极导线垂直排列直流线路地面合成电场的一种计算方法

极导线垂直排列直流线路在我国已用于实际工程，有必要研究有效方法计算该类线路的合成电场，以满足工程设计和环境保护需求。根据极导线垂直排列直流线路几何结构的特点，在Deutsch假设的基础上，提出了一种计算极导线垂直排列直流线路地面合成电场的方法。该方法还适用于极导线水平排列直流线路。通过试验和计算结果对比，对该方法进行了验证。使用该法对极导线垂直和水平排列±500kV直流线路的地面合成电场进行了计算分析。结果表明：在极导线高度和极间距分别相同的情况下，极导线垂直排列直流线路下的最大地面合成电场比极导线水平排列直流线路的略大，但极导线垂直排列直流线路的地面合成电场横向衰减较快；极导线垂直排列直流线路的走廊宽度约为极导线水平排列线路的50%。

A Calculation Method for the Total Electric Field Strength at the Ground Level Under Vertical Bipolar HVDC Transmission Lines

The vertical bipolar HVDC transmission line has been applied to actual engineering in china, so it is necessary to study the valid calculation method for the total electric field strength of this type of lines in order to satisfy the requirements of engineering design and environment protection. According to the geometry configuration characters of vertical bipolar HVDC transmission lines, a calculation method based on the Deutsch assumption for the total electric field strength at the ground level under vertical bipolar HVDC transmission lines is presented. The calculation method is also suitable for horizontal bipolar HVDC transmission lines. The calculation method is validated through comparing calculation results with measurement results. The total electric field strength at the ground level under vertical and horizontal ±500kV DC transmission lines is calculated and analyzed by using the method. The results are shown as following. For the same line height and the same pole spacing, the maximal value of the total electric field strength at the ground level under vertical lines is slightly larger than that under horizontal lines, but the total electric field strength at the ground level under the former decreases more rapidly than that under the latter with the increase of the distance from the center of lines, and the corridor width of the former approximately equals half of that of the latter.