500kV同塔四回输电线路雷电绕击特性研究  

Research on Shielding Failure Characteristics of 500 kV Mono-tower Quadruple-circuit Transmission Lines

作　　者：赵会龙 柏彬 茅鑫同 刘巍 刘志伟 ZHAO Huilong;BAI Bin;MAO Xintong;LIU Wei;LIU Zhiwei(State Grid Jiangsu Electric Power Co.,Ltd.,Construction Branch,Nanjing 210000,China)

机构地区：[1]国网江苏省电力有限公司建设分公司,江苏南京210000

出　　处：《电工技术》2023年第19期164-168,共5页Electric Engineering

基　　金：国家电网有限公司科技项目(编号SGJSJSOOXMJS2200171)。

摘　　要：采用改进电气几何模型,在计及雷电入射角、不等高悬挂、导线之间相互屏蔽作用的影响下,分析了500 kV同塔四回输电线路的雷电绕击特性。研究发现,直线塔各层导线中第三层导线的雷击风险最大,第二层、第五层和第四层导线的绕击跳闸率依次降低,第一层和第六层导线的绕击风险接近于零。随着地线横担宽度的增加,第二层导线的绕击跳闸率显著减小,而其他导线没有明显影响。随着绝缘子片数的增加,各层导线的绕击跳闸率都显著减小,输电线路综合绕击跳闸率也减小。In order to investigate the shielding failure characteristics of multi-circuit transmission lines,an improved electrical geometry model(EGM) is constructed,which takes into account the influences of lightning incident angle,unequal height suspension,and inter-conductor shielding,and which is used to analyze the shielding failure characteristics of 500 kV mono-tower quadruple-circuit transmission lines.It is found that the shielding failure rate of the third layer of wires is the greatest,followed in turn by the second,the fifth and the fourth layers.The shielding failure risk of the first and sixth layers of wires is close to zero.With the increase of the cross arm width of the ground wire,the tripping rate of the second layer wires decreases significantly,but there is no obvious effect on other layers.When the number of insulators increases,the tripping rate of each layer of wires decreases significantly,and so does the comprehensive tripping rate of transmission line.

关 键 词：绕击特性 电气几何模型 同塔四回输电线路 

分 类 号：TM866[电气工程—高电压与绝缘技术]