交叉跨越输电导线三维工频电磁场计算  

Accurate Calculation of Three-dimensional Power Frequency Electromagnetic Field for Space Crossed Transmission Line

作　　者：陈楠[1] 文习山[1] 蓝磊[1] 罗杰 李晔 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]株洲电业局,株洲412000 [3]宁夏电力科学研究院,银川750002

出　　处：《高电压技术》2011年第7期1752-1759,共8页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724500)~~

摘　　要：为了研究交叉跨越导线周围的工频电磁场分布,考虑导线弧垂和杆塔,根据悬链线方程建立了三相交叉跨越导线的三维电磁场计算模型。基于模拟电荷法,利用线性变化的有限长线电荷模拟输电导线轴向电荷分布,计算交叉导线下方产生的工频电场。基于毕奥—萨瓦定律,采用有限长载流细导线模型计算交叉导线下方产生的工频磁场。计算分析了交叉角度和导线相序对电磁场分布的影响规律,结果表明:随着交叉角增大,导线下方电磁场逐渐减小;改变导线相序电磁场最大值基本不变;电场强度最大值出现在同相导线投影交叉点位置附近,工频磁场最大值出现在跨越导线中相与被跨导线边相投影交叉处,实际工程中应予以注意;此外,交叉线路下方被跨越导线对交叉导线的电场有屏蔽作用,对磁场则与交叉角度有关。最后对银川地区两条典型交叉输电导线进行了现场测量,验证了算法的有效性。In order to investigate the power frequency electromagnetic field distribution of transmission line crossed in space, a three-dimensional electromagnetic field calculation model of three-phase cross-wire was established according to the catenary equation and considering conductor sag and tower. Based on the charge simulation method, the power frequency electrical field below the cross-wire was calculated, utilizing linear finite slant line charges to simulate the axial charge distribution in wire. Based on the Biot-Savart theorem, the power frequency magnetic field below the cross-wire was calculated by finite thin current-carrying wire model. Meanwhile, the influence law of crossing angle and line-phase on field distribution was discussed. The calculation results show that the electromagnetic field below the cross-wire decreases with the crossing angle getting larger, and the field distribution changes with line-phase altered; the maximum electrical field occurs near the projection of the same phase cross-wire intersection, and the maximum magnetic field occurs near the projection of the intersection of middle phase of the top wire and side phase of the lower wire. Besides, the wire at the bottom plays a shield wire role in electrical field, however, for magnetic field, the role is related with crossing angle. In the end, the electromagnetic field is surveyed on the spots for two typical crossed wires in YinChuan area, and the availability of the algorithm is validated.

关 键 词：输电导线 交叉跨越 工频电场 工频磁场 模拟电荷法 毕奥-萨瓦定律 测量 

分 类 号：TM154.1[电气工程—电工理论与新技术]