屏蔽线（网）不同的架设方式改善架空输电线路工频电场分布研究

Study on Improvement of Power Frequency Electric Field Distribution of Overhead Transmission Lines by Different Ways of Shield Wire(Network)

为改善架空输电线路下方工频电场分布,在线路下方架设屏蔽线或屏蔽网。基于CDEGS软件建立高压架空输电线路工频电场三维仿真计算模型,研究架设屏蔽线和屏蔽网改善高压输电线路下方工频电场的效果,分析讨论屏蔽线架设高度、横向位置、根数以及屏蔽网网格数等对线路下方及表面工频电场影响的规律和特征。结果表明:架设屏蔽线能够有效改善导线下方空间工频电场;屏蔽线架设高度、距线路中心的水平距离对屏蔽效果影响明显,存在最佳布置位置;屏蔽线间距对其屏蔽效果有一定影响;屏蔽线根数越多,效果越好,但逐渐趋于平缓;架设屏蔽网的效果比屏蔽线更明显,屏蔽网格数越多,屏蔽效果越明显。

In order to improve the distribution of power frequency electric field under overhead transmission line,shield wire or shield network is set up under the line.Based on CDEGS software,a three-dimensional simulation model of power frequency electric field of high-voltage overhead transmission line is established,and the effect of erecting shield wire and shield network to improve power frequency electric field under high-voltage transmission line is studied.This paper analyzes and discusses the rules and characteristics of the influence of the height of shield wire,the horizontal position,the number of shield wire and the number of shield grid on the power frequency electric field under and on the surface of the line.The results show that the shield wire can effectively improve the power frequency electric field under the conductor.The height of the shield wire and the horizontal distance from the center of the line have obvious influence on the shielding effect,and there is the best layout position.The distance between shield wires has a certain influence on its shielding effect.The more number of shield wires,the better the effect,but gradually tends to be gentle.The effect of setting up Shield network is more obvious than that of shield wire.The more number of shield grid,the more obvious shielding effect.