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| 500kV输电线路的山火击穿特性及机制研究 | |
| 引用本文： | 吴田,阮江军,胡毅,刘兵,陈成.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). |
| 作者姓名： | 吴田 阮江军 胡毅 刘兵 陈成 |
| 作者单位： | 1. 武汉大学电气工程学院,湖北省武汉市,430072 2. 国网电力科学研究院,湖北省武汉市,430074 3. 华中电网有限公司,湖北省武汉市,430077 |
| 基金项目： | 国家电网公司重大科技项目(SGKJJSKF20090567)~~ |
| 摘 要： | 近年来中国森林火灾频繁发生,严重威胁到输电线路的绝缘安全和可靠运行。结合500kV输电线路山火事故录像以及棒-板间隙在木垛火条件下的放电特性,分析了500 kV输电线路在山火条件下的击穿特性和机制。结果表明：1）火焰的绝缘电阻随火焰高度的增加而增大;2）在木垛火焰条件下,棒-板间隙的工频击穿强度降低为纯空气间隙下的23%;3）火焰温度、火焰电导率和颗粒等能够促进放电的发展,并导致间隙的绝缘水平下降;4）导线对火焰顶部的预放电能促进燃烧,电弧则能够增强山火燃烧的强度并抬升火焰的高度,导致击穿电压降低。由试验与分析可知,输电线路因山火击穿是由火焰温度、电导率以及灰烬与烟雾等3个因素促进放电发展的结果,并指出提升导线高度,控制线路走廊附近的植被种类、高度和密度能够有效地提高线路在山火条件下的绝缘水平。 |
| 关 键 词： | 超高压 输电线路 山火击穿 外绝缘 |
Study on Forest Fire Induced Breakdown of 500kV Transmission Line in Terms of Characteristics and Mechanism |
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| WU Tian,RUAN Jiangjun,HU Yi,LIU Bing,CHEN Cheng.Study on Forest Fire Induced Breakdown of 500kV Transmission Line in Terms of Characteristics and Mechanism[J].Proceedings of the CSEE,2011,31(34). | |
| Authors: | WU Tian RUAN Jiangjun HU Yi LIU Bing CHEN Cheng |
| Affiliation: | WU Tian1,RUAN Jiangjun1,HU Yi2,LIU Bing3,CHEN Cheng1(1.School of Electrical Engineering,Wuhan University,Wuhan 430072,Hubei Province,China,2.State Grid Electric Power Research Institute,Wuhan 430074,3.Central China Grid Company Limited,Wuhan 430077,China) |
| Abstract: | Forest fires near power transmission lines always threaten the reliability of transmission lines and safety of power grids.Combining video record of the 500kV transmission line fire induced flashover and breakdown characteristics of rod-plane gap under wood crib fires,the flashover mechanism of 500kV line under forest fires was investigated.Results are as follows: the dielectric resistance increases with the height of flame due to temperature that affects the thermal ionization of alkali mental salts;the br... |
| Keywords: | extra high voltage(EHV) transmission lines fire induced flashover external insulation |
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