复杂地形条件下超高压错层塔上坡位上相绕击跳闸率计算  

Calculation the Shielding Failure Flashover Rate of the Upper Phase on the Uphill Side of the Unequal Height Tower in the EHV Transmission Line in the Complex Terrain Area

作　　者：李新 武利会 范心明 董镝 邱太洪 宋安琪 汪颖[2] 陈春林 LI Xin;WU Lihui;FAN Xinming;DONG Di;QIU Taihong;SONG Anqi;WANG Ying;CHEN Chunlin(Guangdong Power Grid Company of Limited Liability Foshan Power Supply Bureau,Foshan 528000,China;College of Electrical Engineering and Information Technology,Sichuan University,Chengdu 610065,China)

机构地区：[1]广东电网有限责任公司佛山供电局,广东佛山528000 [2]四川大学电气信息学院,成都610065

出　　处：《电瓷避雷器》2020年第5期60-67,共8页Insulators and Surge Arresters

基　　金：南方电网科技项目资助(编号:GDKJXM20172832)。

摘　　要：绕击跳闸是威胁超高压输电线路安全稳定运行的最主要的原因。对于同塔双回输电线路,主要研究横担最长的下坡位中相导线的绕击跳闸率,但实际运行经验不乏上相导线受雷击跳闸的案例。基于电气几何法,本文提出一种针对复杂地形下的超高压输电线路错层塔上坡位上相导线的雷击绕击率计算方法。分析了错层塔上坡位上相导线受雷击的风险,从该相挂点的左右两侧分别建立模型,提出34种可能的暴露弧投影情况,能全面地考虑该相导线的绕击率。结合现代地理信息软件,能够较准确地计算该相的绕击跳闸率。以某设计阶段的500 kV输电线路错层塔为例,应用本方法对两种不同设计方案的雷击跳闸率进行对比。计算结果表明,错层塔上坡位上相可能面临较大雷击风险,应用本文方法能对错层塔的设计和防雷保护措施提出理论建议。Shielding failure is the most important reason to threaten the safe and stable operation of EHV transmission line. The shielding failure flashover rate( SFFR) of middle phase conductor,which is with the longest cross arm among the three phases,on the downhill side is usually calculated. However the upper phase,which is not calculated,may be flashover in the operation. The author proposes a method to calculate SFFR of upper phase on the uphill side for the unequal height tower in the complex terrain area,based on EGM. The author also researches on the shielding failure risk of the upper phase on the uphill side for the unequal height tower,builds the model for the left side and right side of the upper phase,presents 34 kinds of situation of the projection of exposed surface. The method can calculate SFFR with full consideration of the situations. Equipped with the geographic information software,it is possible to calculate SFFR of the upper phase accurately. An unequal height tower of one 500 kV transmission line in design stage is as the case study in this paper,which is calculated SFFR with the proposed method by considering two schemes. The calculation result shows that the upper phase on the uphill side of the unequal height tower may face the risk of flashover. Using the proposed method can give the theoretical suggestion for the tower design and lightning protection measures.

关 键 词：输电线路 绕击 电气几何模型 错层塔 雷击跳闸率 

分 类 号：TM863[电气工程—高电压与绝缘技术]