Bin, LIU Daohui, et al. Influence of ultraviolet radiation aging on hydrophobicity of silicone rubber used for composite insulator[J]. Electric Power, 2015, 48(3):80-83
[16] 刘洋. 交流复合绝缘子老化性能试验研究[D]. 武汉:武汉大学, 2009.
[17] 刘晓伟, 张雪峰, 刘春翔, 等. 棒形悬式复合绝缘子内部缺陷对电场分布的影响[J]. 电瓷避雷器, 2014(2):16-20 LIU Xiaowei, ZHANG Xuefeng, LIU Chunxiang, et al. Effect of internal defects on the electric field distribution of rod suspension composite insulators[J]. Insulators and Surge Arresters, 2014(2):16-20
[18] 高电压试验技术第一部分:一般试验要求:GB/T 16927. 1—1997[S]. 1997.
[19] Insulation coordination (part2):IEC 60071-2-0996[S]. 1996.
[20] KUBUKI M, YOSHIMOTO R, YOSHIZUMI K, et al. Estimation of DC break-down mechanisms in air gaps containing floating metallic particles[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 1997, 4(1):92-101.
[21] FAROUK A, RIZK M. Effect of floating conducting objects on critical switching impulse breakdown of air insulation[J]. IEEE Transactions on Power Delivery, 1995, 10(3):1360-1370.