高压直流输电线下空间电荷与电场的关系研究

为了分析高压直流输电线下空间电荷与电场两个电磁环境指标之间的联系,采用Sarma法对单极直流线路下的空间电荷密度和标称场强分布进行数值计算。利用空间电荷密度测量设备,在高压直流输电线路下方进行实际测试,分析一些线路参数对空间电荷密度与标称场强分布规律的影响。结果表明:高压直流输电线路周围的空间电荷密度和标称电场具有相似的变化规律,提高导线高度能明显减小空间电荷密度和电场强度,导线极间距和分裂数的小范围变化对空间电荷密度与地面电场影响不大,大气质量是影响空间电荷密度和电场强度大小的重要因素。

Research on the Relationship between Space Charge and Electric Field under High Voltage Direct Current Transmission Line

In order to analyze the connection between space charge and electric field under high voltage direct current transmission line, Sarma method is used for numerical calculation to analyze the connection between space charge density and electric field under unipolar direct current lines. On the basis of space charge density measuring device, the data is tested under the actual line. The influence of distribution law is studied for some circuit parameters of space charge density and electric field. The results show that space charge density and electric field has a similar change rule. Increasing the height can reduce the space charge density and electric field obviously, but line spacing and split number have little influence on them. Air quality is an important factor to affect the size of the space charge density and total electric field.