架空输电线路超高树木临近时电场分布特征研究

Study on Distribution Characteristics of Electric Field Around Super High Trees Under Overhead Transmission Lines

架空输电线路下方存在树木十分常见,树木自然生长临近输电线路时,树木顶端可能会发生电晕灼烧现象,甚至会发生与输电线路间的闪络。为了保护线路和树木安全,通过仿真计算分析研究树木周围电场强度和影响因素是很有必要的。对不同树冠形状树木进行有限元分析,建立三维输电线路和树木模型,分析在110kV三相线路电场叠加下树木顶端附近电场分布情况,讨论了不同树冠形状、树木高度、树木位置、电源相角下树木周围合成电场分布规律。

It is very common to have trees below the overhead transmission line.When the trees grow naturally near the transmission line,corona burning may occur at the top of the tree,and even flashovers may occur between the transmission lines.In order to protect the safety of lines and trees,it is necessary to study and analyze the electric field strength around the trees and the influencing factors through simulation calculation.The finite element analysis of trees with different crown shapes is carried out to establish a three-dimensional transmission line and tree model.The electric field distribution near the top of the tree under the electric field superposition of 110 kV three-phase line is analyzed.The distribution of synthetic electric fields around trees with different crown shapes,tree heights,tree positions and power phase angles are discussed.