邻近线路对±1100kV直流线路雷电屏蔽效果影响计算研究  

Calculation Research on Influence of Adjacent Lines on Lightning Shielding Failure of ±1100 kV DC Transmission Line

作　　者：文习山[1] 邓冶强 王磊[2] 何慧雯[2] 王羽[1] 孙泽中 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072 [2]中国电力科学研究院,湖北省武汉市430072

出　　处：《电网技术》2017年第11期3420-3426,共7页Power System Technology

基　　金：国家重点研发计划项目(2016YFB0900801)(±1100 kV直流工程过电压抑制与绝缘配合及雷电防护技术研究)~~

摘　　要：由于土地资源紧缺,±1100 kV特高压直流工程的输电通道某区段内,可能存在2条或多条输电线路同走廊架设的问题。运行经验表明:直流输电线路由于极性效应,其雷电屏蔽特性相对交流输电线路存在一定的规律性。为研究临近线路对±1100 kV直流线路绕击特性的影响规律,探寻直流线路极性以及邻近线路高度、间距等布置方式的影响,以达到最经济有效的防雷方案。基于电气几何模型,搭建考虑±1100kV线路和其他线路并行排列下的雷电屏蔽仿真模型,计算考虑屏蔽后的±1100 kV线路各相导线的绕击次数,并引入雷电屏蔽因子,对邻近输电线路对±1100 kV线路的屏蔽效果进行定量的分析。研究结果表明±1100 kV线路正负极性位置、邻近线路杆塔结构(单回或双回)、邻近杆塔高度以及间距等因素对靠近邻近线路侧的±1100 kV直流线路导线的雷电屏蔽特性有较大的影响。在±1100 kV直流工程建设中,建议正极性导线布置在靠近邻近线路侧,可降低±1100 kV线路绕击概率。当与邻近线路间隔较近时,±1100 kV线路绕击概率大幅降低,可考虑减少防绕击的措施,节省经济成本。Due to shortage of land resources in China,there may be two or more transmission lines in sections of a transmission channel of ±1100 kV UHV DC project.Operation experience shows that due to polarity effect,lightning shielding characteristics of DC transmission lines have certain regularity comparing with AC transmission line.In order to study influence of adjacent lines on lightning shielding characteristics of ±1100 kV DC lines,this paper explores influence of different arrangement of polarity,height of adjacent lines and separation distance,et al to achieve the most cost-effective lightning protection scheme.In this paper,based on electrical geometric model,a lightning shielding simulation model with a ±1100 kV line and other lines in parallel was built to calculate conductor striking frequency.Lighting shielding factor was introduced to quantitatively analyze effect of adjacent lines on ±1100 kV line shielding.It was found that there existed remarkable influence of polarity,tower structure（single-or double-circuit transmission lines）,tower height and separation distance on lightning shielding characteristics.In construction of ±1100 kV DC project,it is recommended that the positive polarity conductor should be arranged near the adjacent line side,thus reducing lightning shielding failure rate of ±1100 kV line.When the distance to adjacent lines is close,the lightning shielding failure rate of ±1100 kV line is greatly reduced,and it can be considered to simplify measures against shielding failure to cut costs.

关 键 词：±1100 KV 特高压直流 电气几何模型 绕击 雷电屏蔽因子 

分 类 号：TM86[电气工程—高电压与绝缘技术]