摘要
为了研究地形地貌对330 k V同塔双回输电线路最大绕击电流的影响,选取了三种典型的330 k V双回线路杆塔,利用电磁场数值分析和几何分析方法,分析了杆塔各导线间的相互屏蔽,拓展了电气几何模型EGM,计算了不同地形地貌下各相导线的最大绕击电流值Imax。分析得出同塔双回各导线的受屏蔽效果及地形地貌对最大绕击电流的影响。分析结果表明:对于鼓形塔,上相导线主要受地线和中相导线屏蔽;中相导线主要受地线和大地屏蔽;下相导线主要受中相导线和大地屏蔽。随着地面倾角的增大,地面对导线的屏蔽作用越强,导线的最大绕击电流逐渐减小。
In order to study on the influence of topography to maximum shielding current of 330 kV double-circuit transmission line,three typical 330 kV towers with double-circuit are selected to analyse mutual shielding between wires,to expand Electrical geometry model（EGM）, and to calculate maximum shielding current Imax of wires in different topography, with electromagnetic numerical analysis method and geometric analysis method. Finally ,the shielding effect of conductors in double-circuits and the influence of topography to maximum shielding current are obtained. Results of the analysis show that, to the drum-shaped tower,the uppermost phase wires are shielded by ground wire and middle phase wires; the middle phase wires are shielded by ground wire and the earth; the lowermost phase wires are shielded by middle phase wires and the earth. With the increase of ground tilt, the shielding effect of the ground plane is enhancing, the maximum shielding current of wires is minimizing.
出处
《电瓷避雷器》
CAS
北大核心
2014年第5期71-75,共5页
Insulators and Surge Arresters
关键词
地形地貌
同塔双回线路
最大绕击电流
屏蔽
EGM
topography
double-circuit transmission line
maximum shielding current
shield
EGM
