Study on Leakage Current Characteristics of Conductor-Plane Short Air Gap under Vegetation Fire Condition
Huang Daochun1, Lu Wei1, Yao Tao2, Xia Jun1, Quan Wanlin1
1. School of Electrical Engineering and Automation Wuhan University Wuhan 430072 China; 2. State Key Laboratory of Power Grid Environmental Protection China Electric Power Research Institute Wuhan 430074 China
Abstract：In order to study the leakage current characteristics of air gaps and its effect on gap discharge characteristics under flame condition, the discharge experiments of 45cm conductor-plane gap under different vegetation flames were carried out. The process of charge generation in vegetation flames was analyzed, the leakage current characteristics and the discharge voltages of the gap were discussed at the same time. The leakage current characteristics of the gap under vegetation flame with different combustion intensities were compared. The results show that under 12kV positive DC voltage, the leakage current peak value of the gap under fir branch flame is 27mA, and the straw flame is only 8.3mA; the breakdown voltage of the gap under the fir branch flame is about 44% of that under the straw flame condition. There is an obvious polarity effect of the leakage current under the condition of flame, and the leakage current under positive voltage is larger than that under negative polarity. When the burning intensity of vegetation in the gap increases, the gap breakdown voltage decreases significantly, and a relatively stable leakage current has been formed in the gap before the gap breakdown.
黄道春, 卢威, 姚涛, 夏军, 全万霖. 植被火条件下导线-板短空气间隙泄漏电流特性研究[J]. 电工技术学报, 2019, 34(16): 3487-3493.
Huang Daochun, Lu Wei, Yao Tao, Xia Jun, Quan Wanlin. Study on Leakage Current Characteristics of Conductor-Plane Short Air Gap under Vegetation Fire Condition. Transactions of China Electrotechnical Society, 2019, 34(16): 3487-3493.
[1] 何永秀, 朱茳, 罗涛, 等. 城市电网规划自然灾害风险评价研究[J]. 电工技术学报, 2011, 26(12): 205-210. He Yongxiu, Zhu Jiang, Luo Tao, et al.Risk assessment of natural disaster in urban electric power network planning[J]. Transactions of China Electro- technical Society, 2011, 26(12): 205-210. [2] 蒋兴良, 姜方义, 汪泉霖, 等. 基于最优时间步长模型的输电导线雾凇覆冰预测[J]. 电工技术学报, 2018, 33(18): 4408-4418. Jiang Xingliang, Jiang Fangyi, Wang Quanlin, et al.Prediction of rime accretion on transmission line based on optimal time step model[J]. Transactions of China Electrotechnical Society, 2018, 33(18): 4408-4418. [3] 周志宇, 艾欣, 陆佳政, 等. 山火灾害引发的输电线路跳闸风险实时分析方法及应用[J]. 中国电机工程学报, 2017, 37(18): 5321-5330. Zhou Zhiyu, Ai Xin, Lu Jiazheng, et al.A real-time analysis approach and its application for transmission-line trip risk due to wildfire disaster[J]. Proceedings of the CSEE, 2017, 37(18): 5321-5330. [4] 黎鹏, 阮江军, 黄道春, 等. 模拟山火条件下导线-板间隙击穿特性影响因素分析[J]. 电工技术学报, 2018, 33(1): 195-201. Li Peng, Ruan Jiangjun, Huang Daochun, et al.Influence factors analysis of the conductor-plane gap breakdown characteristic under simulation forest fire condition[J]. Transactions of China Electrotechnical Society, 2018, 33(1): 195-201. [5] 吴田, 胡毅, 阮江军, 等. 交流输电线路模型在山火条件下的击穿机理[J]. 高电压技术, 2011, 37(5): 1115-1122. Wu Tian, Hu Yi, Ruan Jiangjun, et al.Air gap breakdown mechanism of model AC transmission line under forest fires[J]. High Voltage Engineering, 2011, 37(5): 1115-1122. [6] 吴田, 阮江军, 胡毅, 等. 500kV输电线路的山火击穿特性及机制研究[J]. 中国电机工程学报, 2011, 31(34): 163-170. Wu Tian, Ruan Jiangjun, Hu Yi, et al.Study on forest fire induced breakdown characteristics and mechanism of 500kV transmission line[J]. Proceedings of the CSEE, 2011, 31(34): 163-170. [7] Kuffel E, Zaengl W S, Kuffel J.High voltage engineering: fundamentals[M]. 2nd ed. Oxford, UK: Newnes, 2000. [8] Uhm H S.Properties of plasmas generated by electrical breakdown in ?ames[J]. Physics of Plasmas, 1999, 6(11): 4366-4374. [9] Mphale K M, Heron M, Ketlhwaafetse R, et al.Interferometric measurement of ionization in a grassfire[J]. Meteorology and Atmospheric Physics, 2010, 106(3/4): 191-203. [10] Mphalea K M, Luhanga P V C, Heron M L. Microwave attenuation in forest fuel ?ames[J]. Combustion and Flame, 2008, 154(4): 728-739. [11] Mphalea K M, Heron M.Wildfire plume electrical conductivity[J]. Tellus Series B-Chemical and Physical Meteorology, 2007, 59(4): 766-772. [12] Pu Ziheng, Ruan Jiangjun, Huang Daochun, et al.Study on the breakdown characteristics of the transmission line gap under forest fire conditions[J]. International Transactions on Electrical Energy Systems, 2015, 25(11): 2731-2744. [13] Deno D W, Zaffanella L E.Flashovers caused by fires: transmission line reference book 345kV and above[M]. 2ed. California, USA: EPRI, 1987. [14] Zhang Xiaolei, Yang Weihong, Blasiak Wlodzimierz.Modeling study of woody biomass: interactions of cellulose, hemicellulose, and lignin[J]. Energy and Fuels, 2011, 25(10): 4786-4795. [15] 李坚. 木材科学[M]. 北京: 高等教育出版社, 2002. [16] Viegas D X.Forest fire propagation[J]. Philosophical Transactions of the Royal Society, 1988, 356(1748): 383-388. [17] 沈其工. 高电压绝缘基础[M]. 南京: 江苏科学技术出版社, 1990. [18] 王方. 火焰学[M]. 合肥: 中国科技大学出版社, 1994. [19] 龙明洋, 黄道春, 黎鹏, 等. 典型植被灰烬颗粒对导线-板间隙放电特性的影响[J]. 电工技术学报, 2018, 33(3): 627-633. Long Mingyang, Huang Daochun, Li Peng, et al.Influence of the typical vegetation ashes/particles on the discharge characteristics of conductor-plane air gap[J]. Transactions of China Electrotechnical Society, 2018, 33(3): 627-633. [20] 黄道春, 黎鹏, 阮江军, 等. 山火引发输电线路间隙放电机理与击穿特性综述[J]. 高电压技术, 2015, 41(2): 622-632. Huang Daochun, Li Peng, Ruan Jiangjun, et al.Review on discharge mechanism and breakdown characteristics of transmission line gap under forest fire condition[J]. High Voltage Engineering, 2015, 41(2): 622-632. [21] 秦知航, 黄道春, 黎鹏, 等. 考虑火焰对绝缘强度影响的植被燃烧研究[J]. 消防科学与技术, 2016, 35(1): 1-5. Qin Zhihang, Huang Daochun, Li Peng, et al.Com- bustion characteristics of typical vegetation considering the effects of flame on gap insulation strength[J]. Fire Science and Technology, 2016, 35(1): 1-5. [22] Li Peng, Huang Daochun, Pu Ziheng, et al.Study on DC voltage breakdown characteristics of gap under fire conditions[C]//2013 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Shenzhen, China, 2013: 338-341.
2019, Vol. 34 
