高压直流输电线路电场强度计算方法

针对高压直流输电线路产生的电场问题，考虑分裂导线的作用，改进了Sarma计算电场强度的方法.计算了电场强度的分布，并分析了线路设计参数对电场强度分布的影响.研究表明，地面电场强度在中心点为零，向两侧极导线方向迅速增加，在极导线外侧1~3 m处达到最大值，而后随距离增加而急剧衰减.导线高度对电场强度的分布影响最为明显，导线越高，电场强度越小;次导线半径越大，电场强度越小;极间距越小，电场强度越小;次导线分裂间距和次导线布置形式对电场强度的影响很小.

Calculation of electric field intensity of high voltage direct current transmission lines

The analytical method proposed by Sarma was improved by introducing bundled conductors to calculate electric field intensity generated by high voltage direct current(HVDC) transmission lines.The distribution of electric field intensity was calculated and the influences of conductor configuration on electric field intensity were analyzed.Results show that the electric field intensity changes from zero at the midpoint projection of transmission lines on the ground to the maximum value at a 1~3 m lateral distance of the polar lines,after that the electric field intensity decreases rapidly with distance.The height of the polar lines has a remarkable influence on electric field intensity.Higher polar lines,larger sub-conductors radius,and smaller distance between the polar lines lead to weaker electric field intensity.The layout and spacing between sub-conductors have little influence on the magnitude of electric field intensity.