摘要
由于我国地少人多,土地资源紧缺,导致可用的线路走廊减少,形成了一些线路排列紧密的输电通道。输电通道某区段内存在两条或多条输电线路紧密排列,通道内两线路间雷电屏蔽特性与单条线路运行存在差异。本文针对500 k V交流输电通道,建立两条线路并行架设时的EGM模型,重点研究考虑两邻近线路雷电屏蔽后输电线路绕击性能变化情况。研究两线路不同间距、不同邻近线路高度以及不同地面倾角下各相导线绕击次数变化情况,并引入雷电屏蔽因子,直观描述两线路间的雷电屏蔽特性。研究结果表明,两线路间距、邻近线路高度以及地面倾角对邻近线路间雷电屏蔽特性存在重要影响,两线路间距越小,内侧导线所受的雷电屏蔽效应越强;邻近线路高度越高,雷电屏蔽效应越强。在实际工程建设中,可通过配合好两邻近线路的线路间距、邻近线路高度以及地面倾角,利用两线路间的雷电屏蔽特性,保护两邻近线路内侧导线,提高线路防雷能力。
In recent years,with the development of the power grid and the shortage of land resources in China,the available line corridors are decreased. Therefore,some important transmission channels with closely arranged lines have been formed. Two or more transmission lines may be closely arranged in the channel. There are differences in the lightning shielding characteristics between the adjacent lines in the transmission channel and the general lines. An EGM model considering two parallel lines is established for 500 kV AC transmission channel. The change of the shielding failure rate of the transmission line considering the lightning shielding characteristics of two adjacent lines is studied especially. The research on the shielding failure rate of two parallel lines under the different distance,the different height and the influence of slope angle is fully done,and it introduces the lightning shielding factor Sf,which is a better description of the lightning shielding characteristics. The results show that the distance between the two lines,the height of the adjacent line and the slope angle have an important influence on the lightning shielding characteristics. The closer two adjacent lines is,the smaller shielding failure rate of the inner side lines is. In construction,it is recommended to match the distance between the two adjacent lines,and use the height of adjacent line and the slope angle,to protect the inner side conductors by using the lightning shielding characteristics.
作者
王韬
赵乐冰
吴敏
赵淳
郭均天
王佩
孙泽中
邓冶强
王羽
WANG Tao;ZHAO Lebing;WU Ming;ZHAO Chun;GUO Juntian;WANG Pei;SUN Zezhong;DENG Yeqiang;WANG Yu(Wuhan NARI Limited Company of State Grid Electric Power Research Institute,Wuhan 430074,China;Hohai University,Nanjing 211100,China;School of Electrical Engineering,Wuhan University,Wuhan 430072,China)
出处
《电瓷避雷器》
CAS
北大核心
2020年第5期7-14,共8页
Insulators and Surge Arresters
基金
国家自然科学基金项目(编号:51777037)
国家电网公司科技指南项目(编号:524625180018)。
关键词
电气几何模型
雷电屏蔽
绕击次数
输电通道
500
kV线路
electro geometric model
lightning shielding
shielding failure rate
transmission channel
500 kV AC transmission line
作者简介
王韬(1987-),男,高级工程师,硕士,从事电网雷害风险评估技术、输电线路差异化防雷技术及配网物资质量检测等方面的研究工作。
