考虑导线弧垂的雷电感应电压计算与分析  

Calculation and Analysis of Lightning-induced Voltage Considering Conductor Sag

作　　者：刘欣[1] 岳慧清 LIU Xin;YUE Huiqing(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003

出　　处：《华北电力大学学报（自然科学版）》2019年第3期57-65,共9页Journal of North China Electric Power University：Natural Science Edition

基　　金：中央高校基本科研业务费专项基金资助项目(2017MS100);国家自然科学基金资助项目(51407073)

摘　　要：为了提高配电线路的安全可靠性并对线路防雷设计提供有价值的参考依据,基于非均匀传输线理论和Agrawal场线耦合模型,实现了一种用于求解非均匀多导体传输线场线耦合模型改进电报方程的单变量时域有限元(FETD)法,通过与双变量FETD法对比,验证该方法的正确性。针对典型35 k V架空配电线路,计算了不同大地电导率和雷击距离条件下考虑导线弧垂的雷电感应电压,并分析了弧垂对雷电感应电压的影响机理。结果表明实现线路雷电感应电压的准确计算需要计及弧垂的影响。此外,比较了考虑弧垂、电晕和架设地线对雷电感应电压的影响,进一步说明了考虑导线弧垂的必要性。To improve the safety and reliability of distribution lines and provide reference for lightning protection design,this paper derived a single variable finite-element time-domain method(FETD)for solving improved telegraph equation of field-to-line coupling model of non-uniform multi-conductor transmission line.FETD method is based on the non-uniform multi-conductor transmission line theory and Agrawal field-to-line coupling model and its accuracy is verified by comparing with the calculation results of the bivariate FETD method.For the typical 35 k V overhead distribution lines,FETD method calculated the lightning induced voltages considering the conductor sags under different ground conductivity and lightning distance,and it analyzed the influence mechanism of sags on lightning-induced voltage.The results showed that conductor sags have influence on the accurate calculation of lightning-induced voltage.Furthermore,this paper further explained the necessity of considering conductor sags through comparing the influence of sag,corona and ground line on lightning-induced voltage.

关 键 词：配电线路 雷电感应电压 单变量时域有限元法 非均匀多导体传输线 弧垂 

分 类 号：TM726[电气工程—电力系统及自动化]